CN203610980U

CN203610980U - High-precision zero-clearance transmission numerical control rotary table

Info

Publication number: CN203610980U
Application number: CN201320835949.4U
Authority: CN
Inventors: 周永林
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2014-05-28
Anticipated expiration: 2023-12-18

Abstract

The utility model provides a high-precision zero-clearance transmission numerical control rotary table. The high-precision zero-clearance transmission numerical control rotary table comprises a body, a servo motor and a working table. A spindle is coaxially arranged on the working table, the upper end and the lower end of the spindle are provided with an upper gland and a lower gland respectively, a bearing A is arranged between the upper gland and the working table, a bearing B is arranged between the lower gland and the body, a worm wheel is arranged on the spindle and meshed with a worm, an eccentric bushing is arranged in a worm hole of the body, the two ends of the eccentric bushing are fixed through a gland A and a gland B, the worm is axially fixed into the eccentric bushing through an angular contact bearing A and an angular contact bearing B at the two ends of the worm, the gland A and the gland B are provided with a left rotating torsion spring and a right rotating torsion spring respectively, a bevel gear A and an adjusting nut are arranged at one end of the worm, the bevel gear A is meshed with a bevel gear B at the shaft end of the servo motor, and a compression spring is arranged between the bevel gear A and the gland B. Various accumulated errors caused by meshing clearances of two main transmission systems in the machining process can be eliminated by adjusting mechanisms , and therefore precision of products is high, quality of the products is stable, and production cost is lowered.

Description

A kind of high accuracy gapless driving numerical control rotating platform

Technical field

The utility model relates to machine tool accessories field, relates in particular to a kind of high accuracy gapless driving numerical control rotating platform.

Background technology

Numerical control rotating platform is a relatively more outstanding product of development in machine tool accessories industry, be called as the 4th axle of lathe, accurate equipment again, senior technology again, the part processing always has the error of certain limit, and this error can cause the gap in machine driving, add the wearing and tearing in transmission process, the overall precision of equipment is declined.In order to delay the decline cycle of equipment precision, will eliminate by every means this gap, the gap mode that disappears generally adopting is at present double pitch worm worm gear, each transverse tooth thickness of a worm screw is all different, the gap of eliminating worm gear by adjusting the axial distance of worm screw, the transverse tooth thickness of the worm gear first engaging with this worm with variable tooth thickness equates, the a pair of like this worm gear being meshed, from the angle of microcosmic, only has a line contact, even if eliminated at first the gap of engagement, also very quick-wearing produces new gap, make the transmission accuracy of equipment extremely unstable, repetition indexing accuracy is changeable.Secondly, the servomotor of input and the interface mode of worm screw adopt straight-tooth transmission, and the gap of straight-tooth transmission cannot be eliminated, and is subject to the impact of gear and the basic part accuracy of manufacture, and various cumulative errors differ Product Precision of producing etc.

Utility model content

The utility model provides a kind of high accuracy gapless driving numerical control rotating platform in order to address the above problem.

The technical solution of the utility model is achieved in that a kind of high accuracy gapless driving numerical control rotating platform, comprise body, servomotor, workbench, on workbench, be coaxially provided with main shaft, the upper and lower two ends of main shaft are respectively equipped with upper press cover and lower cover, between upper press cover and workbench, be provided with bearing A, between lower cover and body, be provided with bearing B, main shaft is provided with worm gear, worm gear is meshed with worm screw, in the worm hole of body, be provided with eccentric bushing, eccentric bushing two ends are fixed by gland A and gland B, worm screw is axially fixed in eccentric bushing by angular contact bearing A and the angular contact bearing B at two ends, on gland A and gland B, be respectively equipped with left-handed torsion spring and dextrorotation torsion spring, worm screw one end is provided with bevel gear A and adjusting nut, bevel gear A engages with the bevel gear B of servomotor axle head, between bevel gear A and gland B, be provided with stage clip,

Body is provided with locking device B, and locking device B is in order to pin eccentric bushing radial position, and bevel gear A is provided with locking device A, in order to pin the axial location of bevel gear A.

The good effect of the utility model compared with background technology is: the utility model is eliminated the back lash of worm gear by the eccentric distance of eccentric sleeves, utilize the bevel gear on worm screw to engage with the bevel gear of servomotor, in order to eliminate the back lash of bevel gear, the various cumulative errors in processing all can be eliminated by the adjustment of mechanism in the back lash of two main transmissions, Product Precision is high, steady quality, dependable performance, reduce production cost, improved the service life of product.

Accompanying drawing explanation:

Fig. 1 is external view of the present utility model;

Fig. 2 is lateral plan of the present utility model;

Fig. 3 is A-A cross section view of the present utility model;

Fig. 4 is B-B cross section view of the present utility model;

Fig. 5 is the end face view of the utility model A-A profile.

Part explanation: 1. body, 2. servomotor, 3. workbench, 4, left-handed torsion spring, 5 gland A, 6. angular contact bearing A, 7. eccentric bushing, 8. worm screw, 9. worm gear, 10. main shaft, 11. angular contact bearing B, 12. gland B, 13. dextrorotation torsion springs, 14. stage clips, 15. locking device A, 16. bevel gear A, 17. adjusting nuts, 18. bevel gear B, 19. bearing A, 20. upper press covers, 21. bearing B, 22. lower covers, 23. locking device B.

The specific embodiment:

Below in conjunction with accompanying drawing, preferred embodiment of the utility model is elaborated:

A kind of high accuracy gapless driving numerical control rotating platform, mainly by body 1, workbench 3, main shaft 10 compositions such as grade, eccentric bushing 7 is located at two ends in the worm hole of body 1 and fixes, gland A5 and gland B12, worm screw 8 is axially fixed in eccentric bushing 7 by angular contact bearing A6 and the angular contact bearing B11 at two ends, on the end cylinder of gland A5 and gland B12, be respectively equipped with left-handed torsion spring 4 and dextrorotation torsion spring 13, automatically adjust the radial distance of worm gear and worm screw by eccentric bushing 7, eliminate worm gear 9 and the radially object of back lash of worm screw 8 thereby reach, reach after perfect condition, be used for pinning the radial position of eccentric bushing 7 with locking device B23, one end key that bevel gear A16 is located at worm screw 8 is slidably connected, engage with the bevel gear B18 that is fixed on servomotor 2 axle heads, stage clip 14 one end withstand on gland B12, the other end withstands on the rear end face of bevel gear A16, so as to the back lash of automatic elimination bevel gear, and adjust by adjusting nut 17, make the back lash of input reach perfect condition, be adjusted to the axial location that pins bevel gear A16 after perfect condition with locking device A15, worm gear 9 is fixed on the middle part of main shaft 10, the upper end of main shaft 10 is fixedly connected with workbench 3, and upper press cover 20 is fixed on body 1, and bearing A19 is arranged between workbench 3 and upper press cover 20, bearing B21 is arranged between body 1 and lower cover 22, guarantees that integral-rotation is flexible.

Worm screw in worm gear axial restraint in eccentric bushing, by the eccentric distance of eccentric sleeves, eliminate the back lash of worm gear, this gap mode that disappears does not change the engagement of worm gear, contact area is still constant, thereby its normal service life and transmitting torque remain unchanged, even, along with after the break-in of thick level, its engagement can be better, worm gear is connected on main shaft, main shaft is coaxially connected with workbench, the input of worm screw is that servomotor engages with the bevel gear of worm shaft end by bevel gear, its axial location of bevel gear on worm screw can be adjusted, in order to eliminate the back lash of bevel gear, like this, the various cumulative errors in processing all can be eliminated by the adjustment of mechanism in the back lash of two main transmissions, reach optimal engagement, thereby can guarantee with common manufacturing process, produce high-precision product, senior manufacturing process, produce top product, meet the various different demands in market.

Claims

1. a high accuracy gapless driving numerical control rotating platform, comprise body (1), servomotor (2), workbench (3), on workbench (3), be coaxially provided with main shaft (10), the upper and lower two ends of main shaft (10) are respectively equipped with upper press cover (20) and lower cover (22), between upper press cover (20) and workbench (3), be provided with bearing A(19), between lower cover (22) and body (1), be provided with bearing B(21), main shaft (10) is provided with worm gear (9), worm gear (9) is meshed with worm screw (8), it is characterized in that being provided with eccentric bushing (7) in the worm hole of body (1), eccentric bushing (7) two ends are by gland A(5) and gland B(12) fixing, worm screw (8) is by the angular contact bearing A(6 at two ends) and angular contact bearing B(11) be axially fixed in eccentric bushing (7), gland A(5) and gland B(12) on be respectively equipped with left-handed torsion spring (4) and dextrorotation torsion spring (13), worm screw (8) one end is provided with bevel gear A(16) and adjusting nut (17), bevel gear A(16) with the bevel gear B(18 of servomotor (2) axle head) engage, bevel gear A(16) and gland B(12) between be provided with stage clip (14).

2. a kind of high accuracy gapless driving numerical control rotating platform according to claim 1, it is characterized in that body (1) is provided with locking device B(23), locking device B(23) in order to pin eccentric bushing (7) radial position, bevel gear A(16) be provided with locking device A(15), in order to pin bevel gear A(16) axial location.