Impact Crusher

What is the Impact Crusher?

An impact crusher breaks material by throwing it against rotating or fixed anvils using high-speed blow bars. It gives high reduction ratios and good product shape on medium-hard, low-abrasion feed in sample preparation.

Overview

An impact crusher uses rapidly rotating blow bars to strike the feed and project it against impact plates or against other particles. Breakage occurs by impact and by the subsequent collisions, so reduction ratios are high and the product is angular and relatively uniform. Rotor speed, blow bar clearance and the position of the impact plates control product size and gradation. The design suits medium-hard, low-abrasion materials such as limestone, concrete and some ores, and is used where product shape matters or where a high reduction ratio must be achieved in one stage. Abrasive feed accelerates wear of the blow bars and impact plates.

How does it work?

Crushers apply mechanical forces that exceed the strength of the feed material, causing it to fracture. Jaw crushers press material between a fixed and a moving jaw, roll crushers draw it between counter-rotating cylinders, cone crushers squeeze it in a gyrating chamber, hammer crushers strike it with rotating hammers, and impact crushers break it against a rotating or fixed anvil. The reduction ratio, feed size and product size depend on the machine geometry, the gap setting and the material hardness. Crushing is normally the coarse stage that prepares feed for a mill, and over-crushing is avoided because fines can complicate later handling. Wear parts are made from hardened steel or manganese alloys to resist abrasion.

What are the key features?

• High-speed blow bars for impact breakage
• Adjustable impact plates for size control
• High reduction ratio in a single stage
• Angular, relatively uniform product shape
• Rotor speed control for gradation

What are the technical specifications?

A typical impact crusher configuration offers max feed size of 50 mm, product size of 1–15 mm, adjustable, throughput of Up to 350 kg/h, rotor speed of 1,500–3,500 rpm, blow bar material of High-chromium alloy steel and impact plates of Adjustable, two-stage. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Impact Crusher is used in limestone and aggregate sample preparation, concrete and construction material recycling, ore sample reduction before milling and product shape sensitive applications. Across the wider Crushers class, laboratories also deploy it for mining and ore sample preparation, cement and clinker analysis and geological and soil sample reduction.

Which standards and certifications apply?

Relevant standards and methods include ISO 3310-1, ASTM E11, ISO 2591-1, IEC 61010-1 and ISO 6497. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install crushers on a firm floor with the necessary electrical protection and, where required, dust extraction and noise enclosure. Do not exceed the rated feed size, since oversized pieces can jam the machine or damage the jaws. Feed material gradually and avoid running the crusher empty for long periods. Check and replace wear parts on schedule, and clean thoroughly between samples to avoid cross-contamination, using a blank or quartz flush where trace analysis demands it. Follow lock-out procedures during maintenance and guard all moving parts.

How do I select the right Impact Crusher?

Select an impact crusher for medium-hard, low-abrasion feed where a high reduction ratio or a favourable product shape is required. Confirm the adjustment range of the impact plates gives the required product size and that the blow bar material suits the abrasiveness. In an RFQ state feed size, product size, throughput and material abrasiveness.

How does it compare with other Crushers variants?

Choose a crusher according to the feed size, hardness and abrasiveness of the material and the required product size. Jaw crushers suit hard, brittle lumps and give a fairly uniform product with adjustable gap. Roll crushers suit medium-hard, brittle material and produce less dust. Cone crushers handle high throughput of hard material. Hammer and impact crushers suit softer, less abrasive materials and give higher reduction ratios. Confirm that the feed opening accepts the largest pieces, that the reduction ratio matches the required downstream size, and that the crushing chamber and wear parts suit the abrasiveness. Consider dust control, sample representativeness and cleaning between samples.