Introduction: To understand the feed size of the roll crusher, first introduce the roll crusher. Roll crusher is a kind of medium and fine crushing equipment widely used in mining, building m...

To understand the feed size of the roll crusher, first introduce the roll crusher. Roll crusher is a kind of medium and fine crushing equipment widely used in mining, building materials, chemical industry, metallurgy and other industries. It has the advantages of simple structure, convenient operation, large crushing ratio, high production efficiency, low energy consumption and even product size. In the ore crushing production line, the roll crusher can achieve the preliminary crushing and fine crushing of ore, which is one of the key equipments in the crushing production line. The design and manufacture of roll crusher fully consider the user’s production needs, using advanced manufacturing process and materials to ensure the stability and reliability of the equipment.

The main technical parameters of the roll crusher include:

Feeding size, discharging size, production capacity, motor power, rotating speed, roll diameter, roll width, and weight of the whole machine.

These parameters directly affect the performance and scope of application of the crusher. The feed size is usually between 50mm and 400mm, while the discharge size is adjustable between 5mm and 30mm according to user requirements.

1. Upper feed size limits by machine type

Small roll crusher: roll diameter 200-400mm, feed size is usually 50-150mm.
Medium-sized roll crusher: roll diameter 400-800mm, can handle materials of 150-300mm.
Large-sized roll crusher: when the roll diameter is more than 800mm, the feed size can be more than 500mm.

2. Key Influencing Factors

Relationship between roll diameter and feed size: the feed size is generally not more than 1/4 to 1/3 of the roll diameter. e.g. 600mm diameter roll corresponds to the upper limit of 150-200mm feed.
Material properties: High hardness or viscous materials need to reduce the feed size to ensure crushing efficiency.
Equipment design: Hydraulic adjustment of roll spacing or a pre-crushing function can increase capacity.

3. Differences in special types of equipment

Hydraulic Roll Crushers: Some models have an upper feed limit of ≤150mm (e.g. when processing marble, pebbles), but other designs may support feed sizes up to 3cm (30mm).
Conventional roll crushers: typical feed size is 5cm (50mm).