Belt conveyor drive reducer in use often encounter some drive reducer input shaft broken shaft, to the user's production have been affected. Usually just the broken shaft input shaft off, and the output shaft does very little off-axis. Serious input shaft have been incidents of off-axis phenomenon occurred in a few belt conveyor. This would happen all the broken shaft reducer is the case with a belt conveyor suppliers. Off when a broken axle shaft rear axle breaks stubble is generally flush with the cross-section is generally perpendicular to the length direction of the axis. The mobile machinery belt conveyor and ground belt conveyor will occur broken shaft.
1 the external main reason of the broken shaft should include the following aspects:
1.1 Selected reducer belt conveyor carrying capacity is not enough, both belt conveyor drive reducer selected too small, when the belt drive in a certain period of time after the actual use of power reducer exceed the carrying capacity of the reducer reducer off axis;
1.2 is usually installed between the motor shaft and reducer shaft coupling and brake wheel, brake wheel and hydraulic coupling of dynamic balance is not good, the eccentric serious belt conveyor will run great vibration . When vibration load reaches a certain level in the gear unit output shaft of the excessive stress fracture;
1.3 Installation of concentricity deviation is too large. Install fluid coupling between the motor and reducer and brake wheel should carefully adjust the concentricity between the reducer and motor shaft also occur if the deviation is too large coupling and brake wheel running generated when a shock and a broken shaft.
1.4 reducer design defects cause the input shaft broken shaft. This situation occurred in full accordance with the requirements of the supplier of the reducer belt conveyor design and selection of the reducer. The selected deceleration machine suppliers meet reducer requirements, but the phenomenon of the broken shaft.
2 reducer broken shaft of internal factors mainly include the following aspects:
The 2.1 reducer design when the shaft breaks too much stress;
2.2 reducer input shaft at the shaft shoulder without careful consideration of the fillet radius of curvature and the curve of the stress concentration severe fatigue damage;
2.3 reducer form of vertical axis, the first stage bevel gear shaft, an input shaft for the transition in the bevel gear at the support bearing shaft shoulder appears more severe stress concentration and fatigue failure;
2.4 reducer Hardened reducer input shaft diameter smaller, although the calculated intensity by itself is very thin due to shaft, the same shaft diameter changes at severe stress concentration and fatigue failure;
2.5 substandard quality of the input shaft of the heat treatment;
2.6 input shaft material selection is improper.
3 to avoid the methods and measures to reduce the speed reducer shaft broken shaft
3.1 modify the the deceleration machine's design;
3.2 installation and maintenance attention to adjust the concentricity of the motor and reducer, to the conventional requirements;
3.3 can be used when the parallel shaft gear unit, preferably without using the vertical axis of the reducer;
The 3.4 use reducer consider or calculate radial load reducer permission can withstand;
3.5 in the selection of the motor speed should be as much as possible to choose a six pole motor, both synchronous speed of 1000 rev / min motor as the drive motor, thus reducing the coupling, the vibration of the brake wheel when rotating at high speed, especially for larger power the belt conveyor, such as the power greater than 90kW belt conveyor best selection of low-speed electric motor, the higher the price of motor corresponding to the ratio of the price of the four-pole motor;
3.6 seek to reduce or control the size of the fluid coupling and brake wheel unbalanced moment.
Belt conveyor can be found or resolved by the above method is basically driven reducer input shaft broken shaft. Work frequent belt conveyor system should be properly equipped with the necessary speed reducer spare parts in order to avoid affecting the timely replacement of normal production.