Servo Closed-loop Control System of Plate Laminated Plug Oil Cylinder in Freeze Dryer

Abstract

The invention discloses a servo closed loop control system for a pressure-plunger oil cylinder of a freeze dryer slab. The servo closed loop control system comprises a control assembly, a servo proportioning valve, a servo proportioning valve controller and a position detection assembly installed on the servo proportioning valve. The control assembly outputs given opening degree signals and transmits the given opening degree signals to the servo proportioning valve controller; the position detection assembly detects actual opening degree signals of the servo proportioning valve and feeds the actual opening degree signals back to the servo proportioning valve controller; and the servo proportioning valve controller outputs control instruction to control the opening degree of the servo proportioning valve in dependence on the given opening degree signals and the actual opening degree signals. The servo closed loop control system is advantaged by simple structure, high control precision, fast response speed and adjustable pressure of a pressure-plunger.

Description

technical field [0001] The invention mainly relates to the field of packaging machinery for medicine, food, etc., in particular to a servo closed-loop control system for a plate lamination plug cylinder of a freeze dryer. Background technique [0002] Freeze dryer is a kind of equipment that uses the principle of sublimation to dry. It is mainly used to freeze-dry sterile products filled in half-pressed cecillin bottles with water as the solvent, and complete the cillin of the feeding liquid before discharging. Full cork of the bottle. With the improvement of pharmaceutical companies' requirements for the sterility assurance and automation of drugs, and the implementation of the new version of GMP in 2010, the in and out of the freeze dryer adopts a fully automatic in and out system, which requires a freeze dryer plate that can be positioned automatically The layer is matched with the automatic feeding and discharging system to ensure the sterility, repeatability and verifi...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned control device suffers from poor ply positioning control accuracy, and the deviation of ply positioning is usually about 2.5 mm.

When the deviation of the board layer positioning is greater than 2.5 mm, it will cause the bottle to fall when feeding and discharging; because the hydraulic pressure cannot be adjusted, the hydraulic solenoid valve will have a hydraulic shock at the moment of opening and closing, which will cause oil leakage from the oil cylinder after long-term use And the problem of oil cylinder sliding; when fully pressing the plug, the pressure cannot be controlled. If the pressure is too high, the medicine bottle will be broken, and if the pressure is too small, the medicine bottle rubber stopper will be stuck on the ply.

Images