knob testing fixture
DESCRIPTION
For Mechanical Testing like Flexivity /TRANSCRIPT
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Presented By:-
Guided By:-
VASUDEVANAND VINAYAK NANCHE
V.J.T.I. Mumbai / J.N.V. Sindhudurg
Mr. MoKhanL&T Powai.
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Electrical & Electronics Business Group (EBG)
Dept : Switchgear Quality Control & Reliability (SQR)
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By – Vasudevanand Nanche
SQR-QA
Project
Fixture for flexivity testingof plastic components
i. e. Knobs used in all types of MCCB
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Synopsis:- What is fixture & flexivity? Need for fixture. Testing Components. Testing Machine. Temporary Arrangement. Disadvantage of Temporary arrangement Working principle of the Fixture. Design of fixture. Advantages of the Fixture.
Fixture for flexivity testing of MCCB Knobs
![Page 5: Knob Testing Fixture](https://reader034.vdocuments.net/reader034/viewer/2022051208/54666214af795997368b50f4/html5/thumbnails/5.jpg)
Fixture is the device that locates & holds component while testing.
Flexivity refers to the absolute range of movement.
It is the ability to flex or bend the component within a specified limit.
Fixture for flexivity testing of MCCB Knobs
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Need for designing the fixture
Requirement for permanent fixture on UTM
Advantage over temporary arrangements
Load Vs Displacement values
Regular testing
Fixture for flexivity testing of MCCB Knobs
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Testing Components:-
Fixture for flexivity testing of MCCB Knobs
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Testing Machine :-Fixture for flexivity testing of MCCB Knobs
Ram[Place for Fixture]
UNIVERSAL
TESTING
MACHINE
[ UTM ]
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Temporary Arrangement:-
Fixture for flexivity testing of MCCB Knobs
![Page 10: Knob Testing Fixture](https://reader034.vdocuments.net/reader034/viewer/2022051208/54666214af795997368b50f4/html5/thumbnails/10.jpg)
Disadvantages of the Arrangement:-
Load Vs Displacement values are vary; because the clearance present is more.
Diff-diff arrangements are required for all types.
Time consuming test.
Fixture for flexivity testing of MCCB Knobs
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Polarity Testing Setup
Working PrincipleComponent is fixed from one
side (as in case of breaker) & allowed to bend from another side so that load is applied vertically at extended part of Knob.
Here, the contact occurs between tool & component is line contact.
Hence, we have designed the fixture in such a way that, as the load is increasing, the plastic Knob tends to bend downwards proportionally & we can get the accurate values forLoad Vs Displacement.
Fixture for flexivity testing of MCCB Knobs
![Page 12: Knob Testing Fixture](https://reader034.vdocuments.net/reader034/viewer/2022051208/54666214af795997368b50f4/html5/thumbnails/12.jpg)
Fixture for flexivity testing of MCCB Knobs
Design of fixture:-
Vice Pin(Moving)
Vice Moving PartKnurled at Lower Surface
Vice Main Body(Moving)
Rod(Fixed)
Base(Fixed on Ram)
Pin
Guiding System
Bush
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Advantages of the Fixture:-
Flexivity i. e. load Vs Displacement values of the Knob can be accurately found out.
Used for all the types of MCCB i. e. Multi purpose.
Save time for testing.
Safe & easy to use.
Design to have long life.
Proper utilization of the facility available.
Fixture for flexivity testing of MCCB Knobs
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Thank You !