Lift Truck Clamp Force Circuit With Pressure-Threshold Feedback
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Solution Overview
Problem
Existing hydraulic control systems for clamp arms in lift trucks often fail to accurately control the clamping force, leading to potential damage from either under-clamping or over-clamping of loads, due to variations in load characteristics and geometries.
Innovation Solution
A hydraulic control circuit with bladders that sense pressure and automatically limit the clamping force by using a threshold pressure to prevent further pressure application once the load is gripped, combined with a charging system to maintain the necessary clamp force without overshooting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clamping force is increased to ensure load grip, then the reliability of load lifting is improved, but the load may be crushed or deformed due to excessive pressure
Solution Approach 1:
The hydraulic control system incorporates pressure sensing elements that continuously monitor the clamping force applied to the load. When the sensed pressure reaches a predetermined threshold, the system automatically regulates the hydraulic pressure to maintain constant clamping force, preventing over-clamping damage while ensuring sufficient grip reliability
Solution Approach 2:
The system dynamically adjusts the hydraulic pressure parameter based on load characteristics. By changing the pressure level according to the specific load being handled, the system optimizes the balance between maintaining reliable load grip and preventing damage from excessive clamping force
2Object-affected harmful factors
If the clamping force is decreased to avoid load damage, then the harm to the load is reduced, but the load may become dislodged due to insufficient grip
Solution Approach 1:
The pressure sensing feedback mechanism ensures that the clamping force never falls below the threshold required for reliable load grip. The system continuously monitors and adjusts pressure to maintain the minimum necessary force, preventing load dislodgement while avoiding excessive clamping
3Device complexity
If a fixed clamping force control system is used, then the device complexity is reduced, but the system cannot adapt to different load characteristics and geometries
Solution Approach 1:
The hydraulic control system performs self-regulation through integrated pressure sensing and automatic control mechanisms. The system independently adjusts clamping force based on real-time pressure feedback, eliminating the need for complex external control systems while maintaining adaptability to various load characteristics and geometries
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 system effectively prevents damage by ensuring the clamp force is accurately controlled, maintaining the necessary force to lift loads without applying excessive pressure, thus reducing the risk of crushing or deforming the load.
Implementation Method 1
A pair of bladders 20, each constructed from a pressure-sensitive material, are affixed to the inner surface of each clamp arm 12, 14
Implementation Method 2
A hydraulic control circuit 50 for operating the carton clamp attachment 10
Data Source
AI summary
The improved hydraulic system utilizes a secondary hydraulic force control circuit that changes the gripping force on the load independently of movement of the clamp arms.