Automatic dredging method and device for pneumatic convey system

Abstract

The invention discloses a method and a device for automatically removing blockages in a pneumatic conveying system. It includes pressure vessel, PLC control system and various valves, pipes and wires and sensing elements. The PLC control system judges whether the conveying pipeline is blocked according to the detected pressure change of the conveying pipeline; through the control of the PLC control system, the conveying pipeline is repeatedly inflated and pressurized, and the pressure is released to the pressure vessel, so that the material in the blocked section of the pipeline is continuously loosened Even completely loose, that is to realize the automatic dredging of pipeline blockage. The invention can automatically perform blockage judgment and blockage removal operation, has quick response, short blockage removal time, greatly improves production efficiency, avoids irregular operation of manual blockage removal, and improves equipment and personal safety reliability. The invention can be widely applied to pneumatic conveying systems.

Description

Technical field: [0001] The invention relates to an automatic blockage removal method and device for conveying materials with compressed air after blockage occurs. Background technique: [0002] In many industrial places, it is necessary to blow solid powdery or fine particle materials with compressed air. Such a system generally consists of a pressure vessel, a pipeline, corresponding valves, and a PLC (programmable logic controller) control system. During the material conveying process, due to the fluctuation of the compressed air pressure, or the wet agglomeration of the material, the impurity in the material, etc., the material often accumulates in a certain part of the pipeline, forming a section of embolism and causing the conveying pipe to be blocked. [0003] After material blockage occurs in the system, the general blockage removal method is to temporarily close the discharge valve and injection valve, let the auxiliary blow valve keep pressurizing the pipeline, and...

AI Technical Summary

Problems solved by technology

[0004] ① Can not rule out all blocking faults

The blowing aid valve keeps pressurizing the pipeline, so that the material in the plugging section is always under positive pressure. For the material with serious plugging, the plugging will become tighter and tighter, making the blockage more serious. Finally, the pipeline can only be dismantled manually

[0005] ②The operation of beating the pipe is very irregular

Such knocking will cause great damage to the pipeline, and it is easy to deform and crack the pipeline. This behavior should be prohibited in normal production.

[0006] ③Increasing hidden dangers of personal accidents

Many parts of the pipeline are installed underground or high above the ground. When the material is seriously blocked, it is very dangerous for workers to beat or disassemble the pipeline, which virtually increases the hidden danger of accidents in terms of personal safety.

[0007] ④Troubleshooting takes a long time, affecting normal production

After many times of actual use in multiple production sites, it was found that the blockage removal time is quite long. If the pipeline needs to be disassembled, the troubleshooting time will be longer, and even lead to the shortage of raw materials in the next production process.

[0008] ⑤ Manual intervention must be used to remove the blockage, and automation cannot be realized

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