Designation of an MMD Mineral Sizer
Each sizer, ranging from the 500 series to the 1500 series is specially manufactured to satisfy the project requirements. Below are the characteristics of an MMD sizer, which identify its design:
Centre Distance of Shafts
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This is the measurement, in millimetres, between the centre line of the two shafts. It is the main designation of an MMD sizer and is often referred to by the series number i.e. 500 series sizer = 500 mm centre distance (centres).
This distance, combined with the tooth design and configuration, controls the maximum size of input material that the unit is able to process efficiently. |
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Length of Inlet
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The length of inlet is the length of the sizing chamber in millimetres.
This length is a major factor in the volume of material that the unit is able to process.
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Tooth Configuration
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The tooth configuration in conjunction with a breaker bar, when fitted, controls the product size.
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Breaker Bar
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The adjustable breaker bar, when fitted, is bolted underneath the shafts and can be moved up and down to create an additional stage to the breaking process.
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Inward / Outward Shaft Rotation
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This is the standard method of operation for most types of tooth configuration and must be used on wet/sticky materials.
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Outward running is usually only employed on secondary machines for certain materials and is done in order to produce a smaller product than is possible with running inwards.
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Breaker Combs
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Breaker combs are static teeth which protrude from the side plate into the sizing chamber, and fit snuggly around and between the sizing teeth. Usually fitted in wet and sticky situations, the breaker combs act as a continuous cleaning system and prevent the teeth from clogging, as well as optimizing sizing efficiency. Cleaning combs are also able to act as reversing combs. |
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Reversing Combs
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These are shaped static blocks which protrude from the side plate into the sizing chamber, and nestle between the sizing teeth. Reversing combs prevent oversize material from passing through the sides of the machine. In the event of reversing, the shafts eliminate the problem of material being jammed between the side plate and the teeth.
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