Anti-Wear Design of the Knot-Tripping Mechanism and Knot-Tying Test for the Knotter
Abstract
:1. Introduction
2. Structure and Working Process of the Knot-Tripping Mechanism
3. Establishment of the Prediction Model for Cam-Roller Wear
3.1. Establishment of the Calculation Model for Cam Wear
3.2. Replacement of Worn Cam Profile
4. Design of the Knot-Tripping Mechanism with the Curved Cam
4.1. Establishment of the Coordinate System of the Roller Motion
4.2. Establishment of Theoretical Contour Equation for Curved Cam
4.3. The Comparison of Mechanical Properties between the Knot-Tripping Mechanism with Planar Cam and the Knot-Tripping Mechanism with Curved Cam
4.3.1. The Comparison of Pressure Angle of the Knot-Tripping Mechanism
4.3.2. The Comparison of Cam-Roller Contact Force
5. Calculation Results and Test Verification of the Knot-Tripping Mechanism
5.1. The Calculation Results of the Wear Model and Wear Test
5.2. Comparison and Analysis of the Wear Model Calculation Results and the Test Tesults
6. Conclusions
- (1)
- A kinematic model of the spatial knot-tripping mechanism is established, and a line-contact curved cam mechanism with the cutter arm swinging according to the sinusoidal acceleration is designed, which significantly reduces the contact force between the planar cam and the spherical roller of the original knot-tripping mechanism and eliminates the impact between the roller and the cam.
- (2)
- The wear test results of the knot-tripping mechanism of the aluminum cam show that, when the twine tension is 120 N and the spindle speed is 60 rpm, the wear of the curved cam is reduced by 43%, 56%, 46%, and 37%, respectively, compared with the planar cam for 200, 600, 1300, and 2000 knots. The errors between the calculated and measured wear values of the curved cam are 9.48%, 6.01%, 7.27%, and 9.95%, respectively. The effectiveness of the spatial cam-roller wear model and the correctness of the curved cam design are verified.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Number of Knots | 200 | 600 | 1300 | 2000 |
---|---|---|---|---|
Calculated wear of planar cam (mm) | 0.489 | 0.965 | 1.391 | 1.753 |
Measured wear of planar cam (mm) | 0.444 | 0.850 | 1.166 | 1.419 |
The deviation between the calculated wear value and the measured wear value of planar cam (%) | 9.65 | 12.67 | 17.60 | 21.59 |
Calculated wear of curved cam (mm) | 0.231 | 0.355 | 0.583 | 0.812 |
Measured wear of curved cam (mm) | 0.254 | 0.377 | 0.627 | 0.897 |
The deviation between the calculated wear value and the measured wear value of curved cam (%) | 9.48 | 6.01 | 7.27 | 9.95 |
Reduced wear of curved cams relative to planar cams (%) | 43 | 56 | 46 | 37 |
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Lv, S.; Chen, Y.; Yin, J.; Zhou, M.; Chen, Z. Anti-Wear Design of the Knot-Tripping Mechanism and Knot-Tying Test for the Knotter. Lubricants 2023, 11, 475. https://doi.org/10.3390/lubricants11110475
Lv S, Chen Y, Yin J, Zhou M, Chen Z. Anti-Wear Design of the Knot-Tripping Mechanism and Knot-Tying Test for the Knotter. Lubricants. 2023; 11(11):475. https://doi.org/10.3390/lubricants11110475
Chicago/Turabian StyleLv, Shiyu, Yaming Chen, Jianjun Yin, Maile Zhou, and Zefu Chen. 2023. "Anti-Wear Design of the Knot-Tripping Mechanism and Knot-Tying Test for the Knotter" Lubricants 11, no. 11: 475. https://doi.org/10.3390/lubricants11110475