AC alignment for pump machinery
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In the process of aligning pump couplings, the double-gauge method is commonly used to calculate the thickness of the shims that need to be added or removed. However, it is difficult to achieve accurate alignment in practice; often, even after adding the calculated amount of shims, the alignment is still incorrect, requiring multiple calculations and adjustments. Do you have any good practices from your experience that can help improve the efficiency of alignment? Let’s exchange ideas
Let me start by sharing my experience: 1. First, eliminate any wobbling by securing the unstable feet firmly. 2. Perform a rough horizontal alignment; the radial value in the horizontal direction should be between 0 and 0.05 mm, while the axial value is around 0.20 mm. 3. Tighten the motor’s foot screws symmetrically and diagonally, making sure to remember the order in which to tighten them. While tightening, adjust the dial indicator to the horizontal position and monitor the readings. Once the reading deviates from zero, stop immediately and try to bring the reading back to zero by adjusting the screws symmetrically and diagonally. 4. Then, record the readings around one full rotation, ensuring that a1 + a3 = a2 + a4 and s1 + s3 = s2 + s4. 5. Calculate the thickness of the shims needed based on these readings. Add the appropriate shims to the front and rear feet of the motor. When adding shims, loosen one set of screws first, add the shim, then tighten those screws before loosening the other set and adding another shim. This helps prevent excessive displacement of the motor and ensures that its position after adding the shims remains roughly the same as it was before calculation (you can also mark the positions of the feet and adjust those marks after adding the shims to keep the motor’s position unchanged). 6. Check whether the vertical readings are within acceptable limits. Then, loosen the foot screws again to perform fine horizontal alignment. Try to avoid any significant displacement of the motor during this process, aiming to return it to the position calculated earlier. Tighten the foot screws following step 3
In fact, there are now infrared coupling alignment instruments available that can be used as a reference
Search for the WeChat mini-program \"Rotation Device Three-Table Alignment\"
With high skill, the search is quick; an expert can handle it using just a feeler gauge or caliper, without the need for a measuring instrument