Press Load Cell Protection via Guide Carriage Segmentation
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Solution Overview
Problem
Presses with load cells face destruction or falsified measurement results due to uncontrolled pressing forces, including tensile forces, transverse forces, and moments, which exceed the load cell's threshold, leading to inaccurate force monitoring.
Innovation Solution
The press design incorporates an anvil attached to a guide carriage and rail, allowing only forces in the pressing direction to be introduced into the load cell, while transverse forces and moments are absorbed or recorded by the guide system, and the anvil rests on a support surface without attachment, preventing tensile forces and allowing the load cell to be protected from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the load cell is installed directly in the power flow to monitor pressing forces, then the measurement capability is improved, but the load cell becomes vulnerable to destruction from tensile forces, transverse forces, and moments that exceed its threshold
Solution Approach 1:
The system is divided into separate functional components: the guide carriage and guide rail handle transverse forces and positioning, while the load cell exclusively measures compressive pressing forces. This segmentation allows each component to specialize in its intended function without being exposed to unwanted force types.
Solution Approach 2:
The guide carriage acts as an intermediary between the press frame and the anvil, absorbing and redirecting transverse forces and moments away from the load cell. This mediator protects the load cell from forces it cannot withstand while still allowing accurate measurement of the pressing force.
2Stability of the object's composition
If the anvil is rigidly attached to the support surface, then the structural stability is improved, but tensile forces can lift the anvil during jamming situations, potentially damaging the load cell
Solution Approach 1:
The support surface is designed with controlled mobility, allowing the anvil to shift position within certain limits rather than being rigidly fixed. This dynamic capability enables the system to accommodate tensile forces during jamming without transferring them to the load cell, while still maintaining stable operation during normal pressing.
3Reliability
If multiple guide carriages are used to improve guide stability, then the protection from transverse forces is improved, but the available installation space is reduced
Solution Approach 1:
Instead of using multiple guide carriages for complete redundancy, the system uses a single optimally designed guide carriage that provides sufficient stability for the application. This partial action approach achieves adequate protection without the space consumption of multiple carriages.
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
This configuration reduces the risk of load cell damage and ensures accurate force measurement by isolating the load cell from non-compressive forces, maintaining measurement integrity even under high pressing forces that might bend the press frame.
Implementation Method 1
the anvil lies unfastened on the support surface... which can basically migrate on the support surface when forces act on the anvil in the direction tangential to the support surface, are large enough to overcome the frictional force between the anvil and the support surface
Data Source
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AI summary
A press (100) is provided with a press punch (10), with an anvil (20, 120) for receiving the force exerted by the press punch (10) during the pressing process, and with a load cell (40, 140) for measuring the force exerted during the pressing process, wherein the anvil (20, 120) is attached to at least a guide carriage (30) which is movably guided on a guide rail (31) in the pressing direction, and wherein the anvil (20, 120) rests on a support surface, via which forces acting in the pressing direction are introduced into the load cell either directly or via a component arranged between the anvil (20, 120) and the load cell (40, 140).