The cross-sectional size and shape of the patio depends primarily on its use and the number of compartments. The cross-sectional shape is usually rectangular, and the slip and ventilation shafts are often circular. The diameter of the circular patio is generally about 2m. The rectangular patio often uses the length of the ladder as the short side of the patio section, generally 1.5~2m. The long side of the rectangular patio is determined by the number, arrangement and size of the grid, generally 2.0~2.5. Around m, the size of the ladder is determined according to the requirements of the safety regulations. The shortest side of the mine should be more than three times the maximum block size of the ore. The lifting equipment should ensure the smooth passage of materials and equipment. PP,PE plastic pelletizing machine PP,PE plastic pelletizing machine,High Quality PP,PE plastic pelletizing machine,PP,PE plastic pelletizing machine Details, Zhangjiagang Wuhe Machinery Co., Ltd. Shandong Qufu Xingbang Heavy Equipment Co., Ltd. , http://www.chinaxingbangheavyindustry.com