Air floating rotary table

Abstract

The utility model relates to an air floatation rotary table, which comprises a bottom plate, a motor, a transition ring, a bearing, a rotating shaft and a table top, a bearing ring is arranged on the outer side of the bearing, the first end of the bearing ring is connected with the table top, a thrust plate is arranged at the second end of the bearing ring, the bearing ring, the thrust plate and the table top rotate along with the rotating shaft, and an air supply channel is arranged in the transition ring. An air supply port is formed in the surface of the transition ring, a plurality of air outlet holes are formed in the surface of the bearing, longitudinal air channels, transverse air channels and an air cavity are formed in the bearing, the air outlet holes are at least communicated with one longitudinal air channel or one transverse air channel, and part of the longitudinal air channels and part of the transverse air channels form a first channel and are communicated with an air supply channel. Parts of the longitudinal air channels and parts of the transverse air channels form second channels, and the first channels and the second channels are communicated with the air cavity. The bearing splicing technology is innovatively adopted, the problem that punching of a large-size bearing is limited in the past is solved, the air floatation area and the overall supporting rigidity are increased, and a guarantee is provided for achieving high rotating speed.

Description

TECHNICAL FIELD

[0001] The utility model relates to air floatation device technical field especially relates to a kind of air floatation rotary table. BACKGROUND

[0002] Motor rotary table is a kind of numerical control equipment driven by rotary motor, and the motor rotor of rotary motor drives the rotation of the table surface through the core shaft, so that the table surface can be rotated to any position and fixed in the position. The existing motor rotary table is usually provided with rolling bearing on the core shaft to reduce the end face runout and radial runout amplitude of the table surface, so that the table surface has high rotation accuracy. However, the wear and physical contact of the rolling bearing during use will affect the accuracy of the motor rotary table.

[0003] Some existing motor rotary tables also use air floatation bearings. However, the assembly structure of such motor rotary tables is relatively complex, which is not conducive to production assembly and later maintenance. Although the existing air floatation rotary table can realize rotary motion, it also forms a uniform air film between the rotating part and the stationary part of the rotary table to separate them, thereby realizing frictionless motion. However, the existing rotary table cannot meet the requirements of high-speed high-precision rotary motion under the requirement of large-size table surface.

[0004] Therefore, there is a need for an air floatation rotary table that can realize high-speed rotation under large size and meet the market demand for high-precision high-speed rotation. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the utility model provides an air floatation rotary table.

[0006] The technical scheme of the utility model is as follows:

[0007] An air floatation rotary table includes a bottom plate, a motor arranged on the bottom plate, a transition ring arranged on the motor, a bearing arranged on the transition ring, a rotating shaft driven by the motor, and a table surface arranged on the end of the rotating shaft away from the motor. The transition ring and the bearing are both sleeved on the rotating shaft. The outer side of the bearing is provided with a bearing ring. The first end of the bearing ring is connected with the table surface. The second end of the bearing ring is provided with a thrust plate. The bearing ring, the thrust plate, and the table surface all rotate with the rotating shaft. The transition ring is provided with a gas supply channel. The surface of the transition ring is provided with a gas supply port in communication with the gas supply channel. The surface of the bearing is provided with a plurality of gas outlets. The bearing is internally provided with a plurality of longitudinal air passages, a plurality of transverse air passages, and a gas cavity. The gas outlets are in communication with at least one longitudinal air passage or one transverse air passage. Part of the longitudinal air passages and part of the transverse air passages form a first channel in communication with the gas supply channel. Part of the longitudinal air passages and part of the transverse air passages form a second channel. The first channel and the second channel are both in communication with the gas cavity.

[0008] As a further improvement of the utility model, the first air outlet hole in communication with the first channel forms a first concentric circle group around the bearing center, the first air outlet hole in communication with the second channel forms a second concentric circle group around the bearing center, and the first concentric circle group and the second concentric circle group are staggered.

[0009] As a further improvement of the utility model, the first air outlet hole in communication with the first channel forms a first concentric circle group around the bearing center, the first air outlet hole in communication with the second channel forms a second concentric circle group around the bearing center, and the first concentric circle group and the second concentric circle group are staggered.

[0010] As a further improvement of the utility model, the first air outlet hole in communication with the first channel forms a first concentric circle group around the bearing center, the first air outlet hole in communication with the second channel forms a second concentric circle group around the bearing center, and the first concentric circle group and the second concentric circle group are staggered.

[0011] As a further improvement of the utility model, the bearing comprises a first bearing and a second bearing connected, the first bearing is close to the table top, the second bearing is connected with the transition ring, the air cavity is an annular groove, and the air cavity is arranged on the surface of the first bearing close to the second bearing or the surface of the second bearing close to the first bearing.

[0012] As a further improvement of the utility model, the first bearing and / or the second bearing are provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

[0013] As a further improvement of the utility model, the transition ring comprises a first connecting part connected with the motor, a second connecting part connected with the bearing, and a third connecting part connecting the first connecting part and the second connecting part, the air supply port is arranged on the first connecting part, the first end of the air supply channel is arranged on the first connecting part, the second end of the air supply channel is arranged on the second connecting part, the first connecting part and the second connecting part are both cylindrical bodies, and the inner diameter of the first connecting part is greater than the inner diameter of the second connecting part.

[0014] As a further improvement of the utility model, the height of the second connecting part is at least twice the height of the third connecting part.

[0015] As a further improvement of the utility model, the outer side of the first connecting part is provided with a heat dissipation groove.

[0016] As a further improvement of the utility model, the side of the thrust plate away from the bearing is provided with a grating, and a reading head is arranged on the transition ring.

[0017] According to the utility model of the above solution, the beneficial effects of the utility model are:

[0018] 1. The bearing adopts innovative splicing technology. By adding an air cavity to the bearing and adopting a unique groove ventilation method, the gas is discharged through the first channel and the second channel to form a stable air film. This breaks the problem of limited drilling in large-sized bearings in the past, increases the air flotation area and overall support rigidity, and provides a guarantee for the realization of high speed;

[0019] 2. The transition ring adopts an innovative new structure, which increases the distance between the motor and the bearing, reducing the impact of motor heating on the bearing;

[0020] 3. The innovative connection between the grating and the bearing ring breaks away from the previous method of connecting the grating to the rotating shaft, solves the installation problem of large-size and high-precision gratings, facilitates subsequent maintenance and adjustment, and also provides high-precision position feedback for the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 It is a structural sectional view of the utility model;

[0023] Figure 3 This is a schematic structural diagram of the first bearing at a first angle of the present invention;

[0024] Figure 4 This is a schematic structural diagram of the second angle of the first bearing of the utility model;

[0025] Figure 5 This is a schematic structural diagram of the second bearing at a first angle of the present invention;

[0026] Figure 6 This is a schematic structural diagram of the second bearing at the second angle of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the transition ring of the utility model.

[0028] In the figure: 1. Base plate; 2. Motor; 3. Transition ring; 31. Air supply port; 32. First connecting part; 33. Second connecting part; 34. Third connecting part; 35. Heat dissipation groove; 36. Reading head; 4. Rotating axis; 5. Table; 6. Bearing ring; 7. Thrust plate; 81. Longitudinal air duct; 82. Transverse air duct; 83. Air cavity; 84. First air outlet; 85. Second air outlet; 86. First bearing; 87. Second bearing; 88. Sealing groove; 9. Grating. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] See also Figure 1 and Figure 2The utility model provides an air-floating turntable, comprising a base plate 1, a motor 2 arranged on the base plate 1, a transition ring 3 arranged on the motor 2, a bearing arranged on the transition ring 3, a rotating shaft 4 driven by the motor 2, and a table 5 arranged at one end of the rotating shaft 4 away from the motor 2. The transition ring 3 realizes the upper and lower separation of the motor 2 and the bearing, increases the installation space of the motor 2, and can also avoid the influence of the heat of the motor 2 on the bearing. The transition ring 3 and the bearing are both sleeved on the rotating shaft 4, and a bearing ring 6 is provided on the outer side of the bearing. The first end of the bearing ring 6 is connected to the table 5, and the second end of the bearing ring 6 is provided with a thrust plate 7. The bearing ring 6, the thrust plate 7, and the table 5 all rotate with the rotating shaft 4, that is, the base plate 1, the motor 2, the transition ring 3 and the bearing constitute a stationary component, and the rotating shaft 4 , a table 5, a bearing ring 6 and a thrust plate 7 form a rotating assembly, an air supply channel is provided in the transition ring 3, and an air supply port 31 connected to the air supply channel is provided on the surface of the transition ring 3, a plurality of air outlet holes are provided on the surface of the bearing, and a plurality of longitudinal air channels 81, a plurality of transverse air channels 82 and an air cavity 83 are provided inside the bearing, and the air outlet holes are connected to at least one longitudinal air channel 81 or one transverse air channel 82, that is, a part of the air outlet holes are connected to the longitudinal air channel 81, and the other part of the air outlet holes are connected to the transverse air channel 82. Preferably, the air outlet holes and the air channels are connected one by one, part of the longitudinal air channels 81 and part of the transverse air channels 82 form a first channel and are connected to the air supply channel, part of the longitudinal air channels 81 and part of the transverse air channels 82 form a second channel, and both the first channel and the second channel are connected to the air cavity 83.

[0033] During operation, an external air source supplies air to the air supply channel through the air supply port 31. The first channel supplies air through the air supply channel. Part of the gas in the first channel is discharged through the air outlet and forms an air film between the table 5, the bearing ring 6 and the thrust plate 7. The other part of the gas flows into the air cavity 83. The second channel supplies air through the air cavity 83. All the gas in the second channel is discharged through the air outlet and forms an air film between the table 5, the bearing ring 6 and the thrust plate 7. Then, the motor 2 is powered to drive the rotating shaft 4 to rotate, thereby driving the table 5, the bearing ring 6 and the thrust plate 7 to rotate together.

[0034] The utility model adds an air cavity 83 to the bearing and adopts a unique groove ventilation method. The gas is discharged through the first channel and the second channel, so that a stable air film is formed between the bearing and the table 5, the bearing ring 6 and the thrust plate 7. The bearing is constrained from the outside, thereby adjusting the posture of the rotating shaft 4, the table 5, the bearing ring 6 and the thrust plate 7. This breaks the problem of limited drilling of large-sized bearings in the past, increases the air flotation area and the overall support rigidity, and provides a guarantee for the realization of high speed.

[0035] As an embodiment of the present invention, the air outlet includes a first air outlet 84 arranged on the end face of the bearing and a second air outlet 85 arranged on the side face of the bearing. The first air outlet 84 is connected to the longitudinal air duct 81, and the second air outlet 85 is connected to the transverse air duct 82. That is, the gas discharged from the first air outlet 84 forms an air film between the bearing and the table 5 or the thrust plate 7, and the gas discharged from the second air outlet 85 forms an air film between the bearing and the bearing ring 6 or the rotating shaft 4. The bearing discharges a certain amount of gas in all directions, thereby forming an air film between the bearing and the surrounding components. The positions of the bearing, the rotating shaft 4, the table 5, the bearing ring 6, and the thrust plate 7 are positioned by the air film, thereby effectively improving the stability of the rotating assembly during rotation, ensuring the realization of the high speed and high precision requirements of the air floating turntable, and improving the overall reliability of the air floating turntable.

[0036] As an embodiment of the present invention, the first air outlet holes 84 connected to the first channel form a first concentric circle group around the center of the bearing, and the first air outlet holes 84 connected to the second channel form a second concentric circle group around the center of the bearing. The first concentric circle group and the second concentric circle group are arranged alternately. Assume that the first concentric circle group has two concentric circles, namely the first concentric circle and the second concentric circle, and the second concentric circle group also has two concentric circles, namely the third concentric circle and the fourth concentric circle, for example:

[0037] Arrangement 1: The radius of the first concentric circle is the smallest, the radius of the third concentric circle is the second largest, then the radius of the second concentric circle, and the radius of the fourth concentric circle is the largest;

[0038] Arrangement method 2: The radius of the third concentric circle is the smallest, the radius of the first concentric circle is the second, then the radius of the fourth concentric circle, and the radius of the second concentric circle is the largest.

[0039] Preferably, since the first channel is connected to the ventilation channel, in order to facilitate drilling, the radius of the first concentric circle is set to the minimum.

[0040] As an embodiment of the present invention, the first air outlet holes 84 in the first concentric circle group and the first air outlet holes 84 in the second concentric circle group are staggered, that is, the first air outlet holes 84 in each concentric circle and any first air outlet holes 84 in the adjacent concentric circles are not on the same radius, which can effectively improve the overall rigidity and bearing strength.

[0041] As an embodiment of the present invention, the second air outlet holes 85 connected to the first channel are arranged in a first array along the circumference of the bearing, and the second air outlet holes 85 connected to the second channel are arranged in a second array along the circumference of the bearing, and the first array and the second array are staggered. Assume that the first array has two straight lines, namely the first straight line and the second straight line, and the second array has two straight lines, namely the third straight line and the fourth straight line. The arrangement sequence from top to bottom is the first straight line, the third straight line, the second straight line, the fourth straight line, or the third straight line, the first straight line, the fourth straight line, the second straight line, and the second air outlet holes 85 in the first array are staggered with the second air outlet holes 85 in the second array, that is, the second air outlet holes 85 on each straight line are not on the same vertical line with any second air outlet holes 85 on the adjacent straight line, which can effectively improve the overall rigidity and bearing strength.

[0042] See also Figure 3 - Figure 6 As an embodiment of the present invention, the bearing includes a first bearing 86 and a second bearing 87 connected to each other, the first bearing 86 is close to the table 5, and the second bearing 87 is connected to the transition ring 3, wherein a part of the first channel and a part of the second channel are provided inside the first bearing 86 and the second bearing 87, that is, the first channel and the second channel both pass through the first bearing 86 and the second bearing 87, the air cavity 83 is an annular groove, and the annular groove is located on one of the concentric circles of the second concentric circle group, the air cavity 83 is arranged on the surface of the first bearing 86 close to the second bearing 87, or on the surface of the second bearing 87 close to the first bearing 86, the bearing adopts an innovative splicing technology, by adding the air cavity 83 to the bearing and adopting a unique groove ventilation method, the gas is discharged through the first channel and the second channel and forms a stable air film, breaking the problem of limited drilling of large-size bearings in the past, increasing the air flotation area and the overall support rigidity, and providing a guarantee for the realization of high speed.

[0043] As an embodiment of the present invention, a sealing groove 88 is provided on the first bearing 86 and / or the second bearing 87, and a sealing ring is provided in the sealing groove 88, which can effectively improve the air tightness between the first bearing 86 and the second bearing 87, and prevent the gas in the bearing from leaking from the connection between the first bearing 86 and the second bearing 87, thereby affecting the operation of the air-floating turntable.

[0044] See also Figure 7As an embodiment of the present invention, the transition ring 3 includes a first connecting portion 32 connected to the motor 2, a second connecting portion 33 connected to the bearing, and a third connecting portion 34 connecting the first connecting portion 32 and the second connecting portion 33. The air supply port 31 is arranged on the first connecting portion 32, the first end of the air supply channel is arranged on the first connecting portion 32, and the second end of the air supply channel is arranged on the second connecting portion 33. The first connecting portion 32 and the second connecting portion 33 are both cylindrical. The inner diameter of the first connecting portion 32 is larger than the inner diameter of the second connecting portion 33, which reduces the contact area between the transition ring 3 and the bearing, thereby increasing the contact area between the bearing and the thrust plate 7, that is, increasing the air flotation area between the bearing and the thrust plate 7, improving the overall support rigidity, and providing a guarantee for the realization of high speed.

[0045] As an embodiment of the present invention, the height of the second connecting part 33 is at least twice the height of the third connecting part 34. While ensuring that the flotation area is sufficient, the distance between the motor 2 and the bearing can be effectively increased by increasing the height of the second connecting part 33, thereby reducing the impact of the heat generated by the motor 2 on the bearing, avoiding the problem of bearing deformation caused by the heat generated by the motor 2 and causing the flotation to get stuck, and improving the overall working stability and service life of the flotation turntable.

[0046] As an embodiment of the present invention, a heat dissipation slot 35 is provided on the outer side of the first connection portion 32 , which can reduce the temperature of the motor 2 by air cooling, thereby achieving the best performance of the motor 2 .

[0047] As an embodiment of the present invention, a grating 9 is provided on the side of the thrust plate 7 away from the bearing, and a reading head 36 is provided on the transition ring 3. Compared with the traditional structure of locking the grating 9 on the rotating shaft 4, the present invention installs the grating 9 close to the moving center of mass and the table 5, and innovatively connects the grating 9 to the bearing ring 6, getting rid of the previous way of connecting the grating 9 to the rotating shaft 4, solving the installation problem of large-size and high-precision grating 9, facilitating subsequent maintenance and adjustment, and effectively avoiding the risk of error amplification, thereby enabling precise control of the air-floating turntable to achieve high-precision requirements, while saving space at the lower end and making the space concise.

[0048] In summary, the present invention provides an air-floating turntable, the bearing of which adopts an innovative splicing technology. By adding an air cavity 83 to the bearing and adopting a unique groove ventilation method, the gas is discharged through the first channel and the second channel, so that a stable air film is formed between the bearing and the table 5, the bearing ring 6 and the thrust plate 7, and the bearing is constrained from the outside of the bearing, thereby adjusting the posture of the rotating shaft 4, the table 5, the bearing ring 6 and the thrust plate 7, breaking the problem of limited drilling of large-size bearings in the past, increasing the air-floating area and the overall support rigidity, and providing a guarantee for the realization of high speed; the first air outlet 84 in the first concentric circle group and the first air outlet 84 in the second concentric circle group are staggered, and the second air outlet 85 in the first array and the second air outlet 85 in the second array are staggered, both of which can improve the overall rigidity and bearing strength; the sealing groove 88 and the sealing ring can effectively improve the first bearing 86 and the second Air tightness between the bearings 87; the inner diameter of the first connecting part 32 is larger than the inner diameter of the second connecting part 33, which effectively increases the flotation area between the bearing and the thrust plate 7, improves the overall support rigidity, and provides a guarantee for the realization of high speed; the height of the second connecting part 33 is at least twice the height of the third connecting part 34. While ensuring that the flotation area is sufficient, the distance between the motor 2 and the bearing can be effectively increased by increasing the height of the second connecting part 33, thereby reducing the impact of the heat generated by the motor 2 on the bearing, avoiding the problem of deformation of the bearing caused by the heat of the motor 2 leading to flotation jamming, and improving the overall working stability and service life of the flotation turntable; the grating 9 is innovatively connected to the bearing ring 6, which solves the installation problem of large-size and high-precision grating 9, facilitates subsequent maintenance and adjustment, and can effectively avoid the risk of error amplification, so that the flotation turntable can be accurately controlled to meet high-precision requirements.

[0049] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An air-floating turntable, characterized in that: The invention comprises a base plate (1), a motor (2) arranged on the base plate (1), a transition ring (3) arranged on the motor (2), a bearing arranged on the transition ring (3), a rotating shaft (4) driven by the motor (2), and a table (5) arranged at one end of the rotating shaft (4) away from the motor (2); the transition ring (3) and the bearing are both sleeved on the rotating shaft (4); a bearing ring (6) is provided on the outer side of the bearing; a first end of the bearing ring (6) is connected to the table (5); a second end of the bearing ring (6) is provided with a thrust plate (7); the bearing ring (6), the thrust plate (7) and the table (5) all rotate with the rotating shaft (4); An air supply channel is provided in the transition ring (3), an air supply port (31) connected to the air supply channel is provided on the surface of the transition ring (3), a plurality of air outlet holes are provided on the surface of the bearing, a plurality of longitudinal air channels (81), a plurality of transverse air channels (82), and an air cavity (83) are provided inside the bearing, the air outlet holes are connected to at least one of the longitudinal air channels (81) or one of the transverse air channels (82), part of the longitudinal air channels (81) and part of the transverse air channels (82) form a first channel and are connected to the air supply channel, part of the longitudinal air channels (81) and part of the transverse air channels (82) form a second channel, and both the first channel and the second channel are connected to the air cavity (83).

2. The air-floating turntable according to claim 1, characterized in that: The air outlet holes include a first air outlet hole (84) arranged on the end surface of the bearing and a second air outlet hole (85) arranged on the side surface of the bearing. The first air outlet hole (84) is connected to the longitudinal air channel (81), and the second air outlet hole (85) is connected to the transverse air channel (82).

3. The air-floating turntable according to claim 2, characterized in that: The first air outlet holes (84) communicated with the first channel form a first concentric circle group around the center of the bearing, and the first air outlet holes (84) communicated with the second channel form a second concentric circle group around the center of the bearing, and the first concentric circle group and the second concentric circle group are arranged alternately.

4. The air-floating turntable according to claim 2, characterized in that: The second air outlet holes (85) communicated with the first channel are arranged in a first array along the circumference of the bearing, and the second air outlet holes (85) communicated with the second channel are arranged in a second array along the circumference of the bearing, the first array and the second array are staggered, and the second air outlet holes (85) in the first array and the second air outlet holes (85) in the second array are staggered.

5. The air-floating turntable according to any one of claims 1 to 4, characterized in that: The bearing comprises a first bearing (86) and a second bearing (87) connected to each other, wherein the first bearing (86) is close to the table (5), and the second bearing (87) is connected to the transition ring (3); the air cavity (83) is an annular groove, and the air cavity (83) is arranged on a surface of the first bearing (86) close to the second bearing (87), or on a surface of the second bearing (87) close to the first bearing (86).

6. The air-floating turntable according to claim 5, characterized in that: A sealing groove (88) is provided on the first bearing (86) and / or the second bearing (87), and a sealing ring is provided in the sealing groove (88).

7. The air-floating turntable according to claim 1, characterized in that: The transition ring (3) comprises a first connecting portion (32) connected to the motor (2), a second connecting portion (33) connected to the bearing, and a third connecting portion (34) connecting the first connecting portion (32) and the second connecting portion (33); the air supply port (31) is arranged on the first connecting portion (32); the first end of the air supply channel is arranged on the first connecting portion (32); the second end of the air supply channel is arranged on the second connecting portion (33); the first connecting portion (32) and the second connecting portion (33) are both cylindrical; the inner diameter of the first connecting portion (32) is larger than the inner diameter of the second connecting portion (33).

8. The air-floating turntable according to claim 7, characterized in that: The height of the second connecting portion (33) is at least twice the height of the third connecting portion (34).

9. The air-floating turntable according to claim 7, characterized in that: A heat dissipation groove (35) is provided on the outer side of the first connecting portion (32).

10. The air-floating turntable according to claim 1, characterized in that: A grating (9) is provided on the side of the thrust plate (7) away from the bearing, and a reading head (36) is provided on the transition ring (3).

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