Machine maintenance and transformation and upgrading

Transformation and upgrading of paper machine maintenance is 2019 - 05 - Along with the development of science and technology, the paper machine structure optimized constantly, the traditional paper machine equipment inspection methods ( Is mainly refers to listen to stick checking) And rely on experience to determine the method, equipment failure can not meet modern paper machine maintenance requirements. Especially the current annual output of 200000 tons, even 40, 800000 tons of paper machine, paper machine equipment maintenance personnel of equipment failure requirements to further improve the accuracy of the judgment, the equipment fault diagnosis technology to meet the demand. One big advantage is can make accurate judgment of equipment failure, and can be based on the maintenance strategy of equipment maintenance and make optimization formulation. Due to its own characteristics, mechanical structure will inevitably generate vibration in the running process. When the equipment operation condition does not change its vibration will remain in a relatively stable level. When the equipment malfunction, such as bearing damage, tooth gear crack, dynamic unbalance, etc. , its vibration situation will be changed accordingly. If you can find out the cause changes in the condition of equipment vibration source, and analysed, it can identify the cause of the equipment failure. But in the actual vibration data detection, vibration signal collected by the sensor, Vibration of the time-domain signal) Is the integrated embodiment of its equipment vibration. It contains both have produced during the normal operation of equipment vibration signals, also contains for vibration signals generated by the equipment failure, also contains noise and other disturbance signal. Such as direct analysis of vibration signals were collected, it will be hard to determine the fault source, impact on the accuracy of fault diagnosis. Fourier transform of complex time domain signal analysis into a simple frequency domain signal analysis. Through the analysis of the failure frequency, the equipment can be determined, the cause of the problem, thus may adopt targeted to fault equipment maintenance and repair strategy. Equipment fault diagnosis technology application equipment inspection personnel in the routine inspection found that the press section 2 abnormal pressure ZL roller gearbox vibration, due to the complexity of equipment structure, inspection personnel could not determine the specific reason for the abnormal vibration. To determine the vibration causes of ZL roller, the vibration data of gear box for collection. Through the analysis of spectrum, frequency is 97. 55 hz abnormal vibration performance, and also based on the frequency of harmonic (many times FIG. 1) 。 Figure 1 the gearbox vibration spectrum calculated by bearing type the failure frequency of each type of bearing, the specific data are shown in table 1. The data in table 1 comparison shows that the failure frequency spectrum caused by bearing inner ring 1 fault in the gear box. Due to the inner ring fault vibration, but also inspire the inner ring fault frequency 6 & times; Frequency doubling of bearing inner ring fault is very serious. Workshop according to the result of diagnosis, timely arrangements for paper machine downtime, and the gear box was targeted maintenance. Inspection found that the bearing (1 On the inside of the bearing) The inner ring (damaged FIG. 2) , consistent with the diagnosis. Damage reason for the gear box bearing lubricating oil pipe blockage, lead to damage of bearing oil shortage. Figure 2 can seriously damage the bearing inner ring ( Source: pulp technology)