COW MILKING UNIT Russian patent published in 1997 - IPC

FIELD: agriculture. SUBSTANCE: cow milking unit has teat cups, each provided with pulsator connected with suction branch pipe and rotor provided with main and auxiliary rollers, which are positioned diametrically one relative to the other. Auxiliary roller has eccentric pins on which rollers are mounted. Pulsator has variable vacuum chamber and atmospheric pressure chamber, which are separated by spring-biased piston, and damper. Variable vacuum chamber is communicated with teat cup cavity positioned below teat via branch pipe. Pulsator piston has gaged opening for communicating variable vacuum chamber with atmospheric pressure chamber and is provided with sleeve having spring-biased valve. Force applied by valve spring at maximum compression is below force applied to retain valve in closed position and generated as a function of pressure difference in teat cup cavity under teat and variable vacuum chamber of pulsator. Force applied by piston spring is maximum at the moment of complete compression of valve spring. Length of valve stem is selected such that at the moment of valve closing, piston is positioned below opening communicating pulsator chambers with teat cup interwall chamber, and at the moment of valve opening piston is positioned above mentioned opening. Pulsator damper has upper and lower chambers separated by piston provided with gaged opening and filled with viscous liquid. Pulsator pistons are interconnected by stem. Milk container has branch pipe positioned in its lower part and provided with washing liquid sprayer. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 6 cl, 6 dwg