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Liner Wall Movement and Vacuum
Measured by Data Acquisition |
The objective of this study was to measure liner
wall movement and defines the characteristics of pulsation. The
cyclic opening and closing of the milking machine liner is called
“Pulsation.” The liner opening and closing is a consequence
of the differential pressures across the walls of the liner barrel.
Liner wall movement was measured in the laboratory and during
milking with an analogue laser sensor and a laptop computer equipped
with a data acquisition system. Measurements were made in 10-s
segments. The first and last cycles of 10 pulsations were dropped
from each segment, and the average of eight cycles was used for
final analysis.
Opening and closing phases of liner wall movement were characterized
at the intersection of 1mmless than fully open and 1 mm greater
than fully closed. The ‘D’ phase of the liner was
407 ms, in contrast to the ‘d’ phase of the chamber
vacuum of 259 ms with an artificial teat.
Time of liner opening averaged 87 ms with an artificial teat and
98 ms during milking. Liner closure time was 23 ms with an artificial
teat and 42 ms during milking.
Liner ratio was 57:43, with a chamber vacuum ratio of 65:35 using
an artificial teat. Liner ratio was 58.2:41.8 with a chamber ratio
of 64.5:35.5 during milking. This technology can be used to improve
liner design and enhance milking performance.
(Key words: data acquisition, liner, vacuum)
Abbreviation key: CCPD = critical collapsing pressure difference,
TPPD = touch point pressure difference. |
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