Belt conveyor drive reducer is often encountered in the use of some of the input shaft drive gear broken shaft, and give the user the impact of the production to a certain extent. Off-axis is usually only broken input shaft, while the output shaft is indeed very little off-axis. In severe cases occur on the conveyor belt in a few input shaft broken shaft after another phenomenon occurred. This situation occurs in all took place off the shaft reducer with a belt conveyor supplier circumstances. In the off-axis broken rear axle shaft breaks in the Crops tend to be more aligned, the cross-section generally perpendicular to the axis length. In the mobile machine on a conveyor belt and ground occurs on a conveyor belt of broken shaft.
　　1. Off-axis external main reasons should include the following aspects:
　　1.1 The selected belt conveyor carrying capacity of the reducer is not enough, both driven by conveyor belt reducer selection is too small, when the reducer of the actual use of power than the carrying capacity of gear after a certain time so that belt-drive gear off axis;
　　1.2 In the motor shaft and the reducer shaft is usually installed between the fluid coupling and the brake wheel, when the brake wheel and hydraulic coupling of the dynamic balance is not good, eccentric serious run-time conveyor belt will have a huge vibration. When the vibration load reached a certain degree so that the stress reducer output shaft too large fault;
　　1.3 installation of concentricity deviation is too large. If you install the motor and reducer between the fluid coupling and the brake wheel adjustment should be a careful look at reducer and the concentricity between the motor shaft, if the deviation is too large may also occur, and brake wheel couplings generated at run time excessive vibration occurs off-axis.
　　1.4 reducer design their own shortcomings led to broken input shaft axis. This took place in full accordance with the requirements of gear supplier to design the conveyor belt when the choice of reducer. Although the selected gear reducer to meet the requirements of suppliers, but still occurred in the phenomenon of off-axis.
Two off-axis reducer internal factors include the following aspects:
　　2.1 reducer shaft breaks in the design stress is too large;
　　2.2 reducer input shaft axis does not carefully take into account the shoulder of the transition fillet radius of curvature and changes in the curves so that stress concentration is a serious outbreak of fatigue damage;
　　2.3 reducer for the vertical axis form the first level of the input shaft bevel gear shaft, the bevel gear shaft supporting bearing at the shoulder appears at the transition to more serious stress concentration and fatigue failure occurs;
　　2.4 reducer for Hardened reducer, reducer input shaft diameter and smaller, although the calculation of intensity adopted, due to shaft itself is fine, the same change in shaft diameter, the stress concentration and caused severe fatigue damage;
　　2.5 the input shaft of the heat treatment of inferior quality;
　　2.6 improper selection of material input shaft.
　　3 to prevent and reduce the reducer shaft broken shaft means and measures
　　3.1 modify the design of speed reducer;
　　3.2 installation and maintenance, motor and reducer to adjust the concentricity to reach the normal requirements;
　　3.3 can use the parallel axis gear is best not to use the vertical axis of the reducer;
　　3.4 The selection of gear reducer to consider licensing or calculation that can withstand the radial load;
　　3.5 in the selection of motor speed should be as much as possible to choose the six-pole motors, both 　　synchronous speed of 1000 rev / min motor as a drive motor, thus reducing the coupling, brake wheel vibration when rotating at high speed, especially for large power belt conveyor, such as the power greater than 90kW the best use of the belt conveyor low-speed motors, motor prices at this time than the corresponding four-pole motor is higher prices;
　　3.6 seek to reduce or control the fluid coupling and the brake wheel the size of the imbalance torque.
　　Basically, by the above method can be found or solve the belt conveyor drive reducer input shaft of the broken shaft problem. Frequently in the work of belt conveyor systems should be properly equipped with the necessary gear spare parts for the timely replacement in order to avoid affecting the normal production.