Double-shaft Electric Bolt Tightener for Variable Pitch Propellers
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Solution Overview
Problem
Current wind power variable propeller pitch devices face issues with noise, vibration, uneven torque, precision uncertainty, and human resource inefficiency due to the use of pneumatic and hydraulic tools for bolt tightening.
Innovation Solution
A double-shaft variable propeller pitch electric bolt-tightening machine is designed with a servomotor, servo rotating table, pneumatic device, lift platform, angle adjusting meter, and automatic nut-identification and reaction force device, enabling precise positioning and uniform force application for simultaneous diagonal bolt tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If pneumatic impact wrench and hydraulic wrench are used to tighten bolts, then tightening operation can be performed, but noise and vibration increase
Solution Approach 1:
The patent replaces pneumatic and hydraulic wrenches with an electric bolt-tightening machine that uses a servomotor to drive the tightening process. This substitution eliminates the noise and vibration associated with pneumatic and hydraulic systems while maintaining effective bolt tightening capability through controlled electric motor operation.
Solution Approach 2:
The patent uses a pneumatic device specifically for clamping the propeller pitch device during tightening, separating the clamping function (where pneumatic is appropriate) from the tightening function (where electric servomotor is used). This selective application resolves the contradiction by using pneumatic only where beneficial while avoiding its harmful noise and vibration effects in the tightening operation.
2Manufacturing precision
If pneumatic impact wrench and hydraulic wrench are used to tighten bolts, then tightening operation can be performed, but tightening precision becomes uncertain
Solution Approach 1:
The patent replaces pneumatic and hydraulic wrenches with an electric bolt-tightening machine featuring a servomotor and microcomputer control system. This substitution enables precise control of tightening parameters including torque, rotation speed, and position, thereby ensuring consistent and accurate tightening precision while maintaining operational capability.
Solution Approach 2:
The patent incorporates a microcomputer control system that monitors and controls the tightening process parameters. This feedback mechanism ensures precise control over torque application, rotation speed, and positioning, eliminating the precision uncertainty inherent in manual or semi-automatic pneumatic/hydraulic systems.
3Object-generated harmful factors
If pneumatic impact wrench and hydraulic wrench are used to tighten bolts, then tightening operation can be performed, but local deformation occurs on the propeller pitch device
Solution Approach 1:
The patent replaces high-impact pneumatic and hydraulic wrenches with a controlled electric servomotor system that applies torque gradually and uniformly. This substitution eliminates the shock loads and impact forces that cause local deformation, while maintaining effective tightening capability through precise motor control.
Solution Approach 2:
The patent uses a servomotor with microcomputer control to dynamically adjust tightening parameters in real-time, controlling rotation speed, torque, and position throughout the tightening process. This dynamic control prevents sudden force application that would cause local deformation, ensuring uniform stress distribution on the propeller pitch device.
4Productivity
If traditional tightening tools are used, then tightening operation can be performed, but human cost increases
Solution Approach 1:
The patent employs an automatic bolt-tightening machine that autonomously performs positioning, clamping, and tightening operations without requiring manual intervention for each bolt. The microcomputer control system automatically manages the entire tightening process, eliminating the need for skilled operators and reducing human labor costs while maintaining high productivity.
Solution Approach 2:
The patent extracts the human operator from the tightening process by implementing full automation. The machine independently handles all tightening operations including positioning, clamping, torque application, and quality verification, completely removing the need for human involvement in the actual tightening operation and thereby eliminating associated human costs.
5Manufacturing precision
If simultaneous diagonal bolt tightening is implemented, then mounting precision improves, but device complexity increases
Solution Approach 1:
The patent uses a double-shaft design with two independent tightening shafts that can operate simultaneously on diagonal bolts. This segmentation of the tightening function into two independent but coordinated shafts enables simultaneous diagonal bolt tightening, improving mounting precision through balanced force application while managing complexity through modular shaft design.
Solution Approach 2:
The patent merges the positioning, clamping, and tightening functions into an integrated automated system controlled by a single microcomputer. This consolidation of multiple functions into one coordinated system enables simultaneous diagonal bolt tightening without proportionally increasing overall device complexity, as the control system manages multiple shafts and operations through unified programming.
Data Source
Figure 1~2
AI summary
A double-shaft variable propeller pitch electric bolt-tightening machine, comprising: a base body front end (1), a base body rear end (2), a servomotor (3), a servo rotating table (4), a servo feeding table (5), a pneumatic device (6), a main machine base (7), a lifter (8), a lift adjusting guide rod (9), a plurality of supporting rods (10), a lift platform (11), an angle adjusting meter (12), a bearing platform (13), a rotary servomotor (14), an output rotating shaft (15), a centring device (16), a rotating arm (17), a sliding lead screw (18), a tightening servomotor (19), and an automatic nut-identification and reaction force device (20). The present invention has the advantages of simple operation, high tightening precision, uniform pressing force, time-and-labor saving, low noise and no vibration. The present invention can tighten diagonal bolts on a variable propeller pitch device simultaneously and ensure the mounting precision of the variable propeller pitch device without deforming the variable propeller pitch device.