Automatic control system of seedless metering for balanced sugarcane pressing

Abstract

The invention discloses a nuclear-free metering automatic control system for balanced sugarcane feeding squeezing. With an optical wave measurement technology, the sugarcane feeding squeezing amount can be measured and controlled based on combination with the PLC and computer control technology. The system is composed of a laser ranging module, an electric control module, a PLC control module and a man-machine interface monitoring module and is based on a novel application technology using the optical wave measurement technology to replace a nuclear source so as to realize squeezing conveying metering. Compared with the nuclear source technology, the application cost is reduced, the operation becomes simple and convenient, nuclear leakage and loss can be avoided; management measures including nuclear supervision and nuclear waste recovery and the like can be effectively reduced, and the internal management of the enterprise can be optimized. The nuclear-free sugarcane feeding, squeezing, and conveying measurement technology having characteristics of high intelligent level, environment protection, and high efficiency can replace the nuclear source metering system that is employed by the sugar refinery currently comprehensively and thus has the broad market prospects.

Description

technical field [0001] The invention relates to the technical field of industrial process control, in particular to a seedless metering automatic control system for balanced feeding of sugarcane. Background technique [0002] Pressing is the first process of sugar production. Whether it is normal or not directly affects the production status of subsequent sections. If its production is not normal, it will affect the normal production of the whole plant, product quality, power, steam stability, and energy consumption. and production safety are seriously affected. However, due to the extremely complicated control relationship in the pressing workshop, various production parameters are interlocking and closely related, and it is a very complicated project. [0003] The key process requirements for sugarcane crushing are: not only to ensure that the entire crushing process is carried out safely, efficiently, and smoothly, but also to minimize the frequency of speed regulation o...

AI Technical Summary

Problems solved by technology

[0005] 1. The control scheme and its defects measured by nuclear scales: According to the weight of sugarcane shreds to be squeezed by nuclear scales, the speed of the conveyor and the amount of permeated water added are controlled. This is the control scheme adopted by most sugar factories in China at present. Its main flaws are:

[0007] The nuclear radioactive sources used in nuclear scales are more or less harmful to the human body. During use, they not only directly endanger the health of operators and maintenance workers, but also have harmful effects on consumers who eat sugar products made of sugarcane shreds that have been exposed to nuclear radiation. Hazards, many countries including Thailand in Southeast Asia prohibit the use of nuclear scales in sugar factories

[0008] (2) The conversion is complicated and the error is large

[0031] We know that each measurement parameter will have an error, and the mass absorption coefficient of the material is also different due to the difference in sugarcane origin, variety, and batch. The above calculation involves nearly 10 measured values ​​and 1 mass absorption coefficient. There are so many error factors. The error will be even greater when superimposed. Therefore, the method of indirectly calculating the weight of sugarcane shreds to be squeezed through the measurement of nuclear scales is complex and inaccurate, which will inevitably affect the control accuracy of smooth pressing and the amount of permeated water added, resulting in unsatisfactory smooth pressing effect. Partial extraction rate decreases and subsequent heat of evaporation increases

[0032] (3) The installation, maintenance and repair of nuclear scales are troublesome

[0037] (1) Since the cane falling is uneven from the beginning, if the speed of each cane conveyor belt is synchronized, it will be difficult to ensure the uniformity of the sugarcane shreds on the last stage of the cane conveyor belt. Therefore, the control is too rough and the effect is not ideal

[0038] (2) Since there is no measurement of the incoming sugarcane shreds, there is no reference basis for the control of the amount of permeated water added, and it is impossible to accurately control it at all.

[0042] The above-mentioned technical solution adopts a contact measurement method, which not only has poor accuracy, but also is prone to failure, resulting in errors in measurement results.

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