Hydrostatic pressure high-precision main shaft

Abstract

The hydrostatic pressure high-precision main shaft comprises a rotating shaft, a shaft seat and a sealing assembly, the rotating shaft is rotationally connected with the shaft seat, the rotating shaft is used for driving other equipment to work, the shaft seat is used for containing the rotating shaft, the shaft seat comprises a medium passing hole and a guide groove, and the medium passing hole allows a medium to enter the guide groove; a medium containing cavity is formed between the guide groove and the rotating shaft, the guide groove is used for guiding media to be distributed in the medium containing cavity, the medium containing cavity is used for enabling the media to be distributed between the rotating shaft and the shaft base, and the sealing assembly is used for blocking the two ends of the medium containing cavity. The hydraulic static pressure spindle has the advantages that the rotating speed of the static pressure spindle is increased to be suitable for grinding small and medium holes, the structure is simple, the machining difficulty is low, and high precision and stability of the hydraulic static pressure spindle are achieved.

Description

Technical Field

[0001] This application relates to the technical field of machine tool equipment, and particularly relates to a hydrostatic high-precision spindle. Background Art

[0002] With the development of the manufacturing industry, the requirements for manufacturing precision are getting higher and higher. Hydrostatic spindles are increasingly applied to machine tools. However, at present, general hydrostatic spindles need to be provided with structures such as radial hydrostatic bearings, which makes the structure of the hydrostatic spindle complex, the cost high, and the rotational speed slow, and it is not very suitable for small and medium hole grinding. Utility Model Content

[0003] Aiming at the deficiencies of the prior art, one of the purposes of this application is to provide a hydrostatic high-precision spindle, which has the advantages of increasing the rotational speed of the hydrostatic spindle to be suitable for small and medium hole grinding, and having a simple structure, low processing difficulty, and achieving high precision and stability of the hydrostatic spindle.

[0004] The above object of this application is achieved through the following technical solutions:

[0005] A hydrostatic high-precision spindle includes a rotating shaft, a shaft seat, and a sealing component. The rotating shaft is rotatably connected to the shaft seat. The rotating shaft is used to drive other equipment to work, and the shaft seat is used to accommodate the rotating shaft. The shaft seat includes a medium through hole and a guiding groove. The medium through hole supplies the medium into the guiding groove. A medium accommodating cavity is formed between the guiding groove and the rotating shaft. The guiding groove is used to guide the medium to be distributed in the medium accommodating cavity. The medium accommodating cavity is used to make the medium distributed between the rotating shaft and the shaft seat. The sealing component is used to seal both ends of the medium accommodating cavity.

[0006] By adopting the above technical solutions, the medium accommodating cavity enables the high-pressure medium to contact the rotating shaft evenly, so that the high-pressure medium forms a high-pressure film layer, realizing the suspended rotation of the rotating shaft, thereby increasing the rotational speed of the rotating shaft to be suitable for small and medium hole grinding. Using the rotating shaft, the shaft seat, and the sealing component enables the medium accommodating cavity to form a chamber that meets the requirements, thus achieving high precision and stability of the hydrostatic spindle with a simple structure and low cost.

[0007] In a preferred example of this application, it can be further configured as follows: The shaft seat is provided with a receiving hole for receiving the rotating shaft. The guiding groove is provided on the receiving hole, and the guiding groove is formed by a plurality of annular grooves and axial grooves communicating with each other.

[0008] By adopting the above technical solutions, the guiding groove is provided on the receiving hole, which makes the processing difficulty of the guiding groove low and the precision easy to control, so that the medium distributed in the medium accommodating cavity formed by the guiding groove and the rotating shaft is more uniform. Using the rotating shaft to drive other equipment to work can cooperate with small and medium hole grinding.

[0009] In a preferred embodiment, the present application can be further configured as follows: it further includes a support seat, the support seat includes a medium inlet and a mating hole, the medium inlet is communicated with the medium through-hole, the shaft seat is installed on the support seat, and the mating hole is used for tightly mating with the shaft seat.

[0010] By adopting the above technical solution, the mating hole and the shaft seat are tightly mated, so that the support seat and the shaft seat are tightly mated, thereby enabling the support seat and the shaft seat to be fixedly connected.

[0011] In a preferred embodiment, the present application can be further configured as follows: a communication groove is provided on the shaft seat, and the medium inlet and the medium through-hole are communicated through the communication groove.

[0012] By adopting the above technical solution, the communication groove enables the medium inlet and the medium through-hole to be quickly communicated.

[0013] In a preferred embodiment, the present application can be further configured as follows: the sealing assembly includes a sealing cover plate and a cover plate one, the sealing cover plate is used to seal one end of the medium containing cavity, and the sealing cover plate and the cover plate one cooperate to define the axial position of the rotating shaft.

[0014] By adopting the above technical solution, the sealing cover plate and the cover plate one cooperate to define the axial position of the rotating shaft, so that the rotating shaft is not easily deflected.

[0015] In a preferred embodiment, the present application can be further configured as follows: a first groove and a first limiting surface are provided on the sealing cover plate, a second groove, a first mating surface and a second mating surface are provided on the rotating shaft, the first groove and the second groove are communicated with the medium containing cavity for containing the medium and are arranged opposite to each other, the first limiting surface and the first mating surface cooperate to prevent the rotating shaft from axially moving away from the other device side, and a second limiting surface is provided on the cover plate one, and the second limiting surface and the second mating surface cooperate to prevent the rotating shaft from axially moving towards the other device side.

[0016] By adopting the above technical solution, the first groove and the second groove contain the medium and are arranged opposite to each other, so that the medium is more fully distributed between the sealing cover plate and the rotating shaft, thereby reducing the friction force between the sealing cover plate and the rotating shaft, enabling the rotating shaft to float at the sealing assembly end, the first limiting surface and the first mating surface cooperate to prevent the rotating shaft from axially moving away from the other device side, and the second limiting surface and the second mating surface cooperate to prevent the rotating shaft from axially moving towards the other device side, thereby limiting the axial displacement of the rotating shaft.

[0017] In a preferred embodiment, the present application can be further configured as follows: the sealing cover plate is provided with a third groove, and the cover plate one is provided with a protrusion, and the third groove and the protrusion cooperate to seal the gap between the sealing cover plate and the cover plate one.

[0018] By adopting the above technical solution, it prevents the medium from leaking between the sealing cover plate and the cover plate one.

[0019] In a preferred example, the present application can be further configured such that: Cover Plate 1 is provided with Recess 4, and Recess 4 is used to accommodate the seal.

[0020] By adopting the above technical solution, the sealing effect of the medium accommodation cavity is better.

[0021] In a preferred example, the present application can be further configured such that: The sealing assembly further includes Cover Plate 2, and Cover Plate 2 is used to seal the other end of the medium accommodation cavity.

[0022] By adopting the above technical solution, the sealing condition of the medium accommodation cavity meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of an embodiment of the present application.

[0024] Figure 2 is a schematic structural diagram of another perspective of an embodiment of the present application.

[0025] Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present application.

[0026] Figure 4 is a schematic structural diagram of the shaft seat of the present application.

[0027] Reference Signs: 1, support; 11, medium inlet; 12, connection hole; 2, rotating shaft; 21, Recess 2; 22, mating surface 1; 23, mating surface 2; 24, keyway; 25, threaded hole; 3, shaft seat; 31, through hole; 32, communication groove; 33, guide groove; 34, annular groove; 35, axial groove; 4, sealing cover plate; 41, Recess 1; 42, limiting surface 1; 43, limiting surface 2; 44, Recess 3; 45, protrusion; 46, sealing groove; 47, Recess 4; 5, Cover Plate 1; 6, Cover Plate 2; 7, medium accommodation cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present application in detail with reference to the accompanying drawings.

[0029] Refer to Figures 1 to 4 , a liquid hydrostatic high-precision spindle disclosed in the present application, includes a support 1, a rotating shaft 2, a shaft seat 3, and a sealing assembly. The shaft seat 3 is installed on the support 1, the rotating shaft 2 and the shaft seat 3 are rotatably connected, the rotating shaft 2 is used to drive other devices to work, and the shaft seat 3 is used to accommodate the rotating shaft 2.

[0030] The shaft seat 3 includes a medium through-hole 31, a communication groove 32, a guiding groove 33 and a receiving hole. The receiving hole is used to receive the rotating shaft 2. The guiding groove 33 is provided with a number of annular grooves 34 and axial grooves 35 penetrating through the receiving hole. In this embodiment, the number of the medium through-holes 31 is set to four groups. Four axial grooves 35 are evenly distributed axially in the guiding groove 33. The medium through-hole 31 supplies the medium into the guiding groove 33. A medium receiving cavity 7 is formed between the guiding groove 33 and the rotating shaft 2. The guiding groove 33 is used to guide the medium to be distributed in the medium receiving cavity 7. The medium receiving cavity 7 is used to make the medium be distributed between the rotating shaft 2 and the shaft seat 3. The sealing assembly is used to block both ends of the medium receiving cavity 7. In this embodiment, the medium can be lubricating oil.

[0031] The support 1 includes a medium inlet 11 and a mating hole. The medium inlet 11 is connected to the medium through-hole 31 through the communication groove 32. The medium inlet 11 is connected to the medium through-hole 31. The mating hole is used to closely cooperate with the shaft seat 3. The support 1 further includes a connection hole 12. The support 1 is installed at the required position through the connection hole 12.

[0032] The sealing assembly includes a sealing cover plate 4, a cover plate one 5 and a cover plate two 6. The sealing cover plate 4 and the cover plate two 6 are installed on the rotating shaft 2 and the support 1. The cover plate one 5 is installed on the sealing cover plate 4. The sealing cover plate 4 is used to block one end of the medium receiving cavity 7. The sealing cover plate 4 and the cover plate one 5 cooperate to limit the axial position of the rotating shaft 2. The cover plate two 6 is used to block the other end of the medium receiving cavity 7. A sealing bearing is provided in the cover plate two 6 to seal the gap between the rotating shaft 2 and the cover plate two 6.

[0033] The sealing cover plate 4 is provided with a groove one 41, a limiting surface one 42 and a sealing groove 46. The sealing groove 46 is used to seal the gap between the sealing cover plate 4 and the support 1. The rotating shaft 2 is provided with a groove two 21, a mating surface one 22 and a mating surface two 23. The groove one 41 and the groove two 21 are connected to the medium receiving cavity 7 for receiving the medium and are arranged opposite to each other. The limiting surface one 42 and the mating surface one 22 cooperate to prevent the rotating shaft 2 from axially moving away from the other equipment. The cover plate one 5 is provided with a limiting surface two 43. The limiting surface two 43 and the mating surface two 23 cooperate to prevent the rotating shaft 2 from axially moving towards the other equipment. The sealing cover plate 4 is provided with a groove three 44. The cover plate one 5 is provided with a protrusion 45. The groove three 44 and the protrusion 45 cooperate to seal the gap between the sealing cover plate 4 and the cover plate one 5. The cover plate one 5 is provided with a groove four 47. The groove four 47 is used to receive the sealing element. In this embodiment, the sealing element can be a rotary seal ring.

[0034] A key groove 24 is provided at one end of the rotating shaft 2. The key groove 24 is used to connect with the driving part of the rotating shaft 2. A threaded hole 25 is provided at the other end for connecting with other equipment.

[0035] During installation, the support 1 is installed at the required position through the connection hole 12. One end of the rotating shaft 2 is connected to the power source through the keyway 24, and the other end of the rotating shaft 2 is connected to other equipment through the threaded hole 25.

[0036] During operation, the medium enters the medium through-hole 31 on the shaft seat 3 from the medium inlet 11, and then enters the communication groove 32 from the medium through-hole 31, so that the medium enters the guide groove 33 from the communication groove 32, and further the medium enters the medium accommodation cavity 7. After the medium accommodation cavity 7 is filled with the medium, the medium enters the first groove 41 and the second groove 21 from the medium accommodation cavity 7, so that the first groove 41 and the second groove 21 are filled with the medium, enabling the rotating shaft 2 to float, and thus increasing the rotation speed of the rotating shaft 2.

[0037] The implementation principle of this embodiment is as follows: The rotating shaft 2 and the shaft seat 3 form the medium accommodation cavity 7, allowing the medium to flow from the medium inlet 11 to the medium accommodation cavity 7. The medium accommodation cavity 7 enables the high-pressure medium to contact the rotating shaft 2 evenly, so that the high-pressure medium forms a high-pressure film layer, realizing the floating rotation of the rotating shaft 2, thereby increasing the rotation speed of the rotating shaft 2 to be applicable to small and medium-sized hole grinding. The rotating shaft 2, the shaft seat 3 and the sealing assembly are used to make the medium accommodation cavity 7 form a chamber that meets the requirements. The first groove 41 and the second groove 21 of the sealing assembly are communicated with the medium accommodation cavity 7, so that the first groove 41 and the second groove 21 are filled with the medium, enabling the rotating shaft 2 at the sealing assembly end to float, and thus making the floating effect of the rotating shaft 2 better.

[0038] The embodiments of this specific implementation manner are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. A hydrostatic high-precision spindle, characterized in that: It includes a rotating shaft (2), a shaft seat (3) and a sealing assembly. The rotating shaft (2) is rotatably connected to the shaft seat (3). The rotating shaft (2) is used to drive other devices to work, and the shaft seat (3) is used to accommodate the rotating shaft (2). The shaft seat (3) includes a medium through hole (31) and a guiding groove (33). The medium through hole (31) allows the medium to enter the guiding groove (33). A medium accommodating cavity (7) is formed between the guiding groove (33) and the rotating shaft (2). The guiding groove (33) is used to guide the medium to be distributed in the medium accommodating cavity (7). The medium accommodating cavity (7) is used to make the medium distributed between the rotating shaft (2) and the shaft seat (3). The sealing assembly is used to seal both ends of the medium accommodating cavity (7).

2. The hydrostatic high-precision spindle according to claim 1, wherein: The shaft seat (3) is provided with a receiving hole for accommodating the rotating shaft (2). The guiding groove (33) is provided on the receiving hole. The guiding groove (33) is formed by a plurality of annular grooves (34) and axial grooves (35) penetrating each other.

3. The hydrostatic high-precision spindle according to claim 1, wherein: It further includes a support (1). The support (1) includes a medium inlet (11) and a mating hole. The medium inlet (11) is communicated with the medium through hole (31). The shaft seat (3) is installed on the support (1), and the mating hole is used for close fitting with the shaft seat (3).

4. The hydrostatic high-precision spindle according to claim 3, characterized in that: The shaft seat (3) is provided with a communicating groove (32). The medium inlet (11) and the medium through hole (31) are communicated through the communicating groove (32).

5. The hydrostatic high-precision spindle according to claim 1, characterized in that: The sealing assembly includes a sealing cover plate (4) and a cover plate one (5). The sealing cover plate (4) is used to seal one end of the medium accommodating cavity (7). The sealing cover plate (4) and the cover plate one (5) cooperate to define the axial position of the rotating shaft (2).

6. The hydrostatic high-precision spindle according to claim 5, wherein: The sealing cover plate (4) is provided with a groove one (41) and a limiting surface one (42). The rotating shaft (2) is provided with a groove two (21), a mating surface one (22) and a mating surface two (23). The groove one (41) and the groove two (21) are communicated with the medium accommodating cavity (7) for accommodating the medium and are arranged opposite to each other. The limiting surface one (42) and the mating surface one (22) cooperate to prevent the rotating shaft (2) from axially moving away from the other device. The cover plate one (5) is provided with a limiting surface two (43). The limiting surface two (43) and the mating surface two (23) cooperate to prevent the rotating shaft (2) from axially moving towards the other device.

7. A hydrostatic high-precision spindle according to claim 6, characterized in that: The sealing cover plate (4) is provided with a groove three (44), and the cover plate one (5) is provided with a protrusion (45). The groove three (44) and the protrusion (45) cooperate to seal the gap between the sealing cover plate (4) and the cover plate one (5).

8. A hydrostatic high-precision spindle according to claim 7, characterized in that: The cover plate one (5) is provided with a groove four (47), and the groove four (47) is used for a seal.

9. A hydrostatic high-precision spindle according to claim 6, characterized in that: The bottom surface of the groove two (21) is an inclined surface, and the inclined surface is used to guide the medium to flow to other parts of the rotating shaft (2).

10. A hydrostatic high-precision spindle according to claim 6, characterized in that: The sealing assembly further includes a cover plate two (6), and the cover plate two (6) is used to seal the other end of the medium accommodating cavity (7).

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