A high-precision rotary table device for a vertical grinding machine

Abstract

The application relates to a high-precision rotary worktable device for a vertical grinding machine. The application comprises a base, a radial static pressure support installed on the base, an axial static pressure thrust support, an inner sealing ring and an outer sealing ring respectively provided with a pipe joint, a connecting disc connected with a cylinder, a rotor of a torque motor installed on the connecting disc, an angle encoder, a stator of the angle encoder connected with a thrust ring through a mounting seat, a cable of the angle encoder introduced into and extended to a lower end of an inner hole of the radial static pressure support, a rotor of the angle encoder connected with the connecting disc through a positioning disc and a signaling disc, a conductive slip ring, a rotor of the conductive slip ring installed on the signaling disc, a stator connected with the mounting seat through a centering shaft, a cable on the stator introduced into an inner hole of the centering shaft and extended to the lower end of the inner hole of the radial static pressure support, and a suction disc worktable connected with the connecting disc through the positioning disc. The application enhances the working stability and use reliability of the vertical grinding machine in grinding parts.

Description

Technical Field

[0001] This invention relates to the field of rotary table technology, and in particular to a high-precision rotary table device for a vertical grinding machine. Background Technology

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

[0003] The hydrostatic rotary table of the existing vertical grinding machine has the following defects: I. The hydrostatic guide rail support of the hydrostatic rotary table is achieved through the radial upper and lower hydrostatic chambers of the main spindle, the axial upper and lower hydrostatic chambers, and the peripheral auxiliary hydrostatic chambers. There are a large number of hydrostatic chambers, the manufacturing process of the parts is complex, and the assembly accuracy requirements are high and the manufacturing cost is also high.

[0004] 2. The radial hydrostatic guide rail support of the hydrostatic rotary table is achieved through the upper and lower radial hydrostatic chambers of the spindle. The upper and lower radial hydrostatic chambers of the spindle are supplied with oil through the same pipeline, which enters the hydrostatic chamber through the built-in slit throttle to form the hydrostatic guide rail. There is no feedback between the hydrostatic guide rails, so 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] III. The axial hydrostatic guide rail support of the hydrostatic rotary table is achieved through the upper and lower axial hydrostatic chambers of the main spindle and the peripheral auxiliary hydrostatic chambers. The upper and lower axial hydrostatic chambers of the main spindle are fed by the same pipeline, passing through an external diaphragm throttle to form the hydrostatic guide rails. The pressure in the hydrostatic chambers is easily affected by the elastic characteristics of the diaphragm itself. The strength of the diaphragm's elasticity directly affects the axial feedback capability. Simultaneously, sealing the diaphragm feedback throttle is difficult, leading to serious leakage, which is detrimental to environmental protection. The upper and lower axial hydrostatic supports of the main spindle and the peripheral auxiliary hydrostatic supports support the same rotary table; the two support surfaces are over-positioned, making manufacturing difficult and hindering the improvement of axial accuracy.

[0006] IV. The hydrostatic guide rail support of the hydrostatic rotary table supports the spindle and the table. The spindle and the table are rigidly connected. The torque motor is installed at the lower end of the spindle and drives the rotation of the spindle and the table. The overall structure is complex and the axial dimension is large, resulting in a large bed height for the rotary table and high manufacturing cost. In particular, when the vertical grinding machine uses a sunken foundation and centralized water supply, the torque motor and angle encoder are close to the bottom of the bed. The torque motor, angle encoder and their cables are prone to burnout due to water entering the pit, which increases the randomness of vertical grinding machine failure and thus affects the production efficiency of ground parts. At the same time, the angle encoder is installed at the lower end of the spindle, which makes installation, adjustment and maintenance difficult.

[0007] 5. The hydrostatic rotary table has a large number of hydrostatic guide rail supports, resulting in a large load on the oil supply pump 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 complex structure, high assembly precision requirements, complex manufacturing process and high manufacturing cost of hydrostatic rotary tables in the prior art.

[0009] To solve the above-mentioned technical problems, the present invention provides a high-precision rotary table device for a vertical grinding machine, comprising: The base is mounted on the machine tool bed; A radial hydrostatic support is mounted on the base, and the radial hydrostatic support is equipped with an inner sealing ring, an outer sealing ring, and a feedback oil circuit pipe joint. An axial hydrostatic thrust bearing is installed on a thrust ring. The inner sealing ring and the outer sealing ring are respectively equipped with pipe joints for supplying oil to the axial hydrostatic thrust bearing and the radial hydrostatic bearing respectively. A receiving plate, connected to a cylinder, on which the rotor of a torque motor is mounted; An angle encoder is provided with a mounting base at the upper end of the radial hydrostatic support. The stator of the angle encoder is connected to the thrust ring through the mounting base. The cable of the angle encoder is introduced into and extends to the lower end of the inner hole of the radial hydrostatic support. The rotor of the angle encoder is connected to the receiving plate through 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 transmitter, and the stator of the conductive slip ring is connected to the mounting base 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 hydrostatic support. The suction cup worktable is connected to the receiving plate via a positioning plate, and the cable between the suction cup worktable and the conductive slip ring is also connected.

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

[0011] In one embodiment of the present invention, it further includes ten axial hydrostatic supports, one three-way oil distribution block and two six-way oil distribution blocks, wherein the ten axial hydrostatic supports are evenly arranged circumferentially between the base and the receiving plate; Each of the six-way oil distribution blocks is connected to five second oil passages and one third oil passage. Each of the six-way oil distribution blocks is connected to the corresponding five axial hydrostatic supports through its five second oil passages. Each of the six-way oil distribution blocks is connected to the three-way oil distribution block through its third oil passage. The three-way oil distribution block is connected to the oil inlet pipe joint set on the base through its third oil passage.

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

[0013] In one embodiment of the present invention, the pipe joints corresponding to the oil inlet of the radial hydrostatic support and the oil inlet of the axial hydrostatic thrust support 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 pump.

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

[0015] In one embodiment of the present invention, a first adjusting plate is further provided between the receiving plate and the radial hydrostatic support. The first adjusting plate is used to adjust the axial clearance between the axial hydrostatic support and the receiving plate, and the axial clearance between the axial hydrostatic thrust support and the cylinder.

[0016] In one embodiment of the present invention, a second adjusting plate is provided between the signal transmitting plate and the positioning plate, the second adjusting plate being 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 equipped with a cooling pipe joint for cooling the torque motor, and a pressure cap 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 seal is provided between the pressure cover and the base, a second O-ring seal is provided between the radial hydrostatic support and the base; a first rotary seal is provided between the thrust ring and the receiving plate, a second rotary seal is provided between the mounting sleeve of the rotor of the torque motor and the base, and a third rotary seal is provided between the second cover plate, the pressure cover and the mounting sleeve.

[0019] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses a high-precision rotary table device for a vertical grinding machine. It integrates functional components such as a radial hydrostatic support, an axial hydrostatic thrust support, a receiving plate, a suction cup table, a torque motor, a conductive slip ring, and an angle encoder onto a base, forming an integrated modular structure. In particular, the three-sided closed hydrostatic structure layout enhances structural rigidity and overall table stability, effectively reduces axial dimensions, and facilitates compact design and optimized installation space.

[0020] This invention simplifies the overall structure of the high-precision rotary table for vertical grinding machines, resulting in a smaller axial dimension, a three-sided closed hydrostatic guideway with built-in feedback, and improves the rotational accuracy of the rotary table and the service life of its components. It also reduces the impact of machine tool-specific and external factors on grinding accuracy and service life, thereby enhancing the working stability and reliability of ground parts. Furthermore, it effectively improves the interchangeability of parts on the rotary table, significantly reduces manufacturing costs, facilitates adjustment and maintenance, expands the intelligent and stable operation capabilities of vertical grinding machines, and strengthens their market competitiveness. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the high-precision rotary table device for vertical grinding machines according to the present invention.

[0023] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0024] Figure 3 yes Figure 1 A magnified view of a portion of point B in the middle.

[0025] Figure 4 yes Figure 1 A magnified view of a portion of point C.

[0026] Figure 5 This is a top view of the high-precision rotary table device (so it is a receiving plate or suction cup table) for vertical grinding machines according to the present invention.

[0027] Explanation of reference numerals in the instruction manual: 1. Base; 2. Receiving plate; 3. Suction cup worktable; 4. Axial hydrostatic support; 5. Pipe joint; 6. Right-angle pipe joint; 7. Transition pipe; 8. First cover plate; 9. Pressure cap; 10. First O-ring seal; 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 hydrostatic support; 19. Mounting base; 20. Signal transmitter; 2 1. Second adjusting plate; 24. Positioning plate; 25. Thrust ring; 26. First rotary seal ring; 28. Axial hydrostatic thrust bearing; 30. First adjusting plate; 31. Cylinder; 33. Second rotary seal ring; 34. Oil return pipe joint; 35. Cooling pipe joint; 36. Second O-ring seal ring; 37. Outer sealing ring; 39. Feedback oil circuit pipe joint; 40. Inner sealing ring; 41. Oil inlet pipe joint; 42. Six-way oil distributor block; 43. Three-way oil distributor block. Detailed Implementation

[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 and implement the present invention. However, the embodiments described are not intended to limit the present invention.

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

[0030] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0031] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this 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 according to the present invention includes: Base 1, mounted on the machine tool bed; A radial hydrostatic support 18 is mounted on the base 1. The radial hydrostatic support 18 is equipped with an inner sealing ring 40, an outer sealing ring 37, and a feedback oil circuit pipe joint 39. An axial hydrostatic thrust bearing 28 is installed on a thrust ring 25. The inner sealing ring 40 and the outer sealing ring 37 are respectively equipped with pipe joints 5 for supplying oil to the axial hydrostatic thrust bearing 28 and the radial hydrostatic bearing 18 respectively. The receiving plate 2 is connected to the cylinder 31, and the rotor of the torque motor 13 is installed on the receiving plate 2; An angle encoder 17 is provided with a mounting base 19 at the upper end of the radial hydrostatic support 18. The stator of the angle encoder 17 is connected to the thrust ring 25 through the mounting base 19. The cable of the angle encoder 17 is introduced into and extends to the lower end of the inner hole of the radial hydrostatic support 18. The rotor of the angle encoder 17 is connected to the receiving plate 2 through the positioning plate 24 and the signal transmitting plate 20. A conductive slip ring 16, the rotor of which is mounted on the signal transmitter disk 20, and the stator of which is connected to the mounting base 19 via a centering shaft 15, wherein 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 hydrostatic support 18. The suction cup worktable 3 is connected to the receiving plate 2 via the positioning plate 24, and the cable between the suction cup worktable 3 and the conductive slip ring 16 is connected.

[0033] By organically integrating functional components such as the radial hydrostatic support 18, axial hydrostatic thrust support 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 structure layout enhances structural rigidity and overall worktable stability, effectively reducing axial dimensions and facilitating compact design and optimized installation space. By integrating the conductive slip ring 16, angle encoder 17, and suction cup cable into a single wiring configuration, stable transmission of electrical signals, angle signals, and magnetic power supply during rotary motion is achieved, avoiding cable tangling or poor contact issues and enhancing the response accuracy and execution reliability of the grinding machine's CNC system.

[0034] In one embodiment, the radial hydrostatic support 18 is provided with four hydrostatic chambers, and two opposite hydrostatic chambers are symmetrically arranged along the symmetrical cross section of the radial hydrostatic support 18. The feedback oil circuit connector 39 connects the two symmetrically arranged hydrostatic chambers through the first oil circuit pipe.

[0035] In one embodiment, refer to Figure 5 As shown, it also includes ten axial hydrostatic supports 4, one three-way oil distribution block 43 and two six-way oil distribution blocks 42. The ten axial hydrostatic supports 4 are evenly arranged circumferentially between the base 1 and the receiving plate 2. Each of the six-way oil distribution blocks 42 is connected to five second oil passages and one third oil passage. Each of the six-way oil distribution blocks 42 is connected to the corresponding five axial hydrostatic supports 4 through its five second oil passages. Each of the six-way oil distribution blocks 42 is connected to the three-way oil distribution block 43 through its third oil passage. The three-way oil distribution block 43 is connected to the oil inlet pipe joint 41 provided on the base 1 through its third oil passage.

[0036] In one embodiment, a transition pipe 7 is provided axially inside the base 1, the oil inlet pipe connector 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 connector 6, and the right-angle pipe connector 6 is connected to the three-way oil distribution block 43 through a pipe connector 5.

[0037] With the above configuration, the radial hydrostatic support 18 has 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 distribution block 43 and a six-way oil distribution block 42 to ensure stable oil supply and balanced pressure at each support point, further enhancing the system's load-bearing capacity and resistance to eccentric loads, and ensuring stable processing of large or heavy workpieces. A feedback oil circuit is provided between the radial hydrostatic chambers, forming an automatic pressure regulation loop between the radially symmetrical hydrostatic chambers. When one side bears a large load, the feedback system automatically adjusts the oil supply pressure to achieve dynamic force balance, thereby enhancing the adaptive capability of the worktable and its anti-interference performance during grinding.

[0038] In one embodiment, the pipe joints 5 corresponding to the oil inlet of the radial hydrostatic support 18 and the oil inlet of the axial hydrostatic thrust support 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 pump.

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

[0040] In one embodiment, a first adjusting plate 30 is further provided between the receiving plate 2 and the radial hydrostatic support 18. The first adjusting plate 30 is used to adjust the axial clearance between the axial hydrostatic support 4 and the receiving plate 2, and the axial clearance between the axial hydrostatic thrust support 28 and the cylinder 31.

[0041] In one embodiment, a second adjusting plate 21 is provided between the signal transmitting plate 20 and the positioning plate 24. The second adjusting 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 equipped with a cooling pipe joint 35 for cooling the torque motor 13, and a pressure cap 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 seal 10 is provided between the pressure cover 9 and the base 1, a second O-ring seal 36 is provided between the radial hydrostatic support 18 and the base 1; a first rotary seal 26 is provided between the thrust ring 25 and the receiving plate 2, a second rotary seal 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 12 is provided between the second cover plate 11, the pressure cover 9 and the mounting sleeve 14.

[0044] In actual operation, the operator sequentially connects the oil inlet of the radial hydrostatic support 18, the oil inlet of the axial hydrostatic support 4, the oil inlet of the axial hydrostatic thrust support 28, and the pipeline on the machine tool hydraulic oil tank; connects the two return oil joints to the return oil pipeline of the machine tool oil tank pump; connects the cooling water circulation pipeline of the torque motor 13; connects the chuck circuit; and connects the torque motor 13, the angle encoder 17, and the machine tool CNC system circuit. Start the oil supply pump, oil extraction pump, and cooling water pump, and adjust the pressure of each oil circuit pressure reducing valve to make the suction cup worktable 3 float. The pressure of the axial hydrostatic support 4 is adjusted by the built-in capillary throttle, which is the axial load of the hydrostatic rotary worktable and is used to support the weight of the worktable and parts. The pressure of the axial hydrostatic thrust support 28 is adjusted by the built-in capillary throttle and is used to control the floating amount of the worktable. The pressure of the radial hydrostatic support 18 is adjusted by the built-in gap throttle and is the radial load of the hydrostatic rotary worktable. There is a pressure feedback function between the symmetrical radial hydrostatic chambers, which can automatically adjust the pressure between the symmetrical radial hydrostatic supports 18 until the pressure values ​​are the same. Magnetize the suction cup, and the torque motor 13 is energized and drives the worktable (suction cup) to rotate on the hydrostatic bearing through the signal of the angle encoder 17, and stabilizes a certain speed for grinding the workpiece.

[0045] Through the above configuration, the hydrostatic rotary table achieves a simplified overall structure, small axial dimensions, three-sided closed hydrostatic pressure with built-in feedback, low manufacturing cost, low energy consumption, stable rotation, and high precision. It avoids the impact of sudden events on the production efficiency of some key components of the vertical mill, enhances the working stability and reliability of the rotary table of the vertical mill, effectively improves the interchangeability of parts of the rotary table of the vertical mill, facilitates adjustment and maintenance, expands the intelligent and stable operation functions of the vertical mill, and enhances its strong market competitiveness.

[0046] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within 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: The base (1) is installed on the machine tool bed; A radial hydrostatic support (18) is installed on the base (1). The radial hydrostatic support (18) is equipped with an inner sealing ring (40), an outer sealing ring (37), and a feedback oil circuit pipe joint (39). An axial hydrostatic thrust bearing (28) is installed on a thrust ring (25). The inner sealing ring (40) and the outer sealing ring (37) are respectively equipped with pipe fittings (5) for supplying oil to the axial hydrostatic thrust bearing (28) and the radial hydrostatic bearing (18) respectively. A receiving plate (2) is connected to a cylinder (31), and the rotor of a torque motor (13) is mounted on the receiving plate (2); An angle encoder (17) is provided with a mounting base (19) at the upper end of the radial hydrostatic support (18). The stator of the angle encoder (17) is connected to the thrust ring (25) through the mounting base (19). The cable of the angle encoder (17) is introduced into and extends to the lower end of the inner hole of the radial hydrostatic support (18). The rotor of the angle encoder (17) is connected to the receiving plate (2) through the positioning plate (24) and the signal transmitting plate (20). A conductive slip ring (16) is mounted on the signal transmitter (20). The stator of the conductive slip ring (16) is connected to the mounting base (19) via a centering shaft (15). 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 hydrostatic support (18). The suction cup worktable (3) is connected to the receiving plate (2) via the positioning plate (24) and the cable between the suction cup worktable (3) and the conductive slip ring (16) is connected. It also includes ten axial hydrostatic supports (4), one three-way oil distribution block (43) and two six-way oil distribution blocks (42), with the ten axial hydrostatic supports (4) evenly arranged circumferentially between the base (1) and the receiving plate (2); Each of the six-way oil distribution blocks (42) is connected to five second oil passages and one third oil passage. Each of the six-way oil distribution blocks (42) is connected to the corresponding five axial hydrostatic supports (4) through its five second oil passages. Each of the six-way oil distribution blocks (42) is connected to the three-way oil distribution block (43) through its third oil passage. The three-way oil distribution block (43) is connected to the oil inlet pipe joint (41) set on the base (1) through its third oil passage.

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

3. The high-precision rotary table device for a vertical grinding machine according to claim 1, characterized in that, A transition pipe (7) is provided axially inside 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). The right-angle pipe joint (6) is connected to the three-way oil distribution block (43) through the pipe joint (5).

4. The high-precision rotary table device for a vertical grinding machine according to claim 1, characterized in that, The oil inlet of the radial hydrostatic support (18) and the corresponding pipe joint (5) at the oil inlet of the axial hydrostatic thrust support (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 pump.

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

6. A high-precision rotary table device for a vertical grinding machine according to claim 5, characterized in that, A first adjusting plate (30) is also provided between the receiving plate (2) and the radial hydrostatic support (18). The first adjusting plate (30) is used to adjust the axial clearance between the axial hydrostatic support (4) and the receiving plate (2), as well as the axial clearance between the axial hydrostatic thrust support (28) and the cylinder (31).

7. A 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 transmitter (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).

8. A high-precision rotary table device for a vertical grinding machine according to claim 7, characterized in that, The stator of the torque motor (13) is equipped with a cooling pipe joint (35) for cooling the torque motor (13), and a pressure cap (9) is provided on the base (1) to press the stator of the torque motor (13) onto the base (1).

9. A high-precision rotary table device for a vertical grinding machine according to claim 8, characterized in that, A second cover plate (11) is installed on the pressure cap (9), a first O-ring seal (10) is provided between the pressure cap (9) and the base (1), a second O-ring seal (36) is provided between the radial hydrostatic support (18) and the base (1); a first rotary seal (26) is provided between the thrust ring (25) and the receiving plate (2), a second rotary seal (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 (12) is provided between the second cover plate (11), the pressure cap (9) and the mounting sleeve (14).

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