In cement tank trucks, wire coils (also known as steel wire ropes or tank-securing wire ropes) are primarily used to secure the tank, prevent uncontrolled rotation, and serve as a safety backup in emergency situations (such as when the hydraulic system fails) to prevent the tank from continuing to rotate due to inertia and causing danger. The following is a detailed introduction to wire coils in cement tank trucks:
Functions of Wire Coils
1. Safety Limiter: Prevents uncontrolled rotation of the tank due to hydraulic system failure during unloading or transportation.
2. Auxiliary Fixation: Reduces tank sway and enhances stability while the vehicle is in motion.
3. Emergency Brake: If the hydraulic motor or reducer fails, the wire coils can be manually tightened to forcibly stop the tank's rotation.
Structure of Wire Coils
- Wire Rope: Typically, high-carbon galvanized steel wire rope (such as 6×19 or 6×37) is used, with a diameter of 8mm to 16mm, offering high strength and corrosion resistance.
- Adjustment Device:
- Tensioner (turnbuckle/turnbuckle): Used to adjust the tension of the wire rope.
- Securing Clip (U-clip or wire rope clamp): Ensures the wire rope is securely connected.
- Anchor Point:
- Tank Flange: One end of the wire rope is secured to the tank flange or welded lug.
- Frame or Girder: The other end is secured to an anchor point on the frame.
Coil Wire Installation Methods
1. Cross-Fixing Method(Common Method):
- Two wire ropes are crossed in an "X" shape, connecting the tank and frame, respectively, to provide more stable positioning.
2. Parallel-Fixing Method:
- Two wire ropes are arranged in parallel, suitable for smaller tanks or designs with a low center of gravity.
Maintenance and Inspection
- Regular Inspection:
- Inspect the wire rope for broken wires, rust, or deformation(replace if more than 10% of the wires are broken).
- Check the tensioner for looseness to ensure the wire rope maintains proper tension.
- Lubrication and Maintenance:
- Apply wire rope-specific grease to prevent rust and wear.
- Replacement Standard:
- If the wire rope shows severe wear, deformation, or corrosion, it must be replaced immediately.
Common Faults and Solutions
| Fault Symptom | Possible Cause | Solution |
|------------|-------------|-------------|
| Loose Wire Rope | Tensioner Failure or Loose Fixing Clip | Re-adjust the tensioner and replace the damaged clip |
| Broken Wire Rope | Chronic Wear, Overload, or Corrosion | Replace the wire rope and check for deformation at the fixing point |
| Excessive Tank Vibration | Coil Not Tightened or Loose Fixing Point | Re-tighten and Check the Fixing Bolts |
Safety Precautions
- Do Not Remove the Coil: Even if the hydraulic system is functioning properly, the coil remains an important safety backup.
- Do Not Overload: Excessive tank inertia may cause the wire rope to break.
- Regular Maintenance: Check the condition of the wire rope at least every three months.
Summary
The wire coil on a cement tanker is a critical component for transport safety, primarily preventing the tank from spinning out of control. Regular inspection and lubrication are required to ensure reliability. If severe wear or rust is observed, it should be replaced promptly to avoid accidents.
