Pneumatic Percussion Tool Buffer Wear Detection
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Solution Overview
Problem
Pneumatic percussion tools used for demolition tasks face issues with buffer wear, leading to costly internal damage when operators forget to replace the buffer, as it is difficult to determine when the buffer has reached an unacceptable degree of wear, especially during backhammering.
Innovation Solution
A pneumatic percussion tool design that automatically stops operation when the buffer reaches a predetermined degree of wear and includes a visible wear indicator, ensuring the operator is alerted to replace the buffer, preventing damage to the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the buffer is replaced manually by the operator, then the tool can continue operating, but the operator may forget to replace the buffer leading to internal damage
Solution Approach 1:
The tool automatically monitors buffer wear and stops operation when the buffer reaches predetermined wear levels, eliminating the need for operator intervention to prevent damage. The system serves itself by detecting wear conditions and taking corrective action without human involvement.
Solution Approach 2:
The tool provides visual feedback to the operator through indicators that show the buffer wear status. When the buffer reaches critical wear levels, the indicator becomes visible, providing immediate feedback that prompts the operator to replace the buffer before damage occurs.
2Reliability
If the buffer wears down rapidly during backhammering, then the tool stops automatically, but the operator cannot know when replacement is needed
Solution Approach 1:
The tool uses visual indicators that change appearance (become visible) when the buffer reaches predetermined wear levels. This color/visibility change provides clear information to the operator about the buffer status without requiring complex displays or readings.
3Productivity
If the tool continues operating with a worn buffer, then productivity is maintained, but internal damage occurs requiring costly repairs
Solution Approach 1:
The tool provides continuous feedback about buffer wear status through visual indicators, allowing the operator to monitor condition and replace the buffer at appropriate intervals, balancing productivity with preventing damage.
Solution Approach 2:
The tool automatically stops operation before internal damage can occur by detecting buffer wear at predetermined levels. This preliminary action prevents the harmful effect of damage while allowing continuous operation during the buffer's service life.
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 the risk of internal damage to the percussion tool by automatically stopping operation and providing a visible wear indicator, allowing for timely buffer replacement and preventing costly repairs.
Implementation Method 1
The percussion tool has an interchangeable insert tool and can be adapted to a number of different application fields by replacing the tool. The percussion tool comprises a buffer to absorb the impact energy that is riot transmitted to the work site.
Implementation Method 2
The buffer wears down successively during use of the percussion tool and has to be replaced when it reaches a certain degree of wear. Another purpose is to achieve a visible indication to the operator that the predetermined degree of wear has been reached.
Data Source
Figure 1~3
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Figure 6~7
AI summary
A pneumatic percussion tool (1) for demolition and/or breaking work in for example concrete and connectable to an insert tool (2). The percussion tool has a percussion cylinder (4), a piston (5), arranged to travel in the bore of the cylinder (4), a buffer (8), and a valve unit (6), designed to act on the piston (5) during operation and produce a repetitive reciprocating travel in the bore of the cylinder (4) by alternately applying pressure to the upper or lower end of the cylinder (4) while the insert tool (2) is subject to influence by the stroke of the piston (5) when this is at its dead centre at the lower end of the cylinder (4). The percussion tool comprises a means (11) of preventing the piston's reciprocating motion when the buffer (8) reaches a predetermined degree of wear and the tool is not pressed against any object being worked.