Direct drive turntable

Abstract

This application relates to the field of CNC machining and manufacturing technology, and proposes a direct-drive rotary table, including: a first axis assembly and a second axis assembly. The first axis assembly includes a first rotor and a first stator. The first rotor includes a first shaft and a first bearing. The first bearing and the first shaft are constructed as a first rotating member with an integral structure. The first rotating member is rotatably engaged with the first stator. The second axis assembly includes a second rotor and a second stator. The second rotor includes a second shaft and a second bearing. The second bearing and the second shaft are constructed as a second rotating member with an integral structure. The second rotating member is rotatably engaged with the second stator, and the second stator is provided with a first connecting portion. The first connecting portion is connected to the first rotating member. The first rotating member rotates relative to the first stator to drive the second axis assembly to oscillate. Using the above-described direct-drive rotary table is beneficial to improving product processing yield.

Description

Technical Field

[0001] This application relates to the field of CNC machining and manufacturing technology, and in particular to a direct-drive rotary table. Background Technology

[0002] In the field of five-axis CNC machine tools, the rotary table is a core functional component for machining complex curved surfaces, and its transmission and positioning accuracy directly determines the final workpiece machining quality. Currently, direct drive motors have become the commonly used drive form for high-precision five-axis rotary tables due to their significant advantages such as high dynamic response, high rigidity, and no transmission chain wear.

[0003] However, the performance advantages of direct-drive motors primarily rely on their manufacturing and assembly precision. These motors typically consist of highly integrated core components such as stators, rotors, encoders, and precision bearings, resulting in a complex structure. During assembly, the coaxiality, end-face runout, and air gap uniformity of these key components are prone to accumulating errors that are difficult to completely avoid. These errors directly affect the positioning and motion accuracy of the turntable, leading to a decrease in the yield of processed products. Summary of the Invention

[0004] In view of this, this application provides a direct-drive rotary table to improve product processing yield.

[0005] One embodiment of this application provides a direct-drive rotary table. The direct-drive rotary table includes a first shaft assembly and a second shaft assembly. The first shaft assembly includes a first rotor and a first stator. The first rotor includes a first shaft and a first bearing. The first bearing and the first shaft are configured as a first rotating member with an integral structure. The first rotating member is rotatably engaged with the first stator. The second shaft assembly includes a second rotor and a second stator. The second rotor includes a second shaft and a second bearing. The second bearing and the second shaft are configured as a second rotating member with an integral structure. The second rotating member is rotatably engaged with the second stator. The second stator has a first connecting portion. The first connecting portion is connected to the first rotating member. The first rotating member rotates relative to the first stator to drive the second shaft assembly to oscillate.

[0006] This application provides a direct-drive rotary table. By constructing a first rotating component with a first bearing and a first shaft as an integral structure, and a second rotating component with a second bearing and a second shaft as an integral structure, assembly errors between the shaft and bearing during the assembly of the direct-drive rotary table can be reduced. Furthermore, by providing a first connecting portion on the second stator and constructing the first connecting portion and the second stator as an integral structure, assembly errors are further reduced, ensuring the positioning accuracy and motion accuracy of the direct-drive rotary table, and improving the yield of processed products.

[0007] In some embodiments of this application, the first shaft assembly further includes a third bearing and a first fixing member. The first stator has a groove at one end opposite to the second shaft assembly. The third bearing is sleeved on the end of the first rotating member opposite to the second shaft assembly, and the first end face of the third bearing abuts against the bottom surface of the groove. The first fixing member is sleeved on the first rotating member and abuts against the second end face of the third bearing to position the third bearing.

[0008] In some embodiments of this application, the outer peripheral surface of the end of the first rotating member away from the second shaft assembly is provided with a first stepped portion, the groove and the first stepped portion form a first receiving cavity, the third bearing is located in the first receiving cavity, and the first end face abuts against the first stepped surface of the first stepped portion.

[0009] In some embodiments of this application, the first fixing member includes a limiting member and a positioning member. The limiting member is located between the positioning member and the third bearing, and the limiting member abuts against the second end face. The positioning member abuts against the limiting member and is fixedly connected to the first stator.

[0010] In some embodiments of this application, the first stator is provided with a mounting groove at one end near the second shaft assembly, and the first rotating member is provided with a positioning part at one end near the second shaft assembly. The positioning part is accommodated in the mounting groove and is used to define the relative position of the first rotor and the first stator.

[0011] In some embodiments of this application, the first shaft assembly further includes: an encoder and a leveling member, the first stator having a receiving space, the encoder and the leveling member being located within the receiving space; the encoder includes a movable grid and a stationary grid that are rotatable relative to each other, the movable grid being sleeved on the first rotating member and fixedly connected to the positioning member, the stationary grid being mounted in the receiving space via the leveling member, the leveling member being sleeved on the stationary grid and located between the stationary grid and the inner wall surface of the receiving space; wherein, the leveling member is fixedly connected to the stationary grid and is used to move within the receiving cavity to drive the stationary grid to move.

[0012] In some embodiments of this application, the direct drive turntable further includes: a base and a fixed seat, the first shaft assembly and the fixed seat are spaced apart on the base along a first direction, the second stator is further provided with a second connecting portion, the second connecting portion and the first connecting portion are respectively located on both sides of the second axis of the second shaft, and the second connecting portion is rotatably connected to the fixed seat.

[0013] In some embodiments of this application, the second shaft assembly further includes a fourth bearing and a second fixing member. The second stator has a recess at one end near the base. The fourth bearing is sleeved on the second rotating member, and the first end face of the fourth bearing abuts against the bottom surface of the recess. The second fixing member is sleeved on the second rotating member and abuts against the second end face of the fourth bearing to position the fourth bearing.

[0014] In some embodiments of this application, the second shaft assembly further includes: an air blowing member disposed on the second stator, having a nozzle orifice, the second stator having a first channel communicating with the nozzle orifice; a connecting member, the connecting member being sleeved on the end of the second rotating member opposite to the base and fixedly connected to the second stator, the connecting member having a first receiving groove and a second receiving groove isolated from each other, the connecting member having a second channel and a third channel communicating with the outside; and an oil seal member, sleeved on the second rotating member and located in the first receiving groove; wherein the first channel, the second channel, the second receiving groove and the third channel are sequentially connected to form an air blowing channel, and the air blowing member is used to blow air from the nozzle orifice toward the air blowing channel to prevent liquid medium from flowing into the first receiving groove.

[0015] In some embodiments of this application, the second stator has a slot at one end away from the base, and the second rotating member has a positioning protrusion at one end away from the base. The positioning protrusion is accommodated in the slot and abuts against the bottom surface of the slot and the connecting member, thereby defining the relative position of the second rotor and the second stator. Attached Figure Description

[0016] Figure 1 This is a perspective view of a direct-drive rotary table in one embodiment of this application.

[0017] Figure 2 This is a cross-sectional view of a direct-drive rotary table in one embodiment of this application.

[0018] Figure 3 This is a partial exploded view of the first axis assembly of a direct-drive rotary table in one embodiment of this application.

[0019] Figure 4 for Figure 3 Another visual schematic diagram of the first axis assembly of the direct drive turntable.

[0020] Figure 5 This is a partial exploded view of the second axis assembly of a direct-drive rotary table in one embodiment of this application.

[0021] Figure 6 for Figure 5 Another visual schematic diagram of the second axis assembly of the direct drive turntable.

[0022] Figure 7 for Figure 1 A partial sectional view of the second axis assembly of a direct-drive rotary table.

[0023] Explanation of main component symbols 100-Direct drive rotary table; 10-First shaft assembly; 11-First rotor; 110-First shaft; 111-First bearing; 112-First rotating component; 1120-First stepped portion; 11200-First stepped surface; 1121-First accommodating cavity; 1122-Positioning part; 12-First stator; 120-Groove; 121-Mounting slot; 122-Accommodating space; 13-Third bearing; 14-First fixing component; 140-Limiting component; 141-Positioning component; 15-Encoder; 150-Moving grid; 151-Stabilizing grid; 16-Leveling component; 20-Second shaft assembly; 21-Second rotor; 210-Second shaft; 211-Second bearing; 212-Second rotating component; 2120-Positioning protrusion; 2121-Second stepped portion Part; 21210-Second stepped surface; 2122-Second receiving cavity; 22-Second stator; 220-First connecting part; 221-Second connecting part; 222-Recess; 223-First channel; 224-Slot; 225-Mounting cavity; 23-Fourth bearing; 24-Second fixing part; 240-Limiting unit; 241-Positioning unit; 25-Blowing part; 250-Nozzle; 26-Connecting part; 261-First receiving groove; 262-Second receiving groove; 263-Second channel; 264-Third channel; 27-Oil seal; 28-Encoding unit; 280-Moving grid unit; 281-Stabilizing grid unit; 29-Leveling unit; 30-Base; 40-Fixing seat; 50-Gasket; 51-Ventilation groove; 52-Air chamber.

[0024] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0027] In the field of five-axis CNC machine tools, the rotary table is a core functional component for machining complex curved surfaces, and its transmission and positioning accuracy directly determines the final workpiece machining quality. Currently, direct drive motors have become the commonly used drive form for high-precision five-axis rotary tables due to their significant advantages such as high dynamic response, high rigidity, and no transmission chain wear.

[0028] However, the performance advantages of direct-drive motors primarily rely on their manufacturing and assembly precision. These motors typically consist of highly integrated core components such as stators, rotors, encoders, and precision bearings, resulting in a complex structure. During assembly, the coaxiality, end-face runout, and air gap uniformity of these key components are prone to accumulating errors that are difficult to completely avoid. These errors directly affect the positioning and motion accuracy of the turntable, leading to a decrease in the yield of processed products.

[0029] Therefore, to solve the above problems, one embodiment of this application proposes a direct-drive rotary table. The direct-drive rotary table includes a first shaft assembly and a second shaft assembly. The first shaft assembly includes a first rotor and a first stator. The first rotor includes a first shaft and a first bearing. The first bearing and the first shaft are configured as a first rotating member with an integral structure. The first rotating member is rotatably engaged with the first stator. The second shaft assembly includes a second rotor and a second stator. The second rotor includes a second shaft and a second bearing. The second bearing and the second shaft are configured as a second rotating member with an integral structure. The second rotating member is rotatably engaged with the second stator. The second stator is provided with a first connecting portion. The first connecting portion is connected to the first rotating member. The first rotating member rotates relative to the first stator to drive the second shaft assembly to oscillate.

[0030] This application provides a direct-drive rotary table. By constructing a first rotating component with a first bearing and a first shaft as an integral structure, and a second rotating component with a second bearing and a second shaft as an integral structure, assembly errors between the shaft and bearing during the assembly of the direct-drive rotary table can be reduced. Furthermore, by providing a first connecting portion on the second stator and constructing the first connecting portion and the second stator as an integral structure, assembly errors are further reduced, ensuring the positioning accuracy and motion accuracy of the direct-drive rotary table, and improving the yield of processed products.

[0031] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] Please also refer to Figures 1 to 7One embodiment of this application provides a direct-drive rotary table 100. The direct-drive rotary table 100 includes a first shaft assembly 10 and a second shaft assembly 20. The first shaft assembly 10 includes a first rotor 11 and a first stator 12. The first rotor 11 includes a first shaft 110 and a first bearing 111. The first bearing 111 and the first shaft 110 are configured as a first rotating member 112 with an integral structure. The first rotating member 112 is rotatably engaged with the first stator 12. The second shaft assembly 20 includes a second rotor 21 and a second stator 22. The second rotor 21 includes a second shaft 210 and a second bearing 211. The second bearing 211 and the second shaft 210 are configured as a second rotating member 212 with an integral structure. The second rotating member 212 is rotatably engaged with the second stator 22. The second stator 22 is provided with a first connecting portion 220. The first connecting portion 220 is connected to the first rotating member 112. The first rotating member 112 rotates relative to the first stator 12 to drive the second shaft assembly 20 to oscillate via the first connecting portion 220.

[0033] By constructing the first bearing 111 and the first shaft 110 as a single-piece rotating component 112, and by constructing the second bearing 211 and the second shaft 210 as a single-piece rotating component 212, assembly errors between the shaft and bearing during the assembly of the direct-drive rotary table 100 can be reduced. Furthermore, by providing a first connecting portion 220 on the second stator 22 and constructing the first connecting portion 220 and the second stator 22 as a single-piece structure, assembly errors are further reduced, ensuring the positioning and motion accuracy of the direct-drive rotary table 100 and improving the yield of processed products.

[0034] In some embodiments of this application, it is understood that the first axis assembly 10 is the A-axis assembly of the five-axis direct-drive rotary table 100, and the second axis assembly 20 is the C-axis assembly of the five-axis direct-drive rotary table 100, with the product mounted on the C-axis assembly. During actual product processing, the A-axis assembly drives the C-axis assembly to swing, adjusting the product's tilt relative to the cutting tool. The C-axis assembly is used to position the product in the horizontal plane to complete multi-station connected processing.

[0035] Further integration Figures 2 to 4 As shown, the first shaft assembly 10 also includes a third bearing 13 and a first fixing member 14. A groove 120 is provided at the end of the first stator 12 facing away from the second shaft assembly 20. The third bearing 13 is sleeved on the first rotating member 112, and the first end face of the third bearing 13 abuts against the bottom surface of the groove 120. The first fixing member 14 is sleeved on the first rotating member 112 and abuts against the second end face of the third bearing 13 to position the third bearing 13.

[0036] In some embodiments of this application, due to the relatively long length of the first rotating member 112, the end of the first rotating member 112 facing away from the second shaft assembly 20 may wobble during the rotation of the first rotor 11 relative to the first stator 12, i.e., the tail of the first rotating member 112 may wobble, resulting in low motion accuracy of the direct drive turntable 100. In this embodiment, by sleeved with a third bearing 13 at the tail of the first rotating member 112, the third bearing 13 provides support for the tail of the first rotating member 112, reducing the wobble at the tail of the first rotating member 112, improving the stability of the rotation process of the first rotating member 112, and thus improving the motion accuracy of the direct drive turntable 100.

[0037] In some embodiments of this application, the bottom surface of the groove 120 of the first stator 12 and the first fixing member 14 are used to jointly position the third bearing 13, which effectively constrains the axial degree of freedom of the third bearing 13 and improves the rotational stability of the first rotating member 112.

[0038] In some embodiments of this application, the outer peripheral surface of the first rotating member 112 opposite to the second shaft assembly 20 is provided with a first stepped portion 1120. The groove 120 and the first stepped portion 1120 form a first receiving cavity 1121. The third bearing 13 is located in the first receiving cavity 1121, and its first end face abuts against the first stepped surface 11200 of the first stepped portion 1120.

[0039] In some embodiments of this application, by utilizing the first stepped surface 11200 of the first rotating member 112 and the bottom surface of the groove 120 of the first stator 12 to jointly form the axial positioning reference of the third bearing 13, additional positioning parts are reduced and the assembly complexity is lowered. At the same time, by utilizing the relative structure of the first rotating member 112 and the first stator 12, the stability of the preload of the third bearing 13 can be maintained, thereby improving the motion accuracy of the direct drive turntable 100.

[0040] In some embodiments of this application, the first fixing member 14 includes a limiting member 140 and a positioning member 141. The limiting member 140 is located between the positioning member 141 and the third bearing 13, and the limiting member 140 abuts against the second end face. The positioning member 141 abuts against the limiting member 140 and is fixedly connected to the first stator 12.

[0041] In some embodiments of this application, by setting a limiting member 140, the first axial gap between the limiting member 140 and the third bearing 13 and the second axial gap between the limiting member 140 and the positioning member 141 provide axial compensation space for the thermal expansion of the first rotating member 112 and the first stator 12, thereby avoiding overload or failure of the preload of the third bearing 13 due to temperature rise, and ensuring the accuracy and stability of the direct drive turntable 100 under long-term high-speed operation.

[0042] Understandably, by configuring the size of the first axial clearance to be greater than or equal to the thermal expansion of the first rotor 11, and the size of the second axial clearance to be greater than or equal to the thermal expansion of the first stator 12, damage to the third bearing 13 is avoided. Specifically, the first rotating member 112 expands due to heat during rotation, pushing the third bearing 13. By configuring the size of the first axial clearance to be greater than or equal to the thermal expansion of the first rotor 11, the third bearing 13 can be prevented from being squeezed. The first stator 12 also expands axially due to heat, pushing the positioning member 141. By configuring the second axial clearance, a clearance space is provided for the expansion of the first stator 12, preventing the expansion of the first stator 12 from causing damage to the third bearing 13.

[0043] In some other embodiments, the limiting member 140 and the positioning member 141 can be constructed as an integrated structure, which helps to further reduce assembly errors.

[0044] In some embodiments of this application, the first stator 12 has a mounting groove 121 at one end near the second shaft assembly 20. The first rotating member 112 has a positioning part 1122 at one end near the second shaft assembly 20. The positioning part 1122 is accommodated in the mounting groove 121 and is used to define the relative position of the first rotor 11 and the first stator 12.

[0045] In some embodiments of this application, by providing a positioning part 1122 on the first rotating member 112, the first rotor 11 and the first stator 12 are precisely positioned during assembly, providing a high-precision installation reference for installing the second stator 22 and the second rotor 21. With this design, the flatness and perpendicularity correction of the second stator 22 can be directly based on this reference, eliminating the need for repeated reliance on external calibration equipment for alignment, simplifying the assembly steps, and significantly reducing the assembly time of the direct-drive turntable 100.

[0046] In some embodiments of this application, the ends of the first shaft 110 and the first bearing 111 that are configured as an integrated structure constitute the positioning part 1122 provided on the first rotating member 112, eliminating the need to set the positioning part 1122 separately and reducing assembly errors.

[0047] In some embodiments of this application, the first shaft assembly 10 further includes an encoder 15 and a leveling member 16. The first stator 12 has a receiving space 122. The encoder 15 and the leveling member 16 are located within the receiving space 122. The encoder 15 includes a movable grid 150 and a stationary grid 151 that are rotatable relative to each other. The movable grid 150 is sleeved on the first rotating member 112 and fixedly connected to the positioning member 141. The stationary grid 151 is mounted in the receiving space 122 via the leveling member 16, which is sleeved on the stationary grid 151 and located between the stationary grid 151 and the inner wall surface of the receiving space 122. The leveling member 16 is fixedly connected to the stationary grid 151 and is used to move within the receiving cavity to move the stationary grid 151.

[0048] In some embodiments of this application, the stationary grid 151 is installed via the leveling component 16. Firstly, during the assembly stage, the position and orientation of the stationary grid 151 can be precisely set by adjusting the leveling component 16, achieving calibration during assembly and greatly improving assembly accuracy and efficiency. Secondly, in subsequent use, if either the stationary grid 151 or the leveling component 16 requires maintenance, it can be replaced independently, improving disassembly and assembly efficiency. Finally, the entire assembly and adjustment process is completed entirely on the leveling component 16, avoiding direct contact and operation with the stationary grid 151, ensuring the safety of the encoder 15, and thus improving the reliability of measurements with the direct-drive turntable 100.

[0049] In some embodiments of this application, the direct-drive turntable 100 further includes a base 30 and a fixed seat 40. The first shaft assembly 10 and the fixed seat 40 are spaced apart on the base 30 along a first direction. The second stator 22 is also provided with a second connecting portion 221, which is located on both sides of the second axis of the second shaft 210, and the second connecting portion 221 is rotatably connected to the fixed seat 40.

[0050] In some embodiments of this application, the first shaft assembly 10 and the second shaft assembly 20 are supported by a base 30 and a fixed seat 40, and the first connecting part 220 and the second connecting part 221 are symmetrically arranged on both sides of the second axis. This symmetrical structure allows the force to be evenly transmitted to the base 30 and the fixed seat 40 along two symmetrical force flow paths when subjected to external loads, thereby eliminating the additional off-center load moment that may be caused by the asymmetrical layout of the support points, improving the rigidity and stability of the direct drive turntable 100, and thus improving the yield of processed products.

[0051] Further integration Figure 5 and Figure 6 The second shaft assembly 20 also includes a fourth bearing 23 and a second fixing member 24. The second stator 22 has a recess 222 at one end near the base 30. The fourth bearing 23 is sleeved on the second rotating member 212, and the first end face of the fourth bearing 23 abuts against the bottom surface of the recess 222. The second fixing member 24 is sleeved on the second rotating member 212 and abuts against the second end face of the fourth bearing 23 to position the fourth bearing 23.

[0052] In some embodiments of this application, due to the relatively long length of the second rotating member 212, the end of the second rotating member 212 near the base 30 may wobble during the rotation of the second rotor 21 relative to the second stator 22, i.e., the tail of the second rotating member 212 may wobble, resulting in low motion accuracy of the direct drive turntable 100. In this embodiment, by sleeved with a fourth bearing 23 at the tail of the second rotating member 212, the fourth bearing 23 provides support for the tail of the second rotating member 212, reducing the wobble at the tail of the second rotating member 212, improving the stability of the rotation process of the second rotating member 212, and thus improving the motion accuracy of the direct drive turntable 100.

[0053] In some embodiments of this application, the fourth bearing 23 is co-positioned by the bottom surface of the recess 222 of the second stator 22 and the second fixing member 24, which effectively constrains the axial degree of freedom of the fourth bearing 23 and improves the rotational stability of the second rotating member 212.

[0054] In some embodiments of this application, the outer peripheral surface of the second rotating member 212 near the base 30 is provided with a second stepped portion 2121. A recess 222 is formed with the second stepped portion 2121. A fourth bearing 23 is located inside, and the first end face of the fourth bearing 23 abuts against the second stepped surface 21210 of the second stepped portion 2121.

[0055] In some embodiments of this application, by utilizing the second stepped surface 21210 of the second rotating member 212 and the bottom surface of the recess 222 of the second stator 22 to jointly form the axial positioning reference of the fourth bearing 23, additional positioning parts are reduced and the assembly complexity is lowered. At the same time, by utilizing the relative structure of the second rotating member 212 and the second stator 22, the stability of the preload of the fourth bearing 23 can be maintained, thereby improving the motion accuracy of the direct drive turntable 100.

[0056] In some embodiments of this application, the second fixing member 24 includes a limiting unit 240 and a positioning unit 241. The limiting unit 240 is located between the positioning unit 241 and the fourth bearing 23, and the limiting unit 240 abuts against the second end face of the fourth bearing 23. The positioning unit 241 abuts against the limiting unit 240 and is fixedly connected to the second stator 22.

[0057] In some embodiments of this application, by setting a limiting unit 240, the third axial gap between the limiting unit 240 and the fourth bearing 23 and the fourth axial gap between the limiting unit 240 and the positioning unit 241 provide axial compensation space for the thermal expansion of the second rotating member 212 and the second stator 22, thereby avoiding overload or failure of the preload of the fourth bearing 23 due to temperature rise, and ensuring the accuracy and stability of the direct drive turntable 100 under long-term high-speed operation.

[0058] Understandably, by configuring the third axial clearance to be greater than or equal to the thermal expansion of the second rotor 21, and the fourth axial clearance to be greater than or equal to the thermal expansion of the second stator 22, damage to the fourth bearing 23 is avoided. Specifically, the second rotating member 212 expands due to heat during rotation, pushing the fourth bearing 23. By configuring the third axial clearance to be greater than or equal to the thermal expansion of the second rotor 21, the fourth bearing 23 can be prevented from being squeezed. The second stator 22 also expands axially due to heat, pushing the positioning unit 241. By configuring the fourth axial clearance, a clearance space is provided for the expansion of the second stator 22, preventing the expansion of the second stator 22 from damaging the fourth bearing 23.

[0059] In some other embodiments, the limiting unit 240 and the positioning unit 241 can be constructed as an integrated structure, which helps to further reduce assembly errors.

[0060] Further integration Figure 7 As shown, the second shaft assembly 20 further includes: an air blowing element 25, a connecting element 26, and an oil seal 27. The air blowing element 25 is disposed on one side of the second stator 22. The air blowing element 25 has a nozzle orifice 250. The second stator 22 has a first channel 223 communicating with the nozzle orifice 250. The connecting element 26 is sleeved on the end of the second rotating member 212 facing away from the base 30 and is fixedly connected to the second stator 22. The connecting element 26 has a first receiving groove 261 and a second receiving groove 262 that are isolated from each other. The connecting element 26 has a second channel 263 and a third channel 264 communicating with the outside. The oil seal 27 is sleeved on the second rotating member 212 and located in the first receiving groove 261. The first channel 223, the second channel 263, the second receiving groove 262, and the third channel 264 are sequentially connected to form an air blowing channel. The air blowing element 25 is used to blow air from the nozzle orifice 250 toward the air blowing channel until the gas is blown to the outside (e.g., Figure 7 (Gas flow direction) to prevent liquid medium from flowing into the first accommodating tank 261.

[0061] In some embodiments of this application, by providing the air blowing component 25, liquid medium can be prevented from flowing into the first receiving tank 261, thereby ensuring that the working environment of the oil seal component 27 in the first receiving tank 261 is clean and dry, avoiding problems such as seal failure, lubrication dilution, component corrosion and electrical short circuit caused by the inflow of liquid medium, improving the operational stability of the direct drive turntable 100, and thus improving the yield of processed products.

[0062] In some embodiments of this application, the direct-drive turntable 100 further includes a gasket 50, which is sleeved on the end of the second rotating member 212 opposite to the base 30 and located within the second receiving groove 262. The gasket 50 has a vent groove 51, which communicates with the second receiving groove 262 to form an air chamber 52. Air is blown through the nozzle 250 toward the air blowing channel, forming an air curtain within the air chamber 52, further preventing liquid media or impurities from flowing into the first receiving groove 261 and affecting the performance of the oil seal 27.

[0063] In some embodiments of this application, the second stator 22 has a slot 224 at one end opposite to the base 30. The second rotating member 212 has a positioning protrusion 2120 at one end opposite to the base 30. The positioning protrusion 2120 is accommodated in the slot 224 and abuts against the bottom surface of the slot 224 and the connecting member 26, for defining the relative position of the second rotor 21 and the second stator 22.

[0064] In some embodiments of this application, by providing a positioning protrusion 2120 on the second rotating member 212, a high-precision installation reference is provided for installing the second stator 22 and the second rotor 21, eliminating the need to rely on external adjustment equipment for alignment, simplifying the assembly steps, and significantly reducing the assembly time of the direct drive turntable 100.

[0065] In some embodiments of this application, the end of the integrated structure formed by the second shaft 210 and the second bearing 211 constitutes the positioning protrusion 2120 provided on the first rotating member 112, eliminating the need to separately provide the positioning protrusion 2120 and reducing assembly errors.

[0066] In some embodiments of this application, the second shaft assembly 20 further includes an encoding unit 28 and a leveling unit 29. The second stator 22 has a mounting cavity 225. The encoding unit 28 and the leveling unit 29 are located within the mounting cavity 225. The encoding unit 28 includes a movable grid 150 unit and a stationary grid 151 unit that are rotatable relative to each other. The movable grid 150 unit is sleeved on the second rotating member 212 and fixedly connected to the positioning unit 241. The stationary grid 151 unit is mounted in the mounting cavity 225 via the leveling unit 29, which is sleeved on the stationary grid 151 unit and located between the stationary grid 151 unit and the inner wall surface of the mounting cavity 225. The leveling unit 29 is fixedly connected to the stationary grid 151 unit and is used to move within the mounting cavity 225 to drive the stationary grid 151 unit to move, thereby achieving leveling.

[0067] In some embodiments of this application, the stationary grid 151 unit is installed via the leveling unit 29. Firstly, during the assembly stage, the position and orientation of the stationary grid 151 unit can be precisely set by adjusting the leveling unit 29, achieving calibration during assembly and greatly improving assembly accuracy and efficiency. Secondly, in subsequent use, if either the stationary grid 151 unit or the leveling unit 29 requires maintenance, it can be independently replaced, improving disassembly and assembly efficiency. Finally, the entire assembly and adjustment process is completed entirely on the leveling unit 29, avoiding direct contact and operation of the stationary grid 151 unit, ensuring the safety of the encoding unit 28, and thus improving the reliability of measurements with the direct-drive turntable 100.

[0068] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and substance of the technical solutions of this application.

Claims

1. A direct drive rotary table, characterized by, The direct-drive rotary table includes: The first shaft assembly includes a first rotor and a first stator that cooperate with each other. The first rotor includes a first shaft and a first bearing. The first bearing and the first shaft are configured as a first rotating member with an integral structure. The first rotating member is rotatably engaged with the first stator. The second shaft assembly includes a second rotor and a second stator that cooperate with each other. The second rotor includes a second shaft and a second bearing. The second bearing and the second shaft are configured as a second rotating member with an integral structure. The second rotating member is rotatably engaged with the second stator. The second stator is provided with a first connecting part, which is connected to the first rotating member. The first rotating member rotates relative to the first stator to drive the second shaft assembly to swing through the first connecting part.

2. The direct drive rotary table of claim 1, wherein, The first shaft assembly further includes a third bearing and a first fixing member. The first stator has a groove at one end away from the second shaft assembly. The third bearing is sleeved on the end of the first rotating member away from the second shaft assembly, and the first end face of the third bearing abuts against the bottom surface of the groove. The first fixing member is sleeved on the first rotating member and abuts against the second end face of the third bearing to position the third bearing.

3. The direct drive rotary table of claim 2, wherein, The outer peripheral surface of the first rotating member opposite to the second shaft assembly is provided with a first stepped portion, the groove and the first stepped portion form a first receiving cavity, the third bearing is located in the first receiving cavity, and the first end face abuts against the first stepped surface of the first stepped portion.

4. The direct drive rotary table of claim 2, wherein, The first fixing member includes a limiting member and a positioning member. The limiting member is located between the positioning member and the third bearing, and the limiting member abuts against the second end face. The positioning member abuts against the limiting member and is fixedly connected to the first stator.

5. The direct drive rotary table of claim 1, wherein, The first stator has a mounting groove at one end near the second shaft assembly, and the first rotating member has a positioning part at one end near the second shaft assembly. The positioning part is accommodated in the mounting groove and is used to define the relative position of the first rotor and the first stator.

6. The direct drive rotary table of claim 4, wherein, The first shaft assembly further includes an encoder and a leveling component, the first stator having a receiving space, the encoder and the leveling component being located within the receiving space; The encoder includes a movable grid and a stationary grid that can rotate relative to each other. The movable grid is sleeved on the first rotating member and fixedly connected to the positioning member. The stationary grid is installed in the accommodating space through the leveling member. The leveling member is sleeved on the stationary grid and located between the stationary grid and the inner wall surface of the accommodating space. The leveling component is fixedly connected to the stationary grid and is used to move within the accommodating cavity to drive the stationary grid to move.

7. The direct drive rotary table of claim 1, wherein, The direct-drive rotary table also includes: The base and the fixed seat are arranged at intervals along a first direction on the base. The second stator is also provided with a second connecting part. The second connecting part and the first connecting part are respectively located on both sides of the second axis of the second shaft, and the second connecting part is rotatably connected to the fixed seat.

8. The direct drive rotary table of claim 7, wherein, The second shaft assembly further includes a fourth bearing and a second fixing member. The second stator has a recess at one end near the base. The fourth bearing is sleeved on the second rotating member, and the first end face of the fourth bearing abuts against the bottom surface of the recess. The second fixing member is sleeved on the second rotating member and abuts against the second end face of the fourth bearing to position the fourth bearing.

9. The direct drive rotary table of claim 7, wherein, The second axis assembly also includes: An air blowing component is disposed on the second stator and has a nozzle orifice. The second stator is provided with a first channel communicating with the nozzle orifice. A connector is sleeved on the end of the second rotating member away from the base and fixedly connected to the second stator. The connector has a first receiving groove and a second receiving groove that are isolated from each other. The connector is provided with a second channel and a third channel that communicates with the outside. An oil seal is fitted onto the second rotating member and located in the first receiving groove; The first channel, the second channel, the second accommodating groove, and the third channel are sequentially connected to form an air blowing channel. The air blowing component is used to blow air from the nozzle towards the air blowing channel to prevent liquid medium from flowing into the first accommodating groove.

10. The direct drive rotary table according to any one of claims 7 to 9, wherein, The second stator has a slot at one end away from the base, and the second rotating member has a positioning protrusion at one end away from the base. The positioning protrusion is accommodated in the slot and abuts against the bottom surface of the slot and the connecting member, thereby defining the relative position of the second rotor and the second stator.

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