Powder explosion-proof ultrasonic material level detection system

Abstract

The invention relates to a powder explosion-proof ultrasonic material level detection system which comprises a large cyclone recovery device; the large cyclone recovery device comprises a powder collecting cylinder; an inlet is formed in the top of the powder collecting cylinder; a powder conveying pipe is communicated with the bottom of the powder collecting cylinder; a plurality of ultrasonic detection assemblies are arranged on the powder collecting cylinder; a plurality of crushing assemblies are arranged at the bottom end of the powder collecting cylinder; an alarm assembly is arranged outside the powder collecting cylinder; a PLC control system is connected with the ultrasonic detection assemblies, the crushing assemblies and the alarm assembly; a delay controller is arranged betweenthe PLC control system and the alarm assembly. According to the system of the invention, the principle that the propagation speeds of ultrasonic waves in different media are inconsistent is utilized;the dust content in the dust collecting cylinder is accurately detected; the ultrasonic detection assemblies sends corresponding information to the PLC control system; the PLC controls the crushing assemblies, a humidity sensor and the alarm assembly to conduct corresponding operation; it is guaranteed that too much dust cannot be accumulated at the bottom of the powder collecting cylinder, the precision of the whole detection system is high, and the long-term stability of the large cyclone recovery device is improved.

Description

technical field [0001] The invention belongs to the technical field of automatic detection of dust material level, and in particular relates to a powder explosion-proof ultrasonic material level detection system. Background technique [0002] According to the requirements of the "Safety Technical Specifications for Dust Removal System Used in Dust Explosion Hazardous Locations" (AQ4273-2016), the first-stage recovery cyclone recovery system for powder spraying, the powder delivery pipeline in the barrel must be separated from the barrel structure, and the bottom adopts double layers The semi-closed structure of the pinch valve ensures the isolation of the system within any period of time and reduces the hidden dangers of fire and explosion. [0003] In this case, if the amount of powder absorbed in the front is too large, there must be some powder accumulation (storage) space at the bottom of the large cyclone equipment in the first-level recovery. The safety hazard of the ...

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Problems solved by technology

[0004] (1) The powder conveying system in the lower part of the cyclone is faulty;

[0005] (2) The quality of the powder is poor, there are lumps and lumps, and the hopper is blocked;

[0006] (3) The weather is too humid, causing the powder to stick and block at the bottom;

[0009] At present, most of the dust removal equipment on the market does not detect the bottom of the large cyclone. The main reasons are: 1. The safety awareness is weak, and the large cyclone system is not treated as a component of powder dust removal; 2. The existing detection methods are not suitable for plastic powder. There are large errors in the detection and processing of large cyclone recovery equipment, and there are a large number of false alarms. Therefore, it is urgent to design a dust level detector that can meet the requirements to meet the detection requirements of the bottom dust of large cyclone recovery equipment and ensure its long-term use. stability

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