RU1790879C - Milk control device in milking plant hose - Google Patents

Abstract

The invention relates to agriculture. The purpose of the invention is to increase the reliability and simplify the device. Inductive primary transducer 1 is mounted on a milk hose, one of its windings is connected to a generator 2, the other to a demodulator 3. When the generator 2 is operating, depending on the passage of milk, the signal in demodulator 3 has a certain amplitude, the value of which comparator 5 produces information signal. 2 ill.

Description

FIG. /

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The invention relates to agriculture.

The purpose of the invention is to increase the reliability and simplify the device.

In FIG. 1 shows an apparatus for controlling the flow of milk in a milk hose of a milking unit; Fig. 2 is a timing diagram illustrating the operation of the device.

The milk control device in the milk hose contains an inductive primary converter 1, including a transformer converter, the primary winding of which is connected to the output of the generator 2, a demodulator 3, the input of which is connected to the secondary winding of the primary converter, and the output of which is through the sensitivity adjustment element to the input of amplifier 4; the output is connected to the first input of the comparator 5, the voltage from the reset threshold adjustment element is applied to the second input of the comparator. The primary transducer is located directly on the milk hose so that the primary and secondary windings are aligned with each other on opposite sides.

The device operates as follows. -.

In the initial state (when milk does not pass through the milk hose), the high-frequency oscillations of the RF generator (diagram in Fig. 2) are supplied to the primary winding of the primary converter 1 located on one side of the milk hose; The HF oscillations induce an EMF (plot b in Fig. 2) on the secondary side of the primary transducer 1, which is opposite the primary on the opposite side. This EMF is supplied to the input of demodulator 3, in which RF waves are detected and integrated into a constant signal. This signal through the adjustment element is fed to the input of amplifiers 4; the ability to adjust the sensitivity makes it possible to take into account the scatter of the parameters of the inductive primary converter T. The amplified signal from the output of the amplifier 4 is fed to one input of the comparator 5, the other input of which from the control element 6 is supplied with the comparator operating voltage (diagram from Fig. 2). This makes it possible to adjust

devices depending on the degree of filling of the milk hose (cross section) in the area of the primary Converter 1. In particular, this makes it possible to make the device

insensitive to milk foam, as the density of milk foam is lower than the density of milk. The output of the comparator low potential (plot d figure 2).

When milk flows through the milk

the EMF hose on the secondary winding of the primary transducer 1 changes (plot b of FIG. 2) since milk has poor electrical conductivity. This signal is detected by the demodulator 3, amplified by the unit

4, and enters the input of the comparator 5 (plot from figure 2). By selecting the dropping threshold (diagram from FIG. 2) of the comparator 5, the influence of milk foam, which appears due to the violation of operating modes, can be completely eliminated.

milk line (the presence of anti-inclinations along the path of milk flow, the presence of air leaks). At the same time, a high potential is established at the output of the comparator 5 (plot d of Fig. 2). All this improves the accuracy of the device for controlling the flow of milk in the milk hose. There are no additional requirements for the transparency of the milk hose or the condition of its inner wall, as the fats deposited on the inner wall of the milk hose very slightly change the degree of interaction of the primary and secondary windings of the primary converter, because

the internal section is an insignificant part.

Claims (1)

SUMMARY OF THE INVENTION A device for monitoring milk in a milk hose of a milking unit, comprising an inductive primary converter, the winding of which is connected to the output of the generator, a demodulator, an amplifier and a comparator, to the installation input which is connected with a threshold adjustment element, characterized in that, in order to increase the reliability and simplify the device, the inductive primary converter is equipped with an additional winding which is connected to the input of the demodulator, the latter being connected via an amplifier to the corresponding input of the comparator. FIG. 2. 4