Pill coating granulator transformation of PLC control system

1, the introduction medicine pellet coating granulator is used in laboratory or small batch production pellet granule of pharmaceutical equipment. Due to the laboratory, the original control system using a decade ago and PLC man-machine interface, so its hardware have been aging, performance degradation, often occurs in the process of running crash, black screen, restart, and even some picture parameters cannot be modified. At the same time because of no corresponding PLC programmer, programming software and man-machine interface software, so the maintainability is poor. In order to solve these problems, we adopt the Siemens S7 - 200 PLC and Beijing accused of kingview 6. The control scheme of industrial control configuration software of pellet coating granulator control system is improved. 2, pellet coating granulator system of pellet coating granulator system composition is shown in figure 1. Pellet coating granulator is specially used for laboratory or small batch production. Powder or similar material can be done in fluidized bed drying, granulating and coating process. Fluidized bed of material at the bottom of the container is equipped with screen, powder or pellet particles and similar materials were served on the screen. Moving air after filtering treatment by the container at the bottom of the screen flow upwards, when the velocity reaches a certain speed, particles ( Powder) Will be the air particles began to fluidized bed, fluidized bed. Particles in fluidized bed ( Powder) Vigorous agitation in the container, and extend to the expansion of the container area, fine powder or slight particles were adhesion on the bag filter. Control to prevent blockage of bag filter, filter bag lifting cylinder will have a batch of shaking manipulation. After the size of the bag filter, control air volume air damper and duct fan leads to outdoor atmosphere. Particles in the process, fluidized bed container can completely full contact with the air flow, and agitation, and thus be able to complete the fully dry, good good granulating, delicate coating such as pharmaceutical process. Figure 1 pellet coating granulator system composed of 3 main control requirements, system pellet coating granulator operation includes five aspects: the basic control requirements. ( 1) Product temperature control by controlling the inlet air temperature to control the temperature of the product. Inlet air temperature control accuracy for plus or minus 3 ℃, product temperature control accuracy for the plus or minus 2 ℃. ( 2) Intake air volume control precision for the control of plus or minus 40 m3 / h. ( 3) Atomization pressure control of injection pressure spray device control, control precision is plus or minus 0. 1bar。 ( 4) Sealing pressure control product containers must be seal and extension storehouse, forming a confined fluidized bed reactor. Using hydraulic device to seal, seal pressure in 35 - Between the 70 bar. ( 5) A single filter bag filter bag jitter control jitter jitter and double filter bag jitter, manual shaking bag and automatic shaking bag. 4, the choice of control scheme of 4. 1 the comparison of two different schemes pellet coating granulator improvement, there are two alternative, see table 1: on the premise of meet the control requirements, the choice of the control system hardware should pursue the best performance/cost ratio. Due to the use frequency of the machine is not high, the average once a month, at the same time, the good environment, so the PC + PLC control scheme. When machine don't have to, can make it use PC. In other words, the use of common PC can make the man-machine interface. 4. 2 PLC controller according to the requirement of the front control system hardware configuration, selection of Siemens S7 - The 200 series PLC. S7- 200 series PLC, small volume, light weight, easy installation, complete functions, flexible configuration, reliable operation, simple programming, considerable economy and stronger adaptability, can fully meet the control requirements. 4. 3 the man-machine interface configuration software and control configuration software to choose Beijing company of kingview 6. 05. This is a with ease of use, openness and integration of general configuration software. Kingview is simple to use, suitable for all kinds of simple and complex task. Only need to fill out a form of type of operation, suitable for user can generate the supervisory control and data acquisition system, can be effectively used to control the automation process, kingview 6. 05 version is running on Windows platform, so use kingview is more perfect and convenient choice. Composition of the whole control system is shown in figure 2, figure 2 5, system hardware design of the control system of Siemens S7 - is used in the control system 200 series PLC, choose the central processing unit module CPU224, digital quantity expansion module EM223, analog input modular EM231, analog output module EM232 EM235, analog input and output module. One of the central processing unit module CPU224 external wiring diagram as shown in figure 3, I/o address assignment as shown in table 2: figure 3 outer wiring diagram of PLC controller 6, system software design. 1 PLC program design of the main program block diagram as shown in figure 4, the subroutine 0 as the initialization program, subroutine to check whether the extension module normally 1, 2 for analog like mining program subroutine, subroutine 3 for sampling of each execution device output subroutine 4 for quantity of the accused and execute equipment abnormal alarm subroutine. Due to the limitation of space, each subroutine block diagram from here. Figure 4. The main program block diagram 6. 2 man-machine interface configuration and control configuration software to choose Beijing company based on Windows platform of the industrial control configuration software 'kingview' 6. 05 version. Only need for regular communication Settings and fill out a form to complete the man-machine operation interface configuration. Run configuration screen PLC program and user program, according to the pellet machine operating sequence of functions, each button click configuration screen, through the module on the corresponding output bit of light-emitting diodes (leds), observe the change of output signal whether meet the requirements of design. Configuration screen equipment, process control, process control parameters such as the picture.
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