Impact Crusher VS Hammer Crusher

Impact Crusher VS Hammer Crusher

Impact crusher and hammer crusher both use impact principle to crush materials, and the finished material has excellent particle shape. From the appearance, impact crusher and hammer crusher are similar, but they are different in many aspects, so which is better?

This article will introduces the differences of impact crusher and hammer crusher from the structure, working principle and applications etc..

  • 1. Different Structure
  • The impact crusher is mainly composed of hammerhead, main shaft, impact plate, rotor, frame and grate bar. Several rows of hanging hammers are arranged on the main shaft of the impact crusher.

    Hammer crusher is divided into single rotor and double rotor. The main body is composed of box, rotor, hammer head, impact lining plate, sieve plate, etc. it can directly crush the material with the maximum particle size of 600-1800 mm to 25mm or below.

    Impact Crusher VS Hammer Crusher
  • 2. Crushing Chamber
  • The impact crusher has a large crushing chamber, which makes the material have a large space of activity and makes full use of the impact effect.

    In contrast, the crushing chamber of hammer crusher is smaller, the impact effect cannot be fully exerted, and the impact crusher is of multi chamber crushing structure, so the crushing is more sufficient.

  • 3. Plate Hammer & Hammer Head
  • The plate hammer and rotor of the impact crusher are rigidly connected. The inertia of the whole rotor is used to impact the material (free crushing, impact crushing, milling crushing), so that materials can not only be crushed but also obtain a larger speed and kinetic energy. The plate hammer is used to smash the input material from the bottom to up and throw it onto the upper impact plate.

    The hammer head of the hammer crusher is used to crush the material (free crushing, impact crushing), and the speed and kinetic energy obtained by the material are limited. The hammer head striking materials along the material falling direction, with small crushing effect.

  • 4. Wear Resistance of Wearing Parts
  • The wear of impact crusher plate hammer often occurs on the side that facing the materials, and its metal utilization rate can be as high as 45% – 48%. When crushing limestone, the plate hammer of impact crusher is not seriously worn, but when crushing granite (with high hardness, it can be broken by cone crusher), the plate hammer needs to be replaced constantly.

    The hammer head of hammer crusher is in a suspended state, and the wear occurs at the top, front, back and side. Compared with plate hammer, the hammer head is more seriously worn, the metal utilization rate of hammer head is about 35%, and the rotor may also be worn.

    In addition, if the bottom sieve plate of hammer crusher is seriously worn, all the screens should be replaced, and the replacement of sieve plate is complex.

    Impact Crusher VS Hammer Crusher
  • 5. Output Size Adjustment
  • Hammer crusher controls the particle size of the material through the castor bar installed at the bottom.

    The impact crusher has no sieve structure such as castor bar, and it controls the separation of particles by adjusting device.

  • 6. Materials with Water Content
  • The feeding chute and the counterattack plate of the impact crusher can be equipped with heating device to prevent the material from binding, so the material with large water content can be crushed and the blocking is not easy to occur.

    Hammer crusher can’t prevent material from sticking by heating and can’t crush material with high moisture content.

  • 7. Material Blocking
  • The impact crusher is not easy to block the material. First, it can be equipped with heating device to prevent the material from blocking due to sticking. Second, there is no grate bar at the bottom. The product size is determined by the gap between the impact plate and the plate hammer. Therefore, when handling the material with too much water content, it can avoid blocking the grate bar when crushing the wet material.

    Hammer crusher is equipped with bottom sieve plate, which increases the probability of blocking.

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