OHT Transport Unit Load Distribution Adjustment
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Solution Overview
Problem
Overhead Hoist Transport (OHT) devices experience uneven load distribution among traveling wheels due to centrifugal force, leading to wear deviations and increased frictional forces, which affects the stability and efficiency of the transport process.
Innovation Solution
The OHT device incorporates a hoist unit with bolt grooves and a transport unit featuring front and rear traveling wheels, connected by position movement drive units that adjust the placement of the transport unit to ensure even load distribution among the wheels, utilizing load cell sensors to measure and control the load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the OHT device continues to travel on the traveling rail of a curved section, then the transport function is maintained, but the load distribution in a lateral direction becomes different due to centrifugal force, causing wear deviations among traveling wheels
Solution Approach 1:
The patent applies the dynamics principle by making the position of the transport unit adjustable through the position movement drive unit. The system dynamically adjusts the placement state of the transport unit on the plate based on real-time load distribution measurements from load cell sensors, allowing the system to adapt to varying operational conditions and maintain even load distribution among traveling wheels during curved section travel.
Solution Approach 2:
The patent implements feedback by using load cell sensors to measure the load distribution state of the traveling wheels and feeding this information back to the position movement drive unit. This closed-loop control system continuously monitors wear and load distribution, then adjusts the transport unit position accordingly to compensate for centrifugal force effects during curved section travel, thereby reducing wear deviations.
2Productivity
If the load distribution is uneven among traveling wheels, then the transport operation can continue, but the frictional forces increase and stability decreases
Solution Approach 1:
The system dynamically adjusts the transport unit position based on real-time load distribution measurements. By continuously monitoring which wheels carry more load and adjusting the placement state accordingly, the system maintains stable operation and reduces frictional forces while ensuring operation continuity.
Solution Approach 2:
The patent changes the positional parameters of the transport unit on the plate based on measured load distribution. By adjusting the placement state in response to varying load conditions, the system optimizes weight distribution across wheels to minimize friction and maximize stability during operation.
Data Source
AI summary
An overhead hoist transport (OHT) device is provided. The OHT device comprises a plate including a front bolt groove and a rear bolt groove which are extended and opened in a first direction, and a transport unit including a front body and a rear body, placed on the plate, wherein the transport unit comprises a front neck connector disposed on an upper face of the front bolt groove, a rear neck connector disposed on an upper face of the rear bolt groove, a front traveling wheel placed on both sides of the front body, a rear traveling wheel placed on both sides of the rear body, a front position movement drive unit which is connected to the front neck connector by a first connecting bolt passing through the front bolt groove and a rear position movement drive unit which is connected to the rear neck connector by a second connecting bolt passing through the rear bolt groove, and has the same structure as the front position movement drive unit, wherein the front position movement drive unit and the rear position movement drive unit adjust a placement state of the transport unit on the plate, depending on a load distribution state of the front traveling wheel and the rear traveling wheel.