On-line detection Method and apparatus for chain cloth performance

Abstract

This invention discloses one filter property online test method and device, which comprises the following steps: using one probe under test area and pressure to test filter transparent degree and liquid content; transparent degree test is through filter liquid flow and pressure; liquid content is to use liquid device for test through controller to convert device signal into liquid content. The test device comprises probe, spray head, liquid device with probe, pressure sensor, flow sensor, pressure adjust valve, pressure tar, controller and power, wherein, the spray head and liquid detect probe are fixed onto probe; the spray head is connected with pressure sensor and flow sensor through pressure adjust valve and pressure tar.

Description

technical field [0001] The invention relates to a method and device for detecting the performance of filter cloth, in particular to an on-line detection method and device for detecting the liquid content and liquid permeability of filter cloth in industries such as papermaking and chemical industry. Background technique [0002] Usually, the performance of filter cloth is measured by technical indicators such as air permeability, liquid permeability, smoothness, elastic properties and liquid content, among which liquid permeability and liquid content are the two main performance technical indicators. The liquid permeability of the filter cloth is an index to describe the ability of the filter cloth to remove the liquid in the filter cloth under the action of external force. The large liquid permeability indicates that the filter cloth has good liquid removal ability, and on the contrary, the small liquid permeability indicates poor liquid removal ability. ; The liquid conten...

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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