Small-bore liquid throttling static pressure turntable

Abstract

The present application relates to the technical field of high-precision hydrostatic rotary table, and provides a small-hole liquid throttling type hydrostatic rotary table, which comprises a base, a shell, a driving assembly, a liquid hydrostatic bearing and a table top; the shell is fixedly arranged on the base, and an installation space is formed in the shell; the driving assembly is arranged in the installation space; the liquid hydrostatic bearing is connected with the driving assembly, so that the liquid hydrostatic bearing rotates with the driving assembly; the table top is connected with the liquid hydrostatic bearing, so that the table top is driven to rotate by the liquid hydrostatic bearing; wherein the liquid hydrostatic bearing comprises a flow guide ring, a ball seat and a shaft ball, and the ball seat is provided with a first oil cavity, a second oil cavity and a third oil cavity. In the present application, the first oil cavity, the second oil cavity and the third oil cavity are arranged, so that oil films are formed in the axial direction and the radial direction of the liquid hydrostatic bearing, thereby improving the carrying capacity and the stiffness, and the shaft ball is in a whole semispherical structure, which enables self-centering function in the action process, thereby improving the stability in the action process.

Description

Technical Field

[0001] This invention relates to the technical field of ultra-precision hydrostatic rotary tables, and more particularly to a small-orifice liquid throttling hydrostatic rotary table. Background Technology

[0002] High-precision hydrostatic rotary tables are widely used in precision and ultra-precision four-axis and five-axis machining tools with rotary axes, and are one of the key components of ultra-precision machine tools.

[0003] In some typical solutions, gas static pressure turntables are often used. Compared with traditional rolling bearings, these turntables are frictionless and generate less heat due to the use of high-pressure air as the support medium. However, these types of gas static pressure turntables have poor rigidity and load-bearing capacity, which limits the types of materials that can be processed.

[0004] In other typical solutions, the internal structure of the hydrostatic turntable is complex, and the structure is mostly "I" shaped or double cone shaped. The manufacturing precision requirements of such turntable components are high, and the assembly is difficult. Summary of the Invention

[0005] This invention provides a small-orifice liquid throttling hydrostatic turntable to solve the defects of poor rigidity and load-bearing capacity of existing gas hydrostatic turntables.

[0006] This invention provides a small-orifice liquid throttling hydrostatic rotary table, comprising: a base, a housing, a drive assembly, a liquid hydrostatic bearing, and a table surface; the housing is fixedly mounted on the base and has an installation space; the drive assembly is disposed within the installation space; the liquid hydrostatic bearing is connected to the drive assembly so that the liquid hydrostatic bearing rotates with the drive assembly; the table surface is connected to the liquid hydrostatic bearing so that the table surface is driven to rotate by the liquid hydrostatic bearing; wherein, the liquid hydrostatic bearing comprises: a guide ring, a ball seat, and a shaft ball; the guide ring is fixedly connected to the housing and has a liquid inlet for inputting hydraulic oil; the ball seat is connected to the guide ring and contacts the inner wall surface of the guide ring; an annular guide channel is formed on the outer wall surface of the bottom of the ball seat; the liquid inlet is connected to the guide channel; the top surface of the ball seat contacts the table surface; and the bottom surface of the ball seat contacts the drive assembly. The ball seat has a hollow bowl-shaped mounting cavity in the middle. A liquid flow channel is formed inside the ball seat and communicates with the guide channel. Multiple first oil chambers are arranged around the top surface of the ball seat, forming a first oil film with the platform. Multiple second oil chambers are arranged around the bottom surface of the ball seat, forming a second oil film with the drive assembly. Multiple third oil chambers are arranged around the inner wall of the mounting cavity. Each of the first, second, and third oil chambers communicates with the liquid flow channel. Each of the first, second, and third oil chambers is equipped with a throttle. The axle ball is installed in the mounting cavity. The top of the axle ball is connected to the platform, and the bottom of the axle ball is connected to the drive assembly. A spherical surface is formed on the outer wall of the axle ball, contacting and fitting with the inner wall of the mounting cavity. A third oil film is formed between the spherical surface and the third oil chamber.

[0007] The small-hole liquid throttling hydrostatic rotary table provided by the present invention further includes a cooling assembly, which is disposed within the installation space and located between the drive assembly and the housing.

[0008] According to the small-hole liquid throttling hydrostatic turntable provided by the present invention, the cooling assembly includes a cooling jacket, which is fixedly disposed on the base and located outside the drive assembly. The outer wall surface of the cooling jacket is provided with a cooling channel for coolant flow. The housing is provided with a coolant inlet, which communicates with the cooling channel and is used for inputting coolant.

[0009] According to the small-hole liquid throttling hydrostatic rotary table provided by the present invention, the cooling channel has multiple channels, which are spaced apart in the axial direction, and sealing rings are provided above and below the cooling channels at both ends.

[0010] According to the small-hole liquid throttling hydrostatic rotary table provided by the present invention, the drive assembly includes a stator component, a rotor component and a connecting sleeve. The stator component is fixedly sleeved on the inner wall of the cooling sleeve. The rotor component is located inside the stator component and connected to the connecting sleeve. The connecting sleeve is located on the base and connected to the shaft ball. The top surface of the connecting sleeve and the bottom surface of the ball seat form the second oil film.

[0011] According to the small-hole liquid throttling hydrostatic rotary table provided by the present invention, the drive assembly further includes a connecting shaft and an encoder, the connecting shaft being connected to the connecting sleeve, and the encoder being disposed on the connecting shaft.

[0012] According to the small-hole liquid throttling hydrostatic turntable provided by the present invention, the base has an upwardly protruding portion in the middle to form an assembly space for connecting the connecting shaft and the encoder.

[0013] According to the small-hole liquid throttling hydrostatic rotary table provided by the present invention, an adjusting shim is provided between the shaft ball and the connecting sleeve, and the adjusting shim is located at the bottom of the mounting cavity.

[0014] According to the small-hole liquid throttling hydrostatic rotary table provided by the present invention, a plurality of first oil chambers are evenly spaced on a ring around the top surface of the ball seat, and a first oil return groove is provided between adjacent first oil chambers. An annular first liquid accumulation groove is provided around the top surface of the ball seat near the oil chamber position. An oil return through hole is provided at the bottom of the first liquid accumulation groove. The first oil return groove is connected to the first liquid accumulation groove so that the liquid in the first oil return groove enters the first liquid accumulation groove. A plurality of second oil chambers are evenly spaced on a ring around the bottom surface of the ball seat, and a second oil return groove is provided between adjacent second oil chambers. A second liquid accumulation groove is provided corresponding to the upper part of the housing. The second oil return groove is connected to the second liquid accumulation groove. The first liquid accumulation groove is connected through the oil return through hole. An oil return outlet is provided on the outer wall surface of the housing.

[0015] According to the small-hole liquid throttling hydrostatic turntable provided by the present invention, a retaining ring structure is provided around the top edge of the ball seat.

[0016] This invention provides a small-orifice liquid-throttling hydrostatic turntable. Through the arrangement of a first oil chamber, a second oil chamber, and a third oil chamber, an oil film is formed in both the axial and radial directions of the hydrostatic bearing, thereby improving load-bearing capacity and rigidity. Furthermore, the overall hemispherical structure of the bearing ball enables self-centering during operation, thus enhancing stability. Moreover, compared to I-shaped or double-cone hydrostatic turntables, by setting the hydrostatic bearing to a hemispherical bearing ball and ball seat structure, the manufacturing difficulty of the bearing and the assembly difficulty of the turntable are reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional structural schematic diagram of the small-hole liquid throttling hydrostatic turntable provided by the present invention.

[0019] Figure 2 This is a three-dimensional structural diagram of the ball seat in the small-hole liquid throttling hydrostatic rotary table provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the liquid flow channel in the small-hole liquid throttling static pressure turntable provided by the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the housing in the small-hole liquid throttling hydrostatic turntable provided by the present invention.

[0022] Figure label: 10. Base; 11. Upper protrusion; 20. Housing; 21. Installation space; 22. Second liquid sump; 30. Drive assembly; 31. Stator assembly; 32. Rotor assembly; 33. Connecting sleeve; 34. Encoder; 35. Connecting shaft; 40. Hydrostatic bearing; 41. Guide ring; 42. Ball seat; 420. Installation chamber; 421. Guide channel; 422. Liquid flow channel; 423. Oil return through hole; 424. First oil chamber; 4241. First oil return groove; 425. Second oil chamber; 4251. Second oil return groove; 426. Third oil chamber; 427. First liquid sump; 428. Throttling device; 43. Shaft ball; 50. Platform; 60. Cooling assembly; 61. Cooling sleeve; 62. Cooling channel; 70. Adjusting shim; 80. Retaining ring structure. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0026] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0028] The following is combined with Figures 1-4This invention describes a small-orifice liquid throttling hydrostatic rotary table, comprising a base 10, a housing 20, a drive assembly 30, a liquid hydrostatic bearing 40, and a table 50. The housing 20 is fixedly mounted on the base 10, and an installation space 21 is formed inside the housing 20. The drive assembly 30 is disposed within the installation space 21. The liquid hydrostatic bearing 40 is connected to the drive assembly 30 so that the liquid hydrostatic bearing 40 rotates with the drive assembly 30. The table 50 is connected to the liquid hydrostatic bearing 40 so that the table 50 is driven to rotate through the hydrostatic bearing. The table 50 is used to support components such as machining spindles, which requires the table 50 to have a certain load-bearing capacity. In this example, the support for the table 50 is achieved by using the liquid hydrostatic bearing 40, which improves the load-bearing capacity and rigidity, and can meet the needs of machining more types of materials.

[0029] In a specific configuration, the housing 20 is fixedly connected to the base 10 by bolts, and an installation space 21 for mounting the drive assembly 30 is formed within the internal space of the housing 20. The drive assembly 30 can rotate when powered on, thereby driving the hydrostatic bearing 40 to rotate. The platform 50 is connected to the hydrostatic bearing 40, so that the platform 50 rotates with the drive assembly 30.

[0030] The hydrostatic bearing 40 includes a guide ring 41, a ball seat 42, and a shaft ball 43. The guide ring 41 is fixedly connected to the housing 20 and has a liquid inlet for inputting hydraulic oil. The ball seat 42 is connected to the guide ring 41 and contacts the inner wall of the guide ring 41. An annular guide channel 421 is formed on the outer wall of the bottom of the ball seat 42, and the liquid inlet is connected to the guide channel 421. The top surface of the ball seat 42 contacts the platform 50, and the bottom surface of the ball seat 42 contacts the drive assembly 30. The ball seat 42 has a hollow bowl-shaped mounting cavity in the middle, and a liquid flow channel 422 is formed inside the ball seat 42, which communicates with the guide channel 421. A plurality of first oil chambers 424 are formed around the top surface of the ball seat 42, and the first oil chambers 424 are connected to the platform. A first oil film is formed on the surface 50. A plurality of second oil chambers 425 are arranged around the bottom surface of the ball seat 42. The second oil chambers 425 and the drive assembly 30 form a second oil film. A plurality of third oil chambers 426 are arranged around the inner wall of the mounting cavity. Each first oil chamber 424, each second oil chamber 425 and each third oil chamber 426 are connected to the liquid flow channel 422. Each first oil chamber 424, each second oil chamber 425 and each third oil chamber 426 are provided with a throttle 428. The shaft ball 43 is installed in the mounting cavity, and the top of the shaft ball 43 is connected to the platform 50. The bottom of the shaft ball 43 is connected to the drive assembly 30. The outer wall of the shaft ball 43 forms a spherical surface. The spherical surface contacts and fits with the inner wall of the mounting cavity. A third oil film is formed between the spherical surface and the third oil chamber 426. In this embodiment, hydraulic oil is introduced through the inlet. The hydraulic oil enters each oil chamber through the guide channel 421 to form an oil film in the axial and radial directions. In other words, a stable and high-rigidity oil film is formed between the rotating structure and the bearing, which can support the rotating part to achieve high-precision rotation and improve the rotation accuracy and load-bearing capacity.

[0031] Among them, an annular guide groove is formed on the outer wall of the bottom of the ball seat 42. After the ball seat 42 is connected to the guide ring 41, the outer wall surface of the bottom of the ball seat 42 contacts the inner wall surface of the guide ring 41, thereby forming a guide channel 421 in the annular guide groove. Hydraulic oil is input into the guide ring 41 through the inlet and enters each oil chamber through the guide channel 421.

[0032] Understandably, the hydrostatic bearing 40 is used to support the weight of the table 50 and the load on the table 50, and also needs to transmit the torque of the drive assembly 30 to achieve the rotation of the table 50. In ultra-precision machine tools, the hydrostatic bearing 40 needs to have a high-precision rotating part to achieve high-precision rotation of the table 50. In this embodiment, the drive assembly 30 is a rotary drive component, and the drive assembly 30 is connected to the shaft ball 43 to drive the shaft ball 43 to rotate. The table 50 is connected to the shaft ball 43. From the perspective of the support part, the shaft ball 43, as the main rotation transmission component and support component, forms a third oil film, namely a radial oil film, between itself and the mounting cavity, thereby giving the rotation and support of the shaft ball 43 good stability and high load-bearing capacity. Moreover, the overall shape of the shaft ball 43 is a hemispherical structure, which can achieve a self-centering function during operation, thereby achieving high-precision rotation. From the perspective of torque transmission, the bearing ball 43 forms an oil film layer between itself and the mounting chamber 420 through multiple third oil films, thereby greatly reducing the friction between the bearing ball 43 and the inner wall of the mounting chamber 420, thus enabling efficient torque transmission and achieving high-precision rotation. Furthermore, from the perspective of manufacturing difficulty, compared to traditional "I"-shaped or double-cone hydrostatic turntables (which require high machining and assembly precision), the hemispherical bearing ball 43 used in this embodiment integrates the "radial bearing" and the "axial bearing" together. At the same time, the manufacturing precision requirements of the hemispherical bearing ball 43 are lower than those of traditional types, and the precision can be improved through subsequent grinding, reducing the manufacturing difficulty of the bearing and the assembly difficulty of the turntable.

[0033] Furthermore, a first oil film, i.e., an axial oil film, exists between the table 50 and the ball seat 42. This first oil film enables high-precision rotation of the table 50 and provides it with high rigidity, thereby enhancing its load-bearing capacity and connection rigidity. Similarly, a second oil film, i.e., an axial oil film, is provided between the ball seat 42 and the drive assembly 30. This second oil film enables high-precision rotation and high load-bearing capacity of the rotating components in the drive assembly 30. In addition, in this example, each oil chamber has a built-in liquid throttle 428, which is threaded into the oil passage hole of each oil chamber, facilitating installation and disassembly.

[0034] In practical applications, sealing rings are provided at both the upper and lower ends of the guide channel 421 to prevent leakage of the input hydraulic oil. Each oil chamber (i.e., the first oil chamber 424, the second oil chamber 425, and the third oil chamber 426) has a corresponding ball seat 42 with a liquid flow channel 422 inside. The liquid flow channel 422 has a radial connecting section that communicates with the guide channel 421. From the radial connecting section, it branches into three branches, which correspond to the first oil chamber 424, the second oil chamber 425, and the third oil chamber 426 respectively, to allow hydraulic oil to be input into each oil chamber.

[0035] In specific settings, such as Figure 1 , Figure 4 As shown, the ball seat 42 has an annular first liquid accumulation groove 427 around its edge near the first oil chamber 424. An oil return through hole 423 is axially formed at the bottom of the first liquid accumulation groove 427, communicating with the first liquid accumulation groove 427. A second liquid accumulation groove 22 is provided in the upper part of the housing 20, communicating with the first liquid accumulation groove 427 through the oil return through hole 423. An oil return outlet is provided on the outer wall of the housing 20. Correspondingly, a first oil return groove 4241 is provided between adjacent first oil chambers 424, and adjacent second oil chambers 424... A second oil return groove 4251 is provided between the cavities 425; wherein, the first oil return groove 4241 enables the liquid overflowing from the first oil cavity 424 to enter the first liquid accumulation groove 427 through the first oil return groove 4241, and finally enter the second liquid accumulation groove 22 through the oil return through hole 423. One end of the second oil return groove 4251 is located above the second liquid accumulation groove 22 and is connected to the second liquid accumulation groove 22. That is, the overflowing liquid in the second oil return groove 4251 directly enters the second liquid accumulation groove 22 and is output through the oil return outlet to realize the circulation of liquid.

[0036] It is understood that the oil return through hole 423 includes a first section that vertically penetrates the ball seat 42 and a second section that penetrates the guide ring 41. When connected, the first section and the second section of the oil return through hole 423 are on the same axis, thereby realizing the connection of the oil return through hole 423, so that the liquid can enter the second liquid accumulation tank 22 through the oil return through hole 423.

[0037] In a specific embodiment, a plurality of oil return holes 423 are provided at the bottom of the first liquid collection tank 427. The plurality of oil return holes 423 are evenly arranged at the bottom of the first liquid collection tank 427 so that the hydraulic oil in the first liquid collection tank 427 is collected into the second liquid collection tank 22 through the plurality of oil return holes 423 and recycled through the second liquid collection tank 22.

[0038] In specific applications, multiple first oil chambers 424 are evenly arranged around the top surface of the ball seat 42, forming a first oil film layer between the platform 50 and the multiple first oil chambers 424. This results in minimal friction between the platform 50 and the ball seat 42, and provides higher load-bearing capacity through the oil film. Similarly, multiple second oil chambers 425 are evenly arranged around the bottom surface of the ball seat 42, forming a second oil film layer on the bottom surface of the ball seat 42. Similarly, multiple third oil chambers 426 are evenly arranged around the inner wall of the mounting chamber 420, forming a third oil film layer between the shaft ball 43 and the inner wall of the mounting chamber 420. This results in extremely low friction and high load-bearing capacity between the hydrostatic bearing 40 and the rotating structural component, which includes the rotating part of the drive assembly 30, the shaft ball 43, and the platform 50.

[0039] In a specific embodiment, six first oil chambers 424 are evenly spaced around the top surface of the ball seat 42. A first return oil groove 4241 is provided between adjacent first oil chambers 424. The return liquid in the first return oil groove 4241 flows into a first accumulation tank 427 and then enters a second accumulation tank 22 through a return oil through hole 423, achieving liquid output and reuse. Six second oil chambers 425 are evenly spaced around the bottom surface of the ball seat 42. A second return oil groove 4251 is provided between adjacent second oil chambers 425. The liquid in the second return oil chambers flows directly into the second accumulation tank 22 for reuse.

[0040] According to one embodiment of the present invention, the hydrostatic turntable further includes a cooling assembly 60, which is disposed within the mounting space 21 and located between the drive assembly 30 and the housing 20. The drive assembly 30 generates significant heat during rotation. In this embodiment, by placing the cooling assembly 60 within the mounting space 21, timely heat dissipation of the drive assembly 30 is achieved, ensuring stable operation of the drive assembly 30 and improving the stability of the hydrostatic turntable.

[0041] Understandably, the relatively enclosed installation space 21 within the housing 20 prevents the heat generated by the drive assembly 30 during operation from being dissipated in a timely manner. In this embodiment, the timely cooling of the drive assembly 30 via the cooling assembly 60 improves operational stability.

[0042] For example, the cooling component 60 can be a liquid cooling device, which is located within the installation space 21 to dissipate heat in a timely manner. For instance, it can be a tubular heat exchanger. Of course, other cooling structures are also possible, such as air cooling devices or other cooling fin structures.

[0043] In this embodiment, the cooling assembly 60 includes a cooling sleeve 61, which is fixedly mounted on the base 10 and located outside the drive assembly 30. The outer wall of the cooling sleeve 61 is provided with a cooling channel 62 for coolant flow. The housing 20 is provided with a coolant inlet, which communicates with the cooling channel 62 and is used to input coolant. In this embodiment, the cooling assembly 60 places the cooling platform outside the drive assembly 30, enabling timely heat transfer from the drive assembly 30, and then timely heat removal from the drive assembly 30 through the coolant flowing within the cooling channel 62.

[0044] Understandably, the cooling jacket 61, located outside the drive assembly 30, enables efficient heat transfer, thereby achieving efficient heat dissipation, improving heat dissipation efficiency, and ensuring stable operation of the hydrostatic turntable.

[0045] In a specific embodiment, there are multiple cooling channels 62, which are spaced apart axially, and sealing rings are provided above and below the cooling channels 62 at both ends. Coolant needs to circulate through the cooling channels 62; by providing sealing rings at both ends of the cooling channels 62, the cooling channels 62 can be sealed to prevent coolant leakage.

[0046] Understandably, the multiple spaced cooling channels 62 can increase the contact area between the coolant and the cooling jacket 61, thereby further improving cooling efficiency and enhancing the cooling effect.

[0047] According to one embodiment of the present invention, the drive assembly 30 includes a stator component 31, a rotor component 32, and a connecting sleeve 33. The stator component 31 is fixedly sleeved on the inner wall of the cooling sleeve 61. The rotor component 32 is located inside the stator component 31 and connected to the connecting sleeve 33. The connecting sleeve 33 is located on the base 10 and connected to the bearing ball 43. The top surface of the connecting sleeve 33 and the bottom surface of the bearing ball 42 form the second oil film. The rotor component 32, the stator component 31, and the connecting sleeve 33 form the motor part. That is, after power is applied, the rotor component 32 can rotate, thereby driving the connecting sleeve 33 to rotate. The connecting sleeve 33 is connected to the bearing ball 43, and the rotation of the connecting sleeve 33 drives the bearing ball 43 to rotate.

[0048] Understandably, the stator component 31 is connected to the cooling jacket 61, and the cooling jacket 61 is connected to the base 10, thereby enabling the load-bearing capacity of the customized component. The outer wall of the cooling jacket 61 has multiple cooling channels 62, through which coolant is circulated to cool the cooling jacket 61. It can be seen that the connection between the cooling jacket 61 and the stator component 31 enables rapid heat transfer, thus achieving rapid cooling of the drive assembly 30, ensuring a relatively stable operating environment for the drive assembly 30, and improving the stability of the hydrostatic turntable.

[0049] In a specific example, the connecting sleeve 33 is located on the base 10. The connecting sleeve 33 is connected to the shaft ball 43 by bolts. The top surface area of ​​the connecting sleeve 33 is in contact with the bottom surface of the ball seat 42. The bottom surface of the ball seat 42 has a second oil cavity 425. The second oil cavity 425 can form a second oil film layer with the top surface of the connecting sleeve 33.

[0050] In a specific configuration, the drive assembly 30 also includes a connecting shaft 35 and an encoder 34. The connecting shaft 35 is connected to a connecting sleeve 33, and the encoder 34 is mounted on the connecting shaft 35. In ultra-precision machine tools, it is necessary to accurately measure the position or angle of rotation. In this embodiment, the connecting shaft 35 is connected to the connecting sleeve 33, and the connecting sleeve 33 can drive the connecting shaft 35 and the encoder 34 to rotate.

[0051] In specific applications, the middle part of the base 10 has an upward protruding portion 11, so as to form an assembly space for connecting the connecting shaft 35 and the encoder 34. The base 10 is generally configured in a substantially "几"-shaped structure, with the middle part being an upward protruding structure, and this part of the space can accommodate the installation of the encoder 34 and the connecting shaft 35, thereby making the overall structure more compact.

[0052] In a specific example, the peripheral part of the base 10 is provided with a first-level step, wherein the part close to the middle of the base 10 is used for installing the stator component 31 and the rotor component 32, and the part close to the edge of the base 10 is used for installing the cooling jacket 61 and the housing 20. For example, the cooling jacket 61 is bolted to the step of the base 10 at the edge position, and the housing 20 is closely attached to the outer wall of the cooling jacket 61, so that the cooling channel 62 on the outer wall of the cooling jacket 62 is in close contact and sealed with the inner wall surface of the housing 20, ensuring that the cooling liquid can circulate around the cooling channel 62.

[0053] In specific configuration, a cooling liquid outlet is further provided on the side wall of the housing 20 at a position close to the cooling channel 62, and the cooling liquid outlet is used to discharge the cooling liquid in the cooling channel 62, so as to realize rapid circulation of the cooling liquid and improve heat dissipation efficiency.

[0054] In specific applications, a circle of protruding limiting edge is provided on the top edge of the inner wall of the cooling jacket 61, and a limiting step corresponding to the limiting edge is provided on the outer wall of the corresponding stator component 31. During connection, the cooling jacket 61 is fixedly connected to the base 10, which can realize the limiting of the limiting step and fix the stator component 31.

[0055] According to an embodiment provided by the present invention, an adjustment shim 70 is provided between the shaft ball 43 and the connecting sleeve 33, and the adjustment shim 70 is located at the bottom of the installation cavity. The adjustment shim 70 is of an overall circular ring structure, and the connection between the connecting sleeve 33 and the shaft ball 43 is realized through the adjustment shim 70.

[0056] It can be understood that during connection, one side of the adjustment shim 70 is connected to the bottom of the shaft ball 43, and the other side of the adjustment shim 70 is connected to the end face of the connecting sleeve 33 in the drive assembly 30. The connecting sleeve 33 is driven to rotate by the rotor component 32, so as to drive the shaft ball 43 to rotate.

[0057] In specific configuration, as Figure 1 shown, the bottom parts of the connecting sleeve 33, the adjustment shim 70 and the shaft ball 43 are all provided with bolt holes, and bolts pass through the connecting sleeve 33 and the adjustment shim 70 to extend into the bolt holes at the bottom of the shaft ball 43 to realize the overall connection. The adjustment shim 70 is in clearance fit with the bottom of the installation chamber 420.

[0058] According to a specific embodiment of the present invention, the stator component 31, rotor component 32, connecting sleeve 33, and shaft ball 43 are coaxially arranged. The stator component 31 and rotor component 32 form a motor structure, and the connecting sleeve 33 is connected to the rotor component 32 to form the output end of the motor structure. By arranging them coaxially, torque transmission is facilitated, and efficient torque transmission can be achieved.

[0059] In specific configuration, the hydrostatic turntable is a cylindrical structure. The housing 20 is fixed to the base 10 by bolts, and the guide ring 41 is located above the housing 20 and is coaxially fixed to the housing 20 by bolts. The cooling jacket 61 is located outside the stator component 31 and is coaxially arranged with the stator component 31, which facilitates the assembly of the stator component 31.

[0060] According to some embodiments of the present invention, a retaining ring structure 80 is provided around the top edge of the ball seat 42. The retaining ring structure 80 can achieve a seal at the base, making the hydrostatic bearing 40 part relatively sealed and improving its service life.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A small-orifice liquid throttling hydrostatic rotary table, characterized in that, include: Base; A housing, which is fixedly mounted on the base, has an installation space; A drive component, wherein the drive component is disposed within the installation space; A hydrostatic bearing is connected to the drive assembly so that the hydrostatic bearing rotates with the drive assembly; A platform, the platform being connected to the hydrostatic bearing, so as to drive the platform to rotate via the hydrostatic bearing; wherein, the hydrostatic bearing comprises: A flow guide ring is fixedly connected to the housing, and the flow guide ring is provided with a liquid inlet for inputting hydraulic oil; A ball seat is connected to the flow guide ring and contacts the inner wall of the flow guide ring. An annular flow guide channel is formed on the outer wall of the bottom of the ball seat, and the liquid inlet is connected to the flow guide channel. The top surface of the ball seat contacts the platform, and the bottom surface of the ball seat contacts the drive assembly. A hollow bowl-shaped mounting cavity is provided in the middle of the ball seat, and a liquid flow channel is formed inside the ball seat, communicating with the flow guide channel. Multiple first oil chambers are arranged around the top surface of the ball seat, forming a first oil film with the platform. Multiple second oil chambers are arranged around the bottom surface of the ball seat, forming a second oil film with the drive assembly. Multiple third oil chambers are arranged around the inner wall of the mounting cavity. Each first, second, and third oil chamber communicates with the liquid flow channel, and each first, second, and third oil chamber is equipped with a throttle. A spherical bearing is installed in the mounting cavity. The top of the spherical bearing is connected to the platform, and the bottom of the spherical bearing is connected to the drive assembly. The outer wall of the spherical bearing has a spherical surface that contacts and engages with the inner wall of the mounting cavity. A third oil film is formed between the spherical surface and the third oil cavity.

2. The orifice liquid throttling hydrostatic rotary table according to claim 1, characterized in that, It also includes a cooling assembly disposed within the mounting space and located between the drive assembly and the housing.

3. The orifice liquid throttling hydrostatic rotary table according to claim 2, characterized in that, The cooling assembly includes a cooling jacket, which is fixedly mounted on the base and located outside the drive assembly. The outer wall of the cooling jacket is provided with a cooling channel for coolant flow. The housing is provided with a coolant inlet, which communicates with the cooling channel and is used to input coolant.

4. The orifice liquid throttling hydrostatic rotary table according to claim 3, characterized in that, The cooling channel has multiple channels, which are spaced apart axially, and sealing rings are provided above and below the cooling channels at both ends.

5. The orifice liquid throttling hydrostatic rotary table according to claim 3, characterized in that, The drive assembly includes a stator component, a rotor component, and a connecting sleeve. The stator component is fixedly sleeved on the inner wall of the cooling sleeve. The rotor component is located inside the stator component and connected to the connecting sleeve. The connecting sleeve is located on the base and connected to the shaft ball. The top surface of the connecting sleeve and the bottom surface of the ball seat form the second oil film.

6. The orifice liquid throttling hydrostatic rotary table according to claim 5, characterized in that, The drive assembly further includes a connecting shaft and an encoder, the connecting shaft being connected to the connecting sleeve, and the encoder being mounted on the connecting shaft.

7. The orifice liquid throttling hydrostatic rotary table according to claim 6, characterized in that, The base has an upwardly protruding portion in the middle to form an assembly space for connecting the connecting shaft and the encoder.

8. The orifice liquid throttling hydrostatic rotary table according to claim 5, characterized in that, An adjusting shim is provided between the ball bearing and the connecting sleeve, and the adjusting shim is located at the bottom of the mounting cavity.

9. The orifice liquid throttling hydrostatic rotary table according to claim 1, characterized in that, Multiple first oil chambers are evenly spaced around a ring on the top surface of the ball seat. There is a first oil return groove between adjacent first oil chambers. A ring-shaped first liquid accumulation groove is provided around the top surface of the ball seat near the oil chamber. An oil return through hole is opened at the bottom of the first liquid accumulation groove. The first oil return groove is connected to the first liquid accumulation groove so that the liquid in the first oil return groove can enter the first liquid accumulation groove. Multiple second oil chambers are evenly spaced around a ring on the bottom surface of the ball seat, and a second oil return groove is provided between adjacent second oil chambers. A second liquid accumulation tank is provided in the upper part of the housing, and the second oil return tank is connected to the second liquid accumulation tank. The first liquid accumulation tank is connected through the oil return through hole, and an oil return outlet is provided on the outer wall surface of the housing.

10. The orifice liquid throttling hydrostatic rotary table according to claim 9, characterized in that, The ball seat has a retaining ring structure around the top edge.

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