Shape memory alloy-driven online dynamic balance adjustment device

Abstract

The invention discloses a shape memory alloy-driven online dynamic balance adjustment device, which comprises a balance head part and a conductive slip ring part, wherein the balance head is internally provided with a flexible ring which can be driven by a temperature-controlled memory alloy, and the flexible ring is deformed radially by the tensile drive of the memory alloy wire; the flexible ring and an outer rigid weight ring are meshed by teeth; and through controlling the power-on sequence of the memory alloy, the corresponding part of the flexible ring is stretched radially to realize the alternating change of the meshing part with the rigid weight ring. Through alternating meshing, circumferential displacement relative to the flexible ring fixed to the shell can be generated by therigid weight ring, the center of mass distribution is thus changed, and the purpose of dynamic balance is achieved. The structure form is concise, miniaturization is facilitated, self-locking in a power-off state can be carried out, and high-speed and high-precision rotor dynamic balance is facilitated.

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 device driven by a shape memory alloy. Background technique [0002] Modern high-speed precision machining equipment has the characteristics of high spindle speed, high running precision and high processing efficiency. For the main shaft, due to factors such as manufacturing and installation errors and uneven materials, the existence of unbalance is inevitable. The unbalanced spindle rotor will lead to spindle system vibration, noise, and bearing heating, etc., which will affect the machining accuracy. In severe cases, the spindle may even be unbalanced due to excessive spindle vibration. For this, the spindle needs to be dynamically balanced. [0003] Currently, most rotating machines use off-line dynamic balancing to eliminate vibrations caused by unbalance. However, the traditional off-line dynamic ...

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Problems solved by technology

[0004] ① Time-consuming and inefficient;

[0005] ② If the unbalance distribution is disturbed and changed during the operation of the shaft, the offline dynamic balance will not work

[0006] ③When the precision machining equipment is running at high speed or even ultra-high speed, the dynamic characteristics of the rotor have changed, and its vibration behavior has shown a certain flexibility. At this time, the off-line dynamic balance will not be able to meet the needs of high-speed precision spindle dynamic balance

[0011] The online dynamic balance system mentioned above has some shortcomings. The laser deweighting method cannot restore the state before the adjustment, and the auxiliary equipment is complicated, and it is difficult to realize industrially; the balance device using electromagnetic force compensation consumes a lot of energy, and when it is running Non-linear enhancement of distortion control will occur in the magnetic field, and the control is difficult; the hybrid execution type generally has the disadvantages of long balancing time, cumbersome operation and complex mechanical structure

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