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Shaft hole and rotor distribution method in equilibrium state when diaphragm coupling is hot-assembled

Author: Ever-Power Coupling Release Date: 2016-06-15 11:41 Click:
Coupling shaft hole interference cooperation is a kind of tight cooperation, that is to say, the matched shaft diameter (key width) is larger than the hole diameter (keyway), and there are special tools for kneading into it, or using thermal expansion and contraction. characteristic.

  Coupling shaft hole interference cooperation is a kind of tight cooperation, that is to say, the matched shaft diameter (key width) is larger than the hole diameter (keyway), and there are special tools for kneading into it, or using thermal expansion and contraction. Characteristic, heat the hole (keyway), take advantage of the expansion of the diameter, and sensitively sleeve it on the shaft. After cooling and shortening, the two parts are tightly integrated into one.The amount of interference is specified in the processing drawings.Assuming that some parts cannot be heated, the shaft (key) can also be cooled in dry ice, which has the same effect.If the coordination of the shaft hole tolerance is stricter, the looseness and tightness of the hole will affect the coupling equipment.
  Diaphragm coupling equipment has key connection and tension sleeve connection, which can also be divided into cold fitting and hot fitting. The tolerance of the coupling that needs to be hot fitting requires excessively tight cooperation.There are three types of shaft hole cooperation: It is transitional cooperation: when hole and shaft equipment, there may be open space or interference cooperation.As shown in the figure below, the tolerance zone of the hole and the tolerance zone of uranium overlap each other; the kind is air-ground cooperation: when the hole and the shaft equipment, there is the cooperation of the open space (including the small open space equal to zero).The third type is interference cooperation: there is interference between the hole and the shaft device (including the cooperation where the small interference is equal to zero).In the process of machining and manufacturing, the cooperation of two or more parts can be roughly divided into many levels such as sliding cooperation, transitional cooperation and tight cooperation.
  Rotor distribution method in balance state of coupling:
  1. Balance
  Coupling balance refers to a method of checking the mass distribution of the rotor.The mass distribution state should be adjusted to limit the vibration of the bearing journal or limit the force on the bearing.
  2. Types of imbalance
  1) Single-sided unbalanced state If the center of gravity of the object is not on the axis of rotation, a single-sided unbalanced state will appear.At this time, regardless of the relative position between the object and the axis, it will not be in a static equilibrium state.Place the journal of the unbalanced object on two parallel horizontal rods or guide rails, and you can observe the angular position and correction amount to be corrected in a single surface.The heavy side of the object always turns to the position below the axis immediately. The adjustment method is to add a counterweight to the radius position of the symmetry point between the heavy side of the object and the center of rotation. The static balancer can achieve single-sided balance without rotating the rotor. , Centrifugal balancing machines are also often used to achieve single-sided balancing.
  2) Double-sided unbalanced state. This kind of unbalanced state will appear when there is an unbalanced phase difference in the two planes. The phase difference is not 180 degrees, and the main axis of inertia at the same position as the axis of rotation has left the rotation. The axis is offset. Under normal circumstances, the two axes are skewed with each other. When the rotating cylinder with unbalanced moment, such as a coupling, is not restricted by the bearing, it will rotate around the main axis of inertia, and the main axis of inertia The line coincides with its geometric longitudinal axis.Moments of equal magnitude but opposite directions are sometimes referred to as couple imbalance.
  3. Balanced terms
  1) Rotation axis The rotation axis is the straight line around which the object rotates. The straight line is determined by the journal, the mating surface or the positioning surface of other surfaces.
  2) Offset of the principal axis of inertia The offset of the principal axis of inertia relative to the axis of rotation. The two axes may be parallel under special circumstances. The coupling is not balanced in most cases, so it is within two commonly used balance planes. The offset often varies.
  3) Rigid rotor rotor can be balanced and corrected in two arbitrarily selected planes, run at any speed, under working conditions close to the supporting point of the supporting device, and its imbalance will not significantly exceed the balance tolerance value, then the rotor is rigid Rotor.It should be noted that flexible couplings are usually composed of several parts, and the centering surface of these parts is intermittent and eccentric due to diameter errors.
 

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