CN114083397B

CN114083397B - Anti-interference precision transmission device of aircraft engine blade grinding and trimming shaft

Info

Publication number: CN114083397B
Application number: CN202111229602.0A
Authority: CN
Inventors: 吴行飞; 吕桂芳; 邓崛华; 邓光亚; 宋援朝; 陈秀林
Original assignee: Beijing Prosper Precision Machine Tool Co ltd
Current assignee: Beijing Prosper Precision Machine Tool Co ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2022-05-13
Anticipated expiration: 2041-10-21
Also published as: CN114083397A

Abstract

The application relates to an anti-interference precision transmission device of an aircraft engine blade grinding and trimming shaft, which belongs to the technical field of machining and comprises a machine shell and a main shaft, wherein one end of the main shaft extends out of the machine shell, one end of the main shaft extending out of the machine shell is provided with a first belt pulley, and a damping component is arranged between the first belt pulley and the main shaft; the damping assembly comprises a shaft sleeve and a first bearing, the shaft sleeve is sleeved with the main shaft and fixed with the shell, the first bearing is sleeved with the shaft sleeve, a first limiting ring is fixed on the inner wall of the first belt pulley, and the first bearing is abutted against the first limiting ring by the outer ring of the bearing close to the shell; one side that the axle sleeve was kept away from the casing is provided with the end cover, and the end cover includes first end cover and the second end cover fixed with first end cover, and the second end cover is fixed with the main shaft with the one end of main shaft, first end cover with first belt pulley is fixed, is connected with on the first end cover to keep away from one side of casing to first bearing and carries out spacing subassembly. The vibration reduction device has the effect of reducing the vibration condition of the main shaft in the rotating process.

Description

Anti-interference precision transmission device of aircraft engine blade grinding and trimming shaft

Technical Field

The application relates to the technical field of machining, in particular to an anti-interference precise transmission device for an aircraft engine blade grinding and trimming shaft.

Background

In the technical field of aerospace, the blade of an aero-engine plays an important role. The aviation blades are various in types, different in size and complex in curved surface shape, and the machining precision of the aviation blades plays a vital role in the performance and the operation safety of an aviation engine.

The main shaft of the grinding machine of the blade of the aircraft engine generally adopts a transmission mode of a belt and a belt pulley, and the main shaft is driven by the belt pulley. When the belt drives the belt pulley to rotate, the belt is easy to vibrate, the vibration of the belt can be transmitted to the main shaft, so that the main shaft can vibrate in the rotating process, and the precision of a processed workpiece is reduced.

Disclosure of Invention

In order to reduce the main shaft and rotate in-process vibration condition, the application provides an anti-interference precision transmission of aeroengine blade grinding trimming shaft.

The application provides a pair of anti-interference precision transmission of aeroengine blade grinding finishing shaft adopts following technical scheme:

an anti-interference precision transmission device of an aircraft engine blade grinding and trimming shaft comprises a machine shell and a main shaft, wherein one end of the main shaft extends out of the machine shell, a first belt pulley is arranged at one end of the main shaft extending out of the machine shell, and a damping assembly is arranged between the first belt pulley and the main shaft;

the damping assembly comprises a shaft sleeve and a first bearing, the damping assembly comprises a machine shell and a main shaft, the shaft sleeve is sleeved with the main shaft, a gap exists between the inner wall of the shaft sleeve and the outer wall of the main shaft, a plurality of first screws are arranged on the shaft sleeve, the shaft sleeve is fixed with the machine shell through the first screws, the first bearing is sleeved with the shaft sleeve, a limiting groove is formed in the outer wall, in contact with the first bearing, of the shaft sleeve, a bearing inner ring, close to the machine shell, of the first bearing is abutted against the groove wall of the limiting groove, a first limiting ring is fixed on the inner wall of the first belt pulley, and a bearing outer ring, close to the machine shell, of the first bearing is abutted against the first limiting ring;

the shaft sleeve is kept away from one side of casing is provided with the end cover, the end cover includes first end cover and the second end cover fixed with first end cover, be provided with the second screw on the second end cover, the second end cover with the one end butt of main shaft is fixed with the main shaft through the second screw, the second end cover with be provided with first cushion between the main shaft, first end cover is located one side that the casing was kept away from to first belt pulley, first end cover with first belt pulley is fixed, be connected with on the first end cover and keep away from first bearing one side of casing carries out spacing subassembly.

Through adopting above-mentioned technical scheme, when first belt pulley drives the main shaft and rotates, first belt pulley drives first end cover and second end cover and rotates, the second end cover moves the main shaft and rotates, set up damper between main shaft and the first belt pulley, there is the clearance between the inner wall of axle sleeve and the outer wall of main shaft, when first belt pulley rotates, axle sleeve and first bearing transmit the vibration reduction of first belt pulley transmission for the main shaft, thereby reduce the main shaft and rotate the in-process vibration condition, the machining precision of main shaft has been increased. Offer on the axle sleeve and carry out spacing groove to first bearing, be fixed with on the first belt pulley and carry out spacing first spacing ring to first bearing, be connected with on the first end cover and carry out spacing subassembly to one side that the casing was kept away from to first bearing, first bearing is spacing by spacing subassembly, spacing groove and first spacing ring, has increased the stability of first bearing to reduce the vibration condition that first belt pulley produced.

Optionally, the limiting assembly includes a first blocking ring and a first connecting ring, the first connecting ring is located between the first belt pulley and the first end cover and is sleeved with the second end cover, a second connecting ring is fixed on the outer wall of the first end cover, a plurality of third screws are evenly arranged on the second connecting ring, the third screws penetrate through the second connecting ring and the first connecting ring and are in threaded connection with the first belt pulley, the first blocking ring is fixed at one end of the first connecting ring, which is far away from the first end cover, one end of the first blocking ring, which is far away from the first connecting ring, is abutted to the outer ring of the first bearing.

Through adopting above-mentioned technical scheme, the one end that first fender ring kept away from first connecting ring is spacing to first bearing, has increased the stability of first bearing. The second connecting ring, the first connecting ring and the first belt pulley are fixed by the third bolt, and after the second connecting ring, the first retaining ring and the first belt pulley are fixed, the first retaining ring is abutted to the first bearing. When the first belt pulley rotates to generate vibration, the first connecting ring can reduce the vibration transmitted to the end cover by the first belt pulley, so that the vibration transmitted to the main shaft by the end cover is reduced.

Optionally, a third connection ring is fixed to one side of the shaft sleeve close to the second end cover, an outer wall of the third connection ring protrudes out of an outer wall of the shaft sleeve close to the second end cover, and one side of the third connection ring away from the second end cover abuts against the inner ring of the first bearing.

By adopting the technical scheme, one side of the third connecting ring, which is far away from the second end cover, abuts against the inner ring of the first bearing, so that the stability of the first bearing is improved, and the vibration of the first belt pulley is reduced.

Optionally, a plurality of second connecting holes are formed in the second connecting ring, each third screw corresponds to one second connecting hole, each connecting column made of rubber materials is arranged in each second connecting hole, the connecting column is far away from the end face of one end of the first belt pulley and the end face of the second connecting ring far away from the first belt pulley, one end of the connecting column far away from the first belt pulley is provided with a connecting plate, the connecting plate is abutted to the second connecting ring, one end of the connecting column, close to the first belt pulley, is abutted to the first connecting ring, and the second screws penetrate through the connecting plate and the connecting column.

Through adopting above-mentioned technical scheme, the third screw runs through connecting plate, spliced pole, first go-between and with first belt pulley threaded connection, the spliced pole is close to the one end and the first go-between butt of first belt pulley, and the spliced pole can reduce the vibration that first go-between was given to the second go-between to the vibration that makes end cover and main shaft reduces.

Optionally, a second elastic pad is connected between the first connecting ring and the first pulley.

Through adopting above-mentioned technical scheme, with first connecting ring and first belt pulley fixed back, the cushion clip is between first connecting ring and first belt pulley, and the second cushion has reduced first belt pulley and has gone out the vibration that transmits for first connecting ring to the vibration that makes end cover and main shaft reduces.

Optionally, a second mounting groove is formed in the inner wall, away from the casing, of the first shaft sleeve, a second bearing is arranged in the second mounting groove, an inner ring of the second bearing is in contact with the outer wall of the main shaft, one end, close to the casing, of a bearing outer ring of the second bearing is abutted against the groove wall, close to the casing, of the second mounting groove, a second limiting ring is fixed on the inner wall of the third connecting ring, and one end, close to the casing, of the second limiting ring is abutted against the bearing outer ring, away from the casing, of the second bearing.

Through adopting above-mentioned technical scheme, be provided with the second bearing that cup joints with the main shaft in the second mounting groove, the second bearing has increased the stability that the main shaft is close to end cover one end to the stability when the main shaft rotates has been increased in the messenger.

Optionally, an insert ring is fixed at one end of the first belt pulley, which is close to the housing, and a slot for inserting the insert ring is formed in the shaft sleeve.

Through adopting above-mentioned technical scheme, insert the ring and insert in the slot, insert the ring and can be at the slot internal rotation, insert the stability when the ring can increase first belt pulley and rotate.

Optionally, a mounting ring is fixed to one side, close to the casing, of the shaft sleeve, a first mounting groove is formed in the outer wall, close to the shaft sleeve, of the casing, and the mounting ring is connected with the first mounting groove in an inserting mode.

Through adopting above-mentioned technical scheme, when the axle sleeve is installed, peg graft with the first mounting groove on the collar of axle sleeve and the casing earlier, be convenient for install the axle sleeve.

In summary, the present application includes at least one of the following beneficial technical effects:

1. a gap is formed between the inner wall of the shaft sleeve and the outer wall of the main shaft, and when the first belt pulley rotates, the shaft sleeve and the first bearing reduce the vibration transmitted to the main shaft by the first belt pulley, so that the vibration condition of the main shaft in the rotating process is reduced, and the machining precision of the main shaft is improved;

2. the second elastic cushion reduces the vibration transmitted from the first belt pulley to the first connecting ring, so that the vibration of the end cover and the main shaft is reduced;

3. and a second bearing sleeved with the main shaft is arranged in the second mounting groove, and the second bearing increases the stability of the main shaft close to one end of the end cover, so that the stability of the main shaft during rotation is increased.

Drawings

Fig. 1 is a schematic structural view embodying the entirety of the present application.

Figure 2 is a schematic view of a shock absorbing assembly and a spacing assembly embodying the present application.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Description of reference numerals: 1. a main shaft; 2. a housing; 21. a first mounting groove; 22. a support block; 3. a drive assembly; 31. a first pulley; 311. a first limit ring; 312. inserting a ring; 32. a second pulley; 33. a belt; 34. a motor; 4. a shock absorbing assembly; 41. a shaft sleeve; 411. a first bushing; 4111. a limiting groove; 412. a second shaft sleeve; 413. a third shaft sleeve; 4131. a first screw; 4132. a mounting ring; 4133. a slot; 42. a first bearing; 5. an end cap; 51. a first end cap; 511. a second connection ring; 512. a third screw; 52. a second end cap; 521. a first connection hole; 522. a second screw; 523. a first elastic pad; 6. a limiting component; 61. a first retainer ring; 62. a first connecting ring; 621. a second elastic pad; 7. a second connection hole; 71. connecting columns; 72. a connecting plate; 8. a third connecting ring; 9. a second mounting groove; 91. a second bearing; 92. and a second limit ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses anti-interference precision transmission device of aircraft engine blade grinding and trimming shaft. Referring to fig. 1 and 2, the anti-interference precision transmission device for the grinding and trimming shaft of the blade of the aircraft engine comprises a main shaft 1 and a casing 2, a supporting block 22 is fixed below the casing 2, a bearing is arranged in the casing 2, the bearing is sleeved with the main shaft 1, one end of the main shaft 1 extends out of the casing 2, and a driving component 3 for driving the main shaft 1 to rotate is arranged on one side of the casing 2. A damping assembly 4 is arranged between the driving assembly 3 and the main shaft 1.

The damping assembly 4 comprises a shaft sleeve 41 and a first bearing 42, the shaft sleeve 41 is sleeved with the spindle 1, the shaft sleeve 41 comprises a first shaft sleeve 411, a second shaft sleeve 412 and a third shaft sleeve 413, the second shaft sleeve 412 is fixed with the outer wall of the first shaft sleeve 411, one end, close to the casing 2, of the second shaft sleeve 412 protrudes out of the first shaft sleeve 411, and one end, far away from the first shaft sleeve 411, of the second shaft sleeve 412 is in contact with one end of the casing 2. The third shaft sleeve 413 is fixed to the outer wall of the second shaft sleeve 412, and one end of the third shaft sleeve 413 close to the casing 2 is flush with one end of the second shaft sleeve 412 close to the casing 2.

The third sleeve 413 is provided with a plurality of first screws 4131, the plurality of first screws 4131 are uniformly arranged along the axis of the third sleeve 413, and the first screws 4131 penetrate through the third sleeve 413 and are in threaded connection with the casing 2. One side that third axle sleeve 413 is close to casing 2 is fixed with collar 4132, and casing 2 has seted up first mounting groove 21 on being close to the outer wall of third axle sleeve 413 one end, and collar 4132 is pegged graft with first mounting groove 21 and is cooperated, conveniently installs axle sleeve 41 on casing 2.

Referring to fig. 2, the driving assembly 3 includes a first belt pulley 31, the first belt pulley 31 is sleeved with a first bearing 42, a first limit ring 311 is fixed on an inner wall of the first belt pulley 31, a limit groove 4111 is formed on an outer wall of the first shaft sleeve 411, one end of an inner ring of the first bearing 42 abuts against a groove wall of the limit groove 4111 close to the casing 2, and one end of an outer ring of the first bearing 42 abuts against one end of the first limit ring 311 away from the casing 2.

The end cover 5 is arranged at one end of the first shaft sleeve 411 far away from the machine shell 2, the end cover 5 comprises a first end cover 51 and a second end cover 52 fixed with the first end cover 51, the inner wall of the first end cover 51 is fixed with the outer wall of the second end cover 52, and one end of the second end cover 52 far away from the first end cover 51 is abutted to one end of the main shaft 1. A plurality of first connecting holes 521 are uniformly formed in the second end cover 52, a second screw 522 is disposed in each first connecting hole 521, and the second screw 522 penetrates through the first connecting hole 521 and is in threaded connection with the spindle 1, so that the second end cover 52 is fixed to the spindle 1.

Referring to fig. 2 and 3, a first elastic pad 523 is disposed between the second end cover 52 and the main shaft 1, and the first elastic pad 523 is made of rubber. The first elastic pad 523 can reduce the vibration to which the main shaft 1 is subjected.

One side that casing 2 was kept away from to first bearing 42 is provided with spacing subassembly 6, spacing subassembly 6 includes first fender ring 61 and first connecting ring 62, first connecting ring 62 is located between first end cover 51 and the first belt pulley 31, first connecting ring 62 cup joints with second end cover 52, first fender ring 61 is fixed in the one end that first connecting ring 62 is close to casing 2, the bearing outer lane butt that first fender ring 61 kept away from the one end of first connecting ring 62 and first bearing 42 are close to first end cover 51.

A second connection ring 511 is fixed to an outer wall of the first end cap 51, a plurality of third screws 512 are provided on the second connection ring 511, and the third screws 512 penetrate the second connection ring 511 and the first connection ring 62 and are threadedly coupled with the first pulley 31, thereby fixing the second connection ring 511, the first connection ring 62 and the first pulley 31, and thus the first end cap 51 is fixed with the first pulley 31.

The second connecting ring 511 is provided with a plurality of second connecting holes 7, the plurality of second connecting holes 7 are uniformly arranged along the axis of the second connecting ring 511, each second connecting hole 7 is internally provided with a connecting column 71, the center of the connecting column 71 is provided with a jack for the third screw 512 to pass through, and the connecting column 71 is made of rubber. One end of the connection post 71 away from the first pulley 31 is flush with one end of the second connection ring 511 away from the first pulley 31, and the other end of the connection post 71 protrudes out of the second connection ring 511 and abuts against the first connection ring 62.

The connecting column 71 is provided with a connecting plate 72 on the side away from the first connecting ring 62, the connecting plate 72 is abutted against one end of the second connecting ring 511 away from the first connecting ring 62, and a third screw 512 penetrates through the connecting plate 72. The connecting column 71 reduces the vibration transmitted by the first pulley 31 to the end cap 5, thereby increasing the stability of the rotation of the main shaft 1.

Referring to fig. 1 and 2, a second pulley 32 is disposed below the first pulley 31, the first pulley 31 and the second pulley 32 are connected by a belt 33, and a motor 34 for driving the second pulley 32 to rotate is fixed on the ground. When the main shaft 1 needs to be driven to rotate, the motor 34 drives the second belt pulley 32 to rotate, the second belt pulley 32 drives the first belt pulley 31 to rotate, the first belt pulley 31 drives the end cover 5 to rotate, and the end cover 5 drives the main shaft 1 to rotate.

Referring to fig. 2 and 3, a third connection ring 8 is disposed at an end of the first shaft sleeve 411 close to the first connection ring 62, the third connection ring 8 is fixed to the first shaft sleeve 411 by a screw, and an end of the third connection ring 8 close to the first shaft sleeve 411 abuts against an end of an inner ring of the first bearing 42 away from the housing 2. The third connecting ring 8 abuts against the first bearing 42 to further limit the first bearing 42, so that the possibility of shaking of the first bearing 42 is reduced.

A second elastic pad 621 is arranged between the first connecting ring 62 and the first belt pulley 31, the second elastic pad 621 is made of rubber, and after the first connecting ring 62 and the first belt pulley 31 are fixed through a first screw 4131, the first connecting ring 62 and the first belt pulley 31 clamp the second elastic pad 621 tightly. The second elastic pad 621 dampens the vibration of the first pulley 31, so that the vibration of the head cover 5 and the main shaft 1 is reduced.

An insert ring 312 is fixed at one end of the first belt pulley 31 close to the third shaft sleeve 413, a slot 4133 is formed at one side of the third shaft sleeve 413 far away from the housing 2, and the insert ring 312 is in inserted fit with the slot 4133. Inserting ring 312 into slot 4133 increases the stability of first pulley 31 during rotation of first pulley 31.

The first sleeve 411 is far away from and has been seted up second mounting groove 9 on the inner wall of casing 2, is provided with second bearing 91 in the second mounting groove 9, and second bearing 91 cup joints with main shaft 1, and the inner circle of second bearing 91 contacts with the outer lane of main shaft 1, and the one end butt that the outer lane of second bearing 91 is close to casing 2 is close to on the cell wall that second mounting groove 9 is close to casing 2. A second limiting ring 92 is fixed on the inner ring of the third connecting ring 8, and one side of the second limiting ring 92, which is far away from the third connecting ring 8, is tightly abutted against the outer ring of the second bearing 91. The second bearing 91 is arranged to make the end of the main shaft 1 close to the end cover 5 rotate more stably.

The application embodiment of the anti-interference precision transmission device of the grinding and trimming shaft of the aero-engine blade has the following implementation principles: when the main shaft 1 needs to rotate, the motor 34 drives the first belt pulley 31 to rotate, the first belt pulley 31 drives the end cover 5 to rotate, and the end cover 5 drives the main shaft 1 to rotate. A shaft sleeve 41 and a first bearing 42 are arranged between the main shaft 1 and the first belt pulley 31, the shaft sleeve 41 and the first bearing 42 reduce the vibration generated by the first belt pulley 31 in rotation, the second elastic pad 621 reduces the vibration between the first belt pulley 31 and the first connecting ring 62, and the connecting column 71 reduces the vibration between the first connecting ring 62 and the end cover 5. When the first belt pulley 31 drives the main shaft 1 to rotate, the vibration generated by the first belt pulley 31 is greatly weakened, so that the vibration condition when the main shaft 1 rotates is reduced, and the workpiece machining precision is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an anti-interference precision transmission of aeroengine blade grinding trimming shaft, includes casing (2) and main shaft (1), its characterized in that: one end of the main shaft (1) extends out of the machine shell (2), one end of the main shaft (1) extending out of the machine shell (2) is provided with a first belt pulley (31), and a damping component (4) is arranged between the first belt pulley (31) and the main shaft (1);

the damping assembly (4) comprises a shaft sleeve (41) and a first bearing (42), the shaft sleeve (41) is sleeved with the main shaft (1), a gap is formed between the inner wall of the shaft sleeve (41) and the outer wall of the main shaft (1), the shaft sleeve (41) is provided with a plurality of first screws (4131), the shaft sleeve (41) is fixed with the shell (2) through the first screws (4131), the first bearing (42) is sleeved with the shaft sleeve (41), a limit groove (4111) is formed in the outer wall of the shaft sleeve (41) which is in contact with the first bearing (42), the first bearing (42) is close to the inner ring of the bearing of the shell (2) and is abutted against the groove wall of the limit groove (4111), a first limit ring (311) is fixed on the inner wall of the first belt pulley (31), the first bearing (42) is close to the bearing outer ring of the shell (2) and is abutted against the first limiting ring (311);

an end cover (5) is arranged on one side of the shaft sleeve (41) far away from the shell (2), the end cover (5) comprises a first end cover (51) and a second end cover (52) fixed with the first end cover (51), the second end cover (52) is provided with a second screw (522), the second end cover (52) is abutted against one end of the main shaft (1) and is fixed with the main shaft (1) through the second screw (522), a first elastic pad (523) is arranged between the second end cover (52) and the main shaft (1), the first end cover (51) is positioned on one side of the first belt pulley (31) far away from the machine shell (2), first end cover (51) with first belt pulley (31) are fixed, be connected with on first end cover (51) and keep away from first bearing (42) one side of casing (2) carries out spacing subassembly (6).

2. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to claim 1, characterized in that: the limiting assembly (6) comprises a first blocking ring (61) and a first connecting ring (62), the first connecting ring (62) is located between the first belt pulley (31) and the first end cover (51) and is sleeved with the second end cover (52), a second connecting ring (511) is fixed on the outer wall of the first end cover (51), a plurality of third screws (512) are uniformly arranged on the second connecting ring (511), the third screws (512) penetrate through the second connecting ring (511) and the first connecting ring (62) and are in threaded connection with the first belt pulley (31), the first blocking ring (61) is fixed at one end, far away from the first end cover (51), of the first connecting ring (62), and one end, far away from the first connecting ring (62), of the first blocking ring (61) is abutted to the outer ring of the first bearing (42).

3. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to claim 2, characterized in that: a third connecting ring (8) is fixed on one side, close to the second end cover (52), of the shaft sleeve (41), the outer wall of the third connecting ring (8) protrudes out of the outer wall, close to the second end cover (52), of the shaft sleeve (41), and one side, far away from the second end cover (52), of the third connecting ring (8) abuts against the inner ring of the first bearing (42).

4. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to claim 2, characterized in that: a plurality of second connecting holes (7) are formed in the second connecting ring (511), each third screw (512) corresponds to one second connecting hole (7), a connecting column (71) made of rubber is arranged in each second connecting hole (7), the end surface of one end of the connecting column (71) far away from the first belt pulley (31) is flush with the end surface of the second connecting ring (511) far away from the first belt pulley (31), one end of the connecting column (71) far away from the first belt pulley (31) is provided with a connecting plate (72), the connecting plate (72) is abutted with the second connecting ring (511), one end of the connecting column (71) close to the first belt pulley (31) is abutted with the first connecting ring (62), the second screw (522) penetrates through the connecting plate (72) and the connecting column (71).

5. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to any one of claims 2 to 4, characterized in that: a second elastic pad (621) is connected between the first connecting ring (62) and the first pulley (31).

6. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to claim 3, characterized in that: the bearing is characterized in that a second mounting groove (9) is formed in the inner wall, far away from the casing (2), of the shaft sleeve (41), a second bearing (91) is arranged in the second mounting groove (9), the inner ring of the second bearing (91) is in contact with the outer wall of the main shaft (1), the outer bearing ring of the second bearing (91) is close to one end of the casing (2) and the groove wall of the casing (2) in abutting connection with the second mounting groove (9), a second limiting ring (92) is fixed on the inner wall of the third connecting ring (8), and one end, close to the casing (2), of the second limiting ring (92) abuts against the outer bearing ring, far away from the casing (2), of the second bearing (91).

7. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to claim 1, characterized in that: an inserting ring (312) is fixed at one end of the first belt pulley (31) close to the machine shell (2), and a slot (4133) for inserting the inserting ring (312) is formed in the shaft sleeve (41).

8. The anti-interference precision transmission device of the aircraft engine blade grinding and trimming shaft according to claim 7, characterized in that: an installation ring (4132) is fixed on one side, close to the casing (2), of the shaft sleeve (41), a first installation groove (21) is formed in the outer wall, close to the shaft sleeve (41), of the casing (2), and the installation ring (4132) is connected with the first installation groove (21) in an inserting mode.