What are the correction methods for ZQ750-48.57-1 gearbox shaft alignment and connection errors

ZQ750-48.57-1 reducer shaft alignment errors are mostly radial, angular, and comprehensive deviations, and connection errors are often caused by improper coupling and keyway matching. You can follow the process of correcting the alignment deviation first, then solving the connection problem, and finally verifying the effect. The specific method is as follows:

1. Correction of axis alignment errors

Preliminary preparation: Clean the surface oil and impurities of the coupling first, check if the shaft is bent, and if the radial runout of the shaft exceeds 0.05mm, straighten or replace the shaft first. Next, use a ruler or feeler gauge to make a rough alignment and preliminarily align the two halves of the coupling to avoid excessive deviation in subsequent fine-tuning. At the same time, use a feeler gauge to check the equipment base and eliminate the "soft foot" problem of poor contact between the base and the bottom plate. Priority should be given to using a laser alignment instrument for tools, and a dial gauge can also be used for ordinary scenarios.

Radial deviation correction: Radial deviation refers to two axes that are parallel but not concentric. Attach a dial gauge to one side of the coupling flange, with the gauge head against the outer surface of the other side flange. Rotate the two shafts to record the maximum and minimum readings, with half of the difference being the radial deviation. If the deviation exceeds the standard, adjust it by adding or removing thin steel shims on the motor or reducer base, with each adjustment not exceeding 0.5mm; use a laser alignment instrument to move the equipment horizontally by adjusting the bolts based on real-time data until the radial deviation is ≤ 0.05mm.

Correction of angular deviation: Angular deviation refers to the intersection of two axis centerlines at a certain angle. Place the dial indicator head against the flange end face on one side of the coupling, rotate the two shafts to record the difference in readings, which is the angular deviation. When adjusting, add or remove shims on one side of the equipment base. For example, if the left side is too high, add shims on the left base with a thickness of ≤ 0.1mm each time. If using a laser alignment instrument, adjust the angle of the front and rear anchor bolts of the equipment according to the prompts until the angular deviation is ≤ 0.05mm/m.

Comprehensive deviation correction: If two types of deviations exist simultaneously, adjust the angular direction first and then the radial direction to avoid "false deviation" in radial detection caused by angular deviation. After adjustment, rotate the coupling for one round of retesting, repeatedly adjust until both deviations meet the standard, then tighten the fixing bolts according to the principle of diagonal uniformity, and retest after tightening to prevent slight displacement caused by bolt tightening.

2. Correction of axis connection errors

Correction of Improper Coupling Assembly: If the coupling is too loose with the shaft and shakes during operation, the adapter coupling can be replaced or reinforced with an expansion sleeve; If the fit is too tight, do not strike it. Use sandpaper to lightly polish the shaft surface or the inner hole of the coupling to ensure a transition fit gap of 0.01-0.03mm. If the wrong coupling is selected, such as misusing a rigid coupling, it is necessary to replace it with an elastic coupling, reserve space for deviation compensation, and reduce the impact of centering deviation.

Correction of keyway and flat key coordination: When the flat key and keyway are too tight, use a file to lightly trim the inner wall of the keyway, clean the iron filings after trimming, and ensure smooth assembly; If it is too loose, replace the matching flat key or add a thin copper sheet to fill the gap on the key side to avoid transmission slippage. Ensure that the flat key fits tightly with the keyway during assembly, and that the flat key is installed in place to prevent displacement and damage to the shaft and coupling during operation.