A CNC rotary table for laser processing

Abstract

The invention discloses a CNC rotary table for laser processing, including a table base, a table, a rotating shaft, a support ring, a plurality of support balls and a needle roller. The support ring is installed on the table base, a thrust needle roller bearing is arranged between the support ring and the table, the rotating shaft extends outwardly from the support table, the support table is connected to the table, and the lower part is connected to the worm gear, a first positioning step for installing the needle roller and a second positioning step for installing the support ball are arranged on the support table, the needle roller is arranged on the inner side of the support ring, and the support ball is arranged at the bottom of the support ring. The thrust needle roller bearing of the invention bears axial force, and the plurality of support balls arranged in an annular manner are mainly subjected to axial force, so as to realize stable axial support of the table, and the needle roller can realize radial constraint on the rotating shaft, the support ring and the table base, the structure is simple and compact, the processing and assembly are convenient, the cost is low, and the maintenance is convenient, and the axial and radial bearing capacity of the rotary table is improved.

Description

Technical Field

[0001] The invention relates to a numerically controlled rotary table for laser processing, belonging to the technical field of numerically controlled machine tool components. Background Art

[0002] The CNC rotary table is an indispensable functional component of CNC boring and milling machines, gantry machining centers, CNC gear milling machines, gear grinding machines, etc. It is a worktable installed on rotary multi-station machine tools to complete multiple processes of parts in one go. It can perform CNC indexing on the workpiece under the drive of the relevant system or perform continuous rotary cutting on the workpiece in conjunction with the machine tool.

[0003] The existing machined parts have high requirements for the corner accuracy and surface roughness of machine tools and CNC rotary tables, and the CNC rotary table's motion accuracy, load-bearing capacity, and ability to cope with impact are related to the production and processing capacity and efficiency of the entire machine tool. The existing CNC rotary table has a complex structure, high cost, and difficult maintenance and adjustment. At the same time, the table is only supported by bearings, which have limited support and load-bearing capacity in the axial and radial directions, resulting in unsatisfactory application of the table's motion accuracy and load-bearing capacity. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a numerically controlled rotary table for laser processing which has a simple and compact structure, is convenient and quick to process and assemble, and has a large axial and radial load-bearing capacity.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A CNC rotary table for laser processing, comprising a table base, a table arranged on the table base, a rotating shaft, a support ring, a plurality of supporting balls and a plurality of needle rollers, wherein a through hole is arranged inside the rotating shaft, and the rotating shaft rotates under the action of a driving mechanism, wherein the driving mechanism comprises a driving motor, a worm and a worm wheel, wherein the worm wheel is mounted on the rotating shaft, and the worm is rotatably mounted on the table base, wherein one end of the worm is connected to the output shaft of the driving motor, and the other end is meshed with the worm wheel;

[0006] A positioning groove is provided on the workbench base, and the support ring is fixedly installed on the positioning groove. A thrust needle roller bearing is provided between the support ring and the workbench. A support platform extends out from the outer surface of the rotating shaft. The upper part of the support platform is connected to the workbench, and the lower part is connected to the worm gear. A first positioning step for installing multiple needle rollers and a second positioning step for installing multiple support balls are provided on the support platform. The needle rollers are arranged on the inner side of the support ring, and the support balls are arranged at the bottom of the support ring.

[0007] The beneficial effects of the present invention are as follows: the needle rollers of the thrust needle bearing are supported at the bottom of the workbench, and they mainly bear the axial force of the workbench. In addition, the multiple support balls arranged in an annular manner are also mainly subjected to axial forces, which can achieve stable axial support for the workbench. The multiple needle rollers are arranged vertically between the rotating shaft and the support ring, and they mainly bear radial forces, which can achieve radial constraints on the rotating shaft, the support ring, and the workbench base. In short, the present invention has a simple and compact structure, is easy to process and assemble, has low cost, and is easy to maintain. It improves the axial and radial load-bearing capacity of the rotary table, and the stable load-bearing ensures the motion accuracy of the rotary table. A through hole is provided in the rotating shaft, and the through hole can facilitate the passage of cables or lasers in the middle, and can be used in precision processing and detection such as laser processing and optical adjustment.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, a positioning adjustment pad is provided between the workbench and the support platform, and the positioning adjustment pad is arranged on the inner side of the thrust needle roller bearing.

[0010] The beneficial effect of adopting the above further solution is that, on the one hand, the inner side of the thrust needle roller bearing can be positioned, and on the other hand, the distance between the workbench and the rotating shaft can be adjusted to achieve axial clearance adjustment of the workbench.

[0011] Furthermore, a support pad is provided between the support ring and the positioning groove, and the support pad is arranged on the outer side of the support ball.

[0012] The beneficial effect of adopting the above further solution is that, on the one hand, the outer side of the supporting ball can be positioned, and on the other hand, the axial meshing position of the worm and the worm wheel can be adjusted.

[0013] Furthermore, the plurality of needle rollers are mounted on the first positioning step via a needle roller retainer.

[0014] The beneficial effect of adopting the above further scheme is that the needle roller is installed on the retaining frame, and then the retaining frame with the needle roller is installed on the first positioning step. On the one hand, it is convenient to install, and on the other hand, it improves the stability of the needle roller between the support ring and the support platform, thereby realizing radial constraint positioning of the support ring.

[0015] Furthermore, a plurality of the supporting balls are mounted on the second positioning step via a ball retaining frame.

[0016] The beneficial effect of adopting the above further scheme is that multiple support balls are installed on the ball retainer, and then the ball retainer with the support balls installed is installed on the second positioning step. On the one hand, it is convenient to install, and on the other hand, it improves the stability of the support balls on the second positioning step. The support balls bear axial forces to achieve axial load-bearing on the workbench.

[0017] Furthermore, a rotary oil seal is provided between the workbench base and the rotating shaft.

[0018] The beneficial effects of adopting the above further solution are, on the one hand, reducing the wear between the rotating shaft and the workbench base, and on the other hand, avoiding the overflow of grease.

[0019] Furthermore, a labyrinth seal is provided between the workbench and the workbench base.

[0020] The beneficial effect of adopting the above further solution is to prevent the grease from being thrown out during the rotation of the workbench.

[0021] Furthermore, the workbench base is provided with mounting holes for installing fastening bolts, and the support ring is installed on the workbench base through the fastening bolts.

[0022] The beneficial effect of adopting the above further solution is that the support ring is fixedly installed on the workbench base by tightening the bolts.

[0023] Furthermore, an eccentric sleeve is provided on the workbench base, the worm is connected to the eccentric sleeve via a bearing and / or a sleeve, and the motor base of the drive motor is mounted on the eccentric sleeve.

[0024] The beneficial effect of adopting the above further scheme is that the installation and positioning of the motor and the screw are realized, and the eccentric sleeve can eliminate the meshing clearance of the worm gear by adjusting the eccentricity, realize small clearance precision transmission, and improve the indexing accuracy of the worm gear.

[0025] Furthermore, the output shaft of the driving motor is connected to the worm through a coupling.

[0026] The beneficial effect of adopting the above further solution is that the motor rotates, driving the worm to rotate through the coupling, thereby realizing power drive for the worm. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction (rotated 90 degrees clockwise);

[0029] In the figure, 1, workbench base; 2, workbench; 3, rotating shaft; 301, support platform; 302, first positioning step; 303, second positioning step; 4, worm gear; 5, worm; 6, thrust needle roller bearing; 7, support ring; 8, support ball; 9, needle roller; 10, rotary oil seal; 11, labyrinth seal; 12, positioning adjustment pad; 13, support pad; 14, mounting hole; 15, bolt; 16, eccentric sleeve; 17, drive motor; 18, motor seat; 19, coupling. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 and Figure 2 As shown, a CNC rotary table for laser processing includes a table base 1, a table 2 arranged on the table base, a rotating shaft 3, a support ring 7, a plurality of supporting balls 8 and a plurality of needle rollers 9, wherein a through hole is arranged inside the rotating shaft, and the rotating shaft rotates under the action of a driving mechanism, wherein the driving mechanism includes a driving motor, a worm 5 and a worm wheel 4, wherein the worm wheel is mounted on the rotating shaft, and the worm is rotatably mounted on the table base, wherein one end of the worm is connected to the output shaft of the driving motor, and the other end is meshed with the worm wheel;

[0032] A positioning groove is provided on the workbench base, and the support ring is fixedly installed on the positioning groove. A thrust needle roller bearing 6 is provided between the support ring and the workbench. A support platform 301 extends from the outer surface of the rotating shaft. The upper part of the support platform is connected to the workbench, and the lower part is connected to the worm gear. A first positioning step 302 for installing multiple needle rollers and a second positioning step 303 for installing multiple support balls are provided on the support platform. The needle rollers are arranged on the inner side of the support ring, and the support balls are arranged at the bottom of the support ring.

[0033] Multiple supporting balls and needle rollers form a close-packed shaft structure. The needle rollers and supporting balls have an interference fit with the shaft. After assembly, small radial and axial clearances can be achieved, radial runout can be reduced, transmission and indexing accuracy can be improved, the motion accuracy of the rotary table can be guaranteed, and the service life of the rotary table can be extended.

[0034] The supporting ball can be a steel ball.

[0035] A positioning adjustment pad 12 is provided between the workbench and the support platform, and the positioning adjustment pad is arranged on the inner side of the thrust needle roller bearing. On the one hand, the inner side of the thrust needle roller bearing can be positioned, and on the other hand, the distance between the workbench and the rotating shaft can be adjusted to achieve axial clearance adjustment of the workbench.

[0036] A support pad 13 is also provided between the support ring and the positioning groove, and the support pad is arranged outside the support ball. On the one hand, the outer side of the support ball is positioned, and on the other hand, the axial meshing position of the worm and the worm wheel can be adjusted.

[0037] The plurality of needle rollers are mounted on the first positioning step through a needle roller cage. The needle rollers are mounted on the cage, and then the cage with the needle rollers is mounted on the first positioning step, which is convenient for installation and improves the stability of the needle rollers between the support ring and the support platform, thereby realizing radial constraint positioning of the support ring.

[0038] The plurality of support balls are mounted on the second positioning step through a ball retainer. The plurality of support balls are mounted on the ball retainer, and then the ball retainer with the support balls mounted thereon is mounted on the second positioning step. This facilitates installation on the one hand, and improves the stability of the support balls on the second positioning step on the other hand. The support balls bear axial force, thereby realizing axial load-bearing of the workbench.

[0039] A rotary oil seal 10 is provided between the workbench base and the rotating shaft. On the one hand, it reduces the wear between the rotating shaft and the workbench base, and on the other hand, it prevents the overflow of grease.

[0040] A labyrinth seal 11 is provided between the workbench and the workbench base to prevent the grease from being thrown out during the rotation of the workbench.

[0041] The workbench and the worm gear are connected to the support platform via bolts 15 respectively.

[0042] The workbench base is provided with mounting holes 14 for mounting fastening bolts 15, and the support ring is mounted on the workbench base through the fastening bolts. The fastening bolts are used to achieve fixed mounting of the support ring on the workbench base.

[0043] The workbench base is provided with an eccentric sleeve 16, the worm is connected to the eccentric sleeve through a bearing and / or a sleeve, and the motor seat 18 of the drive motor 17 is installed on the eccentric sleeve. The installation and positioning of the motor and the screw are realized, and the eccentric sleeve can eliminate the meshing clearance of the worm gear by adjusting the eccentricity, realize small clearance precision transmission, and improve the indexing accuracy of the worm gear.

[0044] The output shaft of the driving motor is connected to the worm through a coupling 19. The motor rotates, and the worm is driven to rotate through the coupling, thereby realizing power drive of the worm.

[0045] The thrust needle roller bearing is supported at the bottom of the worktable, and it mainly bears the axial force of the worktable. In addition, the multiple support balls arranged in a ring are also mainly subjected to axial force, which can achieve stable axial support for the worktable. Multiple needle rollers are arranged vertically between the rotating shaft and the support ring, and they mainly bear radial force, which can achieve radial constraints on the rotating shaft, support ring, and worktable base. The design of axial and radial support components can greatly reduce the weight of the CNC rotary table, which is very suitable for miniaturized CNC rotary tables.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A CNC rotary table for laser processing, characterized in that: It includes a workbench base, a workbench arranged on the workbench base, a rotating shaft, a supporting ring, a plurality of supporting balls and a plurality of roller needles, wherein a through hole is arranged inside the rotating shaft, and the rotating shaft rotates under the action of a driving mechanism, and the driving mechanism includes a driving motor, a worm and a worm wheel, and the worm wheel is installed on the rotating shaft, and the worm is rotatably installed on the workbench base, and one end of the worm is connected to the output shaft of the driving motor, and the other end is meshed with the worm wheel; A positioning groove is provided on the workbench base, the support ring is fixedly installed on the positioning groove, a thrust needle roller bearing is provided between the support ring and the workbench, a support platform extends out from the outer surface of the rotating shaft, the upper part of the support platform is connected to the workbench, and the lower part is connected to the worm gear, a first positioning step for installing a plurality of the needle rollers and a second positioning step for installing a plurality of the support balls are provided on the support platform, the needle rollers are arranged on the inner side of the support ring, and the support balls are arranged at the bottom of the support ring; A positioning adjustment pad is provided between the workbench and the support platform, and the positioning adjustment pad is arranged on the inner side of the thrust needle roller bearing; a rotary oil seal is provided between the workbench base and the rotating shaft.

2. The CNC rotary table according to claim 1, characterized in that: A support pad is further provided between the support ring and the positioning groove, and the support pad is arranged on the outer side of the support ball.

3. The CNC rotary table according to claim 1 or 2, characterized in that: The plurality of needle rollers are mounted on the first positioning step via a needle roller retainer.

4. The CNC rotary table according to claim 1 or 2, characterized in that: A plurality of the supporting balls are mounted on the second positioning step via a ball retainer.

5. The CNC rotary table according to claim 1, characterized in that: A labyrinth seal is provided between the workbench and the workbench base.

6. The CNC rotary table according to claim 1, characterized in that: The workbench base is provided with mounting holes for mounting fastening bolts, and the support ring is mounted on the workbench base through the fastening bolts.

7. The CNC rotary table according to claim 1 or 2, characterized in that: An eccentric sleeve is arranged on the workbench base, the worm is connected to the eccentric sleeve via a bearing and / or a shaft sleeve, and the motor seat of the driving motor is mounted on the eccentric sleeve.

8. The CNC rotary table according to claim 1, characterized in that: The output shaft of the driving motor is connected to the worm through a coupling.

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