Door Opener Error-Start Prevention with Adjustable Sensitivity
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Solution Overview
Problem
Conventional door opener error-start prevention devices require disassembly to adjust sensitivity and often suffer from premature triggering or damage due to inadequate pressure settings, leading to inefficient jam resolution and potential latch device damage.
Innovation Solution
The door opener features a housing with an output shaft and sprocket assembly, including V-shaped slots and elastic elements, allowing for adjustable sensitivity without disassembly through a bolt mechanism, and a delay mechanism in the limit switch device for extended detection time, enabling effective obstacle sensing and reverse operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compression spring pressure is increased to prevent premature triggering, then the reliability of obstacle detection is improved, but the risk of damage to the latch device increases
Solution Approach 1:
The patent applies parameter changes by making the compression spring pressure adjustable through an external adjustment mechanism. This allows the pressure parameter to be optimized for different door weights and conditions, preventing both premature triggering (by increasing pressure when needed) and latch device damage (by reducing pressure when appropriate). The adjustment mechanism enables dynamic adaptation of the pressure parameter to match specific operational requirements.
2Object-affected harmful factors
If the compression spring pressure is decreased to prevent latch device damage, then the safety of the latch device is improved, but the obstacle detection sensitivity becomes too high causing premature triggering
Solution Approach 1:
The adjustment mechanism enables precise control of the compression spring pressure parameter, allowing it to be tuned to achieve the optimal balance between latch device safety and obstacle detection sensitivity. By providing a range of adjustable pressure values, the system can be calibrated to match specific door weights and operational conditions, preventing both premature triggering and device damage.
3Manufacturing precision
If the door opener is disassembled to adjust the compression spring pressure, then the sensitivity adjustment precision is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent extracts the adjustment function from the internal gear box structure and provides it through an external adjustment mechanism accessible from outside the door opener housing. This allows users to adjust the compression spring pressure without disassembling the device, maintaining precision adjustment capability while dramatically improving ease of operation. The adjustment mechanism is designed to be user-friendly and accessible during normal maintenance operations.
4Measurement precision
If the obstacle sensing detection time is extended to improve obstacle detection accuracy, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The patent applies dynamics by making the detection time adjustable rather than fixed. The system can dynamically adapt the detection time parameter based on operational conditions, allowing extended detection time when high accuracy is needed (such as during initial obstacle detection) and reduced detection time during normal operation to maintain productivity. This dynamic adjustment resolves the contradiction between measurement precision and time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the door opener to actively return to its original position during jams without disassembly, with adjustable sensitivity matching door weight and extended detection time, improving jam resolution and preventing premature triggering or latch damage.
Implementation Method 1
a pair of elastic elements received in the accommodation portion at both ends of the output shaft, the outer end side of each elastic element being fixed by a bolt, while the inner end side abutting against the sliding pin
Implementation Method 2
Under the condition of error start of door and the jam with latch device, the rotation of the door opener is stopped so that the torque of the sliding pin is limited. The sliding pin slides backward toward the direction of larger opening of the V-shaped slot
Data Source
AI summary
A door opener error-start prevention device, the output shaft of the door opener is formed as a hollow accommodation portion, a pair of axial sliding slots are formed on the periphery, and a sliding pin radially inserted; a pair of elastic elements, abutting against the sliding pin from both ends, the outer end of each elastic element fixed by a bolt; a sprocket assembly is rotationally invaginated on the output shaft, one end having a sprocket , the other end formed with a pair of V-shaped slots corresponding to the sliding slots on the output shaft, both ends of the pin engage in the V-shaped slot to drive the sprocket. When an error start of the door occurs, the door returns to the original position by actuation of an obstacle sensing device actuated by the sliding pin, the sensitivity of which is adjusted by a bolt at the outside of the output shaft.