Method for adjusting secondary cooling water amount and roll gap value of double-flow slab casting machine

The invention discloses a method for adjusting the secondary cooling water amount and the roll gap value of a double-flow slab casting machine. In the double-flow slab casting machine, 12 cooling regions are formed for secondary cooling; 10 cooling water meters are provided; five grades, i.e., strong cooling: the secondary cooling water amount is 1.0-1.1 L/kg, medium cooling: the secondary cooling water amount is 0.8-0.9 L/kg, weak cooling: the secondary cooling water amount is 0.7-0.8 L/kg, medium-weak cooling: the secondary cooling water amount is 0.45-0.6 L/kg, and slight cooling: the secondary cooling water amount is 0.4-0.45 L/kg are divided to adapt to the cooling requirements of different types of steel respectively; the roll gap of a secondary cooling region support roll is consistent with the linear shrinkage rule of a casting blank from top to bottom, and decrease continually; and the roll opening between the outlet of a previous fan-shaped section and the inlet of a next fan-shaped section is kept