Cylinder Piston End Detection via Remote Pressure Sensing
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Solution Overview
Problem
Conventional cylinder operation state monitoring devices face issues with sensor corrosion in food-related applications and mechanical contact wear, and existing non-contact methods may not be suitable for environments where sensors and wiring are exposed to cleaning liquids.
Innovation Solution
A cylinder operation state monitoring device that uses pressure detecting units to determine the piston's position based on differential pressure changes within the cylinder chambers, eliminating the need for sensors near the cylinder and thus preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position detecting sensors are installed in the vicinity of the cylinder to detect piston arrival, then piston position detection is achieved, but the sensors and wiring may become corroded when exposed to cleaning liquids in food-related applications
Solution Approach 1:
The invention extracts the position detection function from the mechanical contact domain (sensors near the cylinder) to the fluid pressure domain. By using pressure detecting units connected to the cylinder chambers via tubes, the system detects piston position indirectly through pressure changes, eliminating the need for sensors and wiring in the vicinity of the cylinder that would be exposed to cleaning liquids.
Solution Approach 2:
The invention introduces fluid pressure as an intermediary medium to transfer information about piston position. Instead of directly detecting piston position with sensors near the cylinder, the system uses pressure changes in the cylinder chambers (transmitted through tubes to remote pressure detecting units) as a mediator to convey position information, thereby protecting against sensor corrosion.
2Measurement precision
If limit sensors are used to detect piston arrival through mechanical contact, then position detection is achieved, but the contact points experience wear and have limited service life
Solution Approach 1:
The invention replaces the mechanical contact-based detection system (limit sensors with contact points) with a fluid pressure-based detection system. By using pressure detecting units to monitor pressure changes in the cylinder chambers, the system eliminates mechanical contact between the piston rod and detection elements, thereby avoiding wear and extending service life.
Solution Approach 2:
The invention applies pneumatic/hydraulic principles by using fluid pressure changes in the cylinder chambers as the detection mechanism. Pressure detecting units monitor the pressure in each chamber, and the determination unit identifies piston arrival based on pressure differential changes, replacing mechanical contact with fluid-based sensing.
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 reliable piston position detection without mechanical contact, preventing sensor corrosion and allowing safe use in food-related equipment by monitoring pressure changes within the cylinder chambers.
Implementation Method 1
a first pressure detecting unit configured to detect a pressure of the fluid inside the first tube, a second pressure detecting unit configured to detect a pressure of the fluid inside the second tube
Data Source
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AI summary
A monitoring device (10) has a first pressure sensor (50) that detects a first pressure value (P1) of a pressurized fluid in a first pipe (26), a second pressure sensor (52) that detects a second pressure value (P2) of a pressurized fluid in a second pipe (30), and a detector (54) that determines, on the basis of the first pressure value (P1) and the second pressure value (P2), whether or not a piston (16) has reached one end or the other inside a cylinder body (14).