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首页> 外文期刊>Journal of dairy research >Factors affecting mouthpiece chamber vacuum in machine milking
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Factors affecting mouthpiece chamber vacuum in machine milking

机译：影响机器挤奶时烟嘴腔真空度的因素

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The vacuum in the mouthpiece chamber (MPC) was measured in a factorial trial with two liners (DeLaval 964008-01 and DeLaval 999007-03), two pulsator ratios (60 and 70%) and morning and evening milking over eight milkings of ten cows. Teat length and diameter were measured before and after milking, and maximum milk flow rate and depth of penetration of the teat into the teatcup were also recorded. The MPC vacuum at peak flow rate was classified as stable, at various levels, in 79% of the recordings. In the rest of the milkings the vacuum declined gradually, and this decline was associated with gradually deeper penetration of the teat into the teatcup. The DeLaval 964008-01 liner with the narrower bore and larger mouthpiece opening gave lower MPC vacuum at peak flow rate than did the wider bore DeLaval 999007-03 with the smaller mouthpiece opening. Morning milking gave higher MPC vacuum than evening milking. Increased maximum milk flow rate and increased length and diameter of the teat gave decreased MPC vacuum. The teats were longer before milking in the morning than in the evening. However, during peak flow rate, the teats had penetrated deeper into the teatcup in the evening than in the morning. A marked change in MPC vacuum in the transition to the period of flow rate can be used to identify the start of over-milking of an individual teat. A general model explaining the MPC vacuum as the outcome of the balance between air leakage past the mouthpiece lip and the leakage past the teat in the liner barrel is suggested.
机译：在一项析因试验中，使用两个衬管（利拉伐964008-01和利拉伐999007-03），两个脉动比（分别为60％和70％）和早晚挤奶，对十头奶牛进行了八次挤奶，测量了烟嘴腔内的真空。在挤奶之前和之后测量奶头的长度和直径，并记录最大奶流量和奶头进入奶杯的深度。在79％的记录中，峰值流速下的MPC真空在各种级别上均被归类为稳定。在其余的挤奶过程中，真空度逐渐下降，而这种下降与奶头逐渐深入到奶杯中有关。具有更窄孔和更大吸口开口的DeLaval 964008-01衬管在峰值流速下的MPC真空度比具有较小吸嘴开口的较宽口径的DeLaval 999007-03更低。早上挤奶比晚上挤奶具有更高的MPC真空度。最大奶流量增加，奶嘴长度和直径增加，MPC真空度降低。早晨挤奶之前的乳头要长于晚上。但是，在峰值流量期间，晚上的奶头比早上的奶头更深。 MPC真空向流量周期过渡期间的显着变化可用于识别单个奶嘴开始过度挤奶。建议使用一个通用模型来解释MPC真空度，该数值是通过口舌泄漏的空气与通过内胆桶中的奶嘴泄漏之间的平衡的结果。

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