# How to measure when the self-priming fluoroplastic pump coupling is aligned?

Update: 26-10-2019

Abst:

The fluoroplastic self-priming pump coupling is mainly […]

The fluoroplastic self-priming pump coupling is mainly used to measure its radial displacement (or radial clearance) and angular displacement (or axial clearance).
1 Measure the radial displacement of the coupling with a ruler and feeler gauge, and measure the angular displacement of the coupling with a flat gauge and a wedge gauge. This measurement method is simple but not very accurate, and can only be applied to rough low-speed machines that do not need to be aligned.
2 Use the center card and the dial gauge to measure the radial clearance and axial clearance of the coupling. Because the high accuracy dial gauge is used to measure the radial clearance and the axial clearance, the accuracy of this method is high, and it is suitable for precision machines and high speed machines that need to find the center. This method of aligning measurement is convenient to operate, high in precision, and widely used.
When using the center card and the dial indicator to measure the radial clearance and axial clearance of the coupling, a common method is used for the measurement. The so-called one-point method refers to measuring the radial gap at the same position while measuring the axial gap at the same position. When measuring, first install the center card, and rotate the two couplings together in the same direction, so that the center card is first in the vertical position (0°), and measure the radial clearance m and the axial direction with a dial indicator. The gap then turns the two halves of the coupling to three positions of 90°, 180°, and 270°, respectively, and a2, 52 are measured; a3, 53; a4. The measured values ​​are recorded in the record.
When the two couplings are turned to the 0° position again, the values ​​of the radial clearance and the axial clearance are measured again as 4, where the value should be equal to M and ^. If a is off ai, s'l^s1, then the cause (axial agitation) must be checked and eliminated, and then the measurement is continued until the measured value is correct. In the case of a small offset, the measured data should meet the following conditions
Ai +?3 -<22 +<24 ; Si+S3=S2+S4
During the measurement process, if the radial clearance illusion and axial clearance h at the low position of the fluoroplastic self-priming pump coupling are not measurable due to the influence of the basic construction, the other three measured gap values ​​may be used. Infer
3 =ai -<21 ; 53 =52 +?4 a 51
Compare the values ​​of the two radial gaps and the axial gap on the symmetry point (such as ^ and , & and ^). If the difference between the values ​​of the symmetrical points does not exceed the specified value, it is considered to meet the requirements, otherwise it will be adjusted. Adjustments are usually made by adding or subtracting the spacer under the active machine foot in the vertical direction or moving the position of the active machine in the horizontal direction.
For rough and small machines, when adjusting, take a gradual approximation of the empirical method to adjust according to the offset (ie, try to add or try to reduce the gasket, and tap the mobile active machine left and right). For precision and large machines, when adjusting, the thickness of the gasket and the amount of movement to the left and right should be determined by calculation.
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