Permanent Magnetic Lifter with Trial Clamping Position
Solution Overview
Problem
Permanent magnetic lifting devices lack the ability to determine the maximum clamping force under specific conditions, leading to potential safety risks during lifting operations, as operators cannot ascertain whether the ratio of maximum clamping force to workpiece weight meets safety criteria.
Innovation Solution
A permanent magnetic lifting device with a housing, fixed magnet, and turnable magnet, featuring a positioning mechanism that allows the turnable magnet to be positioned in three distinct configurations: zero, trial, and maximum magnetic force settings, enabling operators to assess the clamping force ratio through trial clamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent magnetic lifting device operates at maximum clamping force under ideal conditions to achieve a 3-time safe lifting coefficient, then the lifting capacity is maximized, but the safety risk increases because operators cannot ascertain the actual maximum clamping force under specific working conditions
Solution Approach 1:
The patent applies preliminary action by introducing a trial clamping position that allows operators to test the actual clamping force before full lifting operations. The turnable magnet can be positioned at a trial clamping angle (between 0° and 90°) to generate a predetermined trial clamping force, enabling safety verification in advance. This resolves the information loss by providing direct feedback on actual clamping capability under specific working conditions before committing to maximum force operations.
Solution Approach 2:
The patent implements feedback through the trial clamping mechanism that provides operational feedback to operators. When the workpiece is successfully clamped at the trial position, operators receive direct feedback that the actual clamping force meets safety requirements. This feedback loop eliminates the uncertainty about actual clamping force and enables informed decision-making for subsequent full-lifting operations.
2Ease of operation
If the turnable magnet is designed with multiple positioning mechanisms to enable trial clamping at intermediate positions, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rotation range of the turnable magnet into distinct functional segments: a first rotation range (0° to α) for trial clamping and a second rotation range (α to 90°) for maximum clamping. This segmentation is achieved through simple geometric constraints rather than complex mechanical positioning mechanisms. The housing structure itself provides the segmentation through its geometric features that limit rotation to specific angular ranges, avoiding the need for additional positioning components.
Solution Approach 2:
The patent employs self-service by using the inherent magnetic attraction between the turnable magnet and the workpiece to automatically maintain the magnet at the trial clamping position. Once the turnable magnet is rotated to the predetermined angle α, the magnetic force naturally holds it in position without requiring additional locking mechanisms or actuators. The system uses its own magnetic field to provide positional stability, eliminating the need for external positioning devices.
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 operators to safely determine if the maximum clamping force exceeds the workpiece weight ratio, thereby eliminating safety risks by allowing for controlled trial clamping within 10% to 90% of the maximum force, typically set at 50% for assurance.
Implementation Method 1
the magnetic force generated by the fixed magnet and the turnable magnet to the clamping surface is zero magnetic force; when the turnable magnet is in the third position relative to the fixed magnet, the magnetic force generated by the fixed magnet and the turnable magnet to the clamping surface is the maximum magnetic force
Data Source
Figure 1
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AI summary
The present invention provides a kind of permanent magnetic lifting device, which has: a housing, at the bottom of which is a clamping surface for clamping objects; fixed magnet(s), set in housing relatively fixed to housing; a turnable magnet, set in housing relatively turnable to fixed magnet. When turnable magnet is in the first position relative to fixed magnet, the magnetic force generated by fixed magnet and turnable magnet to clamping surface is zero magnetic force; when turnable magnet is in the third position relative to fixed magnet, the magnetic force generated by fixed magnet and turnable magnet to clamping surface is the maximum magnetic force. The permanent magnetic lifting device also has a positioning mechanism for second position. When the positioning mechanism for second position positions turnable magnet in the second position relative to fixed magnet, fixed magnet and turnable magnet generate trial clamping magnetic force to clamping surface for clamping objects on trial. The trial clamping magnetic force is higher than zero magnetic force and lower than maximum magnetic force. The permanent magnetic lifting device enables an operator to easily operate trial clamping, and also to know whether the ratio of the maximum clamping force that can be generated by the permanent magnetic lifting device under the specific condition to the weight of the workpiece equals or exceeds 2 times or 3 times or other specific values, and through operation of trial clamping, potential risk in safety can be thoroughly eliminated.