anti-smashing technologies for parking lot gates

Barrier Gate Anti-crash Technologies

1. Obstacle Detection Anti-crash
   Overview: Also known as pressure-based anti-crash, this system features an obstacle rebound mechanism. When the barrier gate descends and encounters a person or vehicle, the rubber anti-crash strip at the bottom of the gate detects resistance. The gate automatically transitions from descending to ascending, preventing further contact. The contact resistance can be adjusted according to needs.
   Principle: The obstacle rebound mechanism consists of three parts: a pressure switch, a pressure tube, and an anti-crash rubber strip. The pressure tube connects the pressure switch to the rubber strip. When the gate descends and the rubber strip encounters an obstacle, the pressure causes the strip to deform, sending a signal through the pressure tube to the pressure switch. The switch relays this signal to the barrier gate’s control system, triggering the gate to rise. Once the obstacle is removed, the rubber strip returns to its normal shape, and the gate descends again.
   Advantages: Low cost and widely used.
   Disadvantages: Sensitivity issues may delay the gate’s rise, requiring adjustments to the contact resistance.
   
2. Infrared Anti-crash
   Overview: Infrared devices are installed at the entrance and exit of parking lots. When the barrier gate is lowering and detects a person or vehicle through the infrared system, the gate quickly ascends to prevent accidents.
   Principle: Infrared sensors are placed on both sides of the barrier gate. If an obstacle interrupts the infrared beam during descent, the system sends a signal to raise the gate.
   Advantages: Accurate detection, unaffected by gate sensitivity.
   Disadvantages: Vibration can cause misalignment of the infrared beams, and the limited range makes it unsuitable for large entrances. The system can also be disrupted by rain or snow.
   
3. Loop Coil Anti-crash
   Overview: A loop coil is buried underground at the entrance and exit of the parking lot. It detects vehicles passing through and prevents the gate from lowering onto a vehicle.
   Principle: A release loop is buried before the vehicle’s entry to detect its approach and send a signal to the system to raise the gate. A second anti-crash loop is installed at the barrier gate position to detect vehicles underneath the gate, preventing it from lowering until the vehicle has passed.
   Advantages: Mature technology, widely applied.
   Disadvantages: Prone to interference from strong electromagnetic fields.
   
4. Digital Anti-crash
   Overview: Digital anti-crash technology integrates detection and anti-crash systems without needing auxiliary devices. It monitors the gate and vehicle in real-time, quickly raising the gate upon detecting an obstacle. This makes it a safer and more reliable solution.
   Principle: The system continuously monitors the current of the gate's motor. If the current exceeds a set value when a person or vehicle is present, the motor stops and reverses direction, causing the gate to rise.
   Advantages: Advanced technology, unaffected by external environmental factors.
   Disadvantages: Higher component cost and limited application scope.
   
5. Radar Anti-crash
   Overview: Radar-based anti-crash is an advanced evolution of loop coil detection. It offers more precise detection of vehicles, pedestrians, and bicycles, with stronger environmental adaptability and lower error rates.
   Principle: Two radar sensors are used—one for release and one for anti-crash. The release radar is installed on the license plate recognition machine, while the anti-crash radar is installed on the barrier gate. The release radar detects vehicles and controls the gate’s movement.
   Advantages: The most advanced anti-crash technology available for parking barriers.
   Disadvantages: Radar technology is still developing and is not yet widely adopted.