Closed-Loop Bolt Transverse Load Control via PLC Feedback
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Solution Overview
Problem
Existing testing machines for bolt transverse load looseness can only provide transverse displacement load, requiring costly and complex mechanical changes to adjust load conditions, and struggle to maintain consistent transverse force or displacement loads due to looseness, which affects preload and stability.
Innovation Solution
A closed-loop control method using a testing machine with a load transfer and load control part, employing sensors and a PLC control system to adjust motor rotation, ensuring accurate control of transverse load by analyzing signals and issuing instructions to maintain desired force or displacement amplitudes within set error thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the testing machine uses a fixed mechanical structure to provide transverse displacement load, then the structure is simple, but adjusting the load conditions requires costly and complex mechanical changes
Solution Approach 1:
The patent transforms the fixed mechanical structure into a dynamic, adjustable system by introducing a motor-driven screw rod mechanism. The load control motor rotates the screw rod to drive the slide table, enabling continuous adjustment of transverse displacement amplitude without mechanical reconfiguration. This dynamic mechanism allows the same structure to adapt to different load conditions through motor control parameters alone.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with a motorized control system. Instead of requiring physical reconfiguration of mechanical components to change load conditions, the system uses motor rotation speed and direction control to achieve the same effect, substituting mechanical complexity with electrical control simplicity.
2Reliability
If the testing machine provides fixed transverse displacement load, then the control system is simple, but the transverse force load decreases gradually due to looseness
Solution Approach 1:
The patent implements a closed-loop feedback control system where sensors continuously monitor the actual transverse force load and displacement, comparing them with target values. When looseness causes the force load to decrease, the system automatically adjusts the motor-driven displacement to compensate, maintaining consistent force load throughout the testing process. This feedback mechanism ensures reliability while automating the control complexity.
3Manufacturing precision
If the transverse displacement amplitude is increased to maintain force load, then the force load consistency is improved, but the control precision becomes more difficult to maintain
Solution Approach 1:
The closed-loop feedback system continuously monitors both displacement and force load, enabling precise control even when displacement amplitude needs to be adjusted. The system calculates the optimal displacement adjustments based on real-time force load measurements, maintaining control precision through automated compensation rather than manual intervention.
Solution Approach 2:
The patent introduces sensors and a control system as intermediaries between the mechanical components and the testing process. These intermediaries measure physical quantities, process the information, and automatically adjust the system parameters, thereby maintaining precision while managing the complexity through automated control algorithms.
Data Source
AI summary
A closed-loop control method based on a testing machine for accurately controlling the loosening of a bolt transverse load is disclosed. The testing machine for accurately controlling the loosening of the transverse load comprises a load generating motor, a load transfer mechanism, a load control motor and a load control mechanism. The control method of the present invention controls the load generating motor to drive the load transfer mechanism based on control commands, displacement signals collected by the displacement sensor and force signals collected by an S-shaped column type pressure sensor. The testing machine for the looseness of the bolt transverse load is essential in the aspect of exploring a looseness law of a bolt, and can be used to simulate load bearing conditions of the bolt. However, under the condition that some bolts bear constant force load transversely, the testing machine is not used or is inaccurate. The control method of the present invention can accurately control the load transverse load to be stable, especially can ensure constant transverse load and can also simulate the transverse load bearing situation of the bolt more accurately and more comprehensively.