On-line detection Method and apparatus for chain cloth performance

A detection method and detection device technology, which are applied in measurement devices, instruments, analysis of suspensions and porous materials, etc., can solve the problem of inability to quantitatively detect the liquid content of filter cloth, the air permeability of filter cloth cannot be quantitatively determined, and the air permeability is difficult to determine and correct. Value and other issues, to achieve the effect of clear test results, strong production guidance and light weight

Inactive Publication Date: 2007-09-26
ZHEJIANG HUAZHANG TECH
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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.

Method used

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  • On-line detection Method and apparatus for chain cloth performance
  • On-line detection Method and apparatus for chain cloth performance
  • On-line detection Method and apparatus for chain cloth performance

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Embodiment 1

[0024] The liquid meter of the detection device in this embodiment is an infrared liquid meter, and the liquid content detection method adopts an infrared detection method. Referring to FIG. 1 , the liquid meter of the detection device mainly includes an infrared liquid meter including an infrared light source 9 and an optical filter 8 , and an infrared liquid detection head 13 is selected as a liquid detection head. The nozzle 1 and the infrared liquid detection head 13 are installed in the probe 2 . The filter wavelength of the embodiment optical filter 8 is 1.4-1.9 microns; A certain amount of liquid and compressed air are housed in the pressure tank 6, and the pressure gauge 7 showing the compressed air pressure is installed on the pressure tank 6; Pressure valve 5; Power supply selects portable power supply 11 for use. After the nozzle 1 is connected to the pressure sensor 3 and the flow sensor 4, it is connected to the pressure tank 6 through the manual pressure regulat...

Embodiment 2

[0037] The liquid meter of the detection device in this embodiment is a resistive liquid meter, and the liquid content detection method adopts a resistance detection method.

[0038] As the liquid content of a substance changes, its electrical resistance changes accordingly. For example, when the liquid content of wheat is 13%, the resistance value is 7 times that when the liquid content is 14%, and is 50 times that when the liquid content is 15%. A small change in the liquid content of the substance can cause a significant difference in the resistance value of the substance, which is the principle of the resistance method to determine the liquid content of the substance. The resistance method to measure the liquid content is to detect the resistance value of the filter cloth and then convert it into liquid content. This liquid content detection method has the advantages of fast and simple.

[0039] Referring to Fig. 2 and Fig. 3, the liquid meter of the detection device is a...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N15/08G01N27/12G01N21/17
Inventor 胡杭滨程剑冰唐志超钟天平余真德毛怡红
Owner ZHEJIANG HUAZHANG TECH
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