Air Balancer Rotary Drum Inertial Load Control
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Solution Overview
Problem
Conventional air balancers fail to prevent suspended loads from moving up or down by inertia when raised or lowered, leading to instability and inaccurate positioning.
Innovation Solution
An air balancer with a rotary drum, a conversion system for air pressure to rotational force, a rotation restriction member that can be disengaged by secondary air pressure, and a control module to manage air supply, ensuring the load stops at desired positions by restricting rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking mechanism is added to prevent high-speed wire rope winding, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the braking mechanism with the existing rotary member that converts air pressure to rotational force. The rotation restriction member is integrated into the same rotational path as the drum, merging two functions (driving and braking) into a unified mechanical system. This reduces overall device complexity while maintaining safety.
Solution Approach 2:
The patent introduces a rotation restriction member as an intermediary element between the air pressure system and the drum. This mediator component controls rotational speed by creating friction-based resistance, providing safety without requiring a complex braking system. The intermediary approach allows gradual speed control rather than abrupt stopping.
2Manufacturing precision
If the load stops instantly at the desired position, then positioning precision is improved, but the risk of inertial movement increases
Solution Approach 1:
The patent applies preliminary anti-action by having the rotation restriction member continuously apply gentle frictional resistance during the approach to the stopping position. This pre-counteracts the inertial force that would otherwise cause the load to overshoot the target position, enabling precise stopping without violent deceleration.
Solution Approach 2:
The patent implements dynamic control by adjusting the air pressure to the rotary member during the stopping phase. As the load approaches the desired position, the air pressure is reduced, allowing the rotation restriction member's friction to become the dominant force, smoothly decelerating the load to a precise stop without inertial overshoot.
3Manufacturing precision
If a rotation restriction member is added to control inertial movement, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The rotation restriction member is merged with the existing air pressure-driven rotary mechanism. Both the driving function (air pressure to rotation) and the restriction function (friction-based speed control) are integrated into the same mechanical assembly, sharing common components such as the rotary member and air supply system.
Solution Approach 2:
The patent uses pneumatic control to regulate the rotation restriction member's engagement. By controlling air pressure to the rotary member, the system dynamically adjusts the friction force applied by the rotation restriction member, enabling precise positioning without mechanical complexity. The pneumatic system provides smooth, adjustable control.
4Stability of the object's composition
If air pressure is continuously supplied to maintain positioning, then positioning stability is improved, but energy consumption increases
Solution Approach 1:
The rotation restriction member provides self-service positioning stability through passive friction-based resistance. Once the load is positioned, the friction force naturally maintains the position without requiring continuous active air pressure supply. The system uses the load's own weight and the friction interface to hold position, reducing energy consumption.
Solution Approach 2:
The patent implements periodic air pressure supply rather than continuous supply. Air pressure is applied to the rotary member only during movement phases (raising and lowering the load), and discharged during positioning and holding phases. This periodic action maintains positioning stability through the rotation restriction member's friction while significantly reducing energy consumption.
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
Prevents inertial movement of suspended loads, allowing precise stopping and stable positioning during lifting and lowering operations, enhancing safety and operational efficiency.
Implementation Method 1
a conversion system that converts pressure of first air supplied into said casing into rotational force of said rotary member for winding the rope member on said rotary drum
Implementation Method 2
an elastic member that biases said rotation restriction member to cause it to be in contact with said rotary member
Implementation Method 3
a piston member held by said cylinder member that is caused to slide by pressure of said second air to push said rotation restriction member to cause it to retract
Data Source
AI summary
An air balancer has a rotary drum on which a rope member is to be wound and that is supported rotatably by a stationary shaft in a casing, a conversion system that converts pressure of first air supplied into the casing into rotational force of the rotary drum for winding the rope member on the rotary drum, a rotary member that is rotatably supported by the stationary shaft and linked with the rotary drum to integrally rotate therewith, a rotation restriction member to be in contact with the rotary member to restrict rotation thereof, a disengagement mechanism that causes the rotation restriction member to retract by pressure of second air supplied into the casing to thereby disengage the contact between the rotary member and the rotation restriction member, and a control module having an air circuit that supplies the second air into the casing only when the first air is supplied into the casing or when the first air is discharged from the casing.