CH359979A - Servo motor for operating two machine parts - Google Patents

Description

  

  Servo motor for actuating two machine parts Servo motors for actuating machine parts generally consist of a cylinder in which a pressurized, preferably double-acting piston is movably arranged in wel chem. In such cases, the piston rod is connected to the machine part to be operated. Such servos are z. B. used for loading the inlet and outlet valves of the locks of pressure chambers. Such locks are used, for example, in vacuum dryers to smuggle grain into the negative pressure treatment room and to discharge it again.

   In this case, the servo device for the inlet valve has been arranged outside the lock and the servo device for the outlet valve leading into the pressure chamber has been arranged inside the lock.



  The disadvantage here is that any leaks occurring in the servo device located within the lock disturb the pressure conditions in the lock, especially in the case of a vacuum. Another disadvantage is that the monitoring of the functioning of the servo device is made very difficult because it is arranged in an airtight container. Repairs to the facility also require a time-consuming removal from the lock.



  According to the invention, the disadvantages mentioned are avoided by a servomotor, the two coaxially one behind the other pressure medium. has cylinder with piston, one rod of which passes through the other.



  With this design, two servomotors for actuating a machine part are structurally united without the independence of the functions of both being impaired. In the case of the aforementioned application example of the servomotors for actuating the inlet and outlet valves of the locks of pressure chambers, there is the particular advantage that the pressure conditions in the lock no longer exist due to the omission of the scrvomotors for operating the outlet valve be disturbed.



  The invention is explained in more detail below using an exemplary embodiment shown in the drawing: The servomotor consists of two coaxially one behind the other pressure cylinders 1, 2, their adjacent end walls in a particularly advantageous manner are combined to form a common end wall <B> 3 </B>, while the cylinders are closed to the outside by the end walls 4, <B> 5 </B>.

   The cylinders <B> become through the tensioning screws <B> 6, </B>, which are passed through the end walls 4, <B> 5 </B> and are screwed into the common end wall <B> 3 </B> 1, 2 connected pressure-tight to form a structural unit. In each of the cylinder chambers <B> 8, 9 </B> there is a double-acting piston <B> 10, 11; </B> which can be pushed into these chambers <B> 10, 11 </B>; B> 14 connected, of which one, <B> 13, </B> is passed through the other, 14, longitudinally movable.

   The ends of the piston rods <B> 13, </B> 14 are provided with a thread <B> 15 </B> for connection to the machine parts to be operated, for example for the valves of the locks of pressure chambers. With <B> 16 </B> and <B> 17 </B> pressure medium supply and discharge lines are designated for each <B> cylinder </B> cylinder space <B> 8, 9 </B>.



  Each of the pistons <B> 10, 11 </B> <U> can </U> be actuated when pressure medium is supplied, independently of the position of the other.

 

Claims (1)

<B> PATENT CLAIMS </B> L, servomotor for actuating two machine parts, characterized by two coaxially arranged pressure cylinders with pistons, one rod of which goes through the other. II. Use of the servo motor according to claim I for actuating the valves of pressure chamber locks. SUBSTITUTE SHEET Servo motor according to patent claim <B> 1 </B> characterized by a common wall of the two cylinders lying one behind the other.