Hammer Crusher

Product Overview

About the Hammer Crusher

The hammer crusher is an impact-type crushing machine that reduces material by the high-speed impact of rotating hammers. A rotor fitted with hammers spins at 500-1,000 rpm inside a casing lined with impact plates. Material fed into the top is struck by the hammers, thrown against the impact plates, and further fractured — the combination of impact, shear, and collision rapidly reduces even large feed to the desired size in a single pass.

In cement plants, the hammer crusher is a popular choice for primary crushing of limestone — particularly when the limestone is moderately hard and the plant layout favors a simplified single-stage crushing circuit. It is also widely used for crushing coal, gypsum, chalk, and slag in power stations, building-material plants, and metallurgical facilities. The ability to achieve a high crushing ratio in one stage reduces capital cost, building height, and the number of transfer points.

LIMING hammer crushers feature robust rotors, high-chromium or forged-steel hammers, and wear-resistant liners. The discharge grate (grid) controls final product size — material remains in the crushing chamber until small enough to pass through the grate openings.

Classification

Types of Hammer Crushers

Hammer crushers are classified by the number of rotors and by the rotor configuration.

Single Rotor Hammer Crusher

One rotating rotor with hammers. The most common type for medium-capacity cement plants. Material is fed from the top and crushed by impact against hammers and impact plates. Simple structure, easy maintenance, economical. Available in reversible and non-reversible designs.

Double Rotor Hammer Crusher

Two counter-rotating rotors operating in parallel. Accepts larger feed size (up to 1,000mm+), achieves higher throughput, and performs two-stage crushing in a single machine. Ideal for large-capacity cement plants processing run-of-quarry limestone directly to mill feed size.

Specialized Variants

Ring Hammer Crusher: Uses ring-shaped hammers — ideal for crushing coal, coke, and brittle materials with low silica content. Generates less over-crushing fines.
Reversible Hammer Crusher: Rotor can rotate in both directions, allowing hammers to be used on both edges before replacement — doubling hammer service life and reducing downtime.

Key Benefits

Advantages of LIMING Hammer Crusher

Built for high-throughput, low-cost crushing of brittle materials in cement and power industries.

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High Crushing Ratio

Achieves crushing ratios of 10:1 to 20:1 in a single stage — reducing large limestone boulders directly to mill-ready size and eliminating the need for a secondary crusher.

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Simple Structure & Compact Size

Fewer moving parts than jaw and cone circuits. Compact footprint reduces plant height, building cost, and installation time — ideal for brownfield retrofits.

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Uniform Product & Grate Control

Discharge grate bar openings precisely control final product size. Material stays in the chamber until small enough to pass — ensuring consistent gradation for the raw mill.

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Easy Hammer Replacement

Hammers are mounted on the rotor with quick-release pins for fast replacement. Reversible designs use both edges before discarding, halving wear-part cost and downtime.

Technical Data

Hammer Crusher Specifications

Representative models for single and double rotor hammer crushers.

Model	Rotor Ø × Length (mm)	Max Feeding (mm)	Discharge (mm)	Capacity (t/h)	Motor Power (kW)	Weight (t)
Single Rotor Hammer Crusher — PC Series
PC-400×300	400×300	100	≤15	5-10	11	0.8
PC-600×400	600×400	200	≤15	10-25	22	1.5
PC-800×600	800×600	200	≤15	20-35	55	4.7
PC-1000×800	1000×800	250	≤20	30-60	90	7.2
PC-1000×1000	1000×1000	250	≤20	40-80	132	9.5
PC-1200×1200	1200×1200	250	≤25	80-120	185	15.0
PC-1400×1400	1400×1400	300	≤25	120-200	280	23.0
PC-1600×1600	1600×1600	314	≤25	180-280	355	31.0
Double Rotor Hammer Crusher — 2PC Series
2PC-1000×800	1000×800 (×2)	400	≤20	60-120	2×55	12.0
2PC-1200×1200	1200×1200 (×2)	450	≤25	150-250	2×132	28.0
2PC-1400×1400	1400×1400 (×2)	500	≤25	250-400	2×220	45.0
2PC-1600×1600	1600×1600 (×2)	600	≤30	400-600	2×355	62.0
2PC-1800×1800	1800×1800 (×2)	800	≤30	600-1,000	2×500	88.0
2PC-2000×2000	2000×2000 (×2)	1,000	≤30	1,000-3,000	2×710	120.0
Ring Hammer Crusher — PCH Series (Coal / Coke)
PCH-0808	800×800	200	≤20	30-50	45	3.5
PCH-1010	1000×1000	300	≤25	50-80	90	6.0
PCH-1216	1200×1600	300	≤25	100-200	220	14.0

* Specifications are for reference only. Actual capacity depends on material hardness, moisture, and grate opening. Contact LIMING for model selection.

How It Works

Working Principle of Hammer Crusher

The hammer crusher reduces material primarily by high-speed impact. The motor drives the rotor to spin at high speed; hammers mounted on the rotor strike the feed material, throwing it against impact plates and the casing wall. Here is the step-by-step process:

Material feed: Brittle material (limestone, coal, gypsum) enters the crushing chamber from the top feed hopper by gravity or via a vibratory feeder.
Hammer impact: The high-speed rotating hammers (500-1,000 rpm) strike the material with high kinetic energy, shattering it on impact. This is the primary crushing action.
Impact plate rebound: The shattered material is thrown at high velocity against the impact plates (breaker bars) lining the casing. The collision causes further fracture. The material bounces back toward the hammers for repeated impact.
Shear & friction: Between hammer strikes, material undergoes shear and friction against the grate bars and other particles, providing additional size reduction.
Grate discharge: Material that has been reduced below the grate bar opening size exits through the bottom grate. Larger fragments remain in the chamber for continued crushing until they reach the required size.
Tramp iron protection: If uncrushable metal enters, the hammers are designed to yield (or a safety coupling trips) to protect the rotor and motor from damage. A magnetic separator upstream is recommended.

Frequently Asked Questions

Hammer Crusher FAQ

What materials is a hammer crusher suitable for?

Hammer crushers are ideal for brittle, medium-hard materials with compressive strength below 150 MPa, including limestone, gypsum, coal, chalk, shale, and slag. They are not suitable for hard, abrasive rocks like granite or basalt, which would cause rapid hammer wear — a jaw or cone crusher is preferred for those materials.

What is the difference between single and double rotor hammer crushers?

A single rotor hammer crusher has one rotating rotor with hammers, used for primary or secondary crushing at medium capacities. A double rotor hammer crusher has two counter-rotating rotors, enabling higher throughput, larger feed size (up to 1,000mm), and two-stage crushing in a single pass — ideal for large cement plants processing run-of-quarry limestone.

How long do crusher hammers last?

Hammer life depends on material hardness and abrasiveness. For soft limestone, high-chromium or manganese steel hammers can last 2-4 months. For abrasive materials, life may be shorter. Reversible hammer designs and bi-metallic composites extend service life. LIMING supplies genuine replacement crusher hammers in various alloys to match your material.

Why choose a hammer crusher for limestone?

For limestone, hammer crushers offer a very high crushing ratio (up to 20:1) in a single stage, reducing large feed directly to mill-ready size. This simplifies the crushing circuit, lowers capital cost, reduces building height, and cuts energy consumption compared to multi-stage jaw + cone circuits. This is why many cement plants prefer hammer crushers for primary limestone crushing.

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