Pitman of a jaw crusher, jaw crusher, crushing plant and crushing method

A jaw crusher for crushing mineral material comprising a pitman Which comprises an upper part comprising an upper supporting point for supporting the pitman in the body of the jaw crusher, and which pitman comprises a lower part comprising a lower supporting point for supporting the pitman in the body of the jaw crusher through a toggle plate, wherein the lower part of the pitman comprises first and second sidewalls extending from a front surface to a rear edge, and a forwards open honeycomb structure open in a crushing direction, which forwards open honeycomb structure comprises one or more cross-sectional supports reaching from the first sidewall of the pitman to the second sidewall, and a back wall area opposite the front surface, and wherein the upper part of the pitman comprises a backwards open structure located above the back wall area and open in a direction opposite the crushing direction.

A crushing plant comprising a jaw crusher with a pitman which comprises an upper part comprising an upper supporting point for supporting the pitman in the body of the jaw crusher, and which pitman comprises a lower part comprising a lower supporting point for supporting the pitman in the body of the jaw crusher through a toggle plate, wherein the lower part of the pitman comprises first and second sidewalls extending from a front surface to a rear edge, and a forwards open honeycomb structure open in the crushing direction, which forwards open honeycomb structure comprises one or more cross-sectional supports reaching from the first sidewall of the pitman to the second sidewall, and a back wall area opposite the front surface, and wherein the upper part of the pitman comprises a backwards open structure located above the back wall area and open in a direction opposite the crushing direction.

An apparatus for crushing mineral material in a jaw crusher or a crushing plant which jaw crusher or crushing plant comprises a crushing chamber, the apparatus comprising:

• a pitman arranged in the crushing chamber, the pitman comprising an upper part having an upper supporting point for supporting the pitman in a body of the jaw crusher, and a lower part having a lower supporting point for supporting the pitman in the body of the jaw crusher through a toggle plate, the lower part of the pitman having first and second sidewalls extending from a front surface to a rear edge, and a forwards open honeycomb structure open in a crushing direction which forwards open structure has one or more cross sectional supports reaching from the first sidewall to the second sidewall, and a back wall area opposite the front surface, the upper part of the pitman having a backwards open honeycomb structure located above the back wall area and open in a direction opposite the crushing direction,
• wherein a change in the openness of cross sectional profile of the pitman occurs where a linear distance taken along the sidewalls from the front surface to the rear edge is 80%-90% of a maximum linear distance taken along the sidewalls from the front surface to the rear edge.