Air floatation clamping structure, drilling mechanism and drilling equipment

Abstract

The utility model discloses an air floatation embracing clamp structure, drilling mechanism and drilling equipment, including embracing clamp body and shell, the embracing clamp body is equipped with the air floatation axle hole that runs through along the axial direction, the shell is sleeved on the periphery of embracing clamp body, the shell and the outer wall surface of embracing clamp body form the annular air chamber, the annular air chamber is equipped with the air floatation axle hole, and the air floatation axle hole is communicated with the air floatation axle hole. The holding clamp body and / or the shell are / is provided with an air inlet communicated with the annular air cavity, the holding clamp body is provided with multiple rows of radial holes distributed in the circumferential direction, the radial holes form an air inlet end on the outer wall face of the holding clamp body, and the radial holes form an air outlet end on the hole wall of the air floating shaft hole. The hole diameter of the air inlet end of the radial hole is larger than that of the air outlet end of the radial hole, and the hole diameter of the air outlet end of the radial hole is not larger than 0.1 mm. The hole diameter of the air outlet end of the radial hole is not larger than 0.1 mm, a micropore throttling structure is formed, compared with small hole throttling, micropore throttling can greatly improve the rigidity of the air bearing, and consumed air flow is smaller.

Description

Technical Field

[0001] The utility model is used in the field of drilling equipment, in particular to an air-floating clamping structure, a drilling mechanism and drilling equipment. Background Art

[0002] PCB mechanical drilling machines are mainstream processing equipment in the PCB drilling industry, offering excellent drilling accuracy and efficiency. With the transformation of the PCB industry's product mix, the proportion of high-tech products such as HDI boards, flexible boards, and package carriers has increased annually. These boards require higher density and precision of small holes. Consequently, the processing speed of PCB mechanical drilling machines has reached 200,000 rpm, and can even reach 360,000 rpm. To meet the demands of high-speed processing, drilling machines use an air-floating clamping mechanism on the Z-axis to improve drilling efficiency and accuracy. However, existing air-floating clamping mechanisms have limited rigidity and consume a large amount of air. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide an air-floating clamping structure, a drilling mechanism and a drilling device.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] In the first aspect, an air-floating clamping structure includes a clamping body and an outer shell, the clamping body is provided with an air-floating shaft hole extending axially therethrough, the outer shell is sleeved on the outer circumference of the clamping body, an annular air cavity is formed between the outer shell and the outer wall surface of the clamping body, the clamping body and / or the outer shell is provided with an air inlet connected to the annular air cavity, the clamping body is provided with multiple rows of radial holes distributed along the circumferential direction, the radial holes form an air inlet end on the outer wall surface of the clamping body, the radial holes form an air outlet end on the hole wall of the air-floating shaft hole, the aperture of the air inlet end of the radial hole is larger than the aperture of the air outlet end, and the aperture of the air outlet end of the radial hole is not greater than 0.1 mm.

[0006] In combination with the first aspect, in certain implementations of the first aspect, a plurality of annular grooves are provided on the wall of the air-floating shaft hole, and the annular grooves are communicated with the air outlet ends of each row of the radial holes.

[0007] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the hole wall of the air-floating shaft hole is provided with an air-avoiding groove, the interior of the clamp body is provided with an exhaust channel, the exhaust channel is connected to the air-avoiding groove, and the clamp body and / or the outer shell is provided with an exhaust port connected to the exhaust channel.

[0008] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the end of the clamping body is provided with a flange structure, the exhaust port and the air inlet are arranged on the outer circumferential surface of the flange structure, and the air inlet is provided with an air inlet connector.

[0009] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the flange structure has a flange surface perpendicular to the axial direction of the air floating shaft hole, and a plurality of waist-shaped grooves are formed in the flange surface.

[0010] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the shell is sleeved on the clamping body away from the flange structure, the shell is fixed to the clamping body by a snap spring away from the flange structure, sealing rings are arranged between the shell and the clamping body at both ends of the annular air cavity, and the shell and / or the clamping body is / are provided with a sealing ring groove in which the sealing ring is arranged.

[0011] With reference to the first aspect and the above implementation manners, in some implementation manners of the first aspect, the hole wall of the air floating shaft hole is provided with a wear-resistant insulation layer.

[0012] The second aspect relates to an air floating clamping structure, which comprises a clamping body and a shell, the clamping body is provided with an air floating shaft hole penetrating in the axial direction, the shell is sleeved on the outer circumferential surface of the clamping body, an annular air cavity is formed between the shell and the outer wall surface of the clamping body, the clamping body and / or the shell is / are provided with an air inlet communicating with the annular air cavity, the clamping body is provided with a plurality of rows of radial holes distributed in the circumferential direction, the radial holes form an air inlet end on the outer wall surface of the clamping body, the radial holes form an air outlet end on the hole wall of the air floating shaft hole, the air outlet end is provided with a micropore throttler, and the micropore throttler is provided with a plurality of micropores not greater than 0.1 mm.

[0013] The third aspect relates to a drilling mechanism, which comprises an electric spindle and the air floating clamping structure according to any one of the implementation manners of the first aspect or the second aspect, and the electric spindle is arranged in the air floating shaft hole.

[0014] The fourth aspect relates to a drilling device, which comprises the drilling mechanism according to the third aspect.

[0015] One of the above technical solutions has at least one of the following advantages or beneficial effects: In the technical solution of the present invention, the air-floating clamping structure can be used to guide and support the electric spindle of drilling equipment. During operation, the electric spindle is inserted into the air-floating shaft hole. Through external air supply, the gas enters the annular air cavity between the clamp body and the outer shell from the air inlet. Then, the high-pressure gas evenly passes through multiple rows of radial holes, forming a high-pressure air film between the electric spindle and the clamp body, so that the electric spindle and the clamp body are suspended without contact, and the electric spindle can slide flexibly along its axis. In the present invention, by making the aperture of the air outlet end of the radial hole no larger than 0.1mm, a micro-pore throttling structure is formed. Compared with small-hole throttling, micro-pore throttling can greatly improve the stiffness of the air-floating bearing and consume less air volume.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a structural diagram of an embodiment of the drilling mechanism of the utility model;

[0019] Figure 2 This is a schematic structural diagram of an embodiment of the air-floating clamping structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the air intake structure of an embodiment of the air-floating clamping structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the air outlet structure of an embodiment of the air-floating clamping structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the radial hole structure of an embodiment of the air-floating clamping structure of the utility model;

[0023] Figure 6 This is a schematic diagram of the microporous restrictor structure of another embodiment of the air-floating clamping structure of the utility model;

[0024] Figure 7 It is a top view of an embodiment of the air-floating clamping structure of the present utility model. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0026] In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0027] In this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of this utility model, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0029] See also Figure 1-Figure 5 An embodiment of the utility model provides an air-floating clamping structure, including a clamping body 100 and a shell 200. The clamping body 100 is cylindrical and is provided with an air-floating shaft hole 101 extending axially therethrough. The shell 200 is mounted on the outer circumference of the clamping body 100. An annular air cavity 102 is formed between the shell 200 and the outer wall of the clamping body 100. The clamping body 100 and / or the shell 200 are provided with an air inlet 103 communicating with the annular air cavity 102. The clamping body 100 is provided with multiple rows of radial holes 104 distributed circumferentially. The radial holes 104 form an air inlet end on the outer wall of the clamping body 100, and the radial holes 104 form an air outlet end on the hole wall of the air-floating shaft hole 101. The aperture of the air inlet end of the radial hole 104 is larger than the aperture of the air outlet end, forming a throttling effect. The aperture of the air outlet end of the radial hole 104 is not greater than 0.1 mm.

[0030] Combine Figure 1-Figure 5 In the technical solution of the present invention, the air-floating clamping structure can be used to guide and support the electric spindle of the drilling equipment. During operation, the electric spindle 300 is placed in the air-floating shaft hole 101. Through external air supply, the gas enters the annular air cavity 102 between the clamp body 100 and the housing 200 from the air inlet 103. The high-pressure gas then evenly passes through the multiple rows of radial holes 104, forming a high-pressure air film between the electric spindle and the clamp body 100, so that the electric spindle and the clamp body 100 are suspended without contact. The electric spindle can slide flexibly along its axis, thereby achieving higher-precision feeding and resetting along the axis. In the present invention, by making the aperture of the outlet end of the radial hole 104 no larger than 0.1mm, a micro-pore throttling structure is formed. Compared with small-hole throttling, micro-pore throttling can greatly improve the stiffness of the air-floating bearing, improve drilling accuracy, and consume less air volume.

[0031] In some embodiments, see Figure 3 、 Figure 4 Each row of radial holes 104 is located on the same circumference of the inner wall of the air-floating shaft hole 101. The hole wall of the air-floating shaft hole 101 is provided with a plurality of annular grooves 105. The annular grooves 105 are connected to the air outlet ends of each row of radial holes 104. The air outlet ends of the plurality of radial holes 104 are connected through the annular grooves 105, so that the airflow input from the radial holes 104 is distributed in the annular grooves 105, thereby increasing the distribution range and continuity of the airflow discharged from the air outlet end on the hole wall of the air-floating shaft hole 101, thereby being able to obtain greater air-floating bearing stiffness.

[0032] Further, see Figure 3 、 Figure 4 The wall of the air-bearing shaft hole 101 is provided with an air-avoidance groove 106. This air-avoidance groove 106 is annular and extends circumferentially along the wall of the air-bearing shaft hole 101. The air-avoidance groove 106 is located near the middle of the length of the clamp body 100. An exhaust passage 107 is provided within the clamp body 100 and communicates with the air-avoidance groove 106. The clamp body 100 and / or the housing 200 are provided with an exhaust port 108 that communicates with the exhaust passage 107. Airflow entering the air-bearing shaft hole 101 of the clamp body 100 partially flows into the air-avoidance groove 106 and then further passes through the exhaust passage 107 and out of the air-bearing clamp structure through the exhaust port 108, further increasing the stiffness of the air-bearing bearing.

[0033] In some embodiments, see Figure 1-Figure 4The end of the clamping body 100 is provided with a flange structure 109 extending radially outward, which can be used for installation of the air floatation clamping structure on the drilling equipment, etc.

[0034] Further, referring to Figure 7 The flange structure 109 has a flange surface 111 perpendicular to the axis direction of the air floatation shaft hole 101, and a plurality of waist-shaped grooves 112 are formed in the flange surface 111, which are used for connection and position adjustment of the air floatation clamping structure on the drilling equipment, and the air floatation clamping structure has the characteristics of adjustable function and high precision through the waist-shaped grooves.

[0035] In some embodiments, referring to Figure 3 、 Figure 4 The shell 200 is sleeved on the clamping body 100 away from the flange structure 109, and the shell 200 is fixed on the clamping body 100 away from the flange structure 109 through the snap spring 201, the two ends of the shell 200 are positioned through the flange structure 109 and the snap spring 201 respectively, the whole structure has higher stability, and the assembly is more convenient.

[0036] Referring to Figure 3 、 Figure 4 The shell 200 and the clamping body 100 are provided with sealing rings 202 at the two ends of the annular air cavity 102, which prevent the gas injected into the annular air cavity 102 from overflowing from the two ends, and ensure that the air floatation bearing has higher rigidity.

[0037] In some embodiments, the hole wall of the air floatation shaft hole 101 is provided with a wear-resistant insulation layer, such as an oxidation layer or a coating layer, which has the characteristics of wear resistance and insulation, and the purpose is to ensure the insulation between the motorized spindle and the air floatation bearing and prolong the service life of the air floatation bearing.

[0038] In some embodiments, the embodiment of the utility model also provides another embodiment of the air floatation clamping structure, referring to Figure 1-Figure 4 、 Figure 6, including a clamp body 100 and a shell 200, the clamp body 100 is provided with an air-floating shaft hole 101 extending axially therethrough, the shell 200 is sleeved on the outer circumference of the clamp body 100, an annular air cavity 102 is formed between the shell 200 and the outer wall of the clamp body 100, the clamp body 100 and / or the shell 200 are provided with an air inlet 103 communicating with the annular air cavity 102, the clamp body 100 is provided with multiple rows of radial holes 104 distributed along the circumferential direction, the radial holes 104 form an air inlet end on the outer wall of the clamp body 100, and the radial holes 104 form an air outlet end on the hole wall of the air-floating shaft hole 101, and a microporous throttle 400 is provided at the air outlet end, and the microporous throttle 400 is provided with a plurality of micropores not larger than 0.1 mm. In this embodiment, micropores no larger than 0.1 mm are directly formed on the microporous throttle, and then the outlet end of the radial hole 104 of the clamp body 100 of the microporous throttle is connected to the air outlet end of the radial hole 104 of the clamp body 100, which can effectively reduce the difficulty of directly setting micropores on the inner wall surface of the air floating shaft hole 101 of the clamp body 100.

[0039] During operation, the electric spindle is inserted into the air bearing bore 101. Externally supplied air enters the annular air chamber 102 between the clamp body 100 and the housing 200 from the air inlet 103. High-pressure air then evenly passes through multiple rows of radial holes 104, forming a high-pressure air film between the electric spindle and the clamp body 100. This creates a contactless suspension between the electric spindle and the clamp body 100, allowing the electric spindle to slide flexibly along its axis. In this utility model, the micropores of the micropore restrictor are formed into a micropore throttling structure. Compared to small-pore throttling, micropore throttling can significantly increase the stiffness of the air bearing, improve drilling accuracy, and consume less air.

[0040] The embodiment of the present utility model also provides a drilling mechanism, see Figure 1 , including an electric spindle 300 and the air-floating clamping structure in any of the above embodiments, the electric spindle 300 is inserted into the air-floating shaft hole 101.

[0041] An embodiment of the present utility model further provides a drilling device, comprising the drilling mechanism in any of the above embodiments.

[0042] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0043] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. An air-floating clamping structure, characterized in that: It includes a clamp body and a shell, the clamp body is provided with an air-floating shaft hole that passes through in the axial direction, the shell is sleeved on the outer circumference of the clamp body, and an annular air cavity is formed between the shell and the outer wall surface of the clamp body, the clamp body and / or the shell is provided with an air inlet connected to the annular air cavity, the clamp body is provided with multiple rows of radial holes distributed along the circumferential direction, the radial holes form an air inlet end on the outer wall surface of the clamp body, the radial holes form an air outlet end on the hole wall of the air-floating shaft hole, the aperture of the air inlet end of the radial hole is larger than the aperture of the air outlet end, and the aperture of the air outlet end of the radial hole is not greater than 0.1mm.

2. The air-floating clamping structure according to claim 1, characterized in that: The hole wall of the air-floating shaft hole is provided with a plurality of annular grooves, and the annular grooves are communicated with the air outlet ends of each row of the radial holes.

3. The air-floating clamping structure according to claim 1, characterized in that: The hole wall of the air-floating shaft hole is provided with an air-avoiding groove, the interior of the clamp body is provided with an exhaust channel, the exhaust channel is communicated with the air-avoiding groove, and the clamp body and / or shell is provided with an exhaust port communicated with the exhaust channel.

4. The air-floating clamping structure according to claim 3, characterized in that: A flange structure is provided at the end of the clamp body, the exhaust port and the air inlet are arranged on the outer peripheral surface of the flange structure, and an air inlet joint is provided at the air inlet.

5. The air-floating clamping structure according to claim 4, characterized in that: The flange structure has a flange surface which is perpendicular to the axial direction of the air-floating shaft hole, and a plurality of waist-shaped grooves are formed on the flange surface.

6. The air-floating clamping structure according to claim 4, characterized in that: The shell is sleeved on the clamp body at one end away from the flange structure, and the shell is fixed to the clamp body at the end away from the flange structure by a retaining spring. Sealing rings are provided at both ends of the annular air cavity between the shell and the clamp body, and the shell and / or the clamp body are provided with a sealing ring groove, and the sealing ring is arranged in the sealing ring groove.

7. The air-floating clamping structure according to claim 1, characterized in that: The hole wall of the air-floating shaft hole is provided with a wear-resistant insulating layer.

8. An air-floating clamping structure, characterized in that: The clamp comprises a clamp body and a shell, wherein the clamp body is provided with an air-floating shaft hole extending axially therethrough, the shell is sleeved on the outer circumference of the clamp body, an annular air cavity is formed between the shell and the outer wall of the clamp body, the clamp body and / or the shell is provided with an air inlet connected to the annular air cavity, the clamp body is provided with multiple rows of radial holes distributed along the circumferential direction, the radial holes form an air inlet end on the outer wall of the clamp body, the radial holes form an air outlet end on the hole wall of the air-floating shaft hole, the air outlet end is provided with a microporous throttle, and the microporous throttle is provided with a number of micropores not larger than 0.1 mm.

9. A drilling mechanism, characterized in that: The invention comprises an electric spindle and the air-floating clamping structure according to any one of claims 1 to 8, wherein the electric spindle is inserted into the air-floating shaft hole.

10. A drilling device, characterized in that: Including the drilling mechanism according to claim 9.

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