The development of **three roller gates** has evolved over time, with various 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 may design their own structure, leading to differences in failure analysis and repair methods.
1. **Manual Three-Roll Gate**:
This type of gate is generally simple in design, which results in a lower failure rate. 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 the gate can rotate freely without friction.
- **B. Braking issues**: If the brake is too tight or fails to lock properly, check the positioning plate and positioning arm. Replace them if necessary to restore normal function.
2. **Belt-Reduction Transmission Type Three-Roll Gate**:
This was an early model developed by some companies but is now considered obsolete. It is no longer in production, so there is limited need for detailed troubleshooting or analysis.
3. **Electromagnetic Valve Type Three-Roll Gate**:
- **A. Main board receives signal, but the gate does not open**: The main board’s second green light is on, but the gate remains unresponsive.
- Check if the solenoid valve wiring is properly connected.
- Test whether the solenoid valve is conducting. If not, replace it.
- Measure the output voltage of the solenoid valve to ensure it is 24V.
- Clean any dust inside the valve and apply the correct amount of lubricant.
- If the valve hook is broken or disconnected, replace or repair it immediately.
- **B. After power-on, the gate cannot be pulled up, and the card slips off**:
- Check if the electromagnet is receiving power and generating suction.
- Inspect the H6 connection port on the mainboard for 24V output. If not, replace the mainboard.
- 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.
- Ensure the small lead on the lead plate is not stuck between the electric suction plate. Follow the above steps to resolve the issue.
- Check if the compression spring is missing or if the lock is severely worn. Address these issues promptly and apply lubricant as needed.
- **C. Gate cannot reset automatically**: This may occur after multiple rotations or card insertions.
- Check for 12V output at the H2 position on the motherboard. If no voltage is present, the motherboard may be faulty.
- Inspect the switch head for blockage by a metal plate. If the motherboard’s red light is on, the reset switch tail is likely functioning properly.
- If the positioning arm cannot reset, check the solenoid valve voltage (should be 24V). Also, examine the reset coil spring for looseness or wear.
Each type of three-roll gate requires specific troubleshooting steps depending on its design and components. Understanding these differences helps in efficiently diagnosing and resolving issues. Regular maintenance and proper handling are essential to ensure smooth operation and extend the lifespan of the equipment.
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