Mandrel of ultra-high-speed air static pressure electric spindle

Abstract

The utility model relates to the technical field of mandrels, and discloses a mandrel of an ultra-high-speed air static pressure electric spindle, which comprises a mandrel body, an axial circle center hole, cylindrical magnetic steel and an axial limiting sleeve, and the axial circle center hole, the cylindrical magnetic steel and the axial limiting sleeve are sequentially arranged inside the mandrel body from left to right; positioning strips are fixedly arranged on the side wall of the cylindrical magnetic steel and the side wall of the axial limiting sleeve; positioning grooves matched with the positioning strips are formed in the inner wall of the mandrel body; a sealing cover is detachably arranged at the end, away from the axial circle center hole, of the mandrel body. The spindle is provided with the limiting mechanism, so that the stability of the cylindrical magnetic steel and the axial limiting sleeve in the spindle is improved, and the stability of ultrahigh-speed rotation of the spindle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of spindles, in particular to a spindle of an ultra-high-speed air static pressure electric spindle. Background Art

[0002] At present, the maximum speed of the air static pressure electric spindle produced domestically can reach more than 300,000 rpm. When the ultra-high-speed motor runs at high speed, the rotor is subjected to extremely large centrifugal force. The strength of the rotor needs to be within the allowable stress range of the material, and the rotor dynamics performance needs to be guaranteed to be good.

[0003] Among them, the patent number is CN114042946B, which discloses a core shaft of an ultra-high-speed air hydrostatic electric spindle, which includes a core shaft, in which L1 section, L2 section and L3 section are arranged from left to right, a first axial concentric hole is arranged at the L1 section, a cylindrical magnetic steel is arranged at the L2 section, an axial limit sleeve is arranged at the L3 section, and a second axial concentric hole is arranged in the axial limit sleeve.

[0004] In the above scheme, a cylindrical magnetic steel and an axial limit sleeve are arranged inside the core shaft. However, during the rotation of the core shaft, the cylindrical magnetic steel and the axial limit sleeve do not have any limit structure, which causes the cylindrical magnetic steel and the axial limit sleeve to rotate inside the core shaft, thereby affecting the rotation effect of the core shaft. To this end, a core shaft of an ultra-high-speed air static pressure electric spindle is proposed. Utility Model Content

[0005] The utility model aims to solve the problems raised by the background technology and proposes a core shaft of an ultra-high-speed air static pressure electric spindle.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A core shaft of an ultra-high-speed air static pressure electric spindle comprises a core shaft body, an axial center hole, a cylindrical magnetic steel and an axial limit sleeve, wherein the axial center hole, the cylindrical magnetic steel and the axial limit sleeve are sequentially arranged inside the core shaft body from left to right; the side walls of the cylindrical magnetic steel and the side walls of the axial limit sleeve are fixedly provided with positioning strips, and the inner wall of the core shaft body is provided with a positioning groove matching the positioning strip; a cover is detachably provided at one end of the core shaft body away from the axial center hole.

[0008] Preferably, the number of the positioning strips on the cylindrical magnetic steel and the axial limiting sleeve is two, and the number of the positioning grooves is two.

[0009] Preferably, the positioning groove is arranged at an end portion of the core shaft body that is away from the axial center hole.

[0010] Preferably, a threaded ring is fixedly provided on the side wall of the sealing cover, and a threaded groove matching with the threaded ring is formed at the end of the core shaft body.

[0011] Preferably, the circumferential wall of the cover is provided with anti-slip textures.

[0012] Preferably, a thrust plate and a handle are provided at one end of the core shaft body away from the sealing cover.

[0013] Compared with the prior art, the utility model provides a core shaft of an ultra-high-speed air static pressure electric spindle, which has the following beneficial effects:

[0014] 1. The core shaft of the ultra-high-speed air static pressure electric spindle has a positioning strip set on the cylindrical magnetic steel and the axial limiting sleeve. The cylindrical magnetic steel and the axial limiting sleeve can be inserted into the interior of the core shaft through the cooperation of the positioning strip and the positioning groove, so that the positions of the cylindrical magnetic steel and the axial limiting sleeve are restricted, which can ensure that the cylindrical magnetic steel and the axial limiting sleeve will not rotate during the rotation of the core shaft, thereby improving the stability of the high-speed rotation of the core shaft.

[0015] 2. The core shaft of the ultra-high-speed air static pressure electric spindle is provided with a cover, which can seal the end of the core shaft to prevent the cylindrical magnetic steel and the axial limit sleeve from detaching from the inside of the core shaft.

[0016] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model has a limiting mechanism, which increases the internal stability of the cylindrical magnetic steel and the axial limiting sleeve on the core shaft, and improves the stability of the ultra-high-speed rotation of the core shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a core shaft of an ultra-high-speed air static pressure electric spindle proposed by the utility model;

[0018] Figure 2 for Figure 1 A side view of the middle axial limit sleeve;

[0019] Figure 3 for Figure 1 A three-dimensional view of the middle cover.

[0020] In the figure: 1. Mandrel body; 2. Axial center hole; 3. Cylindrical magnetic steel; 4. Axial limit sleeve; 5. Positioning strip; 6. Positioning groove; 7. Cover; 8. Threaded ring; 9. Threaded groove; 10. Anti-slip pattern; 11. Thrust plate; 12. Tool handle. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Example 1

[0023] Reference Figure 1-2 , a core shaft of an ultra-high-speed air static pressure electric spindle, comprising a core shaft body 1, an axial center hole 2, a cylindrical magnetic steel 3 and an axial limiting sleeve 4, the axial center hole 2, the cylindrical magnetic steel 3 and the axial limiting sleeve 4 are arranged in sequence from left to right inside the core shaft body 1, and a thrust plate 11 and a tool handle 12 are provided at one end of the core shaft body 1 away from the axial limiting sleeve 4. By utilizing the mechanical properties of the permanent magnet material that is resistant to compression but not to tension, a rotor structure of a circular structure magnetic steel + an integrated sheath and a rotating shaft is designed to reduce the centrifugal force carried by the rotor while increasing the tensile strength of the magnetic steel. This is a structure in a comparative document, so no detailed functional introduction is made; the side wall of the cylindrical magnetic steel 3 and the axial limiting The side walls of the positioning sleeve 4 are fixed with positioning strips 5, and the inner wall of the core shaft body 1 is provided with positioning grooves 6 that cooperate with the positioning strips 5. The positioning groove 6 is arranged at the end of the core shaft body 1 away from the axial center hole 2. There are two positioning strips 5 on the cylindrical magnetic steel 3 and the axial limiting sleeve 4, and there are two positioning grooves 6. The cylindrical magnetic steel 3 and the axial limiting sleeve 4 can be inserted into the interior of the core shaft 1 through the cooperation of the positioning strips 5 and the positioning grooves 6, so that the positions of the cylindrical magnetic steel 3 and the axial limiting sleeve 4 are limited, which can ensure that the cylindrical magnetic steel 3 and the axial limiting sleeve 4 will not rotate during the rotation of the core shaft 1, thereby improving the stability of the high-speed rotation of the core shaft 1.

[0024] Example 2

[0025] Reference Figure 1 and 3 A cover 7 is detachably provided at one end of the core shaft body 1 away from the axial center hole 2, a threaded ring 8 is fixedly provided on the side wall of the cover 7, a threaded groove 9 matching with the threaded ring 8 is opened at the end of the core shaft body 1, and an anti-slip pattern 10 is provided on the circumferential wall of the cover 7. The cover 7 is held tightly by hand and rotated so that the threaded ring 8 is threadedly connected with the threaded groove 9 on the core shaft 1, so that the cylindrical magnetic steel 3 and the axial limiting sleeve 4 can be sealed and fixed inside the core shaft 1.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A spindle of an ultra-high-speed air static pressure electric spindle, comprising a spindle body (1), an axial center hole (2), a cylindrical magnetic steel (3) and an axial limit sleeve (4), characterized in that: The axial center hole (2), the cylindrical magnetic steel (3) and the axial limiting sleeve (4) are arranged inside the core shaft body (1) in sequence from left to right; The side walls of the cylindrical magnetic steel (3) and the side walls of the axial limiting sleeve (4) are both fixedly provided with positioning strips (5), and the inner wall of the core shaft body (1) is provided with positioning grooves (6) matching with the positioning strips (5); A sealing cover (7) is detachably provided at one end of the core shaft body (1) away from the axial center hole (2).

2. The core shaft of the ultra-high-speed air static pressure electric spindle according to claim 1, characterized in that: The number of the positioning strips (5) on the cylindrical magnetic steel (3) and the axial limiting sleeve (4) is two, and the number of the positioning grooves (6) is two.

3. The core shaft of the ultra-high-speed air static pressure electric spindle according to claim 1, characterized in that: The positioning groove (6) is arranged at an end that is away from the axial center hole (2) and passes through the end of the core shaft body (1).

4. The core shaft of the ultra-high-speed air static pressure electric spindle according to claim 1, characterized in that: A threaded ring (8) is fixedly provided on the side wall of the sealing cover (7), and a threaded groove (9) matching with the threaded ring (8) is provided at the end of the core shaft body (1).

5. The core shaft of the ultra-high-speed air static pressure electric spindle according to claim 1, characterized in that: The circumferential wall of the sealing cover (7) is provided with anti-slip patterns (10).

6. The core shaft of the ultra-high-speed air static pressure electric spindle according to claim 1, characterized in that: A thrust plate (11) and a knife handle (12) are provided at one end of the spindle body (1) away from the sealing cover (7).

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