| 摘要 |
The invention relates to agriculture, in particular to machine milking of cows. An electromagnetic pulsator of pairwise action comprises an axially symmetrical body, which in each half has openings for connecting with a vacuum duct and atmosphere, an upper cover and a lower one, a working chamber, a control one and that of constant vacuum-gauge pressure, an electromagnet with a valve anchor, rubber liners. Each of the valve anchors is made as a solid metal cylinder with longitudinal cuts and with cylindrical rubber valves press-fitted at the ends. One valve anchor is alternatively allowed to overlap an opening connecting the control chamber with atmosphere, and the other to overlap a calibrated opening connecting the chamber of constant vacuum-gauge pressure with the control chamber. The liner between the upper cover and the body is made of rubber of the same thickness in all cross-sections thereof and arranged in such a manner that it functions simultaneously as a membrane. In doing so the working, control chambers and that of constant vacuum-gauge pressure are arranged coaxially. In the membrane a rod made in such a manner as to allow axial movement is fixed by the upper end and connected with two valves which alternatively overlap an opening between the chamber of constant vacuum-gauge pressure and the working chamber and air access through the opening for connecting the latter with atmosphere. |
