A slewing bearing and its manufacturing method and application

Abstract

The present invention relates to a slewing bearing and its manufacturing method and application. The slewing bearing includes an internal gear ring, an external gear ring and rolling elements. A first meshing tooth is provided on the inner side of the internal gear ring, and a second meshing tooth is provided on the outer side of the external gear ring. The external gear ring includes a first external gear ring and a second external gear ring which are fixedly connected. The manufacturing method of this slewing bearing is to process a metal ring into an internal gear ring, and fasten two metal rings together to process into a first external gear ring and a second external gear ring. The slewing bearing is applied to the motion control of a workpiece clamping assembly in a polishing machine. The slewing bearing of the present invention directly engages the internal gear ring and the external gear ring through rolling elements, not only realizing the miniaturization of the volume of the slewing bearing with internal and external teeth, but also improving the strength of the slewing bearing. The design of dividing the external gear ring into two parts makes the installation of the slewing bearing simpler and more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical design, and particularly to a slewing bearing, a manufacturing method thereof, and an application in a polishing machine. Background Art

[0002] Currently, the bearings with internal teeth or external teeth commonly used in the mechanical field are components called slewing bearings in the industry. This component has extremely strong lateral bearing capacity and a compact design, making it an excellent mechanical component. However, a single-tooth slewing bearing cannot simultaneously achieve different transmission functions, while a slewing bearing with both internal teeth and external teeth can simultaneously achieve different transmission functions.

[0003] Chinese Utility Model Patent CN213711620U, "A Slewing Bearing, a Rotary Lifting Mechanism, and an AGV Cart", discloses a slewing bearing with both internal teeth and external teeth. It includes an intermediate support ring, an internal gear ring rotatably arranged inside the intermediate support ring, and a first meshing tooth arranged inside the internal gear ring; an external gear ring rotatably arranged outside the intermediate support ring, and a second meshing tooth arranged outside the external gear ring. When this slewing bearing is used in an AGV cart, the AGV cart platform can rotate simultaneously during lifting, and this slewing bearing simultaneously achieves different transmission functions.

[0004] However, the internal and external gear rings of this slewing bearing must be connected through an intermediate support ring. The intermediate support ring is rotatably connected to the internal gear ring through balls, and the intermediate support ring is also rotatably connected to the external gear ring through balls. In order to maintain the strength of the slewing bearing, the internal and external gears and the intermediate support ring cannot be made too thin, resulting in an overly large volume of the slewing bearing component. At the same time, since the intermediate support ring is connected to the internal gear ring and the external gear ring through balls, there is a ring of balls on each of the inner and outer sides of the intermediate support ring. Therefore, the installation process is cumbersome.

[0005] Therefore, for those skilled in the art, it is of relatively practical significance to provide a slewing bearing with internal and external teeth having a new structure. Summary of the Invention

[0006] The object of the present invention is to provide a slewing bearing, a manufacturing method thereof, and an application, which solve the disadvantages of the existing slewing bearing having a large volume and a cumbersome installation process. The slewing bearing of the present invention has a reasonable structure, a small volume, good strength, is easy to manufacture, and is convenient to install.

[0007] To achieve the above object, the technical solution of the present invention is:

[0008] A slewing bearing, which comprises an internal gear ring, an external gear ring and rolling elements. A first meshing tooth is arranged on the inner side of the internal gear ring, and a second meshing tooth is arranged on the outer side of the external gear ring. Annular grooves are arranged on the outer side of the internal gear ring and the corresponding inner side of the external gear ring. The annular groove on the outer side of the internal gear ring and the annular groove on the inner side of the external gear ring together form a raceway for arranging the rolling elements. The internal gear ring and the external gear ring are connected through the rolling elements so as to be relatively rotatable.

[0009] The external gear ring comprises a first external gear ring and a second external gear ring which are fixedly connected. Annular recesses are arranged on the opposite inner surfaces of the inner side of the first external gear ring and the inner side of the second external gear ring. The annular recess on the inner side of the first external gear ring and the annular recess on the inner side of the second external gear ring together form the annular groove on the inner side of the external gear ring.

[0010] The first external gear ring and the second external gear ring are fixed by fasteners.

[0011] The rolling elements are ball bearings. The cross-sections of the annular grooves arranged on the outer side of the internal gear ring and the corresponding inner side of the external gear ring are both the same semi-circular shape.

[0012] The rolling elements are cylindrical rollers. The cross-sections of the annular grooves arranged on the outer side of the internal gear ring and the corresponding inner side of the external gear ring are both the same isosceles right-angled shape.

[0013] A manufacturing method of the slewing bearing as described above. The manufacturing steps of the internal gear ring are as follows: Take a metal ring, machine an annular groove on the outer peripheral surface of the metal ring, and machine a first meshing tooth on the inner hole surface of the metal ring.

[0014] The manufacturing steps of the external gear ring are as follows: Take two metal rings, drill holes at the same positions on the two metal rings, fasten the two metal rings together through the holes with fasteners. Taking the joint of the two metal rings as the center line, machine annular grooves in the inner holes of the two metal rings, machine second meshing teeth on the outer perimeters of the two metal rings, and make the two metal rings into a first external gear ring and a second external gear ring.

[0015] The installation steps of the slewing bearing are as follows: Place the internal gear ring in an installation tool, sleuth the first external gear ring or the second external gear ring outside the internal gear ring. Place the rolling elements in the annular groove at the joint of the internal gear ring and the first external gear ring or the second external gear ring. Then cover the second external gear ring or the first external gear ring on the first external gear ring or the second external gear ring, and fasten the first external gear ring or the second external gear ring with fasteners.

[0016] After the internal gear ring is manufactured, heat treatment is performed on the outer peripheral annular groove and the first meshing tooth of the internal gear ring. After the first external gear ring or the second external gear ring is manufactured, heat treatment is performed on the inner hole annular groove and the second meshing tooth of the first external gear ring and the second external gear ring.

[0017] During the manufacturing process of the external gear ring, after fastening two metal rings together with the hole fasteners, a positioning hole is machined, and then a positioning pin is inserted into the positioning hole; during the installation process of the slewing bearing, the first external gear ring or the second external gear ring is fastened with the positioning pin and the fasteners.

[0018] During the installation process of the slewing bearing, the rolling elements are ball bearings, and the cross-sections of the annular grooves provided on the outer side of the internal gear ring and the corresponding inner side of the external gear ring are both the same semi-circular shape.

[0019] During the installation process of the slewing bearing, the rolling elements are cylindrical rollers, and the cross-sections of the annular grooves provided on the outer side of the internal gear ring and the corresponding inner side of the external gear ring are both the same isosceles right-angled shape.

[0020] A slewing bearing as described above is applied to the motion control of the workpiece clamping assembly in a polishing machine.

[0021] The motion control mechanism of the workpiece clamping assembly for the polishing machine includes a clamping assembly, a combined bearing, and a power mechanism;

[0022] The combined bearing includes a slewing bearing provided with an internal gear ring and an external gear ring, and a planetary drive gear and a planetary driven gear provided on a planetary support within the internal gear ring. The planetary drive gear meshes with the planetary driven gear, and the planetary driven gear meshes with the internal gear ring. An umbrella-shaped drive gear is provided on the planetary support;

[0023] The power mechanism includes a first drive motor and a second drive motor. The output shaft of the first drive motor is connected to a main drive gear, and the main drive gear meshes with the external gear ring. The output shaft of the second drive motor is connected to the planetary drive gear;

[0024] The clamping assembly includes a support and a telescopic drive shaft. The support is connected to the external gear ring; upper and lower clamps that can slide relative to each other are respectively provided at both ends of the support. An upper workpiece rotating shaft is provided on the upper clamp, and a lower workpiece rotating shaft is provided on the lower clamp; an umbrella-shaped driven gear is provided on the telescopic drive shaft. The umbrella-shaped drive gear meshes with the umbrella-shaped driven gear, driving the umbrella-shaped driven gear to rotate, and further driving the telescopic drive shaft to rotate. The telescopic drive shaft drives the upper workpiece rotating shaft and the lower workpiece rotating shaft to rotate synchronously; A sliding device for driving the upper and lower clamps to slide on the support is provided on the support.

[0025] The upper fixture includes an upper fixing plate which is slidably connected to the bracket. The upper fixing plate is provided with an upper fixture bracket. One end of the upper fixture bracket is provided with an upper driving wheel, the lower end of the upper driving wheel is connected to the telescopic drive shaft, the other end of the upper fixture bracket is provided with an upper driven wheel, and the lower end of the upper driven wheel is connected to the upper workpiece rotating shaft. An upper transmission belt is arranged between the upper end of the upper driving wheel and the upper end of the upper driven wheel. The upper driving wheel drives the upper driven wheel to rotate through the upper transmission belt, and then drives the upper workpiece rotating shaft to rotate.

[0026] The lower fixture includes a lower fixing plate which is slidably connected to the bracket. The lower fixing plate is provided with a lower fixture bracket. One end of the lower fixture bracket is provided with a lower driving wheel, the upper end of the lower driving wheel is connected to the telescopic drive shaft, the other end of the lower fixture bracket is provided with a lower driven wheel, and the upper end of the lower driven wheel is connected to the lower workpiece rotating shaft. A lower transmission belt is arranged between the lower end of the lower driving wheel and the lower end of the lower driven wheel. The lower driving wheel drives the lower driven wheel to rotate through the lower transmission belt, and then drives the lower workpiece rotating shaft to rotate.

[0027] The sliding device includes a slide rail arranged on the bracket. The upper fixing plate and the lower fixing plate are slidably connected to the bracket through the slide rail. The upper fixing plate is fixedly provided with a first rack, the lower fixing plate is fixedly provided with a second rack, and the first rack is parallel to the second rack. The bracket is provided with a gear which is arranged between the first rack and the second rack. The lower end of the first rack and the upper end of the second rack are respectively engaged with both sides of the gear.

[0028] The bracket is provided with a driving device which drives the upper fixture or the lower fixture to move, and drives the lower fixture or the upper fixture through the combination of the first rack, the second rack and the gear.

[0029] The driving device is a cylinder.

[0030] The telescopic drive shaft is a spline shaft.

[0031] The advantages of the present invention are as follows:

[0032] The slewing bearing of the present invention has an internal gear ring and an external gear ring directly engaged through rolling elements. Compared with the prior art, not only is one circle of rolling elements reduced, but also the intermediate support ring in the prior art is removed, thus achieving miniaturization of the volume of the slewing bearing with internal and external teeth. Moreover, while achieving volume miniaturization, the strength and firmness of the slewing bearing are maintained. There is only one circle of rolling elements between the internal and external gear rings of the slewing bearing of the present invention, and with the design of splitting the external gear ring into two parts, when installing the rolling elements, first mate one of the external gear rings with the internal gear ring, and then the rolling elements can be very conveniently installed and arranged in the raceway. Subsequently, as long as the other external gear ring is covered and fastened, the installation of the entire slewing bearing is completed. The installation process is simpler and more convenient compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the slewing bearing of the present invention.

[0034] Figure 2 is a sectional view of the first embodiment of the slewing bearing of the present invention.

[0035] Figure 3 is an exploded schematic diagram of the first embodiment of the slewing bearing of the present invention.

[0036] Figure 4 is a sectional view of the second embodiment of the slewing bearing of the present invention.

[0037] Figure 5 is an exploded schematic diagram of the second embodiment of the slewing bearing of the present invention.

[0038] Figure 6 is a schematic diagram of the structure of the motion control mechanism of the workpiece holding assembly for a polishing machine applying the present invention.

[0039] Figure 7 is a sectional view of the structure of the motion control mechanism of the workpiece holding assembly for a polishing machine applying the present invention Figure 1 .

[0040] Figure 8 is a sectional view of the structure of the motion control mechanism of the workpiece holding assembly for a polishing machine applying the present invention Figure 2 .

[0041] Figure 9 is a sectional view of the structure of the motion control mechanism of the workpiece holding assembly for a polishing machine applying the present invention Figure 3 .

[0042] In the figure: 1 - internal gear ring; 2 - external gear ring; 21 - first external gear ring; 22 - second external gear ring; 3 - first meshing tooth; 4 - second meshing tooth; 5 - ball; 6 - roller; 7 - first fixing plate; 8 - second fixing plate; 9 - first driving motor; 10 - second driving motor; 11 - main driving gear; 12 - planetary carrier; 13 - planetary driving gear; 14 - planetary driven gear; 15 - bevel driving gear; 16 - bracket; 17 - spline shaft; 18 - upper workpiece rotating shaft; 19 - lower workpiece rotating shaft; 20 - bevel driven gear; 21 - upper fixing plate; 22 - lower fixing plate; 23 - upper fixture bracket; 24 - lower fixture bracket; 25 - upper driving pulley; 26 - upper driven pulley; 27 - upper driving belt; 28 - lower driving pulley; 29 - lower driven pulley; 30 - lower driving belt; 31 - slide rail; 32 - first rack; 33 - second rack; 34 - gear; 35 - driving device. Detailed implementation mode

[0043] As Figure 1 、 Figure 2 shown, it is a slewing bearing of the present invention, which includes an internal gear ring 1, an external gear ring 2 and rolling elements. A first meshing tooth 3 is arranged inside the internal gear ring 1, and a second meshing tooth 4 is arranged outside the external gear ring 2. Annular grooves are arranged on the outside of the internal gear ring 1 and the corresponding inside of the external gear ring 2. The annular groove on the outside of the internal gear ring 1 and the annular groove on the inside of the external gear ring 2 together form a raceway for arranging the rolling elements. The internal gear ring 1 and the external gear ring 2 are connected through the rolling elements so as to be relatively rotatable.

[0044] Preferably, as Figure 2 、 Figure 3 shown, the external gear ring 2 includes a first external gear ring 21 and a second external gear ring 22 which are fixedly connected. Annular recesses are arranged on the opposite inner surfaces of the inside of the first external gear ring 21 and the inside of the second external gear ring 22. The annular recess on the inside of the first external gear ring 21 and the annular recess on the inside of the second external gear ring 22 together form the annular groove on the inside of the external gear ring.

[0045] As Figure 3 、 Figure 5 shown, the design of the first external gear ring 21 and the second external gear ring 22 of the external gear ring makes the installation of the rolling elements of the slewing bearing of the present invention convenient, and the installation of the whole component of the slewing bearing is also

[0046] Furthermore, the first external gear ring 21 and the second external gear ring 22 can be fixed by fasteners such as bolts and rivets.

[0047] Embodiment 1, as Figure 3As shown, when the rolling elements are ball bearings 5, since the cross-section of the ball bearings 5 is circular, correspondingly, the cross-sections of the annular grooves provided on the outer side of the internal gear ring 1 and the inner side of the corresponding external gear ring 2 are both the same semi-circular shape. In this way, when the internal gear ring 1 and the external gear ring 2 are combined, the annular grooves of the two together form a circular raceway for accommodating the ball bearings 5.

[0048] Furthermore, when the external gear ring 2 is composed of a first external gear ring 21 and a second external gear ring 22, when machining the annular groove, first fasten the first external gear ring 21 and the second external gear ring 22 together with fasteners, and take the joint seam of the two as the center line to machine the annular groove, so as to ensure that the annular groove of the external gear ring 2 and the annular groove of the internal gear ring 1 can accurately form the raceway of the ball bearings 5 without deviation.

[0049] Embodiment 2, when the rolling elements are rollers 6, the cross-section of the rollers 6 is square, and, as Figure 5 shown, in the technical field, generally adjacent rollers 6 are arranged in a crosswise pattern in opposite directions. Therefore, as Figure 4 shown, the cross-sections of the annular grooves provided on the outer side of the internal gear ring 1 and the inner side of the corresponding external gear ring 2 are both the same isosceles right-angled shape. In this way, when the internal gear ring 1 and the external gear ring 2 are combined, the annular grooves of the two together form a square raceway for the rollers 6.

[0050] Furthermore, when the external gear ring 2 is composed of a first external gear ring 21 and a second external gear ring 22, when machining the annular groove, first fasten the first external gear ring 21 and the second external gear ring 22 together with fasteners, and take the joint seam of the two as the center line to machine the annular groove, so as to ensure that the annular groove of the external gear ring 2 and the annular groove of the internal gear ring 1 can accurately form the raceway of the rollers 6 without deviation.

[0051] A manufacturing method of a slewing bearing as Figure 3 、 Figure 5 shown, including the manufacturing of the internal gear ring 1 and the external gear ring 2, and the installation of the slewing bearing.

[0052] The manufacturing steps of the internal gear ring 1 are as follows: Take a metal ring blank, perform rough machining and finish machining on the inner hole, outer circumference and surface of the metal ring blank, machine an annular groove on the outer circumferential surface of the machined metal ring, and machine the first meshing teeth 3 on the inner hole surface of the machined metal ring.

[0053] Furthermore, after manufacturing, perform heat treatment on the annular groove and the first meshing teeth 3 to ensure the strength of the annular groove and the first meshing teeth 3.

[0054] The manufacturing steps of the external gear ring 2 are as follows: Take two metal ring blanks, perform rough machining and finish machining on the inner hole, outer circumference and surface of the metal ring blanks, drill holes at the same positions on the two machined metal rings, and fasten the two metal rings together through the holes with fasteners, as Figure 3 、Figure 5 As shown, bolts are usually used as fasteners.

[0055] Taking the joint of two metal rings as the center line, annular grooves are machined in the inner holes of the two fastened metal rings, and second engaging teeth 4 are machined on the outer circumferences of the two metal rings. The two metal rings are made into a first outer gear ring 21 and a second outer gear ring 22.

[0056] Furthermore, in order to improve the machining accuracy of the second engaging teeth 4 and the annular grooves, after fastening the two metal rings together with fasteners, positioning holes are further made on the surfaces of the metal rings, preferably taper positioning holes, and then positioning pins are inserted into the positioning holes. Through the fasteners and the positioning pins, the machining accuracy of the outer gear ring 2 meets the design requirements.

[0057] The installation steps of the slewing bearing are as follows: Place the inner gear ring 1 in an installation tool (such as an installation fixture), sleuth an outer gear ring outside the inner gear ring 1, which can be the first outer gear ring 21 or the second outer gear ring 22. Place rolling elements in the annular groove at the joint of the inner gear ring 1 and the first outer gear ring 21 or the second outer gear ring 22, and then cover the other outer gear ring, that is, the second outer gear ring 22 or the first outer gear ring 21, on the first outer gear ring 21 or the second outer gear ring 22. First, fix the first outer gear ring 21 and the second outer gear ring 22 with fasteners, then insert the positioning pins, and finally further tighten the fasteners firmly.

[0058] As Figure 2 、 Figure 3 shown, when the rolling elements are selected as balls 5, the cross-sections of the annular grooves provided on the outer side of the inner gear ring 1 and the inner side of the corresponding outer gear ring 2 are both the same semi-circular shape.

[0059] As Figure 4 、 Figure 5 shown, when the rolling elements are selected as rollers 6, the cross-sections of the annular grooves provided on the outer side of the inner gear ring 1 and the inner side of the corresponding outer gear ring 2 are both the same isosceles right-angled shape.

[0060] Please combine Figure 1 and refer to Figures 6 - 9 , which is an embodiment of the application of the slewing bearing of the present invention in the motion control of the workpiece clamping assembly in a polishing machine. Specifically as follows:

[0061] This application relates to a motion control mechanism for a workpiece clamping assembly of a polishing machine, which includes a clamping assembly, a combined bearing, and a power mechanism.

[0062] The combined bearing includes a slewing bearing provided with an inner gear ring 1 and an outer gear ring 2 as Figure 1 shown, and as Figure 7 、 Figure 9The planetary drive gear 13 and the planetary driven gear 14 disposed on the planetary carrier 12 within the internal gear ring 1 as shown. The planetary drive gear 13 meshes with the planetary driven gear 14, and the planetary driven gear 14 meshes with the internal gear ring 1. The planetary drive gear 13 drives the planetary driven gear 14 mounted on the planetary carrier 12, and the planetary driven gear 14 rotates along with the fixed internal gear ring 1; as Figure 8 shown, an umbrella-shaped drive gear 15 is disposed on the planetary carrier 12 to achieve a 90° displacement drive.

[0063] The power mechanism includes a first drive motor 9 and a second drive motor 10. The output shaft of the first drive motor 9 is connected to the main drive gear 11, the main drive gear 11 meshes with the external gear ring 2, and the output shaft of the second drive motor 10 is connected to the planetary drive gear 13.

[0064] The clamping assembly includes a bracket 16 and a telescopic drive shaft. The bracket 16 is connected to the external gear ring 2; upper and lower clamps that can slide relative to each other are respectively disposed at both ends of the bracket 16, as Figure 7 、 Figure 8 、 Figure 9 shown. The upper clamp is provided with an upper workpiece rotating shaft 18, and the lower clamp is provided with a lower workpiece rotating shaft 19; the telescopic drive shaft is provided with an umbrella-shaped driven gear 20, and the umbrella-shaped drive gear 15 meshes with the umbrella-shaped driven gear 20 to achieve displacement transmission of power, drive the umbrella-shaped driven gear 20 to rotate, and further drive the telescopic drive shaft to rotate in the vertical direction.

[0065] Preferably, the telescopic drive shaft is a spline shaft 17.

[0066] As a preferred embodiment, as Figure 6 shown, a first fixing plate 7 is provided. The clamping assembly can also be connected to the external gear ring 2 through the first fixing plate 7. The specific implementation method is that the bracket 16 is fixed on one side of the first fixing plate 7, the other side of the first fixing plate 7 is fixedly connected to the external gear ring 2 of the combined bearing, and a hole through which the planetary carrier 12 can pass is provided on the first fixing plate 7; a second fixing plate 8 is provided, and the first drive motor 9 and the second drive motor 10 are disposed on the second fixing plate 8. Holes through which the output shafts of the first drive motor 9 and the second drive motor 10 can pass are also provided on the second fixing plate 8. The output shaft of the first drive motor 9 is connected to the main drive gear 11, the main drive gear 11 meshes with the external gear ring 2, and the output shaft of the second drive motor 10 is connected to the planetary drive gear 13.

[0067] The upper fixture includes an upper fixing plate 21, which is slidably connected to the bracket 16. The upper fixing plate 21 is provided with an upper fixture bracket 23. One end of the upper fixture bracket 23 is provided with an upper driving wheel 25, the lower end of the upper driving wheel 25 is connected to the spline shaft 17, the other end of the upper fixture bracket 23 is provided with an upper driven wheel 26, and the lower end of the upper driven wheel 26 is connected to the upper workpiece rotating shaft 18. An upper transmission belt 27 is arranged between the upper end of the upper driving wheel 25 and the upper end of the upper driven wheel 26. The rotation of the spline shaft 17 drives the upper driving wheel 25 to rotate, and drives the upper transmission belt 27 to rotate, thereby driving the upper driven wheel 26 to rotate and further driving the upper workpiece rotating shaft 18 to rotate.

[0068] The lower fixture includes a lower fixing plate 22, which is slidably connected to the bracket 16. The lower fixing plate 22 is provided with a lower fixture bracket 24. One end of the lower fixture bracket 24 is provided with a lower driving wheel 28, the upper end of the lower driving wheel 28 is connected to the spline shaft 17, the other end of the lower fixture bracket 24 is provided with a lower driven wheel 29, and the upper end of the lower driven wheel 29 is connected to the lower workpiece rotating shaft 19. A lower transmission belt 30 is arranged between the lower end of the lower driving wheel 28 and the lower end of the lower driven wheel 29. The rotation of the spline shaft 17 drives the lower driving wheel 28 to rotate, and drives the lower transmission belt 30 to rotate, thereby driving the lower driven wheel 29 to rotate and further driving the lower workpiece rotating shaft 19 to rotate.

[0069] The bracket 16 is provided with a sliding device for the upper fixture and the lower fixture to slide on the bracket 16. As Figure 6 、 Figure 7 shown, the sliding device includes a slide rail 31 arranged on the bracket 16. The upper fixing plate 21 and the lower fixing plate 22 are slidably connected to the bracket 16 through the slide rail 31. The upper fixing plate 21 is fixedly provided with a first rack 32, which extends downward. The lower fixing plate 22 is fixedly provided with a second rack 33, which extends upward. The first rack 32 and the second rack 33 are parallel and move towards or away from each other. The bracket is provided with a gear 34, which is arranged between the first rack 32 and the second rack 33. The lower end of the first rack 32 and the upper end of the second rack 33 are respectively engaged with both sides of the gear 34.

[0070] The bracket 16 is provided with a driving device 35, which drives the upper fixture or the lower fixture to move, and drives the lower fixture or the upper fixture through the combination of the first rack 32, the second rack 33 and the gear 34.

[0071] Preferably, the driving device 35 is a cylinder.

[0072] If the air cylinder is arranged at the upper fixture end, the air cylinder pushes the first rack 32 of the upper fixing plate 21 to move downward, drives the gear 34 to rotate, and thus drives the second rack 33 of the lower fixing plate 22 to move upward, so that the upper and lower fixtures approach each other. Because the telescopic spline shaft 17 is used, the upper workpiece rotating shaft 18 and the lower workpiece rotating shaft 19 can rotate simultaneously and synchronously during the approaching process of the upper and lower fixtures.

[0073] Similarly, the same applies when the air cylinder is arranged at the lower fixture end.

[0074] In the above application, the present invention utilizes a slewing bearing with an internal gear ring and an external gear ring and a spline shaft. The external gear ring is driven by the main drive gear to realize the left - right rotation of the workpiece clamping assembly for the entire polishing machine in the vertical plane; the internal gear ring can rotate independently relative to the external gear ring. A planetary bracket is arranged on the internal gear ring, and an umbrella - shaped driving gear is installed, which is vertically meshed with the umbrella - shaped driven gear on the spline shaft to realize variable transmission, so that the upper workpiece rotating shaft and the lower workpiece rotating shaft connected to the spline shaft rotate synchronously. At the same time, by using the telescopic structure of the spline shaft, while the upper workpiece rotating shaft and the lower workpiece rotating shaft rotate synchronously, the upper and lower fixtures move towards each other to clamp the workpiece.

[0075] The use of the slewing bearing with both an internal gear ring and an external gear ring makes the motion control mechanism of the workpiece clamping assembly for the polishing machine of the present invention simpler, more compact, smaller in volume, higher in precision, and better in synchronism compared with the prior art.

[0076] The above is only the preferred embodiment of the present invention, and is not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should fall within the technical scope of the present invention.

Claims

1. The application of a slewing bearing in a motion control structure of a workpiece clamping assembly in a polishing machine, characterized in that: The slewing bearing includes an internal gear ring (1), an external gear ring (2) and rolling elements. A first engaging tooth (3) is provided on the inner side of the internal gear ring (1), and a second engaging tooth (4) is provided on the outer side of the external gear ring (2). An annular groove is provided on the outer side of the internal gear ring (1) and the corresponding inner side of the external gear ring (2). The annular groove on the outer side of the internal gear ring (1) and the annular groove on the inner side of the external gear ring (2) together form a raceway for arranging the rolling elements. The internal gear ring (1) and the external gear ring (2) are connected through the rolling elements so as to be relatively rotatable. The motion control mechanism of the workpiece clamping assembly for the polishing machine includes a clamping assembly, a combined bearing and a power mechanism. The combined bearing includes a slewing bearing provided with an internal gear ring and an external gear ring, and a planetary driving gear and a planetary driven gear arranged on a planetary support within the internal gear ring. The planetary driving gear meshes with the planetary driven gear, and the planetary driven gear meshes with the internal gear ring. An umbrella-shaped driving gear is arranged on the planetary support. The power mechanism includes a first driving motor and a second driving motor. The output shaft of the first driving motor is connected to a main driving gear, and the main driving gear meshes with the external gear ring. The output shaft of the second driving motor is connected to the planetary driving gear. The clamping assembly includes a bracket and a telescopic driving shaft. The bracket is connected to the external gear ring. Upper and lower clamps that can slide relatively are respectively arranged at both ends of the bracket. An upper workpiece rotating shaft is arranged on the upper clamp, and a lower workpiece rotating shaft is arranged on the lower clamp. The telescopic driving shaft is provided with an umbrella-shaped driven gear, and the umbrella-shaped driving gear meshes with the umbrella-shaped driven gear to drive the umbrella-shaped driven gear to rotate, and further drive the telescopic driving shaft to rotate. The telescopic driving shaft respectively drives the upper workpiece rotating shaft and the lower workpiece rotating shaft to rotate synchronously. The bracket is provided with a sliding device for driving the upper clamp and the lower clamp to slide on the bracket.

2. The motion control structure of the slewing bearing according to claim 1 when applied to the workpiece clamping assembly in a polishing machine, characterized in that: The external gear ring (2) includes a first external gear ring (21) and a second external gear ring (22) fixedly connected. Annular recesses are provided on the opposite inner sides of the inner side of the first external gear ring (21) and the inner side of the second external gear ring (22). The annular recess on the inner side of the first external gear ring (21) and the annular recess on the inner side of the second external gear ring (22) together form the annular groove on the inner side of the external gear ring (2).

3. The motion control structure of the slewing bearing according to claim 2 when applied to the workpiece clamping assembly in a polishing machine, characterized in that: The first external gear ring (21) and the second external gear ring (22) are fixed by fasteners.

4. The motion control structure of the slewing bearing according to claim 1 when applied to the workpiece clamping assembly in a polishing machine, characterized in that: The rolling elements are balls (5), and the cross-sections of the annular grooves provided on the outer side of the internal gear ring (1) and the corresponding inner side of the external gear ring (2) are both the same semi-circular shape.

5. The motion control structure of the slewing bearing applied to the workpiece clamping assembly in the polishing machine according to claim 1, characterized in that: The rolling elements are rollers (6), and the cross-sections of the annular grooves provided on the outer side of the internal gear ring (1) and the corresponding inner side of the external gear ring (2) are both the same isosceles right angles.

6. A manufacturing method of the slewing bearing according to claim 1, characterized in that: The manufacturing steps of the internal gear ring (1) are as follows: Take a metal ring, machine an annular groove on the outer peripheral surface of the metal ring, and machine the first meshing teeth (3) on the inner hole surface of the metal ring; The manufacturing steps of the external gear ring (2) are as follows: Take two metal rings, drill holes at the same positions of the two metal rings, fasten the two metal rings together through the holes with fasteners, take the joint of the two metal rings as the center line, machine annular grooves in the inner holes of the two metal rings, and machine the second meshing teeth (4) on the outer peripheries of the two metal rings. The two metal rings are made into a first external gear ring (21) and a second external gear ring (22); The installation steps of the slewing bearing are as follows: Place the internal gear ring (1) in the installation tool, sleeved with the first external gear ring (21) or the second external gear ring (22) outside the internal gear ring (1), place the rolling elements in the annular groove at the joint of the internal gear ring (1) and the first external gear ring (21) or the second external gear ring (22), then cover the second external gear ring (22) or the first external gear ring (21) on the first external gear ring (21) or the second external gear ring (22), and fasten the first external gear ring (21) or the second external gear ring (22) with fasteners.

7. The manufacturing method of the slewing bearing according to claim 6, characterized in that: After the internal gear ring (1) is manufactured, heat treatment is performed on the outer peripheral annular groove and the first meshing teeth (3) of the internal gear ring (1); after the first external gear ring (21) or the second external gear ring (22) is manufactured, heat treatment is performed on the inner hole annular groove and the second meshing teeth (4) of the first external gear ring (21) and the second external gear ring (22).

8. The manufacturing method of the slewing bearing according to claim 6, characterized in that: During the manufacturing process of the external gear ring (2), after fastening the two metal rings together through the holes with fasteners, a positioning hole is machined, and then a positioning pin is installed in the positioning hole; during the installation process of the slewing bearing, the first external gear ring (21) or the second external gear ring (22) is fastened with the positioning pin and the fasteners.

9. The manufacturing method of the slewing bearing according to claim 6, characterized in that: During the installation process of the slewing bearing, the rolling elements are balls (5), and the cross-sections of the annular grooves provided on the outer side of the internal gear ring (1) and the corresponding inner side of the external gear ring (2) are both the same semi-circular shapes.

10. The manufacturing method of the slewing bearing according to claim 6, characterized in that: During the installation process of the slewing bearing, the rolling elements are rollers (6), and the cross-sections of the annular grooves provided on the outer side of the internal gear ring (1) and the corresponding inner side of the external gear ring (2) are both the same isosceles right angles.

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