Stringer, which is the executive body of the string plant, is usually used on the declining coal seams (0-20°) with a thickness of 0,9-1,8 m with soft and medium hard coal. The stringline operates according to the shallow scheme, moving along the face at a speed of 33.6 m/min and higher. On the body of the screed are mounted soil advance and lower knives and cutters, which work in conditions of blocked and semi-blocked cutting ...

Mine No. 32 of the Snezhnyananthracite Trust, where the measurements were made, develops the H8 - Fominsky formation with a total thickness of 1.08-1.10 meters. The dip angle of the seam is 15°. The roof control is partial filling. The longwall face length is 167 m. The working mode is three-shift: two shifts are mining shifts and one shift is preparatory. Formation H8 is usually classified as anthracite of medium strength. However, the presence of a clearly pronounced jib and squeezing of the coal massif with a lowering roof allows us to refer it to the lower-middle strength: 0.04-0.05 pieces of KMZ-1 type victorite teeth are used to cut 1 m2. A Donbass combine harvester worked in the face. The total length of the bar was 1.6 m; useful length - 1.45 m; height - 0.83 m. There are three disks on the bar, as the anthracite is viscous and the target cut by the ring bar is not destroyed into transportable pieces. The cutting chain is set according to the scheme of a seven-line “herringbone” with an increased number of teeth in the extreme positions. Measurements were taken at the beginning of the cycle (at the pullback drift). All teeth in the cutting chain were tucked in and set according to the scheme. The pincers on the rod and teeth on the disks were made of carbon steel and reinforced with T-590 hard alloy.