**Equipment Repair for Smoothing Equipment Commonly Used in Rolling Mills**
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**Equipment Repair for Smoothing Equipment Commonly Used in Rolling Mills**
Source: Bearing Network | Date: June 12, 2014
Smoothing equipment plays a crucial role in rolling mills, and regular maintenance and repair are essential to ensure its proper function. Below are key steps and considerations for the repair and maintenance of such equipment.
**(1) Equipment Inspection and Preparation**
Before installation, it is important to carefully review the piping drawings, mechanical equipment diagrams, and foundation plans. Ensure that all connections are correct and match the design specifications. Inspect all equipment and components to confirm they are qualified and come with necessary certifications. Any missing or damaged parts should be replaced immediately. For complex systems, a pre-assembly check is recommended to identify and resolve potential issues before final installation.
Degreasing is an essential step in the cleaning process. This can be done using carbon tetrachloride or sodium hydroxide, followed by rinsing with warm water. A solution of 10–15% hydrochloric acid and 1% urotropine can be used for immersion or removal for 20–30 minutes at a temperature of 40–50°C. Afterward, rinse with warm water and neutralize using a 1% ammonia solution for 10–15 minutes at 30–40°C. Finally, dry the components with clean air and apply anti-rust oil before installation.
**(2) Equipment Removal, Pressure Testing, and Commissioning**
After the equipment is installed, perform a final cleaning cycle to ensure everything is in order. The dry oil and thin oil system should run for 8–12 hours, with a pressure range of 5–3 MPa. The cleanliness level should reach NAS 11 or 12 standards.
Once the system is cleaned, conduct a pressure test by gradually increasing the pressure and maintaining it for 10–15 minutes. Monitor for any leaks or issues and address them promptly. After testing, verify the pressure relay, temperature control, liquid level control, and electrical interlocks as per the manufacturer's instructions before putting the system into operation.
**(3) Equipment Maintenance and Operator Training**
On-site operators must be thoroughly familiar with the equipment, including component diagrams, operating principles, and technical manuals. They should have a good understanding of how to use and maintain the equipment properly, ensuring effective troubleshooting and repairs when needed.
**(4) Common Issues and Solutions in Thin Oil and Dry Oil Stations**
- **Thin Oil Pump Bearing Heating (Slider Pump):** This may occur due to a small bearing clearance or insufficient lubrication. Adjust the gap to 0.06–0.08 mm.
- **Sudden Pressure Increase at the Station:** This is often caused by pipeline blockage. Check and clear the pipeline.
- **Thin Oil Pump Overheating:** Improper pump gap, high oil viscosity, or incorrect pressure settings can cause this. Adjust the gap, select the right oil, and regulate the system pressure accordingly.
- **Pressure Valve Push Rod Malfunction at Low Pressure:** A faulty check valve may be the cause. Inspect the spring and ball, and replace if necessary.
- **Dry Oil Station Pressure Gauge Fails to Hold Pressure:** This could be due to a broken safety valve, poor cooperation of the oil supply piston, or excessive plunger clearance. Replace faulty parts and adjust the system.
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This article is sourced from China Bearing Network. Please visit [http://www.bearingnetwork.com](http://www.bearingnetwork.com) for more information.
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