Sampling methods and working conditions, to study the factors that affect the accuracy of the sampling results

Material sampling equipment material detection system is the key equipment , which directly determines the accuracy of the sampling material test results are correct. Material sampling equipment varied, its sampling theory, sampling method, applications are also different . Therefore, according to the working principle of sampling equipment , sampling methods and working conditions, to study the factors that affect the accuracy of the sampling results , to ensure sampling distortion, it is particularly important. In this paper my school developed material  High pressure ball valve  system sampling device for the study, described in detail the working principle of this device and the working process , and according to its working principle and the field conditions of its structure , a detailed  Valve manifolds of the work process research to identify the key factors affecting the sampling results - system external load , its theoretical calculations and  Instrument manifold  verification, and proposed to reduce the system load impacts outside the program , developed during sampling of the best operating parameters , making the device the more reliable performance improvement. First, the author analyzes the sampling device work site conditions and requirements , introduced the device 's basic structure and working principle , that the only car in reclaiming the case of uniform operation to ensure sampling results are not distorted.

Valve controlled protection system with high reliability and long-running sexual

Axial fan to blast valve as research object, the check valve controlled protection system , aimed at the check valve itself does not affect the work of the case , in the blast when the normal flow of ventilation ducts , improve valve valves, reducing valve head loss , improve blast furnace steel production . Valve controlled  2 way manifold  parts protection system using electromagnets and three-phase AC motor as the driving force to enhance the valves, electric control part adopts PLC as the main control device to control the movement of the mechanical structure ;  Instrument manifold  ​​redundant monitoring module , to improve the system reliability ; prepared using the graphical programming software remote monitoring program to facilitate the operator to operate the control system and view historical data ; serial communication and the use of CAN bus technology to connect PLC  Instrument valve manifold , redundant monitoring module and a remote monitoring system. Valve controlled protection system with high reliability and long-running nature , and has expansion capability. The greatest feature of this system is the mechanical moving parts with our own security, which can be electrically controlled in the case of partial failure of the check valve can still ensure the work ; Meanwhile , PLC and redundant monitoring module via two communication systems simultaneously, improving reliability ; preparation RMON program good user interface , making the system easier for the operator to accept.