Electric Actuator Damping and Relay Control for Pressing Shock
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Solution Overview
Problem
Conventional electric actuators deteriorate in durability due to shock and impact during pressing operations, and require complex control systems and expensive detectors to manage position and speed, increasing production costs.
Innovation Solution
An actuator control system with a piston and piston rod that uses end and piston dampers, a flexible coupling mechanism, and a simple relay circuit to absorb impact and limit current, eliminating the need for expensive detectors and complex control circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electric actuators are used for pressing operations, then the actuator can perform the pressing function, but the shock and impact during operation deteriorate the durability of the actuator
Solution Approach 1:
The patent introduces a damper mechanism that is pre-installed in the actuator system to absorb shock and impact before they can reach and damage the screw shaft and other critical components. The damper is positioned to cushion the piston rod against sudden impacts during pressing operations, thereby protecting the actuator's durability without requiring complex control systems.
2Measurement precision
If detectors such as encoders and resolvers are provided to control position and operation speed, then the control precision is improved, but the production cost becomes expensive
Solution Approach 1:
The patent extracts and removes the complex and expensive detectors (encoders, resolvers) from the actuator system. Instead, it employs a simple relay circuit that detects the actuator's state through basic electrical signals, thereby achieving adequate control functionality without the high production costs associated with precision detectors.
Solution Approach 2:
The patent replaces expensive, complex detectors with a simple, inexpensive relay circuit. The relay circuit provides sufficient control capability for the pressing operation without requiring the high-precision measurement components, thus significantly reducing production costs while maintaining functional adequacy.
3Ease of manufacture
If a simple relay circuit is used instead of complex control systems, then the production cost is reduced, but the ability to control current and protect the rotary driving source may be insufficient
Solution Approach 1:
The patent introduces a current-limiting resistor as an intermediary component in the relay circuit. This resistor acts as a mediator that automatically limits the current flowing to the rotary driving source, providing protection without requiring complex control electronics. The resistor dissipates excess energy as heat, thereby protecting the motor from overcurrent damage while keeping the circuit simple and inexpensive.
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 system effectively absorbs impact, maintains durability, and reduces production costs by simplifying the control circuit, allowing for efficient operation without complex detectors, thus preventing damage to the rotary driving source.
Implementation Method 1
a piston damper (56a, 56b) made of an elastic material
Implementation Method 2
effectively absorbs impact, enhances durability
Implementation Method 3
an end damper (36a, 36b) provided for the housing (12) and the rod cover (16)
Implementation Method 4
absorb impact, enhances durability
Implementation Method 5
a flexible coupling mechanism
Data Source
AI summary
An actuator control system comprises an electric actuator, a driver, and a controller. The electric actuator is provided with a buffering mechanism which absorbs impact applied to a piston rod. The buffering mechanism includes piston dampers which absorb impact applied to a piston, a first end damper which is provided at an end of a housing facing the piston, and a second end damper which is provided on a rod cover separated from the housing by a predetermined distance.