Tripod gates, as a type of security door system combining passageway control and tripod structure characteristics, require a design that balances mechanical stability and intelligent sensing capabilities for their anti-pinch function. Their technical principles can be analyzed from the perspectives of mechanical structure optimization, sensor technology fusion, power control system coordination, adaptive anti-pinch algorithms, redundant safety mechanisms, material and process innovation, and scenario-specific adaptation.
Mechanical structure optimization is the foundation of the anti-pinch function. The core structure of a tripod gate typically consists of a retractable tripod support frame and the gate body. Its anti-pinch design needs to reduce the risk of pinching through mechanical structural innovation. For example, rounded corners are used at the edges of the gate body or the joints of the tripod to avoid direct injury to people or objects from sharp edges. Simultaneously, optimizing the tripod's telescopic mechanism ensures smooth movement of the gate body during opening and closing, reducing pinching accidents caused by mechanical vibration or jamming. Furthermore, some designs incorporate elastic buffer devices at the connection between the gate body and the tripod. When the gate encounters resistance, the buffer device absorbs some of the impact force, reducing the pinching force and buying time for subsequent anti-pinch response.
The integration of sensor technologies forms the core sensing layer of the anti-pinch function. Tripod gates typically integrate multiple types of sensors to achieve accurate obstacle detection. Infrared sensors are a common choice, emitting and receiving infrared light to monitor obstacles in the gate's movement path in real time. When the infrared light is blocked, the sensor immediately sends a signal to the control system, triggering the gate to stop or reverse its movement. Capacitive sensors are also widely used in anti-pinch designs, detecting changes in capacitance between the gate edge and an obstacle to determine the presence of a pinch risk. Compared to infrared sensors, capacitive sensors are more sensitive to detecting metal or conductive objects and are unaffected by environmental factors such as light and dust, improving the reliability of the anti-pinch function.
The coordinated operation of the power control system is crucial for the execution of the anti-pinch function. When the sensor detects an obstacle, the power control system must respond quickly and adjust the gate's movement. This process typically involves the coordinated operation of the motor control, braking system, and transmission mechanism. For example, upon detecting a pinch risk, the control system immediately cuts off the motor power and activates the braking system, causing the gate to stop moving within a short time. Some high-end designs also employ force feedback control technology. By monitoring changes in motor current or torque, they assess the resistance experienced by the gate in real time. When the resistance exceeds a preset threshold, they automatically trigger reverse movement to prevent pinching accidents.
The adaptive capability of the anti-pinch algorithm is crucial for improving functional robustness. Due to the diverse usage scenarios of tripod gates, their anti-pinch algorithms must possess adaptive capabilities to cope with challenges in different environments. For example, the algorithm needs to dynamically adjust detection sensitivity and response thresholds based on the gate's movement speed and the material and shape of obstacles. In high-speed movement scenarios, the algorithm increases the detection frequency and shortens the response time; while in low-speed or static scenarios, it reduces false triggers by decreasing sensitivity. Furthermore, the algorithm must have learning capabilities, optimizing the anti-pinch strategy by recording historical data, such as lowering the detection threshold in areas with frequent false triggers or adjusting the gate's movement mode within specific time periods.
Redundant safety mechanisms are the last line of defense for the anti-pinch function. To ensure the absolute reliability of the anti-pinch function, tripod gates typically employ multiple redundancy mechanisms. For example, when the main sensor fails, the backup sensor immediately takes over the detection task; when the control system malfunctions, the mechanical limit device forces the door to stop moving, preventing clamping accidents. Furthermore, some designs integrate emergency stop buttons or manual release devices, allowing operators to directly intervene in door movement in emergencies, further enhancing safety.
Innovation in materials and processes provides physical protection for the anti-pinch function. The choice of materials for the door and tripod directly affects the anti-pinch effect. For example, using high-strength, lightweight aluminum alloy or carbon fiber materials can reduce door inertia while ensuring structural strength, thus reducing clamping force; while the soft rubber or silicone material covering the surface can further buffer impact forces, avoiding direct injury to people or objects. In addition, precise manufacturing processes ensure the assembly accuracy of the door and tripod, reducing the risk of clamping caused by mechanical clearances.
Scenario-specific adaptation is key to the successful implementation of the anti-pinch function. Different usage scenarios have different requirements for the anti-pinch function. For example, in high-traffic scenarios such as airports and train stations, the anti-pinch function needs to balance rapid passage and safety protection. By optimizing the sensor layout and power response speed, the door can be opened quickly and closed safely. In industrial plants or warehouses, the anti-pinch function needs to focus on the passage of large goods or equipment. By adjusting the door size and detection range, it can ensure full coverage of obstacles.
