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Multi-point correction method for Fisher particle size analyzer

A Fibonacci particle size and multi-point correction technology, which is applied in the detection and analysis of powder metallurgy, metal powder and hard alloy materials, can solve the problems of equipment air pressure changes, influence detection systems, changes, etc., to achieve consistent detection systems and solve problems The effect of systematic differences

Pending Publication Date: 2022-02-08
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different brands of instruments have certain system differences, which is not conducive to the stable control of production quality
On the other hand, as the Fischer particle size analyzer is used for a long time, the resistance of the instrument to the gas changes, resulting in changes in the air pressure of the equipment, which in turn affects the changes in the detection system.
The single-point calibration of the ruby ​​standard tube disclosed in the previous technical information cannot be used to eliminate system differences between instruments and system differences caused by equipment aging, which brings inconvenience to production and testing technology control

Method used

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  • Multi-point correction method for Fisher particle size analyzer
  • Multi-point correction method for Fisher particle size analyzer
  • Multi-point correction method for Fisher particle size analyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The WLP-208 Fisher Particle Size Analyzer was calibrated with the Fisher 95 Particle Size Analyzer as the debugging standard. The working principle diagram of the Fischer particle size analyzer in this embodiment is as follows figure 1 As shown, it includes a pressure stabilizing valve 1, a sample tube 2, a needle valve behind the tube 3, a reading plate baseline 4, a U-shaped tube 5, a water replenishing valve 6 and a stabilizing tube 7. The specific calibration method is: adjust the equipment to the low gear position, weigh 15.7g of calibration substance WC-A (0.5um) and calibration substance WC-B (10.0um), put them into the sample tube, press them into the porous brass sieve, and placed on the support column. Move the rack until the bottom surface of the rack is in contact with the brass screen in the sample tube, turn the handwheel, and apply 222N pressure repeatedly 3 times. Read the Fischer particle size value of WC-A at 0.500 porosity, and read the Fischer part...

Embodiment 2

[0037]Calibrate the WLP-208 Fischer particle size analyzer with the standard value of the ruby ​​standard tube as the calibration reference. The specific calibration method is as follows: adjust the equipment to a low gear, and select ruby ​​standard tube 1 (2.30um) and ruby ​​standard tube 2 (1.85um) for calibration. Read the Fischer particle size value of ruby ​​standard tube 1 (2.30um) at 0.700 porosity, and read the Fischer particle size value of ruby ​​standard tube 2 (1.85um) at 0.750 porosity. Calculate the L value according to formula 2, then calculate the water column height of ruby ​​standard tube 1 (2.30um) and ruby ​​standard tube 2 (1.85um) according to formula 3, and calculate the K value of the WLP-208 Fischer particle size analyzer. Debug the low-grade needle valve so that K 测量 with K 标准 unanimous. Then adjust the water level of the voltage regulator tube so that the difference between the Fischer value and the standard value of the ruby ​​standard tube 1 (2...

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Abstract

The invention discloses a multi-point correction method for a Fisher particle size analyzer. The method comprises the following steps of: measuring the height of a water column by using two or more high and low standard substances, adjusting a C value of an instrument needle valve to enable the ratio K of F values of two standard samples to reach a preset standard value, and enabling the water column heights of the two standard samples to reach a preset standard value by adjusting the water level height P value of the pressure stabilizing pipe, so that correction of the detection equipment is completed. The main technical point of the method is to consider the air pressure loss of instruments, that is, the pre-tube pressure of each instrument is different, and the instrument constant is adjusted by combining a needle valve, so that the purpose of adjusting the instrument system is finally achieved.

Description

technical field [0001] The invention relates to a multi-point correction method for a Fischer particle size analyzer, which belongs to the technical field of powder metallurgy, detection and analysis of metal powder and hard alloy materials. Background technique [0002] The Fischer method is based on measuring the speed of air passing through the powder accumulation, and calculating the average particle size of the powder according to the Kozeny-Carman formula. Fischer particle size analyzer is a measuring instrument designed according to this principle. It has the advantages of simple structure, convenient operation and low cost. It is widely used in metallurgical powder process and product quality control, and has important production guidance significance. [0003] Calibration of instruments and equipment is a necessary condition for ensuring the accuracy and stability of the results. According to the existing public technology, the Fischer particle size analyzer general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
CPCG01N15/02G01N2015/0277
Inventor 龙本夫王玥林小璇林高安杨会珍陈林栋周喜诚柴曌媛
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY
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