Bidirectional Rotary Block for Door Operator Locking
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Solution Overview
Problem
Conventional engaging rotary blocks in door operators have weak torsional strength, require complex and costly manufacturing, and are not suitable for large rolling doors due to their design and machining requirements.
Innovation Solution
A bidirectional rotary block with axial slots and radial arc faces on an arc surface, which enhances torsional strength, simplifies manufacturing, and reduces diameter, allowing for easier machining and lower costs, while incorporating a spline shaft hole for simplified brake release mechanisms and speed reduction between the chain disk and rotary shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional engaging rotary blocks are used, then the door operator can function, but the torsional strength is weak and manufacturing is complex and costly
Solution Approach 1:
The rotary block employs an arc-shaped engagement surface instead of a conventional flat or straight surface. This curved geometry distributes stress more effectively, enhancing torsional strength while simplifying the manufacturing process by allowing the use of standard arc-milling operations rather than complex multi-axis machining.
2Ease of manufacture
If conventional rotary block design is used, then basic locking function is achieved, but the diameter is large requiring special machining equipment
Solution Approach 1:
The arc-shaped engagement surface allows for a more compact rotary block design with reduced diameter. The curved geometry enables efficient force transmission in a smaller footprint, eliminating the need for special large-capacity machining equipment while maintaining the locking function.
3Ease of operation
If conventional locking mechanism is used, then the chain disk can be locked, but the manual operation of large rolling doors requires excessive force
Solution Approach 1:
The arc-shaped engagement surface creates a mechanical advantage that reduces the force required for manual operation. As the chain disk rotates, the curved surface gradually engages and disengages, providing a smoother operation with reduced peak forces while maintaining reliable braking when needed.
Solution Approach 2:
The locking mechanism transitions from a static engagement to a dynamic one where the arc-shaped surface allows for gradual engagement. This dynamic characteristic reduces shock loads and makes manual operation easier while maintaining braking reliability through controlled engagement.
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
The bidirectional rotary block provides twice the torsional strength of conventional blocks, is easier and cheaper to manufacture, and facilitates the manual operation of large rolling doors with improved braking efficiency, including dual braking effects and labor-saving opening/closing mechanisms.
Implementation Method 1
A plurality of compression springs (366') are positioned on the side wall (364') and urge against the plurality of movable posts (365') to move them away from the side wall (364').
Implementation Method 2
the wedge wheel (36') is driven to rotate the drive shaft (37'), thereby rolling up or dropping down the rolling door
Implementation Method 3
The rotary shaft (11) is rotatably accommodated in the axial hole (211) with anti-friction bearings
Data Source
AI summary
A door operator comprises a rotary shaft, a chain disk for rotating the rotary shaft, and a locking mechanism for locking the rotary shaft. The locking mechanism comprises a bidirectional rotary block, a plurality of push pins and anti-rotation posts. When the chain disk rotates, the push pins urge the bidirectional rotary block to rotate the rotary shaft, and when the rotary shaft rotates, the of anti-rotation posts lock the bidirectional rotary block, and preclude the rotary shaft from rotating.