Friction-Informed Piston Pressing Device for Pressure Control
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Solution Overview
Problem
Existing pressing devices fail to accurately control the pressure inside a pressure vessel during the holding stroke.
Innovation Solution
A pressing device equipped with a piston body, piston seal, piston axial force information detection, driving device, friction information storage, and drive control unit, allowing for precise control of the piston's reciprocating motion to maintain constant pressure within the vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the piston body is kept stationary during the holding stroke, then the device structure is simple, but the pressure control accuracy deteriorates
Solution Approach 1:
The piston body is made dynamically movable during the holding stroke through reciprocating motion controlled by the drive control unit, transforming a static system into a dynamic one to achieve accurate pressure control while maintaining relatively simple device structure
Solution Approach 2:
The piston body performs periodic reciprocating motion (moving forward and backward) during the holding stroke, using periodic small-amplitude movements to continuously adjust and maintain pressure at the target value, thereby improving pressure control accuracy without requiring complex additional control mechanisms
2Measurement precision
If friction information is stored and used for control, then the pressure control accuracy improves, but the device complexity increases
Solution Approach 1:
Friction information between the piston seal and pressure vessel is measured and stored in advance in a friction information storage unit before actual pressing operations, allowing the drive control unit to compensate for friction effects during pressure control without requiring complex real-time friction measurement systems
Solution Approach 2:
The drive control unit uses stored friction information together with piston axial force information to calculate and adjust driving forces, implementing a feedback control mechanism that improves pressure control accuracy while keeping the control system relatively simple by using pre-stored friction data
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 high-accuracy pressure control during the holding stroke by utilizing piston axial force and friction information to adjust the piston's movement, ensuring consistent vessel internal pressure.
Implementation Method 1
friction information pertaining to the frictional force between the piston seal and the pressure vessel
Data Source
AI summary
A piston axial force information detection unit (53) detects piston axial force information pertaining to an axial force applied to a piston body (21). A friction information storage unit (62) stores friction information pertaining to a frictional force between a piston seal (23) and a pressure vessel (10) when the piston body (21) moves relative to the pressure vessel (10). A drive control unit (65) controls a drive device (40) on the basis of the piston axial force information and the friction information. In a holding stroke for controlling the pressure inside the pressure vessel (10) so as to be constantly held, the drive control unit (65) controls the drive device (40) so that the piston body (21) reciprocates with respect to the pressure vessel (10).