The development of **three roller gates** has evolved over time, with different types being introduced based on technological advancements and user needs. These include manual three-roll gates, belt-reduction transmission type three-roll gates, electromagnetic valve type three-roll gates, and automatic three-roll gates. Each manufacturer designs their own structure, which leads to variations in failure analysis and repair methods.
1. **Manual Three-Roll Gate**:
This type is the simplest in design, making it less prone to failures. Common issues include:
- **A. Loose A-lead disk**: Clean the chassis and use the appropriate wrench to tighten the movement and lead plate. Adjust the position so that it rotates freely without any obstruction.
- **B. Brake not locking properly**: This can be caused by a faulty positioning plate or arm. Replace these components promptly to restore proper function.
2. **Belt-Reduction Transmission Type Three-Roll Gate**:
This was an early model developed by some companies but has since been phased out due to inefficiency and limited usage. As such, there is little need for detailed analysis or troubleshooting for this type.
3. **Electromagnetic Valve Type Three-Roll Gate**:
This type uses solenoid valves to control the gate’s operation, and several common issues may arise:
- **A. Main board receives signal, but brake does not open**:
1. Check if the solenoid valve wiring is properly connected.
2. Test whether the solenoid valve is conducting. If not, replace it.
3. Measure the output voltage of the solenoid; it should be 24V.
4. Clean the valve and apply the correct amount of lubricant.
5. If the valve hook is broken or loose, replace or fix it immediately.
- **B. After power-on, the rod cannot be locked, and the card slips off**:
1. Confirm that the electromagnet is receiving power and generating suction.
2. Check the H6 port on the mainboard to ensure it outputs 24V. If not, replace the mainboard.
3. Loosen the M5 screws on both sides of the electric chuck assembly, close the valve stem, and adjust the small lock head and electric suction plate on the lead plate to maintain a 0.5–1mm clearance.
4. Ensure the small lead on the lead plate is not stuck between the electric suction plate. Use the same method as above if necessary.
5. Check if the compression spring is missing or the lock mechanism is severely worn. Repair or replace as needed and apply lubricant.
- **C. Gate cannot reset automatically**:
1. Check for 12V output at the H2 port on the motherboard. If no voltage is present, the motherboard might be faulty.
2. Inspect the switch head for blockage by a metal plate. If the motherboard light is red, check the reset switch tail. A red light indicates normal operation. Identify which component is malfunctioning.
3. If the positioning arm fails to reset after the gate opens, check the solenoid valve voltage (should be 24V). Also, inspect the reset coil spring for looseness or wear.
Each type of three-roll gate requires specific troubleshooting steps, and understanding the differences in design and operation is key to effective maintenance and repair. Regular inspection and timely replacement of worn parts can significantly extend the lifespan of these systems.
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