Fluid-Dynamic Circuit with Quick Discharge for Arm Control
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Solution Overview
Problem
Existing fluid-dynamic circuits for controlling the movements of drive members in machines, such as tire demounting machines, face challenges in accurately controlling speed and contact force between tools and objects, leading to increased manufacturing costs, complex sensor setups, and the need for high-precision sensors, which are costly and prone to inaccuracies.
Innovation Solution
A fluid-dynamic circuit comprising a pressurized fluid source, distributor valve, and a reciprocating actuator with a slider in a sliding seat, featuring a first and second transport line with quick discharge means, allowing controlled speed and stroke length of the operating arm, preventing violent impacts and overrun, and enabling autonomous operation without manual control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If proximity sensors are mounted to detect arm position, then detection accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the detection function from external proximity sensors and integrates it directly into the actuator mechanism. The piston rod itself becomes the detection element, with its extension triggering the limit stop detection, thereby eliminating the need for separate sensors and their associated mounting and wiring complexity
Solution Approach 2:
The patent merges the actuation function and detection function into a single integrated system. The actuator's piston rod serves dual purposes: driving the operating arm and simultaneously detecting the limit stop position through direct mechanical contact, combining two previously separate functions into one component
2Measurement precision
If high-precision sensors are used to detect contact position, then measurement accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive high-precision sensors with a simple, inexpensive mechanical limit stop mechanism. The limit stop is a basic mechanical component that can be easily manufactured and replaced if needed, providing accurate detection without the high cost of precision electronic sensors
Solution Approach 2:
The patent replaces electronic sensor-based detection with a purely mechanical detection system. The limit stop uses direct mechanical contact between the piston rod and the stop element to detect position, substituting complex electronic measurement systems with simple mechanical principles
3Productivity
If actuator speed is increased to improve productivity, then output is improved, but control precision and impact control deteriorate
Solution Approach 1:
The patent uses periodic action through the limit stop mechanism that periodically interrupts the actuator's motion at the predetermined position. The limit stop creates a rhythmic stop-start pattern that ensures accurate positioning while allowing high-speed operation during the non-contact portions of the cycle
Solution Approach 2:
The patent allows the actuator to rush through the movement phase at high speed and then skip directly to the precise stopping point via the limit stop mechanism. This enables high productivity during traversal while maintaining precision at the critical contact position
4Ease of operation
If manual control is used to operate the actuator, then operational flexibility is improved, but automation level deteriorates
Solution Approach 1:
The patent implements self-service automation where the system automatically detects the limit stop position through the mechanical limit stop mechanism and automatically controls the actuator's operation. The system serves itself by using its own actuator components for detection and control, eliminating the need for external manual intervention while maintaining operational precision
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
The solution effectively controls the speed and position of the operating arm, preventing overruns and ensuring accurate contact with objects, while reducing manufacturing costs and eliminating the need for manual operation, thereby enhancing the precision and efficiency of machine operations.
Implementation Method 1
a source of a pressurized fluid
Implementation Method 2
a source of a pressurized fluid
Implementation Method 3
quick discharge means mounted thereto, whose opening is designed to be controlled by actuator means
Data Source
AI summary
A fluid-dynamic circuit includes a source of a pressurized fluid; a distributor valve for distributing the pressurized fluid to transport lines; a feeding line for feeding the pressurized fluid, which is interposed between the source and the valve; a main user apparatus, which is reciprocatingly operated by an actuator that includes a slider sealably fitted in a sliding seat of a containing element divided thereby into a first chamber and a second chamber in opposite positions and having variable volumes; and second and third transport lines for the pressurized fluid, which are interposed between the distributor valve and the first and second chamber respectively, a first derived transport line being interposed between the valve and at least one of the second and third transport lines, and having a normally closed quick discharge device mounted thereto, whose opening is designed to be controlled by the actuator.