Details:
Confirming to IS 6495: 1984 : (Method of Tumbler Test for Iron Oxides: Lump Ores, Sinter and Pellets) / ISO 3271:2007 – Iron ores — Determination of tumbler strength
1. Tumbler Drum Assembly
Drum Construction:
- The apparatus shall consist of a cylindrical rotating drum having:
- Internal diameter: 1000 mm
- Internal length: 500 mm
- The drum shall be fabricated from steel plate of minimum 5 mm thickness.
- The drum shall be replaced when the wall thickness at any point is reduced to 3 mm due to wear.
Lifters
- The drum shall be fitted with two longitudinal lifters, positioned 180° apart.
- Each lifter shall be an angle section of 50 mm × 50 mm × 5 mm, securely welded over the full internal length.
- Lifters shall be oriented with the legs pointing towards the drum axis and opposite to the direction of rotation, forming a clear lifting shelf.
- Lifters shall be replaced when the effective shelf width reduces below 47 mm.
- The design shall prevent accumulation of material between lifters and drum shell.
Drum Door:
- The drum shall be provided with a flush-fitting door that forms a smooth, continuous internal surface.
- The door shall be rigidly secured during operation to prevent material loss or leakage.
Mounting & Drive:
- The drum shall rotate on stub axles welded to the drum ends using flanged construction to maintain a smooth internal profile.
- The apparatus shall be motor-driven with a minimum motor power of 1.5 kW, ensuring:
- Attainment of full operating speed within one revolution
- Uniform rotation
- Complete stopping within one revolution
Rotation & Control
- Rotational speed: 25 ± 1 rpm
- Total revolutions: 200
- The system shall be equipped with:
- A digital revolution counter
- An automatic shut-off mechanism after completion of preset revolutions
Installation Height:
- The height of the drum axis shall not exceed 700 mm from floor or receiving container level to avoid additional degradation during sample discharge.
2. Electrical Requirements
- Power supply: 230 V AC, Single Phase
- Total connected load: ≥ 1.5 kW
- Emergency stop and overload protection shall be provided.
3. Mandatory Sieves (as per IS 6495:2019) (At extra cost)
Square mesh sieves with the aperture size: 40 mm, 25 mm, 16 mm, 10 mm, 6.3 mm, 500 µm
4. Weighing Equipment
- 100 kg capacity balance, sensitivity ≤ 0.1%
- 20 kg capacity balance, sensitivity ≤ 0.1%
- 1 kg capacity balance, sensitivity ≤ 0.1%
5. Sample Preparation Accessories
Riffle Divider:
- A riffle divider with minimum 60 mm slot opening shall be provided for pellet samples up to 30 mm size.
Drying Equipment (External):
- Hot air oven capable of 105 ± 5 °C for drying test samples prior to testing.
- Sample receiving trays or bins
- Sample transfer shovels
- Dust collection hood (recommended for pellet abrasion testing)
- Calibration tachometer (for RPM verification)
- Wear thickness gauge (for drum & lifter inspection)
- Safety guarding and interlocks
- Spare lifters
- Spare drive belts / couplings