Composite lifting element of a grinding mill
A lifting element for a drum of a grinding mill to be used for grinding of ores and minerals. The lifting element is attachable to a frame of the drum and extending in the longitudinal direction of the drum. The lifting element includes a flexible body and a wear protection element located in the leading edge of the body with respect to the direction of rotation of the drum. The wear protection element includes at least two different parts manufactured of different materials having toughness and hardness different from each other.
1. A lifting element for a drum of a grinding mill to be used for grinding of ores and minerals, said lifting element being attachable to a frame of the drum and extending in the longitudinal direction of the drum, and said lifting element comprising a flexible body made of a polymeric material and a wear protection element located in a leading edge of the body with respect to a direction of rotation of the drum when attached thereto, wherein:
the wear protection element consists of at least two different parts, said parts being metallic reinforcements manufactured of different materials having a toughness and hardness different from each other, and
the part of the wear protection element manufactured of a harder material is located:
in a lower part of a leading edge of the part manufactured of a tougher material,
at least partly under the part manufactured of the tougher material, or
at least partly inside the part manufactured of the tougher material.
2. A lifting element according to claim 1 , wherein the part of the wear protection element manufactured of the harder material is located in the lower part of the leading edge of the part manufactured of the tougher material.
3. A lifting element according to claim 1 , wherein the part of the wear protection element manufactured of the harder material is located at least partly under the part manufactured of the tougher material.
4. A lifting element according to claim 1 , wherein the part of the wear protection element manufactured of the harder material is located at least partly inside the part manufactured of the tougher material.
5. A lifting element according to claim 1 , wherein at least one of the materials of the wear protection element is manufactured of raw-material produced with a powder metallurgic process.
6. A lifting element according to claim 5 , wherein the material manufactured with a powder metallurgic method is a powder metallurgic high-speed steel or a tool steel.
7. A lifting element according to claim 5 , wherein the material manufactured with a powder metallurgic method is a wear resistant composite material.
8. A lifting element according to claim 1 , wherein at least one of the materials of the wear protection element is a cast material manufactured by casting.
9. A lifting element according to claim 1 , wherein at least one of the materials of the wear protection element has been manufactured with deposition welding.
10. A lifting element according to claim 1 , wherein the materials of the wear protection element are joined with each other by temperature and pressure.
11. A lifting element according to claim 1 , wherein the materials of the wear protection element are joined with each other by an adhesive joint.
12. A lifting element according to claim 1 , wherein the wear protection element is a melt deposited element manufactured by melt deposition.
13. A lifting element according to claim 1 , wherein the wear protection is a cast element manufactured by a casting technique.
14. A lifting element for a drum of a grinding mill to be used for grinding of ores and minerals, said lifting element being attachable to a frame of the drum and extending in the longitudinal direction of the drum, and said lifting element comprising a flexible body made of a polymeric material and a wear protection element located in a leading edge of the body with respect to a direction of rotation of the drum when attached thereto, wherein:
the wear protection element consists of at least two different parts, said parts being metallic reinforcements manufactured of different materials having a toughness and hardness different from each other,
when viewed from a base of the lifting element, the wear protection element is divided into an upper part and a lower part, said parts being located substantially on top of each other, and
the upper part of the wear protection element is manufactured of a material having higher toughness and lower hardness than a material of which the lower part of the wear protection element is manufactured.