Linear Guideway End Cap Force Sensor for Ball Circulation Detection
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Solution Overview
Problem
Traditional linear guideways face challenges in accurately detecting abnormal circulation states due to the rigidity of end caps and the need for precise sensor placement, which complicates real-time monitoring of smooth ball motion.
Innovation Solution
The linear guideway incorporates a rail, slider, and end caps with integrated and multi-piece structures, along with force sensors between the circulation member and seal sheet of the second end cap, allowing for real-time detection of abnormal circulation states by sensing the impact force of the balls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are employed to sense the variation of the force between the end caps and the slider, then the abnormal circulation state can be detected, but the detection accuracy is reduced due to the rigidity of end caps and the complexity of sensor placement
Solution Approach 1:
The second end cap is divided into multiple components: cap body, circulation member, and seal sheet. The force sensor is specifically placed between the circulation member and seal sheet, allowing localized measurement of impact forces without being affected by the overall rigidity of the end cap structure. This segmentation enables precise detection of ball circulation abnormalities.
Solution Approach 2:
The circulation member acts as an intermediary element between the balls and the force sensor. When balls impact the circulation member, the force is transmitted through this intermediary to the sensor, which is positioned between the circulation member and seal sheet. This intermediary structure amplifies and localizes the impact force for accurate sensing.
2Reliability
If the sensor is disposed outside the end cap to detect over-expansion contact, then the abnormality can be determined, but the sensor installation requires precise adjustment at a specific position
Solution Approach 1:
The end cap is segmented into cap body, circulation member, and seal sheet, with the force sensor positioned between the circulation member and seal sheet. This internal placement eliminates the need for external sensor positioning and precise adjustment, as the sensor is naturally positioned within the assembled structure.
Solution Approach 2:
The force sensor is integrated into the end cap assembly structure itself, where it automatically detects impact forces during normal operation. The circulation member's movement and the ball impacts naturally activate the sensor without requiring external positioning or 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 configuration enables accurate and real-time determination of abnormal circulation states by magnifying the impact force received by the second end cap, improving detection accuracy compared to prior arts.
Implementation Method 1
The force sensor is disposed between the circulation member of the second end cap and the seal sheet of the second end cap for sensing the force-receiving state of the second end cap when the second end cap is impacted by the balls.
Data Source
AI summary
A linear guideway includes a rail, a slider disposed on the rail, and a load passage formed between the rail and the slider. The slider has two non-load passages. Besides, a first end cap and a second end cap are disposed on two opposite end surfaces of the slider respectively. The first end cap has two first circulation grooves. The second end cap has a circulation member and a seal sheet. The circulation member has two second circulation grooves. The load passage, non-load passage, first circulation groove and second circulation groove collectively form a circulation channel for balls to move therein. A force sensor is disposed between the circulation member and the seal sheet. As a result, through the rigidity difference between the first and second end caps accompanied with the force sensor, it can be determined that if there is an abnormal circulation state.