A pore structure supported by air floatation

Abstract

The present invention discloses an air pore structure for an air flotation support. The air flotation platform, disposed within the air flotation support, comprises an air inlet, a throttle hole, and a pressure-bearing chamber. The pressure-bearing chamber is a conical cavity with a conical rotating surface inside. The conical rotating surface's smallest diameter end is connected to the throttle hole. This invention improves the stability of the air film flow field formed by the air flotation support and offers the advantage of easy replacement.

Description

Technical Field

[0001] The invention relates to the field of air floating support, in particular to an air pore structure of an air floating support. Background Art

[0002] In static pressure air bearing systems, a pressure chamber is typically located behind a throttle (orifice) to improve the system's load-bearing capacity. The size of the throttle (orifice parameters), as well as the shape and volume of the pressure chamber, significantly influence the performance of the air bearing system. In air bearing and conveying systems, carrying workpieces of varying materials, sizes, and weights often requires the design of pressure chambers with varying shapes and volumes, as well as throttles (orifices) with varying structural dimensions, to ensure the air bearing system achieves the desired performance and stability.

[0003] like Figure 1 As shown, the traditional air floating support includes an air floating platform 01, and a number of air holes are arranged through the air floating platform 01, some of which serve as air inlets and the rest as air outlets. Each air hole includes an air port 02, a throttle hole 03, and a pressure chamber 04 in the axial direction, among which the throttle hole 03 has the smallest diameter and connects the air port 02 and the pressure chamber 04. The pressure chamber 04 is generally set as a cylindrical countersunk hole on the surface of the air flotation platform 01. The air flow enters the throttle hole 03 from the air inlet 02, and then sprays toward the pressure chamber 04 from the throttle hole 03. When the air flow is ejected from the throttle hole 03, due to the sudden expansion of the pipeline, the air flow generates a separated flow in the pressure chamber 04, and a low-pressure area is formed on the outside of the bottom of the cylindrical countersunk hole (pressure chamber 04). The low-pressure area attracts the gas at the bottom of the air film 05 to flow back to the outside of the bottom 04 of the pressure chamber to form a vortex flow, which will make the air film flow field unstable, and thus cause the stability of the floating body 06 supported by the air flotation above the air flotation platform 01 to deteriorate.

[0004] Furthermore, in production, switching between different products is a common occurrence. Therefore, air support and conveying equipment often requires parameter adjustments or even replacement of components such as the air float plate to accommodate the varying product requirements. In existing air support and conveying systems, the pressure chamber is typically located on the air float plate. Changing the pressure chamber requires replacing the air float plate, a cumbersome and costly process. Summary of the Invention

[0005] The purpose of the present invention is to provide an air-floating support pore structure to solve the problem that the air-floating support pore pressure-bearing cavity in the prior art easily causes air film instability.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A pore structure of an air flotation support is provided on an air flotation platform in the air flotation support, comprising an air port, a throttle hole, and a pressure-bearing chamber. One end of the throttle hole is connected to the air port, and the other end of the throttle hole is connected to the pressure-bearing chamber. The pressure-bearing chamber is a conical chamber, and the rotating surface inside the conical chamber includes a conical rotating surface. The end with the smallest diameter of the conical rotating surface is connected to the throttle hole.

[0008] Furthermore, it also includes a plug body, the air port, the throttle hole, and the pressure-bearing cavity are respectively arranged in the plug body, the air flotation platform is provided with a mounting through hole, and the plug body is assembled in the mounting through hole of the air flotation platform.

[0009] Furthermore, the air port in the plug body is configured as a non-circular countersunk hole.

[0010] Furthermore, the outer contour of the plug body is provided with a stepped annular surface, and the mounting through hole of the air floating platform is provided with a stepped portion, and the stepped annular surface of the plug body cooperates with the stepped portion of the mounting through hole to achieve positioning.

[0011] Furthermore, the cone angle of the conical rotating surface is designed according to the jet diffusion angle.

[0012] Furthermore, the rotating surface inside the conical cavity also includes a multi-step rotating surface and a cylindrical rotating surface, wherein the smallest diameter end of the multi-step rotating surface is connected to the largest diameter end of the conical rotating surface, and the largest diameter end of the multi-step rotating surface is connected to one end of the cylindrical rotating surface.

[0013] Furthermore, the inclination angle of the conical rotating surface is equal to the jet diffusion angle, which reduces the space inside the pressure chamber where vortex flow is easily formed.

[0014] In the air-floating support pore of the present invention, the pressure-bearing cavity is a conical cavity, and the internal rotating surface of the conical cavity adopts a conical rotating surface, which can reduce or avoid the backflow of gas in the bottom layer of the air film and improve the stability of the air film flow field.

[0015] In the air-floating support air hole of the present invention, the pressure chamber can also adopt a combined rotating surface composed of a conical rotating surface, a multi-step rotating surface, and a cylindrical rotating surface. The conical rotating surface can reduce the backflow of gas in the bottom layer of the air film, and the multi-step rotating surface can reduce the size of the vortex generated when the gas in the bottom layer of the air film flows back, thereby improving the stability of the air film flow field.

[0016] The air holes of the air floating support of the present invention are arranged in a plug body, and the plug body is assembled on the air floating platform and is detachable, so the air holes can be easily replaced, thereby reducing the maintenance cost of the air floating support. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front cross-sectional view of the air-floating support pore structure in the prior art.

[0018] Figure 2It is a front cross-sectional view of the structure of embodiment 1 of the present invention.

[0019] Figure 3 It is a front cross-sectional view of the structure of embodiment 2 of the present invention.

[0020] Figure 4 It is a front cross-sectional view of the structure of embodiment 3 of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Example 1

[0023] like Figure 2 As shown, this embodiment includes a cylindrical plug body 07, the outer diameter of the lower section of the plug body 07 is larger than the outer diameter of the upper section of the plug body 07, thereby forming a stepped annular surface in the middle of the plug body 07, and the outer circular surface of the lower section of the plug body 07 is provided with a thread. The plug body 07 is provided with air holes, and the air holes include, from bottom to top, an air port 02, a throttling hole 03, and a pressure-bearing chamber 04. The pressure-bearing chamber 04 is a conical chamber that is thicker at the top and thinner at the bottom, that is, the rotating surface inside the pressure-bearing chamber 04 is a conical rotating surface. The throttling hole is a small hole throttling structure, or a capillary throttling structure, or a porous throttling structure. The lower end of the throttling hole 03 is connected to the air port 02, and the upper end of the throttling hole 03 is connected to the lower end of the pressure-bearing chamber 04 with the smallest diameter. The upper end of the pressure-bearing chamber 04 with the largest diameter is located on the top surface of the plug body 07.

[0024] In this embodiment, the plug body 07 is mounted on an air-floating platform 01 supported by air flotation. Specifically, a mounting hole 08 is vertically provided through the air flotation platform 01. The diameter of the lower section of the mounting hole 08 is larger than the diameter of the upper section, thereby forming a step in the middle of the mounting hole 08. The lower section of the mounting hole 08 is also threaded. The plug body 07 is threadedly mounted in the mounting hole 08 of the air flotation platform 01. The outer cylindrical surface of the upper section of the plug body 07 serves as a positioning stop cylindrical surface 071, which is positioned and engaged with the inner wall of the upper section of the mounting hole 08. The top end surface of the lower section of the plug body 07 serves as a stop end surface 072, which is positioned and engaged with the top of the lower section of the mounting hole 08. This ensures that the plug body 07 is positioned and removably assembled in the mounting hole 08.

[0025] In this embodiment, airflow V1 enters the conical pressure chamber 04 through the throttle hole 03. The airflow through the throttle hole 03 is a typical jet flow, which, through viscous forces, drives the surrounding fluid to form a boundary layer V2. The jet diffusion angle B is the angle between the boundary layer V2 and the central axis. The conical pressure chamber 04 has a cone angle A set to be equal to the jet diffusion angle B. This reduces or prevents gas backflow at the bottom of the air film by minimizing the presence of low-pressure areas.

[0026] In this embodiment, the air port 02 in the plug body 07 is set as a hexagonal countersunk hole. Using an appropriate size hexagonal wrench inserted into the hexagonal countersunk hole, the plug body can be rotated to achieve the purpose of adjusting the height of the throttle plug and facilitating replacement.

[0027] Example 2

[0028] This embodiment is a further improvement on the conical pressure-bearing chamber in the first embodiment, so as to increase the ability to cope with the requirements of air flotation transportation in various working conditions.

[0029] like Figure 3 As shown, except for the pressure-bearing chamber 04, the rest of the structure of this embodiment is the same as that of the first embodiment. The pressure-bearing chamber 04 of this embodiment is also a conical chamber, but it differs from the first embodiment in that the rotating surface inside the pressure-bearing chamber 04 of this embodiment includes, in axial order, a conical rotating surface 041 in the lower section, a multi-step rotating surface 042 in the middle section, and a cylindrical rotating surface 043 in the upper section. The multi-step rotating surface 042 is composed of multiple circular rotating surfaces that expand in diameter from bottom to top, with steps formed between adjacent stages. The lower end of the conical rotating surface 041 with the smallest diameter is connected to the upper end of the throttle hole 03, the upper end of the conical rotating surface 041 with the largest diameter is connected to the lower end of the multi-step rotating surface 042, the upper end of the multi-step rotating surface 042 is connected to the lower end of the cylindrical rotating surface 043, and the upper end of the cylindrical rotating surface 043 is arranged on the top surface of the plug body 07.

[0030] This embodiment and Figure 1 Compared with the pressure chamber of the prior art air bearing shown, it has a smaller volume, which is conducive to improving stability. In this embodiment, the upper part of the internal rotating surface of the pressure chamber 04 is set as a cylindrical rotating surface 043, which has a larger area, which is conducive to improving the bearing capacity.

[0031] In addition, in the rotating surface inside the pressure chamber 04 of this embodiment, first, the inclination angle of the conical rotating surface 041 is designed with reference to the principle of the vortex-free pressure chamber; secondly, since the air flow velocity at the multi-step rotating surface 042 is smaller than that at the outlet of the throttle hole 03, the negative pressure degree in this area is greater than that in the throttle hole 03. Figure 1 The negative pressure in the pressure chamber of the prior art air-floating support shown is small, and the vortex intensity formed thereby is also small; thirdly, in the multi-step rotating surface 042, even if there is a vortex generated by the gas backflow at the bottom of the air film, its vortex scale is smaller than Figure 1 The vortex size formed by the prior art air-floating support shown is also much smaller, and the impact on the stability of the air film is also much smaller.

[0032] In this embodiment, by designing the rotating body busbar with different lengths and widths of the multi-step rotating surface 042, the shape and volume of the air hole can be changed to meet the needs of carrying workpieces of different materials, sizes, and weights.

[0033] Example 3

[0034] like Figure 4This embodiment illustrates the application of an air-floating support having the pore structure of the present invention to a glass substrate. A glass substrate 09 is positioned above the air-floating platform 01 of the air-floating support. The bottoms of the glass substrate are secured by suction cups 100 on either side, which are fixed to the slide of a guide rail mechanism 101.

[0035] During operation, a steady flow of positive-pressure air enters the air port 02 in the air hole, which serves as the air inlet. The air then flows through the throttle hole 03 and the pressure chamber 04 into the gap between the glass substrate 09 and the air flotation platform 01. A portion of the air is drawn away by negative-pressure suction in the air hole, which serves as the air outlet. The remaining portion flows out of the gap and into the surrounding atmosphere. As the air flows through the gap between the glass substrate 100 and the air flotation platform 01, it forms a rigid, supportive air film, which lifts the glass substrate 09 to a certain height. The slide in the linear motion guide rail slide mechanism 101, driven by the suction cup 100, propels the glass substrate 09 along the air film, parallel to the air flotation platform 01.

[0036] Applying the air-bearing support with the pore structure proposed in Examples 1 and 2 of the present invention to the air-bearing transport of large glass substrates can effectively reduce the instability caused by vortices within the pressure chamber. When the glass substrate supported by the air-bearing support is replaced and increased vibration of the glass substrate is detected, the plug of the pressure chamber with the appropriate combination of rotating surfaces can be replaced to ensure that the vibration amplitude of the glass substrate meets the stability requirements of air-bearing transport.

[0037] The embodiments described in the present invention are merely descriptions of the preferred implementation methods of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the scope of protection of the present invention. The technical contents for which protection is sought in the present invention have all been recorded in the claims.

Claims

1. An air-hole structure of an air-floating support, an air-floating platform provided in the air-floating support, comprising an air port, a throttle hole, and a pressure-bearing chamber, wherein one end of the throttle hole is connected to the air port, and the other end of the throttle hole is connected to the pressure-bearing chamber, characterized in that: The pressure-bearing cavity is a conical cavity, the revolving surface inside the conical cavity includes a conical revolving surface, and the end with the smallest diameter of the conical revolving surface is connected to the throttling hole; The air-floating supported air hole structure is characterized in that it further comprises a plug body, wherein the air port, the throttle hole, and the pressure-bearing cavity are respectively provided in the plug body, the air-floating platform is provided with a mounting through hole, and the plug body is assembled in the mounting through hole of the air-floating platform; The air port in the plug body is configured as a non-circular countersunk hole; The outer contour of the plug body is provided with a stepped annular surface, and the mounting through hole of the air flotation platform is provided with a stepped portion, and the stepped annular surface of the plug body cooperates with the stepped portion of the mounting through hole to achieve positioning; The revolving surface inside the conical cavity further comprises a multi-step revolving surface and a cylindrical revolving surface, wherein the smallest diameter end of the multi-step revolving surface is connected to the largest diameter end of the conical revolving surface, and the largest diameter end of the multi-step revolving surface is connected to one end of the cylindrical revolving surface; The inclination angle of the conical rotating surface is equal to the jet diffusion angle, and the space inside the pressure chamber that is prone to form vortex flow is eliminated, making it difficult for cyclones to be generated in the pressure chamber.

2. The air-supported pore structure according to claim 1, characterized in that: The cone angle of the conical rotating surface is designed according to the jet diffusion angle.

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