Tensile Force Measurement for Bending-Stiff Long Products
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Solution Overview
Problem
Existing tensile force measuring devices struggle to accurately determine the tensile force on inflexible long objects, as bending-elastic deformation during measurement introduces additional transverse forces, complicating the interpretation of measurement results.
Innovation Solution
A tensile force measuring device with an additional support unit and contact element that maintains a constant wrap angle, allowing for the detection of two resultant forces, which are used in conjunction with predefined characteristic maps to determine the actual tensile force by accounting for bending-elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the long product is deflected at the deflection device during measurement, then the tensile force can be determined through partial encirclement, but bending-elastic deformation occurs in inflexible materials causing additional transverse forces that complicate measurement accuracy
Solution Approach 1:
The measurement process is segmented into two distinct measurement positions: first measurement position for obtaining a first measurement value, and second measurement position for obtaining a second measurement value. This segmentation allows the system to separate the tensile force component from the bending-elastic deformation component by taking measurements under different geometric conditions while maintaining the same wrap angle.
Solution Approach 2:
The system changes the geometric parameters of the measurement setup by adjusting the longitudinal distance between the first support unit and the deflection device to create different measurement positions. By varying this distance parameter, the system obtains different measurement values that can be used to differentiate between tensile force and bending deformation effects through evaluation according to predefined characteristic maps.
2Measurement precision
If guide elements are used to fix the long product in the measuring position, then partial encirclement is achieved, but the wrap angle must be kept constant for every measurement which complicates the measurement procedure
Solution Approach 1:
The system replaces manual adjustment and mechanical alignment procedures with an automated evaluation unit that calculates the tensile force based on measurements from the two measurement positions. The evaluation unit uses predefined characteristic maps to automatically differentiate between tensile force and bending deformation, substituting complex mechanical alignment procedures with computational evaluation.
Solution Approach 2:
The measurement device is designed to be universally applicable to both flexible and inflexible long products by incorporating the ability to perform measurements in two different positions and using evaluation algorithms that account for material properties. The same device and procedure can handle different material types (ropes, wires, rods, struts) by adjusting the longitudinal distance and using appropriate characteristic maps.
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
Enables precise determination of tensile force on long objects undergoing bending-elastic deformation by using characteristic curves to differentiate between tensile and bending components, providing a reliable and universally applicable measurement solution.
Implementation Method 1
the deflection of the material at the deflection device during measurement by the tensile force measuring device also causes a bending-elastic deformation of the material
Data Source
Figure 1
AI summary
The invention relates to a tensile force measuring device for detecting the tensile force acting on a long item, with a base body having a first outer support unit with a first guide element adjustable between a release position releasing the long item and a locking position fixing the long item in a measuring position, a second outer support unit with a second guide element that can be brought into contact with the long item, a deflection device arranged between the first and second support unit with a deflection element for partially wrapping the long item in the measuring position and a force measuring unit connected to the deflection device for detecting and displaying a force resulting from the partial wrapping acting on the deflection element.In order to provide a tensile force measuring device that is universally suitable for measuring the tensile force acting on long goods, it is provided that for the detection and/or display of a second force resulting from the partial wrap by the force measuring unit on the base body at a distance from the first support unit, an additional support unit with a contact element is arranged, which is adjustable between a measuring position that fixes the long goods in their position on the additional support unit in the measuring position of the first guide element and a disengaged position spaced from the long goods.