Impact crusher and an upper rotor assembly

An impact crusher, comprising:

• a vertical shaft configured to receive a flow of material to be crushed;
• a lower rotor having a vertical axis, configured to receive the flow of material from the vertical shaft and to rotate to a first direction about the vertical axis for accelerating the flow of material;
• an upper rotor configured to rotate above the lower rotor to a second direction about the vertical axis;
• the upper rotor having a plurality of hammers extending down to rotate at a level of the accelerated flow of material;
• wherein the impact crusher further comprising:
• an upper rotor assembly having the upper rotor;
• the upper rotor assembly is connected to a lower rotor assembly having the lower rotor by an articulated joint;
• wherein the upper rotor assembly is configured to be tilted into a service position along the articulated joint;
• the upper rotor further including:
• a first disc;
• each of the plurality of hammers including a wear part and a support shaft, wherein the support shaft is connected from a lower position to the first disc;
• and
• a second disc at a distance above the first disc, wherein the support shaft is connected from an upper position to the second disc.