Programmable Motor Control for Crankpin Diameter Checking
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Solution Overview
Problem
Existing apparatuses for checking diametral dimensions of pins in orbital motion lack flexibility in displacement speed control and rest position definition, particularly when dealing with varying rotation speeds and geometrical characteristics, leading to suboptimal cycle times and increased costs.
Innovation Solution
Incorporating a programmable electric motor and transmission mechanism allows for flexible speed control and precise positioning of the reference device, synchronizing with the pin's orbital motion to minimize mechanical impact and optimize cycle times, while maintaining contact through gravity-assisted engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic or pneumatic driving unit is used to control displacements, then the apparatus can achieve automatic displacement control, but the flexibility in speed control and rest position definition is limited
Solution Approach 1:
The patent replaces the hydraulic or pneumatic driving unit with a programmable electric motor. This substitution eliminates the complexity of fluid-based control systems while providing superior flexibility in speed control and rest position definition through programming capabilities, directly resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The programmable electric motor enables dynamic adjustment of displacement speed and rest position parameters through software programming. This allows the system to adapt to different pin rotation speeds and geometrical characteristics by simply changing program parameters, achieving high flexibility without increasing mechanical complexity
2Productivity
If the reference device displaces quickly towards the checking condition, then cycle time is reduced, but mechanical impact on the pin increases
Solution Approach 1:
The patent employs dynamic speed control of the reference device displacement through the programmable electric motor. The displacement speed can be adjusted in real-time to synchronize with the pin's orbital motion, allowing quick displacement when safe and slower displacement when proximity to the pin requires caution, thus resolving the contradiction between productivity and harmful mechanical impact
Solution Approach 2:
The system uses feedback from the pin's orbital motion characteristics to adjust the reference device displacement speed. By monitoring the pin's rotation speed and position, the control system optimizes the displacement timing and speed to minimize mechanical impact while maintaining efficient cycle times
3Measurement precision
If the apparatus is designed for specific pin characteristics, then measurement accuracy is optimized, but adaptability to different pin types is reduced
Solution Approach 1:
The patent designs the apparatus with universal adaptability through the programmable electric motor control system. The same hardware can accommodate different pin types, rotation speeds, and geometrical characteristics by programming appropriate displacement patterns, eliminating the need for multiple specialized apparatuses while maintaining measurement precision for each specific application
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 enhances accuracy, repeatability, and flexibility, reducing costs and environmental impact by simplifying the system, minimizing mechanical stress, and optimizing cycle times without the complexity of hydraulic systems.
Implementation Method 1
the control device comprises a programmable electric motor and a transmission mechanism
Implementation Method 2
maintaining the correct cooperation with the surface of the crankpin substantially due to the gravity
Data Source
Figure 1~2
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Figure 5~6
AI summary
An apparatus for checking the diameter of crankpins (15) of a crankshaft in orbital motion about a geometrical axis in a numerical control machine tool includes a V-shaped reference device (10), a measuring device (6) and a support device (4) fixed to the tool holding slide (2) that movably supports the reference device and the measuring device. A control device (50) for controlling automatic displacements of the apparatus towards and away from a checking condition, includes a programmable electric motor (60) and a transmission mechanism (62). The programmable electric motor is programmed to define a start position in which the automatic displacement of the apparatus away from the checking condition can be stopped, for instance a rest position or an intermediate position between the rest position and the checking condition. The programmable electric motor is also programmed to define a displacement speed and a checking method includes steps for controlling the automatic displacements towards the checking condition.