Belleville Spring Stiffness Detection with Spherical Loading
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Solution Overview
Problem
Accurate detection of Belleville spring stiffness is crucial for its optimal functioning in heavy machinery, but existing methods lack precision and are prone to biased loading, which affects the reliability of stiffness measurement.
Innovation Solution
A stiffness detecting apparatus utilizing a universal material testing machine, a loading beam, dial gauges, and a spherical squeezing head to apply load evenly to the Belleville spring, with symmetrically placed dial gauges to ensure unbiased loading and calculate stiffness based on deformation and force readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional loading methods are used to measure spring stiffness, then the measurement process is simple, but the loading is biased and measurement precision deteriorates
Solution Approach 1:
The patent employs a spherical squeezing head with a spherical contact surface that contacts the top surface of the Belleville spring. This spherical geometry ensures point contact and allows the spring to be loaded in any orientation without introducing bias, thereby achieving accurate stiffness measurement while maintaining a relatively simple device structure
Solution Approach 2:
The patent uses two dial gauges positioned asymmetrically at different locations on the Belleville spring to detect deformation. By comparing readings from these asymmetrically placed gauges, the system can identify and compensate for any biased loading, thus improving measurement precision
2Reliability
If the Belleville spring is not properly aligned with the loading axis, then the setup is easier, but biased loading occurs and measurement reliability deteriorates
Solution Approach 1:
The patent uses two dial gauges positioned at different locations on the Belleville spring to provide feedback on the loading condition. By comparing the readings from both gauges, the system can detect misalignment or biased loading and allow for adjustment until both readings are equal, ensuring reliable measurement
Solution Approach 2:
The spherical squeezing head with its curved surface allows the Belleville spring to be positioned in various orientations while maintaining proper contact. The spherical geometry naturally accommodates slight misalignments and ensures that the loading force passes through the center of the spring, improving reliability without requiring precise positioning
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 apparatus provides precise and unbiased stiffness measurement of Belleville springs, ensuring accurate determination of their load-carrying capacity and optimal working range, thereby enhancing the reliability of Belleville springs in heavy machinery applications.
Implementation Method 1
the cup-shaped loading barrel is provided with a spherical recess at the center of its bottom surface, which mates with the spherical squeezing head to eliminate biased loading
Implementation Method 2
The deformation amount of the Belleville spring is obtained by readings of the first dial gauge and the second dial gauge
Implementation Method 3
The stiffness value of the Belleville spring could be calculated by introducing the deformation amount value and the force value into calculation formulas
Data Source
AI summary
The present invention discloses an apparatus for detecting spring stiffness which comprises a universal material testing machine, a loading beam of the universal material testing machine, a fixing rod of bracket for Belleville spring deformation detection, a movable clamping rod of bracket for Belleville spring deformation detection, a dial gauge, etc.