Air floatation electric spindle with damping cavity on rotating shaft flange

Abstract

The utility model discloses an air floatation motorized spindle with a damping cavity on a rotating shaft flange, which comprises a rotating shaft shell, a thrust bearing is arranged at one end of the rotating shaft shell, a plurality of throttling air taps are arranged on the thrust bearing, a closed air cavity is arranged on the rotating shaft shell, an air inlet is arranged on one side of the closed air cavity facing the thrust bearing, and a damping cavity is arranged on the other side of the closed air cavity. A sealing jackscrew is arranged above the closed air cavity, the pressure of the closed air cavity is maximum at the corresponding moment through the throttling air nozzle and the air inlet, air in the closed air cavity is slightly compressed, the air in the closed air cavity is exhausted to generate oscillation when the closed air cavity is staggered, and air hammer excitation generated between the damping thrust bearing and the flange is disturbed by air oscillation. The effects of reducing spindle vibration and improving high-frequency harmonic waves are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of aerostatic spindles, in particular to an aerostatic spindle with a damping cavity on the rotating shaft flange. Background Technique

[0002] Most aerostatic thrust bearings will show self-excited vibration because a certain volume of the air cavity requires a certain time to fill and empty the gas. The change of the squeeze film is proportional to the speed of the thrust plate to form a damping force, and the bearing is in a stable state. When the volume effect of the air cavity is greater than the squeeze film effect, the damping decreases, and the bearing is unstable. When there is a deviation from the equilibrium state, only a very small disturbance is needed to excite the vibration with an increasing amplitude. Content of the Utility Model

[0003] The purpose of the utility model is to provide an aerostatic spindle with a damping cavity on the rotating shaft flange to solve the problems put forward in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical scheme: an aerostatic spindle with a damping cavity on the rotating shaft flange, including a rotating shaft housing, one end of the rotating shaft housing is provided with a thrust bearing, a plurality of throttle nozzles are opened on the thrust bearing, a closed air cavity is provided on the rotating shaft housing, an air inlet is provided on one side of the closed air cavity facing the thrust bearing, and a sealing plug screw is provided above the closed air cavity.

[0005] Preferably, the air inlets are equally divided in the circumferential direction on the rotating shaft housing.

[0006] Compared with the prior art, the beneficial effect of the utility model is that: when the throttle nozzle and the air inlet correspond, the pressure in the closed air cavity is the largest, the gas inside the closed air cavity is slightly compressed, and when they are staggered, the gas in the closed air cavity is discharged to generate oscillation. The gas oscillation interferes with the air hammer excitation generated between the damping thrust bearing and the flange, achieving the reduction of the spindle vibration and the improvement of the high-frequency harmonic effect. Description of the Drawings

[0007] Figure 1 is the overall structural schematic diagram of the utility model;

[0008] Figure 2 is the schematic cross-sectional view A of the utility model;

[0009] Figure 3 is the schematic cross-sectional view B of the utility model.

[0010] In the figure: 1, rotating shaft housing; 2, thrust bearing; 3, throttle nozzle; 4, closed air cavity; 5, sealing plug screw; 6, air inlet. Detailed Embodiment

[0011] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0012] Please refer to 1-3, an embodiment provided by the utility model: an air-floating electric spindle with a shaft flange and a damping chamber, comprising a shaft housing 1, a thrust bearing 2 is provided at one end of the shaft housing 1, a plurality of throttling air nozzles 3 are provided on the thrust bearing 2, a closed air cavity 4 is provided on the shaft housing 1, an air inlet 6 is provided on the side of the closed air cavity 4 facing the thrust bearing 2, and a sealing top screw 5 is provided above the closed air cavity 4. When the thrust bearing 2 rotates, it drives the throttling air nozzle 3 to rotate. When the throttling air nozzle 3 corresponds to the air inlet 6, outside air will enter the closed air cavity 4, and an independent damping air chamber is completed. Damping force is generated when the air flows in and out, thereby eliminating the unstable state of the air-floating thrust bearing.

[0013] The air inlets 6 are equally divided on the circumference of the rotating shaft housing 1 and can correspond to the air inlets 6 regularly to achieve reciprocating air intake and exhaust.

[0014] Working principle: When the thrust bearing 2 rotates, the throttle nozzle 3 located on the thrust bearing 2 will regularly correspond to the air inlet 6. The pressure in the closed air cavity 4 is maximum at the moment when the throttle nozzle 3 and the air inlet 6 correspond to each other, and the gas inside the closed air cavity 4 is slightly compressed. When the throttle nozzle 3 and the air inlet 6 are staggered, the gas in the closed air cavity 4 is discharged to generate vibration, thereby eliminating the unstable state of the air-floating thrust bearing.

Claims

1. An air-bearing motorized spindle with a damping chamber on the shaft flange, comprising a shaft housing (1), characterized in that: One end of the rotating shaft housing (1) is provided with a thrust bearing (2). A plurality of throttle nozzles (3) are formed in the thrust bearing (2). A closed air cavity (4) is arranged on the rotating shaft housing (1). An air inlet (6) is arranged on one side of the closed air cavity (4) facing the thrust bearing (2). A sealing set screw (5) is arranged above the closed air cavity (4).

2. The aerostatic motorized spindle with a rotating shaft flange and a damping cavity according to claim 1, wherein: The air inlet (6) is equally divided in the circumferential direction on the rotating shaft housing (1).

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