Robot Mechanical Stopper Lever Elastic Buffer Impact Absorption
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Solution Overview
Problem
Existing mechanical stopper devices in industrial robots fail to adequately prevent damage to the robot and its end effector from excessive rotation, leading to potential failure and origin displacement, especially during high-speed runaway situations, and have a limited lifespan due to wear and impact-related issues.
Innovation Solution
A mechanical stopper device with a lever capable of swinging about a fulcrum, paired with elastic bodies that absorb impact forces by adjusting the ratio of distances and thickness to ensure proper running distance and durability, preventing excessive load on the end effector and extending the device's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical stopper device is provided to prevent unlimited rotation, then wire breakage is prevented, but excessive impact force damages the stopper device and end effector
Solution Approach 1:
A rubber buffer is provided between the stopper member and the rotating body to absorb impact energy before it reaches the mechanical components. The buffer is positioned at the stopper position to cushion the shock when the rotating body reaches the predetermined rotation angle, preventing direct impact on the stopper device and end effector.
Solution Approach 2:
The rubber buffer acts as an intermediary element between the hard mechanical components (stopper member and rotating body). This soft intermediate material absorbs and dissipates impact energy through deformation, protecting both the stopper device structure and the end effector from excessive impact forces.
2Ease of operation
If a sliding portion is used in the mechanical stopper device, then rotation control is achieved, but the sliding portion wears away reducing device lifespan
Solution Approach 1:
The invention replaces the traditional sliding contact mechanism with a buffer-based stopping mechanism. Instead of relying on sliding portions that wear through friction, the system uses a rubber buffer to absorb impact energy, eliminating the sliding contact and its associated wear problems, thereby extending device lifespan.
3Object-affected harmful factors
If an elastic body is used to reduce wear, then sliding wear is reduced, but the elastic body breaks off under excessive impact force
Solution Approach 1:
The invention uses a rubber buffer material that combines the benefits of elasticity (for wear reduction) with high impact resistance. The rubber material is specifically selected to provide both cushioning properties to reduce wear on sliding portions and sufficient strength to withstand excessive impact forces without breaking off.
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 mechanical stopper device effectively absorbs impact forces, preventing damage to the robot and its end effector, and extends the device's lifespan by properly managing the ratio of distances and thickness of the elastic bodies, ensuring reliable operation and reduced maintenance needs.
Implementation Method 1
a pair of elastic bodies 25 capable of being abutted with both side surfaces in the swinging direction of the lever 24
Implementation Method 2
the elastic bodies being capable of being abutted with both side surfaces in the swinging direction of the lever, the rotating body includes a movable side stopper capable of being abutted with both the side surfaces of the lever
Data Source
AI summary
A mechanical stopper device wherein a fixed body includes a fixing-side stopper, including: a lever that can swing about a supporting shaft provided to the fixed body; and a pair of elastic bodies, attached to the fixed body, on both sides in the lever swinging direction, and which can contact with both side surfaces of the lever. Further, a rotating body includes a stopper pin that can be in contact with both the side surfaces of the lever. The ratio between a distance (a) from a supporting point of the lever to a contact position where the lever and the stopper pin are in contact with each other, and a distance (b) from the supporting point of the lever to a contact position where the lever and the elastic bodies are in contact with each other is 1.05≤a/b≤2.30, and thickness (D) of the elastic bodies is 20 mm≤D≤40 mm.