An air cushion and an air bearing assembly using the air cushion

Abstract

An air cushion and an air bearing assembly using the air cushion. A pressure equalizing groove, a plurality of throttle holes and a plurality of air cavities are provided on the working surface of the air cushion. The pressure equalizing groove is recessed downward from the working surface of the air cushion. The throttle holes are distributed on the pressure equalizing groove. The air cavities are correspondingly arranged at the positions of the throttle holes and are coaxial with the throttle holes. An air passage is provided in the air cushion. An air hole for communicating the air passage with the throttle hole is provided at the position of the air passage corresponding to the throttle hole. The inner diameter of the air hole is larger than the inner diameter of the throttle hole. At least one first threaded hole communicating with the air passage and used for installing a plug and a nozzle hole communicating with the air passage and used for installing a nozzle are provided on the side surface of the air cushion. An installation hole for installing a rocking pair is provided at the center position of the back surface of the air cushion. The pressure equalizing groove, the throttle holes, the air cavities, etc. in the air cushion are directly formed on the working surface, which is integrally formed by machining in a machining center, without designing assembly structures such as installation holes, short round pipes, ruby bearings, etc., and has good working effects and meets the requirements.

Description

Technical Field

[0001] The present invention relates to an air cushion and an air bearing assembly using the air cushion. Background Art

[0002] Currently, the guide rails in the X, Y, and Z directions of a coordinate measuring machine mostly adopt an air floating system, which consists of a guide rail, an air cushion, and a thrust transmission and adjustment mechanism supporting the air cushion. Among them, the working surface of the existing air cushion usually has a pressure equalizing groove, a mounting hole, a short circular tube, a ruby bearing, and an air cavity. The pressure equalizing groove is formed on the working surface of the air cushion by machining. The center of the mounting hole is located at the intersection of the pressure equalizing grooves. The short circular tube is arranged in the mounting hole, and the outer cylindrical surface of the short circular tube is in precise micro-pressure fit with the mounting hole. The ruby bearing is in interference fit with the short circular tube. The central hole of the ruby bearing is a throttling hole, which is attached to the center of one end face of the short circular tube. The end face of the ruby bearing faces the working surface of the air cushion and is lower than the working surface of the air cushion. The space depth formed by the end face of the ruby bearing and the working surface of the air cushion is called the air cavity depth. Among them, the air cavity depth needs to be controlled within a specific range. The optimization of various elements enables both the load and the air vibration starting pressure of the air cushion to reach the design index, but this press-in depth is very difficult to control. In addition, when the short circular tube is pressed into the mounting hole, the precision requirement for the micro-pressure fit is very high. If the interference amount is too large, the periphery of the mounting hole will be deformed, the flatness of the working surface of the air cushion will become worse, and the matrix of the air cushion is mostly made of aluminum material. Its working surface is subjected to hard anodizing treatment, and there is a risk of cracking or even chipping of the hard anodized layer around the mounting hole. The shape of the air cavity is irregular, which affects the performance of the air cushion. The hardness of the cracked particles is relatively high, and it is possible to scratch the working surface of the air cushion and the guide rail. If the press-in depth of the short circular tube is excessive, it is easy to cause air vibration, and the measuring machine will not be able to work properly. Thus, it can be seen that the manufacturing and assembly process requirements of the existing air cushion are very high, and the manufacturing and assembly are relatively difficult.

[0003] In view of this, it is necessary to make certain improvements to the existing air cushion to obtain an air cushion with simple manufacturing and good working effects. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an air cushion with simple manufacturing and good working effects and an air bearing assembly using the air cushion.

[0005] To solve the above technical problems, the present invention discloses the following technical solutions. An air cushion, on the working surface of which there is a pressure equalizing groove, a plurality of throttle holes and a plurality of air cavities. The pressure equalizing groove is recessed downward from the working surface of the air cushion. The throttle holes are distributed on the pressure equalizing groove. The air cavities are correspondingly arranged at the positions of the throttle holes and are coaxial with the throttle holes. An air passage is provided inside the air cushion. At the position corresponding to the throttle hole on the air passage, there is a pore for connecting the air passage and the throttle hole, and the inner diameter of the pore is larger than that of the throttle hole. At least one first threaded hole for installing a plug and communicating with the air passage and a nozzle hole for installing a nozzle and communicating with the air passage are provided on the side surface of the air cushion. The first threaded hole and the nozzle hole communicate with the air passage. An installation hole for installing a rocking pair is provided at the center position of the back surface of the air cushion.

[0006] A further technical solution of it is that: on the back surface of the air cushion, at the position corresponding to the pore, there is also a second threaded hole communicating with the pore.

[0007] A further technical solution of it is that: the depth of the pressure equalizing groove is lower than or equal to the depth of the air cavity.

[0008] A further technical solution of it is that: the air cushion is in a cuboid shape. The pressure equalizing groove includes four pressure dividing grooves parallel to the four sides on the working surface of the air cushion and perpendicular to each other. There are four throttle holes and four air cavities on the air cushion. The throttle holes are respectively arranged at the intersection centers of the pressure dividing grooves. The air cavities are respectively arranged at the intersection positions of the pressure dividing grooves. The air passage is formed by enclosing a rectangular cavity by four sub-air passages. The first threaded hole and the nozzle hole are both perpendicularly penetrated with the sub-air passages. The second threaded hole is perpendicularly penetrated with the pore.

[0009] A further technical solution of it is that: there are three first threaded holes and one nozzle hole on the air cushion. The first threaded hole and the nozzle hole are arranged on two adjacent side surfaces of the air cushion.

[0010] An air bearing assembly includes the air cushion described above and a rocking pair arranged in the installation hole.

[0011] Its further technical solution is as follows: The rocking pair includes a load-bearing column, a retaining ring, a support rod, and a wire retaining ring. A coaxial conical pit is formed by the load-bearing column recessing downward from the center of the top surface. A slot hole that is coaxial with the conical pit and penetrates the bottom surface of the load-bearing column is formed at the small-diameter end of the conical pit. The retaining ring is fixedly sleeved in the slot hole, and a first annular groove is provided on the inner wall surface of the retaining ring. The support rod includes a stud, a polyhedron provided at one end of the stud, and a spherical socket portion provided at the other end of the stud. The spherical socket portion includes a spherical table portion that is connected to the stud and is in movable contact with the inner wall surface of the conical pit, and a socket column that is connected to the spherical table portion and is fitted and sleeved in the retaining ring. A second annular groove is formed on the outer wall surface of the socket column at a position corresponding to the first annular groove. When the socket column is fixedly sleeved in the retaining ring, there is a first movable gap between the bottom surface of the socket column and the bottom surface of the retaining ring, and there is a second movable gap between the retaining ring and the bottom surface of the spherical table portion. The wire retaining ring is arranged in the accommodation cavity formed by the first annular groove and the second annular groove to realize the fixed sleeving of the retaining ring and the support rod.

[0012] Its further technical solution is as follows: The spherical table portion includes a first column body connected to the stud and a hollow spherical table fixedly sleeved on the first column body. The spherical surface of the hollow spherical table is in movable contact with the inner wall surface of the conical pit.

[0013] Its further technical solution is as follows: The spherical table portion includes a solid spherical table connected to the stud, and the spherical surface of the solid spherical table is in movable contact with the inner wall surface of the conical pit.

[0014] Its further technical solution is as follows: The spherical table portion includes a second column body connected to the stud and a hemispherical table provided at the other end of the second column body. The spherical surface of the hemispherical table is in movable contact with the inner wall surface of the conical pit.

[0015] The beneficial technical effect of the present invention is that a pressure equalizing groove, a plurality of throttle holes, and a plurality of air cavities are provided on the working surface of the air cushion. An air passage is provided inside the air cushion. At least one first threaded hole and a nozzle hole are opened on the side surface of the air cushion. Among them, the pressure equalizing groove, throttle holes, air cavities, etc. in the air cushion are directly formed on the working surface of the air cushion. It is integrally formed by machining in a machining center. Its structure is stable. There is no need to design assembly structures such as mounting holes, short round tubes, and ruby bearings, that is, there is no need for additional assembly of components. It will not have problems such as the hard anodized layer around the mounting hole cracking, the air cavity shape being irregular, and air vibration caused by improper assembly of short round tubes and ruby bearings, etc. And it can well realize the function of the air cushion during operation, with good working effect and meeting the production and use requirements. Description of the Drawings

[0016] Figure 1It is a schematic structural diagram of an embodiment of the air cushion in the present invention;

[0017] Figure 2 It is another schematic structural diagram of an embodiment of the air cushion in the present invention;

[0018] Figure 3 It is a schematic cross-sectional structural diagram of an embodiment of the air cushion in the present invention;

[0019] Figure 4 It is an exploded structural diagram of the first embodiment of the air bearing assembly in the present invention;

[0020] Figure 5 It is a schematic cross-sectional structural diagram of the first embodiment of the air bearing assembly in the present invention;

[0021] Figure 6 It is an exploded structural diagram of the second embodiment of the air bearing assembly in the present invention;

[0022] Figure 7 It is a schematic cross-sectional structural diagram of the second embodiment of the air bearing assembly in the present invention;

[0023] Figure 8 It is an exploded structural diagram of the third embodiment of the air bearing assembly in the present invention;

[0024] Figure 9 It is a schematic cross-sectional structural diagram of the third embodiment of the air bearing assembly in the present invention. Detailed implementation manners

[0025] To more fully understand the technical content of the present invention, the technical solutions of the present invention are further introduced and described below with reference to the schematic diagrams, but not limited thereto.

[0026] As Figures 1 to 3 shown, in the present invention, a pressure equalizing groove 10, a plurality of throttle holes 11 and a plurality of air cavities 12 are provided on the working surface of the air cushion 1. The pressure equalizing groove 10 is recessed downward from the working surface of the air cushion 1. The throttle holes 11 are distributed on the pressure equalizing groove 10. The air cavities 12 are correspondingly provided at the positions of the throttle holes 11 and are coaxial with the throttle holes 11. An air passage 13 is provided in the air cushion 1. A pore 14 for communicating the air passage 13 with the throttle hole 11 is provided at the position corresponding to the throttle hole 11 on the air passage 13. The inner diameter of the pore 14 is larger than the inner diameter of the throttle hole 11. At least one first threaded hole 15 for installing a plug and communicating with the air passage 13 and a nozzle hole 16 for installing a nozzle and communicating with the air passage 13 are opened on the side surface of the air cushion 1. The first threaded hole 15 and the nozzle hole 16 communicate with the air passage 13. An installation hole 17 for installing a rocking pair is provided at the center position of the back surface of the air cushion 1.

[0027] The throttle holes 11, air chambers 12, etc. in the air cushion 1 are directly formed on the working surface of the air cushion 1. They can be integrally formed by machining in a machining center. The structure is stable and there is no need for additional assembly of components. It can replace the structure assembled with mounting holes 17, short round tubes, ruby bearings, etc. in the prior art, and problems such as cracking of the hard anodized layer around the mounting holes 17, irregular air chamber shapes, and air vibration caused by improper assembly of short round tubes and ruby bearings will not occur. The production is simple and convenient.

[0028] During actual use, the air cushion 1 is installed at the corresponding working position, and a plug is installed in the first threaded hole 15. At the same time, a nozzle is connected in the nozzle hole 16. During operation, gas is introduced into the air passage 13 of the air cushion 1 through the nozzle, and the air cushion 1 can start working. It is not easy to have problems such as air vibration, and the working effect is good.

[0029] To facilitate the drilling of the air holes 14, as Figure 3 shown, in this embodiment, a second threaded hole 18 communicating with the air hole 14 is further provided at the position corresponding to the air hole 14 on the back surface of the air cushion 1.

[0030] In this embodiment, as Figure 1 and Figure 3 shown, the air chamber 12 is designed to be circular, and the depth of the pressure equalizing groove 10 is equal to the depth of the air chamber 12. In some other embodiments, the depth of the pressure equalizing groove 10 can also be lower than the depth of the air chamber 12.

[0031] In this embodiment, as Figures 1 to 3 shown, the air cushion 1 is in the shape of a cuboid. The pressure equalizing groove 10 includes four pressure dividing grooves 100 parallel to the four sides on the working surface of the air cushion 1 and perpendicular to each other at intersections. There are four throttle holes 11 and four air chambers 12 on the air cushion 1. The throttle holes 11 are respectively arranged at the intersection centers of the pressure dividing grooves 100, and the air chambers 12 are respectively arranged at the intersection positions of the pressure dividing grooves 100. The air passage 13 is formed by four sub-air passages enclosing a rectangular cavity shape. The first threaded hole 15 and the nozzle hole 16 are both vertically penetrated through the sub-air passages. The second threaded hole 18 is vertically penetrated through the air hole 14.

[0032] In this embodiment, the first threaded hole 15 and the nozzle hole 16 are designed to be vertically penetrated through the air passage 13, and at the same time, the second threaded hole 18 is designed to be vertically penetrated through the air hole 14. In this way, when manufacturing the air cushion 1, the air passage 13 and the air hole 14 can be completed by directly drilling into the interior of the air cushion 1 through the first threaded hole 15, the nozzle hole 16, and the second threaded hole 18, which is convenient for manufacturing.

[0033] In this embodiment, as Figure 1 and Figure 2 shown, there are three first threaded holes 15 and one nozzle hole 16 on the air cushion 1. The first threaded hole 15 and the nozzle hole 16 are arranged on two adjacent side surfaces of the air cushion 1.

[0034] In some other embodiments, the air cushion 1 can be designed in a cylindrical shape, the pressure equalizing groove 10 can be designed in an annular shape, the throttle holes 11 are uniformly distributed on the pressure equalizing groove 10, the air cavity 12 is correspondingly arranged at the position of the throttle hole 11, and the air passage 13 in the air cushion 1 is designed in an annular shape or can be designed in other shapes. Of course, for the convenience of processing and manufacturing, the air passage 13 of the air cushion 1 is usually formed by the cross-connection of two sub-air passages. Among them, the first threaded hole 15 is vertically connected to one sub-air passage 13, and the nozzle hole 16 is vertically connected to the other sub-air passage 13. In this way, the processing of the air passage 13 can be completed by directly drilling holes into the interior of the air cushion 1 through the first threaded hole 15 and the nozzle hole 16.

[0035] Of course, in some other embodiments, the air cushion 1 can also be designed in other shapes, such as a hexagonal shape, etc., and can be specifically designed according to actual needs.

[0036] The present application also provides an air bearing assembly, which includes the aforementioned air cushion 1 and a rocking pair arranged in the mounting hole 17. Among them, the rocking pair can be realized by using the rocking pair in the prior art or can be realized by using different technical solutions as Figures 4 to 9 shown.

[0037] Figure 4 and Figure 5The first embodiment of an air bearing assembly is shown. In this embodiment, the rocking pair 2 includes a load-bearing column 20, a retaining ring 21, a support rod 22, and a wire retaining ring 23. A coaxial tapered pit 200 is formed by the load-bearing column 20 being recessed downward from the center of the top surface. A slot hole 201 that is coaxial with the tapered pit 200 and penetrates the bottom surface of the load-bearing column 20 is formed at the small-diameter end of the tapered pit 200. The retaining ring 21 is fixedly sleeved in the slot hole 201, and a first annular groove 210 is provided on the inner wall surface of the retaining ring 21. The support rod 22 includes a stud 220, a polyhedron 221 provided at one end of the stud 220, and a spherical socket portion provided at the other end of the stud 220. The spherical socket portion includes a spherical portion and a socket column 224. The spherical portion includes a first column 222 connected to the stud 220 and a hollow spherical table 223 fixedly sleeved on the first column 222. The spherical surface of the hollow spherical table 223 is in movable contact with the inner wall surface of the tapered pit 200. The socket column 224 is connected to the other end of the first column 222 and is mated and sleeved in the retaining ring 21. A second annular groove 2240 is formed at the position corresponding to the first annular groove 210 on the outer wall surface of the socket column 224. When the socket column 224 is fixedly sleeved in the retaining ring 21, there is a first movable gap 240 between the bottom surface of the socket column 224 and the bottom surface of the retaining ring 21, and there is a second movable gap 241 between the retaining ring 21 and the bottom surface of the spherical portion. The wire retaining ring 23 is disposed in the accommodation cavity formed by the first annular groove 210 and the second annular groove 2240 to achieve the fixed sleeving of the retaining ring 21 and the socket column 224.

[0038] When in use, as Figure 4 and Figure 5 shown, the load-bearing column 20 in the rocking pair 2 is fixedly installed in the mounting hole 17 of the air cushion 1, the retaining ring 21 is fixedly installed in the load-bearing column 20, the spherical surface of the hollow spherical table 223 fixed on the support rod 22 is in movable contact with the inner wall surface of the tapered pit 200, the socket column 224 on the support rod 22 is sleeved and fixed in the retaining ring 21 in the load-bearing column 20, there is a first movable gap 240 between the bottom surface of the socket column 224 and the bottom surface of the retaining ring 21, and there is a second movable gap 241 between the retaining ring 21 and the bottom surface of the spherical portion. At this time, the hollow spherical table 223 can swing freely relative to the tapered pit 200 to achieve the purpose of the rocking pair 2. During operation, when the air cushion 1 swings due to the influence of the contact surface or other factors, the rocking pair 2 will swing to adjust the position of the air cushion 1 to make the air cushion 1 stable, so that the air bearing assembly can work properly.

[0039] In this embodiment, the load-bearing column 20 and the support rod 22 are usually made of high-quality carbon steel. After heat treatment or surface treatment, the surfaces of the cone pit 200 and the hollow ball table 223 have high precision, strength and hardness. In this way, the load-bearing column 20 and the hollow ball table 223 are not prone to wear or cracking after long-term contact, swinging and friction, and the service life of the rocking pair 2 is longer.

[0040] In this embodiment, the hollow ball table 223 is usually fixedly sleeved on the first column 222 by means of interference fit or glue bonding.

[0041] In addition, in order to facilitate the fixed sleeve connection of the sleeve column 224 in the retaining ring 21, as shown in FIG. Figure 3 and Figure 4 As shown, in this embodiment, a first chamfer 2241 is provided at the corner of the bottom end surface of the sleeve column 224. When sleeved, the wire retaining ring 23 is first placed in the first annular groove 210, and then the sleeve column 224 is inserted into the retaining ring 21. At this time, the wire retaining ring 23 will pass through the first chamfer 2241 and enter the accommodating cavity formed by the first annular groove 210 and the second annular groove 2240. In this way, the sleeve column 224 and the retaining ring 21 are fixed, and the support rod 22 and the load-bearing column 20 can be fixed.

[0042] In order to facilitate the removal of the sleeve column 224 from the retaining ring 21, Figure 4 and Figure 5 As shown, in this embodiment, a second chamfer 2242 is provided at a side corner position of the second annular groove 2240 near the bottom end surface of the sleeve column 224. When disassembling, the sleeve column 224 is pulled out of the retaining ring 21 by force, and at this time, the wire retaining ring 23 will be released from the accommodating cavity formed by the first annular groove 210 and the second annular groove 2240 through the second chamfer 2242, so that the sleeve column 224 can be pulled out of the retaining ring 21, and the support rod 22 and the bearing column 20 can be disassembled and separated.

[0043] In this embodiment, if Figure 4 As shown, the wire retaining ring 23 is usually an open wire retaining ring to facilitate disassembly and assembly.

[0044] In this embodiment, if Figure 4 As shown, the bearing column 20 and the retaining ring 21 are both cylindrical, and the retaining ring 21 can be fixedly sleeved in the slot 201 in the bearing column 20 by interference fit or glue bonding. Of course, in some other embodiments, the bearing column 20 and the retaining ring 21 can be designed into other shapes, for example, the bearing column 20 can be designed into a polygonal column such as a quadrangular column or a hexagonal column, and the slot 201 in the bearing column 20 can be designed into a polygonal hole, and the structure of the retaining ring 21 can be designed accordingly.

[0045] In this embodiment, as Figure 4 shown, the inner hole of the retaining ring 21 is a circular hole, and the socket column 224 is correspondingly designed to be cylindrical.

[0046] In this embodiment, as Figure 4 shown, the first column 222 is designed to be cylindrical. Correspondingly, the inner hole of the hollow spherical frustum 223 is a cylindrical hole. Of course, in some other embodiments, the first column 222 can be designed into other column shapes, such as a quadrangular prism or a hexagonal prism. At this time, the inner hole of the hollow spherical frustum 223 is correspondingly opened to be fixedly sleeved on the first column 222.

[0047] In this application, the polyhedron 221 is mainly used to rotate the support rod 22 when installing the rocking pair 2 to fix the rocking pair 2 at a corresponding position, which is equivalent to the function of a screw head. As Figure 4 shown, in this embodiment, the polyhedron 221 is a hollow hexahedron. Of course, in some other embodiments, the polyhedron 221 can be designed into other shapes, and during disassembly and assembly, it can be rotated using a corresponding installation tool for disassembly or installation.

[0048] Figure 6 And Figure 7 shows a second embodiment of the air bearing assembly. In this embodiment, the rocking pair 3 includes a load-bearing column 30, a retaining ring 31, a support rod 32, and a wire retaining ring 33. A coaxial tapered pit 300 is formed by the load-bearing column 30 recessing downward from the center of the top surface. A slot hole 301 coaxial with the tapered pit 300 and penetrating the bottom surface of the load-bearing column 30 is formed at the small-diameter end of the tapered pit 300; the retaining ring 31 is fixedly sleeved in the slot hole 301, and a first annular groove 310 is provided on the inner wall surface of the retaining ring 31; the support rod 32 includes a stud 320, a polyhedron 321 provided at one end of the stud 320, and a spherical socket portion provided at the other end of the stud 320. The spherical socket portion includes a spherical frustum portion and a socket column 323. The spherical frustum portion includes a solid spherical frustum 322 connected to the stud 320. The spherical surface of the solid spherical frustum 322 is in movable contact with the inner wall surface of the tapered pit 300. The socket column 323 is connected to the other end of the solid spherical frustum 322 and is fitted and sleeved in the retaining ring 31. A second annular groove 3230 is formed at a position corresponding to the first annular groove 310 on the outer wall surface of the socket column 323. When the socket column 323 is fixedly sleeved in the retaining ring 31, there is a first movable gap 340 between the bottom surface of the socket column 323 and the bottom surface of the retaining ring 31, and there is a second movable gap 341 between the retaining ring 31 and the bottom surface of the spherical frustum portion; the wire retaining ring 33 is disposed in the accommodation cavity formed by the first annular groove 310 and the second annular groove 3230 to realize the fixed socketing of the retaining ring 31 and the support rod 32. Among them, the connection and working process of the rocking pair 3 and the air cushion can be referred to the foregoing description and will not be elaborated here.

[0049] Similar to the first embodiment, in this embodiment, the load-bearing column 30 and the support rod 32 are generally made of high-quality carbon steel. After heat treatment or surface treatment, the surfaces of the conical pits 300 and the solid ball tables 322 have high precision, strength, and hardness. In this way, the load-bearing column 30 is not easily worn or cracked after long-term contact and swinging friction with the solid ball table 322, resulting in a long service life of the rocking pair 3.

[0050] Similar to the first embodiment, for the convenience of fixedly sleeving the socket column 323 into the retaining ring 31 and removing the socket column 323 from the retaining ring 31, as Figure 6 and Figure 7 shown, a first chamfer 3231 is provided at the corner of the bottom end surface of the socket column 323, and a second chamfer 3232 is provided at the corner position on one side close to the bottom end surface of the socket column 323 on the second annular groove 3230. The sleeving and disassembly processes can refer to the description in the first embodiment and will not be elaborated here.

[0051] Of course, in some other embodiments, only a first chamfer 3231 may be provided at the corner of the bottom end surface of the socket column 323. In this way, the support rod 32 and the load-bearing column 30 can be used in long-term cooperation.

[0052] In this embodiment, as Figure 6 shown, the wire retaining ring 33 is usually an open wire retaining ring for convenient disassembly and assembly.

[0053] In this embodiment, as Figure 6 shown, the load-bearing column 30 and the retaining ring 31 are both cylindrical. The retaining ring 31 can be fixedly sleeved into the slot hole 301 in the load-bearing column 30 by interference fit or glue bonding, etc. Of course, in some other embodiments, the load-bearing column 30 and the retaining ring 31 can be designed into other shapes. For example, the load-bearing column 30 can be designed into a multi-sided column such as a quadrangular prism or a hexagonal prism. And the slot hole 301 in the load-bearing column 30 can be designed into a multi-sided hole shape, and the structure of the retaining ring 31 can be designed accordingly at this time.

[0054] In this embodiment, as Figure 6 shown, the inner hole of the retaining ring 31 is a circular hole, and the socket column 323 is correspondingly designed to be cylindrical.

[0055] Figure 8 and Figure 9The third embodiment of the air bearing assembly is shown. In this embodiment, the rocking pair 4 includes a load-bearing column 40, a retaining ring 41, a support rod 42, and a wire retaining ring 43. A coaxial tapered pit 400 is formed by the load-bearing column 40 being recessed downward from the center of the top surface. A slot hole 401 that is coaxial with the tapered pit 400 and penetrates the bottom surface of the load-bearing column 40 is formed at the small-diameter end of the tapered pit 400. The retaining ring 41 is fixedly sleeved in the slot hole 401, and a first annular groove 410 is provided on the inner wall surface of the retaining ring 41. The support rod 42 includes a stud 420, a polyhedron 421 provided at one end of the stud 420, and a spherical socket portion provided at the other end of the stud 420. The spherical socket portion includes a spherical portion and a socket column 424. The spherical portion includes a second column body 422 connected to the stud 420 and a hemispherical table 423 provided at the other end of the second column body 422. The spherical surface of the hemispherical table 423 is in movable contact with the inner wall surface of the tapered pit 400. The socket column 424 is connected to the other end of the hemispherical table 423 and is fitted and sleeved in the retaining ring 41. A second annular groove 4240 is formed at a position corresponding to the first annular groove 410 on the outer wall surface of the socket column 424. When the socket column 424 is fixedly sleeved in the retaining ring 41, there is a first movable gap 440 between the bottom surface of the socket column 424 and the bottom surface of the retaining ring 41, and there is a second movable gap 441 between the retaining ring 41 and the bottom surface of the spherical portion. The wire retaining ring 43 is arranged in the accommodation cavity formed by the first annular groove 410 and the second annular groove 4240 to realize the fixed socket connection between the retaining ring 41 and the support rod 42. Among them, the connection and working process of the rocking pair 4 and the air cushion can be referred to the foregoing description and will not be elaborated here.

[0056] Similar to the first embodiment, in this embodiment, the load-bearing column 40 and the support rod 42 are usually made of high-quality carbon steel. After heat treatment or surface treatment, the surfaces of the tapered pit 400 and the hemispherical table 423 have high precision, strength, and hardness. In this way, the load-bearing column 40 and the hemispherical table 423 are not easily worn or cracked after long-term contact and swinging friction, so that the rocking pair 4 has a long service life.

[0057] Similar to the first embodiment, in order to facilitate fixedly sleeving the socket column 424 into the retaining ring 41 and facilitating taking out the socket column 424 from the retaining ring 41, as Figure 8 and Figure 9 shown, a first chamfer 4241 is provided at the corner of the bottom end surface of the socket column 424, and a second chamfer 4242 is provided at a position of the side corner near the bottom end surface of the socket column 424 on the second annular groove 4240. The sleeving and disassembly process can be referred to the description in the first embodiment and will not be elaborated here.

[0058] Of course, in some other embodiments, only a first chamfer 4241 may be provided at the corner of the bottom end surface of the socket column 424. In this way, the support rod 42 and the load-bearing column 40 can be used in long-term cooperation.

[0059] In this embodiment, as Figure 8 shown, the wire snap ring 43 is usually an open wire snap ring to facilitate disassembly and assembly.

[0060] In this embodiment, as Figure 8 shown, the load-bearing column 40 and the snap ring 41 are both cylindrical. The snap ring 41 can be fixedly sleeved in the slot 401 in the load-bearing column 40 by means of interference fit or glue bonding.

[0061] Of course, in some other embodiments, the load-bearing column 40 and the snap ring 41 can be designed into other shapes. For example, the load-bearing column 40 can be designed into a polygonal column such as a quadrangular prism or a hexagonal prism. And the slot 401 in the load-bearing column 40 can be designed into a polygonal hole shape, and at this time, the structure of the snap ring 41 can be designed accordingly.

[0062] In this embodiment, as Figure 8 shown, the inner hole of the snap ring 41 is a circular hole, and the socket column 424 is correspondingly designed into a cylindrical shape.

[0063] In this embodiment, as Figure 8 shown, the second column 422 is designed into a cylindrical shape. Of course, in some other embodiments, the second column 422 can be designed into other column shapes, such as a quadrangular prism or a hexagonal prism.

[0064] In the solution of the present invention, the throttle holes 11, air cavities 12, etc. in the air cushion 1 are directly formed on the working surface of the air cushion 1, and can be integrally formed by machining in a machining center. The structure is stable. There is no need to design assembly structures such as mounting holes, short round tubes, and ruby bearings, that is, there is no need for additional assembly of components, and problems such as cracking of the hard anodized layer around the mounting hole 17, irregular shape of the air cavity 12, and air vibration caused by assembly defects of short round tubes and ruby bearings will not occur, and the production is simple and convenient.

[0065] The above preferred embodiments should be regarded as illustrative examples of the implementation modes of the present application. All technical deductions, substitutions, improvements, etc. that are identical, similar to or based on the present application should be regarded as within the protection scope of this patent.

Claims

1. An air bearing assembly, characterized in that, It includes an air cushion and a rocking pair arranged in the mounting hole; A pressure equalizing groove, a plurality of throttle holes and a plurality of air cavities are provided on the working surface of the air cushion. The pressure equalizing groove is recessed downward from the working surface of the air cushion. The throttle holes are distributed on the pressure equalizing groove. The air cavities are correspondingly arranged at the positions of the throttle holes and are coaxial with the throttle holes. An air passage is provided in the air cushion. An air hole for communicating the air passage with the throttle hole is provided at the position corresponding to the throttle hole on the air passage. The inner diameter of the air hole is larger than the inner diameter of the throttle hole. At least one first threaded hole for installing a plug and a nozzle hole for installing a nozzle and communicating with the air passage are provided on the side surface of the air cushion. An installation hole for installing a rocking pair is provided at the center position of the back surface of the air cushion; The rocking pair includes a bearing column, a retaining ring, a support rod and a wire retaining ring. A coaxial conical pit is formed by recessing the bearing column downward from the center of the top surface. A slot hole coaxial with the conical pit and penetrating the bottom surface of the bearing column is formed at the small diameter end of the conical pit. The retaining ring is fixedly sleeved in the slot hole, and a first annular groove is provided on the inner wall surface of the retaining ring. The support rod includes a stud, a polyhedron provided at one end of the stud and a spherical socket portion provided at the other end of the stud. The spherical socket portion includes a spherical table portion connected to the stud and in movable contact with the inner wall surface of the conical pit and a socket column connected to the spherical table portion and fittingly sleeved in the retaining ring. A second annular groove is formed on the outer wall surface of the socket column corresponding to the position of the first annular groove. When the socket column is fixedly sleeved in the retaining ring, there is a first movable gap between the bottom surface of the socket column and the bottom surface of the retaining ring, and a second movable gap between the retaining ring and the bottom surface of the spherical table portion. The wire retaining ring is arranged in the accommodating cavity formed by the first annular groove and the second annular groove to realize the fixed sleeving of the retaining ring and the support rod.

2. The air bearing assembly according to claim 1, characterized in that, A second threaded hole communicating with the air hole is further provided on the back surface of the air cushion corresponding to the position of the air hole.

3. The air bearing assembly according to claim 2, characterized in that, The depth of the pressure equalizing groove is lower than or equal to the depth of the air cavity.

4. The air bearing assembly according to claim 3, characterized in that, The air cushion is in a cuboid shape. The pressure equalizing groove includes four pressure dividing grooves parallel to the four sides on the working surface of the air cushion and perpendicular to each other. Four throttle holes and four air cavities are provided on the air cushion. The throttle holes are respectively arranged at the intersection centers of the pressure dividing grooves, and the air cavities are respectively arranged at the intersection positions of the pressure dividing grooves. The air passage is formed by enclosing four branch air passages into a rectangular cavity shape. The first threaded hole and the nozzle hole are both vertically penetrated with the branch air passages, and the second threaded hole is vertically penetrated with the air hole.

5. The air bearing assembly according to any one of claims 1-4, characterized in that, The spherical table portion includes a first column body connected to the stud and a hollow spherical table fixedly sleeved on the first column body. The spherical surface of the hollow spherical table is in movable contact with the inner wall surface of the conical pit.

6. The air bearing assembly according to any one of claims 1-4, characterized in that, The spherical table portion includes a solid spherical table connected to the stud. The spherical surface of the solid spherical table is in movable contact with the inner wall surface of the conical pit.

7. The air bearing assembly according to any one of claims 1-4, characterized in that, The table portion includes a second cylinder connected by the stud and a hemispherical table provided at the other end of the second cylinder, and the spherical surface of the hemispherical table is in movable contact with the inner wall surface of the conical pit.

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