CN216881747U

CN216881747U - High-rigidity lathe spindle

Info

Publication number: CN216881747U
Application number: CN202221388676.9U
Authority: CN
Inventors: 苏佳和
Original assignee: Quanzhou Minghong Machinery Co ltd
Current assignee: Quanzhou Minghong Machinery Co ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2022-07-05
Anticipated expiration: 2032-06-06

Abstract

The utility model discloses a high-rigidity lathe spindle, which relates to the technical field of machining equipment and comprises a shell, a spindle, a first bearing, a second bearing, a third bearing, a first pre-tightening assembly and a second pre-tightening assembly, wherein the shell is provided with a first end and a second end; the main shaft is arranged in the shell, and a bearing cavity is arranged between the main shaft and the shell; the first bearing and the second bearing are mutually arranged at the front end of the bearing cavity in parallel through a first pre-tightening assembly; the third bearing is arranged at the rear end of the bearing cavity through a second pre-tightening assembly; the second bearing is an angular contact ball bearing, and the first bearing and the third bearing are both cylindrical roller bearings. The utility model flexibly combines different types of bearings, wherein the angular contact ball bearing can bear radial load and axial load at the same time, and the cylindrical roller bearing has large radial bearing capacity and can bear heavy load and impact load, thereby greatly improving the rigidity of the main shaft and meeting the heavy-load cutting requirements of large torque and large power.

Description

High-rigidity lathe spindle

Technical Field

The utility model relates to the technical field of machining equipment, in particular to a high-rigidity lathe spindle.

Background

The heavy-duty cutting is to cut large parts with rough surfaces by adopting a great cutting depth, and because the workpiece under the heavy-duty cutting working condition has high hardness, large cutting allowance, long cutting time and high workpiece value, the cutting tool is required to have high-temperature red hardness and wear resistance and also have strong impact toughness to bear the impact in the rough surface turning process. The spindle, as a core component for connecting the cutting tool and the cutting machine tool, plays a very critical role in whether heavy-duty cutting can be achieved.

The spindle of the existing cutting machine tool usually adopts a single type of bearing, such as only a cylindrical roller bearing or only an angular contact ball bearing, so that the spindle cannot simultaneously bear loads from the axial direction and the radial direction, and the cutting machine tool cannot meet the high rigidity requirement of heavy-load cutting.

Therefore, the high-rigidity lathe spindle with the improved structure is provided.

SUMMERY OF THE UTILITY MODEL

The utility model provides a high-rigidity lathe spindle, and mainly aims to solve the problems in the prior art.

The utility model adopts the following technical scheme:

a high-rigidity lathe spindle comprises a shell, a spindle, a first bearing, a second bearing, a third bearing, a first pre-tightening component and a second pre-tightening component; the main shaft is arranged in the shell, and a bearing cavity is formed between the main shaft and the shell; the first bearing and the second bearing are arranged at the front end of the bearing cavity in parallel through a first pre-tightening assembly; the third bearing is arranged at the rear end of the bearing cavity through a second pre-tightening assembly; the second bearing is an angular contact ball bearing, and the first bearing and the third bearing are both cylindrical roller bearings.

Further, the second bearing is a double-row angular contact ball bearing, and the first bearing and the third bearing are double-row cylindrical roller bearings.

Further, the first pre-tightening assembly comprises a front end cover, a front nesting sleeve, a first washer and a first locking nut; the front end cover is sleeved at the front end of the main shaft, the front nesting is arranged between the front end cover and the shell, and the rear side of the front nesting is abutted to the first bearing; the first gasket is arranged between the front nesting sleeve and the main shaft; the first lock nut abuts against the rear side of the second bearing.

Further, a first seal labyrinth is arranged between the front nesting and the first gasket; a second seal labyrinth is arranged between the front nesting and the front end cover, and the front end cover is provided with a plurality of water outlet holes communicated with the second seal labyrinth.

Still further, still include the bearing spacer that sets up between first bearing and second bearing.

Further, the second pre-tightening assembly comprises a second locking nut, a second washer, a rear end cover, a third washer and a third locking nut; the second locking nut is arranged at the front end of the third bearing, and the second washer is arranged between the second locking nut and the third bearing; the rear end cover is abutted to the shell and the rear side of the third bearing through the third locking nut, and the third washer is arranged between the rear end cover and the main shaft.

Further, a third seal labyrinth is arranged between the rear end cover and the third gasket.

Still further, the casing all is equipped with one at first lock nut and second lock nut's the corresponding position and steps down the hole to for should stepping down the hole and set a sealed lid.

Compared with the prior art, the utility model has the beneficial effects that:

the high-rigidity lathe spindle flexibly combines different types of bearings, wherein the angular contact ball bearing can bear radial load and axial load at the same time, and the cylindrical roller bearing has large radial bearing capacity and can bear heavy load and impact load, so that the rigidity of the spindle can be greatly improved, and the heavy-load cutting requirements of large torque and high power can be met.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is an enlarged schematic view of a portion B in fig. 2.

In the figure: 1. a housing; 10. a bearing cavity; 11. a hole of abdication; 12. a sealing cover; 2. a main shaft; 3. a first bearing; 4. a second bearing; 5. a third bearing; 61. a front end cover; 611. a water outlet hole; 62. front nesting; 63. a first gasket; 64. a first lock nut; 65. a bearing spacer; 601. a first seal labyrinth; 602. a second seal labyrinth; 71. a second lock nut; 72. a second gasket; 73. a rear end cap; 74. a third gasket; 75. a third lock nut; 701. a third seal labyrinth; 8. and a synchronizing wheel.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details.

As shown in fig. 1 and fig. 2, a high-rigidity lathe spindle comprises a housing 1, a spindle 2, a first bearing 3, a second bearing 4, a third bearing 5, a first pre-tightening assembly and a second pre-tightening assembly; the main shaft 2 is arranged in the shell 1, and a bearing cavity 10 is arranged between the main shaft 2 and the shell 1; the first bearing 3 and the second bearing 4 are arranged at the front end of the bearing cavity 10 in parallel through a first pre-tightening assembly; the third bearing 5 is arranged at the rear end of the bearing cavity 10 through a second pre-tightening component; the second bearing 4 is an angular contact ball bearing, and the first bearing 3 and the third bearing 5 are both cylindrical roller bearings. The utility model flexibly combines different types of bearings, wherein the angular contact ball bearing can bear radial load and axial load at the same time, and the cylindrical roller bearing has large radial bearing capacity and can bear heavy load and impact load, thereby greatly improving the rigidity of the main shaft and meeting the heavy-load cutting requirements of large torque and large power.

As shown in fig. 2 and 3, as a preferred embodiment: the second bearing 4 is a double-row angular contact ball bearing, and the first bearing 3 and the third bearing 5 are double-row cylindrical roller bearings. The double-row angular contact ball bearing occupies a small axial space, can provide a bearing configuration with higher rigidity, and can bear overturning moment. The double-row cylindrical roller bearing has the advantages of compact structure, high rigidity, high bearing capacity, small size after being loaded and the like, and is particularly suitable for supporting a main shaft of a machine tool.

As shown in fig. 1 to 3, the first pretensioning assembly comprises a front end cap 61, a front nest 62, a first washer 63 and a first locknut 64; the front end cover 61 is sleeved at the front end of the main shaft 2, the front nesting sleeve 62 is arranged between the front end cover 61 and the shell 1, and the rear side of the front nesting sleeve 62 is abutted with the first bearing 3. A first washer 63 is arranged between the front nest 62 and the main shaft 2; the first lock nut 64 abuts on the rear side of the second bearing 4. The design makes the installation of first bearing 3 and second bearing 4 more firm reliable, provides the basic condition for the lathe realizes the heavy load cutting.

As shown in fig. 2 and 3, the front nest 62 and the first gasket 63 have a first seal labyrinth 601 therebetween; a second seal labyrinth 602 is provided between the front nest 62 and the front end cover 61. The provision of the first seal labyrinth 601 and the second seal labyrinth 602 effectively improves the mechanical sealing performance of the main shaft 1. The front end cover 61 is provided with a plurality of water outlet holes 611 communicated with the second seal labyrinth 602, and when a workpiece is machined, the cutting fluid in the bearing cavity 10 can be thrown out of the water outlet holes 611 under the action of centrifugal force, so that the service life of the spindle 2 is prolonged.

As shown in fig. 2 and 3, a bearing spacer 65 is provided between the first bearing 3 and the second bearing 4 in order to prevent mutual wear between the two bearings.

As shown in fig. 2 and 4, the second pretensioning assembly comprises a second lock nut 71, a second washer 72, a rear end cap 73, a third washer 74 and a third lock nut 75; the second lock nut 71 is disposed at the front end of the third bearing 5, and a second washer 72 is disposed between the second lock nut 71 and the third bearing 5; the rear cover 73 abuts against the rear sides of the housing 1 and the third bearing 5 via a third lock nut 75, and a third washer 74 is provided between the rear cover 73 and the spindle 2. A third seal labyrinth 701 is provided between the rear end cover 73 and the third gasket 74. Similarly, the second pre-tightening assembly is arranged to improve the stability and reliability of the main shaft structure, and improve the mechanical sealing performance of the main shaft 2 to prevent particles from entering the main shaft 2.

As shown in fig. 1 and 2, the housing 1 is provided with a relief hole 11 at a corresponding position of each of the first and

second lock nuts

64 and 71, and a seal cover 12 is provided for the relief hole 11. The locking state of the first locking nut 64 and the second locking nut 71 can be observed or adjusted through the abdicating hole 11 by opening the sealing cover 12, and the operation is simple and convenient.

As shown in fig. 2, the outer sidewall of the main shaft 2 is gradually contracted from the front end to the rear end thereof, whereby the installation of the first, second and

third lock nuts

64, 71 and 75 can be facilitated.

As shown in fig. 2 to 4, in order to further improve the sealing performance, O-ring seals (not shown) may be added at key positions between the front end cover 61 and the front nest 62, between the front nest 62 and the first gasket 63, and the like.

As shown in fig. 1 and 2, the rear end of the main shaft 2 extends to the outside of the housing 1 and is provided with a synchronizing wheel 8, and when a workpiece is machined, the main shaft motor is connected to the main shaft 2 through a synchronous belt and the synchronizing wheel 8 in a transmission manner, so that the main shaft 2 is driven to rotate.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims

1. A high rigidity lathe main shaft which is characterized in that: the device comprises a shell, a main shaft, a first bearing, a second bearing, a third bearing, a first pre-tightening assembly and a second pre-tightening assembly; the main shaft is arranged in the shell, and a bearing cavity is formed between the main shaft and the shell; the first bearing and the second bearing are arranged at the front end of the bearing cavity in parallel through a first pre-tightening assembly; the third bearing is arranged at the rear end of the bearing cavity through a second pre-tightening assembly; the second bearing is an angular contact ball bearing, and the first bearing and the third bearing are both cylindrical roller bearings; the first pre-tightening assembly comprises a front end cover, a front nesting sleeve, a first washer and a first locking nut; the front end cover is sleeved at the front end of the main shaft, the front nesting is arranged between the front end cover and the shell, and the rear side of the front nesting is abutted to the first bearing; the first gasket is arranged between the front nesting sleeve and the main shaft; the first lock nut abuts against the rear side of the second bearing.

2. A high rigidity lathe spindle according to claim 1, wherein: the second bearing is a double-row angular contact ball bearing, and the first bearing and the third bearing are double-row cylindrical roller bearings.

3. A high rigidity lathe spindle according to claim 1, wherein: a first seal labyrinth is arranged between the front nesting and the first gasket; a second seal labyrinth is arranged between the front nesting and the front end cover, and the front end cover is provided with a plurality of water outlet holes communicated with the second seal labyrinth.

4. A high rigidity lathe spindle according to claim 1, wherein: the bearing spacer bush is arranged between the first bearing and the second bearing.

5. A high rigidity lathe spindle according to claim 1, wherein: the second pre-tightening assembly comprises a second locking nut, a second washer, a rear end cover, a third washer and a third locking nut; the second locking nut is arranged at the front end of the third bearing, and the second washer is arranged between the second locking nut and the third bearing; the rear end cover is abutted to the shell and the rear side of the third bearing through the third locking nut, and the third washer is arranged between the rear end cover and the main shaft.

6. The high rigidity lathe spindle according to claim 5, wherein: and a third seal labyrinth is arranged between the rear end cover and the third gasket.

7. The high rigidity lathe spindle according to claim 5, wherein: the casing all is equipped with one at first lock nut and second lock nut's the corresponding position and steps down the hole to set a sealed lid for this hole of stepping down.