Electric Cylinder Strain Detection Under Controlled Self-Load
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Solution Overview
Problem
The existing electric press systems fail to accurately determine the replacement of load cells due to reliance on load cell outputs without load, leading to potential misjudgments even when outputs are within allowable ranges.
Innovation Solution
An electric cylinder system that includes a ball screw mechanism, a nut, a cylindrical body, and a strain detector, where the nut abuts against the cylindrical body to generate a load, allowing the strain detector to accurately assess abnormalities without relying on workpiece loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electric press determines replacement of the load cell based only on the output of the load cell when there is no load, then the determination process is simple, but the accuracy of detection of abnormality is insufficient
Solution Approach 1:
The electric cylinder system uses its own nut and ball screw mechanism to generate the load on itself, eliminating the need for external workpieces or additional testing equipment. The nut abuts against the cylindrical body to generate a predetermined load, allowing the strain detector to be tested using the system's own components.
Solution Approach 2:
The system changes the operational state of the strain detector from no-load condition to loaded condition by having the nut abut against the cylindrical body. This parameter change (from no load to predetermined load) enables accurate detection of abnormality by comparing the strain detector output under known load conditions.
2Reliability
If the output of the load cell when there is no load falls within an allowable range, then the load cell appears normal, but the output of the load cell when there is a load may fail to fall within the allowable range
Solution Approach 1:
The system uses its own nut and ball screw mechanism to generate the load on itself, eliminating the need for external workpieces or additional testing equipment. The nut abuts against the cylindrical body to generate a predetermined load, allowing the strain detector to be tested using the system's own components.
Solution Approach 2:
The system changes the operational state of the strain detector from no-load condition to loaded condition by having the nut abut against the cylindrical body. This parameter change (from no load to predetermined load) enables accurate detection of abnormality by comparing the strain detector output under known load conditions.
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
Enhances the accuracy of detecting strain detector abnormalities by applying a controlled load, improving detection precision compared to systems relying solely on no-load outputs.
Implementation Method 1
a ball screw mechanism including a ball screw making a rotary motion via a drive force of an electric motor
Implementation Method 2
a strain detector fixed to the cylindrical body and detecting a value corresponding to the displacement of the ball screw mechanism
Data Source
AI summary
An electric cylinder system includes: a rod; a ball screw mechanism; a nut connected to the rod; a cylindrical body including a contact portion, the contact portion configured to be abutting the nut making the linear motion, the cylindrical body configured to support the ball screw mechanism in such a manner that the ball screw mechanism is displaceable in the axis direction of the ball screw; a strain detector fixed to the cylindrical body and configured to detect a value corresponding to a displacement of the ball screw mechanism; and a control section configured to make the ball screw mechanism be displaced by making the nut abut against the contact portion, and configured to detect an abnormality of the strain detector based on the value detected by the strain detector according to the displacement of the ball screw mechanism.