Download - Knob Testing Fixture

Presented By:-

Guided By:-

VASUDEVANAND VINAYAK NANCHE

V.J.T.I. Mumbai / J.N.V. Sindhudurg

Mr. MoKhanL&T Powai.

Electrical & Electronics Business Group (EBG)

Dept : Switchgear Quality Control & Reliability (SQR)

By – Vasudevanand Nanche

SQR-QA

Project

Fixture for flexivity testingof plastic components

i. e. Knobs used in all types of MCCB

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

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.


Need for designing the fixture

Requirement for permanent fixture on UTM

Advantage over temporary arrangements

Load Vs Displacement values

Regular testing


Testing Components:-


Testing Machine :-Fixture for flexivity testing of MCCB Knobs

Ram[Place for Fixture]

UNIVERSAL

TESTING

MACHINE

[ UTM ]

Temporary Arrangement:-


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.


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.



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

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.


Thank You !