A cone crusher is a compression crusher designed for secondary, tertiary, and quaternary crushing. It crushes rock by compressing material between a moving mantle and a stationary concave, producing high-quality aggregates for mining and construction.
Cone crushers are a type of compression crusher used by aggregate, coal, concrete, crushing, fracking sand, and mining industries, which reduces material by squeezing or compressing it until it breaks.Specifically, the material is compressed between an eccentrically rotating piece of steel, the mantle, and a stationary piece of steel, the bowl. The material works its way down along the crushing chamber as it gets smaller, until the crushed material discharges at the bottom of the machine. The final product’s sizing is determined by the gap setting between the two crushing members at the bottom also known as closed side setting.
Cone crushers are available in either a bushing, bearing and even a combination of roller bearing and sleeve bearings. The bearing cones run cooler and more efficient, allowing more applied horsepower to crushing rock than creating excess heat. The bushing cones require more lubricating oil and larger, more active oil coolers, but are less expensive to build and repair. The most often replaced parts in a cone crusher are the wear liners in the crushing chamber, which consist of the mantle and the bowl. When dealing with finer products, settings can be adjusted by adding a specialized liners, mantle, and concave ring that reduce the receiving opening and angularity between head and concave, allowing for a more specialized finished product.
Capacities and product gradations produced by cone crushers are affected by the method of feeding, characteristics of the material fed, speed of the machine, power applied, and other factors. Material hardness, compressive strength, mineral content, grain structure, plasticity, size and shape of the feed particles, moisture content will affect production capacities and gradations. Gradations and capacities are most often based on a typical, well-graded choke feed to the crusher. A choke feed is when the crusher cavity is kept full, without spilling out over the top of the crusher. A minimal feed is when the crusher cavity is kept fairly low, just enough to ensure the crusher continues to work. An anti-spin device can help with minimal or intermittent feeds.Cone crushers are offered in a variety of configurations in order to meet any producer’s crushing needs: liner configurations for larger or finer-sized material; minimal to choke feed for different crusher cavity volumes; stationary, track, and mobile (wheeled) crushers; and they can be used in the primary, secondary, tertiary, or quaternary position in the crushing circuit.
The operational mechanism of a cone crusher is based on the principle of compressive crushing, where material is repeatedly squeezed between the mantle and concave until it breaks along its natural fracture lines. Here’s a step-by-step breakdown of the process:
The spring cone crusher is the most traditional and time-tested type of cone crusher, suitable for crushing materials ranging from medium to ultra-high hardness, such as iron ore, granite, limestone, and river pebbles.
Compound cone crushers (also known as Symons cone crushers) are available in standard and short-head models. Generally, the standard type is used for coarse and medium crushing, while the short-head type is used for medium and fine crushing; consequently, compound cone crushers are not suitable for ultra-fine crushing or sand making. They are the most commonly used cone crushers in applications where strict control over product particle size is not required.
Multi-cylinder hydraulic cone crushers feature high crushing force, high rotational speed, and high yields of fine-fraction products. With relatively high crushing capacity, they are suitable for processing hard materials at high throughput rates.
Single-cylinder cone crushers (also known as single-cylinder hydraulic cone crushers) feature a streamlined, compact design and produce material with excellent particle shape. They are suitable for crushing hard and highly abrasive ores and rocks, particularly metal ores and construction aggregates.
Choosing the correct cone crusher depends on several practical factors rather than simply selecting the largest model.
| Material | Recommended Crusher |
|---|---|
| Limestone | Spring or Single-cylinder |
| Granite | Single-cylinder Hydraulic |
| Basalt | Multi-cylinder Hydraulic |
| Iron Ore | Multi-cylinder Hydraulic |
| River Stone | Single-cylinder Hydraulic |
Harder materials generally require hydraulic models because they provide greater crushing force and better wear resistance.
Cone crushers achieve interparticle (rock-on-rock) crushing when operated under choke feed conditions, improving product shape. This naturally creates highly cubical aggregates, which are strictly required for high-strength concrete and asphalt applications.
Modern cone crushers, particularly hydraulic models, are designed with top-down serviceability. Wear parts like the mantle and bowl liner can be replaced relatively quickly, minimizing plant downtime.
When an uncrushable object like a digger tooth enters the chamber, the crusher needs to protect itself. Both spring and hydraulic systems feature a tramp relief mechanism that momentarily opens the crushing chamber to let the metal pass, preventing catastrophic internal damage.
Many advanced cone crushers allow operators to adjust the eccentric stroke (the “throw” of the mantle). A larger stroke increases capacity, while a shorter stroke allows for finer, more precise crushing.
By simply changing the crushing cavity profiles (from extra-coarse to extra-fine liners), a single cone crusher base can be adapted to serve as either a secondary or tertiary crusher as your plant’s needs evolve.
By far, the most common application for cone crushers is in the mining industry. The mining industry is highly competitive, forever seeking ways to eke out extra efficiency where possible to save on production costs and maximize profit margins.
As a result, cone crusher technologies have advanced significantly, allowing mining and quarrying companies to crush huge amounts of material at once thanks to increased cone crusher capacities and crushing power.
Automation has also allowed for reduced power consumption and automatic fault detection, which ensures machine longevity. Moreover, hydraulic release capabilities ensure that uncrushable materials won’t get stuck in the machine and damage it or affect performance.
The application of cone crushers in quarrying is similar to mining, although the stakes are not quite so high. Quarrying is a much lower-cost industry than mining, but the volumes produced can still be extremely high. Cone crushers are well suited to high volumes. Typically, cone crushers in quarrying would be used to produce aggregates for construction. They are very good at crushing hard, abrasive rock but are not good at handling clays or metals.
Cone crushers are commonly used in recycling asphalt. Thanks to modern technologies, bitumen and aggregates can be crushed down and separated, allowing modern asphalt production facilities to produce new asphalt from 70% recycled materials.
Other construction and demolition materials can also be recycled by being crushed in a cone crusher.
With more than 30 years of manufacturing experience and projects in over 100 countries, UNIQUEMAC has found that selecting the correct crusher type has a greater impact on long-term profitability than simply choosing a larger machine. For example:
A small granite quarry with a production target of 120 TPH may achieve higher returns using a single-cylinder hydraulic cone crusher rather than investing in a larger multi-cylinder model.Conversely, a mining operation targeting 800 TPH will benefit significantly from the higher crushing force and automation of a multi-cylinder hydraulic cone crusher.
Our engineering team evaluates each project based on material characteristics, production targets, operating environment, and budget to recommend the most cost-effective crushing solution.
Q1: What is CSS in a cone crusher?
A1: CSS stands for Closed Side Setting. It is the minimum gap between the mantle and the concave liner, and it determines the discharge size, capacity, and liner wear.
Q2: Can cone crushers crush limestone?
A2: Yes. Cone crushers are widely used to crush limestone during the secondary and tertiary crushing stages. They produce more uniform aggregates and better particle shape than primary crushers, making them ideal for construction and road-building applications.
Q3: How often should liners be replaced?
A3: Liner replacement depends on material hardness, operating conditions, and production volume. In general, liners should be replaced when wear begins to reduce crushing efficiency or affect the desired product size.
Q4: What causes excessive liner wear?
A4: Common causes include uneven feeding, oversized feed material, incorrect chamber selection, and improper CSS settings. Maintaining a stable feed and selecting the right liner profile can significantly extend liner life.
Q5: What is choke feeding?
A5: Choke feeding means keeping the crushing chamber full of material during operation. This improves crushing efficiency, produces better particle shape, and reduces uneven liner wear.
Q6: How can I improve cone crusher capacity?
A6: To increase capacity, maintain a stable feed, keep the chamber full, select the correct crushing chamber, adjust the CSS properly, and replace worn liners on time. Regular maintenance also helps maximize performance.
Q7: What maintenance is required for a cone crusher?
A7: Routine maintenance includes checking the lubrication system, hydraulic pressure, liner wear, and oil temperature. Regular inspections and timely replacement of wear parts help ensure stable operation and extend equipment life.
Our experienced engineers can recommend the most suitable cone crusher based on your material type, feed size, required capacity, and budget. Contact UNIQUEMAC today to receive a free technical consultation and customized quotation.
