Plum coupling alignment principle: mainly measure its radial displacement and angular displacement. When the two shafts are on different axes, there is a relative deviation between the outer rings or end faces of the two couplings. According to the measured deviation value, the deviation value of the axis can be calculated. In order to obtain correct measurement results, the two rotors must be rotated by the same angle, and the relative position of the measuring points on the coupling must be changed, so that the errors caused by the uneven surface of the coupling and the non-perpendicular axis of the end face can be eliminated.

Before installation, the projection of the motor's movable end face circle on the fixed end face is approximately regarded as a perfect circle, because the distance from the center of the movable end face to the fixed end face is constant. If the requirements are to be met at the same time, the axis of the movable end and the axis of the fixed end are absolutely in a straight line, which is only an ideal alignment state. When actually aligning, the allowable error is set first, and when the error caused by the alignment is within the allowable error range, the alignment is completed. In many cases, the lower detection point of the pump cannot be detected, and the alignment work cannot be carried out. Use a dial indicator to detect the runout of the flange surface and the outer circle of the two halves of the coupling. When the outer circle of the flange is less than 250mm, the runout value should not be greater than 0.05mm; when the outer circle of the flange is greater than 250mm, the runout value should not be greater than 0.08.

Specific steps are as follows:

Alignment steps for pipe couplings:

1. Operator's Note: Before starting the equipment, check whether the nut of the plum coupling is loose or falling off. If so, use a wrench to tighten the nut in time. The plum blossom elastic coupling has basic type, single flange connection type, double flange connection type and brake wheel type. The main process is to first turn the car into position, then wash the claws, insert the parts, and finally complete the surface treatment, usually blackening.

2. In order to facilitate installation, it is best to preheat the two halves of the coupling in a 120-150 incubator or oil tank, which can expand the size of the inner hole and facilitate installation. After installation, make sure that the shaft head cannot protrude from the end face of the half coupling, preferably flush. Test the distance between the coupling halves: measure the readings of 3-4 points along the two inner sides of the coupling halves, take the average value, and measure the sum of the dimensions of the extension and the two diaphragm sets , the error between them is controlled at 0-0.4 mm. Alignment: Use a dial indicator to detect the runout of the flange surface and the outer circle of the two halves of the coupling. When the outer circle of the flange is less than 250mm, the runout value should not be greater than 0.05mm; when the outer circle of the flange is greater than 250mm, the runout value should not be greater than 0.08.

3. Install bolts: Pass the bolts through the outside of the small hole of the flange, and pass through the outside of the other large hole of the flange, put on the buffer sleeve and elastic washer, screw on the nut, and tighten the nut with a wrench. If installed improperly or removed and replaced, the shaft and half coupling are not damaged, and after installation, it is best to rotate freely without effort.

4. Before installing the plum blossom elastic coupling, first check whether the two shafts of the prime mover and the working machine are concentric, whether there is wrapping paper and bumps on the surface of the two shafts, and whether the inner holes of the two halves of the plum blossom coupling have any Sundries, whether there are bumps on the edge of the inner hole. If so, the shaft and coupling halves should be cleaned and the abrasions should be treated with a fine file. Then check whether the diameter and length of the inner hole of the coupling halves are consistent with the diameter and axial length of the prime mover and the working machine. Generally, in the selection, it is best to make the length of the end-half coupling between the prime mover and the working machine less than its axial extension by 10-30 mm.

Matters needing attention

The plum blossom-shaped elastic coupling has a polyurethane elastomer in the middle and half couplings with claws at both ends, also known as claw couplings.

The plum-shaped elastic coupling is mainly composed of two closely meshed convex teeth, which can withstand radial extrusion and transmit torque. When the two axes are offset relative to each other, the elastic element deforms elastically, which plays an automatic compensation role.