Chain Hoist Brake Control for Synchronized Load Stability
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Solution Overview
Problem
Existing control systems for parallel operation of chain hoists fail to ensure safe and synchronized operation, leading to potential load skewing and instability, particularly when handling heavy or long loads.
Innovation Solution
A control device where each chain hoist is equipped with an electric drive motor, a slip clutch, and a brake, with controllers and electromagnets interconnected to engage brakes in a cascade manner if one hoist's brake is activated, ensuring synchronized stopping of all hoists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If chain hoists are operated in parallel for lifting heavy loads, then lifting capacity is improved, but load stability deteriorates due to potential skewing
Solution Approach 1:
The patent implements a feedback mechanism where sensors detect the position and status of each chain hoist, and this information is fed back to the control device. The control device continuously monitors hoist positions and automatically adjusts operation to maintain load horizontality, preventing skewing while enabling parallel operation for heavy loads.
Solution Approach 2:
The patent combines multiple chain hoists under a single control device that manages them as an integrated system. The control device coordinates the operation of all hoists together, ensuring they work in unison to maintain load stability while collectively handling heavy loads that would exceed the capacity of individual hoists.
2Device complexity
If individual brake control is used for each chain hoist, then device complexity is reduced, but safety deteriorates due to unsynchronized braking
Solution Approach 1:
The patent merges the brake control systems of multiple chain hoists into a single integrated control structure. The control device manages all brakes collectively, ensuring they engage and disengage in synchronization. This unified approach maintains operational safety through coordinated braking while avoiding the complexity of entirely separate brake control systems.
Solution Approach 2:
The feedback mechanism monitors the status of individual brakes and hoists, providing real-time information to the control device. This enables the control device to maintain synchronized braking across all hoists by automatically adjusting brake engagement based on feedback from sensors and hoist status, ensuring safety without requiring complex independent control for each brake.
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
This solution ensures safe and synchronized operation of multiple chain hoists by engaging all brakes if one hoist's brake is activated, preventing load instability and ensuring safe handling of heavy or long loads.
Implementation Method 1
the brake of a chain hoist is controlled via a first electromagnet, which is connected to the respective brake and the respective controller
Data Source
Figure 1
Figure 2
AI summary
The arrangement has chain hoists (1a, 1b, 1c), which include a drive motor (2), which acts over a friction clutch (8) on a gear, and brakes (13), which act behind the friction clutch on the gear. Controls (3a, 3b, 3c) are attached to each drive motor and each brake. The brakes are electrically connected with one another in such a manner that one brake, which is brought into engagement, of the chain hoist effects that the brake of the other chain hoist is brought into engagement.