Ball Screw Sacrificial Anode Layout for Rust Protection
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Solution Overview
Problem
Conventional ball screw systems in robots, especially those exposed to water or water vapor, face rusting issues due to inadequate protection, leading to maintenance challenges and reduced operational efficiency.
Innovation Solution
Incorporating antirust members made of materials with a higher ionization tendency, such as zinc or magnesium, which are electrically connected to the ball screw mechanism, acting as sacrificial anodes to prevent rusting of the screw shaft by preferentially oxidizing and extending the antirust agent's effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ball screw systems are used in environments exposed to water or water vapor, then the mechanical performance is maintained, but rusting occurs leading to reduced reliability and increased maintenance needs
Solution Approach 1:
The patent applies sacrificial anodes made of zinc or magnesium (metals with higher ionization tendency) that are electrically connected to the ball screw mechanism. These sacrificial anodes preferentially oxidize instead of the ball screw components, converting the harmful oxidation process into a beneficial protective mechanism. The anodes sacrifice themselves by corroding first, thereby protecting the main mechanism from rusting while exposed to water or water vapor environments.
2Reliability
If sacrificial anodes are added to the ball screw mechanism, then rust protection is improved, but the device complexity increases
Solution Approach 1:
The sacrificial anode system operates autonomously without requiring external control or monitoring. The zinc or magnesium anodes automatically provide cathodic protection through electrochemical reactions, sacrificing themselves to protect the ball screw mechanism. This self-service mechanism eliminates the need for complex active protection systems while maintaining reliable rust protection in humid environments.
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 antirust members effectively prevent rusting of the ball screw system, reducing maintenance needs and extending the antirust agent's lifespan, while facilitating easier maintenance by being easily accessible on exposed portions.
Implementation Method 1
The antirust member contains an antirust material having a higher ionization tendency than a material for the linear motion mechanism and is electrically connected to the linear motion mechanism
Data Source
AI summary
A linear motion apparatus has a linear motion mechanism having a long shaft member and a connecting member attached to the shaft member, wherein at least one of the shaft member and the connecting member moves in a longitudinal direction of the shaft member; and an antirust member attached to the linear motion mechanism, wherein the antirust member contains an antirust material having a higher ionization tendency than a material for the linear motion mechanism and is electrically connected to the linear motion mechanism.