THE RESULTS OF RESEARCH PNEUMATIC ELECTROMAGNETIC PULSATOR COMBINED WITH COLLECTOR

. This article demonstrates the results of experimental research one of the pulsators. Its main difference from oth-ers is a pneumatic electromagnetic pulsator in combination with a collector. Therefore, this article describes in detail the process of studying the pulsator. The planned experiment was carried out on by Factorial experiments with multiple factors. The influence of factors (the ripple frequency n , the milk ejection q and the ratio between strokes t/T ) on the vacuum pressure in the inter wall chamber of teat cups was studied. The regression equation of the dependence response criterion on factors is modeled. This dependence is demonstrated graphically. Also there is a contour graph which is for more detailed information.


Introduction
To date, one of the major innovations on dairy farms around the world is the provision of adaptive milking (De Koning, 2010). But we also need to pay attention to the automation of individual components that are included in the general milking system. Automatic control milking equipment is quite favorable for cows (Pastell et al., 2006). The use of an automatic milking system saves labor (Floridi et al., 2013).
Alternate impact on the teat of the udder animal by mechanical compression and vacuum pressure is provided by a pulsator. The main criterion of researchers is to adapt the milking process to the animal as much as possible. The adaptation of the system to the animal is particularly influenced by vacuum pressure and ripple frequency, they determine the softness and speed of milking (Penry et al., 2016). The duration of milking time will decrease by 25% when changing the ratio between strokes from 50:50 to 70:30 with a constant ripple frequency of 1 Hz and the vacuum pressure in the system 42 kPa, but at a vacuum pressure of 51 kPa milking time is reduced by only 5% (Thomas et al., 1993). When conducting an experiment of certain components, the milking machine, the main attention is paid to the curve of milk ejection (Tancin et al., 2006). The pulsation coefficient of the milking machine affects the time of milk flow, milking time and the state of sucking (Ferneborg & Svennersten-Sjaunja, 2015). Researchers (Mein & Reinemann, 2007) state that the ripple frequency, the ratio between the strokes and vacuum level affect dominant on the milk ejection.
Therefore, in this research of a pneumatic electromagnetic pulsator combined with collector there are corresponding parameters. The values of these parameters were taken from the above-mentioned sources of reference and from the real operation of milking equipment.

Methodology
The purpose of this study is to determine the rational parameters of this pulsator. Investigate the main factors influencing its technological parameters. Conduct experiment planning. Make statistical processing over the results of the experiment. A second-order mathematical model must be constructed. Studies of the technological parameters of the pneumatic electromagnetic pulsator combined with collector were performed using a complete Factorial experiments. The response criteria is the vacuum pressure in the inter wall chamber of teat cups. The factors influencing the vacuum pressure in the inter wall chamber of teat cups are analyzed: the ripple frequency n, the milk ejection q and the ratio between the strokes t/T.
To study the influence of these factors, according to the matrix of the experiment (Table 1), their study was performed in triplicate. The experiment was performed on a developed stand for experimental research (Dmytriv et al., 2020).
The matrix of the experiment includes all possible combinations of levels variation of factors.   Figure 1. Scheme data transmission of vacuum pressure by digital signal: Pi -vacuum pressure in the under teats space; Pu -vacuum pressure in the wall chamber of teat cups; Pk -vacuum pressure in the collector; Pm -vacuum pressure in the milk hose Vacuum pressure values were recorded by intelligent pressure sensors. They were installed in the under teats space (Pi), in the wall chamber of teat cups (Pu), in the collector (Pk) and the milk hose (Pm). The digital code from the sensors is transmitted to the data receptiontransmission interface. Then the signal is sent to the central computer. On which the further information processing was carried out.
A detailed signaling scheme is shown in Figure 1.

Results of the research
According to the procedure (Dmytriv et al., 2020), the real and natural values of the regression equation coefficients were calculated, which are given in Table 2.
The regression equation that models the change in the vacuum pressure in natural factors will look like: where Pu -vacuum pressure in the wall chamber of teat cups, [kPa]; n -the ripple frequency, [Hz]; q -the milk ejection, [g/sec]; t/T -the ratio between the strokes. This equation of the dependence of the vacuum pressure on the factors is presented graphically in Figure 2.
In the Figure 3 is a contour graph which is for more detailed information. Figure 2 and Figure 3 graphically describe in detail the dependence of the regression model on the corresponding parameters of the pneumatic electromagnetic pulsator in combination with a collector. What is part of the milking machine.

Conclusions
This pulsator can work at the corresponding operating modes. During research the pulsator works at the set operating modes uninterruptedly. Operating modes and values of the main parameters can be changed during the experiment.
According to the regression model of vacuum pressure in the wall chamber of teat cups with respect to the studied factors (the ripple frequency, the milk ejection, the ratio between the strokes), it can be argued that this model is close to a linear form.
The vacuum pressure in the inter wall chamber of teat cups Pu, as the studied value, will acquire the lowest value (Pu ≤ 16 kPa) at the average values of three factors (the ripple frequency, n = 1 Hz; the milk ejection q = 39 g/sec and the ratio of strokes t/T = 1.5. However, it will increase to the maximum value (Pu ≥ 26 kPa) when the milk ejection reaches the maximum scale q = 45 g/sec, the ratio between the strokes (compression stroke to suction stroke) and the ripple frequency equal t/T = 1.5; n = 0.67 Hz.