The following are the key precautions for the installation and debugging of the driving drum, which are organized in combination with the operation specifications and safety requirements:
Foundation Inspection
Confirm that the levelness error of the installation bracket is ≤ 2mm/m, and the perpendicularity error between the axis of the drum and the center line of the conveyor belt is ≤ 1°.
The spacing of the anchor bolt holes should match the drum flange to avoid deformation caused by forced assembly.
Coupling Alignment
The radial deviation of the elastic coupling is ≤ 0.15mm, and the deviation of the end face clearance is ≤ 0.5mm (refer to the equipment manual).
Use a laser alignment instrument or a dial indicator for calibration to avoid vibration or bearing damage caused by misalignment.
Drum Positioning
Use special lifting tools to hoist the drum steadily, and it is prohibited to collide with the rubber surface or the bearing part.
After leveling, pre-tighten the anchor bolts first, and finally tighten them after the coupling is aligned (the torque value should be in accordance with the design requirements).
Tensioning and Belt Adjustment
The counterweights on both sides of the tensioning device need to be released synchronously to avoid unilateral stress on the conveyor belt.
The tension of the conveyor belt should meet the design value (usually 1/10 to 1/8 of the breaking force of the conveyor belt). Excessive tension will accelerate wear, and too loose tension will lead to slipping.
Protection and Sealing
Keep a gap of 5-10mm between the protective cover and the drum to prevent friction.
Check the sealing parts of the bearing end cover to avoid dust entering; for oil-cooled drums, ensure that there is no oil leakage in the oil circuit.
No-load Test Run
The idling time is ≥ 30 minutes, and monitor the temperature rise of the bearing (≤ 35°C) and the vibration value (≤ 1.5mm/s).
Observe the deviation of the conveyor belt, and correct it by fine-tuning the position of the drum (the lateral movement is ≤ 2mm) or the tensioning device.
Load Test
Gradually load to the rated load, and check whether the friction force between the drum and the conveyor belt is sufficient (when slipping occurs, increase the roughness of the rubber surface or adjust the wrap angle).
Check whether the coupling bolts and anchor bolts are loose, and tighten them in time.
Explosion-proof Area
Use copper tools or explosion-proof electric tools to avoid the generation of sparks.
Detect the gas concentration in the environment before installation (< 0.5%), and live working is prohibited.
Low-temperature Environment
Preheat the drum to above 5°C before starting to prevent the rubber surface from embrittlement and cracking.
Select cold-resistant rubber (such as nitrile rubber) to avoid slipping caused by hardening at low temperatures.
Power-off and Lockout
Strictly implement the power-off and power-on system. Lock the control switch and hang a warning sign, and the key should be kept by a designated person.
Confirm that all personnel have evacuated the dangerous area before the test run, and it is prohibited to touch the rotating parts with hands or tools.
Lubrication and Inspection
Add lubricating grease to the bearing according to the regulations (the filling amount is 1/3 to 1/2 of the bearing chamber), and fill the oil level of the oil-cooled drum to the oil level line.
Listen to the sound of the bearing during operation, and stop the machine immediately to check if there is abnormal noise.
Reminder: After the installation is completed, fill in the "Equipment Maintenance Record", record the debugging data (such as tension force, temperature rise), and file it for future reference. During regular maintenance, focus on checking the contact state between the drum and the conveyor belt and the change of the bearing clearance.
