High-precision rotating table device for vertical grinding machine

Abstract

The invention relates to a high-precision rotating table device for a vertical grinding machine. The device comprises a base; the radial static pressure bearing is mounted on the base; the axial static pressure thrust bearing, the inner sealing ring and the outer sealing ring are respectively provided with a pipe joint; the receiving disc is connected with the cylinder, and a rotor of the torque motor is mounted on the receiving disc; a stator of the angle encoder is connected with the thrust ring through a mounting seat, a cable of the angle encoder is led in and extends to the lower end of an inner hole of the radial static pressure bearing, and a rotor of the angle encoder is connected to a receiving disc through a positioning disc and a signaling disc; a rotor of the conductive slip ring is mounted on the signaling disc, a stator of the conductive slip ring is connected with the mounting seat through a centering shaft, and a cable on the stator is led into an inner hole of the centering shaft and extends to the lower end of an inner hole of the radial static pressure bearing; and the sucking disc workbench is connected with the receiving disc through a positioning disc. The working stability and the use reliability of grinding parts of the vertical grinding machine are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary tables, in particular to a high-precision rotary table device for a vertical grinding machine. Background Art

[0002] Vertical grinding machines are widely used in precision grinding, especially the design and manufacture of hydrostatic rotary tables, which have a decisive influence on grinding accuracy.

[0003] The static pressure rotary table of the vertical grinder in the prior art has the following defects: 1. The hydrostatic guide rail support of the hydrostatic rotary table is completed by the upper and lower hydrostatic cavities in the radial direction of the main shaft, the upper and lower hydrostatic cavities in the axial direction, and the peripheral auxiliary hydrostatic cavities. There are a large number of hydrostatic cavities, the manufacturing process of the parts is complex, and the assembly precision requirements are high and the manufacturing cost is also high.

[0004] 2. The radial hydrostatic guide rail support of the hydrostatic rotary table is completed through the radial upper and lower hydrostatic chambers of the spindle. The oil inlet to the radial upper and lower hydrostatic chambers of the spindle is from the same pipeline, and enters the hydrostatic chamber through the built-in gap throttle to form a hydrostatic guide rail. There is no feedback between the hydrostatic guide rails, and the pressure of the hydrostatic chamber cannot be automatically adjusted. The radial load is relatively weak, and the radial rigidity and rotation accuracy are low.

[0005] 3. The axial static pressure guide rail support of the hydrostatic rotary table is completed by the upper and lower static pressure chambers of the main spindle and the peripheral auxiliary static pressure chambers. The upper and lower static pressure chambers of the main spindle are fed with oil from the same pipeline, and enter the upper and lower static pressure chambers of the main spindle through the external diaphragm throttle to form the hydrostatic guide rail. The pressure of the hydrostatic chamber is easily affected by the elastic properties of the diaphragm itself. The elasticity of the diaphragm directly affects the axial feedback capability. At the same time, the diaphragm feedback throttle is difficult to seal, resulting in serious leakage, which is not conducive to environmental protection. The upper and lower hydrostatic supports of the main spindle and the peripheral auxiliary hydrostatic supports support the same rotary table. The two supporting surfaces are over-positioned, which is difficult to manufacture and is not conducive to improving the axial accuracy.

[0006] 4. The hydrostatic guide rail support of the hydrostatic rotary table supports the main shaft and the worktable. The main shaft and the worktable are rigidly connected. The torque motor is installed at the lower end of the main shaft and drives the rotation of the main shaft and the worktable. The overall structure is complex and the axial dimension is large, which leads to a large height dimension of the bed for installing the rotary table and high manufacturing cost. Especially when the vertical grinder adopts a sunken foundation and centralized water supply, the torque motor and the angle encoder are close to the bottom of the bed. The torque motor, the angle encoder and their cables are easily burned due to water entering the pit, which increases the randomness of vertical grinder failures and affects the production efficiency of grinding parts. At the same time, the angle encoder is installed at the lower end of the spindle, which is difficult to install, adjust and maintain.

[0007] 5. The hydrostatic rotary table has a large number of hydrostatic guide rail supports, which results in a large oil supply pump load and high energy consumption. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the problems of the hydrostatic rotary table in the prior art, such as complex structure and high assembly precision requirements, which lead to complex manufacturing process and high manufacturing cost.

[0009] In order to solve the above technical problems, the present invention provides a high-precision rotary table device for a vertical grinder, comprising: Base, installed on the machine bed; A radial static pressure support is installed on the base, and the radial static pressure support is equipped with an inner sealing ring, an outer sealing ring, and a feedback oil line pipe joint; An axial static pressure thrust bearing is mounted on the thrust ring, and the inner sealing ring and the outer sealing ring are respectively mounted with pipe joints for supplying oil to the axial static pressure thrust bearing and the radial static pressure bearing respectively; A connecting plate is connected to the cylinder, and a rotor of a torque motor is installed on the connecting plate; An angle encoder, wherein a mounting seat is provided at the upper end of the radial static pressure support, the stator of the angle encoder is connected to the thrust ring via the mounting seat, the cable of the angle encoder is introduced into and extends to the lower end of the inner hole of the radial static pressure support, and the rotor of the angle encoder is connected to the connecting plate via a positioning plate and a signal transmitting plate; A conductive slip ring, wherein the rotor of the conductive slip ring is mounted on the signal transmitting disk, the stator of the conductive slip ring is connected to the mounting seat via a centering shaft, and the cable on the stator of the conductive slip ring is introduced into the inner hole of the centering shaft and extends to the lower end of the inner hole of the radial static pressure support; The suction cup workbench is connected to the connecting plate through the positioning plate, and the cable between the suction cup workbench and the conductive slip ring is connected.

[0010] In one embodiment of the present invention, the radial static pressure support is provided with four static pressure chambers, and two opposite static pressure chambers are symmetrically arranged along the symmetrical section of the radial static pressure support, and the feedback oil circuit pipe joint is connected to the two symmetrically arranged static pressure chambers through a first oil circuit pipeline.

[0011] In one embodiment of the present invention, it further comprises ten axial static pressure supports, a three-way oil distributor block and two six-way oil distributor blocks, wherein the ten axial static pressure supports are evenly arranged along the circumferential direction between the base and the receiving plate; Each of the six-way oil distribution blocks is connected to five second oil pipelines and one third oil pipeline, and each of the six-way oil distribution blocks is connected to the corresponding five axial static pressure supports through its own five second oil pipelines; each of the six-way oil distribution blocks is connected to the three-way oil distribution block through its own third oil pipeline, and the three-way oil distribution block is connected to the oil inlet pipe joint arranged on the base through the third oil pipeline.

[0012] In one embodiment of the present invention, a transition pipe is axially arranged in the base, the oil inlet pipe joint is connected to one end of the transition pipe, the other end of the transition pipe is connected to a right-angle pipe joint, and the right-angle pipe joint is connected to the three-way oil distribution block through a pipe joint.

[0013] In one embodiment of the present invention, the pipe joints corresponding to the oil inlet of the radial static pressure bearing and the oil inlet of the axial static pressure thrust bearing are respectively connected to the machine tool hydraulic oil tank; the base is also provided with a return oil pipe joint connected to the machine tool oil tank oil pump.

[0014] In one embodiment of the present invention, a first cover plate is installed at the bottom end of the receiving disc, and the receiving disc is also installed with a cylinder located outside the radial static pressure support. The receiving disc is also connected to a mounting sleeve, and the rotor of the torque motor is mounted on the mounting sleeve.

[0015] In one embodiment of the present invention, a first adjustment plate is further provided between the receiving disc and the radial static pressure bearing, and the first adjustment plate is used to adjust the axial clearance between the axial static pressure bearing and the receiving disc, and the axial clearance between the axial static pressure thrust bearing and the cylinder.

[0016] In one embodiment of the present invention, a second adjustment plate is provided between the signal transmitting plate and the positioning plate, and the second adjustment plate is used to adjust the axial position between the rotor and the stator of the angle encoder.

[0017] In one embodiment of the present invention, the stator of the torque motor is installed with a cooling pipe joint for cooling the torque motor, and a pressure cover is provided on the base to press the stator of the torque motor onto the base.

[0018] In one embodiment of the present invention, a second cover plate is installed on the pressure cover, a first O-ring is arranged between the pressure cover and the base, and a second O-ring is arranged between the radial static pressure support and the base; a first rotating seal ring is arranged between the thrust ring and the receiving plate, a second rotating seal ring is arranged between the mounting sleeve of the rotor of the torque motor and the base, and a third rotating seal ring is arranged between the second cover plate, the pressure cover and the mounting sleeve.

[0019] The above technical solution of the present invention has the following advantages over the prior art: The high-precision rotary table assembly for vertical grinding machines described in this invention integrates functional components such as radial hydrostatic bearings, axial hydrostatic thrust bearings, a receiving plate, a suction cup table, a torque motor, conductive slip rings, and an angle encoder onto a base, creating an integrated modular structure. In particular, the three-sided closed hydrostatic structure layout improves structural rigidity and overall table stability, effectively reducing axial dimensions and facilitating a compact design and optimized installation space.

[0020] The present invention simplifies the overall structure of the high-precision rotary table of the vertical grinder, reduces the axial size, and adopts three-sided closed hydrostatic guide rails with built-in feedback, thereby improving the rotation accuracy of the rotary table of the vertical grinder and the service life of the components, and reducing the influence of the machine tool itself and external factors on the grinding accuracy and service life of the machine tool, thereby enhancing the working stability and use reliability of the grinding parts of the vertical grinder, and effectively improving the universal interchangeability of parts of the rotary table of the vertical grinder. The manufacturing cost is also greatly reduced, and adjustment and maintenance are convenient, which expands the intelligent and stable operation functions of the vertical grinder and its strong market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the high-precision rotary table device for the vertical grinder of the present invention.

[0023] Figure 2 yes Figure 1 A local enlarged schematic diagram of point A in the middle.

[0024] Figure 3 yes Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0025] Figure 4 yes Figure 1 A partial enlarged schematic diagram of point C in the middle.

[0026] Figure 5 It is a top view structural diagram of the high-precision rotary table device (and therefore the receiving plate and suction cup table) for the vertical grinder of the present invention.

[0027] Description of the accompanying drawings: 1. Base; 2. Connecting plate; 3. Suction cup workbench; 4. Axial static pressure bearing; 5. Pipe joint; 6. Right-angle pipe joint; 7. Transition pipe; 8. First cover plate; 9. Gland; 10. First O-ring; 11. Second cover plate; 12. Third rotary seal; 13. Torque motor; 14. Mounting sleeve; 15. Centering shaft; 16. Conductive slip ring; 17. Angle encoder; 18. Radial static pressure bearing; 19. Mounting seat; 20. Transmitter disk; 2 1. Second adjustment plate; 24. Positioning plate; 25. Thrust ring; 26. First rotary seal ring; 28. Axial static thrust bearing; 30. First adjustment plate; 31. Cylinder; 33. Second rotary seal ring; 34. Oil return pipe joint; 35. Cooling pipe joint; 36. Second O-ring; 37. Outer sealing ring; 39. Feedback oil line pipe joint; 40. Inner sealing ring; 41. Oil inlet pipe joint; 42. Six-way oil distributor; 43. Three-way oil distributor. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0029] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0030] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Reference Figures 1 to 4As shown, a high-precision rotary table device for a vertical grinding machine of the present invention comprises: Base 1, mounted on the machine tool bed; A radial static pressure support 18 is installed on the base 1. The radial static pressure support 18 is equipped with an inner sealing ring 40, an outer sealing ring 37, and a feedback oil pipe joint 39; An axial static pressure thrust bearing 28 is mounted on the thrust ring 25 , and the inner sealing ring 40 and the outer sealing ring 37 are respectively mounted with pipe joints 5 for supplying oil to the axial static pressure thrust bearing 28 and the radial static pressure bearing 18 respectively; A receiving plate 2 is connected to the cylinder 31, and a rotor of a torque motor 13 is mounted on the receiving plate 2; Angle encoder 17, a mounting seat 19 is provided at the upper end of the radial static pressure support 18, the stator of the angle encoder 17 is connected to the thrust ring 25 via the mounting seat 19, the cable of the angle encoder 17 is introduced and extended to the lower end of the inner hole of the radial static pressure support 18, and the rotor of the angle encoder 17 is connected to the connecting plate 2 via the positioning plate 24 and the signal transmitting plate 20; A conductive slip ring 16, the rotor of which is mounted on the signal transmitting disk 20, the stator of which is connected to the mounting seat 19 via a centering shaft 15, and the cables on the stator of the conductive slip ring 16 are introduced into the inner hole of the centering shaft 15 and extend to the lower end of the inner hole of the radial static pressure support 18; The suction cup workbench 3 is connected to the receiving plate 2 through the positioning plate 24 , and the cable between the suction cup workbench 3 and the conductive slip ring 16 is connected.

[0033] By organically integrating functional components such as the radial hydrostatic bearing 18, axial hydrostatic thrust bearing 28, receiving plate 2, suction cup worktable 3, torque motor 13, conductive slip ring 16, and angle encoder 17 onto the base 1, an integrated modular structure is formed. In particular, the adoption of a three-sided closed hydrostatic structural layout improves structural rigidity and the overall stability of the worktable, effectively reducing axial dimensions and facilitating a compact design and optimized installation space. By integrating the conductive slip ring 16, angle encoder 17, and suction cup cable wiring, electrical signals, angle signals, and magnetic power supply are all stably transmitted during rotary motion, avoiding cable entanglement or poor contact, and enhancing the response accuracy and execution reliability of the grinding machine's CNC system.

[0034] In one embodiment, the radial static pressure support 18 is provided with four static pressure chambers, and two opposite static pressure chambers are symmetrically arranged along the symmetrical section of the radial static pressure support 18, and the feedback oil circuit pipe joint 39 is connected to the two symmetrically arranged static pressure chambers through a first oil circuit pipeline.

[0035] In one embodiment, referring to Figure 5 As shown, it also includes ten axial static pressure supports 4, a three-way oil distribution block 43 and two six-way oil distribution blocks 42. The ten axial static pressure supports 4 are evenly arranged between the base 1 and the receiving plate 2 along the circumferential direction. Each of the six-way oil distribution blocks 42 is connected to five second oil pipelines and one third oil pipeline, and each of the six-way oil distribution blocks 42 is connected to the corresponding five axial static pressure supports 4 through its own five second oil pipelines; each of the six-way oil distribution blocks 42 is connected to the three-way oil distribution block 43 through its own third oil pipeline, and the three-way oil distribution block 43 is connected to the oil inlet pipe joint 41 arranged on the base 1 through the third oil pipeline.

[0036] In one embodiment, a transition pipe 7 is axially arranged in the base 1, the oil inlet pipe joint 41 is connected to one end of the transition pipe 7, and the other end of the transition pipe 7 is connected to a right-angle pipe joint 6, and the right-angle pipe joint 6 is connected to the three-way oil distribution block 43 through the pipe joint 5.

[0037] Through the above arrangement, the radial hydrostatic support 18 is equipped with four hydrostatic chambers, and the axial hydrostatic support 4 has ten support points evenly distributed along the circumference. The oil circuit is distributed through a three-way oil distributor 43 and a six-way oil distributor 42, ensuring stable oil supply and balanced pressure at each support point. This further enhances the system's load-bearing capacity and resistance to off-center loads, ensuring stable machining of large or eccentrically heavy workpieces. Feedback oil circuits are provided between the radial hydrostatic chambers, forming an automatic pressure regulation loop within the radially symmetrical hydrostatic chambers. When a heavy load is applied to one side, the feedback system automatically adjusts the oil supply pressure to achieve dynamic force balance, thereby enhancing the worktable's adaptive capabilities and anti-interference performance during the grinding process.

[0038] In one embodiment, the pipe joints 5 corresponding to the oil inlet of the radial static pressure bearing 18 and the oil inlet of the axial static pressure thrust bearing 28 are respectively connected to the machine tool hydraulic oil tank; the base 1 is also provided with a return oil pipe joint 34 connected to the machine tool oil tank oil pump.

[0039] In one embodiment, a first cover plate 8 is installed at the bottom end of the receiving disc 2, and the receiving disc 2 is also installed with a cylinder 31 located outside the radial static pressure support 18. The receiving disc 2 is also connected to a mounting sleeve 14, and the rotor of the torque motor 13 is installed on the mounting sleeve 14.

[0040] In one embodiment, a first adjustment plate 30 is further provided between the receiving disc 2 and the radial static pressure bearing 18 , and the first adjustment plate 30 is used to adjust the axial clearance between the axial static pressure bearing 4 and the receiving disc 2 , and the axial clearance between the axial static pressure thrust bearing 28 and the cylinder 31 .

[0041] In one embodiment, a second adjustment plate 21 is provided between the signal transmitting plate 20 and the positioning plate 24 . The second adjustment plate 21 is used to adjust the axial position between the rotor and the stator of the angle encoder 17 .

[0042] In one embodiment, the stator of the torque motor 13 is installed with a cooling pipe joint 35 for cooling the torque motor 13 , and a pressure cover 9 is provided on the base 1 to press the stator of the torque motor 13 onto the base 1 .

[0043] In one embodiment, a second cover plate 11 is installed on the pressure cover 9, a first O-ring 10 is provided between the pressure cover 9 and the base 1, and a second O-ring 36 is provided between the radial static pressure support 18 and the base 1; a first rotary seal ring 26 is provided between the thrust ring 25 and the receiving plate 2, a second rotary seal ring 33 is provided between the mounting sleeve 14 of the rotor of the torque motor 13 and the base 1, and a third rotary seal ring 12 is provided between the second cover plate 11, the pressure cover 9 and the mounting sleeve 14.

[0044] During the specific work, the operator sequentially connects the oil inlet of the radial static pressure support 18, the oil inlet of the axial static pressure support 4, the oil inlet of the axial static pressure thrust support 28 and the pipelines on the hydraulic oil tank of the machine tool; connects the two return oil joints and the return oil pipeline of the oil pump of the machine tool tank; connects the cooling water circulation pipeline of the torque motor 13; connects the line of the suction cup; connects the line of the torque motor 13, the angle encoder 17 and the CNC system of the machine tool. The oil supply pump, oil extraction pump, and cooling water pump are activated, and the pressures of the various oil pressure reducing valves are adjusted to lift the suction cup worktable 3. The pressure of the axial hydrostatic bearing 4 is adjusted via a built-in capillary restrictor, representing the axial load of the hydrostatic rotary table and supporting the weight of the table and parts. The pressure of the axial hydrostatic thrust bearing 28 is adjusted via a built-in capillary restrictor to control the lift of the table. The pressure of the radial hydrostatic bearing 18 is adjusted via a built-in slit restrictor, representing the radial load of the hydrostatic rotary table. The symmetrical radial hydrostatic cavities have a pressure feedback function, automatically adjusting the pressures between the symmetrical radial hydrostatic bearings 18 until they are at the same value. The suction cup is magnetized, and the torque motor 13 is energized. The torque motor 13, using signals from the angle encoder 17, drives the worktable (suction cup) to rotate on the hydrostatic bearing, maintaining a constant rotational speed for workpiece grinding.

[0045] Through the above settings, the hydrostatic rotary table realizes a simplified overall structure, small axial size, three-sided closed hydrostatic and built-in feedback, low manufacturing cost, low energy consumption, stable rotation and high precision, avoids the influence of some key components of the vertical mill being damaged by sudden events, thereby reducing production efficiency, enhances the working stability and use reliability of the vertical grinder rotary table, and effectively improves the parts interchangeability of the vertical grinder rotary table, facilitates adjustment and maintenance, and expands the intelligent and stable operation functions of the vertical grinder and its strong market competitiveness.

[0046] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-precision rotary table device for a vertical grinding machine, characterized in that: include: A base (1) is mounted on a machine tool bed; A radial static pressure support (18) is installed on the base (1), and the radial static pressure support (18) is equipped with an inner sealing ring (40), an outer sealing ring (37), and a feedback oil pipe joint (39); An axial static pressure thrust bearing (28) is mounted on the thrust ring (25), and the inner sealing ring (40) and the outer sealing ring (37) are respectively mounted with pipe joints (5) for respectively supplying oil to the axial static pressure thrust bearing (28) and the radial static pressure bearing (18); A connecting plate (2) is connected to the cylinder (31), and a rotor of a torque motor (13) is mounted on the connecting plate (2); An angle encoder (17), wherein a mounting seat (19) is provided at the upper end of the radial static pressure support (18), the stator of the angle encoder (17) is connected to the thrust ring (25) via the mounting seat (19), the cable of the angle encoder (17) is introduced into and extended to the lower end of the inner hole of the radial static pressure support (18), and the rotor of the angle encoder (17) is connected to the connecting plate (2) via a positioning plate (24) and a signal transmitting plate (20); A conductive slip ring (16), the rotor of the conductive slip ring (16) is mounted on the signal transmitting disk (20), the stator of the conductive slip ring (16) is connected to the mounting seat (19) via a centering shaft (15), and the cable on the stator of the conductive slip ring (16) is introduced into the inner hole of the centering shaft (15) and extends to the lower end of the inner hole of the radial static pressure support (18); The suction cup workbench (3) is connected to the connecting plate (2) via a positioning plate (24), and a cable is connected between the suction cup workbench (3) and the conductive slip ring (16).

2. A high-precision rotary table device for a vertical grinding machine according to claim 1, characterized in that: The radial static pressure support (18) is provided with four static pressure chambers, two of the opposite static pressure chambers are symmetrically arranged along the symmetrical section of the radial static pressure support (18), and the feedback oil circuit pipe joint (39) is connected to the two symmetrically arranged static pressure chambers through a first oil circuit pipeline.

3. The high-precision rotary table device for a vertical grinder according to claim 1, characterized in that: It also includes ten axial static pressure supports (4), a three-way oil distribution block (43) and two six-way oil distribution blocks (42), wherein the ten axial static pressure supports (4) are evenly arranged between the base (1) and the receiving plate (2) along the circumferential direction; Each of the six-way oil distribution blocks (42) is connected to five second oil pipelines and one third oil pipeline, and each of the six-way oil distribution blocks (42) is connected to the corresponding five axial static pressure supports (4) through its own five second oil pipelines; each of the six-way oil distribution blocks (42) is connected to the three-way oil distribution block (43) through its own third oil pipeline, and the three-way oil distribution block (43) is connected to the oil inlet pipe joint (41) provided on the base (1) through the third oil pipeline.

4. A high-precision rotary table device for a vertical grinding machine according to claim 3, characterized in that: A transition pipe (7) is axially arranged in the base (1); the oil inlet pipe joint (41) is connected to one end of the transition pipe (7); the other end of the transition pipe (7) is connected to a right-angle pipe joint (6); and the right-angle pipe joint (6) is connected to the three-way oil distribution block (43) via a pipe joint (5).

5. The high-precision rotary table device for a vertical grinding machine according to claim 1, characterized in that: The pipe joints (5) corresponding to the oil inlet of the radial static pressure bearing (18) and the oil inlet of the axial static pressure thrust bearing (28) are respectively connected to the hydraulic oil tank of the machine tool; the base (1) is also provided with an oil return pipe joint (34) connected to the oil pump of the machine tool tank.

6. The high-precision rotary table device for a vertical grinding machine according to claim 1, characterized in that: A first cover plate (8) is installed at the bottom end of the receiving disc (2), and a cylinder (31) located outside the radial static pressure support (18) is also installed on the receiving disc (2). The receiving disc (2) is also connected to a mounting sleeve (14), and the rotor of the torque motor (13) is mounted on the mounting sleeve (14).

7. The high-precision rotary table device for a vertical grinding machine according to claim 6, characterized in that: A first adjustment sheet (30) is further provided between the receiving disc (2) and the radial static pressure support (18), and the first adjustment sheet (30) is used to adjust the axial clearance between the axial static pressure support (4) and the receiving disc (2), and the axial clearance between the axial static pressure thrust support (28) and the cylinder (31).

8. The high-precision rotary table device for a vertical grinding machine according to claim 1, characterized in that: A second adjustment plate (21) is provided between the signal transmitting plate (20) and the positioning plate (24), and the second adjustment plate (21) is used to adjust the axial position between the rotor and the stator of the angle encoder (17).

9. The high-precision rotary table device for a vertical grinding machine according to claim 6, characterized in that: The stator of the torque motor (13) is installed with a cooling pipe joint (35) for cooling the torque motor (13), and a pressure cover (9) is provided on the base (1) to press the stator of the torque motor (13) onto the base (1).

10. The high-precision rotary table device for a vertical grinding machine according to claim 9, characterized in that: A second cover plate (11) is mounted on the gland (9), a first O-ring (10) is disposed between the gland (9) and the base (1), and a second O-ring (36) is disposed between the radial static pressure support (18) and the base (1); a first rotary seal (26) is disposed between the thrust ring (25) and the receiving plate (2), a second rotary seal (33) is disposed between the mounting sleeve (14) of the rotor of the torque motor (13) and the base (1), and a third rotary seal (12) is disposed between the second cover plate (11), the gland (9) and the mounting sleeve (14).

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