thyssenkrupp impact crushers for the aggregates and mining industries
Wherever medium-hard and hard rock is processed into gravel, chippings or sand, impact crushers from thyssenkrupp can contribute to efficient operation.
Typical applications are the crushing of limestone, dolomite, gypsum and phosphates as well as the crushing of demolition waste and asphalt. The compact design allows the use in stationary as well as in semi-mobile and mobile plants. Impact crushers from thyssenkrupp are characterized in particular by a high crushing ratio and a cubic, low stress product. Due to the high crushing ratio from 1:10 to 1:20, the use of impactors compared to other crushing concepts often saves one crushing stage of the overall processing plant compared to other crushing concepts.
Design and function of the thyssenkrupp impact crushers
The core of the impact crusher is the fast-rotating rotor, which operates in a housing protected by wear plates. The crushing process and thus the product can be significantly influenced by changing the rotor speed as well as by adjustable impact aprons in the housing.
The material is fed through the feed opening into the crusher and is hit by the blow bars fixed in the rotor. Here the material is crushed by the large kinetic energy of the blow bars hitting the rocks. The material is crushed at the natural fracture surfaces and thrown against the first or second impact apron, where it is crushed further. From here, the material is deflected to the impact circle of the rotor. This process is repeated until the crushed material passes through the adjustable gap between the impact apron and rotor and is finally discharged through the bottom of the machine. The impact aprons of the crusher can be adjusted hydraulically from the outside. This enables the crushing chamber to be quickly adapted to the operator's requirements. When non-breakable tramp metal enters the crushing chamber, the impact aprons retract to the rear wall of the housing. Optionally, a grinding path can be installed in primary and secondary impact crushers, which introduces a further crushing stage in the machine. Essentially, the grinding path limits the maximum grain size of the product and produces a product with high cubicity. The product from impact crushers ensures high stability in road construction and concrete due to its cubicity and absence of cracks and residual stress.
Strong in coarse and fine crushing
The thyssenkrupp impact crusher portfolio comprises three product lines: primary, secondary and tertiary crushers, which differ in size, design and equipment options. This enables the selection of the right crusher for every application.
thyssenkrupp primary impact crushers
The big primary crushers are suitable for large feed sizes and capacities. Feed lumps with volumes of up to 2.5 m³ can be processed and crushed down to a final grain P95 < 120 mm. If an additional grinding path is used, a finer product of P95 < 80 mm can be achieved.
thyssenkrupp secondary impact crushers
The secondary crushers are fed with pre-crushed material with a size of 150 to 280 mm which can be crushed down to a size of -35 mm. Harder rocks such as granite or basalt can also be processed. Secondary impact crushers can also be equipped with a grinding path.
thyssenkrupp tertiary impact crushers
Tertiary crushers are used for the production of sand and chippings. They are operated at very high rotor speeds. Some rotors are fitted with only two impact bars to ensure that the material fully penetrates into the rotor's impact circuit. For example, it is possible to produce sand with a product size of -4 mm out of -20 mm feed material.
Minimum maintenance with maximum safety
The operation of fast-rotating crushers inevitably results in wear. In the case of impact crushers, this occurs mainly on the blow bars, the impact aprons, eventually on the grinding bars and on the wear liners inside the housing. This is where good accessibility to the wear-intensive areas of the crusher and good, risk-free handling of the parts to be replaced are particularly important. The entire upper part of the housing can therefore be opened hydraulically, providing service personnel with convenient and safe access to the crushing chamber and rotor. When handling heavy parts, the focus is on safety aspects. For this purpose, safe and user-friendly devices are provided for fast and safe replacement of wear parts.
Advantages of thyssenkrupp impact crushers
For the production of gravel, chippings and sands, especially on the basis of limestone, impact crushing represents the optimum form of processing. Impact crushers are used worldwide as single machines or within complex processing plants. They produce the ideal aggregates for road construction and concrete. The main advantages of these crushers are among others:
- High crushing ratio
- Cubic, low-stress and crack-free product
- Good adjustability of the product curves
- Constant product quality
- Easy maintenance