Research Papers: Applications

Configuration of Noncontact Grip System for Carrying Large Flat Sheets Using Vacuum Air Heads

[+] Author and Article Information
Joon Hyun Kim

Department of Mechanical
and Automotive Engineering,
Seoul National University of Science and Technology,
232 Gongneung-ro,
Nowon-gu 139-743, South Korea
e-mail: joonk61@seoultech.ac.kr

Se-Jin Lee

Division of Mechanical
and Automotive Engineering,
Kongju National University,
1223-24, Cheonan-daero, Seobuk-gu,
Cheonan-si 330-710,
Chungcheongnam-do, South Korea
e-mail: sejiny3@kongju.ac.kr

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 24, 2014; final manuscript received April 16, 2015; published online July 9, 2015. Assoc. Editor: Min Zou.

J. Tribol 137(4), 041103 (Oct 01, 2015) (8 pages) Paper No: TRIB-14-1289; doi: 10.1115/1.4030710 History: Received November 24, 2014; Revised April 16, 2015; Online July 09, 2015

This paper configured an improved grip system for gripping and transferring large flat sheets in a noncontact manner. The conventional method for changing the direction of large flat sheets in a conveyor system is to turn the system itself. The new configured grip system applied a noncontact pneumatic head in the vertical direction, with the use of an air levitation table, and L-shaped latches, to lift and rotate large flat sheets to change their direction in the conveyor system. The pneumatic heads made efficient use of a vortex flow and an internal flow guide to improve the swirling flow. The gripping force for the improved head with the inner flow guide was 10% higher than that for the conventional head. To construct a rotational grip system, 12 improved noncontact heads and eight pairs of L-shaped latches were used to provide gripping force against an eight generation liquid crystal display (LCD) glass as a 4:6 ratio, each other. With a partial levitation force from the air blow table, the head-and-latch configuration resulted in the overall glass flatness approaching within 3.0 mm on the lower side at a selected grip rotation height of 40 mm.

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Fig. 1

Basic configuration of air floating conveyor

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Fig. 2

Schematic view of vortex flow inside the head

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Fig. 3

Factors affecting performance of a noncontact head

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Fig. 4

Sectional view of head with an internal flow guide

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Fig. 5

Computational domain

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Fig. 6

Pressure distribution according to gap distance (e)

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Fig. 7

Net force (excluding weight) on sample surface according to gap distance

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Fig. 8

Pressure distribution according to internal head height (i.e., depth)

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Fig. 9

Pressure distribution according to working pressure

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Fig. 10

Velocity contours in vertical single layer

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Fig. 11

Pressure distribution with application of curved flow guide

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Fig. 12

Measurement of noncontact gap distance under various working pressures using a microcamera

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Fig. 13

Schematic view of rotational grip system with heads

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Fig. 14

Glass deflection versus discharge velocity of air blow unit

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Fig. 15

Frame structure with multiple heads and cylinder-type latches

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Fig. 16

Comparison of deflection when frame was lifted without and with partial or full levitation applied

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Fig. 17

Glass deflection according to lifting force per head at both edges and center region



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