Rotary feeding mechanism of numerical control rotary table

Abstract

The invention discloses a rotary feeding mechanism of a numerical control rotary table, which comprises a double worm and gear transmission structure, a sliding seat shaft hole-inner cavity-shaft hole integrated system, a belleville spring reverse clearance eliminating system and a transmission ratio and self-locking performance improving device. The double worm and gear transmission structure is adopted, so that the rotary feeding mechanism has the advantages of large transmission ratio and high transmission precision; meanwhile, the position of the feeding mechanism is compensated in real time through the belleville spring, and a reverse gap is effectively eliminated; in addition, a highly integrated structural design is adopted, a modular assembly mode is adopted, the structure is compact, installation is convenient, and the maintenance cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machine tools, in particular to a numerical control rotary table rotary feed mechanism. BACKGROUND

[0002] In the field of numerical control machine tools and precision manufacturing, as a core functional component for realizing multi-axis linkage machining, the performance of the rotary feed mechanism of the numerical control rotary table directly determines the machining precision and efficiency of complex curved surface parts (such as aircraft engine blades, precision molds, etc.). At present, the following methods are mainly used for the rotary feed mechanism: Method one: worm and gear transmission mechanism as an important solution in the field of mechanical transmission, its working principle is based on the special space meshing characteristics. The mechanism is mainly composed of a worm (similar to a screw driving part) and a worm gear (a driven part with a special tooth shape), and the motion and power transmission are realized through the 90° staggered shafts of the two. Its core advantages are reflected in two aspects: one is that a single stage can realize a large transmission ratio of 5:1 to 100:1, which is much higher than gear transmission; two is that when the lead angle is less than the friction angle (usually the transmission ratio is greater than 30:1), it has self-locking function, which can effectively prevent the load from reversing in vertical axis application, and ensure the safety of the system. However, this transmission method has obvious technical limitations. In terms of precision, due to the linear contact characteristics of worm and gear, even if the precision grinding process is used, the tooth side gap during initial assembly is still difficult to control within 0.01°. This gap will produce obvious idle stroke error when the direction of motion changes, which seriously affects the positioning accuracy. With the accumulation of running time, the tooth surface wear will further increase the transmission gap.

[0003] Method two: direct drive torque motor, this technology adopts special designed annular permanent magnet rotor and stator winding direct coupling, through electromagnetic field interaction to produce torque, completely eliminates the mechanical transmission links such as gear, worm, etc., realizes the "zero backlash" power transmission. Its core advantage lies in excellent dynamic performance: due to the elimination of the elastic deformation and gap influence of the transmission chain, the acceleration can reach , the speed response bandwidth is more than 100Hz, the positioning repeatability can reach ±1 arc second, the direct drive motor needs to use high performance neodymium iron boron permanent magnet material and precision winding process, the cost can reach 3-5 times of the traditional servo system. More importantly, the heat management problem of large torque output: when the continuous output torque exceeds 500Nm, the copper loss and iron loss will cause the winding temperature to rise at a rate of 5-8℃ per minute, if not controlled, it will exceed the heat resistance level of the insulation material in a short time. Therefore, a complex liquid cooling system must be equipped, including circulating pump, heat exchanger and temperature monitoring device, which not only increases 20%-30% of additional energy consumption, but also significantly improves the system maintenance complexity.

[0004] Method three: harmonic reducer, its unique working principle is based on the principle of harmonic transmission in elasticity. The mechanism is mainly composed of three core components: wave generator, flexible gear and rigid gear. The wave generator makes the thin-walled flexible gear produce controllable elastic deformation through the elliptical cam, and forms progressive meshing with the rigid gear, realizing a high reduction ratio of 50:1 to 160:1. This elastic deformation transmission mode has outstanding technical advantages: extremely compact structure (axial length is only 1 / 3 of the same level planetary reducer), and can realize ultra-low backlash less than or equal to 30 angular seconds, and the repeat positioning accuracy is as high as ±5 angular seconds. However, the harmonic reducer also has obvious performance limitations in engineering applications. In terms of carrying capacity, limited by the thin-walled structure of the flexible gear (usually only 0.2-0.5mm thick), its radial carrying capacity is usually not more than 5000N, and the axial carrying capacity is more limited within 2000N. More critically, the fatigue failure problem: the flexible gear is under the periodic deformation of thousands of times per minute, and the material will gradually produce fatigue cracks, and the typical service life is about 10,000-20,000 hours, which is much lower than that of the planetary reducer of the same specification.

[0005] Therefore, there is an urgent need for a numerical control rotary table rotary feed mechanism, which adopts a double worm gear transmission structure, has the advantages of large transmission ratio and high transmission precision, and simultaneously compensates the position of the feed mechanism in real time through a disc spring to effectively eliminate the reverse gap. In addition, the highly integrated structure design and modular assembly method make the structure compact, easy to install and low in maintenance cost. SUMMARY

[0006] The purpose of the present application is to provide a numerical control rotary table rotary feed mechanism, which adopts a double worm gear transmission structure, has the advantages of large transmission ratio and high transmission precision, and simultaneously compensates the position of the feed mechanism in real time through a disc spring to effectively eliminate the reverse gap. In addition, the highly integrated structure design and modular assembly method make the structure compact, easy to install and low in maintenance cost.

[0007] The technical scheme of the present application is as follows: The application discloses a numerical control rotary table rotary feeding mechanism, which comprises a double worm gear transmission structure, a slide seat shaft hole-inner cavity-shaft hole integrated system, a disc spring reverse gap elimination system and a transmission ratio and self-locking performance improving device; the double worm gear transmission structure is connected by a connecting sleeve to form double-stage transmission, the driving shaft is connected with a driving mechanism through a shaft coupling, and the driven shaft is provided with a disc spring assembly to realize real-time compensation of reverse gap; the slide seat is internally provided with an integrated structure of shaft hole-inner cavity-shaft hole, the transmission mechanism is integrally installed in the structure and fixed through a gland; the disc spring reverse gap elimination system is arranged on the driven shaft and eliminates the backlash error of the double worm gear structure when the transmission direction is switched through a spring pre-pressing mode; the transmission ratio and self-locking performance improving device realizes a large transmission ratio of 50:1 to 100:1 through the worm gear transmission characteristics, and has a self-locking function when the transmission ratio is greater than 30:1 through lead angle design, so that the reverse rotation of the workbench load is prevented.

[0008] The double worm gear transmission structure is a core transmission component, realizes power transmission through double-stage transmission and provides power basis for the rotary table; the slide seat shaft hole-inner cavity-shaft hole integration provides an overall installation space for the transmission mechanism, makes the structure compact, reduces the occupied space and facilitates installation and maintenance; the disc spring reverse gap elimination system realizes real-time compensation of the backlash error of the double worm gear structure when the transmission direction is switched through a spring pre-pressing mode, improves transmission accuracy and reduces the influence of reverse gap on the rotary accuracy of the rotary table; the transmission ratio and self-locking performance improving device realizes a large transmission ratio of 50:1 to 100:1 through the worm gear transmission characteristics, meets the requirements of the rotary table on different speeds and torques; the self-locking function is realized when the transmission ratio is greater than 30:1 through lead angle design, the reverse rotation of the workbench load is prevented and the stability of the rotary table when stopping is ensured; the driving shaft and the driven shaft are connected by a connecting sleeve to form double-stage transmission, realize the step-by-step transmission of power, obtain the required total transmission ratio through reasonable design of the two-stage transmission ratio and meet the requirements of the rotary table on speed and torque; the driving shaft is connected with a servo motor through a shaft coupling, accurately and stably transmits the rotary motion and power of the servo motor to the driving shaft, allows axial, radial and angular displacement to a certain extent, compensates for installation errors and protects the motor and transmission components; the driven shaft is provided with a disc spring assembly to realize real-time compensation of reverse gap, the disc spring assembly is arranged on the driven shaft, the elastic force of the spring can timely eliminate the gap between the gear or worm gear when the transmission direction is changed, and the continuity and accuracy of transmission are ensured.

[0009] Further, the slide workbench mechanism comprises a slide, a workbench, a rolling body, a pressing plate, a scrap plate and a clamping oil cylinder; the rolling body is installed on the bottom side of the slide and in contact with the bed rail, the pressing plate is horizontally installed to press the rolling body, the scrap plate is vertically installed in the moving direction of the slide, the clamping oil cylinder is circumferentially arranged on the top surface of the slide to realize the positioning and clamping of the workbench, the rolling body is installed on the bottom side of the slide and in contact with the bed rail, the sliding friction between the slide and the bed rail is converted into rolling friction, the friction is reduced, the abrasion is reduced, the stability and precision of the movement of the slide are improved; the pressing plate is horizontally installed to press the rolling body, which prevents the rolling body from falling off or moving during the movement, ensures the good contact between the rolling body and the slide and the bed rail, and ensures the stability of the rolling friction; the scrap plate is vertically installed in the moving direction of the slide, which scrapes the chips, dust and other impurities on the bed rail during the movement of the slide, prevents these impurities from entering between the rolling body and the rail, and affects the stability and precision of the movement, and protects the rail and the rolling body from abrasion; the clamping oil cylinder is circumferentially arranged on the top surface of the slide to realize the positioning and clamping of the workbench, after the workbench reaches the specified position, the workbench is firmly fixed on the slide through the circumferential clamping force of the clamping oil cylinder, which prevents the workbench from moving due to stress during the machining process and ensures the machining precision.

[0010] Further, the driving mechanism driving shaft adopts modular design and comprises a double-row angular contact ball bearing, a second thrust ball bearing, a driving shaft support sleeve, a tapered roller bearing and a driving shaft spacer; the support sleeve is installed in the first shaft hole, the tapered roller bearing is axially positioned with the worm through the spacer, and the end cover realizes axial pre-tightening through the driving shaft gland. The driving mechanism driving shaft adopts modular design, which facilitates the manufacturing, installation, maintenance and replacement of the driving shaft, improves the production efficiency and reduces the maintenance cost. The double-row angular contact ball bearing and the tapered roller bearing bear the radial force of the driving shaft, the second thrust ball bearing bears the axial force, the driving shaft support sleeve provides installation support for the bearing, the driving shaft spacer is used for axial positioning and adjusting the bearing gap, and the rotation accuracy and stability of the driving shaft are ensured. The support sleeve installed in the first shaft hole can provide an accurate installation position for the bearing, ensure the coaxiality of the bearing and the driving shaft, and enable the driving shaft to rotate smoothly. The tapered roller bearing is axially positioned with the worm through the spacer, which can accurately control the position of the tapered roller bearing in the axial direction, ensure the correct cooperation between the bearing and the worm, prevent axial movement, and improve the stability and precision of the transmission. The end cover realizes axial pre-tightening through the driving shaft gland, which eliminates the internal clearance of the bearing, improves the rigidity and rotation accuracy of the bearing, reduces vibration and noise, and prolongs the service life of the bearing.

[0011] Further, the transmission mechanism driven shaft is provided with a disc spring assembly, including a deep groove ball bearing, a thrust ball bearing one, a driven shaft spacer and a disc spring; the driven shaft end cover is installed in the third bearing hole, the deep groove ball bearing and the thrust ball bearing one are separately arranged at both ends of the worm, the disc spring is pre-pressed and compensated through the driven shaft spacer, the transmission mechanism driven shaft is provided with a disc spring assembly, the reverse gap is compensated in real time, and the precision and stability of the driven shaft transmission are improved; the deep groove ball bearing bears the radial force of the driven shaft, the thrust ball bearing one bears the axial force, the driven shaft spacer is used for axial positioning and adjusting the bearing gap, and the disc spring provides the elastic force required for reverse gap compensation; the driven shaft end cover is installed in the third bearing hole to provide installation support and sealing protection for the bearing, prevent dust, impurities and the like from entering the inside of the bearing, and affect the normal operation of the bearing; the deep groove ball bearing and the thrust ball bearing one are separately arranged at both ends of the worm, the radial force and the axial force borne by the driven shaft are reasonably distributed, and the stability and reliability of the worm in the transmission process are ensured; the pre-pressing force of the disc spring is accurately controlled through the driven shaft spacer, so that the gap can be timely and effectively eliminated when the transmission direction is changed, and the continuity and precision of the transmission are ensured.

[0012] Further, the feeding mechanism adopts a double gear shaft driving structure, including a driving gear shaft, a driven gear shaft, a flange plate and a large gear ring; the driving gear shaft is synchronously rotated with the turbine through key connection, is installed into the slide shaft cavity through the flange plate, the driven gear shaft realizes backlash-free transmission through inclined surface pressing connection, and the large gear ring is rigidly connected with the workbench to realize rotary motion transmission; the feeding mechanism adopts the double gear shaft driving structure, stable and accurate power transmission is realized through the cooperation of the double gear shafts, and the requirement of the rotary motion of the workbench is met; the driving gear shaft transmits power to the driven gear shaft, the driven gear shaft transmits power to the workbench through the large gear ring, the flange plate is used for connecting and fixing various components, and together constitutes a transmission system of the feeding mechanism; the driving gear shaft is synchronously rotated with the turbine through key connection, reliable connection between the driving gear shaft and the turbine is ensured, the two can be synchronously rotated, accurate power transmission is realized, the driving gear shaft is installed into the slide shaft cavity through the flange plate to provide installation space, and through the connection of the flange plate and the slide, the installation position precision and stability of the driving gear shaft are ensured; the driven gear shaft realizes backlash-free transmission through inclined surface pressing connection, the inclined surface pressing connection mode can eliminate the gap between the driven gear shaft and related components, backlash-free transmission is realized, the precision and reliability of transmission are improved, vibration and noise in the transmission process are reduced, the large gear ring is rigidly connected with the workbench to realize rotary motion transmission, power transmitted by the driven gear shaft is accurately transmitted to the workbench through the large gear ring, and the workbench realizes rotary motion, and rigid connection ensures the accuracy and stability of motion transmission.

[0013] Further, the main driving gear shaft bearing set adopts a combination structure of tapered roller bearings and cylindrical roller bearings, axial positioning is realized through a turbine spacer sleeve, integral pre-tightening is realized by a precision locking nut, and sealing protection is realized by a skeleton oil seal. The tapered roller bearings in the combination structure of tapered roller bearings and cylindrical roller bearings in the main driving gear shaft bearing set can bear larger radial force and axial force, the cylindrical roller bearings mainly bear radial force, and the combination use of the two can fully exert their respective advantages, improve the carrying capacity and rotation precision of the main driving gear shaft; axial positioning is realized through the turbine spacer sleeve, the position of the bearing in the axial direction is accurately controlled, the correct cooperation between the bearing and the main driving gear shaft is ensured, axial movement is prevented, the stability and precision of transmission are improved, integral pre-tightening is realized by the precision locking nut, the internal clearance of the bearing is eliminated, the rigidity and rotation precision of the bearing are improved, vibration and noise are reduced, the service life of the bearing is prolonged, sealing protection is realized by the skeleton oil seal, lubricating oil leakage and the entry of external dust, impurities and the like into the internal part of the bearing are prevented, the bearing is protected from pollution, normal operation of the bearing is ensured, and the service life of the equipment is prolonged.

[0014] Further, the driven gear shaft is provided with an adjusting gasket set, which comprises an upper spacer sleeve, a bearing spacer sleeve and an adjusting gasket. The adjusting gasket is arranged in the sliding seat bearing hole below the cylindrical roller bearing and realizes axial gap adjustment and pre-tightening through a fastening screw. The driven gear shaft is provided with the adjusting gasket set for adjusting the axial gap of the driven gear shaft, ensuring the precision and stability of transmission. The upper spacer sleeve and the bearing spacer sleeve are used for axial positioning and isolating the bearing from other components. The adjusting gasket adjusts the axial gap by changing its thickness to meet different installation and use requirements. The adjusting gasket is arranged in the sliding seat bearing hole below the cylindrical roller bearing to provide an accurate installation position for the adjusting gasket. Through the cooperation of the adjusting gasket and the cylindrical roller bearing, the axial gap of the driven gear shaft is accurately adjusted. The axial gap adjustment and pre-tightening are realized through the fastening screw, which can fix the adjusting gasket at a suitable position and simultaneously exert a certain pre-tightening force on the driven gear shaft to eliminate the axial gap and ensure the continuity and precision of transmission.

[0015] Further, the driving mechanism adopts a three-stage driving structure of servo motor-planet reducer-coupler, the motor plate is rigidly connected with the slide, the output shaft of the reducer is connected with the input end of the transmission mechanism through the coupler, the servo motor provides accurate speed and position control, the planet reducer reduces the rotating speed and increases the torque, the power demand of the rotary table is met, the coupler realizes the power transmission and connection between the components, and the three-stage driving structure collectively guarantees the performance and reliability of the driving system; the motor plate is rigidly connected with the slide, the servo motor is fixed on the slide, the relative position accuracy between the motor and the transmission mechanism is guaranteed, and the power can be accurately and stably transmitted; the output shaft of the reducer is connected with the input end of the transmission mechanism through the coupler, the power output by the planet reducer is stably and accurately transmitted to the transmission mechanism, and a certain degree of axial, radial and angular displacement is allowed, the installation error is compensated, and the reducer and the transmission components are protected.

[0016] Further, the output end of the servo motor and the input end of the planet reducer are connected through a coupler, the output end of the reducer is connected with the driving shaft of the transmission mechanism through a coupler, the power transmission between the servo motor and the planet reducer is realized, the coupler can compensate the installation error between the two, a certain degree of displacement is allowed, the motor and the reducer are protected from damage, the stability and reliability of power transmission are guaranteed, the output end of the reducer is connected with the driving shaft of the transmission mechanism through a coupler, the power output by the planet reducer is accurately and stably transmitted to the driving shaft of the transmission mechanism, and the subsequent transmission process is continued, and the coupler also plays a role in compensating the installation error and protecting the components.

[0017] Further, the mechanism as a whole adopts a modular design, the slide, the transmission mechanism, the feeding mechanism and the driving mechanism can be independently disassembled, the mechanism as a whole adopts a modular design, the manufacturing, installation, debugging and maintenance of the components are facilitated, when a component fails, the disassembly and replacement can be quickly and independently carried out, the maintainability and production efficiency of the equipment are improved, and the maintenance cost is reduced; the slide, the transmission mechanism, the feeding mechanism and the driving mechanism can be independently disassembled, the parts are independent, the production, transportation, installation and maintenance are more convenient and flexible, the equipment adaptability and versatility are improved.

[0018] As described above, the beneficial effects of the present application are: 1. The double worm gear transmission structure of the present application constructs a self-adaptive anti-backlash mechanism through the cooperation of the double worm pairs and the bidirectional oil cylinder. The driving worm and the driving worm gear, and the anti-backlash worm and the anti-backlash worm gear form double transmission pairs, the bidirectional oil cylinder adjusts the axial thrust of the anti-backlash worm in real time according to the load signal, so that the worm pairs always maintain a backlash-free engagement, the transmission accuracy and the motion stability are significantly improved, and high-precision machining and heavy-load stable operation are realized.

[0019] 2、The slide shaft hole-lumen-shaft hole integrated design of the application optimizes the layout in three-dimensional space, integrates the traditional dispersed shafting support, lubrication channel and sealing structure into a modular unit, effectively improves the compactness and maintenance convenience of the structure.

[0020] 3、The reverse gap elimination technology of the application realizes full-stroke precision guarantee through a mechanical-electrical composite compensation mechanism, and fully enhances dynamic response and adaptive capacity, meeting the demand of complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0021] The application will be illustrated by examples and with reference to the accompanying drawings, in which: Figure 1 It is a structure schematic diagram of the rotary worktable rotary feeding mechanism of the application; Figure 2 It is a structure schematic diagram of the driven shaft of the transmission mechanism of the application; Figure 3 It is a structure schematic diagram of the driving shaft of the transmission mechanism of the rotary worktable rotary feeding mechanism of the application; Figure 4 It is a structure schematic diagram of the feeding mechanism of the rotary worktable rotary feeding mechanism of the application.

[0022] The reference signs: 1-bearing cover; 2-slide; 3-deep groove ball bearing; 4-spring spacer; 5-disc spring; 6-spring spacer; 7-thrust ball bearing I; 8-worm spacer sleeve; 9-driven shaft worm; 10-transmission driven shaft; 11-driven shaft turbine; 12-deep groove ball bearing; 13-bearing spacer sleeve; 14-tapered roller bearing; 15-connection sleeve; 16-driving shaft worm; 17-spacer sleeve; 18-driving shaft turbine; 19-tapered roller bearing; 20-bearing spacer sleeve; 21-inclined surface contact ball bearing; 22-bearing gland; 23-thrust ball bearing II; 24-end cover; 25-transmission driving shaft; 26-feeding driving gear shaft; 27-upper spacer sleeve; 28-skeleton oil seal; 29-tapered roller bearing; 30-flange plate; 31-tapered roller bearing; 32-turbine spacer sleeve; 33-precision locking nut; 34-cylindrical roller bearing; 35-axle elastic retainer; 36-large gear ring; 37-feeding driven gear shaft; 38-fastening screw; 39-upper spacer sleeve; 40-skeleton oil seal; 41-upper gland; 42-flange plate; 43-tapered roller bearing; 44-lower gland; 45-bearing spacer; 46-cylindrical roller bearing; 47-adjustment pad; 48-servo motor; 49-motor plate; 50-pressing plate; 51-reducer; 52-pressing plate; 53-rolling body; 54-scraping plate; 55-clamping oil cylinder; 56-driving mechanism; 57-slide workbench mechanism; 58-transmission mechanism; 59-feeding mechanism. DETAILED DESCRIPTION

[0023] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0024] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0025] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0026] like Figures 1-4 As shown, the CNC rotary table rotary feed mechanism of the present invention consists of four main modules: a drive mechanism, a sliding table mechanism, a transmission mechanism, and a feed mechanism. Each module adopts a modular design and can be independently assembled and disassembled. The structure and usage of each part are described in detail below with reference to the claims: Drive mechanism configuration: The servo motor 48 is rigidly connected to the slide 2 via the motor plate 49. Its output end is connected to the input end of the planetary reducer 51 via a coupling. The output end of the reducer is connected to the drive shaft 25 via another coupling. The three-stage drive structure ensures transmission efficiency and response speed, while the rigid connection between the motor plate and the slide ensures the overall structural stability.

[0027] Transmission mechanism assembly: The dual worm gear transmission structure uses a drive shaft 25 and a driven shaft 10 connected by a connecting sleeve 15 to form a two-stage transmission. At the drive shaft end: a bearing spacer 20 is installed in the first shaft hole. A tapered roller bearing 19 and a slanted contact ball bearing 21 are coaxially assembled. A second thrust ball bearing 23 is fitted and then pressed down by a bearing cap 22. An end cover 24 achieves final axial preload. At the driven shaft end: in the third shaft hole, a deep groove ball bearing 3 and a first thrust ball bearing 7 are respectively located at both ends of the worm 9. A disc spring 5 achieves axial preload compensation through spring spacers 4 and 6. The bearing cap 1 presses down the entire structure. The center distance error of the dual worm gear is controlled within ±0.02mm to ensure transmission accuracy.

[0028] Slide table mechanism: The slide 2 adopts an integrated design of shaft hole-inner cavity-shaft hole, with the transmission mechanism integrally installed in the inner cavity and fixed by a pressure cover. The worktable contacts the bed guide rail through rolling elements 53, the pressure plate 50 horizontally presses the rolling elements, the scraper 54 is vertically installed in the slide's moving direction, and the clamping cylinder 55 is circumferentially arranged on the top surface of the slide to achieve worktable positioning and clamping. This structure achieves dynamic connection and precise guidance between the slide and the worktable.

[0029] Feed mechanism composition: The driving gear shaft 26 is synchronously rotated with the driving shaft turbine 18 through key connection, is loaded into the slide shaft cavity through the flange plate 30, is combinedly installed with the tapered roller bearing 29, 31 and the cylindrical roller bearing 34, the turbine spacer sleeve 32 realizes axial positioning, and the precision locking nut 33 completes overall pre-tightening. The driven gear shaft 37 realizes backlash-free transmission through the inclined surface compression connection, the adjusting gasket set includes the upper spacer sleeve 27, the bearing spacer sleeve 13 and the adjusting gasket 47, and the axial gap adjustment is realized through the fastening screw 38. The large gear ring 36 is rigidly connected with the workbench, and rotary motion is transmitted through gear meshing.

[0030] Reverse gap elimination system: The driven shaft 10 is provided with a disc spring assembly, and the lost motion error when the motion direction of the double worm gear structure is switched is eliminated through spring pre-pressing. The spring spacer ring 4, 6 and the disc spring 5 cooperate to form a continuous pre-pressing force in the axial direction, so that the transmission chain has no gap when the direction is switched.

[0031] Transmission ratio and self-locking performance: The transmission ratio of the worm gear is designed to be 50:1 to 100:1, and the transmission ratio is greater than 30:1 through the lead angle optimization to have the self-locking function. When the workbench load is reversed, the self-locking characteristic can prevent reverse driving, and the positioning accuracy and motion stability are ensured.

[0032] Method for use: When operating, the servo motor 48 drives the transmission driving shaft 25 through the planetary reducer 51, and drives the driven shaft 10 through the double-stage worm gear transmission, drives the feed mechanism driving gear shaft 26 to rotate, and drives the workbench to realize accurate rotary motion through the large gear ring 36. The disc spring assembly compensates the reverse gap in real time, and ensures the accuracy when the motion direction is switched. The clamping oil cylinder 55 provides circumferential clamping force when positioning, and the scrap plate 54 continuously removes the guide rail impurities, and the motion stability is ensured.

[0033] The above-described embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the protection scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the technical scheme concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application.

Claims

1. A numerical control rotary table rotary feed mechanism characterized by comprising: The application relates to a double-worm-gear transmission structure, a slide shaft hole-cavity-shaft hole integrated system, a disc spring reverse gap elimination system and a transmission ratio and self-locking performance improving device.

2. The rotary feed mechanism according to claim 1, characterized in that: The slide workbench mechanism comprises a slide, a workbench, rolling bodies, a pressing plate, a scrap plate and a clamping oil cylinder; the rolling bodies are installed on the bottom side of the slide and are in contact with the bed guide rail, the pressing plate is horizontally installed to press the rolling bodies, the scrap plate is vertically installed in the moving direction of the slide, and the clamping oil cylinder is circumferentially arranged on the top surface of the slide.

3. The rotary feed mechanism according to claim 1, characterized in that: The driving shaft of the transmission mechanism adopts a modular design and comprises double-row angular contact ball bearings, a thrust ball bearing two, a driving shaft support sleeve, a tapered roller bearing and a driving shaft spacer sleeve; the support sleeve is installed in the first shaft hole, and the tapered roller bearing is axially positioned through the spacer sleeve and the worm.

4. The rotary feed mechanism of claim 1, wherein: The driven shaft of the transmission mechanism is provided with a disc spring assembly, which comprises a deep groove ball bearing, a thrust ball bearing one, a driven shaft spacer sleeve and a disc spring; the driven shaft end cover is installed in the third bearing hole, and the deep groove ball bearing and the thrust ball bearing one are separately arranged at the two ends of the worm.

5. The rotary feed mechanism of claim 1, wherein: The feeding mechanism adopts a double-gear shaft driving structure and comprises a driving gear shaft, a driven gear shaft, a flange plate and a large gear ring; the driving gear shaft is connected with the turbine through a key to rotate synchronously, penetrates through the flange plate and is installed in the slide shaft cavity, the driven gear shaft is connected through a bevel surface to realize non-backlash transmission, and the large gear ring is rigidly connected with the workbench to realize rotary motion transmission.

6. The rotary feed mechanism according to claim 5, characterized in that: The driving gear shaft bearing group adopts a tapered roller bearing and cylindrical roller bearing combined structure, is axially positioned through a turbine spacer sleeve, and can be pre-tightened as a whole through a precision locking nut.

7. The rotary feed mechanism according to claim 5, wherein: The driven gear shaft is provided with an adjusting gasket group, which comprises an upper spacer sleeve, a bearing spacer sleeve and an adjusting gasket; the adjusting gasket is installed in the slide bearing hole below the cylindrical roller bearing.

8. The rotary feed mechanism of claim 1, wherein: The driving mechanism adopts a servo motor-planetary reducer-coupling three-stage driving structure, the motor plate is rigidly connected with the slide, and the output shaft of the reducer is connected with the input end of the transmission mechanism through a coupling.

9. The rotary feed mechanism according to claim 8, characterized in that: The servo motor output end and the planetary reducer input end are connected through a coupling, and the reducer output end is connected with the driving shaft of the transmission mechanism through a coupling.

10. The rotary feed mechanism of claim 1, wherein: The mechanism adopts a modular design, and the slide, the transmission mechanism, the feeding mechanism and the driving mechanism can be independently disassembled.

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