Hollow air floatation rotating shaft with multiple radial holes and axial holes communicated at shaft neck end

Abstract

The utility model discloses a hollow air floatation rotating shaft with a plurality of radial holes and axial holes communicated at a journal end, which comprises a shell, a grinding wheel connecting rod seat is arranged at one end of the shell, a rotating shaft is rotatably connected in the shell, a rotor is arranged at one end of the shell far away from the grinding wheel connecting rod seat, and a hollow shaft axial hole is arranged at the center of the rotating shaft. Rotating shaft radial air holes are formed in the periphery of the hollow shaft axial hole; air flow enters from the radial air hole of the rotating shaft at the shaft neck position and is discharged from the axial hole of the hollow shaft in a spiral motion mode, heat of the rotating shaft can be effectively brought out, the temperature of the rotating shaft is reduced, the damping force of the rotating shaft is increased through inertia changes of air flow, the resonance and self-excitation unstable amplitude is effectively reduced, and the dynamic performance of the main shaft is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hollow shaft technical field, concretely is a hollow air floatation rotating shaft that multiple radial holes and axial hole communicate at the neck end of the shaft. BACKGROUND

[0002] Most air static pressure journal bearings will show self-excited vibration, and currently hollow shafts mainly solve the problem of reducing mass and reducing rotational inertia to improve rotating speed and rotating performance of the rotating shaft, but high-speed air floatation grinding and cutting spindles not only have requirements for rotating speed and rigidity, but also have more stringent requirements and control on temperature rise, resonance and whirling self-excitation instability in operation. SUMMARY

[0003] The utility model discloses a hollow air floatation rotating shaft that multiple radial holes and axial hole communicate at the neck end of the shaft to solve the problem in the background art.

[0004] To achieve the above object, the utility model provides the following technical scheme: a hollow air floatation rotating shaft that multiple radial holes and axial hole communicate at the neck end of the shaft, including the shell, the shell one end is equipped with the grinding wheel interface pole seat, the shell inside rotation is connected the rotating shaft, the shell is equipped with the rotor with the grinding wheel interface pole seat away, the center position of rotating shaft is equipped with hollow shaft axial hole, the periphery of hollow shaft axial hole is equipped with rotating shaft shaft radial air hole, the clearance space between shell and rotating shaft is radial bearing exhaust ring groove, rotating shaft shaft radial air hole and radial bearing exhaust ring groove correspond.

[0005] Preferably, the hollow shaft axial hole communicates with the rotating shaft shaft radial air hole, the rotating shaft shaft radial air hole is a inclined hole opened along the rotation direction, and the end of the inclined hole is chamfered.

[0006] Preferably, the rotating shaft shaft radial air hole is arranged at the neck flange of the rotating shaft.

[0007] Compared with the prior art, the utility model has the beneficial effects that: by utilizing the air flow into the rotating shaft shaft radial air hole from the neck position and then spirally moving out of the hollow shaft axial hole, the heat of the rotating shaft can be effectively taken out, the temperature of the rotating shaft is reduced, the air flow inertia change increases the damping force of the rotating shaft, effectively reduces the resonance and self-excitation instability amplitude, and the dynamic performance of the spindle is obviously improved. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 The overall structure of the utility model is shown in the schematic diagram.

[0009] Figure 2 The A place of the utility model is shown in the schematic diagram.

[0010] In the figure: 1, the shell; 2, the grinding wheel connecting rod seat; 3, the rotating shaft; 4, the rotor; 5, the hollow shaft axial hole; 6, the rotating shaft radial air hole. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0012] Please refer to 1-2, an embodiment provided by the utility model: a hollow air floating rotating shaft with multiple radial holes and axial holes in the neck end, comprising a shell 1, the shell 1 is provided with a grinding wheel connecting rod seat 2 at one end, a rotating shaft 3 is rotatably connected inside the shell 1, the shell 1 is provided with a rotor 4 at the end away from the grinding wheel connecting rod seat 2, a hollow shaft axial hole 5 is arranged at the center position of the rotating shaft 3, a rotating shaft radial air hole 6 is arranged around the hollow shaft axial hole 5, there is a gap space between the shell 1 and the rotating shaft 3, which is a radial bearing exhaust ring groove, the rotating shaft radial air hole 6 corresponds to the radial bearing exhaust ring groove, air enters the hollow shaft axial hole 5 from the rotating shaft radial air hole 6, due to the rotation of the rotating shaft 3 inside the shell 1, the air spirally moves out, the flow of air is increased, thereby reducing the temperature, the inertial change of air flow increases the damping force of the rotating shaft, effectively reduces the resonance and self-excitation instability amplitude, and the dynamic performance of the main shaft is obviously improved.

[0013] The hollow shaft axial hole 5 is communicated with the rotating shaft radial air hole 6, the rotating shaft radial air hole 6 is an inclined hole arranged along the rotating direction, the rotating shaft radial air hole 6 can also be a straight hole, the port of the inclined hole is chamfered, the air inlet is smoother and whistle sound is avoided.

[0014] The rotating shaft radial air hole 6 is arranged at the neck flange of the rotating shaft 3, at the first time of air inlet, the air can enter the rotating shaft radial air hole 6 from the neck flange, and the flow speed of air is improved.

[0015] Working principle: in use, air enters the inside of the shell 1 from the neck flange of the shaft neck flange of the grinding wheel connecting rod seat 2, at the first time of air inlet, the air enters the hollow shaft axial hole 5 from the rotating shaft radial air hole 6, due to the rotation of the hollow shaft axial hole 5 with the rotating shaft 3, the air flow is rotated, the air spirally moves out, the flow of air is increased, the air flow is also dragged into the hollow shaft axial hole 5, the inertial change of air flow increases the damping force of the rotating shaft, effectively reduces the resonance and self-excitation instability amplitude, and the dynamic performance of the main shaft is obviously improved.

Claims

1. A hollow gas-floated rotating shaft with a plurality of radial holes communicating with axial holes in the journal end, comprising a shell (1), characterized in that: The shell (1) is provided with a grinding wheel connecting rod seat (2) at one end, the shell (1) is rotatably connected with a rotating shaft (3) inside, the shell (1) is provided with a rotor (4) at the end away from the grinding wheel connecting rod seat (2), the center of the rotating shaft (3) is provided with a hollow shaft axial hole (5), the periphery of the hollow shaft axial hole (5) is provided with a rotating shaft shaft radial air hole (6), the gap space between the shell (1) and the rotating shaft (3) is a radial bearing exhaust ring groove, and the rotating shaft shaft radial air hole (6) corresponds to the radial bearing exhaust ring groove.

2. The hollow gas-floated rotating shaft with a plurality of radial holes communicating with axial holes at the journal end according to claim 1, characterized in that: The hollow shaft axial hole (5) is communicated with the rotating shaft shaft radial air hole (6), the rotating shaft shaft radial air hole (6) is an inclined hole opened along the rotating direction, and the port of the inclined hole is chamfered.

3. The hollow gas-floated rotating shaft with multiple radial holes communicating with axial holes at the journal end according to claim 1, characterized in that: The rotating shaft shaft radial air hole (6) is arranged at the shaft neck flange of the rotating shaft (3).

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