Over the past 20 years, our team has specialized in the maintenance, rapid repairs, and comprehensive overhauls of horizontal screw centrifuges. We cater to both imported brands like Flewis, Alfa Laval, Anderitz, Beares, Vesfaria, and Ishikawashima, as well as domestically produced models such as Ruiwei, Haishen, Shangli, Qingtian, and Lushui. Our expertise helps address the common maintenance challenges faced by many users of horizontal spiral centrifuges. Here’s an organized summary of typical issues and their solutions:
### 1. Oil Pressure Failures
Oil pressure anomalies are a frequent issue, often presenting as insufficient, excessively low, or overly high oil pressure. Here's how to handle these cases:
- **No Oil Pressure**: Inspect the oil filter for blockages, verify the condition of the pressure gauge, and ensure all oil lines and joints are securely connected without leaks or cracks. Ensure the oil lines remain unobstructed.
- **Low Oil Pressure**: Typically, the standard outlet pressure for centrifuges used in coal preparation plants should range between 3.0–3.5 bar. If the pressure is too low, confirm that the oil passage from the pump through the filter to the tank is clear. Investigate potential oil circuit leaks, and check if the coupling between the motor and oil pump is damaged—replace it if necessary. Also, inspect the oil pump for damage and replace it accordingly.
- **High Oil Pressure**: If the oil pressure exceeds safe levels, verify that the correct grade of mechanical oil is being used per the equipment manual. Check all pipelines for obstructions; if blocked, use compressed air to remove debris.
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### 2. Excessive Vibration During Operation
Excessive vibration usually stems from improper installation, a clogged or deformed screen basket, blocked coal channels, or loose bolts. Solutions include:
- Inspect the screen basket for blockages, wear, or deformation.
- Check if the exciter springs are worn out.
- Look for fine coal accumulation on one side of the screen basket.
- Assess the condition of the wedge-shaped screen basket for damage, deformation, or imbalance.
- Confirm that the ground anchor bolts are secure and free from rust.
- Inspect the bearings for damage—if they are faulty, replace them.
- When replacing a new vibrating motor, ensure it matches the specifications of the other motor and is balanced.
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### 3. Abnormal Noise Issues
Abnormal noises typically arise due to narrow gaps between the screen basket and scraper, foreign objects inside the machine, or damaged bearings. Address these issues by:
- Checking the alignment and clearance between the screen basket and scraper.
- Verifying the oil circuit is functioning properly.
- Inspecting for foreign objects inside the equipment.
- Examining the condition of the belts for damage or detachment.
- Evaluating the integrity of the bearings.
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### 4. Motor Malfunctions
Motor failures can manifest in various ways, including failure to start/stop or experiencing overcurrent/overheating issues.
- **Start/Stop Failure**: Verify the power supply voltage and correct operation of the starter. Check for grounding errors, phase breaks, or short circuits in adjacent wiring. Ensure the motor isn't overloaded mechanically.
- **Overcurrent/Overheating**: Tighten all motor mounting bolts and inspect the end cap for damage. Address any sticky or excessively greased bearings. Reduce the feed rate if it’s too high, and clear any accumulated discharge material at the base.
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### 5. Feeding and Discharge Problems
Feeding and discharge malfunctions often result from worn-out screens, excessive coal volume, or high moisture content in coal-water mixtures. To resolve these issues:
- Check for abrasive leaks in the screen basket; replace it if necessary.
- If the feed processing volume decreases or materials become blocked, evaluate changes in coal quality or excess coal sludge, and improve feeding control.
- Control moisture levels in the feed mixture and inspect for screen blockages. Verify the gap between the scraper and screen basket or assess the scraper’s condition. Additionally, check for wear on the chute.
These are some of the most common centrifuge maintenance issues and their solutions. By addressing these systematically, we aim to minimize downtime and enhance operational efficiency for users of horizontal screw centrifuges.
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