Shot blasting machine motor failure analysis and maintenance method

       Whether the electric actuator of the shot blasting machine can operate reliably, and whether it can complete the specified functions within the specified time and under the specified conditions, the key lies in its performance indicators. The performance index is generally expressed by the mean time between failures MTBF, which includes parameters such as basic error, hysteresis, damping, and dead zone. These parameters reflect to some extent the performance of the electric actuator of the shot blasting machine.

    Main performance indicators and current problems

The relevant technical parameters of the electric actuator of the shot blasting machine: the number of input channels is 1, the resistance is 250Ω, the basic error is 1%, the hysteresis is 1.5%, the dead zone is adjustable from 0.5% to 3%, and the damping characteristics are not disturbed. Although some technical parameters of electric actuators can be compared with foreign counterparts, due to the restriction of the imperfect operating mechanism of domestic production enterprises, there are also the following drawbacks:

(1) Ignore the research and development of basic technology of shot blasting machine;

(2) The quality of the general components of the shot blasting machine is not high;

(3) The enterprise has lax quality management of shot blasting machine production.

Failure analysis

(1) Early stage of shot blasting machine operation

The initial period of operation is a running-in period. The faults that occurred during this period are more complicated, and the reasons are also various, such as selection problems, design and manufacturing problems, or installation and environmental problems. If the torque is selected too small, it may affect its adjustment speed or even impossible to adjust at all.

There are the following in practical applications: the design did not pay attention to the firm connection between the connecting rod and the actuator, and the phenomenon of falling off occurred; the power line and the signal line were installed with the same threading tube, which caused large signal interference; there were unshielded nearby Large motor equipment has an impact on the stable operation of the motor; the fuse selection of the position locator is too large, causing damage to its internal choke coil. These problems must be observed in time, discovered and dealt with in time, so as to avoid unnecessary losses.

       (2) Mid-operation

       In the middle of the shot blasting machine's operation, the overall performance of the shot blasting machine's electric actuator has also changed from the running-in period to the adaptation period, and the performance is relatively stable at this time. Most of the problems that arise are the quality problems of individual electronic components. Such as position current converter TAM2, intermediate contactor K1, K2, over-torque micro switch, etc.

       (3) Later period of operation

       In the later stage of operation, the aging problems of components and the wear of transmission parts began to become extremely serious. For example, the aging of the motor coils caused the insulation to decrease and unstable operation; the poor lubrication of the motor decreased the stability of operation; the comparative coil of the positioner was aging or The aging of the position current converter reduces the positioning accuracy; the wear of the transmission parts of the reducer causes the electric mechanism of the shot blasting machine to be unable to adjust, and so on. For these problems, you should check regularly to prevent major failures. Of course, among all the failure factors, there are also factors such as artificial stepping, process baffle jamming, and process mis-operation in actual operation.