During the daily lifting work of marine cranes, in order to prevent overloading operations, special protection devices will be installed, that is, crane torque limiters. When the torque reaches more than 90% of the rated lifting moment under the corresponding working conditions, it will sound and light an alarm, reaching more than 110%, it will output an overload control signal, cooperate with the crane control circuit, stop the rising action, but can perform the falling action, which can effectively avoid accidents caused by overloading in the daily work of the crane. In order to use it effectively, Our maintenance personnel also need to master its daily maintenance and troubleshooting!
We Need To Understand The Principle Of Use Of Marine Crane Torque Limiter
Before starting to operate the marine crane, we need to ensure that the power of the torque limiter is turned on, check the relevant data display according to the instructions, and confirm that the working state of the torque limiter is normal before operating! The various display parameters of the torque limiter must be set in accordance with the actual working state of the crane (rated weight, magnification, main hook and auxiliary hook, etc.) in order to play a role in safety protection. When operating a crane, it is necessary to observe the various data displays of the torque limiter to ensure that the work is performed within the performance range of the crane. When overload occurs, the torque limiter will send out sound and light alarm and output control signal, and the marine crane will stop part of the action. At this time, it is necessary to lower the hook to reduce the lifting weight until the alarm stops, and then start working.
Routine Inspection And Maintenance Of Torque Limiter
a. When connecting power cords, pilot control lines or signal lines, attention should be paid to wiring marks to prevent damages to equipment.
b. When dismounting the machine under certain situations, note down the connections of different lines so as to prevent damages to the mainframe in case of wrong connection.
c. Protect the equipment when dismantling for transport.
d. Switch off the power before leaving for home everyday. Prevent the instrument from exposure to rain.
e. Non-maintenance personnel should not be allowed to change any part of the configuration of the equipment. In case of malfunction, the trained professionals should handle the problems according to the methods and procedures specified in the Manual. If the problem is too tricky to solve, contact the Marine Crane manufacturer.
f. Check the accuracy of the system regularly with an interval of 3-6 months to ensure the safe operation of the crane. Reports are needed for file.
Analysis and Treatment of Common Faults of Torque Limiter of Marine crane
a. Display Instrument not operating, monitor not working.
Reasons: Power cord is pulled out or no electric power input; malfunction of stabilized power source; safety fuse blew out.
Solutions: check the power lines and output voltage, connect the power supply.
b. Weight Value doesn`t change.
Reason:Weight Sensor cable failure; Weight Sensor damaged or Zero and Full Scale Calibration are incorrect.
Solutions: find the break point of the cable, reconnect it according to its color and take water-proof measures; or replace the sensor and recalibrate the Weight Zero and Weight Full Scale.
c. Upon receiving the signal, the displayed values change accordingly but in big discrepancy with the actual values and beyond the range of permissible error.
Reasons: incorrect calibration of zero and full scale.
Solutions: recalibrate the weight zero and weight full scale.
The consequences of overloading the marine crane are very serious. The crane will be fatigued for a long time and its life will be greatly shortened. If an accident occurs, it will cause unimaginable damage to the ship and personnel. The torque limiter can help the marine crane to work safely. We also need Master the knowledge in this area, standardize the operation of the crane, and keep safety first in mind!
