On-line detection Method and apparatus for chain cloth performance

Abstract

The invention discloses an online detection method and device for filter cloth performance. The detection method uses a probe to simultaneously detect the liquid permeability and liquid content of the filter cloth under a certain detection area and pressure. The liquid permeability is to measure the flow and pressure of the liquid passing through the filter cloth; the liquid content is detected by a liquid meter, and the electrical signal detected by the liquid meter is converted into liquid content by the controller. The detection device mainly includes a probe, a nozzle, a liquid meter with a liquid detection head, a pressure sensor, a flow sensor, a pressure regulating valve, a pressure tank, a controller and a power supply. The nozzle and the liquid detection head are installed in the probe, and the nozzle is connected to the pressure sensor. After the flow sensor is connected to the pressure tank through the pressure regulating valve, the liquid detection head is connected to the liquid meter. The invention overcomes the defects of the prior art, has the advantages of convenient detection, stable performance and high precision; simultaneously quantitatively detects the liquid permeability and liquid content, and has the advantages of strong pertinence, practicability and guidance.

Description

Technical field [0001] The invention relates to a method and device for detecting the performance of filter cloth, in particular to an online method and device for detecting the liquid content and liquid permeability of the filter cloth in papermaking, chemical industry and other industries. Background technique [0002] Technical indicators such as air permeability, liquid permeability, flatness, elasticity and liquid content are usually used to measure the performance of filter cloth. Among them, liquid permeability and liquid content are the two main performance technical indicators. The liquid permeability of the filter cloth is an index that describes the ability of the filter cloth to remove the liquid in the filter cloth under the action of external force. A large liquid permeability indicates a good liquid removal ability of the filter cloth. On the contrary, a small liquid permeability indicates a poor liquid removal ability. ; The liquid content of the filter cloth repr...

AI Technical Summary

Problems solved by technology

However, these two detection methods have the following limitations: 1. There are uncertain factors in the detection. The liquid content of the filter cloth is related to the pressure of the air. When the liquid content in the filter cloth is high, the liquid in the filter cloth will compress the air. When a certain resistance is generated, the air permeability will decrease; when the liquid content in the filter cloth is low, the air permeability will increase, and the air permeability of the filter cloth will change with the liquid content in the filter cloth.

Moreover, the influence of the liquid content in the filter cloth on the air permeability cannot be quantitatively determined, and it is difficult to determine the correction value for the air permeability detection, which leads to errors in the detection

2. The positive pressure detection method can only detect the change trend of the liquid content, but only relatively judge the level of the liquid content, and cannot quantitatively detect the liquid content of the filter cloth

Therefore, these two detection methods are used in the production site to guide the operators to judge and determine the time and frequency of replacing the filter cloth, which is not pertinent and instructive enough.

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