Negative pressure automatic control system for packaging box storage cabinet

Abstract

The invention relates to a negative pressure automatic control system for a packaging box storage cabinet. A control signal output end of a programmable logic controller s7-200 is connected with a control signal input end of a frequency converter; a signal output end of the frequency converter is connected with a signal input end of an induced draft fan; a pressure difference transmitter is arranged in the pump of a cement pump truck; and a data output end of the pressure difference transmitter is connected with a data input end of the programmable logic controller. The negative pressure automatic control system of the invention has a series of advantages such as reliability, stability and higher cost performance. Frequency converting control on the induced draft fan is realized, and therefore, the defects of a mechanical air door structure are well overcome, the automatic control on negative pressure in the pump is ensured reliably, and a lot of electric charge can be saved (the increased cost of the frequency converter can be recovered after the device is used for one year); and the improvement of the heat efficiency of a drying system is realized, and therefore, fuel oil consumption is effectively reduced, and the expenditure cost of fuels is reduced.

Description

technical field [0001] The invention relates to a cement pump truck control system, in particular to a negative pressure automatic control system for packing box storage cabinets. Background technique [0002] A stable negative pressure in the pump is crucial to improving the thermal efficiency of the drying system of the cement pump truck and reducing energy costs. Therefore, automatic negative pressure control should be the basic configuration of the cement pump truck. The traditional automatic negative pressure control system controls The cement pump truck has low efficiency, high air consumption, insufficient reliability, and short service life of the motor, fan and transmission part. Contents of the invention [0003] The object of the present invention is to provide a negative pressure automatic control system for a packing box storage cabinet in order to solve the above problems. [0004] The present invention achieves the above object through the following technic...

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Problems solved by technology

[0002] A stable negative pressure in the pump is crucial to improving the thermal efficiency of the drying system of the cement pump truck and reducing energy costs. Therefore, automatic negative pressure control should be the basic configuration of the cement pump truck. The traditional automatic negative pressure control system controls The cement pump truck has low efficiency, high air consumption, insufficient reliability, and short service life of motors, fans and transmission parts

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