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Research Papers

New Liquid Transfer Active Balancing System Using Compressed Air for Grinding Machine

[+] Author and Article Information
Pan Xin

Beijing Key Laboratory of Health Monitoring
and Self-Recovery for High-End
Mechanical Equipment,
Beijing University of Chemical Technology,
No.15, North Sanhuan East Road,
P.O. Box 130,
Chaoyang District,
Beijing 100029, China
e-mail: panxinyes@163.com

Wu Haiqi

Beijing University of Chemical Technology,
No.15, North Sanhuan East Road,
P.O. Box 130,
Chaoyang District,
Beijing 100029, China
e-mail: wuhaiqi666@126.com

Gao Jinji

Beijing Key Laboratory of Health Monitoring
and Self-Recovery for High-End
Mechanical Equipment,
Beijing University of Chemical Technology,
No.15, North Sanhuan East Road,
P.O. Box 130,
Chaoyang District,
Beijing 100029, China
e-mail: gaojinji@263.net

Wang Weimin

Beijing University of Chemical Technology,
No.15, North Sanhuan East Road,
P.O. Box 130,
Chaoyang District,
Beijing 100029, China
e-mail: wwmbuct@163.com

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received January 8, 2014; final manuscript received July 12, 2014; published online November 12, 2014. Assoc. Editor: Ryan L. Harne.

J. Vib. Acoust 137(1), 011014 (Feb 01, 2015) (8 pages) Paper No: VIB-14-1005; doi: 10.1115/1.4028507 History: Received January 08, 2014; Revised July 12, 2014; Online November 12, 2014

Grinding wheel unbalance will result in vibrations of grinding machines and affect the quality and precision of workpieces. Therefore, a balancing system is necessary for grinding machines to lower the vibrations caused by unbalance. In this study, a liquid transfer active balancing system, in which the balancing liquid was forced by compressed air to transfer between opposite chambers, was applied to the high-speed grinding spindle. The requirements of gas pressure and linearity of balancing ability were analyzed to confirm the feasibility of the proposed device. In addition, an active balancing experiment was also carried out efficiently during the operation.

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References

Figures

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Fig. 1

Principle of active balancing device. (a) Before balancing and (b) after balancing.

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Fig. 2

Schematic diagram of active balancing system: Label 1 grinding wheel; Label 2 connecting flange; Label 3 drive shaft; Label 4 acceleration sensor; Label 5 displacement sensor; Label 6 speed sensor; Label 7 control unit; Label 8 air source; Label 9 air filter; Label 10 pressure reducing valve; Label 11 electromagnetic valve block; Label 12 air distributor; and Label 13 balancing disk

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Fig. 3

Schematic of balancing disk. (a) Balancing chambers and (b) connecting tubes in cover plate.

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Fig. 4

Schematic of air distributor. (a) Graphic model and (b) construction drawing.

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Fig. 5

Schematic of chambers and connecting tube R1′ inner radius of liquid ring; R2 outer radius of liquid ring; p0 gas pressure of chamber A; u velocity of flow in connecting tube; and r1, r2, r3 radius of two ends and center for the connecting tube.

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Fig. 6

Results of gas pressure analysis. (a) Minimum of gas pressure at 6000 rpm and (b) gas pressure at the center of connecting tube.

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Fig. 7

Schematic of liquid ring

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Fig. 8

Experimental setup for balancing work. (a) Experimental setup for the whole balancing system and (b) experimental setup for the balancing actuator.

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Fig. 9

Block diagram of active balancing system

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Fig. 10

Balancing results at 3000 rpm and 5000 rpm

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Fig. 11

Repeatability results of balancing device

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Fig. 12

Balancing results at 5500 rpm

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