Central water outlet main shaft

Abstract

The invention relates to the technical field of machining, and discloses a center water outlet main shaft which comprises a machine body. The shaft core is arranged in an inner cavity of the machine body; the vibrator assembly is arranged at the end part of the shaft core and comprises a transducer module and a vibrator, the transducer module is arranged on the peripheral surface of the vibrator, and a cutter handle is arranged in an inner cavity of the vibrator; the broach assembly is arranged in an inner cavity of the shaft core and used for connecting and positioning the cutter handle; and the central water outlet mechanism is used for introducing a cooling medium, and the cooling medium sequentially passes through the shaft core, the vibrator assembly and the inner cavity of the cutter handle, cools the cutter at the end of the cutter handle and then acts on a workpiece to be machined. A cooling medium is introduced through the center water outlet mechanism, center water outlet is achieved to cool the cutter, the service life of the cutter is prolonged, and the working reliability of the main shaft is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a central water outlet spindle. Background Technology

[0002] Currently, in the machining industry, the demands for high precision, high gloss, and high efficiency in products require ensuring the high speed and high precision of machining equipment, especially spindles. This also places higher demands on spindle cutting tools, such as good wear resistance and long service life. With the gradual improvement of mechanical automation, machining equipment is now trending towards high-power, high-speed internal cooling processing equipment to improve the efficiency and quality of processes such as drilling, milling, and grinding.

[0003] Traditional CNC machining equipment generally lacks a central water cooling system. To ensure the high precision, high gloss, and high efficiency requirements of products, high-precision CNC machine tool spindles with internal cooling are necessary. Existing internally cooled spindles typically have a central bore and a water outlet structure at the rotor tail end, through which coolant enters the tool holder cavity. However, traditional direct-drive spindles require an external motor drive at the rear end and cannot incorporate a water outlet structure at the rotor tail end, thus preventing the implementation of internal cooling. Summary of the Invention

[0004] The purpose of this invention is to address the technical problems existing in the prior art by providing a centrally outlet water-cooled spindle. The cooling medium is introduced through the central water outlet mechanism and passes sequentially through the spindle core, the oscillator assembly, and the tool holder, thereby cooling the tool at the end of the tool holder and ensuring the reliability of the spindle operation.

[0005] To address the problems mentioned above, the technical solution adopted by this invention is as follows:

[0006] This invention provides a central water outlet spindle, comprising:

[0007] Organism;

[0008] The shaft core is located inside the machine body;

[0009] An oscillator assembly, located at the end of a shaft core, includes a transducer module and an oscillator. The transducer module is disposed on the outer circumferential surface of the oscillator, and a tool holder is disposed in the inner cavity of the oscillator.

[0010] The broach assembly is located inside the spindle core and is used to connect and position the tool holder.

[0011] The central water outlet mechanism is used to introduce cooling medium. The cooling medium passes through the shaft core, vibrator and tool holder cavity in sequence, and cools the tool at the end of the tool holder before acting on the workpiece to be processed.

[0012] Furthermore, the central water outlet mechanism includes an air-floating bearing and a bearing sleeve disposed on the outer circumference of the air-floating bearing. The air-floating bearing is disposed on the outer circumference of the shaft core and corresponds to the position of the transducer module. Corresponding liquid inlet holes and liquid inlet passages are provided on the air-floating bearing and the bearing sleeve for connecting the liquid inlet to allow the cooling medium to pass through.

[0013] Furthermore, the central water outlet mechanism also includes multiple media channels. The shaft core is provided with a media channel that connects to the liquid inlet hole. The vibrator is provided with an axial channel and a radial channel that connect to each other. The radial channel is connected to the media channel. The axial channel corresponds to the position of the transducer module and is connected to the inner cavity of the tool holder.

[0014] Furthermore, the air bearing is also provided with interconnected air bearing holes and air bearing channels, the air bearing channels are connected to the air inlet and allow sealing gas to pass through; a small orifice throttle is provided inside the air bearing holes.

[0015] Furthermore, the air bearing is also provided with an overflow hole and an overflow channel that are connected to each other. The overflow hole is connected to the medium channel, and the overflow channel is connected to the liquid outlet.

[0016] Furthermore, the air bearing is also provided with an overflow groove that connects the overflow hole and the overflow channel; the bearing outer sleeve is also provided with an air flotation passage that connects the air inlet and the air flotation hole, and an overflow circuit that connects the overflow hole and the liquid outlet.

[0017] Furthermore, the broach assembly includes a pull rod and a pull stud disposed within the shaft core. The pull stud is disposed at the end of the pull rod and connected to the tool holder. The pull rod has a radial through hole, and the pull stud has a central through hole, which communicates with the radial through hole and the inner cavity of the tool holder, respectively.

[0018] Furthermore, a one-way valve is provided in the inner cavity of the other end of the pull rod opposite the pull stud.

[0019] Furthermore, an energy transmission component is disposed inside the body and on the outer periphery of the shaft core. The energy transmission component includes a wireless power supply module and a wireless power receiving module that are opposite to each other and spaced apart. The wireless power supply module is connected to an external ultrasonic power source, and the wireless power receiving module is connected to a transducer module.

[0020] Furthermore, the shaft core is provided with a wire outlet hole and a wire embedding hole, the wire outlet hole is used to pass through the wire connecting the wireless power receiving module and the transducer module, and the wire embedding hole is used to store the wire; the wire segment between the wire outlet hole and the wire embedding hole is pressed together by the outer edge of the fixing member on the shaft core.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In this invention, a central water outlet mechanism is set up to introduce cooling medium. The cooling medium passes through the spindle core, the vibrator assembly and the inner cavity of the tool holder in sequence to cool the tool and improve the tool's service life. The spindle is made to vibrate ultrasonically through the transducer module. When the cooling medium acts on the workpiece to be processed, it can remove the chips on the surface of the workpiece. Under the action of ultrasonic vibration, a cavitation effect can also be generated on the surface of the workpiece, which improves the processing quality and chip removal efficiency of the workpiece surface and also ensures the processing efficiency.

[0023] 2. The central water outlet mechanism of the present invention adopts an air-bearing bearing and a bearing sleeve, and can correspond to the position of the transducer module, that is, the central water outlet mechanism is placed in front, which solves the problem that the external drive spindle cannot be connected to the cooling device from the rear end, realizes the cooling of the tool, and ensures the sealing of the spindle and the reliability of its operation.

[0024] 3. The air bearing of the present invention introduces cooling medium through an inlet hole, introduces sealing gas through an air flotation hole and an air flotation channel to achieve air seal, and provides an overflow hole and an overflow channel to allow cooling medium to flow back. That is, the air bearing adopts a double sealing structure of overflow hole and air flotation hole, which ensures the sealing reliability of water outlet and further ensures the reliability of spindle operation. Attached Figure Description

[0025] To more clearly illustrate the solutions in this invention, a brief introduction to the accompanying drawings used in the description of the embodiments will be provided below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort. Wherein:

[0026] Figure 1 This is an overall structural diagram of the central water outlet main shaft of the present invention.

[0027] Figure 2 This is another structural diagram of the central water outlet main shaft of the present invention.

[0028] Figure 3 This is a schematic diagram of the air flotation circuit of the central water outlet main shaft of the present invention.

[0029] Figure 4 This is a schematic diagram of the overflow circuit of the central water outlet main shaft of the present invention.

[0030] Figure 5 This is a partially enlarged schematic diagram (A) of the central water outlet main shaft of the present invention.

[0031] Figure 6 This is a structural diagram of the air bearing in this invention.

[0032] Figure 7 This is a front view of the air bearing in this invention.

[0033] Figure 8 This is a schematic diagram of the wire end protection in this invention.

[0034] Among them, 1-body, 2-shaft core, 3-wireless power supply module, 4-wireless power receiving module, 5-front bearing assembly, 6-rear bearing assembly, 7-transducer module, 8-air bearing, 9-vibrator, 10-gear disk, 11-tool holder, 12-bearing outer sleeve, 13-drawing tool assembly, 14-small orifice throttle, 15-one-way valve, 16-preload spring, 17-wire, 21-medium channel, 91-axial channel, 92-radial channel, 81-liquid inlet, 82-air... Float hole, 82a-first air flotation hole, 82b-second air flotation hole, 82c-third air flotation hole, 83-overflow hole, 83a-upper overflow hole, 83a, 83b-lower overflow hole, 84-air flotation channel, 85-overflow channel, 86-overflow groove, 121-liquid inlet passage, 122-air flotation passage, 123-overflow circuit, 131-pull rod, 132-pull stud, 1311-radial through hole, 201-outlet hole, 202-embedded wire hole, 203-fixing component. Detailed Implementation

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0036] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order. In the specification, claims, and accompanying drawings of this invention, when an element is referred to as "fixed to," "mounted to," "disposed of," or "connected to" another element, it may be directly or indirectly located on that other element. For example, when an element is referred to as "connected to" another element, it may be directly or indirectly connected to that other element.

[0037] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] See Figures 1-6 As shown, the present invention provides a central water outlet spindle, comprising:

[0039] Body 1;

[0040] The shaft core 2 is disposed in the inner cavity of the body 1 and is capable of rotating relative to the body 1;

[0041] The oscillator assembly, located at the end of the shaft core 2, includes a transducer module 7 and an oscillator 9. The transducer module 7 is disposed on the outer peripheral surface of the oscillator 9, and a tool holder 11 is disposed in the inner cavity of the oscillator 9.

[0042] The puller assembly 13 is disposed in the inner cavity of the shaft core 2 and is used to connect and position the tool holder 11, that is, to control the pull and release of the tool holder 11 when the tool holder 11 is replaced.

[0043] A central water outlet mechanism is located on the outer periphery of the shaft core 2 and corresponds to the position of the transducer assembly. It is used to introduce cooling medium. The cooling medium passes through the shaft core 2, the vibrator 9 and the inner cavity of the tool holder 11 in sequence, and cools the tool at the end of the tool holder 11 before acting on the workpiece to be processed.

[0044] In this embodiment, the transducer module 7 of the oscillator assembly is connected to the energy transmission assembly, enabling the spindle to perform ultrasonic vibration machining, thereby improving the surface finish of the product, extending the tool life, and meeting the high-precision machining requirements. By setting a central water outlet mechanism to introduce cooling medium, the heated transducer module 7 and tool holder 11 can be cooled, ensuring the reliability of the spindle operation and improving the surface finish of the product.

[0045] Furthermore, the central water outlet mechanism includes an air-bearing bearing 8 and a bearing sleeve 12. The air-bearing bearing 8 is disposed on the outer periphery of the end of the shaft core 2 and corresponds to the position of the transducer module 7. The bearing sleeve 12 is disposed on the outer peripheral surface of the air-bearing bearing 8 and is used to protect and position the air-bearing bearing 8. Corresponding liquid inlet holes 81 and liquid inlet passages 121 are provided on the air-bearing bearing 8 and the bearing sleeve 12 for connecting the liquid inlet to allow the cooling medium to pass through.

[0046] Furthermore, the central water outlet mechanism also includes multiple media flow channels. The shaft core 2 is provided with a media channel 21 that communicates with the liquid inlet hole 81. The vibrator 9 is provided with an axial channel 91 and a radial channel 92 that communicate with each other. The radial channel 92 communicates with the media channel 21. The axial channel 91 corresponds to the position of the transducer module 7 and communicates with the inner cavity of the tool holder 11, so as to facilitate the flow of cooling medium in the corresponding channel, thereby realizing the cooling of the transducer module 7 and the tool holder 11.

[0047] In other embodiments of the present invention, the air bearing 8 and the bearing sleeve 12 can also be disposed in the middle and rear ends of the shaft core 2, respectively. Taking the air bearing 8 and the bearing sleeve 12 being located at the rear end of the shaft core 2 as an example, the air bearing 8 is disposed on the outer circumferential surface of the shaft core 2 and located on one side of the rear end cover. The shaft core 2 has a relatively long medium hole along the axial direction. The medium hole is connected to the liquid inlet hole 81 of the air bearing 8 and the inner cavity of the tool holder 11, respectively. This allows the cooling medium to be introduced and, after passing through the broach assembly 13, to cool the tool through the inner cavity of the tool holder. Compared to this embodiment, which places the air bearing 8 at the front end of the shaft core 2 and corresponds to the position of the transducer module 7, this avoids the need to open a relatively long medium hole on the shaft core 2, thereby improving the structural rigidity of the shaft core 2 and shortening the movement stroke of the cooling medium, thus improving the working efficiency of the mechanism.

[0048] Furthermore, the air bearing 8 is also provided with a connected air bearing hole 82 and an air bearing channel 84. The air bearing channel 84 is connected to the air inlet and allows sealing gas to be introduced for air sealing of the spindle. A small orifice throttle 14 is provided in the air bearing hole 82 of the air bearing 8 to adjust the pressure of the sealing gas and ensure the reliability of the spindle air seal.

[0049] Specifically, to ensure the reliability of the overall air seal of the spindle, three sets of air bearing holes 82 are provided along the axial direction on the air bearing 8, namely, the first air bearing hole 82a, the second air bearing hole 82b, and the third air bearing hole 82c. Figure 3 As shown in the diagram, the inlet hole 81 is located between the two sets of air flotation holes 82. Each set of air flotation holes 82 has multiple holes arranged along the circumference of the air flotation bearing 8. Each air flotation hole 82 is provided with a small orifice throttle 14. Figure 5 As shown in the figure, the sealing gas pressure can be adjusted separately.

[0050] Furthermore, the air bearing 8 is also provided with an overflow hole 83 and an overflow channel 85 that are connected to each other. The overflow hole 83 is connected to the medium channel 21, and the overflow channel 85 is connected to the liquid outlet. Excess cooling medium in the medium channel 21 flows back and is discharged after passing through the overflow hole 83 and the overflow channel 85, which further ensures the sealing of the spindle.

[0051] Specifically, the inlet hole 81, the air flotation hole 82, and the overflow hole 83 are arranged sequentially along the radial direction of the air flotation bearing 8 and connect to the inner cavity of the air flotation bearing 8. The overflow hole 83 consists of two sets: an upper overflow hole 83a and a lower overflow hole 83b, respectively located on both sides of the inlet hole 81. The overflow hole 83 is located between the inlet hole 81 and the air flotation hole 82; that is, the upper overflow hole 83a is located between the inlet hole 81 and the first air flotation hole 82a, and the lower overflow hole 83b is located between the inlet hole 81 and the second air flotation hole 82b. Figure 5 and Figure 6 As shown in the figure, this ensures the reliability of the spindle operation.

[0052] In this embodiment, the number of both the air flotation hole 82 and the overflow hole 83 can be increased or decreased according to actual needs, and the positional relationship of the liquid inlet hole 81, the air flotation hole 82 and the overflow hole 83 can also be adjusted according to actual needs, all of which can meet the requirements of the spindle operation.

[0053] Furthermore, the air bearing 8 is also provided with an overflow groove 86. The overflow groove 86 is arranged along the circumference of the air bearing 8 and is connected to the overflow hole 83 and the overflow channel 85 respectively. That is, the excess cooling medium in the overflow hole 83 is first stored in the overflow groove 86 and then discharged through the overflow channel 85 to ensure the reliability of the operation.

[0054] Furthermore, the bearing outer sleeve 12 is also provided with an air flotation passage 122 and an overflow circuit 123 radially. The air flotation passage 122 connects the air inlet and the air flotation hole 82, and the overflow circuit 123 connects the overflow hole 83 and the liquid outlet, so that the sealing gas can flow in smoothly and the cooling medium can flow back and be discharged smoothly. Specifically, in order to facilitate the reliable entry and return discharge of the cooling medium, and also to facilitate the entry of the sealing gas, the bearing outer sleeve 12 is provided with connectors at the liquid inlet, liquid outlet and air inlet respectively.

[0055] Furthermore, the broach assembly 13 includes a pull rod 131 and a pull stud 132. The pull rod 131 is disposed within the shaft core 2; the pull stud 132 is disposed at the end of the pull rod 131 and connects with the tool holder 11; a radial through hole 1311 is provided on the pull rod 131. Figure 1 As shown in the figure, the pull stud 132 is provided with a central through hole, which is connected to the radial through hole 1311 and the inner cavity of the tool holder 11 respectively. The radial through hole 1311 is connected to the axial channel 91 and the central through hole.

[0056] Specifically, depending on the size of the handle 11, the pull rod 131 and the pull pin 132 can be connected by ball joint. Figure 1 , Figure 2As shown in the diagram, it can also be connected by a pull claw to reliably position tool holders 11 of different sizes, and facilitate tool changing operations. The radial through hole 1311 connects the axial channel 91 and the central through hole, and allows cooling medium to enter the inner cavity of the tool holder 11, which facilitates machining and avoids machining medium flow channels on the surface of the tool holder 11, thus avoiding affecting the integrity and precision of the tool holder 11 surface.

[0057] Furthermore, a one-way valve 15 is provided at the other end of the pull rod 131 opposite to the pull pin 132. The one-way valve 15 is connected to the central through hole of the pull pin 132. When the cooling medium enters the central through hole of the pull pin 132 in the radial through hole 1311, it can prevent some of the cooling medium from entering the spindle end in the opposite direction along the central hole of the pull rod 131, thereby affecting the operation of the motor drive device at the rear end of the spindle.

[0058] In this embodiment, in order to ensure the reliability of the central water outlet mechanism, the oscillator 9 is provided with sealing elements on the mating surfaces of the shaft core 2 and the pull rod 131, and the pull pin 132 is provided with sealing elements on the mating surfaces of the pull rod 131 and the tool holder 11, respectively, to prevent leakage when the cooling medium flows sequentially, which would affect the operation of other components of the spindle.

[0059] Furthermore, an energy transmission component is provided inside the body 1 and on the outer periphery of the shaft core 2. The energy transmission component includes a wireless power supply module 3 and a wireless power receiving module 4 that are opposite to each other and spaced apart. The wireless power supply module 3 is connected to an external ultrasonic power source (not shown in the figure), and the wireless power receiving module 4 is connected to a transducer module 7 to perform wireless power transmission for ultrasonic processing.

[0060] Specifically, depending on the installation space within the body 1 and different processing requirements, the wireless power supply module 3 and the wireless power receiving module 4 can be arranged along the axial or radial direction of the shaft core 2, and the gap between the wireless power supply module 3 and the wireless power receiving module 4 can be adjusted to meet the needs of different power levels.

[0061] Specifically, a front bearing assembly 5 and a rear bearing assembly 6 are respectively arranged opposite each other on the outer circumference of the shaft core 2 inside the body 1. The front bearing assembly 5 and the rear bearing assembly 6 are located on both sides of the energy transmission module and can provide radial support for the rotating components such as the shaft core 2, ensuring that the front / rear bearing assembly has sufficient load-bearing capacity and rigidity. A preload spring 16 is also provided inside the body 1 to act on the front bearing assembly 5 and / or the rear bearing assembly 6, which can axially preload the front bearing assembly 5 and the rear bearing assembly 6 to ensure their rigidity and thus ensure the reliability of operation.

[0062] For further details, please refer to [link / reference]. Figure 7As shown, the shaft core 2 is provided with a wire outlet hole 201 and a wire embedding hole 202. The wire 17 connecting the wireless power receiving module 4 and the transducer module 7 passes through the wire outlet hole 201 and is stored in the wire embedding hole 202 and fixed with glue. This prevents the wire ends from accumulating in the cavity of the shaft core 2 where the vibrator 9 is located, and also prevents the wire 17 from being pulled apart by long-term centrifugal force when the shaft core 2 rotates at high speed, which would affect the wireless power transmission and thus the reliability of the spindle operation. To further ensure the secure installation of the wire 17, the wire section between the wire outlet hole 201 and the wire embedding hole 202 is pressed together by a fastener 203 (such as the outer edge of a nut) on the shaft core 2.

[0063] Specifically, a gear disk 10 is provided on the outer periphery of the oscillator 9 to facilitate the replacement of the tool holder 11.

[0064] In this embodiment, when the main shaft performs center water discharge and overflow, it is necessary to ensure the overall structure's airtightness. Specifically, sealing gas is introduced into the air flotation passage 122. This sealing gas passes through the air flotation holes 82, achieving airtight seals between the air flotation bearing 8 and the shaft core 2 and the machine body 1, and between the shaft core 2 and the vibrator 9 and the machine body 2, thereby ensuring the overall structure's airtightness. Figure 2 As shown in the image.

[0065] Figure 1 As shown in the central water outlet line, the cooling medium (including cooling oil, cooling water or coolant) enters the liquid inlet passage 121 of the bearing outer sleeve 12 through the liquid inlet, and then passes through the liquid inlet hole 81 of the air bearing 8, the medium channel 21 of the shaft core 2, the radial channel 92 and axial channel 91 of the vibrator 9, and the radial through hole 1311 of the tie rod 131 in sequence, and then enters the center hole of the tie pin 132 and the center of the tool holder 11, and cools the tool at the end of the tool holder 11. The cooling medium discharge also acts on the workpiece to be processed; and the excess cooling medium passes through the overflow hole 83, the overflow groove 86 and the overflow channel 85 in sequence, and then is discharged from the liquid outlet through the overflow circuit 123.

[0066] By providing a radial through hole 1311 on the tie rod 131, the cooling medium enters the central through hole of the tie rod 132 through the radial through hole 1311, thus achieving central water outlet to cool the tool, improving the tool's service life, protecting the integrity and precision of the tool holder 11 surface, facilitating machining, and enabling compatibility with tool holders 1 of different specifications. The cooling medium acts on the surface of the workpiece to be machined, which can remove chips from the workpiece surface, and under the action of ultrasonic vibration, can generate a cavitation effect on the workpiece surface, improving the workpiece surface machining performance and machining quality.

[0067] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A centrally located water outlet spindle, characterized in that: include: Organism; The shaft core is located inside the machine body; An oscillator assembly, located at the end of a shaft core, includes a transducer module and an oscillator. The transducer module is disposed on the outer circumferential surface of the oscillator, and a tool holder is disposed in the inner cavity of the oscillator. The broach assembly is located inside the spindle core and is used to connect and position the tool holder. The central water outlet mechanism is used to introduce cooling medium. The cooling medium passes through the shaft core, the oscillator assembly and the inner cavity of the tool holder in sequence, and cools the tool at the end of the tool holder before acting on the workpiece to be processed.

2. The central water outlet spindle according to claim 1, characterized in that: The central water outlet mechanism includes an air-floating bearing and a bearing sleeve disposed on the outer circumference of the air-floating bearing. The air-floating bearing is disposed on the outer circumference of the shaft core and corresponds to the position of the transducer module. Corresponding liquid inlet holes and liquid inlet passages are provided on the air-floating bearing and the bearing sleeve for connecting the liquid inlet to allow the cooling medium to pass through.

3. The central water outlet spindle according to claim 2, characterized in that: The central water outlet mechanism also includes multiple media channels. The shaft core is provided with a media channel that communicates with the liquid inlet hole. The vibrator is provided with an axial channel and a radial channel that communicate with each other. The radial channel communicates with the media channel. The axial channel corresponds to the position of the transducer module and communicates with the inner cavity of the tool holder.

4. The central water outlet spindle according to claim 2, characterized in that: The air bearing is also provided with interconnected air bearing holes and air bearing channels. The air bearing channels are connected to the air inlet and allow sealing gas to pass through. A small orifice throttle is provided inside the air bearing holes.

5. The central water outlet spindle according to claim 2 or 4, characterized in that: The air bearing is also provided with an overflow hole and an overflow channel that are connected to each other. The overflow hole is connected to the medium channel, and the overflow channel is connected to the liquid outlet.

6. The central water outlet spindle according to claim 5, characterized in that: The air bearing is also provided with an overflow groove that connects the overflow hole and the overflow channel; the bearing outer sleeve is also provided with an air flotation passage that connects the air inlet and the air flotation hole, and an overflow circuit that connects the overflow hole and the liquid outlet.

7. The central water outlet spindle according to claim 2 or 6, characterized in that: The broach assembly includes a pull rod and a pull stud disposed within the shaft core. The pull stud is disposed at the end of the pull rod and connected to the tool holder. The pull rod has a radial through hole, and the pull stud has a central through hole. The central through hole communicates with the radial through hole and the inner cavity of the tool holder, respectively.

8. The central water outlet spindle according to claim 7, characterized in that: A one-way valve is installed in the inner cavity of the other end of the pull rod opposite the position of the pull stud.

9. The central water outlet spindle according to claim 1, characterized in that: An energy transmission component is disposed inside the body and on the outer periphery of the shaft core. The energy transmission component includes a wireless power supply module and a wireless power receiving module that are opposite to each other and spaced apart. The wireless power supply module is connected to an external ultrasonic power source, and the wireless power receiving module is connected to the transducer module.

10. The central water outlet spindle according to claim 9, characterized in that: The shaft core is provided with a wire outlet hole and a wire embedding hole. The wire outlet hole is used to pass through the wire connecting the wireless power receiving module and the transducer module, and the wire embedding hole is used to store the wire. The wire segment between the wire outlet hole and the wire embedding hole is pressed together by the outer edge of the fixing member on the shaft core.

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