Automatic dosing system for pulverized coal on molded coal production line

Abstract

The invention provides an automatic dosing system for pulverized coal on a molded coal production line. The system comprises a control part and an execution part, wherein the control part comprises a signal processing and control device connected with a coal amount detecting device, and the execution part comprises a spray gun which has a liquid inlet connected with a binder solution tank. A blowing pipe of the spray gun is connected with a gas source through an electromagnetic pulse valve, wherein a control terminal of the electromagnetic pulse valve is connected with a pulse output terminal of the signal processing and control device. The liquid inlet of the spray gun is connected with an outlet of the binder solution tank through a pneumatic or electric ball valve which is connected with the gas source through a reversing valve, wherein a control terminal of the reversing valve is connected with an output terminal of the signal processing and control device. The coal amount detecting device is an electronic belt scale or a coal seam thickness detector; the pulse output terminal of the signal processing and control device outputs the pulse with a pulse frequency of 6 to 15 time / minute and a pulse width of 0.8 to 3 second / time; and the gas source is an airbag, with the pressure of the gas source being 0.3 to 2.0 MPa.

Description

technical field [0001] The invention relates to an automatic pulverized coal liquid dosing system on a briquette coal production line, which is mainly used in the chemical industry to mix the finished binder solution (sodium humate solution) into the pulverized coal in a certain proportion in the pulverized coal liquid mixing process. In the process, it is stirred evenly by a double-shaft mixer and sent to the next process. The uniformity and stability of pulverized coal dosing amount are guaranteed by automatic control, so as to achieve the purpose of stabilizing product quality and saving labor resources. Background technique [0002] At present, most of the pulverized coal liquid mixing sections in the chemical briquette industry are manually proportioned. By manually operating large-diameter ball valves, adjusting the opening of the ball valve and the switching frequency of the ball valve, the binder solution is proportioned according to a certain ratio. [0003] The bi...

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Problems solved by technology

[0006] 1. This dosing method needs to manually move the ball valve repeatedly for operation. If the ball valve is not moved for a long time, the binder solution will easily stick to the ball valve, resulting in a gradual decrease in the dosing volume and failing to meet the required dosing ratio. , so the labor intensity of the workers in this liquid preparation method is high

[0007] 2. The dosing ratio is based on the workers' personal awareness and experience. The dosing ratio is seriously affected by personal factors and the quality is unstable;

[0008] 3. Due to the manual operation of dosing, the entire dosing production line requires a lot of labor, production management is difficult, and it is difficult to realize automated production

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