Magnetic auxiliary support structure for stirring shaft and intelligent monitoring method

An intelligent monitoring method for a stirring shaft, wherein a magnetic auxiliary support structure is adopted, the magnetic auxiliary support structure comprises an inner magnetic member and an outer magnetic member, the inner magnetic member is fixedly connected to the stirring shaft, the outer magnetic member is sleeved around an outer side of the inner magnetic member and fixedly mounted, the inner magnetic member and the outer magnetic member are arranged in a magnetically repulsive manner, and a repulsive force generated between the inner magnetic member and the outer magnetic member is uniformly distributed in a circumferential direction of the stirring shaft, the intelligent monitoring method comprising the following steps:

• S100:
• mounting a sensor at a position of matching between the inner magnetic member and the outer magnetic member;
• S200:
• monitoring, through the sensor, a variation in a motion field formed by relative motion of the inner magnetic member and the outer magnetic member during rotation of the stirring shaft;
• S300:
• substituting the obtained variation in the motion field into a derivation formula to calculate an actual deflection of the stirring shaft;
• S400:
• comparing the obtained actual deflection with a preset threshold to determine an operational state of the stirring shaft;
• wherein the sensor installed in S100 is a magnetic sensor, and is configured to monitor variation in magnetic field intensity at a position of the magnetic sensor during the rotation of the stirring shaft;
• in S300, a derivation formula for calculating an actual deflection (d) of the stirring shaft is as follows:
• d
• =
• r
• -
• r
• 0
• ;
• r
• =
• r
• 0
• ·
• M
• 0
• M
• 3
• ;
• in the formulas, r0 represents a theoretical distance between the inner magnetic member and the magnetic sensor, r represents an actual distance between the inner magnetic member and the magnetic sensor, M0 represents a theoretical peak magnetic field intensity of the inner magnetic member at the position of the magnetic sensor, and M represents an actual peak magnetic field intensity of the inner magnetic member at the position of the magnetic sensor;
• or
• the sensor installed in S100 is a pressure sensor, and is connected to the external magnetic member and configured to monitor variation in magnetic force of the external magnetic member corresponding to a mounting position of the pressure sensor during the rotation of the stirring shaft;
• in S300, the derivation formula for calculating the actual deflection (d) of the stirring shaft is as follows:
• d
• =
• r
• 2
• -
• r
• 1
• ;
• r
• 1
• =
• μ
• 0
• ·
• M
• a
• 2
• ·
• V
• 1
• ·
• V
• 2
• 4
• ⁢
• π
• ·
• F
• 1
• ;
• r
• 2
• =
• μ
• 0
• ·
• M
• a
• 2
• ·
• V
• 1
• ·
• V
• 2
• 4
• ⁢
• π
• ·
• F
• 2
• ;
• in the formulas, r1 represents a theoretical distance between the inner magnetic member and the outer magnetic member, r2 represents an actual distance between the inner magnetic member and the outer magnetic member, F1 represents a theoretical repulsive force between the inner magnetic member and the outer magnetic member, F2 represents an actual repulsive force between the inner magnetic member and the outer magnetic member monitored by the pressure sensor, μ0 represents magnetic permeability in vacuum, Ma represents a magnetic moment magnitude, V1 represents a volume of the inner magnetic member, and V2 represents a volume of the outer magnetic member.