Patent GB-809854-A (GB)
Title: An improved milking installation
IPC: B08B9/02
Filed: 1955-06-10
Abstract: 809,854. Cleaning pipes. ECREMEUSES MELOTTE S.A. June 10, 1955, [June 10, 1954], No. 16793/55. Class 99(2). [Also in Groups XXIII and XXIX] Relates to a milking installation having means for washing the milk-contacted parts by causing washing solution to flow in one direction through the parts under the influence of a vacuum and is characterised by a vacuum control device insertable in the connecting means between the installation and the vacuum source during a washing operation so that the installation is maintained full of washing solution and the latter is prevented from entering the vacuum source, the device comprising a chamber provided with a valve on a vertical rod having a pair of spaced abutments and a float slidable on the rod between the abutments so that the valve breaks the vacuum when the chamber is substantially full of washing solution and closes when the chamber is substantially empty. Washing solution in a reservoir 34, Fig. 2, is drawn-up through milking apparatus 37 connected by hoses 36 to nipples 33a on a manifold 33 secured to one end of the milk pipe line 12 and passing into a milk-receiving container 14, the latter being connected to a pipe 16 communicating with the source of vacuum through a liquid trap 15. The bottom of the container 14 is connected through a pump 17 and delivery pipe 19 to a swivel pipe 22 positioned to return the washing solution to the reservoir 34. The pump 17 is driven continuously by a motor 18 when a switch 25 is in the full line position and the delivery of the solution is throttled by a valve 40 so that the container 14 is filled more quickly from the pipe line 12 then it is emptied by the pump. Consequently the solution completely fills the container 14 and enters the pipe 16. The solution is prevented from passing to the vacuum source by the by-pass vacuum control device shown in Fig. 4. A valve 30 in the pipe 16 is closed during the washing operation and the washing solution entering the pipe 16 passes into a chamber 31 through a connection 42. The chamber is connected by pipe sections 43, 44 and a hose 32 to a connection 16a in the vacuum pipe 16 beyond the closed valve 30. The pipe section 44 is closed by a valve member 45 on a rod 46, urged by a spring 50 in a valve opening direction, and having two abutment collars 48, 49 between which is slidable the float 47. In the position shown in Fig. 4 the chamber 31 is empty and the weight float 47 has overcome the spring 50 to lower the rod 46 and thus close the valve 45 on the pipe section 44, whereafter the valve is maintained closed by the vacuum prevailing in the chamber. As washing solution enters the chamber 31 the float 47 rises until it abuts the collar 48 and snaps open the valve 45 to break the vacuum. When the float again falls and abuts the collar 49 the valve 45 recloses. By this means the pipe line 12 container 14 and pump and pipes 19, 22 are retained full of washing solution. When the installation is to be used for milking, the manifold 33 is removed and the end of the pipe line 12 is sealed by a cap (not shown) ; milking apparatus is connected to the cocks 13 ; the by-pass 31, 32, is removed and the connections 42, 16a are sealed off by caps 42a, 16b ; the valve 30 is opened ; the swivel pipe 22 is connected to a milk holding tank 20 ; and the motor switch 25 is moved to the position shown in dotted line in Fig. 2. Electrodes 23, 24 within the milk container 14 are interconnected with the switch 25 through a control unit 26 such that when milk reaches the level of the electrode 23 the motor 18 is started to operate the pump 17. When the milk drops below the electrode 24 the control 26 causes the motor to stop. By this means milk is prevented from passing to the vacuum source.