Contact Safety Nut Mechanism for Stable Linear Actuator Failover
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Solution Overview
Problem
Existing linear actuators in aerial work platforms face safety and accuracy issues due to sudden nut failures, leading to potential hazards and position errors when safety nuts are engaged, causing vibrations and damage.
Innovation Solution
A contact type safety nut mechanism with a central screw, a driving nut mechanism, and a safety nut mechanism, where an elastic ball mechanism maintains continuous connection with the central screw during normal operation, preventing sudden engagement and ensuring stability and accuracy when the driving nut fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the safety nut mechanism is kept separated from the central screw during normal operation, then the driving nut mechanism can operate without interference, but when the safety nut engages suddenly upon failure, violent impact occurs causing damage to the central screw and safety nut mechanism
Solution Approach 1:
The patent applies beforehand cushioning by introducing a elastic buffer element that continuously buffers the connection between the safety nut mechanism and central screw. This elastic buffer absorbs impact energy before violent engagement occurs, preventing damage to both the central screw and safety nut mechanism while maintaining reliable safety protection.
2Reliability
If the safety nut mechanism is kept separated from the central screw, then normal operation is not affected, but position error increases when the safety nut connects to the central screw
Solution Approach 1:
The patent uses an elastic buffer element as an intermediary between the safety nut mechanism and central screw. This intermediary maintains continuous contact without rigid connection, allowing the safety mechanism to remain engaged for position monitoring while avoiding the violent impact and position errors associated with sudden engagement.
3Reliability
If the safety nut is connected to the central screw via screw threads, then connection is achieved, but obvious position error in the axial direction occurs after connection
Solution Approach 1:
The patent replaces the traditional screw thread mechanical connection with an elastic buffer-based continuous contact mechanism. This substitution eliminates the axial position errors inherent in threaded connections while maintaining reliable connection between the safety nut mechanism and central screw.
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 design ensures continuous safety, stability, and accuracy of the linear actuator's operation, preventing damage and position errors when the driving nut mechanism fails, allowing the actuator to complete tasks safely and maintain precision.
Implementation Method 1
an elastic buffer element is arranged in each of the limit hole channels
Implementation Method 2
the safety ball is capable of rolling along the screw raceway and moving along the corresponding limit hole channel
Data Source
AI summary
The present disclosure relates to the technical field of aerial work platforms, in particular to a linear actuator with a contact type safety nut, and an aerial work platform. The linear actuator includes a central screw, a driving nut mechanism, and a safety nut mechanism. The central screw has a screw raceway. The safety nut mechanism includes a safety nut seat sleeved at the periphery of the central screw. Limit hole channels pointing to the central screw are arranged on the safety nut seat. An elastic buffer element is arranged in each of the limit hole channels. A safety ball is arranged between the elastic buffer element and the central screw. The contact type safety nut enables the linear actuator to always keep safety, stability, and no loss of accuracy in a conversion process that the safety nut mechanism gets involved to take effect while the driving nut mechanism fails.