Knob Testing Fixture

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  • 1. Presented By:-
    VASUDEVANAND VINAYAK NANCHE
    V.J.T.I. Mumbai/ J.N.V. Sindhudurg
    Guided By:-
    Mr. MoKhan
    L&T Powai.
  • 2. M/S LARSEN & TOUBRO,
    POWAI - 400072
    Electrical & Electronics Business Group (EBG)
    Dept : Switchgear Quality Control & Reliability (SQR)
  • 3. Project
    Fixture for flexivity testing
    of plastic components
    i. e. Knobs used in all types of MCCB
    By – Vasudevanand Nanche
    SQR-QA
  • 4. Fixture for flexivity testing of MCCB Knobs
    Synopsis:-
    • What is fixture & flexivity?
    • 5. Need for fixture.
    • 6. Testing Components.
    • 7. Testing Machine.
    • 8. Temporary Arrangement.
    • 9. Disadvantage of Temporary arrangement
    • 10. Working principle of the Fixture.
    • 11. Design of fixture.
    • 12. Advantages of the Fixture.
  • Fixture for flexivity testing of MCCB Knobs
    • Fixture is the device that locates & holds component while testing.
    • 13. Flexivity refers to the absolute range of movement.
    • 14. It is the ability to flex or bend the component within a specified limit.
  • Fixture for flexivity testing of MCCB Knobs
    Need for designing the fixture
    • Requirement for permanent fixture on UTM
    • 15. Advantage over temporary arrangements
    • 16. Load Vs Displacement values
    • 17. Regular testing
  • Fixture for flexivity testing of MCCB Knobs
    Testing Components:-
  • 18. Fixture for flexivity testing of MCCB Knobs
    Testing Machine :-
    Ram
    [Place for Fixture]
    UNIVERSAL
    TESTING
    MACHINE
    [ UTM ]
  • 19. Fixture for flexivity testing of MCCB Knobs
    Temporary Arrangement:-
  • 20. Fixture for flexivity testing of MCCB Knobs
    Disadvantages of the Arrangement:-
    • Load Vs Displacement values are vary; because the clearance present is more.
    • 21. Diff-diff arrangements are required for all types.
    • 22. Time consuming test.
  • Fixture for flexivity testing of MCCB Knobs
    Polarity Testing Setup
    Working Principle
    Component 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 for
    Load Vs Displacement.
  • 23. Fixture for flexivity testing of MCCB Knobs
    Design of fixture:-
    Guiding System
    Vice Pin
    (Moving)
    Bush
    Pin
    Rod
    (Fixed)
    Vice Moving Part
    Knurled at Lower Surface
    Vice Main Body
    (Moving)
    Base
    (Fixed on Ram)
  • 24. Fixture for flexivity testing of MCCB Knobs
    Advantages of the Fixture:-
    • Flexivity i. e. load Vs Displacement values of the Knob can be accurately found out.
    • 25. Used for all the types of MCCB i. e. Multi purpose.
    • 26. Save time for testing.
    • 27. Safe & easy to use.
    • 28. Design to have long life.
    • 29. Proper utilization of the facility available.
  • Thank You !