The double roll crusher is a mechanical device with a simple structure, high crushing efficiency, and uniform particle size. It is widely used in many industries. However, when selecting and using it, its advantages and disadvantages need to be considered comprehensively according to its own production needs and material characteristics.
A double roll crusher is usually followed by a primary or secondary crusher and is used for secondary and tertiary crushing of various minerals.
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The double-roller crusher has significant advantages in the crushing industry, and these advantages make it an ideal choice in a variety of application scenarios.
The double roll crusher, also known as a twin-roll crusher, is a high-efficiency crushing equipment composed of two counter-rotating crushing rollers. Material enters from the top between the two rollers and is crushed by compression, shearing, and splitting forces. This equipment uses high-quality alloy wear-resistant roller shells, ensuring a long service life. The crushing ratio is adjustable, and the output particle size is uniform. It is widely used in the coarse and fine crushing of various medium-hardness materials.
1. Frame: Made of high-strength steel, supporting the entire equipment structure.
2. Crushing Rollers: The core working components, including a fixed roller and a movable roller, with wear-resistant roller shells on the surface.
3. Transmission Device: Includes motor, reducer, coupling, gears, etc., providing crushing power.
4. Adjustment Device: Hydraulic or spring system, used to adjust the gap between the two rollers and control the output particle size.
Smooth Roll Crusher
double roller crusher
roller crusher
stone crusher
1. Simple structure, easy maintenance: The entire machine has a compact structure, occupies a small area, and requires simple daily maintenance and low maintenance costs.
2. Adjustable particle size, uniform output: By adjusting the gap between the two rollers, the output particle size can be controlled to meet different production needs.
3. Overload protection, safe and reliable: Equipped with a hydraulic or spring adjustment device, it can automatically retract when encountering uncrushable objects, protecting the equipment.
4. Wear-resistant and durable, stable operation: The roller surface is made of high wear-resistant alloy material, ensuring a long service life and stable and reliable equipment operation.
Roller crushers are used in mining to crush ores of various hardnesses, such as limestone, granite, iron ore, etc. Whether it is an open-pit mine or an underground mine, roll crushers can perform crushing operations well to meet the needs of mining production.
The working principle of a double-roll crusher is based on the crushing of materials by two counter-rotating crushing rollers:
1. The material falls into the gap between the two rollers from the feed opening.
2. Under the action of friction and gravity, the material is drawn into the crushing chamber.
3. The two rollers rotate in opposite directions, generating strong compressive and shearing forces on the material.
4. The material is crushed under pressure, and after reaching the desired particle size, it is discharged from below.
5. The gap between the two rollers determines the size of the output particles, and this gap can be adjusted by an adjustment device.
| Model | Roller Diameter (mm) | Roller Length (mm) | Feed Size (mm) | Capacity (t/h) | Motor Power (kw) |
| 2PG400×250 | 400 | 250 | ≤25 | 2-10 | 5.5×2 |
| 2PG610×400 | 610 | 400 | ≤30 | 5-20 | 15×2 |
| 2PG610×750 | 610 | 750 | ≤30 | 5-25 | 22×2 |
| 2PG750×500 | 750 | 500 | ≤35 | 10-40 | 18.5×2 |
| 2PG800×600 | 800 | 600 | ≤40 | 12-50 | 22×2 |
| 2PG800×800 | 800 | 800 | ≤40 | 20-60 | 37×2 |
| 2PG900×900 | 900 | 900 | ≤50 | 50-100 | 37×2 |
| 2PG900×1200 | 900 | 1200 | ≤50 | 60-130 | 45×2 |
| 2PGY1200×1000 | 1200 | 1000 | ≤50 | 70-140 | 75×2 |
| 2PGY1500×1000 | 1500 | 1000 | ≤80 | 80-150 | 132×2 |
| 2PG1800×1000 | 1800 | 1000 | ≤100 | 130-220 | 220×2 |
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Material is squeezed between two counter-rotating rolls, and the roll gap sets the particle size. Two ways to adjust it: mechanical (shims/thrust bearings) or hydraulic (hydraulic cylinders, with auto-retreat protection). Smaller gap = finer output. Finished size usually ranges from a few mm to ~20 mm. For very fine material, use toothed-roll or roller-press models instead. The exact range depends on the nameplate and manufacturer config.
It squeezes instead of striking. So there's less over-crushing, less dust, more regular particle shape (fewer flakes), and lower noise and wear-part costs. Great value on medium-hard materials like pebbles, quartz, coal, and sintered feed. Downsides: small feed opening and weaker against large blocks than a jaw crusher — usually needs primary crushing upstream.
They're high-wear parts. Life depends on material abrasiveness, hardness, mud content, shell material (high-manganese steel, hardfacing, high-chromium alloy), and assembly precision — it can vary several-fold even between sites of the same plant. To make them last: feed evenly, avoid eccentric loading and high-speed idling, keep the gap and rolls parallel, and hardface repair as soon as grooves appear instead of running the shell until it fails.
Yes, it can. Smooth rolls slip and get material stuck with high-moisture or high-mud feed, cutting throughput and giving uneven size. Fixes: use toothed or grooved rolls, add guide/sweeping devices, control feed moisture, or pre-screen the feed to remove fines and mud.
1. Lower output, coarser size — check whether the gap has worn wider and whether the belt is slipping.
2. Noise and vibration — usually tramp iron in the feed or shell pieces falling off; stop the machine and inspect immediately (on hydraulic models, check the safety retreat triggered).
3. Hot bearings — check oil level and whether dust is getting past the seals.
Rule of thumb: stop the machine first, then check the gap and wear, then lubrication and drive — never adjust under load.
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