A new hydrostatic rotary table

Abstract

The utility model provides a novel static pressure rotary table belongs to mechanical technical field. It has solved the problem that the existing rotary table life is poor. The novel static pressure rotary table includes the workstation, the support cylinder fixed vertically in the workstation bottom and the cylinder base sleeved in the support cylinder outside, is equipped with motor and static pressure ring in the base vertically, and the motor includes rotor shaft, machine cylinder and stator core, and the rotor shaft upper end is fixedly connected with the workstation, and the support cylinder, base and static pressure ring form the oil channel among the three, and under the action of oil channel, the support cylinder and base form the axial support oil film, and the static pressure ring and support cylinder form the radial support oil film, and the machine cylinder is fixed on the base, and the static pressure ring is sleeved and fixed on the machine cylinder, bearing is equipped between the machine cylinder upper end and rotor shaft, and the bearing includes the outer ring fixedly connected with the machine cylinder and the inner ring fixedly connected with the rotor shaft, and the outer ring lower end is pressed on the stator core. The novel static pressure rotary table has long life.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a hydrostatic turntable, particularly a novel hydrostatic turntable. Background Technology

[0002] The hydrostatic rotary table is mainly used in precision and ultra-precision machine tools. Its structure is as proposed by the applicant (CN218612824U), including a worktable and a cylindrical base vertically arranged below the worktable. A spindle is coaxially arranged inside the base, with the upper end of the spindle extending out of the base and fixedly connected to the worktable. A motor for driving the spindle to rotate is also fixed on the base. The key feature is that an annular slot is formed between the base and the spindle. A ring body with a shape and size matching the slot is inserted into the slot, and the top and bottom walls of the ring body are respectively attached to the bottom wall of the worktable and the inner wall of the cylindrical body. A closed annular groove 1 is formed between the inner side wall of the ring body and the spindle, and a closed annular groove 2 is formed between the top wall of the ring body and the worktable. An annular oil groove is coaxially arranged on the outer wall of the ring body. An oil injection hole and an oil return hole that are connected to the oil groove are provided through the side wall of the base. An oil passage is formed inside the ring body so that the annular groove 1 and the annular groove 2 are connected to the oil groove.

[0003] In the aforementioned hydrostatic rotary table, an axial support oil film is formed between the worktable and the annulus. During actual operation, if the worktable is under heavy load and there is insufficient or uneven oil supply, it can easily cause the annulus and the worktable to seize up, affecting the operation and lifespan of the rotary table. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a novel hydrostatic rotary table with a long service life.

[0005] The objective of this utility model can be achieved through the following technical solution: A novel hydrostatic rotary table includes a worktable, a support cylinder vertically fixed to the bottom of the worktable, and a cylindrical base sleeved on the support cylinder. A motor and a hydrostatic ring are vertically arranged inside the base. The motor includes a rotor shaft, a barrel, and a stator core. The upper end of the rotor shaft is fixedly connected to the worktable. An oil passage is formed between the support cylinder, the base, and the hydrostatic ring. Under the action of the oil passage, an axial support oil film is formed between the support cylinder and the base, and a radial support oil film is formed between the hydrostatic ring and the support cylinder. The characteristic is that the barrel is fixed on the base, and the hydrostatic ring is sleeved and fixed on the barrel. A bearing is provided between the upper end of the barrel and the rotor shaft. The bearing includes an outer ring fixedly connected to the barrel and an inner ring fixedly connected to the rotor shaft, and the lower end of the outer ring presses against the stator core.

[0006] A bearing is added between the upper end of the barrel and the rotor shaft, and the lower end of the outer ring of the bearing presses against the stator core, so that the worktable always receives an upward support force, effectively preventing the support cylinder and the base from seizing due to uneven oil film, thereby improving the life and working stability of the hydrostatic turntable.

[0007] In the aforementioned novel hydrostatic rotary table, the rotor shaft and the worktable are fixedly connected by a connecting ring, which is coaxial with the rotor shaft. The bottom wall of the worktable presses against the outer wall of the connecting ring, and the top wall of the rotor shaft presses against the bottom of the connecting ring. This design provides more stable upward support for the worktable, thus more reliably achieving the goal of improving the lifespan and operational stability of the hydrostatic rotary table.

[0008] In the aforementioned novel hydrostatic rotary table, a ring-shaped lower step is formed on the bottom wall of the connecting ring and matches the upper end of the rotor shaft. The upper end of the rotor shaft is inserted into the lower step and pressed against the bottom wall of the lower step, while the bottom wall of the connecting ring presses against the top wall of the inner ring. The connecting ring serves both to connect the rotor shaft and the worktable and to cooperate with the stator core in the axial upper limit bearing. In other words, in this application, the connecting ring has a dual function, simplifying the structure and facilitating assembly.

[0009] In the aforementioned novel hydrostatic rotary table, the motor also includes an encoder. The worktable has a vertically penetrating central hole, and the encoder is positioned within this central hole. The rotor shaft is hollow, and a central shaft is coaxially mounted inside it. The lower end of the central shaft is fixed to a casing via a connector. The encoder consists of a moving part fixed to the rotor shaft and a stationary part fixed to the central shaft. A sealing element for sealing the opening of the central hole is fixed on the worktable. Positioning the motor encoder within the central hole of the worktable allows for top-mounted encoder operation, facilitating maintenance.

[0010] In the aforementioned novel hydrostatic rotary table, the sealing element includes a sealing cover, which is detachably fixed inside the upper end of the central hole, and a seal is formed between the outer wall of the sealing cover and the wall of the central hole. It has the advantages of simple structure and convenient installation.

[0011] In the aforementioned new hydrostatic rotary table, the shape and size of the outer wall of the sealing cover match the upper end of the central hole, and the sealing cover is locked in the central hole. Thus, the sealing cover can be installed by pressing it in.

[0012] In the aforementioned new hydrostatic rotary table, the top of the sealing cover has a vertically threaded hole, which is a blind hole. During use, the sealing cover can be easily removed by screwing a tool into the threaded hole, facilitating disassembly and assembly and enabling maintenance.

[0013] In the aforementioned novel hydrostatic rotary table, an annular groove is provided on the outer wall of the sealing cover, and a sealing ring is provided in the annular groove. The outer wall of the sealing ring contacts and seals with the inner wall of the central hole to enhance the sealing performance between the sealing cover and the central hole.

[0014] In the aforementioned new hydrostatic rotary table, the connecting component is a horizontally arranged connecting plate, and the lower end of the central shaft and the lower end of the barrel are both fixed to the connecting plate.

[0015] Compared with existing technologies, this novel hydrostatic rotary table has the following advantages: 1. A bearing is added between the upper end of the barrel and the rotor shaft, and the lower end of the outer ring of the bearing presses against the stator core, so that the worktable always has an upward support force, effectively preventing the support cylinder and the base from seizing due to uneven oil film, thereby improving the service life and working stability of the hydrostatic turntable.

[0016] 2. The connecting ring is used to connect the rotor shaft and the worktable, and also cooperates with the stator core to provide an axial upper limit bearing. In this application, the connecting ring has a dual function, which simplifies the structure and facilitates assembly. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the new hydrostatic rotary table.

[0018] Figure 2 This is a cross-sectional schematic diagram of the new hydrostatic rotary table.

[0019] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0020] In the diagram, 1. Workbench; 1a. Center hole; 2. Support cylinder; 3. Base; 3a. Oil inlet; 3b. Convex ring; 3c. Oil drain hole; 4. Motor; 4a. Rotor shaft; 4b. Machine barrel; 4c. Encoder; 4c1. Moving part; 4c2. Stationary part; 4d. Stator core; 5. Static pressure ring; 5a. Upper flow channel; 5b. Lower flow channel; 6. Bearing; 6a. Outer ring; 6b. Inner ring; 7. Upper oil groove; 8. Oil cavity; 9. Annular oil groove; 10. Connecting ring; 10a. Lower step; 11. Center shaft; 12. Connecting piece; 13. Sealing cover; 13a. Threaded hole; 14. Sealing ring. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] Example 1: As Figure 1 and Figure 2 As shown, the novel hydrostatic rotary table includes a worktable 1, a support cylinder 2 vertically fixed to the bottom of the worktable 1, and a cylindrical base 3 sleeved on the support cylinder 2, and the support cylinder 2, the worktable 1 and the base 3 are coaxially arranged.

[0023] Specifically A motor 4 and a static pressure ring 5 are vertically mounted inside the base 3, and both the motor 4 and the static pressure ring 5 are vertically positioned. The type of motor 4 is a direct drive motor. The motor 4 includes a rotor shaft 4a, a barrel 4b, an encoder 4c, and a stator core 4d. The barrel 4b is fixed on the base 3, the stator core 4d is fixed on the barrel 4b, and the upper end of the rotor shaft 4a is fixed to the worktable 1.

[0024] A static pressure ring 5 is fitted and fixed on the barrel 4b, and a rubber ring forms a seal between the inner wall of the static pressure ring 5 and the outer wall of the barrel 4b. The static pressure ring 5 is located inside the support cylinder 2, and an oil passage is formed between the support cylinder 2, the base 3, and the static pressure ring 5. Under the action of the oil passage, an axial supporting oil film is formed between the support cylinder 2 and the base 3, and a radial supporting oil film is formed between the static pressure ring 5 and the support cylinder 2. A bearing 6 is provided between the upper end of the barrel 4b and the rotor shaft 4a. The bearing 6 is a ball bearing 6, which includes an outer ring 6a fixed to the barrel 4b and an inner ring 6b fixed to the rotor shaft 4a, with the lower end of the outer ring 6a pressing against the stator core 4d. Preferably, both the outer ring 6a and the inner ring 6b are fixed to the barrel 4b and the rotor shaft 4a respectively by an interference fit. Further, the outer wall of the rotor shaft 4a has an annular shoulder surface, and the lower end of the inner ring 6b presses against the shoulder surface to better support the bearing 6 upward.

[0025] A bearing 6 is added between the upper end of the barrel 4b and the rotor shaft 4a, and the lower end of the outer ring 6a of the bearing 6 presses against the stator core 4d, so that the worktable 1 always has an upward support force, effectively preventing the support cylinder 2 and the base 3 from seizing due to uneven oil film, thereby improving the life and working stability of the hydrostatic turntable.

[0026] In this embodiment, like Figure 1 and Figure 2As shown, the oil passage structure is existing technology, and specifically as follows: The upper end of the base 3 is sealed to the worktable 1 through an oil seal. An oil inlet hole 3a is provided on the middle side wall of the base 3, and one of the ports of the oil inlet hole 3a is located on the outer side surface of the base 3, and this port is the inlet of the oil passage. An annular mounting groove coaxial with the support cylinder 2 is provided on the outer side wall of the support cylinder 2. A convex ring 3b is provided on the middle inner wall of the base 3, and the convex ring 3b is located in the mounting groove. An annular upper oil groove 7 is formed between the top surface of the convex ring 3b and the inner wall of the mounting groove. An annular oil passage gap 1 is also provided between the convex ring 3b and the inner wall of the mounting groove, which connects the oil inlet hole 3a to the upper oil groove 7. The upper end of the barrel 4b is sealed to the worktable 1 through an oil seal. At this time, the support cylinder 2, the static pressure ring 5, the barrel 4b and the worktable 1 form an oil cavity 8. An oil drain hole 3c is provided on the side wall of the oil cavity 8, and the oil drain hole 3c is the outlet of the oil passage. At least one annular oil groove 9 is formed between the static pressure ring 5 and the support cylinder 2, and the annular oil groove 9 and the support cylinder 2 are coaxially arranged. An upper flow channel 5a and a lower flow channel 5b are vertically formed inside the static pressure ring 5. An oil passage gap 2 connecting the oil inlet hole 3a exists between the support cylinder 2 and the base 3. The lower end of the lower flow channel 5b is connected to the oil passage gap 2, the middle part of the lower flow channel 5b is connected to the annular oil groove 9, and the upper end of the lower flow channel 5b is closed. The upper end of the upper flow channel 5a is connected to the oil cavity 8, the middle part of the upper flow channel 5a is connected to the annular oil groove 9, and the lower end of the upper flow channel 5a is closed.

[0027] During use, hydraulic oil enters through the inlet hole 3a, and part of the hydraulic oil enters the upper oil groove 7 through the first oil passage gap to form an axial support oil film between the support cylinder 2 and the base 3. The other part of the hydraulic oil enters the lower flow channel 5b through the second oil passage gap and flows into the annular oil groove 9 to form a radial support oil film between the static pressure ring 5 and the support cylinder 2. Finally, the hydraulic oil is discharged into the oil chamber 8 through the upper flow channel 5a and discharged through the drain hole 3c to achieve circulation.

[0028] The rotor shaft 4a and the worktable 1 are connected as follows: the rotor shaft 4a and the worktable 1 are fixedly connected by a connecting ring 10, and the connecting ring 10 is coaxially arranged with the rotor shaft 4a. The bottom wall of the worktable 1 presses against the outer wall of the connecting ring 10, and the top wall of the rotor shaft 4a presses against the bottom of the connecting ring 10. This design provides more stable upward support for the worktable 1, thus more reliably achieving the goal of improving the lifespan and operational stability of the hydrostatic turntable.

[0029] To further explain, such as Figure 2 and Figure 3As shown, the worktable 1 has a vertically penetrating central hole 1a, and the central hole 1a is coaxially arranged with the worktable 1. An annular upper step is formed on the outer wall of the connecting ring 10. The upper end of the connecting ring 10 is inserted into the central hole 1a, and the edge of the central hole 1a presses against the bottom wall of the upper step. An annular lower step 10a is formed on the bottom wall of the connecting ring 10, matching the upper end of the rotor shaft 4a. The upper end of the rotor shaft 4a is inserted into the lower step 10a and pressed against the bottom wall of the lower step 10a. The bottom wall of the connecting ring 10 presses against the top wall of the inner ring 6b. The connecting ring 10 serves both to connect the rotor shaft 4a and the worktable 1, and also cooperates with the stator core 4d in the axial upper limit bearing 6. Therefore, in this application, the connecting ring 10 has a dual function, simplifying the structure and facilitating assembly.

[0030] like Figure 3 As shown, encoder 4c is an existing product, generally composed of a moving part 4c1 (such as an encoder disk) and a stationary part 4c2 (such as a sensor). Encoder 4c is located in the central hole 1a. The rotor shaft 4a is hollow, and a central shaft 11 is coaxially mounted inside the rotor shaft 4a. The lower end of the central shaft 11 is fixed to the barrel 4b via a connector 12. The moving part 4c1 is fixed to the connecting ring 10, and the stationary part 4c2 is fixed to the central shaft 11. A sealing element for sealing the opening of the central hole 1a is fixed on the worktable 1. By placing the encoder 4c in the central hole 1a of the worktable 1, the encoder 4c is positioned on top, facilitating maintenance.

[0031] in, The sealing element includes a sealing cap 13, which is detachably fixed inside the upper end of the central hole 1a. A seal is formed between the outer wall of the sealing cap 13 and the wall of the central hole 1a, offering advantages such as simple structure and convenient installation. Preferably, the shape and size of the outer wall of the sealing cap 13 match the upper end of the central hole 1a, and the sealing cap 13 is snapped into the central hole 1a, thus installation is achieved by pressing the sealing cap 13 in. A threaded hole 13a is vertically formed at the top of the sealing cap 13, and the threaded hole 13a is a blind hole. During use, a tool is screwed into the threaded hole 13a, allowing the sealing cap 13 to be easily pulled out, facilitating disassembly and assembly and enabling maintenance.

[0032] An annular groove is provided on the outer side wall of the sealing cover 13, and a sealing ring 14 is provided in the annular groove. The outer side wall of the sealing ring 14 contacts and seals with the inner wall of the central hole 1a to enhance the sealing performance between the sealing cover 13 and the central hole 1a.

[0033] The connector 12 is a horizontally arranged connecting plate, and the lower end of the central shaft 11 and the lower end of the barrel 4b are both fixed to the connecting plate.

[0034] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1. The difference is that the sealing cap 13 is threadedly connected to the center hole 1a.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A novel hydrostatic rotary table, comprising a worktable (1), a support cylinder (2) vertically fixed to the bottom of the worktable (1), and a cylindrical base (3) sleeved outside the support cylinder (2). A motor (4) and a hydrostatic ring (5) are vertically arranged inside the base (3). The motor (4) includes a rotor shaft (4a), a barrel (4b), and a stator core (4d). The upper end of the rotor shaft (4a) is fixedly connected to the worktable (1). An oil passage is formed between the support cylinder (2), the base (3), and the hydrostatic ring (5). Under the action of the oil passage, an axial supporting oil film is formed between the support cylinder (2) and the base (3), and a radial supporting oil film is formed between the hydrostatic ring (5) and the support cylinder (2). The table is characterized in that... The barrel (4b) is fixed on the base (3), and the static pressure ring (5) is sleeved and fixed on the barrel (4b); a bearing (6) is provided between the upper end of the barrel (4b) and the rotor shaft (4a). The bearing (6) includes an outer ring (6a) fixed to the barrel (4b) and an inner ring (6b) fixed to the rotor shaft (4a), and the lower end of the outer ring (6a) presses against the stator core (4d).

2. The novel hydrostatic rotary table according to claim 1, characterized in that, The rotor shaft (4a) and the worktable (1) are fixedly connected by a connecting ring (10), and the connecting ring (10) and the rotor shaft (4a) are coaxially arranged. The bottom wall of the worktable (1) presses against the outer wall of the connecting ring (10), and the top wall of the rotor shaft (4a) presses against the bottom of the connecting ring (10).

3. The novel hydrostatic rotary table according to claim 2, characterized in that, The bottom wall of the connecting ring (10) has a ring-shaped lower step (10a) that matches the upper end of the rotor shaft (4a). The upper end of the rotor shaft (4a) is inserted into the lower step (10a) and pressed against the bottom wall of the lower step (10a). The bottom wall of the connecting ring (10) presses against the top wall of the inner ring (6b).

4. The novel hydrostatic rotary table according to claim 1, characterized in that, The motor (4) also includes an encoder (4c). The worktable (1) has a vertically penetrating central hole (1a), and the encoder (4c) is located in the central hole (1a). The rotor shaft (4a) is hollow, and a central shaft (11) is coaxially arranged inside the rotor shaft (4a). The lower end of the central shaft (11) is fixed to the barrel (4b) through a connector (12). The encoder (4c) is divided into a moving part (4c1) fixed to the rotor shaft (4a) and a stationary part (4c2) fixed to the central shaft (11). A sealing element for sealing the opening of the central hole (1a) is fixed on the worktable (1).

5. The novel hydrostatic rotary table according to claim 4, characterized in that, The sealing element includes a sealing cap (13), which is detachably fixed inside the upper end of the central hole (1a), and a seal is formed between the outer wall of the sealing cap (13) and the wall of the central hole (1a).

6. The novel hydrostatic rotary table according to claim 5, characterized in that, The shape and size of the outer wall of the sealing cap (13) are matched with the upper end of the central hole (1a), and the sealing cap (13) is locked in the central hole (1a).

7. The novel hydrostatic rotary table according to claim 6, characterized in that, The top of the sealing cap (13) has a vertically opened threaded hole (13a), and the type of threaded hole (13a) is a blind hole.

8. The novel hydrostatic rotary table according to claim 5, characterized in that, An annular groove is provided on the outer wall of the sealing cover (13), and a sealing ring (14) is provided in the annular groove. The outer wall of the sealing ring (14) is in contact with the inner wall of the central hole (1a) for sealing.

9. The novel hydrostatic rotary table according to claim 4, characterized in that, The connector (12) is a horizontally set connecting plate, and the lower end of the central shaft (11) and the lower end of the barrel (4b) are both fixed on the connecting plate.

Images