Pneumatic Hammer Core Removal with Rotary Valve
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Solution Overview
Problem
Existing methods for decoring cast workpieces, such as those using percussion mechanisms, fail to achieve optimal energy transfer to shatter the core, limiting the effectiveness of the process.
Innovation Solution
A device with a pneumatic hammer system equipped with a rotary valve actuator allows for adjustable and defined impact frequency, enabling precise control over energy transfer by alternately connecting areas of the working cylinder to the compressor, reducing mechanical load and enhancing energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a pneumatic hammer is used for core removal, then energy transfer to shatter the core is improved, but mechanical stress on the valve increases
Solution Approach 1:
The patent applies dynamics by making the valve rotational rather than stationary, allowing it to dynamically switch between different connection configurations. The rotary valve rotates to alternately connect different areas of the working cylinder to the compressor, reducing mechanical stress while maintaining effective energy transfer for core shattering.
Solution Approach 2:
The patent implements periodic action through the rotary valve that periodically switches between connecting different cylinder areas to the compressor. This periodic switching creates alternating pressure zones that drive the piston back and forth, enabling continuous hammering action with reduced stress on individual valve components.
2Productivity
If impact frequency is increased to improve core shattering, then productivity is improved, but energy consumption increases
Solution Approach 1:
The rotary valve enables periodic connection and disconnection of compressor areas to the working cylinder, creating rhythmic pressure cycles that drive the piston at controlled frequencies. This periodic action allows optimization of impact frequency to match the core shattering requirements without excessive energy consumption.
Solution Approach 2:
The patent changes the parameter of pressure distribution by using the rotary valve to alternately connect different areas of the working cylinder to the compressor. This parameter change allows adjustment of the impact frequency and energy delivery to optimize both productivity and energy efficiency.
3Device complexity
If a stationary hammer system is used, then device complexity is reduced, but adaptability for different impact frequencies is limited
Solution Approach 1:
The patent introduces dynamics by replacing a stationary hammer system with a rotary valve mechanism that can dynamically adjust the connection configuration. This dynamic element provides adaptability for different impact frequencies while maintaining relatively simple device architecture through the use of a single rotating component.
Solution Approach 2:
The rotary valve serves multiple functions: it controls pressure distribution, adjusts impact frequency, and regulates energy transfer to the core. This multi-functionality provides adaptability for different operating conditions without requiring multiple separate control systems, thus maintaining device simplicity.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a device (1) for removing the core from a cast workpiece, said device (1) having at least one hammer (2, 3, 4), wherein the device (1) has at least one adjusting means (5, 6) for setting a striking frequency for the at least one hammer (2, 3, 4).