Rotating Punch Ejector for Continuous Rubber Strip Sampling
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Solution Overview
Problem
Current automatic sampling systems for rubber strips fail to ensure efficient and continuous sampling without stopping the conveyance, particularly when dealing with tacky samples or thin strips, leading to issues like sample adhesion and ejector jamming, which affects the success rate and transfer efficiency.
Innovation Solution
An automatic sampling system with a rotating punch and ejector mechanism that includes a die-cutter with an annular blade, a domed surface for sample release, and a piston-actuated ejector with a hook for secure sample engagement and release, allowing continuous sampling without stopping the rubber strip's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a known automatic sampling system with a flat ejector surface is used, then the sampling can be performed automatically without stopping conveyance, but the tacky samples adhere to the ejector surface causing jamming and reducing reliability
Solution Approach 1:
The ejector surface is changed from flat to domed (curved). This curvature prevents tacky rubber samples from adhering to the surface, allowing samples to be easily released after cutting. The domed shape ensures that samples do not stick during the ejection process, thereby preventing jamming and improving the reliability of continuous automatic sampling.
2Manufacturing precision
If the rubber strip conveyance is slowed down or stopped for sampling, then samples can be taken more accurately, but productivity decreases
Solution Approach 1:
The sampling system is designed to perform the cutting and sample collection actions in advance while the rubber strip is still moving at normal speed. The rotating punch with pre-positioned die-cutter and ejector mechanism captures samples during continuous conveyance, eliminating the need to slow down or stop the production line, thus maintaining both accuracy and productivity.
Solution Approach 2:
The sampling system uses a rotating punch mechanism that dynamically adapts to the moving rubber strip. The punch rotates in sync with the conveyance speed, and the ejector is actuated at the precise moment when the die-cutter engages the strip, allowing accurate sampling without interrupting the continuous motion of the rubber strip.
3Productivity
If a rotating punch with domed ejector surface is used, then continuous sampling without stopping conveyance is achieved, but the device complexity increases
Solution Approach 1:
The die-cutter and ejector are integrated into a single rotating punch assembly. This combined structure performs both cutting and sample ejection functions in one rotational cycle, eliminating the need for separate mechanisms and reducing overall system complexity while maintaining continuous sampling capability.
Solution Approach 2:
The rotating punch serves multiple functions: it holds the die-cutter for cutting samples, provides the domed ejector surface for sample release, and acts as the mounting structure for the entire sampling mechanism. This multi-functional design reduces the number of separate components needed, simplifying the overall device while enabling continuous operation.
Data Source
AI summary
An automatic sampling system (100) and an automated sampling method take samples of a rubber strip after shaping and while scrolling in a predetermined direction.