Pneumatic Grip Pressure Control for Safe Materials Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Materials testing systems face safety concerns due to rapid grip closure, potential specimen damage, and lack of reliable pressure control, which affects result repeatability and accuracy, with manual pressure settings being time-consuming and unreliable.
Innovation Solution
An electronic control system for hydraulic or pneumatic components that allows adjustable low gripping pressure for safety, slow grip closure, and automatic pressure ramp-up to full pressure, with firmware logging and checking pressure settings to ensure test initiation only when target pressure is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual pressure setting is used for each specimen type, then pressure control is simple, but it is time-consuming and impacts repeatability of results
Solution Approach 1:
The system automatically determines and sets the gripping pressure based on the specimen type selected in the test parameters, eliminating the need for manual pressure setting by the operator. The control unit retrieves the appropriate pressure value from stored data associated with the specimen type and automatically configures the pneumatic system.
Solution Approach 2:
The manual mechanical adjustment of pressure is replaced by an automated electronic control system that reads specimen type information and automatically sets the pressure parameters, substituting operator action with automated computational and control processes.
2Force
If full test pressure is applied during grip closure, then gripping force is sufficient, but it creates safety hazards and may damage the specimen
Solution Approach 1:
The grip closure process is divided into two distinct phases: a first phase at reduced pressure for safe initial closure and positioning, and a second phase at full test pressure for achieving the required gripping force. This segmentation allows the system to avoid applying full pressure during the potentially hazardous initial closure while still achieving sufficient grip strength.
Solution Approach 2:
The system performs a preliminary grip closure at reduced pressure before applying full test pressure. This preliminary action positions the grips safely on the specimen without the full force that would cause damage or safety hazards, and only after this preliminary positioning does the system proceed to apply the full required pressure.
3Reliability
If pressure feedback is implemented, then pressure control is improved, but it may impact the accuracy of the results
Solution Approach 1:
The pressure feedback signal is extracted and used solely for control purposes to maintain the desired gripping pressure, while the actual test measurements are taken through separate, independent sensing channels. This separation ensures that the feedback control system does not interfere with or contaminate the test result measurements.
Solution Approach 2:
The system uses an intermediary control mechanism that regulates pressure based on feedback signals, acting as a mediator between the pressure source and the specimen. This intermediary control ensures stable pressure application without directly interfering with the measurement process, maintaining both pressure reliability and measurement accuracy.
4Productivity
If fast closing rate is used, then test setup time is reduced, but it may pinch user fingers or damage the specimen
Solution Approach 1:
The grip closure speed is made dynamic rather than fixed: the system initially closes at a reduced speed for safety during positioning, then automatically transitions to a faster closing rate once the grips are properly positioned on the specimen. This dynamic adjustment maintains safety during the critical positioning phase while achieving productivity gains during the subsequent rapid closure phase.
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
Enhances user safety, improves result repeatability, and ensures accurate pressure control, preventing tests from proceeding unless proper pressure is reached, thereby increasing the reliability and safety of materials testing.
Implementation Method 1
a pneumatic control system to open and close the grips and to regulate the pressure
Implementation Method 2
receive pressurized air through pressurized air supply
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to an electronic control system for pneumatic grips, using proportional air pressure control, as employed in the field of materials testing. The disclosed embodiments allow for variable gripping pressure thereby increasing the safety for the user/operator. Additionally, materials testing will not commence until the proper pressure for testing has been achieved.