I. Introduction:

Today, beverage filling machines are widely classified into two types according to their scale. One is a large-scale filling production line. This production line is suitable for large-scale enterprises, with large investment, high degree of automation, and complicated control system. The class is a small-scale single-machine beverage filling machine. This single-machine system is suitable for small enterprises, with small investment, relatively low automation, and simple control system. This paper introduces the design of the single-chip system of beverage filling machine in combination with the development of a beverage filling machine automatic control system.

Second, the working diagram of the filling machine and the requirements for the control system:

The working diagram of the filling machine system is shown in Figure 1. The functional requirement is that it can fill 11 kinds of bottled beverages of 50 ml, 80 ml, 100 ml, 120 ml, 150 ml, 180 ml, 200 ml, 250 ml, 300 ml, 350 ml, 500 ml, and should be able to be produced according to the production. The actual situation of online modification of product specifications and corresponding delay time, online display of daily output, monthly output, total output. The control flow is as follows: the solenoid valves 1, 2 are energized, and the control levers 1 and 2 are extended. After a delay of 0.5 seconds, the solenoid valve 2 is de-energized, so that the bar 2 is retracted, and the empty beverage bottle is transported and counted by the conveyor belt. After counting 8 times, the lever 2 is extended. After a delay of 0.2-2 seconds, the solenoid valve 4 is electrically controlled to control a row of 8 nozzles to move down, then delay for a period of time (this time is adjustable), and the solenoid valve 3 is energized. Control the movement of the piston, start filling according to the capacity set at the beginning, and judge whether the piston reaches the specified position through the infrared photoelectric switch, that is, whether the beverage bottle is filled, after the delay of 0.1-0.20 seconds, the solenoid valve 3 loses electricity under the piston. After the container is refilled with the beverage, after a delay of 0.1-0.25 seconds, the solenoid valve 4 is de-energized, a row of nozzles is moved up, and then the solenoid valve 1 is de-energized to control the lever 1 to be retracted, and the bottle filled with the beverage is transported through the conveyor belt. And start counting, after counting 8 full, and then return. In addition to controlling the above-mentioned mechanical motion, the control system should have a liquid crystal display function to display various parameters and states, and the capacity, delay time, and clock can be set.

Third, the composition of the control system:

1, the principle block diagram

This system uses PHILIPS89C51 microcontroller. The principle block diagram of the control circuit with the single chip as the core is shown in Fig. 2. For simplicity, the interface addressing of the system uses line-selected slice addressing.

2. Introduction to the interface between the MCU and each module

(1). Interface with OCM4*8C liquid crystal display module

OCM4*8C liquid crystal display module is a 128*64 dot matrix Chinese character graphic liquid crystal display module, which can display Chinese characters and graphics, with 8192 Chinese characters (16*16 dot matrix) and 128 characters (8*16 dot matrix). 64*256 dot matrix display RAM (GDRAM). It can interface directly with the CPU and provides two interfaces to connect to the microprocessor: 8-bit parallel and serial connection. The system adopts 8-bit parallel connection mode, its interface is shown in Figure 3. RS, R/W, E are OCM4*8C data/command control bits, read/write control bits and enable control, respectively. PSB is parallel and serial. Transmission control, LEDA, LEDK for backlight power supply positive and negative with P2.4 port to control the backlight off.

(2). Interface with clock chip SD2000C

The SD2000C is a high-precision real-time clock chip with a built-in crystal oscillator and an IIC bus interface. Built-in disposable rechargeable battery, available for 5-10 years.

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