Hydrostatic gas bearing direct drive rotary table

Abstract

The technical scheme of the present application provides a kind of static pressure air floatation direct drive rotary table, comprising: casing table, bearing, mixed flow constant pressure gas conveying structure and shaft body;The bearing is inserted in the inside of the casing table, the mixed flow constant pressure gas conveying structure is inserted in the inside of the casing table and is top with the bottom end of the bearing, the shaft body is inserted between the inside of the bearing and the mixed flow constant pressure gas conveying structure;The mixed flow constant pressure gas conveying structure includes mixed flow round box, air inlet pipe, air pump, cone, air float ring and inner tube.The stable air film of the present application is exported by mixed flow constant pressure gas conveying structure to support shaft body, and air pressure difference is not easy to produce, and support is stable, and the air circulation of air flow channel, shaft hole and air float flow channel supports rotary table body by air float, and the gap between shaft shoulder and air float ring cooperates with extended flow channel, and air film is generated to lower section of shaft body, and air film is cooperated with upper section, and air film is wrapped around most of shaft body, and friction loss is reduced, and rotation accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct drive rotary tables, and in particular to a static pressure air floating direct drive rotary table. BACKGROUND

[0002] Air floating technology is a technology that uses air instead of oil lubrication to provide high radial and circumferential rotation accuracy.

[0003] For example, a high-precision air floating rotary table easy to assemble, the main shaft can rotate inside, driving the upper turntable to realize the function of the air floating rotary table, and the air floating technology can improve the rotation accuracy.

[0004] For the air floating of the rotary table, the air film is formed by air to provide supporting force, but if the branch pipes are of different lengths under the condition that the same air pump is the source, air pressure difference is easily generated in the conveying process, so that the supporting force on one side is weaker than that on the other side, resulting in vibration and skew of the shaft body when the air film supports the shaft body, affecting the stability of the support, and therefore a high-efficiency air floating structure with more uniform air pressure output is needed to improve the stability of the air floating direct drive rotary table. SUMMARY

[0005] Therefore, it is necessary to provide a static pressure air floating direct drive rotary table to solve the technical problem of unstable air film support caused by air pressure difference in branch pipes.

[0006] To achieve the above technical purpose, the technical scheme of the present application provides a static pressure air floating direct drive rotary table, comprising: a sleeving table, a bearing, a mixed flow constant pressure air conveying structure and a shaft body; the bearing is inserted into the inside of the sleeving table, the mixed flow constant pressure air conveying structure is inserted into the inside of the sleeving table and is in top-to-bottom combination with the bottom end of the bearing, and the shaft body is inserted between the inside of the bearing and the inside of the mixed flow constant pressure air conveying structure.

[0007] The mixed flow constant pressure air conveying structure comprises a mixed flow round box, an air inlet pipe, an air pump, a conical cylinder, an air floating ring and an inner cylinder; the number of the air inlet pipe and the air pump is four, and the four air inlet pipes are circumferentially distributed and are tangent to and fixed to the mixed flow round box, the four air pumps are respectively arranged at one end of the four air inlet pipes away from the mixed flow round box, the conical cylinder is arranged at the top of the mixed flow round box, the air floating ring is arranged at the top of the conical cylinder, the inner cylinder is arranged at the bottom of the air floating ring, and the conical cylinder, the air floating ring and the inner cylinder are coaxial with the mixed flow round box; a plurality of air conveying openings are circumferentially arranged at the top of the air floating ring.

[0008] Further, the mixed-flow constant-pressure air conveying structure and the inner cylinder form an annular cavity, the annular cavity is in communication with the inside of the conical cylinder, and the inside of the conical cylinder and the outside of the inner cylinder form a conical cavity.

[0009] Further, the air inlet comprises a circular hole and an open mouth, the circular hole is in communication with the conical cavity, and the open mouth is in communication with the circular hole.

[0010] Further, the shaft body comprises a stepped shaft, a fixed shaft and a telescopic structure, the telescopic structure is arranged between the opposite ends of the stepped shaft and the fixed shaft.

[0011] Further, the top end of the shaft body is provided with a rotary table body, the top of the sleeving table is provided with a shaft hole, the shaft body is provided with a shaft shoulder, and the position of the shaft shoulder corresponds to the position of the open mouth.

[0012] Further, the telescopic structure comprises an insertion shaft, a spline, a slot and a spring, the slot is arranged at the top of the fixed shaft, the insertion shaft is fixed at the bottom end of the stepped shaft, the spline is arranged on the outside of the insertion shaft, and the spring is fixed between the inner bottom wall of the slot and the bottom end of the insertion shaft.

[0013] Further, the bottom of the sleeving table is provided with an outer shell body, the mixed-flow constant-pressure air conveying structure is fixed to the inner bottom wall of the outer shell body, and the four air inlet pipes all penetrate through the outer shell body.

[0014] Further, the bottom of the outer shell body is provided with a driving box, the inside of the driving box is provided with a driving assembly, and the outside of the driving box is provided with an exhaust hole.

[0015] Further, the driving assembly comprises a driving motor, a worm and a turbine, the driving motor is arranged on the driving box, the worm is connected with the output shaft of the driving motor, the turbine is rotatably connected to the inside of the driving box, the turbine is fixedly connected with the shaft body, and the worm is engaged with the turbine.

[0016] Further, the sleeving table comprises a table plate and a positioning cylinder, the positioning cylinder is fixed to the bottom of the table plate, the bearing is inserted into the inside of the positioning cylinder, the top of the table plate is provided with a shaft hole, and the top end of the shaft body penetrates through the shaft hole and extends above the table plate.

[0017] Compared with the prior art, the beneficial effects of the present application are that the shaft body is supported by the stable air film output by the mixed-flow constant-pressure air conveying structure, air pressure difference is not easy to be generated, support is stable, air circulation is realized through the air flow channel, the shaft hole and the air floating flow channel, the rotary table body is air-floating supported, the air film is generated on the lower section of the shaft body through the gap between the shaft shoulder and the air floating ring and the extended flow channel, the upper section of the shaft body is air-floating supported, the shaft body is wrapped by the air film on the most part, friction loss is reduced, and rotation accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the static pressure gas floating direct drive rotary table according to the embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the static pressure gas floating direct drive rotary table without the shell according to the embodiment of the present application;

[0020] Figure 3 is a sectional view of the static pressure gas floating direct drive rotary table according to the embodiment of the present application;

[0021] Figure 4 is a three-dimensional view of the mixed flow constant pressure gas conveying structure according to the embodiment of the present application;

[0022] Figure 5 is a sectional view of B-B of the mixed flow constant pressure gas conveying structure according to the embodiment of the present application; Figure 4

[0023] Figure 6 is a partial enlarged view of A of the mixed flow constant pressure gas conveying structure according to the embodiment of the present application; Figure 3

[0024] In the figure: 1, the set table; 11, the table plate; 12, the positioning cylinder; 13, the shell body; 1a, the shaft hole;

[0025] 2, the bearing; 2a, the air flow channel;

[0026] 3, the mixed flow constant pressure gas conveying structure; 31, the mixed flow round box; 32, the air inlet pipe; 33, the gas pump; 34, the tapered cylinder; 35, the gas floating ring; 36, the inner cylinder; 3a, the annular cavity; 3b, the tapered cavity; 3c, the round hole; 3d, the open mouth; 3e, the extended flow channel;

[0027] 4, the shaft body; 41, the stepped shaft; 42, the fixed shaft; 43, the telescopic structure; 431, the inserted shaft; 432, the spline; 433, the spring; 434, the insertion slot; 44, the shaft shoulder;

[0028] 5, the rotary table body; 5a, the gas floating flow channel;

[0029] 6, the drive box; 61, the drive assembly; 611, the drive motor; 612, the worm; 613, the turbine; 62, the exhaust hole. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present application are specifically described below in conjunction with the drawings, wherein the drawings form a part of the present application and are used to explain the principles of the embodiments of the present application, but are not used to limit the scope of the present application.

[0031] As Figures 1-5 ​​As shown, the present application provides a static pressure gas bearing direct drive rotary table, which comprises a sleeve table 1, a bearing 2, a mixed flow constant pressure gas conveying structure 3 and a shaft body 4; the sleeve table 1 is a table body with a stepped hole in the center, the bearing 2 is inserted into the stepped hole on the inside of the sleeve table 1, and the top end of the bearing 2 is combined with the top of the stepped hole; the mixed flow constant pressure gas conveying structure 3 is inserted into the inside of the sleeve table 1 and is combined with the bottom end of the bearing 2, and the mixed flow constant pressure gas conveying structure 3 supports the bottom of the bearing 2; the shaft body 4 is inserted between the inside of the bearing 2 and the mixed flow constant pressure gas conveying structure 3, and the shaft body 4 rotates between the inside of the bearing 2 and the mixed flow constant pressure gas conveying structure 3, wherein the gap between the bearing 2 and the shaft body 4 is an air flow channel 2a, and the mixed flow constant pressure gas conveying structure 3 is used to convey air to the air flow channel 2a between the bearing 2 and the shaft body 4 to generate a uniform air film to support the shaft body 4.

[0032] Wherein, the mixed flow constant pressure gas conveying structure 3 comprises a mixed flow round box 31, an air inlet pipe 32, a gas pump 33, a tapered cylinder 34, a gas bearing ring 35 and an inner cylinder 36; the number of the air inlet pipe 32 and the gas pump 33 is four, and the four air inlet pipes 32 are circumferentially distributed and are tangent to and fixed with the mixed flow round box 31, and the four gas pumps 33 are respectively arranged at one end of the four air inlet pipes 32 away from the mixed flow round box 31, so that the four gas pumps 33 are used as air sources to uniformly and efficiently input air, and compared with a single air source, multiple air sources can more efficiently and strongly output air flow; the tapered cylinder 34 is arranged at the top of the mixed flow round box 31, the outer diameter of the tapered cylinder 34 is smaller than the outer diameter of the mixed flow round box 31, and the bottom of the tapered cylinder 34 is not blocked with the mixed flow round box 31, so as to communicate between the tapered cylinder 34 and the mixed flow round box 31; the gas bearing ring 35 is fixedly connected to the top of the tapered cylinder 34, the outer diameter of the gas bearing ring 35 is equal to the outer diameter of the tapered cylinder 34, the inner cylinder 36 is arranged at the bottom of the gas bearing ring 35, the inner diameter of the inner cylinder 36 is equal to the inner diameter of the gas bearing ring 35, the inner cylinder 36 is inserted into the inside of the mixed flow round box 31 and the tapered cylinder 34, and the bottom end of the inner cylinder 36 is closed with the inner bottom wall of the mixed flow round box 31 to form an annular space in the inside of the mixed flow round box 31; the tapered cylinder 34, the gas bearing ring 35 and the inner cylinder 36 are coaxial with the mixed flow round box 31, so that when the mixed gas flows to the center in the inside of the mixed flow round box 31, the mixed gas can be uniformly mixed and flows to the tapered cylinder 34 and the gas bearing ring 35; a plurality of air conveying ports are circumferentially arranged at the top of the gas bearing ring 35, and the air conveying ports are located between the inside of the tapered cylinder 34 and the outside of the inner cylinder 36, so that the mixed gas can be smoothly output to the air conveying ports.

[0033] Specifically, during operation, the four air pumps 33 simultaneously output air, which enters the mixing round box 31 through the air inlet pipes 32, is guided to the inner wall of the mixing round box 31 in a tangential direction, and flows along the inner wall, so that the four air flows are mixed and flow to the center of the mixing round box 31, where the four air flows are uniformly pressurized, so that the air is mixed into air with uniform pressure and enters the inside of the conical cylinder 34, then enters the air outlet holes distributed in the circumference, and is directly output to the air flow channel 2a in the circumference, thereby generating an air film with uniform pressure, supporting the shaft body 4, and generating the air film by simultaneously inputting air by the multi-source air pump 33, mixing and pressurizing, and outputting, so that air pressure difference is not easy to occur, the air film forming efficiency is high, and the air film is more stable.

[0034] It can be understood that the number of air pumps 33 can also be two, three, four or more, as long as they are evenly distributed in the circumference and tangent to the mixing round box 31, and can achieve the purpose of mixing and uniform pressure.

[0035] In this embodiment, in order to protect the internal components, the bottom of the set table 1 is provided with an outer shell 13, which is in the shape of a cylinder, and is connected to the table plate 11 by bolts. The mixing constant pressure air supply structure 3 is fixed to the inner bottom wall of the outer shell 13, and the four air inlet pipes 32 penetrate the outer shell 13, and the four air pumps 33 are located outside the outer shell 13.

[0036] It can be understood that the outer shell 13 can also be square, and the outer shell 13 can play a protective role for the internal components.

[0037] In some embodiments, in order to achieve better air floating effect, with reference to Figure 3 and Figure 6, the annular cavity 3a is in communication with the inside of the conical cylinder 34, the inside of the conical cylinder 34 is in communication with the outside of the inner cylinder 36, and the annular cavity 3a is formed between the mixed flow round box 31 and the inner cylinder 36. The gas output by the air pump 33 first enters the annular cavity 3a for mixed flow pressure equalization, then flows into the conical cavity 3b, and finally is output by the air outlet. The air outlet includes a round hole 3c and an open mouth 3d, the round hole 3c is in communication with the conical cavity 3b, the open mouth 3d is in communication with the round hole 3c, and the air enters from the round hole 3c and is discharged from the open mouth 3d. The shaft body 4 includes a stepped shaft 41, a fixed shaft 42, and a telescopic structure 43, the telescopic structure 43 is arranged between the opposite ends of the stepped shaft 41 and the fixed shaft 42, and the telescopic structure 43 enables the shaft body to be slightly lifted when the air floats. The top end of the shaft body 4 is provided with a turntable body 5, the turntable body 5 is located at the top of the sleeving table 1, and the gap between the bottom of the turntable body 5 and the top of the sleeving table 1 is an air floating flow channel 5a. The top of the sleeving table 1 is provided with a shaft hole 1a, and the shaft hole 1a corresponds to the position of the air flow channel 2a. The shaft body 4 is provided with a shaft shoulder 44, the position of the shaft shoulder 44 corresponds to the position of the open mouth 3d, and the shaft shoulder 44 is lifted when the air flows out of the open mouth 3d. The gap between the inner cylinder 36 and the shaft body 4 is an extension flow channel 3e, and the extension flow channel 3e is directly communicated to the outside of the outer shell 13 when the shaft shoulder 44 is lifted.

[0038] Specifically, the air is mixed and pressure-equalized in the annular cavity 3a, then flows through the conical cavity 3b and the round hole 3c, and finally is discharged from the open mouth 3d. Part of the air discharged from the open mouth 3d passes through the shaft hole 1a from the air flow channel 2a, forms an air film in the air floating flow channel 5a, air-floats the turntable body 5, prevents the turntable body 5 from rubbing against the top of the sleeving table 1, and at this time the shaft body 4 is stretched. Another part of the air discharged from the open mouth 3d supports the shaft shoulder 44 when the shaft shoulder 44 is lifted to form a gap, flows downward from the extension flow channel 3e, forms an air film, separates the inner cylinder 36 and the shaft body 4, and forms an air film between the shaft body 4 and the outer shell 13, and thus flows out, so that the shaft body 4 and the turntable body 5 are both air-floated by the air film. Most of the shaft body 4 is wrapped in the air film, which greatly reduces the generation of friction.

[0039] In a certain embodiment, in order to achieve the telescopic purpose of the shaft body 4, reference is made to Figure 6The telescopic structure 43 comprises an insertion shaft 431, a spline 432, a slot 434 and a spring 433. The slot 434 is arranged on the top of the fixed shaft 42. The insertion shaft 431 is fixed on the bottom end of the stepped shaft 41. The insertion shaft 431 is inserted into the slot 434, and the inner shape of the slot 434 matches the spline 432. The spline 432 is arranged on the outer side of the insertion shaft 431. The spline 432 is also inserted into the slot 434. The spline 432 and the slot 434 are connected to drive the fixed shaft 42 and the stepped shaft 41. The spring 433 is arranged between the inner bottom wall of the slot 434 and the bottom end of the insertion shaft 431. The spring 433 connects the fixed shaft 42 and the stepped shaft 41, and buffers when pressed. The inner side of the slot 434 is also provided with a limiting ring 435. When the shaft body 4 floats, the limiting ring 435 limits the top of the spline 432. When the shaft body 4 floats, the top of the spline 432 is in contact with the limiting ring 435, thereby improving the stability of the shaft body 4 when floating.

[0040] It can be understood that the telescopic structure 43 can satisfy the stable telescopic function of the shaft body 4 under the air floating effect. In addition, when the shaft body 4 floats, the stepped shaft 41 moves upwards, the tension spring 433 is stretched, and the spline 432 and the insertion shaft 431 are still inserted into the slot 434. When the shaft body 4 rotates, the transmission can be performed.

[0041] In an embodiment, in order to achieve the rotation driving of the shaft body 4, referring to Figure 1 and Figure 2 The bottom of the outer shell 13 is provided with a driving box 6. The inside of the driving box 6 is provided with a driving assembly 61. The driving assembly 61 is connected with the shaft body 4 to drive the rotation of the shaft body 4. The outer side of the driving box 6 is provided with an exhaust hole 62. The exhaust hole 62 is used to exhaust the airflow below when the shaft body 4 as a whole floats.

[0042] Further, the driving assembly 61 comprises a driving motor 611, a worm 612 and a turbine 613. The driving motor 611 is arranged on the driving box 6. The worm 612 is connected with the output shaft of the driving motor 611. The turbine 613 is rotatably connected to the inner side of the driving box 6. The turbine 613 is fixedly connected with the shaft body 4. The worm 612 is engaged with the turbine 613. The worm 612 is driven to rotate by the driving motor 611, and the turbine 613 is driven to rotate by the worm 612, thereby driving the shaft body 4 to rotate.

[0043] It can be understood that the driving box 6 is divided into two identical shells from the middle. The two shells are connected by bolts and nuts, which is convenient for separating the driving box 6 and installing the driving assembly 61.

[0044] In an embodiment, in order to position the bearing 2 and the shaft body 4, referring to Figure 1 ,Figure 2 And Figure 3 The settable table 1 comprises a table plate 11 and a positioning cylinder 12, the table plate 11 is circular in shape, and the outer diameter of the table plate 11 is equal to the outer diameter of the rotary table body 5, the positioning cylinder 12 is fixed at the bottom of the table plate 11, the bearing 2 is inserted into the inside of the positioning cylinder 12, the bearing 2 is positioned by the positioning cylinder 12, the top of the table plate 11 is provided with a shaft hole 1a, the top end of the shaft body 4 penetrates through the shaft hole 1a and extends above the table plate 11, and the shaft body 4 is positioned by the bearing 2 and the shaft hole 1a.

[0045] In the assembly, the mixed flow constant pressure gas conveying structure 3 and the outer shell 13 are fixedly installed, the positioning cylinder 12 and the table plate 11 are fixedly installed, the shaft body 4 is inserted into the inside of the mixed flow constant pressure gas conveying structure 3, then the bearing 2 is sleeved outside the shaft body 4, the bearing 2 is attached to the top of the mixed flow constant pressure gas conveying structure 3, then the positioning cylinder 12 is sleeved outside the mixed flow constant pressure gas conveying structure 3 and the shaft body 4, the table plate 11 is attached to the top of the bearing 2, then the outer shell 13 is fixed with the table plate 11 by bolts, and finally the shaft body 4 is connected with the turbine 613.

[0046] The specific working principle of the present application is that the air is mixed and pressure-equalized, four air inlet pipes 32 arranged tangentially outside the mixed flow round box 31 are connected with air pumps 33, four air flows are input into the mixed flow round box 31 by the four air pumps 33, under the circular structure, the air flows are spirally mixed, then enter the inside of the conical cylinder 34 and are discharged through the uniformly distributed gas conveying outlets in the circumference, so that the purpose of uniformly outputting the mixed and pressure-equalized air flows is achieved, and the stable air film is easily generated to support the shaft body 4; the air film is fully wrapped, four air flows are mixed and pressure-equalized by the annular cavity 3a, the mixed air is uniformly output into the air flow channel 2a through the conical cavity 3b, the round hole 3c and the open mouth 3d, the air film is formed in the air flow channel 2a and is communicated to the air floating flow channel 5a through the shaft hole 1a, the air film is formed in the air floating flow channel 5a and air floats the rotary table body 5 upward, so that the shaft body 4 is stretched and the shaft shoulder 44 is lifted, at this time, the air in the open mouth 3d is divided into one branch and enters the extension flow channel 3e, so that the air film is generated in the extension flow channel 3e, and finally the air film is discharged from the bottom of the outer shell 13, the air film wraps most of the shaft body 4, and the rotary table body 5 is air floated to reduce most of the friction and provide more stable and accurate rotation accuracy.

[0047] The whole working process is ended, and the contents not described in detail in the specification all belong to the prior art known by the person skilled in the art.

[0048] The above description is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A static pressure air flotation direct drive turntable, characterized in that, include: The assembly includes a platform, a bearing, a mixed-flow constant-pressure gas transmission structure, and a shaft. The bearing is inserted into the inner side of the platform, the mixed-flow constant-pressure gas transmission structure is inserted into the inner side of the platform and abuts against the bottom end of the bearing, and the shaft is inserted between the bearing and the inner side of the mixed-flow constant-pressure gas transmission structure. The mixed-flow constant-pressure gas delivery structure includes a mixed-flow circular box, air inlet pipes, air pumps, a cone, an air flotation ring, and an inner cylinder. There are four air inlet pipes and four air pumps, arranged circumferentially and tangent to and fixed to the mixed-flow circular box. The four air pumps are respectively located at the ends of the four air inlet pipes furthest from the mixed-flow circular box. The cone is located at the top of the mixed-flow circular box, the air flotation ring is located at the top of the cone, and the inner cylinder is located at the bottom of the air flotation ring. The cone, air flotation ring, and inner cylinder are all coaxial with the mixed-flow circular box. The inner cylinder is inserted inside the mixed-flow circular box and the cone, and its bottom end closes to the inner bottom wall of the mixed-flow circular box, forming an annular space within the mixed-flow circular box. The top of the air flotation ring has several air delivery ports arranged circumferentially.

2. The static pressure air flotation direct drive turntable according to claim 1, characterized in that... An annular cavity is formed between the mixing circular box and the inner cylinder. The annular cavity is connected to the inside of the cone cylinder. A conical cavity is formed between the inside of the cone cylinder and the outside of the inner cylinder.

3. The static pressure air flotation direct drive turntable according to claim 2, characterized in that... The air inlet includes a circular hole and an open opening. The circular hole is connected to the conical cavity, and the open opening is connected to the circular hole.

4. The static pressure air flotation direct drive turntable according to claim 3, characterized in that, The shaft body includes a stepped shaft, a fixed shaft, and a telescopic structure, wherein the telescopic structure is disposed between the opposite ends of the stepped shaft and the fixed shaft.

5. The static pressure air flotation direct drive turntable according to claim 4, characterized in that, The top of the shaft is provided with a turntable body, the top of the mounting platform is provided with a shaft hole, and the shaft is provided with a shaft shoulder, the position of which corresponds to the position of the opening.

6. The static pressure air flotation direct drive turntable according to claim 5, characterized in that, The telescopic structure includes an insertion shaft, a spline, a slot, and a spring. The slot is located at the top of the fixed shaft, the insertion shaft is fixed at the bottom of the stepped shaft, the spline is located on the outside of the insertion shaft, and the spring is fixed between the inner bottom wall of the slot and the bottom of the insertion shaft.

7. The static pressure air flotation direct drive turntable according to claim 1, characterized in that, The bottom of the set platform is provided with an outer shell, the mixed flow constant pressure air supply structure is fixed to the inner bottom wall of the outer shell, and all four air inlet pipes penetrate the outer shell.

8. The static pressure air flotation direct drive turntable according to claim 7, characterized in that, The bottom of the outer casing is provided with a drive box, the inside of the drive box is provided with a drive assembly, and the outside of the drive box is provided with an exhaust port.

9. The static pressure air flotation direct drive turntable according to claim 8, characterized in that, The drive assembly includes a drive motor, a worm gear, and a turbine. The drive motor is mounted on a drive housing. The worm gear is connected to the output shaft of the drive motor. The turbine is rotatably connected inside the drive housing. The turbine is fixedly connected to a shaft, and the worm gear meshes with the turbine.

10. The static pressure air flotation direct drive turntable according to claim 1, characterized in that, The set platform includes a platform and a positioning cylinder. The positioning cylinder is fixed to the bottom of the platform, and the bearing is inserted into the inside of the positioning cylinder. The top of the platform has a shaft hole, and the top end of the shaft passes through the shaft hole and extends to the top of the platform.

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