Ultrasonic spindle unit

Abstract

The utility model relates to the technical field of precision machining, and discloses an ultrasonic main shaft unit which comprises a body and a shaft core arranged in the body, a vibrator is contained in an inner cavity of the end of the shaft core, a cutter handle is arranged in an inner cavity of the vibrator, and a pull rod matched with the cutter handle is arranged in the inner cavity of the shaft core. A cutter clamping disc is arranged on the periphery of the cutter handle, and the middle of the cutter clamping disc is matched with the cutter handle in a limiting mode. The side face of the cutter clamping disc extends in the axial direction to form an installation boss or an installation concave part, and the installation boss or the installation concave part is connected and matched with the corresponding side face of the shaft core and located in an inner cavity of the end of the body. According to the utility model, the overall assembly process is simplified, the overall assembly precision is improved, and the overall working efficiency of the main shaft can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of precision machining, and more specifically, to an ultrasonic spindle unit. Background Art

[0002] Ultrasonic machining is widely used in the machining of non-metallic, hard and brittle materials that are difficult to machine, as well as the machining of micro-holes and deep holes due to the ultrasonic energy at the tip of the cutting tool. In an ultrasonic spindle, an oscillator is placed at the end of the shaft core to drive the tool holder in the inner cavity of the oscillator for ultrasonic vibration machining. A tool clamping disc is provided at the tail end of the spindle, and a tool chuck is provided at the front end of the spindle, which facilitates tool clamping and tool holder replacement.

[0003] In the current structure of the ultrasonic spindle, there is an oscillator flange structure between the tool chuck at the front end and the shaft core. It is necessary to consider the installation relationship among the shaft core, the tool clamping disc and the oscillator flange at the same time. The tool chuck is generally connected to the oscillator flange, which increases the difficulty of installing the oscillator as a whole with the shaft core, affects the overall assembly accuracy, and also affects the overall working efficiency. In addition, the stiffness at the connection between the oscillator and the shaft core is weak, which also affects the overall rigidity of the spindle. Summary of the Invention

[0004] The purpose of the utility model is to provide an ultrasonic spindle unit aiming at the technical problems existing in the prior art, which simplifies the overall assembly process, improves the overall assembly accuracy, and can improve the working efficiency.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0006] The utility model provides an ultrasonic spindle unit, which includes a body and a shaft core arranged in the body. The inner cavity at the end of the shaft core accommodates an oscillator, a tool holder is arranged in the inner cavity of the oscillator, and a pull rod cooperating with the tool holder is arranged in the inner cavity of the shaft core;

[0007] A tool chuck is arranged on the outer periphery of the tool holder, and the middle part of the tool chuck is in limit cooperation with the tool holder; an installation boss or an installation recess is axially extended along the side surface of the tool chuck, and the installation boss or the installation recess is connected and cooperated with the corresponding side surface of the shaft core and is located in the inner cavity at the end of the body.

[0008] Further, the end of the oscillator connected with the flange abuts against the inner wall of the shaft core. The two opposite ends of the connecting flange are respectively axially extended to form a first connecting part and a second connecting part. The first connecting part abuts against the corresponding side surface of the tool chuck, and the second connecting part abuts against the inner side wall of the shaft core.

[0009] Further, a sealing ring is arranged between the matching surface of the outer periphery of the oscillator and the shaft core for axial sealing or radial sealing between the oscillator and the shaft core.

[0010] Further, a primary side assembly and a secondary side assembly are oppositely arranged along the axial direction on the outer periphery of the shaft core. The primary side assembly is movably arranged on the side of the secondary side assembly away from the oscillator; an adjusting gear disc is movably arranged on the outer periphery of the primary side assembly for adjusting the gap between the primary side assembly and the secondary side assembly.

[0011] Further, a pre-tightening adjustment assembly is also arranged inside the body and on the outer periphery of the shaft core for pre-tightening and adjusting the rear bearing group inside the body.

[0012] Further, the pre-tightening adjustment assembly includes a pre-tightening block and a plunger unit. The pre-tightening block is arranged in the inner cavity of the body and on one side of the rear bearing group;

[0013] The plunger unit includes a plunger housing, an elastic element, and a push rod arranged in the pre-tightening block. The inner cavity of the plunger housing is provided with an elastic element; one end of the push rod is placed inside the plunger housing and abuts against the elastic element, and the other end of the push rod abuts against the corresponding end face of the rear bearing group.

[0014] Further, the pre-tightening adjustment assembly includes a retaining ring, an elastic member, and an adjusting block. The retaining ring and the adjusting block are oppositely arranged along the axial direction of the shaft core. The retaining ring abuts against the end face of the rear bearing group, and multiple groups of elastic members are arranged between the retaining ring and the adjusting block.

[0015] Further, an air cleaning assembly is also included. The air cleaning assembly is arranged between the body and the tool clamping mechanism at the rear end of the main shaft unit for air cleaning the front end of the main shaft unit; an air cleaning channel is formed between the air cleaning assembly and the tool clamping mechanism, and the air cleaning channel is sequentially communicated with the inner cavity of the pull rod and the inner cavity of the oscillator.

[0016] Further, the air cleaning assembly includes a cleaning column, a piston, and a spring. One end of the cleaning column is connected to the end of the body, and the other end corresponds to the tool clamping disc of the tool clamping mechanism; an air storage cavity is arranged on the cleaning column. The air storage cavity is provided with a spring and movably provided with a piston acting on the spring; one end of the piston abuts against the spring, and the other end cooperates with the tool clamping disc.

[0017] Further, a liquid storage groove is arranged along the circumferential direction on the outer periphery of the body, and a cooling channel communicated with the liquid storage groove is provided for introducing a cooling medium to cool the main shaft unit.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] In the present utility model, through the limit cooperation between the middle part of the tool clamping disc and the tool shank, and the direct connection between the end part of the tool clamping disc and the shaft core, the difficulty in assembling the oscillator flange and the tool clamping disc and then assembling with the shaft core is reduced, the overall assembly accuracy and structural rigidity of the main shaft are improved, and the overall working efficiency of the main shaft can be improved. Description of the Drawings

[0020] To more clearly illustrate the solutions in the present utility model, the following will briefly introduce the attached drawings required for description in the embodiments. Obviously, the attached drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings. Among them:

[0021] Figure 1 It is the structural diagram of the ultrasonic spindle unit in the present utility model.

[0022] Figure 2 It is another structural diagram of the ultrasonic spindle unit in the present utility model.

[0023] Figure 3 It is another structural diagram of the ultrasonic spindle unit in the present utility model.

[0024] Figure 4 It is the schematic diagram of the front end of the ultrasonic spindle unit in the present utility model.

[0025] Figure 5 It is the structural schematic diagram of the tool clamping chuck in the present utility model.

[0026] Figure 6 It is the schematic diagram of the first example of the preloading adjustment component in the present utility model.

[0027] Figure 7 It is the schematic diagram of the first example of the preloading adjustment component in the present utility model.

[0028] Figure 8 It is the schematic diagram of the second example of the preloading adjustment component in the present utility model.

[0029] Figure 9 It is the structural schematic diagram of the air cleaning component in the present utility model.

[0030] Figure 10 It is the structural schematic diagram of the outer periphery of the body in the present utility model.

[0031] Explanation of reference numerals: 1 - body, 101 - liquid storage tank, 102 - cooling channel, 103 - air inlet, 104 - blowing ring, 2 - shaft core, 3 - oscillator, 4 - tool shank, 5 - tool clamping chuck, 6 - front flange, 7 - pull rod, 8 - sealing ring, 9 - primary side component, 10 - secondary side component, 11 - adjusting gear disk, 12 - retaining ring, 13 - preloading adjustment component, 14 - rear bearing group, 131 - preloading block, 132 - plunger unit, 1321 - plunger housing,

[0032] 1322 - elastic element, 1323 - ejector rod, 1311 - limiting convex part, 134 - fixing part, 135 - retaining ring,

[0033] 136 - Elastic member, 137 - Adjusting block, 15 - Air cleaning assembly, 151 - Air cleaning column, 152 - Spring, 153 - Piston, 156 - Air cleaning channel, 16 - Tool clamping mechanism, 161 - Tool clamping disc, 17 - Rear end cover, 31 - Connecting flange, 311 - First connecting portion, 312 - Second connecting portion, 51 - Mounting boss, 81 - Locking boss, 52 - Tool locking key, 521 - Tool locking portion. Detailed implementation manners

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs; the terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. For example, the terms such as "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, which is only for convenience of description and cannot be construed as a limitation to this technical solution.

[0035] In addition, the terms "comprising" and "having" and any variations thereof in the description and claims of this utility model and the above-mentioned drawings are intended to cover non-exclusive inclusion; the terms "first", "second", etc. in the description and claims of this utility model or the above-mentioned drawings are used to distinguish different objects and not to describe a specific order. In the description and claims of this utility model and the above-mentioned drawings, when an element is referred to as being "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it can be directly or indirectly located on that other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to that other element.

[0036] Furthermore, the mention of "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this utility model. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] Refer to Figures 1 to 3 As shown, this utility model provides an ultrasonic spindle unit, including a body 1 and a shaft core 2 disposed inside the body 1. The inner cavity at the end of the shaft core 2 houses an oscillator 3. A tool holder 4 is disposed inside the inner cavity of the oscillator 3. A pull rod 7 is disposed inside the inner cavity of the shaft core 2, and the pull rod 7 cooperates with the tool holder 4 for positioning and tool changing operations.

[0038] A tool holder 4 is provided with a tool clamping disc 5 on its outer periphery, and the middle part of the tool clamping disc 5 is in limit fit with the tool holder 4; an installation boss 51 is axially extended from the end of the tool clamping disc 5, and the installation boss 51 is connected and fitted with the outer periphery of the shaft core 2 and is located in the inner cavity at the end of the body 1, which is convenient for installation and connection and fitting.

[0039] In this embodiment, the tool clamping disc 5 is directly fixedly connected with the shaft core 2 through the installation boss 51, and is not fixedly connected with the connection flange 31 of the oscillator 3, which simplifies the assembly process of the angular relationship during the press-fitting of the oscillator 3 and the shaft core 2, and can improve the rigidity of the overall structure.

[0040] Specifically, for the convenience of installation, a front flange 6 is provided at the end of the body 1, and the front flange 6 is also provided on the outer periphery of the end of the shaft core 2. The installation convex part 51 is located between the shaft core 2 and the front flange 6, that is, the tool clamping disc 5 is embedded in the body 1, which can improve the rigidity of the overall structure.

[0041] It can be understood that installation convex parts can also be provided on the side surface of the tool clamping disc 5, and installation concave parts matching with the installation convex parts on the tool clamping disc 5 are provided on the end surface of the shaft core 2, which can also realize the positioning and fitting between the tool clamping disc 5 and the shaft core 2 directly; or, installation concave parts are provided on the tool clamping disc 5, and installation convex parts are provided on the shaft core 2, which can also realize the positioning and fitting between the tool clamping disc 5 and the shaft core 2.

[0042] Further, referring to Figure 3 and Figure 4 As shown, the connection flange 31 on the oscillator 3 is embedded in the inner cavity of the shaft core 2, the end of the connection flange 31 on the oscillator 3 abuts against the inner wall of the shaft core 2, and the two opposite ends of the connection flange 31 are axially extended to form a first connection part 311 and a second connection part 312 respectively. The first connection part 311 abuts against the corresponding side surface of the tool clamping disc 5, and the second connection part 312 abuts against the inner side wall of the shaft core 2, which can improve the connection stiffness.

[0043] Specifically, Figure 4 As shown in the direction, the cross-section of the connection flange 31 of the oscillator 3 is a T-shaped structure. The connection flange 31 is embedded in the inner cavity of the shaft core 2 and is provided with a first connection part 311 and a second connection part 312, which respectively abut against the fitting surfaces of the tool clamping disc 5 and the shaft core 2, which can increase the axial contact area between the shaft core 2 and the connection flange 31, thereby improving the connection stability of the three parts of the shaft core 2, the oscillator 3 and the tool clamping disc 5.

[0044] Further, a sealing ring 8 is arranged between the outer periphery of the oscillator 3 and the fitting surface of the shaft core 2 for axial sealing or radial sealing, which can ensure the sealing performance of the overall structure of the spindle unit.

[0045] In this embodiment, a locking convex part 81 is provided at the end of the oscillator 3 ( Figure 2As shown in [reference figure], on the outer peripheral surface where the locking protrusion 81 mates with the shaft core 2, there is a groove, and a sealing ring 8 is arranged in the groove, enabling axial sealing or radial sealing between the locking protrusion 81 and the shaft core 2. It can be understood that on the inner peripheral surface where the shaft core 2 mates with the locking protrusion 81, or on the outer peripheral surface of the locking protrusion 81 and the inner peripheral surface of the shaft core 2 respectively, there are grooves, and the sealing ring 8 is arranged, which can also achieve axial sealing or radial sealing between the shaft core 2 and the oscillator 3. By setting the sealing ring 8 between the shaft core 2 and the oscillator 3 to achieve soft sealing, it can avoid the consumption of ultrasonic energy transmitted to the rear end of the main shaft unit, thus ensuring the reliability of the operation of the main shaft unit.

[0046] Furthermore, on the outer periphery of the shaft core 2 along the axis, a primary side assembly 9 and a secondary side assembly 10 are relatively arranged. The primary side assembly 9 is movably arranged on the side of the secondary side assembly 10 away from the oscillator 3. An adjusting gear disk 11 is movably arranged on the outer periphery of the primary side assembly 9, which is used to drive the primary side assembly 9 to translate, and the gap between the primary side assembly 9 and the secondary side assembly 10 can be adjusted.

[0047] Specifically, the primary side assembly 9 is connected to an external ultrasonic power supply, enabling the ultrasonic power supply to provide ultrasonic energy to the main shaft unit. By driving the primary side assembly 9 to translate through the adjusting gear disk 11 and adjusting the gap between the primary side assembly 9 and the secondary side assembly 10, the power transmission efficiency between the two can be improved. A retaining ring 12 is also arranged on the inner wall of the body 1, and the retaining ring 12 is located between the adjusting gear disk 11 and the primary side assembly 9, which is used to limit the translation of the primary side assembly 9, ensure the reliability of energy transmission, and improve the transmission efficiency of ultrasonic energy.

[0048] Furthermore, a preloading adjustment assembly 13 is also arranged inside the body 1 and on the outer periphery of the shaft core 2, which is used to preload and adjust the rear bearing group 14 inside the body 1. Specifically, a front bearing group and a rear bearing group 14 are respectively arranged at the front end and the rear end of the inner cavity of the body 1 and on the outer periphery of the shaft core 2, which is used to ensure the reliability of the cooperation between the body 1 and the shaft core 2.

[0049] In an embodiment of the present utility model, referring to Figure 6 and Figure 7 as shown, the preloading adjustment assembly 13 includes a preloading block 131 and a plunger unit 132. The preloading block 131 is arranged in the inner cavity of the body 1 and on one side of the rear bearing group 14; the plunger unit 132 is arranged in the inner cavity of the preloading block 131, and the end of the plunger unit 132 abuts against the end face of the rear bearing group 14 for limitation.

[0050] Further, the plunger unit 132 includes a plunger housing 1321, an elastic element 1322, and a push rod 1323. The plunger housing 1321 is axially disposed in the installation cavity of the preloading block 131, and the elastic element 1322 is provided in the inner cavity of the plunger housing 1321. One end of the push rod 1323 is placed inside the plunger housing 1321 and abuts against the elastic element 1322, and the other end of the push rod 1323 abuts against the corresponding end face of the rear bearing group 14.

[0051] It can be understood that multiple groups of plunger units 132 can be circumferentially provided on the preloading block 131, and the end portions of the push rods 1323 of each group of plunger units 132 all abut against the corresponding end face of the rear bearing group 14, which can ensure that the preloading forces generated by the respective elastic elements 1322 are of the same magnitude.

[0052] Specifically, a threaded fit is adopted between the plunger housing 1321 and the preloading block 131, which is convenient for installation and cooperation, and also convenient for adjusting the axial positional relationship between the plunger housing 1321 and the preloading block 131.

[0053] Further, the end surface of the push rod 1323 that abuts and cooperates with the rear bearing group 14 adopts an arc surface, which can ensure that the acting point and the acting line on the rear bearing group 14 are on the same straight line. In this way, it is not necessary to closely adhere to the outer ring of the rear bearing group 14, and the push rod 1323 can directly act on the outer ring end face of the rear bearing group 14, with a simple structure and improved working efficiency of the preloading adjustment assembly 13.

[0054] Further, the axial dimension of the preloading block 131 near the inner circumference of the shaft core 2 is smaller than the axial dimension of the outer circumference. The plunger unit 132 is provided at the end of the preloading block 131 away from the shaft core 2, which can reduce the volume of the preloading block 131, and can avoid interference with the primary side assembly 9, ensuring the reliability of power transmission between the primary side assembly 9 and the secondary side assembly 10, and also ensuring reliable preloading cooperation between the plunger unit 132 and the rear bearing group 14.

[0055] It can be understood that the preloading adjustment assembly 13 further includes a fixing member 134 connecting the preloading block 131 and the body 1. After the preloading adjustment of the rear bearing group 14 is in place, the fixing member 134 axially positions the preloading block 131 to ensure the reliability of the operation of the preloading adjustment assembly 13.

[0056] In other embodiments, referring to Figure 8 As shown, the preloading adjustment assembly 13 includes a retaining ring 135, an elastic member 136, and an adjusting block 137. The retaining ring 135 and the adjusting block 137 are oppositely arranged along the axial direction of the shaft core 2. The retaining ring 135 abuts against the end face of the rear bearing group 14, and multiple groups of elastic members 136 are arranged between the retaining ring 135 and the adjusting block 137 to achieve the preloading effect on the rear bearing group 14.

[0057] Specifically, the retaining ring 135 is movably arranged on the outer periphery of the shaft core 2, the adjusting block 137 is fixed on the outer periphery of the shaft core 2, the first limiting hole and the second limiting hole are respectively arranged on the opposite side surfaces of the retaining ring 135 and the adjusting block 137, and the two ends of the elastic member 52 are respectively matched with the first limiting hole and the second limiting hole.

[0058] Specifically, the rear end cover 17 and the retaining ring 135 are arranged on the opposite sides of the rear bearing group 14, and the end face of the rear bearing group 14 can be pre-tightened and limited through multiple groups of elastic members 136. Multiple groups of first limiting holes and second limiting holes are respectively and evenly arranged in the circumferential directions of the retaining ring 135 and the adjusting block 137, and multiple groups of elastic members 136 are correspondingly arranged for installation and cooperation, so that multiple groups of elastic members 136 can be accommodated, and the height, compression amount and contact area of each group of elastic members 136 can be the same, thereby ensuring the uniform pre-tightening force of multiple groups of elastic members 136.

[0059] Further, the inner wall of the central hole of the tool clamping disc 5 extends along the radial direction and the axial direction in sequence to form a tool clamping key 52 ( Figure 5 as shown in), and is sleeved on the outer periphery of the tool shank 4 through the central hole. The tool clamping part 521 of the tool clamping key 52 is arranged in the direction away from the shaft core 2, and the tool clamping part 521 of the tool clamping key 52 is in limit cooperation with the tool clamping groove on the outer periphery of the tool shank 4, which is convenient for tool clamping cooperation, and the installation is reliable and stable.

[0060] Specifically, two tool clamping keys 52 are arranged oppositely, or according to actual needs, multiple tool clamping keys 52 are arranged along the circumferential direction of the tool clamping disc 5, which is convenient for ensuring the stable installation of the tool shank 4 and further ensuring the reliability of the tool shank 4 during operation.

[0061] Further, referring to Figure 9 and 10 as shown, the main shaft unit further includes an air cleaning assembly 15, the air cleaning assembly 15 is arranged between the main body 1 and the tool clamping mechanism 16 at the rear end of the main shaft unit, and is used for air cleaning the front end of the main shaft unit during mechanical tool clamping; an air cleaning channel is formed between the air cleaning assembly 15 and the tool clamping mechanism 16, and the air cleaning channel is sequentially communicated with the inner cavity of the pull rod 7 and the inner cavity of the vibrator 3.

[0062] The air cleaning assembly 15 includes a cleaning column 151, a piston 152 and a spring 153. One end of the cleaning column 151 is connected to the end of the main body 1, and the other end corresponds to the tool clamping disc 161 of the tool clamping mechanism 16; an air storage cavity communicated with the air cleaning channel is arranged on the cleaning column 151, a spring 152 is arranged in the air storage cavity, and a piston 153 acting on the spring 152 is movably arranged; one end of the piston 153 abuts against the spring 152, and the other end is in cooperation with the tool clamping disc 161.

[0063] Specifically, the piston 152 is provided with a through hole communicating with the air storage cavity. When the tool hitting mechanism 16 moves during mechanical tool hitting, the tool hitting disc 161 abuts against the piston 153 and compresses the spring 152. At this time, the through hole on the piston 152 communicates with the air cleaning channel, and the gas in the air storage cavity sequentially passes through the through hole of the piston 152 and the air cleaning channel, enters the inner cavity of the pull rod 7 and then enters the installation cavity of the oscillator 3, that is, the installation cavity of the oscillator 3 is air-cleaned, ensuring the reliability of the installation of the tool holder 4.

[0064] Further, referring to Figure 8 As shown in the figure, a liquid storage groove 101 is circumferentially provided along the outer periphery of the main body 1, and a cooling channel 102 communicating with the liquid storage groove 101 is provided, which is used to introduce a cooling medium to cool the whole spindle unit, ensuring the reliability of the whole spindle unit during operation.

[0065] Specifically, the liquid storage groove 101 can adopt an annular structure and be provided with multiple channels along the axial direction of the main body 1, or can adopt a spiral structure, both of which can realize the flow of the cooling medium along the liquid storage groove 101 to cool the whole spindle unit. To facilitate the introduction of the cooling medium, a nozzle 61 is provided on the front flange 6, and the front flange 6 is sealed with the cooling channel 102 of the main body 1, further ensuring the reliability of the introduction of the cooling medium.

[0066] In the present utility model, an air inlet 103 is further provided on the main body 1, and a blowing ring 104 is provided, which is used to introduce gas to perform airtight sealing between the shaft core 2 and the main body 1. Sealing structures are also respectively provided at the front end and the tail end of the spindle unit, which can effectively prevent impurities from entering the main body 1, ensuring the reliability of the operation of the front bearing group and the rear bearing group 14.

[0067] In the present utility model, the tool clamping disc 5 is directly fixedly connected to the shaft core 2, reducing the difficulty of assembling the oscillator flange and the tool clamping disc 5 and then with the shaft core 2. The connecting flange 31 of the oscillator 3 is embedded in the inner cavity of the shaft core 2, which can improve the stiffness at the connection between the oscillator 3 and the shaft core 2, thereby improving the overall rigidity and structural accuracy of the spindle, and further improving the working efficiency of the spindle.

[0068] The above embodiments are the preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.

Claims

1. An ultrasonic spindle unit, characterized in that: It comprises a body and an axis core arranged in the body, wherein the inner cavity at the end of the axis core accommodates a vibrator, the inner cavity of the vibrator is provided with a tool handle, and the inner cavity of the axis core is provided with a pull rod matched with the tool handle; A knife clamping disc is provided on the outer periphery of the knife handle, and the middle part of the knife clamping disc is limitedly matched with the knife handle; the side of the knife clamping disc extends axially to form a mounting boss or a mounting recess, and the mounting boss or the mounting recess is connected and matched with the side surface corresponding to the shaft core, and is located in the inner cavity at the end of the body.

2. The ultrasonic spindle unit according to claim 1, characterized in that: The end of the connecting flange on the vibrator abuts against the inner wall of the shaft core, and the opposite ends of the connecting flange extend axially to form a first connecting part and a second connecting part, the first connecting part abuts against the side surface corresponding to the knife disc, and the second connecting part abuts against the inner wall of the shaft core.

3. The ultrasonic spindle unit according to claim 1, characterized in that: A sealing ring is arranged between the outer periphery of the vibrator and the matching surface of the shaft core, which is used for axial sealing or radial sealing between the vibrator and the shaft core.

4. The ultrasonic spindle unit according to claim 1, characterized in that: A primary component and a secondary component are axially arranged on the outer periphery of the shaft core, and the primary component is movably arranged on the side of the secondary component away from the vibrator; an adjusting gear disc is movably arranged on the outer periphery of the primary component for adjusting the gap between the primary component and the secondary component.

5. The ultrasonic spindle unit according to claim 1, characterized in that: A preload adjustment component is also provided in the body and on the outer periphery of the shaft core, which is used to perform preload adjustment on the rear bearing group in the body.

6. The ultrasonic spindle unit according to claim 5, characterized in that: The preload adjustment assembly comprises a preload block and a plunger unit, wherein the preload block is arranged in the inner cavity of the body and located on one side of the rear bearing assembly; The plunger unit includes a plunger housing, an elastic element, and a push rod arranged in the preload block. The inner cavity of the plunger housing is provided with an elastic element; one end of the push rod is placed in the plunger housing and abuts against the elastic element, and the other end of the push rod abuts against the end face corresponding to the rear bearing group.

7. The ultrasonic spindle unit according to claim 5, characterized in that: The preload adjustment assembly includes a retaining ring, an elastic member, and an adjustment block. The retaining ring and the adjustment block are arranged relatively along the axial direction of the shaft core. The retaining ring abuts against the end surface of the rear bearing group. Multiple groups of elastic members are arranged between the retaining ring and the adjustment block.

8. The ultrasonic spindle unit according to any one of claims 1 to 7, characterized in that: It also includes an air cleaning component, which is arranged between the main body and the knife-beating mechanism at the rear end of the spindle unit, and is used to perform air cleaning on the front end of the spindle unit; an air cleaning channel is formed between the air cleaning component and the knife-beating mechanism, and the air cleaning channel is connected to the inner cavity of the pull rod and the inner cavity of the vibrator in sequence.

9. The ultrasonic spindle unit according to claim 8, characterized in that: The air cleaning assembly includes a cleaning column, a piston, and a spring. One end of the cleaning column is connected to the end of the body, and the other end corresponds to the position of the knife disc of the knife-beating mechanism. An air storage chamber is provided on the cleaning column, and a spring is provided in the air storage chamber, and a piston is movably provided to act on the spring. One end of the piston abuts against the spring, and the other end cooperates with the knife disc.

10. The ultrasonic spindle unit according to claim 1 or 9, characterized in that: The outer periphery of the body is provided with a liquid storage tank along the circumferential direction, and a cooling channel communicated with the liquid storage tank is provided, which is used for passing a cooling medium to cool the spindle unit.

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