Reactor Weighing system is often used in petrochemical, rubber, pesticides, dyes, medicine and other industries, is used to complete sulfonation, nitration, hydrogenation, alkylation, polymerization, condensation and many other processes of organic dyes and intermediates reaction equipment. It is mainly composed of touch screen, weighing instrument, industrial computer and automatic pneumatic valve, conveying pump, mixing tank and weighing control system. Through the automatic control program of the touch screen of the weighing instrument, various raw materials can be automatically mixed in different order and temperature, and the ideal automatic liquid dispensing equipment for finished product manufacturing can be realized.

The reactor starts the weighing system and sets the weight required for this liquid injection. The weighing instrument automatically collects the weight signal of the reactor and sets the injection amount required for this liquid allocation on the human-machine interface. The programmable controller will automatically add liquid and make judgment according to the set value. When the weight collected by the weighing module reaches the set weight, the weighing instrument system will automatically close the filling valve. The dry material is fed by vibrating disc, the powder material is fed by spiral Feeder, the liquid material is fed by hydraulic valve and the paste is fed by pump. Each of the ingredients has the use of coarse material and fine material two feeding methods to ensure that the weighing accuracy reaches 98% to 99%. The weight of the material is converted into an electrical signal by A weighing instrument mounted on the support frame and A weighing reactor, which is converted by A/D and read into the computer for weight calculation. After the tare is removed, the result is compared with the set value, and the result is used as the basis for controlling material switching or coarse and fine feed conversion. The weighed mixture is discharged through the valve to the heated reaction tank, stirred, and then pumped into the dissolver to enter the sugar dissolving process.

The batching application software is developed jointly with PC and adopts the combination programming, modularization and structure design method of assembly language and BASIC language. The whole program is composed of batching diagnosis module, A/D and data processing module, alarm module, button, display, printing module and so on. Each module is relatively independent and complementary, so that sampling, calculation, control, display, parameter setting and other orderly, urgent and orderly operation. In terms of weighing accuracy, key response speed, fault alarm ability, the requirements of automatic metering feed have been reached. Among them, the diagnostic subroutine includes CPU instruction system diagnosis, RAM diagnosis, EPROM diagnosis, A/D, I/O template diagnosis and sensor signal detection in order to achieve the fault alarm function of the battering system.

The automatic dosing subroutine compares the weight increment Δg in the interval Δt of two samples with the difference e between the set value and the weighing value. According to the comparison result, the coarse material, fine material and refuelling are switched to improve the weighing accuracy. Using one unit to count the order of the ingredients, so that the ingredients can share the same program, in order to optimize the program structure and save the program memory space.

The CPU processes keystroke requests in an interrupt manner. In the keyboard interrupt service subroutine, the key is identified and the corresponding bit flag variable is set. The other function modules control the program direction according to the state of the flag variable.