The working condition of the bridge crane is more complex, so the electric drag of the reuse motor, lifting mechanism and moving mechanism is higher. The following is a small series for you to sum up the 8 points of attention:
Select a special lifting motor. At present, the wire-wound induction motor is selected. Have a reasonable speed of rise and fall. No load, light load requires fast speed, in order to reduce the auxiliary working hours; heavy load requires slow speed 39bet-xì dách-phỏm miền bắc-tiến lên miền bắc-xóc đĩa-game bắn cá. It has a certain speed range. For ordinary crane speed range is generally 3:1, the higher requirements can reach (5-10) :1. Low speed is required to begin lifting or to lower the weight to a predetermined position. In order to meet the requirements, the bridge crane should be divided into several levels within 30% rated speed for flexible operation. The first level of promotion is the reserve level.
This is to eliminate the transmission clearance, tensioning the wire rope to avoid excessive mechanical impact. So the starting torque can not be large, generally limited to less than half of the rated torque. When the weight is lowered, according to the load size, the torque of the drag motor can be electric torque, can be brake torque, the conversion between the two is automatic. The braking device uses electrical and mechanical dual braking. There are perfect electrical protection and interlocking links.