Dry type granulator tabletting pressure control system and method

Abstract

The invention relates to dry type granulator tabletting pressure control system and method. A pressure sensor measures the real-time pressure roller pressure P1; an enabling module drives a pressure roller clearance adjusting servo motor to adjust a pressure roller clearance or drives a feeding speed control servo motor to adjust the feeding speed; a control module sets a pressure roller initial clearance S0, the initial pressure P0, the initial feeding speed V0, an allowable pressure increment upper limit as delta H, a pressure decrement lower limit as delta L, an allowable pressure maximum value as H, and a pressure lower limit value as L; a dynamic pressure different judgment module acquires a dynamic pressure difference delta P; judging the section on which the delta P is located; whenthe delta P is larger than the delta L and is smaller than the delta H, the system runs according to the current feeding speed and the current compression roller clearance; and when the delta P is larger than the delta H and is smaller than the delta L, and the time for maintaining the state exceeds the duration time t0, the pressure roller clearance adjusting servo motor adjusts the pressure roller clearance or drives the feeding speed control servo motor to adjust the feeding speed. The dry type granulator tabletting pressure control system and the method have the advantages of stability and reliability in control.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a control system for automatic adjustment of tablet pressure when powder is extruded into tablets on a dry granulator. Background technique [0002] The pressure control method of the existing dry granulator: the equipment is equipped with a hydraulic station, and the external force is applied to the pressure roller through the hydraulic machine to compress the powder into tablets. In the case of constant external pressure and pressure roller speed, the faster the feeding speed, the greater the pressure on the pressure roller; the smaller the gap, the greater the pressure on the pressure roller. [0003] This control is an open-loop control. In this control mode, with the unstable change of the amount of feed powder and external pressure, the pressure on the pressing roller is not constant, and the density of the powder after being pressed into tablets is not uniform, the consist...

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Problems solved by technology

[0003] This control is an open-loop control. In this control mode, with the unstable change of the amount of feed powder and external pressure, the pressure on the pressing roller is not constant, and the density of the powder after being pressed into tablets is not uniform, the consistency is poor, and the yield at one time is low. Low

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