Application of Port Lifting: Fault Analysis of Container Shore Crane Gearbox

Shore crane, also known as shore container crane, is one of the core equipment in container ports, and its lifting gearbox is the main transmission device of the shore crane lifting system. Case: Regular oil monitoring work was carried out on more than 40 shore cranes at a container terminal in Shenzhen.

(1) Problem raised: The 25 # shore crane gearbox at a container terminal in Shenzhen conducts regular oil monitoring once a quarter. During the oil monitoring in March 2008, abnormal monitoring results were found.

(2) Oil monitoring analysis: The shore crane lifting gearbox uses SHELL Omala 320 gear oil, and the monitoring items include physical and chemical analysis (40 ℃ kinematic viscosity, moisture, total acid value), spectral element analysis, and ferrographic wear analysis.

(A) Physical and chemical analysis: The viscosity and moisture of the lubricating oil in the gearbox did not show significant fluctuations during the six-month period, indicating that the working environment and sealing condition of the gearbox are good.

The total acid value of lubricating oil: According to the test results, except for a significant decrease in total acid value due to oil change in September 2008, the overall change is within the normal range, indicating the normal consumption of acidic additives in gear oil.

(B) Wear trend analysis: The following figure shows the variation of the quantitative wear trend (direct reading iron spectrum) of the gearbox for 6 times. It can be seen from the figure that the test results show a continuous increasing trend, exceeding the normal average level by hundreds of times in April 2008, indicating that the wear of relevant components of the gearbox has accelerated and deteriorated.

(C) Iron spectrum wear analysis: The following figure shows the iron spectrum image of abnormally worn metal particles in the gearbox in March 2008. It can be seen from the figure that there are a large number of steel fatigue peeling and worn metal particles in the oil, and some particles have obvious high-temperature oxidation marks on the surface, indicating that the gearbox has undergone severe abnormal wear.

(3) Measures taken and feedback information: To avoid major accidents, it is recommended that the port immediately shut down and inspect the shore crane gearbox. The following picture shows the disassembled gearbox. From the photo, it can be seen that there is obvious pitting corrosion on the tooth root to the pitch line of the main gear of the shore crane gearbox, and serious fatigue peeling has also occurred between the rolling elements and outer rings of the second and third stage bearings. At the same time, shorten the monitoring cycle for other devices with similar situations and implement focused monitoring. After maintenance, the gearbox has been put into normal production and is in good operating condition.