Introduction & working principle

Impact crusher working principle is mainly by the high speed rotation hammer bars to impact the materials, when material falls tangentially on to a rotor, running at 250-500 rpm, receiving a glancing impulse, which sends it spinning towards the impact plates.

The fractured pieces which can pass between the clearances of the rotor and breaker plate enter a second chamber created by another breaker plate,where the clearance is smaller, and then into a third smaller chamber.

Impact crusher gives a much better control of product size because there is less attrition. The product shape is much more easily controlled and energy is saved by the removal of particles once they have reached the size required. A great advantage in quarrying is in the fact that the impact crusher produces very good cubic products.
impact crusher

Structures

Impact Crusher is mainly composed of rotor, impact frame, main frame and transmission parts. Rotor is the key part of the impact crusher. The rotor frame is made of welded steel plate, and the hammer plates are fixed in the correct position, and the axial limiting device can effectively prevent the hammer plates from shifting.

The impact crusher is equipped with two impact frames, one at the front and the other at the back, both of them are self-supporting and suspended, each of them is individually supported on the crusher frame. The clearance between the impact frame and the rotor can be adjusted by the suspension bolts. The exchangeable impact liners are fixed on the impact frame with a tilt-up structure, and the impact liners can be replaced from the place where it is worn to the place where it is less worn.
impact crusher structure

Technical Parameter

The specification of the impact crusher is expressed by the rotor diameter D (actually the diameter of the circumference drawn on the end of the plate hammer) X rotor length L. For example, Φ1250×1000 single rotor impact crusher, indicates a rotor diameter of 1250 mm and a rotor length of 1000 mm.

Model Rotor size
(mm)
Feed opening
(mm)
Max feed
(mm)
Capacity
(T/H)
Motor
(KW)
Weight
(T)
PF-0607 Φ644×740 320×730 100 5-15 30 4.0
PF-0807 Φ850×700 400×730 200 10-25 45 8.0
PF-1007 Φ1000×700 400×730 250 25-45 37-55 9.2
PF-1008 Φ1000×800 400×830 260 30-50 55-75 10.5
PF-1010 Φ1000×1050 400×1080 300 50-80 75-90 14.0
PF-1210 Φ1250×1050 400×1080 300 70-120 110-132 17.0
PF-1214 Φ1250×1400 400×1430 300 130-180 132-180 21.0
PF-1315 Φ1320×1500 860×1520 450 160-250 180-250 25.0
PF-1320 Φ1320×2000 860×2030 500 160-300 300-375 30.0

Impact crusher features

1. It can crush ores and rocks with compressive strength of 250MPa.
2. Large crushing ratio, close to 20, simplifies the crushing process.
3. Low energy consumption, usually about 1kW/t per unit output, which reduces the production cost.
4. The product particle size is cubic, with less than 8 % of flakes, which can improve the quality of concrete.
5. It has the advantage of selective crushing, and can obtain more sand grade products.
6. It has excellent pass iron performance, and the main machine will not be damaged when non-breakable objects enter the crushing cavity.
7. Simple and reasonable structure of the whole product, easy to maintain and repair.
8. No significant unbalance vibration during working, no need heavy foundations.

Particle size and curve

Particle Size

The cubic shape of the finished granule is a significant advantage of the impact crusher. The excellent cubic shape of the aggregate particle size can improve the quality of concrete. Some special construction, such as airports, highways, water conservancy, etc., have high requirements for the flake content of the aggregate, which is less than 8%, the particle cubic size produced by the impact crusher can fully meet the high standards.

Highway construction aggregate(basalt) chemical composition

Note: this basalt compressive strength 266.7 MPa on average

Flaky particles content in the aggregate

Stone crusher plant process diagram with jaw crusher and impact crusher as follows, the whole process is simple and reasonable, it obtains excellent cubic shape gravels.

Particle curve

Impact crusher curve as follows
impact crusher curve

Wearing parts

For impact crusher, its wear-resistant material( mainly hammer plate, breaker plate) is crucial, Deya Machinery has developed a special high chromium cast iron material as the base material of the hammer plate, which has high hardness, high impact toughness and high wear resistance, comparing with the hammer plates imported from Germany, our wearing parts has reached high quality level.

Stone crusher plant