Hydrostatic bearing system and hydrostatic rotary table

Abstract

The utility model discloses a static pressure bearing system and a static pressure rotary table, the static pressure rotary table comprises the static pressure bearing system, and the static pressure bearing system comprises a bearing, a throttler, a liquid resistor, an oil supply assembly, a detection assembly and a control assembly. The bearing comprises a shaft body and a shaft core, the throttler is used for adjusting the rigidity of an oil film in the static pressure cavity, the liquid resistor is used for applying fixed liquid resistance to the oil film in the static pressure cavity, and the fixed liquid resistance applied to the oil film by the liquid resistor is smaller than the minimum liquid resistance applied to the oil film by the throttler. When the rotating speed of the shaft core is smaller than a first preset value or the bearing of the shaft core is smaller than a second preset value, the control assembly is used for controlling the oil supply assembly to be communicated with the liquid resistor and controlling the oil supply assembly to be disconnected from the throttler; when the rotating speed of the shaft core is larger than or equal to a first preset value or the bearing capacity of the shaft core is larger than or equal to a second preset value, the control assembly is used for controlling the oil supply assembly to be disconnected from the liquid resistor and controlling the oil supply assembly to be communicated with the throttler. The hydrostatic bearing solves the problem that in the prior art, the bearing range of a hydrostatic bearing is small.

Description

Technical Field

[0001] This application relates to the field of ultra-precision machine tool technology, and more specifically, to a hydrostatic bearing system and a hydrostatic rotary table. Background Technology

[0002] In ultra-precision machine tools, hydrostatic rotary tables are typically equipped with hydrostatic bearings instead of traditional tapered roller bearings to drive their rotation. Hydrostatic bearings have a hydrostatic cavity between the shaft and the housing, and the oil film in this cavity prevents mechanical contact between the shaft and the housing, thus reducing friction and improving the rotational accuracy of the hydrostatic rotary table. Compared to traditional tapered roller bearings, hydrostatic bearings offer advantages such as higher transmission efficiency and lower structural precision requirements.

[0003] However, due to the limited load capacity of existing hydrostatic bearings, when the hydrostatic bearing is operating at low speeds or under low load, the oil film in the hydrostatic chamber may experience excessive or insufficient local stress, causing the hydrostatic bearing to jam or vibrate. Conversely, when the speed of the hydrostatic bearing is too high or the load is too large, the oil film in the hydrostatic chamber may rupture, causing the hydrostatic bearing to malfunction. Utility Model Content

[0004] The main objective of this application is to provide a hydrostatic bearing system to at least solve the problem of the small load-bearing range of hydrostatic bearings in the prior art.

[0005] According to one aspect of this application, a hydrostatic bearing system is provided, comprising:

[0006] A bearing, comprising a shaft body and a shaft core, wherein the shaft core is disposed through the shaft body, and a static pressure cavity is provided between the shaft body and the shaft core;

[0007] A throttle valve, which is connected to the static pressure chamber, is used to adjust the stiffness of the oil film in the static pressure chamber;

[0008] A liquid resistor is disposed on the shaft and communicates with the hydrostatic chamber. The liquid resistor is used to apply a fixed liquid resistance to the oil film in the hydrostatic chamber, and the fixed liquid resistance applied by the liquid resistor to the oil film is less than the minimum liquid resistance applied by the throttle to the oil film.

[0009] An oil supply assembly, which is connected to both the throttle and the liquid resistor;

[0010] A detection component is disposed on the bearing, and the detection component is used at least to detect the rotational speed of the shaft and the load capacity of the shaft;

[0011] A control component, which is connected to the oil supply component and electrically connected to the detection component;

[0012] Specifically, when the rotational speed of the shaft is less than a first predetermined value or the load on the shaft is less than a second predetermined value, the control component controls the oil supply component to connect with the liquid resistor and controls the oil supply component to disconnect from the throttle; when the rotational speed of the shaft is greater than or equal to the first predetermined value or the load on the shaft is greater than or equal to the second predetermined value, the control component controls the oil supply component to disconnect from the liquid resistor and controls the oil supply component to connect with the throttle.

[0013] Furthermore, the liquid resistor is provided with a hydraulic chamber, and the liquid resistor is also provided with a first oil inlet and a first oil outlet. The two ends of the first oil inlet are respectively connected to the hydraulic chamber and the oil supply assembly, and the two ends of the first oil outlet are respectively connected to the hydraulic chamber and the static pressure chamber.

[0014] Furthermore, the liquid resistor includes:

[0015] The body is fixed to the outer peripheral surface of the shaft. The body has a first surface opposite to the outer peripheral surface of the shaft and a second surface opposite to the first surface. The first oil inlet and the first oil outlet both extend from the first surface to the second surface. A liquid resistance groove is formed on the second surface of the body.

[0016] A baffle is disposed on the second surface of the body, and the baffle and the throttle form the hydraulic cavity.

[0017] Furthermore, along the direction of the liquid resistor near the shaft, the maximum depth A of the liquid resistance groove satisfies the relationship: 0.05mm≤A≤0.2mm.

[0018] Furthermore, the throttle is connected to the liquid resistor, and the throttle includes a second oil inlet and a second oil outlet;

[0019] The liquid resistor is provided with a first clearance hole and a second clearance hole. The two ends of the first clearance hole are respectively connected to the second oil inlet and the oil supply component, and the two ends of the second clearance hole are respectively connected to the second oil outlet and the static pressure chamber.

[0020] Furthermore, the liquid resistor has a first sealing cavity on the side near the throttle, the first clearance hole penetrates the first sealing cavity, and a first sealing element is embedded in the first sealing cavity; and / or,

[0021] The liquid resistor has a second sealing cavity on the side near the throttle, the second clearance hole penetrates the second sealing cavity, and a second sealing element is embedded in the second sealing cavity.

[0022] Furthermore, the control component includes:

[0023] A solenoid valve is disposed between the bearing and the oil supply assembly. The solenoid valve has a first position in which the oil supply assembly is connected to the liquid resistor and disconnected from the throttle, and a second position in which the oil supply assembly is disconnected from the liquid resistor and connected to the throttle.

[0024] The controller is electrically connected to the detection component and the solenoid valve respectively. The controller is used to compare the rotational speed of the shaft core with the first predetermined value and the load of the bearing with the second predetermined value, so as to control the solenoid valve to switch between the first position and the second position.

[0025] Furthermore, the detection component includes:

[0026] A speed sensor is mounted on the shaft core and is electrically connected to the control component.

[0027] A pressure sensor is mounted on the shaft core and is electrically connected to the control component.

[0028] Furthermore, the oil supply assembly includes:

[0029] Hydraulic power unit;

[0030] The first oil supply pipeline has its two ends connected to the liquid resistor and the hydraulic station, respectively.

[0031] The second oil supply pipeline has its two ends connected to the throttle and the hydraulic station, respectively, and the control component is installed on the first oil supply pipeline and the second oil supply pipeline.

[0032] On the other hand, this application also provides a hydrostatic rotary table, which includes the hydrostatic bearing system described above.

[0033] Compared to existing technologies, in this application, when the bearing is operating at low speeds or the pressure applied to the bearing by the turntable is relatively small, a liquid resistor is used to apply a fixed liquid resistance to the oil film in the static pressure chamber. This fixed liquid resistance stabilizes the thickness and rigidity of the oil film within the static pressure chamber within a certain range, thus preventing excessive or insufficient local pressure in the oil film, which could lead to vibration or jamming during bearing rotation. When the bearing is operating at high speeds or under heavy loads, a throttle is used to apply a variable liquid resistance to the oil film in the static pressure chamber. Since the minimum liquid resistance applied by the throttle is greater than the fixed liquid resistance applied by the liquid resistor, the throttle can apply a greater liquid resistance to the oil film, thereby increasing the rigidity of the oil film, increasing its load-bearing capacity, and preventing oil film rupture. The structure of this application, by setting up a control component, allows the bearing to be connected to the liquid resistor or throttle through the oil supply component under different operating conditions, thereby applying different amounts of preload force to the oil film in the static pressure chamber. This improves the overall performance of the hydrostatic bearing while increasing its load-bearing range. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a schematic diagram of the hydrostatic rotary table disclosed in this application;

[0036] Figure 2 This is a schematic diagram of the structure of the bearing disclosed in this application;

[0037] Figure 3 This is a schematic diagram of the assembly of the flow throttle and the liquid resistor disclosed in this application;

[0038] Figure 4 This is a schematic diagram of the liquid resistor disclosed in this application;

[0039] Figure 5 This is a schematic cross-sectional view of the liquid resistor disclosed in this application;

[0040] Figure 6 This is a schematic diagram of the structure of the throttle device disclosed in this application;

[0041] Figure 7 This is an exploded structural diagram of the throttle device disclosed in this application;

[0042] Figure 8 This is a schematic diagram of the main body of the throttle device disclosed in this application;

[0043] The above figures include the following reference numerals:

[0044] 10. Bearing; 11. Shaft body; 12. Shaft core; 20. Throttling device; 21. Main body; 22. Cover plate; 23. Diaphragm sheet; 30. Liquid resistor; 31. First oil inlet; 32. First oil outlet; 33. Liquid resistance groove; 34. First clearance hole; 35. Second clearance hole; 36. First sealing cavity; 37. Second sealing cavity; 38. Annular sealing groove; 40. Oil supply assembly; 41. Hydraulic station; 42. First oil supply pipe; 43. Second oil supply pipe; 50. Detection assembly; 51. Rotary... 52. Speed ​​sensor; 60. Pressure sensor; 61. Control component; 62. Controller; 63. Solenoid valve; 111. First oil passage; 112. Second oil passage; 211. First side; 212. Second side; 213. Second oil inlet; 214. First throttling channel; 215. Second throttling channel; 301. Body; 302. Baffle; 311. First surface; 312. Second surface; 2111. Groove; 2112. Throttling boss; 2113. Second oil outlet. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0048] See Figures 1 to 8As shown, according to an embodiment of this application, a hydrostatic rotary table is provided, which includes a hydrostatic bearing system, comprising a bearing 10, a throttle 20, a liquid resistor 30, an oil supply assembly 40, a detection assembly 50, and a control assembly 60.

[0049] The bearing 10 includes a shaft body 11 and a shaft core 12. The shaft core 12 extends through the shaft body 11, and a static pressure chamber is provided between the shaft body 11 and the shaft core 12. A throttle 20 is connected to the static pressure chamber and is used to adjust the stiffness of the oil film within the static pressure chamber. A liquid resistor 30 is mounted on the shaft body 11 and is also connected to the static pressure chamber. The liquid resistor 30 applies a fixed liquid resistance to the oil film within the static pressure chamber, and the fixed liquid resistance applied by the liquid resistor 30 to the oil film is less than the minimum liquid resistance applied by the throttle 20 to the oil film. An oil supply assembly 40 is connected to both the throttle 20 and the liquid resistor 30. A detection assembly 50 is mounted on the bearing 10 and is used at least to detect the rotational speed of the shaft core 12 and the load capacity of the shaft core 12. A control assembly 60 is connected to the oil supply assembly 40 and is electrically connected to the detection assembly 50. Specifically, when the rotational speed of the shaft core 12 is less than a first predetermined value or the load on the shaft core 12 is less than a second predetermined value, the control component 60 controls the oil supply component 40 to connect with the liquid resistor 30 and controls the oil supply component 40 to disconnect from the throttle 20; when the rotational speed of the shaft core 12 is greater than or equal to the first predetermined value or the load on the shaft core 12 is greater than or equal to the second predetermined value, the control component 60 controls the oil supply component 40 to disconnect from the liquid resistor 30 and controls the oil supply component 40 to connect with the throttle 20.

[0050] Specifically, when the bearing 10 is at a low speed or the pressure applied to the bearing 10 by the turntable is small, a liquid resistor 30 is used to apply a fixed liquid resistance to the oil film in the static pressure chamber. The fixed liquid resistance keeps the thickness and rigidity of the oil film in the static pressure chamber stable within a certain range, thus avoiding excessive or insufficient local pressure in the oil film in the static pressure chamber, which could cause the bearing 10 to vibrate or jam during rotation. When the bearing 10 is at a high speed or the bearing 10 bears a large load, a throttle 20 is used to apply a variable liquid resistance to the oil film in the static pressure chamber. Since the minimum liquid resistance applied to the oil film by the throttle 20 is greater than the fixed liquid resistance applied to the oil film by the liquid resistor 30, the throttle 20 can apply a greater liquid resistance to the oil film, thereby increasing the rigidity of the oil film, increasing the load-bearing capacity, and thus preventing the oil film from rupturing. The structure of this embodiment, by setting up a control component 60, allows the bearing 10 to be connected to the liquid resistor 30 or the throttle 20 through the oil supply component 40 under different working conditions, thereby applying different amounts of preload force to the oil film in the hydrostatic chamber, which improves the overall performance of the hydrostatic bearing and increases the bearing capacity of the hydrostatic bearing.

[0051] In some specific embodiments, the first predetermined value is set to 10 revolutions per minute. When the rotational speed of the shaft core 12 is lower than 10 revolutions per minute, the oil supply assembly 40 is connected to the static pressure chamber through the hydraulic resistor 30. At this time, since the rotational speed of the shaft core 12 is low, a thicker oil film is set between the shaft core 12 and the shaft body 11 to reduce the friction of the shaft core 12 and make the rotation of the shaft core 12 more stable. When the rotational speed of the shaft core 12 is higher than or equal to 10 revolutions per minute, since the rotational speed of the shaft core 12 increases, in order to enable the oil film to withstand the pressure applied by the shaft core 12, a throttle 20 is used to increase the hydraulic pressure of the oil film, thereby increasing the rigidity of the oil film and preventing the oil film from rupturing. The second preset value is usually set to 1 MPa. When the load of the shaft core 12 is less than 1 MPa, it means that the mass of the workpiece on the hydrostatic turntable is small. At this time, the rigidity of the oil film does not need to be too large, and the oil film is sufficient to support the shaft core 12. Conversely, when the load of the shaft core 12 is higher than or equal to 1 MPa, the load of the shaft core 12 is large. In order to avoid the oil film from breaking, the throttle 20 is used to increase the rigidity of the oil film.

[0052] In this embodiment, the throttle 20 is connected to the liquid resistor 30, see Appendix Figure 6 To be continued Figure 8 In this embodiment, the throttle device 20 includes a main body 21, a cover plate 22, and a diaphragm sheet 23. The main body 21 has a first side surface 211 and a second side surface 212. The first side surface 211 of the main body 21 has a groove 2111, and a throttling boss 2112 is provided in the center of the groove 2111. A second oil outlet 2113 is provided on the throttling boss 2112, which extends from the first side surface 211 to the second side surface 212. The second side surface 212 of the main body 21 forms an oil supply channel with the outer peripheral surface of the liquid resistor 30. The main body 21 also has a second oil inlet 213, a first throttling channel 214, and a second throttling channel 215. The second oil inlet 213 is connected to both the oil supply channel and the second throttling channel 215. The cover plate 22 is placed on the first side surface 211 of the main body 21. A diaphragm 23 is disposed between the cover plate 22 and the main body 21, and the space between the diaphragm 23 and the groove 2111 located outside the throttling boss 2112 forms a pressure stabilizing cavity, while the space between the diaphragm 23 and the cover plate 22 forms an adjusting cavity. The two ends of the first throttling channel 214 are respectively connected to the oil supply channel and the pressure stabilizing cavity, the two ends of the second throttling channel 215 are respectively connected to the adjusting cavity and the oil supply channel, and the second oil outlet 2113 is connected to both the static pressure cavity and the oil supply channel.

[0053] In this embodiment, when the bearing 10 is in operation, after the oil supply assembly 40 is connected to the throttle valve 20, the oil flows into the static pressure chamber through the throttle valve 20, causing an oil film to be generated between the shaft body 11 and the shaft core 12. Simultaneously, the throttle valve 20 in this embodiment can automatically adjust the stiffness of the oil film according to the force applied to it. Specifically, the oil supply assembly 40 is connected to the second oil inlet 213, and a portion of the oil flows from the second oil inlet 213 into the regulating chamber through the second throttling channel 215. Another portion of the oil flows into the oil supply channel, and then into the pressure stabilizing chamber through the first throttling channel 214, and into the static pressure chamber through the second oil outlet 2113. When the shaft core 12 rotates, the shaft core 12 or shaft body 11 applies pressure to the oil film. The oil in the static pressure chamber applies a reaction force to the oil in the oil supply channel, causing the oil entering the pressure stabilizing chamber to exert a thrust on the diaphragm 23. After being subjected to hydraulic pressure, the diaphragm 23 bends towards the regulating chamber. Depending on the magnitude of the hydraulic pressure, the degree of bending of the diaphragm 23 varies, thereby changing the relative volume between the static pressure chamber and the regulating chamber. This results in different flow rates of oil exiting the second oil outlet 2113 in the pressure stabilizing chamber, ensuring that the thickness of the oil film in the static pressure chamber remains almost unchanged, thus improving the rigidity of the oil film. It is worth mentioning that the hydraulic pressure applied to the oil film in the static pressure chamber by the throttle 20 is related to the material of the diaphragm 23. In actual production, it is difficult to find a material that allows the throttle 20 to provide a large hydraulic range. Therefore, in this embodiment, a fixed hydraulic resistance is used under low pressure and low speed conditions of the bearing 10, while the throttle 20 is used under high pressure and high speed conditions to adjust the rigidity of the oil film, thereby improving the load-bearing capacity of the bearing 10.

[0054] In this embodiment, the liquid resistor 30 is provided with a hydraulic chamber, and the liquid resistor is also provided with a first oil inlet 31 and a first oil outlet 32. The two ends of the first oil inlet 31 are respectively connected to the hydraulic chamber and the oil supply component 40, and the two ends of the first oil outlet 32 ​​are respectively connected to the hydraulic chamber and the static pressure chamber.

[0055] In other words, when the oil supply assembly 40 is connected to the hydraulic resistor 30, the oil enters the hydraulic chamber through the first oil inlet 31. The hydraulic chamber applies a certain pressure to the oil, and then the oil enters the static pressure chamber through the first oil outlet 32, so that the oil film in the static pressure chamber has a certain rigidity.

[0056] As attached Figure 2 and attached Figure 4As shown, the liquid resistor 30 includes a body 301 and a baffle 302. The body 301 is fixed to the outer peripheral surface of the shaft 11. The body 301 has a first surface 311 opposite to the outer peripheral surface of the shaft 11 and a second surface 312 opposite to the first surface 311. The first oil inlet 31 and the first oil outlet 32 ​​both extend from the first surface 311 to the second surface 312. The second surface 312 of the body 301 is provided with a liquid resistance groove 33. The baffle 302 is disposed on the second surface 312 of the body 301. The baffle 302 and the throttle 20 surround each other to form a hydraulic cavity.

[0057] Specifically, in this embodiment, the baffle 302 and the liquid resistance groove 33 on the body 301 form a hydraulic cavity. When the oil enters the liquid resistance groove 33 through the first oil inlet 31, the oil is subjected to the action of the baffle 302 and the inner wall of the liquid resistance groove 33, thereby increasing the hydraulic pressure of the oil. As a result, when the oil flows into the static pressure cavity through the first oil outlet 32, the oil has a certain rigidity.

[0058] Furthermore, along the direction of the liquid resistor 30 near the shaft 11, the maximum depth A of the liquid resistance groove 33 satisfies the relationship: 0.05mm≤A≤0.2mm.

[0059] It is understandable that the magnitude of the fixed liquid resistance applied by the liquid resistor 30 to the oil film is related to the maximum depth A of the liquid resistance groove 33. That is, when the flow rate is fixed, the larger the maximum depth A, the smaller the fixed liquid resistance applied by the liquid resistor 30 to the oil film; conversely, the smaller the maximum depth A, the larger the fixed liquid resistance applied by the liquid resistor 30 to the oil film. In this embodiment, the maximum depth A of the liquid resistance groove 33 satisfies the relationship: 0.005mm≤A≤0.2mm. When A satisfies the above relationship, the fixed liquid resistance applied by the liquid resistor 30 to the oil film will not be too large, that is, the rigidity of the oil film will not be too large, thereby reducing the friction between the shaft core 12 and the oil film; at the same time, the fixed liquid resistance applied by the liquid resistor 30 to the oil film will not be too low, that is, the oil film has a certain rigidity, so that the force on the oil film is relatively uniform, thereby avoiding the bearing 10 from jamming or shaking. In this embodiment, the value of A can be 0.005mm, 0.01mm, 0.015mm and 0.2mm.

[0060] In addition, a first clearance hole 34 and a second clearance hole 35 are provided through the liquid resistor 30. The two ends of the first clearance hole 34 are connected to the second oil inlet 213 and the oil supply assembly 40, respectively. The two ends of the second clearance hole 35 are connected to the second oil outlet 2113 and the static pressure chamber, respectively. Since the throttle 20 is provided on the liquid resistor 30 in this embodiment, the first clearance hole 34 and the second clearance hole 35 are required to facilitate communication between the throttle 20 and the static pressure chamber or between the throttle 20 and the oil supply assembly 40.

[0061] In some embodiments, a hydrostatic chamber is disposed on the opposite outer surfaces of the shaft body 11 and the shaft core 12. A first oil passage 111 and a second oil passage 112 are provided on the shaft body 11. The two ends of the first oil passage 111 are respectively connected to the first oil inlet 31 and the oil supply assembly 40, and the two ends of the second oil passage 112 are respectively connected to the first clearance hole 34 and the oil supply assembly 40. In addition, multiple hydrostatic chambers, multiple throttles 20 and multiple liquid resistors 30 are included. Multiple hydrostatic chambers, multiple liquid resistors 30 and multiple throttles 20 are arranged in a one-to-one correspondence. Multiple hydrostatic chambers are spaced apart along the circumferential direction of the shaft body 11, and multiple liquid resistors 30 are spaced apart along the circumferential direction of the shaft body 11, thereby making the oil film between the shaft body 11 and the shaft core 12 more uniformly stressed.

[0062] It is understandable that, since the rotation of the shaft core 12 is a variable process—that is, the shaft core 12 may be rotating at high speed for a certain period of time and at low speed for another period of time—both the throttle 20 and the liquid resistor 30 contain oil. Simultaneously, since the liquid resistor 30 has a first clearance hole 34, when oil enters the throttle 20 through the first clearance hole 34, the oil in the throttle 20 may flow into the liquid resistance groove 33 of the liquid resistor 30 through the gap between the first clearance hole 34 and the second oil inlet 213. This causes a change in the fixed liquid resistance applied by the liquid resistance groove 33 to the oil film, ultimately affecting the operating accuracy of the hydrostatic bearing at low speed and low pressure. Therefore, the liquid resistor 30 has a first sealing cavity 36 on the side near the throttle 20, and a first clearance hole 34 passes through the first sealing cavity 36. A first sealing element (not shown in the figure) is embedded in the first sealing cavity 36. Similarly, the liquid resistor 30 has a second sealing cavity 37 on the side near the throttle 20, and a second clearance hole 35 passes through the second sealing cavity 37. A second sealing element (not shown in the figure) is embedded in the second sealing cavity 37.

[0063] Specifically, the throttle 20 is fixed on the side of the baffle 302 away from the body 301, forming an oil supply channel between the throttle 20 and the baffle 302. The first clearance hole 34 and the second clearance hole 35 both penetrate the body 301 and the baffle 302. The body 301 has a first sealing groove and a second sealing groove on the side near the throttle 20. The baffle 302 and the first sealing groove form a first sealing cavity 36, and the baffle 302 and the second sealing groove form a second sealing cavity 37. The first sealing element in the first sealing cavity 36 and the second sealing element in the second sealing cavity 37 are used to prevent the oil in the throttle 20 from flowing into the liquid resistance groove 33 of the body 301 through the first clearance hole 34 and the second clearance hole 35, thereby preventing the liquid resistance device 30 from changing the fixed hydraulic pressure applied in the static pressure cavity, which would affect the rotational accuracy of the bearing 10 and cause a decrease in rotational accuracy.

[0064] In addition, the second surface 312 of the body 301 and the second side surface 212 of the throttle 20 are both provided with annular sealing grooves 38, and annular sealing rings (not shown in the figure) are embedded in the annular sealing grooves 38 to improve the sealing effect between the body 301 and the baffle 302, and between the throttle 20 and the baffle 302.

[0065] Furthermore, the control component 60 includes a solenoid valve 62 and a controller 61. The solenoid valve 62 is disposed between the bearing 10 and the oil supply component 40. The solenoid valve 62 has a first position that connects the oil supply component 40 to the liquid resistor 30 and disconnects the oil supply component 40 from the throttle 20, and a second position that disconnects the oil supply component 40 from the liquid resistor 30 and connects the oil supply component 40 to the throttle 20. The controller 61 is electrically connected to the detection component 50 and the solenoid valve 62 respectively. The controller 61 is used to compare the rotational speed of the shaft core 12 with a first predetermined value and compare the load of the bearing 10 with a second predetermined value to control the solenoid valve 62 to switch between the first position and the second position.

[0066] Specifically, after detecting the rotational speed and load of the shaft core 12, the detection component 50 transmits the rotational speed and load to the controller 61 via electrical signals. Upon receiving the rotational speed and load signals, the controller 61 compares the rotational speed of the shaft core 12 with a first predetermined value and the load with a second predetermined value. When the rotational speed is lower than the first predetermined value or the load is lower than the second predetermined value, the controller 61 controls the solenoid valve 62 to switch to the first position, at which point the oil supply component 40 is connected to the hydraulic resistor 30. When the rotational speed is higher than or equal to the second predetermined value, or the load is higher than or equal to the second predetermined value, the controller 61 controls the solenoid valve 62 to switch to the second position, so that the throttle 20 is connected to the oil supply component 40. In this embodiment, the solenoid valve 62 is a two-position three-way solenoid valve.

[0067] Furthermore, the detection component 50 includes a speed sensor 51 and a pressure sensor 52. The speed sensor 51 is mounted on the shaft core 12 and electrically connected to the control component 60. The pressure sensor 52 is also mounted on the shaft core 12 and electrically connected to the control component 60. Specifically, the speed sensor 51 detects the rotational speed of the shaft core 12 and transmits this speed to the controller 61 via an electrical signal; the pressure sensor 52 detects the load on the shaft core 12 and transmits this load to the controller 61 via an electrical signal.

[0068] As attached Figure 1As shown, the oil supply assembly 40 includes a hydraulic station 41, a first oil supply pipe 42, and a second oil supply pipe 43. The two ends of the first oil supply pipe 42 are connected to the hydraulic resistor 30 and the hydraulic station 41, respectively, and the two ends of the second oil supply pipe 43 are connected to the throttle 20 and the hydraulic station 41, respectively. The control assembly 60 is installed on the first oil supply pipe 42 and the second oil supply pipe 43.

[0069] In this embodiment, the hydraulic station 41 is used to increase the hydraulic fluid. The first oil supply pipe 42 is connected between the first oil passage 111 and the hydraulic station 41, and the second oil supply pipe 43 is connected between the second oil passage 112 and the hydraulic station 41. A two-position three-way solenoid valve is installed on the first oil supply pipe 42 and the second oil supply pipe 43. When the shaft 12 is in a low-speed or low-pressure state, the two-position three-way solenoid valve cuts off the second oil supply pipe 43 and opens the first oil supply pipe 42; while when the shaft 12 is in a high-speed or high-pressure state, the two-position three-way solenoid valve cuts off the first oil supply pipe 42 and opens the second oil supply pipe 43.

[0070] In summary, the hydrostatic bearing system and hydrostatic turntable of this application, through the oil supply assembly 40, control assembly 60, detection assembly 50, throttle 20, and liquid resistor 30, enable the bearing 10 to be connected between the oil supply assembly 40 and the liquid resistor 30 or the throttle 20 under different operating conditions. This results in different hydraulic pressures of the oil film between the shaft body 11 and the shaft core 12, ultimately increasing the load-bearing range of the hydrostatic bearing, preventing the bearing 10 from vibrating or jamming, and avoiding oil film rupture. Furthermore, in this embodiment, by limiting the maximum depth A of the liquid resistance groove 33 in the liquid resistor 30, the oil film rigidity of the shaft core 12 is moderate under low speed or low pressure conditions, and the friction between the shaft core 12 and the oil film is relatively small.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0073] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hydrostatic bearing system, characterized in that, include: The bearing (10) includes a shaft body (11) and a shaft core (12), the shaft core (12) is disposed through the shaft body (11), and a static pressure cavity is provided between the shaft body (11) and the shaft core (12); Throttling device (20), the throttle device (20) is connected to the static pressure chamber, and the throttle device (20) is used to adjust the stiffness of the oil film in the static pressure chamber; A liquid resistor (30) is disposed on the shaft (11). The liquid resistor (30) is connected to the static pressure chamber. The liquid resistor (30) is used to apply a fixed liquid resistance to the oil film in the static pressure chamber. The fixed liquid resistance applied by the liquid resistor (30) to the oil film is less than the minimum liquid resistance applied by the throttle (20) to the oil film. Oil supply assembly (40), which is connected to the throttle (20) and the liquid resistor (30) respectively; A detection component (50) is disposed on the bearing (10), and the detection component (50) is used at least to detect the rotational speed of the shaft core (12) and the load capacity of the shaft core (12); A control component (60) is connected to the oil supply component (40) and electrically connected to the detection component (50); When the rotational speed of the shaft core (12) is less than a first predetermined value or the load of the shaft core (12) is less than a second predetermined value, the control component (60) controls the oil supply component (40) to connect with the liquid resistor (30) and controls the oil supply component (40) to disconnect from the throttle (20); when the rotational speed of the shaft core (12) is greater than or equal to the first predetermined value or the load of the shaft core (12) is greater than or equal to the second predetermined value, the control component (60) controls the oil supply component (40) to disconnect from the liquid resistor (30) and controls the oil supply component (40) to connect with the throttle (20).

2. The hydrostatic bearing system according to claim 1, characterized in that, The liquid resistor (30) is provided with a hydraulic chamber, and the liquid resistor is also provided with a first oil inlet (31) and a first oil outlet (32). The two ends of the first oil inlet (31) are respectively connected to the hydraulic chamber and the oil supply assembly (40), and the two ends of the first oil outlet (32) are respectively connected to the hydraulic chamber and the static pressure chamber.

3. The hydrostatic bearing system according to claim 2, characterized in that, The liquid resistor (30) includes: The body (301) is fixed to the outer peripheral surface of the shaft (11). The body (301) has a first surface (311) opposite to the outer peripheral surface of the shaft (11) and a second surface (312) opposite to the first surface (311). The first oil inlet (31) and the first oil outlet (32) both extend from the first surface (311) to the second surface (312). The second surface (312) of the body (301) is provided with a liquid resistance groove (33). A baffle (302) is disposed on the second surface (312) of the body (301), and the baffle (302) and the throttle (20) surround the hydraulic cavity.

4. The hydrostatic bearing system according to claim 3, characterized in that, Along the direction of the liquid resistor (30) near the shaft (11), the maximum depth A of the liquid resistance groove (33) satisfies the relationship: 0.05mm≤A≤0.2mm.

5. The hydrostatic bearing system according to claim 3, characterized in that, The throttle (20) is connected to the liquid resistor (30), and the throttle (20) includes a second oil inlet (213) and a second oil outlet (2113); The liquid resistor (30) is provided with a first clearance hole (34) and a second clearance hole (35). The two ends of the first clearance hole (34) are respectively connected to the second oil inlet hole (213) and the oil supply assembly (40). The two ends of the second clearance hole (35) are respectively connected to the second oil outlet hole (2113) and the static pressure chamber.

6. The hydrostatic bearing system according to claim 5, characterized in that, The liquid resistor (30) has a first sealing cavity (36) on the side near the throttle (20), the first clearance hole (34) penetrates the first sealing cavity (36), and a first sealing element is embedded in the first sealing cavity (36); and / or, The liquid resistor (30) has a second sealing cavity (37) on the side near the throttle (20), the second clearance hole (35) passes through the second sealing cavity (37), and a second sealing element is embedded in the second sealing cavity (37).

7. The hydrostatic bearing system according to any one of claims 1 to 6, characterized in that, The control component (60) includes: A solenoid valve (62) is disposed between the bearing (10) and the oil supply assembly (40). The solenoid valve (62) has a first position in which the oil supply assembly (40) is connected to the liquid resistor (30) and disconnected from the throttle (20), and a second position in which the oil supply assembly (40) is disconnected from the liquid resistor (30) and connected to the throttle (20). The controller (61) is electrically connected to the detection component (50) and the solenoid valve (62) respectively. The controller (61) is used to compare the rotational speed of the shaft core (12) with the first predetermined value and the load of the bearing (10) with the second predetermined value, so as to control the solenoid valve (62) to switch between the first position and the second position.

8. The hydrostatic bearing system according to any one of claims 1 to 6, characterized in that, The detection component (50) includes: A speed sensor (51) is disposed on the shaft core (12) and is electrically connected to the control component (60); A pressure sensor (52) is disposed on the shaft core (12) and is electrically connected to the control component (60).

9. The hydrostatic bearing system according to any one of claims 1 to 6, characterized in that, The oil supply assembly (40) includes: Hydraulic station (41); The first oil supply pipe (42) is connected at both ends to the liquid resistor (30) and the hydraulic station (41), respectively. The second oil supply pipe (43) is connected at both ends to the throttle (20) and the hydraulic station (41) respectively, and the control component (60) is installed on the first oil supply pipe (42) and the second oil supply pipe (43).

10. A hydrostatic rotary table, characterized in that, The hydrostatic turntable includes the hydrostatic bearing system according to any one of claims 1 to 9.

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