Tray Elevator Fastening Structure for Eccentric Load Correction

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Solution Overview

Problem

Elevator units used in semiconductor testing face issues with eccentricity and eccentric loads caused by wrapping connector driving means like chains or belts, leading to jamming and wear of ball bushes that support tray movement.

Innovation Solution

The implementation of a corrective fastening member system that rotates around a fixed fastening member to correct the direction of force applied to tray guide blocks, thereby addressing eccentricity and eccentric loads during the elevation and lowering of trays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a wrapping connector driving member (chain or belt) is used to elevate and lower the tray guide block, then the tray transfer function is achieved, but eccentricity and eccentric load cause jamming and wear of ball bushes

Engineering Contradiction:

Improvetray transfer functionVSAvoidjamming and wear of ball bushes

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A corrective fastening member is introduced as an intermediary between the wrapping connector driving member and the tray guide block. This intermediary component corrects the direction of force applied to the tray guide block, preventing eccentric load transmission to the ball bushes while maintaining the tray transfer function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The corrective fastening member changes the directional parameter of the force vector applied to the tray guide block. By adjusting the force direction to be perpendicular to the guide block surface, the system eliminates eccentric loading conditions while preserving the vertical movement capability.

Inventive Principle:

Principle #35Parameter changes

2Speed

If the wrapping connector driving member moves, then tray elevation and lowering is achieved, but eccentric load causes stress accumulation and damage to ball bushes

Engineering Contradiction:

Improvetray elevation speedVSAvoidball bush durability

Core Design Contradiction:

SpeedVSStrength

Solution Approach 1:

The corrective fastening member serves as a force direction mediator that intercepts the eccentric load from the moving wrapping connector and redirects it. This prevents stress accumulation in the ball bushes while allowing continuous tray elevation and lowering operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If a fixed fastening member is used to connect the tray guide block, then structural stability is achieved, but eccentric force causes jamming of driving parts

Engineering Contradiction:

Improvetray guide block stabilityVSAvoiddriving part smooth operation

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The fastening system is segmented into two functional components: a fixed fastening member for structural stability and a corrective fastening member for force direction adjustment. This segmentation allows the system to simultaneously achieve stability and smooth operation by separating the stabilization function from the force transmission function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The corrective fastening member acts as an intermediary that decouples the stable fixed connection from the eccentric driving force. It transmits only the necessary vertical force to the tray guide block while filtering out the harmful eccentric components.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11892500B2Elevator unit for transferring tray and test handler including same

Publication Date: 2024.02.06 SYSTEM ENGINEERING MEGA SOLUTION CO LTD

AI summary

An elevator unit for transferring a tray includes a tray guide block on which a tray is seated, a wrapping connector driving member configured to elevate and lower the tray guide block, a fixed fastener connected to the tray guide block, and a corrective fastener connected to the wrapping connector driving member and configured to rotatably coupled to the fixed fastening member.