Hand-pulling Drive Mechanism for Industrial Doors
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Solution Overview
Problem
Current hand-pulling drive mechanisms for industrial doors have complex component connections, leading to inefficient force distribution, increased operational effort, limited usability, and safety concerns during assembly, disassembly, and maintenance.
Innovation Solution
A hand-pulling drive mechanism featuring a gear pair with engagement and disengagement states, an eccentric pulling device with a torsion jacket and elastic element, and a rotation propelling device with a feeding tube and torsion spring, which allows for direct force transmission and automatic return mechanisms, along with a safety feature using a hit ring and protection switch to control motor power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional hand-pulling drive mechanism with indirect component connections is used, then the structure is simple, but the force distribution is inefficient and operational effort is increased
Solution Approach 1:
The drive mechanism is segmented into distinct functional modules: hand-pulling device, drive shaft, drive gear, follower gear, and disengagement mechanism. This segmentation allows direct force transmission from the hand-pulling device to the drive shaft through the drive gear, eliminating indirect connections and reducing force loss while maintaining structural simplicity
Solution Approach 2:
The drive gear acts as an intermediary element that directly transmits force from the drive shaft to the follower gear. This direct intermediary connection eliminates the need for multiple intermediate components, improving force distribution efficiency while keeping the overall structure simple and easy to manufacture
2Volume of moving object
If conventional hand-pulling drive mechanism is used, then the structure is compact, but the pulling angle and position are limited
Solution Approach 1:
The mechanism incorporates a dynamic disengagement mechanism that allows the drive gear to engage and disengage from the follower gear based on the pulling position. This dynamic adaptability enables the compact mechanism to accommodate various pulling angles and positions without increasing its volume, as the engagement state changes dynamically with user operation
3Stability of the object's composition
If conventional hand-pulling drive mechanism is used, then the assembly is integrated, but the assembly, disassembly and maintenance are inconvenient
Solution Approach 1:
The mechanism is divided into separable modules including the hand-pulling device, drive shaft assembly, gear pair, and disengagement mechanism. These segmented modules can be easily assembled and disassembled while maintaining stable integrated operation during use, greatly facilitating maintenance and repair operations
4Ease of manufacture
If conventional hand-pulling drive mechanism is used, then the structure is simple, but the safety is unreliable
Solution Approach 1:
The disengagement mechanism serves as a safety intermediary that automatically disconnects the drive gear from the follower gear under abnormal conditions. This simple yet effective intermediary mechanism provides reliable safety protection without complicating the overall structure, maintaining ease of manufacture while significantly improving operational safety
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 mechanism reduces operational effort by concentrating force, enhances safety by automatically shutting off motor power during manual operation, and facilitates easy assembly and maintenance by allowing chain pulling in any position and separating components for maintenance.
Implementation Method 1
a torsion spring connected with the feeding tube for driving the shaft to return to an original position when the feeding tube is rotated
Implementation Method 2
an elastic element disposed on one end which is distanced far away from the hand drive device, of the shaft, and the elastic element is pressed against the torsion jacket at the other end which is close to the hand drive device. The elastic element provides a return force for the torsion jacket when the shaft is rotated
Data Source
AI summary
A hand pulling drive mechanism includes a hand drive device and a shaft connected with the hand drive device. The mechanism further includes a gear pair, a rotation propelling device connected with the shaft, and an eccentric pulling device including a shaft pin placed on the shaft and a torsion jacket pivotally connected to the shaft and rotated relative to the shaft pin. The gear pair includes a drive gear sleeved on the shaft for switching, and a follower gear secured to a motor shaft. The rotation propelling device is connected with the drive gear. The torsion jacket and the drive gear pull the torsion jacket through eccentric rotation of the shaft pin when the shaft is rotated, so that the drive gear moves in an axial direction and the follower drive engages with and disengages from the drive gear.