Servo Valve Chuck Positioning for Selectable Finger Stop Points
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Solution Overview
Problem
The existing chuck devices have limited adjustable movement of gripping members, making precise positioning difficult and requiring complex manual adjustments, and lack the ability to control the open or closed state using electrical signals from higher-level controllers.
Innovation Solution
A drive system with a servo valve that allows precise control of fluid supply to a chuck device, including a detection sensor to monitor piston position and a controller to adjust the valve opening, enabling the fingers to be stopped at any position with high precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the end member is rotated to adjust the gripping position, then the gripping position can be adjusted, but the adjustment work becomes complicated and high precision positioning is difficult to achieve
Solution Approach 1:
The patent replaces the manual mechanical adjustment system (rotating the end member) with an automated control system consisting of a servo valve, detection sensor, and controller. The controller receives signals and automatically adjusts the piston displacement amount through the servo valve, eliminating the need for manual rotation operations while achieving high precision positioning through electronic control and feedback mechanisms.
2Adaptability or versatility
If the end member is rotated to adjust the gripping position, then the gripping position can be adjusted, but the adjustment work is complicated
Solution Approach 1:
The patent replaces the complex mechanical adjustment mechanism (rotating the end member along the axial direction) with an automated control system. The servo valve, controlled by the controller based on detection sensor feedback, automatically adjusts the piston displacement, thereby achieving position adaptability without requiring complex manual mechanical operations.
3Manufacturing precision
If a servo valve is used to control fluid supply, then the fingers can be stopped at any position with high precision, but the device complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism where the detection sensor continuously monitors the piston position and feeds this information back to the controller. The controller compares the actual position with the target position and adjusts the servo valve accordingly, enabling high precision positioning through closed-loop control despite the increased device complexity.
Solution Approach 2:
The patent uses a servo valve to precisely control the supply of compressed air (fluid) to the piston. By regulating the fluid pressure and flow through the servo valve, the system achieves precise control over piston displacement and finger positioning, leveraging pneumatic principles to overcome the complexity issue through efficient fluid control.
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 easy and precise control of the gripping members' position by using a servo valve to manage fluid supply, allowing for flexible and accurate positioning without the need for manual adjustment of the end member, improving operational efficiency and precision.
Implementation Method 1
a piston displaceable in an axial direction under an effect of supply of fluid
Implementation Method 2
a switching valve configured to switch a state of supply of the fluid to the chuck device. The switching valve is a servo valve, of which degree of valve opening is controllable based on a control signal input from the controller
Implementation Method 3
a detection sensor configured to detect an axial position of the piston
Implementation Method 4
a piston displaceable in an axial direction under an effect of supply of fluid
Data Source
AI summary
A drive system for driving a chuck device includes a controller and a switching valve, which is a 5-port servo valve, switching the state of supply of compressed air to the chuck device based on a valve command signal from the controller. During switching of first and second fingers from a closed position to an open position, when the axial position of a piston reaches a switch point, which is a predetermined distance short of a target position corresponding to a freely selected intermediate position of the first and second fingers, the switching valve is opened at a third opening for a predetermined period and then switched to be opened at a fourth opening so that supply and discharge of compressed air are stopped. As a result, the first and second fingers stop in the intermediate position.