Daily Maintenance and Inspection Methods for Lifting Machinery (Part 2)

1.3 Inspection of the Overhead Crane Traveling Mechanism

General steps for inspecting the trolley travel mechanism:

1. Fixed Inspection of the Trolley Travel Mechanism: Verify that the mechanism is securely and reliably anchored, check whether bolts are tightened, and inspect them for any damage.

2. Inspection of the gearbox: Check for oil leaks and determine whether refueling is necessary. Also, verify that the gearbox is operating quietly without any unusual noises.

3. Motor Inspection: Check whether the wiring is loose and verify if the junction box is secure. 4. Brake Inspection: Ensure the brake can open smoothly, measure the brake clearance to confirm it’s within the allowable range, inspect the friction pads for wear and thickness—replace them immediately if necessary—and check that the brake’s mounting bolts and adjusting nuts are properly tightened.

1.4 Inspection of the Control Panel

First, inspect the control box by checking the cable entry point: Ensure the seal is intact and that cable connectors are securely fastened. Next, verify whether the remote receiver is functioning properly, confirm all indicator lights are working as expected, and make sure the signal output plug is firmly and reliably connected. Then, examine the terminal block for signs of aging or loose wiring, and check that all switches are in good condition, while also ensuring there’s no looseness in the connections of contactors and relays.

1.5 Inspection of the Cart

First, inspect the trolley's mechanism: check whether all components are securely connected and ensure there are no loose connections or cracks in the welds. Next, verify that the buffer is properly and firmly fixed, and confirm it hasn’t shown signs of aging. Then, examine whether the trolley’s running mechanism is securely anchored—specifically, make sure the mounting bolts or nuts are tightly fastened. Finally, inspect the gearbox and brake system; these checks are almost identical to those performed on the main bridge crane.

1.6 Inspection of the Lifting Unit

The lifting mechanism of a crane is the top priority in crane maintenance, as it directly affects how often a crane experiences major accidents.

General steps for inspecting the lifting mechanism:

1. Inspect the drum surface for wear, check the lubrication condition, verify whether the wire rope has jumped out of its groove, and look for any signs of rust on the drum.

II. Inspect the steel wire rope for defects, damage, strand breaks, wire breaks, loose strands, and other abnormalities; also check whether the rope-pressing blocks are loose.

3. Check whether the hook has any external damage, if the bolts are loose, if the safety latch is intact, and if the hook head rotates smoothly.

4. Check the securement of the hoist limit switch, ensuring that the lock nuts are properly tightened. Also, verify the functionality of the limit switch and confirm that all wiring connections are tight and free from looseness.

5. Check whether the lifting motor is securely fastened, ensure that the wiring inside the junction box is tight and secure, and listen for any unusual noises during motor operation.