On-line dynamic balance adjustment system and control method based on temperature-controlled shape memory alloy

Abstract

The invention discloses an on-line dynamic balance adjustment system based on a temperature-controlled shape memory alloy and a control method thereof. The system comprises a balance head body. The balance head body comprises a shell. A rotating shaft passes through a through hole in the center of the shell to be fixedly connected with the shell. Four mass blocks are arranged around the through hole in the shell. Each mass block sleeves on an arc-shaped slide bar through an arc-shaped channel arranged on the mass block. Each arc-shaped slide bar is circumferentially distributed around the through hole. The two ends of each arc-shaped slide bar are fixed on the bracket in the shell. The arc-shaped slide bar arranged between the two ends of each mass block and the bracket is sleeved with a spring-shaped shape memory alloy. The spring-shaped shape memory alloy is electrically connected with the rotor part of a conductive slip ring, and the stator part of the conductive slip ring is electrically connected with a power supply device. The bearing support of the rotating shaft is provided with a vibration sensor used for measuring the imbalance amount in all directions during rotation ofthe rotating shaft. The dynamic balance can be realized through the current change, the principle is simple and miniaturization is easy and the system is suitable for high-precision rotor dynamic balance.

Description

technical field [0001] The invention relates to the technical field of high-speed dynamic balance of a rotating shaft, in particular to an online dynamic balance adjustment system and control method based on a temperature-controlled shape memory alloy. Background technique [0002] Rotor unbalance is caused by eccentric mass of rotor parts or defect of rotor parts. More than 70% of the vibration problems of rotating machinery are caused by rotor unbalance. It can be seen that rotor unbalance is an important cause of vibration of rotating machinery. In order to eliminate or reduce the vibration caused by unbalance, it is necessary to balance the rotor. [0003] Dynamic balance correction is to achieve dynamic balance by changing the mass distribution of the rotor so that its central axis of rotation coincides with the axis of rotation. During the dynamic balancing process, the mass distribution of the rigid rotor is uneven, and the vector sum of each centrifugal force is no...

AI Technical Summary

Problems solved by technology

[0004] At present, the vibration problem in the process of dynamic balancing has not been fully resolved, and its harm has become more and more prominent with the increasing level of machining. Now most of the rotating machines use off-line dynamic balancing to eliminate imbalance. The vibration caused by this method has many disadvantages:

[0005] (1) Offline dynamic balancing takes too much time and is expensive;

[0006] (2) If the distribution of unbalance changes during rotor operation, off-line balancing cannot solve the problem;

[0013] The online dynamic balance systems mentioned above all have deficiencies. For example, the dynamic balance correction by laser can only remove the weight, but cannot increase it. In addition, it will also damage the material to a certain extent, and its application in the industrial field is limited; The balance device of electromagnetic force is prone to nonlinear enhancement of distortion control during high-speed operation, and the difficulty of control is greatly increased; the balance method of mixed execution generally has the disadvantages of long balance time and cumbersome operation.

Images