Whether it is a new car or an old car in long-term use, it is difficult to avoid the occurrence of a fault. In the cold chain transportation, in order to ensure the preservation degree of frozen and refrigerated foods, the refrigerating transportation efficiency must meet certain standards, and the performance of the refrigerated truck must meet the corresponding requirements. In addition, once the refrigerated truck fails, it is necessary to make a judgment in time.
According to the years of experience of refrigerated truck manufacturers, the failure of general refrigerated trucks is related to the change in mileage. In terms of professionalism, the probability that a car that uses a certain driving range will malfunction within the driving range of the unit is also called the failure rate. It is an important parameter to measure the reliability of a refrigerated truck and reflects the extent to which the refrigerated truck loses its ability to work. Under normal conditions of use and maintenance, the relationship between the failure rate of the refrigerated truck and the mileage is a "bathtub" shape curve.
1, the early stage of the failure
The early failure period is equivalent to the running-in period of the refrigerated truck. Due to the large amount of initial wear, the failure rate is high, but it gradually decreases as the mileage increases.
2, the failure occurs in a random period
In the random failure period, the occurrence of refrigerated truck faults is random. No specific faults play a leading role, mostly due to improper use, negligent operation, poor lubrication, poor maintenance, and internal hidden dangers or process and structural defects. Caused by accidental factors. During this period, the refrigerated truck or assembly is in an optimal state, and its failure rate is low and stable, and its corresponding mileage is generally referred to as the effective life of the refrigerated truck.
3, fault wear period
In the period of wear and tear, due to the sharp increase in the wear of parts, most of the parts are seriously worn out. In particular, most parts that are subject to alternating load and are easily worn out have deteriorated, so the failure rate rises sharply and a large number of faults occur. Repairs will result in the retirement of the refrigerated truck or assembly. Therefore, we must grasp the point of loss and develop a reasonable maintenance cycle.
According to the failure rate of the refrigerated truck in the corresponding period, the user should pay attention to the appropriate adjustment of the driving plan, or do some basic protection measures. In short, try to avoid failures.
