Study of diaphragm-valve pulsators of milking machines
Rotor pulsators of milking machines have a simple constructive-technological scheme, are easy to operate and have a low cost. The main disadvantage of this type of pulsators is the instability of the pulsation. Not all manufacturers of milking equipment indicate the recommended time to replace the membrane in the pulsators. They recommend the use of a constant number of pulses frequency from 52 to 62 of double strokes per minute, and the ratio of ticks sucking and compression from 60:40 to 65:35%. Pulsators should support the stereotype of milking with a high completeness of lactation. Experimental (histogram) and theoretical distribution of random variable parameters of the pulsator PM00001 and PM-1 with adjustable and non-adjustable frequency of pulsation are researched. The magnitude of the variances of the frequency of the pulsations, the ratio of ticks sucking and compression, phase of the sucking and compression is significant. Therefore, the values of their random variables to the mathematical expectations are located not tight. They have a significant scatter of random data that determines the instability of the parameters of pulsators during operation. Reference pulsators with adjustable and non-adjustable pulsation frequency with replacing the membranes have a narrow spread of random variables. During operation the membranes will not influence at the spread of the parameters. The mathematical expectation of the sample frequency of pulsation is increased in pulsators PM-1 on 12,5%, and in - PM00001 on 33%; the rhythm of sucking is increased in the PM-1 on 9%, and in PM00001 - 3%; the compression stroke is reduced in PM-1 on 13,5%, and in PM00001 - 6%. This can affect to the formation of the stereotype of machine milking. In addition, the dispersion of the random samples of the parameters will be increased in operation. Membranes replacement in the reference pulsators PM00001 and PM-1 with regulated and unregulated fluctuations did not affect to the change of pulsators parameters, that indicates the low technological level of pulsators production