Construction and Ergonomics of Shuttering and Remediation Guidelines for Rotary Air Compressors
At present, the standard absolute value judgment standard absolute value judgment standard is used to compare the measured data or statistics directly with the standard threshold to judge the state of the equipment. Most of the absolute value standards are international standards, national standards and industry standards. But in general, the wider the scope of application of the standard, the more conservative its standard value, the worse its RMS value. When using the absolute value judgment standard, it is necessary to grasp the scope of application of the standard and the measurement method, otherwise there will be a large error or even an error. Most experts and experienced diagnostics believe that the breadth of the absolute value standard determines that it does not apply to all similar equipment, but only as a reference for state determination. The relative value judgment standard relative standard is the initial value of the measured value of the normal state, and the current measured data value reaches the threshold value of the initial value as the threshold value to determine the current state of the device, which is the same device, in the same part (the same measurement Point, same direction and the same working condition) A method of judging whether the vibration of the device is measured by periodically measuring the vibration value and comparing it with the vibration value of the normal operation. The determination of the initial value in the relative standard is extremely important. Generally, at least 6 valid data are taken for averaging and then used as the initial value, the relative judgment standard of ISO. The analogy standard for analogy is to measure the same part under the same conditions for a device with the same model and the same specifications, and compare the measured values ​​to determine whether an abnormality has occurred in a certain device. For a number of equipments of the same specification type and the same operating condition, the state standard can be used for the lack of necessary standards, and the analogy criteria can be found. Analogy criteria project Low-frequency mechanical (<1000Hz) high-frequency mechanical (>1000Hz) anomaly zone>1x>2x reciprocating mechanical fault vibration diagnostic criteria establishment and perfection of diagnostic criteria library is based on the operation of similar equipment A good device compares and evaluates the status of other devices. In actual work, there may be multiple similar devices, and their operating conditions are different. Therefore, the size of each indicator should be compared first, and the best one should be selected as the reference standard for this diagnosis, so that other devices can The standard library is compared to give a more accurate status diagnosis. It needs to be clear that the standard is based on the same type of equipment operating under the same conditions, otherwise the established standard is meaningless. Establishment of automatic optimization criteria In the actual monitoring process of the Tarim Oilfield, the laboratory will encounter the following problems when the standard library is established according to the established diagnostic criteria established by the diagnostic system: (1) The single equipment after the overhaul is not necessarily It is suitable for standard; (2) The state index of the whole machine is excellent, but the individual components are faulty, and the fault information is diluted in the whole machine state; (3) The actual single-stage equipment as the standard often cannot strictly reflect the excellentness of such equipment. status information. Therefore, the standard creation method of the diagnostic system has been modified, and the principle of virtual standard machine for automatic optimization has been proposed. The principle of automatic optimization is based on the specific equipment. When several similar equipments need to be tested, it is generally based on the machine with better machine condition or overhaul for a period of time as a reference standard library for other machines. Each part of the machine will be considered a standard component that works well, which often masks individual component failure information for some good machines. The automatic optimization virtual machine is based on the same type of components of all devices of the same type, extracts the excellent components of all machines, and weights them with the importance coefficient set by each, and finally forms a good virtual machine as a standard library, all needs The same type of equipment is tested for status grading and fault diagnosis based on this virtual machine. Extension of automatic optimization method (1) Weighting principle for state grading When diagnosing fault information of individual components, the advantages of the automatic optimization method of virtual components constituting the optimal components are fully reflected, but in the state grading According to the previous state classification principle, it is often the case that the average state level of the machine is too different from the virtual machine composed of the optimal components, and most of them are classified as poorly-performing devices, which is inconsistent with the actual situation. The rationalization of the state grading results uses the method of automatic optimization and automatic average phase weighting to establish the criteria for state grading. That is, the optimal standards and average standards of similar components of all similar machines are weighted, and the weighted virtual components are then combined into a virtual machine as a standard library for state classification. (2) Longitudinal expansion of automatic grading If the state monitoring work is carried out as a long-term auxiliary work of equipment management, the automatic optimization method can be extended vertically, that is, the component information of the same type of equipment in different periods is automatically optimized. The sample is more conducive to the dynamics and extensibility of the standard establishment, and it plays a positive role in the prediction of the operation status of the single incomparable equipment and the fault diagnosis. Application examples The following is the diagnosis of the same gas injection machine in a certain operation area of ​​the Tarim Oilfield. The system divides the performance status of the device into five states: excellent, good, medium, poor, and poor. The letters represent the overall status evaluation and the numbers represent the extent to which the unit being diagnosed differs from the standard value. Department of Precision Diagnosis Comprehensive Report Diagnostic Library: Yaha District No.: Gas Injection Machine 4 Time: June 27, 2004 Standard Library Department: Yaha District No.: Gas Injection Machine 4 Time: July 7, 2003 1 Diagnosis Parameter report (average, maximum unit is (acceleration m/s2), the remaining units are (acceleration m/s2)/1000) (1) absolute value 370263-288% (2) axis vibration value 414984813-884% (3 )Axis centering vibration value 206,914,488-783% (4) Sliding bearing vibration value 588,874,725-920%2 Possible faults Simple diagnosis results The tooth chamber 4 crankshaft input end radial sliding bearing friction-induced sliding, 597% teeth The frictional induced sliding of the crankshaft free end radial sliding bearing of the crankshaft of the Ha District 4, the 570% of the toothed machine 4 crankshaft input end of the radial shaft misalignment, 570% precision diagnosis results of the tooth chamber 4 3 Cylinder crosshead gap is large, loose, 950%3 machine state evaluation, the state from good to bad is divided into A (excellent), B (good), C (middle), D (poor), E (poor) 5 The grade is judged, the difference between the whole machine and the standard value is -78%, and it is in the A grade (excellent), and the diagnostic comprehensive report of the gas injection machine can be used with confidence. D: 030% is A (excellent), can be used with confidence; 30% between 60% is B (good), can continue to use; 60% between 90% is C (medium), can continue to use, but should Strengthen daily maintenance; between 90% and 120% is D (poor), should be maintained and adjusted in the near future; more than 120% is E (poor), should be shut down for repair, to avoid the vicious failure caused by continued use. It can be seen from the above diagnosis report that the gap of the 3-cylinder crosshead of the gas injection machine is large and loose, and the possibility of failure is 950%, but the evaluation of the whole machine is in the state of excellent state, and can be used with confidence. That is to say, the system adopts the automatic optimization standard, comprehensively utilizes the information of each component to obtain a comprehensive state index which can represent the working condition of the whole machine, so that the diagnosed machine is automatically compared with the diagnostic standard library, and the precise integration of the whole machine is obtained. Diagnostic report and actual compliance with the site. The establishment, improvement, collection and collation of the conclusion standard is an important basic work of equipment fault diagnosis. However, the diagnostic criteria used vary from company to company and from device to device. Therefore, each enterprise must proceed from the actual state of its own equipment and carry out comprehensive diagnosis. First, refer to the absolute standard, gradually accumulate the state data, establish the relative standards of equipment diagnosis, and further select sensitive parameters and effective methods. When the method is effective, what standards are established to establish the optimal diagnostic criteria that are more suitable for you. Accessories for Trolling Motor Electric Motor Shaft,Propeller Trolling Motor,Accessories For Trolling Motor,Electric Trolling Motor Accessories Ningbo Haishu Hongkang Outdoor Industry & Trade Co., Ltd , https://www.nbhktrollingmotor.com