Diagnostic method for agricultural machinery failure

Announcer: Yicheng Machinery  TIME:2019-04-23

There are two main types of objective fault diagnosis and subjective fault diagnosis. The objective fault diagnosis method is a method for diagnosing faults through special measuring tools, instruments, equipments, etc., and the use is relatively complicated, and is mainly used for fault diagnosis of professional repair factories with some scales. Subjective fault diagnosis method is a method for diagnosing faults by eye, ear, nose, and hand touch. It is simple and easy to use, and is more suitable for use by robots. Therefore, here is a focus on subjective fault diagnosis:

(1) Adopt "eye-seeing" visual test. Use the eyes to directly observe the abnormal phenomena of agricultural machinery, such as oil leakage, water leakage, smoke emitted by the engine, loose parts, obvious breakage, distortion and so on.

(2) Using the "ear listening" acoustic test. According to the characteristics of the sound, the fault location is judged, and the abnormal sound and accompanying sound which should be noticed when the fault occurs are distinguished, and the relationship between the sound and the speed, the temperature, the load and the sounding position is noted, and the accuracy of determining the fault is improved. For example, the engine piston knocking cylinder is related to the speed, load and temperature. When the speed and temperature are low, the sound is clear; when the load is large, the sound is obvious.

(3) Adopt "nose sniffing" odor test: judge the part where the fault may occur according to the characteristics of the odor, and distinguish the abnormal odor and the accompanying flue gas which should be noticed when the fault occurs. Such as the rubber smell of the belt, the burnt smell of the friction plate, etc., there will be obvious abnormal smell smelling.

(4) Use the “hand touch” tactile test: touch the part suspected of being faulty or related to the fault by hand to find out the fault. If the brake drum is touched by hand, it is proved that the wheel brake has a brake block failure.

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