Abstract:

The consumption quantities of HBW and EP2 of the main bearing of a shield are too high. The ratios between the actual consumption quantities of HBW and EP2 and the theoretical values are 2.6 and 3.1 respectively. The reasons for the high grease consumption quantities are analyzed in terms of the sealing structure of the main bearing, the principle of the grease injection system, the setting of the grease injection control program, the layout of the grease injection circuit and the performance of the grease injection devices. It is concluded that the improper design of the grease injection control program and the improper setting of the pressure of the grease pumps are main reasons for the high grease consumption quantities. Furthermore, optimization measures are proposed to reduce the grease consumption quantities. The paper can provide reference for shield users and shield manufacturers. 

Key words: main bearing, grease, consumption, optimization measures