Ensure the stable operation of the hot delivery roller, reduce the frequency of failures, extend the service life of equipment, and improve the production efficiency and product quality of the continuous casting and rolling production line.
Maintenance personnel and responsibilities
Mechanical maintenance personnel:
- Responsible for the appearance inspection of rollers, supporting structures and transmission systems, including inspection of roller surface wear and scratches, the firmness of the supporting structure and the tightness of the connecting bolts of the transmission system.
- Lubricate the roller bearings and transmission system lubrication points regularly, and add or replace grease (oil).
- Assist electrical maintenance personnel in the installation, commissioning and troubleshooting of equipment.
Electrical maintenance personnel:
- Responsible for the daily maintenance of the motor, including cleaning the motor surface, checking whether the motor wiring is firm, measuring the insulation resistance of the motor, etc.
- Monitor the motor’s temperature and current to ensure the motor is operating within normal range.
- Maintain and debug the control system to ensure the normal functions of the hot delivery roller, such as speed control, temperature monitoring and load monitoring.
Maintenance frequency
Daily maintenance:
- Appearance inspection: Check the overall appearance of the hot delivery roller, including the roller surface, transmission system and supporting structure, to see if there is any obvious damage, deformation or oil leakage.
- Temperature check: Use an infrared thermometer to check the temperature of the motor, reducer and roller bearing to ensure that the temperature is within the normal range.
- Sound inspection: Listen to the sound of the hot delivery roller when it is running to determine whether there is any abnormal noise, such as friction sound, impact sound, etc.
Weekly Maintenance
- Cleaning work: clean the dust, oil and debris on the surface of the hot delivery roller, especially the key parts of the roller surface and transmission system.
- Connection bolt inspection: Check whether the connection bolts of the equipment are tight, including the connection bolts of rollers, supporting structures and transmission systems.
- Motor inspection: Check whether the motor has any damage on the outside, whether the wiring is secure, and whether the vents are blocked.
Monthly maintenance:
- Lubrication management: Replenish or replace the grease (oil) at the lubrication points of the roller bearings and transmission system to ensure good lubrication.
- Speed control check: Check the speed sensor and control system of the hot delivery roller to ensure accurate and stable speed control.
- Temperature monitoring check: Check the working status of the temperature sensor to ensure that the temperature monitoring data is accurate and reliable.
Quarterly maintenance:
- Gear and bearing inspection: Open the inspection hole of the reducer, check the wear of the gears and the operating status of the bearings, and replace them if necessary.
- Concentricity check: Use a dial indicator or other tool to check the concentricity of the shafts of the motor, reducer and roller connected to the coupling. If there is any deviation, make adjustments.
Semi-annual maintenance:
- Comprehensive inspection: Conduct comprehensive inspection and maintenance on the hot delivery roller, including mechanical parts, electrical systems and control systems. Check the wear, performance indicators and operating status of the equipment, and formulate corresponding maintenance and replacement plans.
- Spare parts inspection: Check the spare parts inventory to ensure that there are sufficient spare parts reserves for vulnerable parts.
Specific maintenance content
Appearance inspection
- Check the overall appearance of the hot delivery roller every day, including whether the roller surface is worn, scratched, cracked, etc., and whether the transmission system and supporting structure are deformed, damaged or leaking.
- Record any problems found in time and repair or replace them according to the situation.
Temperature Check
- Use an infrared thermometer to check the temperature of the motor, reducer and roller bearing every day to ensure that the temperature is within the normal range.
- For parts with abnormal temperature, check the cause in time, such as overload, poor lubrication, poor ventilation, etc., and take appropriate measures to deal with it.
Sound Check
- Listen to the sound of the hot delivery roller every day to determine whether there is any abnormal noise, such as friction, impact, etc.
- For abnormal noise, stop the machine in time to check, find the source of the noise, and repair or replace it.
Cleaning work
- Clean the dust, oil and debris on the surface of the hot delivery roller every week, especially the roller surface and key parts of the transmission system.
- Use compressed air or special cleaning tools to clean, and be careful to avoid damage to the equipment.
Connecting bolt inspection
- Check the equipment’s connection bolts weekly to see if they are tight, including the rollers, support structures, and transmission system’s connection bolts.
- Use a torque wrench to tighten according to the specified torque value to ensure that the connection is firm and reliable.
Motor inspection
- Check the motor’s appearance for damage, wiring, and vents daily.
- Measure the motor’s insulation resistance regularly to ensure good insulation performance.
- Check the motor’s temperature and current to ensure the motor is operating within normal range.
Lubrication management
- Lubricate the lubrication points of the roller bearings and transmission system according to the specified lubrication cycle and grease (oil) type.
- Regularly check the oil level and oil quality of the lubricating oil, and replace the deteriorated lubricating oil in time.
Speed control check
- Check the speed sensor and control system of the hot delivery roller every month to ensure accurate and stable speed control.
- According to the billet discharge speed of the continuous casting machine and the rolling speed of the rolling mill, adjust the speed of the hot delivery roller in time to ensure that the billet can be delivered to the rolling mill in time and smoothly.
Temperature monitoring check
- Check the working status of the temperature sensor every month to ensure that the temperature monitoring data is accurate and reliable.
- For abnormal temperature, check the cause in time and take appropriate measures to deal with it.
Gear and bearing inspection
- Open the inspection hole of the reducer every quarter to check the wear of the gears and the operating status of the bearings.
- If necessary, replace the gears or bearings to ensure the normal operation of the transmission system.
Concentricity check
- Use a dial indicator or other tool to check the concentricity of the shafts of the motor, reducer, and roller connected to the coupling every quarter.
- If there is any deviation, make adjustments to ensure the stability of power transmission.
Comprehensive inspection
- Perform comprehensive inspection and maintenance of the hot delivery rollers every six months, including mechanical parts, electrical systems and control systems.
- Check the wear, performance indicators and operating status of the equipment, and formulate corresponding maintenance and replacement plans.
Spare parts inspection
- Check spare parts inventory every six months to ensure that there are sufficient spare parts reserves for vulnerable parts.
- Replenish spare parts inventory in a timely manner based on equipment operation and maintenance experience.
Maintenance records and reports
- Maintenance personnel should record in detail the content, time, problems found and handling of each maintenance.
- Maintenance records should be sorted and analyzed every month to form a maintenance report, including the operating status of the equipment, failure conditions, maintenance measures and effects, etc.
- According to the maintenance report, timely adjust the maintenance plan and measures to improve the pertinence and effectiveness of maintenance work.
Safety precautions
- Before performing maintenance work, the machine must be shut down and the power must be cut off to ensure that the equipment is in a safe state.
- Maintenance personnel should wear necessary personal protective equipment, such as safety helmets, safety shoes, gloves, etc.
- When working at heights, safety belts and safety ropes must be used, and the working platform must be firm and reliable.
- When performing electrical maintenance work, it must be performed by professional electrical maintenance personnel and strictly abide by electrical safety operating procedures.
- When performing lubrication work, avoid splashing lubricating oil on the skin and eyes. If splashed accidentally, rinse with clean water immediately.
- When repairing equipment and replacing parts, appropriate tools and equipment should be used, and the operation should be carried out in strict accordance with the operating procedures to ensure safety.
