Bolt Fastening Assembly With Tension Rod and Force Feedback
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Solution Overview
Problem
Current bolt fastening processes lack automation, leading to inefficiencies and potential damage to mechanical structures during assembly.
Innovation Solution
A fastening device featuring a tension rod with a female screw section that engages with a bolt head male screw section, a motor system for controlled rotation, and a sensor to monitor compression force, allowing for precise and automated tightening of bolts with matching screw pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual bolt fastening is used, then operation flexibility is maintained, but automation level is low and assembly efficiency is reduced
Solution Approach 1:
The fastening device is divided into functionally independent modules: a tension rod module for applying axial force, a rotation module for rotating the bolt, and a supporter module for providing structural support. This segmentation allows each module to perform its specific function efficiently while maintaining overall automation capability.
Solution Approach 2:
The tension rod acts as an intermediary component that transmits rotational motion from the rotation module to the bolt while simultaneously applying controlled axial tension. This intermediary mechanism enables automated fastening by mediating between the motor-driven rotation system and the bolt being fastened.
2Productivity
If automated fastening is implemented, then assembly efficiency is improved, but control precision of tightening force is required
Solution Approach 1:
The device incorporates a sensor that detects compression force acting on the supporter in the upward/downward direction. This feedback mechanism allows the control system to monitor and adjust the tightening force in real-time, ensuring precise control of the fastening process while maintaining high assembly efficiency.
Solution Approach 2:
The screw pitch parameters of the rod female screw section and bolt head male screw section are designed to match, enabling controlled translation of rotational motion into precise axial displacement. This parameter matching ensures that the automated rotation translates directly into controlled tightening force application.
3Ease of operation
If tension rod rotates during fastening, then bolt tightening is achieved, but uneven surface pressure may damage mechanical structures
Solution Approach 1:
The supporter structure is designed to counterbalance the axial forces generated during bolt rotation and tightening. By providing a stable counterweight support system, the device maintains even surface pressure distribution on the mechanical structure, preventing damage while enabling effective tightening operation.
Solution Approach 2:
The supporter is positioned to circumferentially surround the tension rod and has a lower end section that protrudes downward beyond the tension rod, creating a protective cushioning structure. This pre-positioned support system absorbs and distributes forces before they can cause damage to the mechanical structure during the tightening process.
4Stability of the object's composition
If supporter extends beyond tension rod, then structural stability is improved, but device complexity increases
Solution Approach 1:
The supporter serves multiple functions: it provides structural stability by extending beyond the tension rod, acts as a mounting structure for sensors, and functions as a protective element during the fastening process. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity.
Data Source
AI summary
A fastening device for fastening a bolt to a fastening target object, wherein the bolt has a bolt head female screw section in an inner circumferential surface of a recess provided in an upper surface of a bolt head section. The fastening device includes a tension rod having a rod male screw section engaging the bolt head female screw section; a drive socket circumferentially surrounding the tension rod and having a lower end section with a grasper for laterally grasping the bolt head section; a supporter circumferentially surrounding the drive socket and having a lower end section protruding downward beyond a lower end section of the drive socket; a sensor for sensing compression force acting on the supporter in the upward/downward direction; a first motor for rotating the tension rod around an axis extending in the upward/downward direction; and a second motor for rotating the drive socket around the axis.