Load Cart Platform Control for Low-Impact Loading
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Solution Overview
Problem
Carts that raise and lower their loading platforms often cause impacts on loads due to the platform being fixed at predetermined vertical positions, leading to potential damage when loads are placed or removed.
Innovation Solution
A cart equipped with a base, extendable mechanism, drive device, rotation sensor, current sensor, and control device that adjusts the loading platform's position based on detected weight changes, using a back drive property to minimize impacts by raising or lowering the platform as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the loading platform is held at a predetermined vertical position, then the platform maintains stable positioning, but impacts occur on loads when placed or removed
Solution Approach 1:
The loading platform transitions from a fixed predetermined position to a dynamically adjustable position. The control device modifies the target vertical position in real-time based on weight sensor feedback, allowing the platform to adapt its height to minimize impact on loads during placement or removal, while maintaining stability at the new position.
Solution Approach 2:
A weight sensor detects the weight of the load on the platform and provides feedback to the control device. The control device uses this feedback to determine whether to adjust the target vertical position of the platform, creating a closed-loop control system that responds to actual loading conditions to prevent impact damage.
2Reliability
If the loading platform is fixed at a predetermined position, then positioning is simple and reliable, but the system cannot adapt to different loading conditions
Solution Approach 1:
The system maintains the reliability of predetermined positioning while adding adaptability through dynamic adjustment capability. The control device can modify the target vertical position based on weight sensor feedback, allowing the platform to adapt to different loading conditions such as heavy loads requiring lower positions or lightweight loads allowing higher positions, while still achieving stable holding at the determined position.
Solution Approach 2:
The target vertical position parameter of the loading platform is made variable rather than fixed. The control device changes this parameter based on weight sensor feedback and operational requirements, enabling the system to adapt to different loading conditions while maintaining reliable positioning at the adjusted parameter value.
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 cart effectively reduces impacts on loads by dynamically adjusting the loading platform's position in response to weight changes, maintaining stability and minimizing damage during loading and unloading.
Implementation Method 1
a drive device that raises and lowers the loading platform by rotating an electric motor and consequently extending and retracting the extendable mechanism vertically
Implementation Method 2
a rotation sensor that detects the rotation of the electric motor and outputs a signal
Implementation Method 3
a current sensor that detects a drive current of the electric motor and outputs a signal
Implementation Method 4
The drive device has a back drive property that rotates the electric motor when an external force raises or lowers the loading platform
Data Source
AI summary
A cart that reduces impact on a load placed on a loading platform 50. The cart 10 includes a drive that raises/lowers the platform 50 by rotating a motor which extends/retracts a mechanism 70 vertically. The drive rotates the motor when an external force raises/lowers the platform 50 and extends/retracts the mechanism 70. When a control device detects lowering of the platform 50 held at a predetermined vertical position and detects an increase in weight of the load on the platform 50 based on an output signal of a rotation sensor that detects rotation of the motor and an output signal of a current sensor that detects a drive current of the motor, the control device controls the motor such that the platform 50 is raised and held at the either the predetermined vertical position or a vertical position lower than that position.