tailieunhanh - Handbook of Shaft Alignment Part 12

Tham khảo tài liệu 'handbook of shaft alignment part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | a 520 Shaft Alignment Handbook Third Edition The target bar can be attached to either the driver or The probe bar can be attached to either the driver Measuring and Compensating for Off-Line or the driven unit b the driven unit FIGURE Alignment bar arrangements. Upper diagram Courtesy of Scientific Atlanta SKF Condition Monitoring San Diego CA. With permission. Cl 1C 522 Shaft Alignment Handbook Third Edition Probe bar H -shaped base to allow for positioning the bar in the up Angle iron and down direction Target bar H -shaped base to allow for positioning the bar in the sideways direction End view of bars and probes FIGURE Fabricated alignment bar design. Advantages Fairly accurate measurements possible with proper setup. Capable of measuring movement in vertical and horizontal directions. Can continuously monitor positions of machinery without disturbing sensors or bars. If the machinery is vibrating excessively when taking the running measurements the proximity probes average the oscillation effectively to insure accurate distances between the probe tips and the targets. Can be equipped to measure axial growth if desired. Disadvantages Knowledgeable patient and dedicated personnel required for successful measurements and evaluation of data. Custom brackets and bars have to be designed fabricated and carefully installed on each machine case as close as possible to the centerline of rotation. If the machinery is moving considerably from OL2R conditions the proximity probes can bottom out on the target or move out of the linear range of the probes. Thermal casing distortion where the probe and target bars are attached could result in data that are not representatives of the movement of the centerline of rotation of the shafts. Somewhat expensive since custom braces and bars have to be fabricated probes cables proximitors readout devices and power supplies have to be purchased. APPLYING LASER-DETECTOR SYSTEMS FOR OL2R MEASUREMENTS Laser-detector .