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The
purpose of this equipment is to provide both ultrasonic and eddy
current inspection of tube and bar products. The ultrasonic inspection
is achieved using a Heliscan rotating ultrasonic probe unit. The
eddy current inspection can be either a rotating eddy current probe
or an encircling coil.
3
Pinch roll drive units
Heliscan
rotating ultrasonic probe unit
Rotating
eddy current probe or encircling coil
Elevating
and sliding tables for eddy current and ultrasonic test heads
Mechanical
handling can include, unscrambling, Loading, conveyance,
Flaw Marking and unloading to separate Accept and Reject collectors
Heliscan
Rotating Ultrasonic Probe
The
Heliscan rotating probe units incorporate a compact rotating, water
filled annulus into which up to 9 ultrasonic probes can be fitted.
Probes can be used for longitudinal, transverse and oblique shear
wave inspection plus compression wave for thickness and lamination
testing. The rotating annulus is fitted to one end of the main rotor
which results in good access to the probes, testing close to the
product ends and tolerant to product straightness. The unit is normally
supplied with a variable speed drive for up to 2000 RPM maximum.
The
complete size range of the unit is covered by three interchangeable
annuli and, for each nominal product diameter, a set of four guides
is required.
The
ultrasonic probes are based on standard compression probes which
are fitted into a main body. A range of beam profiles and frequencies
are available.
The
general specification for the Heliscan is:
- Diameter
Range - 6mm to 100mm outside diameter
- Rotation
Speed - Continuously variable from 500 to 2000 RPM
- Number
of Probes - Maximum 9 located in rotating annulus
- Probe
Adjustments -
- Angular
adjustment from -2o to +20o nominal
- Transverse
probes are pre-set for material
- Fully
adjustable options are available
- Number of
Annuli - Three: 6 to 35mm, 35 to 70mm and 70 to 100mm diameter
- Location
Guides - For each nominal diameter - inlet guide, outlet guide
plus two annular rings
- Signal Transmissions
- Slip rings and brushes, using two rings per probe
- Rotor Bearings
- Mechanical bearings
- Water System
- Re-circulating water system with heating and filtering
- Water Purging
- Inlet and outlet water removal facilities
- Proximity
Detectors - On inlet side for end inhibit facility
- Untested
Ends - Front end up to 600mm and the rear end 40mm, typically
Mechanical
Handling Systems
The
Heliscan is incorporated into a diabolo roll type linear conveyor
system. These systems are modular in construction for varying product
diameters, lengths and weights. Inlet and outlet conveyor rolls
can be driven or idler roll units with the main pinch roll drive
units located in the central area. Systems can also incorporate
eddy current testing units, which can be either rotating eddy current
probes or encircling coil. Also diameter gauges and flaw position
marking units may be provided.
Typical
facilities include:
- Inlet roll
down rack
- Stack catchment
arms
- Unscrambler
units
- Diabolo roll
inlet track
- Diabolo roll
outlet track
- Tension strap
or fabricated collectors
- Central testing
area with pinch roll drive units, locations for Heliscan
rotating ultrasonic probe and other test units
- Integral
re-circulating water system
- Electrical
control desk with PLC unit for automatic and manual system operation
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