Design and fabrication of tripping mechanism for mango sizer using air compressor and solenoid valve.

Date

3-2010

Degree

Bachelor of Science in Agricultural Engineering

Major Course

Major in Agricultural and Bio-Process Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Kevin F. Yaptenco

Committee Member

Pepito M. Bato, Marvic C. Petingco

Abstract

Manual sorting and sizing of mangoes around the country give several disadvantages like require large manpower, necessitate money, utilize plenty of time, involve inconsistency, and require familiarization and experience in sizing the fruit. Hence, a low cost sizer must be used. The objectives of the study were to design and to fabricate a tripping mechanism for mango sizer using a compressed air and solenoid valve and to evaluate the performance of tripping mechanism, which could be used as an alternative tripping mechanism for electronic mango sizer. This design was also fabricated and tested for its grading efficiency. The designed mango sizer was dimensioned into four different mass classes: small (200-249g); medium (250-299g); large (300-349g); and extra large (>350g). Water-filled plastics as mango substitutes which represented each mass class were subjected to sizing to evaluate the efficiency of the trigger when used for the sizer. Sixty samples were made, each class having 15 samples, and were subjected to the trigger evaluation. The evaluation process was done to know whether the samples were true positive (both the expected and the observed tray should tilt), true negative (expected to tilt but did not tilt), false positive (both the expected and observed tray should not tilt) and false negative (expected not to tilt but the tray tilted). With the use of Chi Square Goodness of Fit Test for statistical analysis with an assumed machine error of 1%, the computed chi square was 12.67 and the tabular value was 30.58. The results showed that there were no significant differences between the observed frequency distribution and the expected distribution values since the computed test statistic was less than the tabular value. The designed machine performed its function properly 99% of the time and can be used as a tripping mechanism for the PHTRC mango sizer.

Language

English

Location

UPLB Main Library Special Collections Section

Document Type

Thesis

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