Abstract: The present disclosure provides a method for controlling an amount of silicon added to ductile cast iron, a method for casting ductile cast iron, and a cast product, which relate to the technical fields of metallurgical and cast iron alloys. The method for controlling an amount of silicon added to ductile cast iron includes smelting ductile cast iron using scrap steel as a raw material. After the scrap steel is melted into molten iron, a copper alloy is added so that the molten iron has a copper equivalent of 0.8% to 1.0%, wherein the copper equivalent is controlled by formula (II). Then, ferrosilicon is added so that the content of silicon added to the molten iron satisfies formula (I).

Abstract: The disclosure provides a six-arm tunneling and anchoring machine, including: a tunneling system; a supporting system, wherein the supporting system is connected to the tunneling system, and at least part of the supporting system is able to be movably unfolded relative to the tunneling system, and when the six-arm tunneling and anchoring machine is in a supporting state, the tunneling system is lowered to touch a ground, and the supporting system is unfolded; a support working platform, wherein the support working platform is connected to the tunneling system, and at least part of the support working platform is able to be movably unfolded relative to the tunneling system. By means of the disclosure, the problems of long time and high labor intensity caused by the repeated forward and backward movement of water, electricity and air pipelines of a jumbolter in the related art are solved.