An ultrasonic spindle

Abstract

The present application discloses an ultrasonic spindle, which includes a rotary joint, a rear seat and a rear cover sleeved on the rotary joint, at least one airtight flow channel and a liquid discharge device; there is a cavity between the rear seat and the rear cover, and an assembly gap is provided between the rear seat and the rotary joint, and the assembly gap communicates with the cavity; the airtight flow channel is arranged in the rear seat, with one end communicating with the assembly gap and the other end connected to an external air source; one end of the liquid discharge device communicates with the cavity, and the other end passes through the rear seat and extends outside the rear seat. The gas supplied by the external air source to the airtight flow channel can enter the cavity, so as to blow the cutting fluid adhering in the cavity to the liquid discharge device, and be discharged to the outside of the ultrasonic spindle through the liquid discharge device, reducing the amount of cutting fluid in the cavity, thereby reducing the pollution inside the ultrasonic spindle and lowering the incidence of damage to the ultrasonic spindle.

Description

Technical Field

[0001] The present application relates to the technical field of spindles, and in particular to an ultrasonic spindle. Background Art

[0002] Currently, deep-hole drilling processes in difficult-to-machine materials in the machining industry require higher ultrasonic spindle speeds, as well as central water flow for tool cooling and chip removal. To increase the speed of central-flow ultrasonic spindles, existing technologies employ bearingless rotary joints with central water flow. However, these rotary joints are prone to leaking cutting fluid into the ultrasonic spindle during the momentary introduction of cutting fluid or when insufficient water pressure is present, leading to contamination and even spindle failure.

[0003] like Figure 1 As shown, the rotary joint 100 of the existing ultrasonic main shaft includes a coaxially arranged connecting rod 111, a rotating rod 112, and a pressure rod 113; the connecting rod 111, the rotating rod 112, and the pressure rod 113 are all hollow structures, thus forming a central water outlet type rotary joint. The connecting rod 111 is connected to the rotating rod 112, and the connecting rod 111 is used to be assembled on the main shaft rotating component to drive the rotating rod 112 to rotate under the drive of the main shaft rotating component. The rotating rod 112 is covered with a rear seat 200 and a rear cover 300. The rear seat 200 is connected to the rear cover 300, and a cavity 400 is formed between the rear seat 200 and the rear cover 300; the rear cover 300 is also provided with a housing 500, which is mounted on the pressure rod 113 and positions the pressure rod 113. Among them, the connecting rod 111 and the rotating rod 112 are rotating parts, and the rear seat 200, the rear cover 300, and the housing 500 are fixed parts.

[0004] When cutting fluid is introduced into the pressure rod 113, the pressure of the cutting fluid causes the pressure rod 113 to slide along the axial direction of the housing 500 and to contact the rotating rod 112. During this process, a small amount of cutting fluid will inevitably overflow from the gap 600 between the pressure rod 113 and the rotating rod 112, and the overflowed cutting fluid will spill into the cavity 400 and may move downward along the assembly gap 700 between the rear seat 200 and the rotating rod 112 (as shown in FIG. Figure 1 and Figure 2 shown).

[0005] Therefore, the existing technology still needs to be improved and developed.

[0006] Application Contents

[0007] The technical problem to be solved by the present application is to provide an ultrasonic spindle in response to the above-mentioned defects of the prior art, aiming to reduce the amount of cutting fluid attached to the ultrasonic spindle.

[0008] The technical solutions adopted by this application to solve the technical problems are as follows:

[0009] An ultrasonic spindle, which includes a rotary joint, a rear seat sleeved on the rotary joint, and a rear cover. There is a cavity between the rear seat and the rear cover. An assembly gap is provided between the rear seat and the rotary joint, and the assembly gap communicates with the cavity. It further includes:

[0010] At least one airtight flow channel, which is arranged in the rear seat, and one end thereof communicates with the assembly gap, and the other end is connected to an external air source;

[0011] A liquid drainage device, one end of which communicates with the cavity, and the other end passes through the rear seat and extends outside the rear seat.

[0012] For the ultrasonic spindle, one end of the airtight flow channel away from the assembly gap extends to the outer surface of the rear seat.

[0013] The ultrasonic spindle further includes:

[0014] A plug, which is detachably connected to one end of the airtight flow channel away from the assembly gap;

[0015] An airtight main flow channel, which is connected to an external air source and is distributed in the rear cover and the rear seat;

[0016] The airtight main flow channel intersects and communicates with the airtight flow channel, and the intersection point of the two is located between the plug and the assembly gap.

[0017] The ultrasonic spindle further includes:

[0018] A first annular boss, which is located in the assembly gap and is connected to the rear seat;

[0019] A second annular boss, which is located in the assembly gap and is connected to the rear seat;

[0020] The height of the first annular boss is less than the height of the second annular boss, and the first annular boss is located on the side of the airtight flow channel close to the cavity, and the second annular boss is located on the side of the airtight flow channel away from the cavity.

[0021] The ultrasonic spindle further includes:[[ID=********]] [[ID=********]]

[0022] A waterproof cover, which is sleeved on the rotary joint and is located in the cavity;

[0023] The waterproof cover is connected to the rear seat, and there is a gap between the waterproof cover and the rotary joint;

[0024] A plurality of exhaust holes are provided on the waterproof cover, and the plurality of exhaust holes are sequentially distributed along the circumferential direction of the waterproof cover; one end of the exhaust hole communicates with the central hole of the waterproof cover, and the other end communicates with the cavity.

[0025] The ultrasonic spindle, wherein the waterproof cover is respectively in contact with the rear seat and the first annular boss.

[0026] The ultrasonic spindle, wherein the waterproof cover is a cylindrical waterproof cover.

[0027] The ultrasonic spindle further includes:

[0028] An annular flow guiding surface, arranged on a side of the waterproof cover away from the rear seat;

[0029] Along the axial direction of the waterproof cover, a diameter of an end of the annular flow guiding surface away from the rear seat is smaller than a diameter of an end of the annular flow guiding surface close to the rear seat.

[0030] The ultrasonic spindle further includes:

[0031] An annular liquid collecting groove, arranged on the rear seat and having an opening; the opening is communicated with the cavity.

[0032] The ultrasonic spindle, wherein a liquid discharge hole is arranged on the rear seat, and the bottom of the annular liquid collecting groove is communicated with the liquid discharge hole; the liquid discharge device includes:

[0033] A liquid discharge joint, arranged in the liquid discharge hole, and one end thereof is communicated with the bottom of the annular liquid collecting groove, and the other end is vacant;

[0034] A liquid discharge pipe, one end of which is detachably connected to the vacant end of the liquid discharge joint, and the other end extends outside the rear seat.

[0035] Advantageous effects: By adding the airtight flow channel in the present application, and the airtight flow channel is communicated with the cavity through the assembly gap, compressed gas supplied from an external air source to the airtight flow channel can enter the cavity, so as to blow the cutting fluid adhering in the cavity. The present application also adds the liquid discharge device, and after the rotary joint is connected to the spindle rotating component, the liquid discharge device can be placed below the cavity, so that the cutting fluid in the cavity can be concentrated on the liquid discharge device after being blown, and then discharged outside the ultrasonic spindle through the liquid discharge device, reducing the amount of cutting fluid in the cavity, thereby reducing the pollution inside the ultrasonic spindle and lowering the incidence of damage to the ultrasonic spindle. Description of the Drawings

[0036] Figure 1 is an overall cross-sectional view of an ultrasonic spindle along the axial direction in the prior art;

[0037] Figure 2 is an overall cross-sectional view of an ultrasonic spindle along the radial direction from the assembly gap in the prior art;

[0038] Figure 3is the first cross-sectional view along the axial direction of the ultrasonic spindle in this application;

[0039] Figure 4 is the second cross-sectional view along the axial direction of the ultrasonic spindle in this application;

[0040] Figure 5 is the third cross-sectional view along the axial direction of the ultrasonic spindle in this application;

[0041] Figure 6 is the distribution schematic diagram of the airtight flow channel and the waterproof cover around the rotary joint in this application;

[0042] Figure 7 is the cross-sectional view along the radial direction of the ultrasonic spindle in this application;

[0043] Figure 8 is the structural schematic diagram of the waterproof cover in this application;

[0044] Figure 9 is the assembly schematic diagram of the cylindrical waterproof cover on the rotary rod in this application. Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of this application clearer and more definite, the following further elaborates on this application by way of examples with reference to the accompanying drawings. It should be understood that the specific examples described herein are only used to explain this application and are not used to limit this application.

[0046] Please also refer to Figures 1 - 9 . This application provides an ultrasonic spindle. As shown in Figure 3 , Figure 4 , Figure 5 and Figure 7 , the ultrasonic spindle includes a rotary joint 1, a rear seat 2, a rear cover 3, at least one airtight flow channel 4 and a liquid drainage device 5. The rear seat 2 and the rear cover 3 are both sleeved on the rotary joint 1, and there is a cavity 6 between the rear seat 2 and the rear cover 3; since the rotary joint 1 is a rotating part, an assembly gap 7 is reserved between the rear seat 2 and the rotary joint 1. The assembly gap 7 communicates with the cavity 6, and both the cavity 6 and the assembly gap 7 are closed-loop structures. Specifically, the assembly gap 7 is located between the rear seat 2 and the rotary rod 101 of the rotary joint 1.

[0047] The airtight flow channel 4 is arranged in the rear seat 2, and one end communicates with the assembly gap 7 and the other end is connected to an external air source; the external air source is used to provide compressed gas for the airtight flow channel 4. One end of the liquid drainage device 5 communicates with the cavity 6, and the other end passes through the rear seat 2 and extends outside the rear seat 2.

[0048] When the ultrasonic spindle is started, the external air source is synchronously turned on. After the compressed gas passes through the airtight flow channel 4 and the assembly gap 7 in sequence, part of it enters the cavity 6, thereby flushing the cutting fluid adhering to the cavity 6. Since the rear seat 2 faces downward and the rear cover 3 faces upward after the rotary joint 1 is connected to the spindle rotating component; and the liquid discharge device 5 is located on the side of the rear seat 2, that is, the liquid discharge device 5 is located below the cavity 6, so that part of the cutting fluid in the cavity 6 can be concentrated on the liquid discharge device 5 under the flushing action of the compressed gas and is discharged outside the ultrasonic spindle through the liquid discharge device 5, reducing the amount of cutting fluid in the cavity 6, thereby reducing the pollution inside the ultrasonic spindle and lowering the incidence of damage to the ultrasonic spindle.

[0049] Compared with the prior art, in this application, by adding the airtight flow channel 4, and the airtight flow channel 4 is communicated with the cavity 6 through the assembly gap 7, the compressed gas supplied by the external air source to the airtight flow channel 4 can enter the cavity 6, thereby flushing the cutting fluid adhering to the cavity 6. This application also adds the liquid discharge device 5, and after the rotary joint 1 is connected to the spindle rotating component, the liquid discharge device 5 can be placed below the cavity 6, so that the cutting fluid in the cavity 6 can be concentrated on the liquid discharge device 5 after being flushed, and then is discharged outside the ultrasonic spindle through the liquid discharge device 5. Therefore, in this application, by flushing the cutting fluid adhering to the cavity 6, part of the cutting fluid is concentrated on the liquid discharge device 5 and then discharged outside the ultrasonic spindle through the liquid discharge device 5, reducing the amount of cutting fluid in the cavity 6, thereby reducing the pollution inside the ultrasonic spindle and lowering the incidence of damage to the ultrasonic spindle.

[0050] Since after the rotary joint 1 is assembled with the spindle rotating component, the axial direction of the rotary joint 1 is vertically arranged, and the rear seat 2 is located below the cavity 6, the cutting fluid in the cavity 6 generally adheres to the side wall of the rotary rod 101 corresponding to the cavity 6, the side wall of the rear seat 2 facing the cavity 6, and even continues to move downward along the assembly gap 7; therefore, in this application, the position advantage of the assembly gap 7 during the operation of the ultrasonic spindle is utilized: the assembly gap 7 is located below the cavity 6 and close to the side wall of the rotary rod 101 corresponding to the cavity 6, and the airtight flow channel 4 is used to provide an upward blowing force for the assembly gap 7, so that most of the compressed gas can reach the side wall of the rotary rod 101 corresponding to the cavity 6 and the side wall of the rear seat 2 facing the cavity 6, thereby flushing the cutting fluid adhering to these two positions and making the cutting fluid concentrate on the liquid discharge device 5. In addition, since the compressed gas blows into the cavity 6 located above through the assembly gap 7, the compressed gas can effectively prevent the cutting fluid from continuing to move downward along the side wall of the rotary rod 101 through the assembly gap 7.

[0051] Therefore, compared with the prior art, in the present application, not only by adding the airtight flow channel 4 and the liquid drainage device 5, the cutting fluid accumulated in the cavity 6 is drained outside the ultrasonic spindle to achieve the purpose of reducing the pollution of the ultrasonic spindle; but also by designing the position of the airtight flow channel 4, reducing the diffusion and downward movement of the cutting fluid inside the ultrasonic spindle, to achieve the purpose of reducing the pollution of the ultrasonic spindle.

[0052] As Figure 7 shown, the airtight flow channel 4 penetrates through the rear seat 2 along the radial direction of the rear seat 2, so as to communicate with the assembly gap 7; after the compressed gas passes through the airtight flow channel 4 and enters the annular assembly gap 7, an air flow surrounding the rotating rod 101 is formed.

[0053] Embodiment 1 in the present application

[0054] The airtight flow channel 4 is arranged independently. Specifically, one end of the airtight flow channel 4 far from the assembly gap 7 extends to the outer surface of the rear seat 2 and is directly connected to an external air source, so as to supply air to the airtight flow channel 4 directly through the external air source.

[0055] Embodiment 2 in the present application

[0056] As Figure 4 and Figure 7 shown, the ultrasonic spindle further includes a plug 8 and an airtight main flow channel 9. The plug 8 is detachably connected to one end of the airtight flow channel 4 far from the assembly gap 7; the airtight main flow channel 9 is connected to an external air source; the airtight main flow channel 9 is distributed in the rear cover 3 and the rear seat 2 and extends along the axial direction of the ultrasonic spindle to the front end of the ultrasonic spindle (the end of the ultrasonic spindle far from the spindle rotating component), so as to supply compressed gas to the front end of the ultrasonic spindle for airtight protection and prevent the cutting fluid from entering the inside of the ultrasonic spindle from the front end of the ultrasonic spindle. Among them, the airtight main flow channel 9 has the same structure as the airtight main flow channel 9 in the ultrasonic spindle structure in the prior art (the airtight main flow channel 800 in the prior art is as Figure 2 shown).

[0057] In this embodiment, the airtight main flow channel 9 intersects and communicates with the airtight flow channel 4, and the intersection point of the airtight main flow channel 9 and the airtight flow channel 4 is located between the plug 8 and the assembly gap 7. Initially, the plug 8 is connected to one end of the airtight flow channel 4 far from the assembly gap 7.

[0058] In one implementation of this embodiment, the airtight flow channel 4 is used in dependence on the airtight main flow channel 9, that is, the airtight flow channel 4 is connected to an external air source through the airtight main flow channel 9. Only when gas is introduced into the airtight main flow channel 9 can the airtight flow channel 4 supply gas to the assembly gap 7. Specifically, the airtight main flow channel 9 is connected to an external air source, and the plug 8 is always located within the airtight flow channel 4.

[0059] In another implementation of this embodiment, the airtight flow channel 4 can also be used independently. Specifically, remove the plug 8 and directly connect the end of the airtight flow channel 4 far from the assembly gap 7 to an external air source; after the ultrasonic spindle and the spindle rotating component are assembled, start the spindle rotating component and the external air source synchronously. Compressed gas can effectively blow the cutting fluid through the assembly gap 7, so that the cutting fluid is discharged outside the ultrasonic spindle through the liquid discharge device 5.

[0060] As Figure 6 shown, the ultrasonic spindle further includes a first annular boss 10 and a second annular boss 11. Both the first annular boss 10 and the second annular boss 11 are located within the assembly gap 7 and are both connected to the rear seat 2. The first annular boss 10 is located on the side of the airtight flow channel 4 close to the cavity 6, and the second annular boss 11 is located on the side of the airtight flow channel 4 far from the cavity 6; and the height of the first annular boss 10 is less than the height of the second annular boss 11, so that when compressed gas is introduced into the airtight flow channel 4, the air pressure at the position close to the first annular boss 10 within the assembly gap 7 is less than the air pressure at the position close to the second annular boss 11, so that most of the compressed gas conveyed by the airtight flow channel 4 to the assembly gap 7 can travel in the direction of the first annular boss 10, that is, the amount of compressed gas blown towards the cavity 6 is increased; the following purposes are achieved: enhancing the blowing effect of the compressed gas on the cutting fluid within the cavity 6 and effectively preventing the cutting fluid within the cavity 6 from moving along the assembly gap 7 towards the front end of the ultrasonic spindle.

[0061] Since the cutting fluid inside the ultrasonic spindle is mainly concentrated in the cavity 6, in this application, by setting the first annular boss 10 and the second annular boss 11 with inconsistent heights, the air pressure distribution within the assembly gap 7 is changed, so that the air pressure on the side of the assembly gap 7 close to the cavity 6 is low and the air pressure on the side far from the cavity 6 is high, thereby increasing the amount of compressed gas entering the cavity 6, enhancing the blowing effect of the compressed gas on the cutting fluid adhering to the inner wall of the cavity 6, and increasing the content of the cutting fluid concentrated in the liquid discharge device 5.

[0062] In an embodiment of the present application, the first annular boss 10 and the second annular boss 11 are arranged at both ends of the assembly gap 7 along the radial direction of the rotating rod 101, such that the distance between the first annular boss 10 and the second annular boss 11 reaches the maximum along the radial direction of the rotating rod 101, thereby achieving: the adjustment of the air pressure in the assembly gap 7 by the first annular boss 10 and the second annular boss 11 is optimal, and further improving the effect of blowing the cutting fluid into the liquid discharge device 5 through the assembly gap 7 by the compressed gas.

[0063] As Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 9 shown, the ultrasonic spindle further includes a waterproof cover 12. The waterproof cover 12 is sleeved on the rotating rod 101 and is located in the cavity 6; the waterproof cover 12 is connected to the rear seat 2. The inner diameter of the waterproof cover 12 is larger than the outer diameter of the rotating rod 101, so that there is a gap 120 between the waterproof cover 12 and the rotating rod 101, thereby avoiding adverse interference of the waterproof cover 12 on the rotation of the rotating rod 101. Since the waterproof cover 12 is located in the cavity 6 and is connected to the rear seat 2, along the axial direction of the rotating rod 101, the gap 120 can communicate with the cavity 6 and the assembly gap 7 respectively.

[0064] As Figure 6 and Figure 8 shown, a plurality of exhaust holes 13 are provided on the waterproof cover 12. The plurality of exhaust holes 13 are arranged at intervals in sequence along the circumferential direction of the waterproof cover 12. One end of the exhaust hole 13 is communicated with the central hole of the waterproof cover 12, and the other end is communicated with the cavity 6, so that the gap 120 is communicated with the cavity 6 through the exhaust hole 13. When compressed gas is introduced into the airtight flow channel 4, part of the compressed gas passes through the assembly gap 7 and the gap 120, and enters the cavity 6 from the exhaust hole 13; the exhaust hole 13 is used to increase the pressure of the compressed gas blown from the gap 120 into the cavity 6, so that the compressed gas enters the cavity 6 in a jet shape, thereby improving the blowing effect of the compressed gas on the cutting fluid in the cavity 6 and increasing the liquid inflow of the cutting fluid in the cavity 6 into the liquid discharge device 5.

[0065] The waterproof cover 12 is respectively fitted with the rear seat 2 and the first annular boss 10, so that along the radial direction of the waterproof cover 12, the compressed gas can only enter the cavity 6 through the exhaust hole 13, further increasing the pressure of the compressed gas blowing from the gap 120 into the cavity 6, and enhancing the blowing effect of the compressed gas on the side wall of the rear seat 2 corresponding to the cavity 6, effectively reducing the amount of cutting fluid attached to the side wall of the rear seat 2 corresponding to the cavity 6.

[0066] A small amount of compressed gas is blown from the gap 120 toward the rear end of the ultrasonic spindle along the axial direction of the rotating rod 101, thereby effectively preventing the cutting fluid flowing toward the waterproof cover 12 from continuing to flow toward the front end of the ultrasonic spindle.

[0067] In one embodiment of this application, Figure 9 As shown, the waterproof cover 12 is a cylindrical waterproof cover, that is, the two end faces of the waterproof cover 12 along the axial direction are both flat; when the ultrasonic main shaft and the main shaft rotating component are assembled and used, the two end faces of the waterproof cover 12 along the axial direction are arranged up and down, and the end face located on the upper side is arranged horizontally.

[0068] like Figure 4 、 Figure 6 and Figure 8 As shown, the ultrasonic main shaft further includes an annular guide surface 14, which is provided on the side of the waterproof cover 12 away from the rear seat 2. Along the axial direction of the waterproof cover 12, the diameter of the annular guide surface 14 at the end away from the rear seat 2 is smaller than the diameter at the end close to the rear seat 2, that is, the diameter of the annular guide surface 14 at the end close to the rear seat 2 is larger, and the diameter of the end away from the rear seat 2 is smaller.

[0069] The annular guide surface 14 is used to guide the cutting fluid in the cavity 6. Specifically, the cutting fluid in the cavity 6 flows from top to bottom along the side wall of the rotating rod 101 to the annular guide surface 14. Under the guiding action of the annular guide surface 14, the cutting fluid flows along the annular guide surface 14 to the side wall of the rear seat 2 corresponding to the cavity 6, thereby allowing the cutting fluid to enter the effective range of the compressed gas sprayed from the exhaust hole 13, thereby increasing the amount of cutting fluid entering the drainage device 5. In addition, since a small amount of compressed gas can enter the cavity 6 from the gap 120 along the radial direction of the waterproof cover 12, after this part of the compressed gas blows the cutting fluid attached to the side wall of the rotating rod 101 upward, the cutting fluid can fall to the annular guide surface 14. Under the guiding action of the annular guide surface 14, the cutting fluid enters the effective range of the compressed gas sprayed from the exhaust hole 13, thereby reducing the amount of cutting fluid attached to the side wall of the rotating rod 101 and increasing the amount of cutting fluid entering the drainage device 5.

[0070] like Figure 6 andFigure 8 As shown, a plurality of lugs 15 are provided on the waterproof cover 12, such as Figure 6 shown, the lug 15 is connected to the rear seat 2 by a screw 150.

[0071] The waterproof cover 12 includes a first annular portion 121 and a second annular portion 122. The second annular portion 122 is disposed on a radial side of the first annular portion 121 and is connected to the rear seat 2. The exhaust hole 13 is located on the second annular portion 122 and penetrates the second annular portion 122 in the radial direction of the second annular portion 122. A plurality of lugs are provided on the periphery of the second annular portion 122 and are arranged at intervals in the circumferential direction of the second annular portion 122.

[0072] The inner diameter of the second annular portion 122 is larger than the inner diameter of the first annular portion 121 and the inner diameter of the first annular boss 10, so that the volume of the gap 120 between the second annular portion 122 and the rotating rod 101 is both larger than the volume of the gap 120 between the first annular portion 121 and the rotating rod 101 and larger than the volume between the first annular boss 10 and the rotating rod 101. Thus, a gas storage space is formed between the second annular portion 122 and the rotating rod 101, improving the injection force of the compressed gas entering the cavity 6 from the exhaust hole 13.

[0073] The annular flow guiding surface 14 is located on the outer surface of the first annular portion 121, making the first annular portion 121 conical, and the large diameter end of the first annular portion 121 is connected to the second annular portion 122, and the small diameter end is away from the second annular portion 122.

[0074] As Figure 3 、 Figure 4 、 Figure 5 and Figure 9 shown, the ultrasonic spindle further includes an annular liquid collecting groove 16. The annular liquid collecting groove 16 has an opening, and the annular liquid collecting groove 16 is provided on the rear seat 2; the opening faces the cavity 6 and is thus communicated with the cavity 6. When the ultrasonic spindle works, a part of the cutting fluid flowing towards the cavity 6 can enter the annular liquid collecting groove 16, reducing the cutting fluid attached to the side wall of the rear seat 2 corresponding to the cavity 6, and thus reducing the amount of cutting fluid flowing back to the side wall of the rotating rod 101 due to the vibration of the ultrasonic spindle.

[0075] As Figure 3As shown, a liquid discharge hole 17 is provided on the rear seat 2. One end of the liquid discharge hole 17 is communicated with the cavity 6, and the other end is communicated with the outside; the bottom of the annular liquid collection groove 16 is communicated with the liquid discharge hole 17. The liquid discharge device 5 includes a liquid discharge joint 51 and a liquid discharge pipe 52; the liquid discharge joint 51 is arranged in the liquid discharge hole 17, and one end of the liquid discharge joint 51 is communicated with the bottom of the annular liquid collection groove 16, and the other end is vacant. One end of the liquid discharge pipe 52 is detachably connected to the vacant end of the liquid discharge joint 51, and the other end extends outside the rear seat 2. The cutting fluid in the annular liquid collection groove 16 is discharged outside the rear seat 2 after passing through the liquid discharge joint 51 and the liquid discharge pipe 52 in sequence.

[0076] In this application, the liquid discharge joint 51 is installed in the liquid discharge hole 17, so that the liquid discharge pipe 52 can be directly connected to the liquid discharge joint 51 to discharge the cutting fluid in the annular liquid collection groove 16. Because if the liquid discharge pipe 52 is directly connected to the annular liquid collection groove 16, there will be problems: the discharge port of the annular liquid collection groove 16 is located in the liquid discharge hole 17 and is not easy to find, and the length of the liquid discharge pipe 52 inserted into the liquid discharge hole 17 is relatively long, and it is not easy to be inserted and matched with the discharge port of the annular liquid collection groove 16. Therefore, compared with directly connecting the liquid discharge pipe 52 to the annular liquid collection groove 16, in this application, the liquid discharge pipe 52 is connected to the annular liquid collection groove 16 through the liquid discharge joint 51, reducing the length of the liquid discharge pipe 52 inserted into the liquid discharge hole 17, and making it more convenient to insert and pull out the liquid discharge pipe 52.

[0077] As Figure 5 As shown, the ultrasonic spindle further includes an induction stator 18 and a power cable 19. The induction stator 18 is sleeved on the rotary joint 1; an annular groove 20 is provided on the rear seat 2. The induction positioning is located in the annular groove 20 and is connected to the rear seat 2. A power cable through hole 21 is also provided on the rear seat 2, and the power cable through hole 21 is communicated with the annular groove 20. One end of the power cable 19 passes through the power cable through hole 21 and is connected to the induction stator 18, and the other end passes through the cavity 6 and the rear cover 3 in sequence and is connected to an external power supply.

[0078] In one embodiment of this application, a sealing glue layer is provided in the power cable through hole 21. The sealing glue layer is located between the power cable 19 and the inner wall of the power cable through hole 21, thereby sealing the assembly gap between the power cable 19 and the inner wall of the power cable through hole 21, and preventing cutting fluid from entering the power cable through hole 21 and having an adverse effect on the power cable 19.

[0079] In another embodiment of the present application, the ultrasonic spindle further includes a flexible tube 22. One end of the flexible tube 22 is inserted into the power cord through-hole 21 and is flush with the bottom of the annular groove 20; the other end sequentially passes through the cavity 6 and the rear cover 3. The power cord 19 is located inside the flexible tube 22, so as to protect the power cord 19 through the flexible tube 22 and avoid the adverse effect of cutting fluid on the power cord 19. A sealant layer is provided between the flexible tube 22 and the inner wall of the power cord through-hole 21. In one implementation manner of this embodiment, the flexible tube 22 is a silica gel tube.

[0080] In summary, the present application provides an ultrasonic spindle. By adding the airtight flow channel, and the airtight flow channel is communicated with the cavity through the assembly gap, the compressed gas supplied from the external air source to the airtight flow channel can enter the cavity, so as to blow the cutting fluid attached in the cavity. The present application also adds the liquid drainage device. After the rotary joint is connected to the spindle rotating component, the liquid drainage device can be placed below the cavity, so that the cutting fluid in the cavity can be concentrated on the liquid drainage device after being blown, and then discharged to the outside of the ultrasonic spindle through the liquid drainage device, reducing the amount of cutting fluid in the cavity, thereby reducing the pollution inside the ultrasonic spindle and lowering the incidence of damage to the ultrasonic spindle.

[0081] It should be understood that the application of the present application is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present application.

Claims

1. An ultrasonic spindle, comprising a rotary joint and a rear seat and a rear cover sleeved on the rotary joint, wherein a cavity is provided between the rear seat and the rear cover, an assembly gap is provided between the rear seat and the rotary joint, and the assembly gap is communicated with the cavity, characterized in that: It also includes: at least one airtight flow channel disposed in the rear seat, with one end communicating with the assembly gap and the other end connected to an external air source; a liquid discharge device, one end of which is in communication with the cavity and the other end of which passes through the rear seat and extends outside the rear seat; A waterproof cover is sleeved on the rotary joint and located in the cavity; The waterproof cover is connected to the rear seat, and there is a gap between the waterproof cover and the rotary joint; The waterproof cover is provided with a plurality of exhaust holes, which are distributed in sequence along the circumferential direction of the waterproof cover; one end of the exhaust hole is communicated with the central hole of the waterproof cover, and the other end is communicated with the cavity.

2. The ultrasonic spindle according to claim 1, characterized in that: One end of the airtight flow channel away from the assembly gap extends to the outer surface of the rear seat.

3. The ultrasonic spindle according to claim 2, characterized in that: It also includes: a plug detachably connected to an end of the airtight flow channel away from the assembly gap; an airtight main flow channel connected to an external air source and distributed within the rear cover and the rear seat; The airtight main channel and the airtight flow channel are cross-connected, and a cross-connection point between the two is located between the plug and the assembly gap.

4. The ultrasonic spindle according to claim 1, characterized in that: It also includes: a first annular boss, located in the assembly gap and connected to the rear seat; a second annular boss, located in the assembly gap and connected to the rear seat; The height of the first annular boss is smaller than that of the second annular boss, and the first annular boss is located on a side of the airtight flow channel close to the cavity, while the second annular boss is located on a side of the airtight flow channel away from the cavity.

5. The ultrasonic spindle according to claim 4, characterized in that: The waterproof cover is respectively fitted with the rear seat and the first annular boss.

6. The ultrasonic spindle according to claim 1, characterized in that: The waterproof cover is a cylindrical waterproof cover.

7. The ultrasonic spindle according to claim 1, characterized in that: It also includes: an annular guide surface, provided on a side of the waterproof cover away from the rear seat; Along the axial direction of the waterproof cover, the diameter of the annular guide surface at the end away from the rear seat is smaller than the diameter of the end close to the rear seat.

8. The ultrasonic spindle according to claim 1, characterized in that: It also includes: An annular liquid collecting tank is arranged on the rear seat and has an opening; the opening is communicated with the cavity.

9. The ultrasonic spindle according to claim 8, characterized in that: The rear seat is provided with a drainage hole, and the bottom of the annular liquid collecting tank is connected to the drainage hole; the drainage device includes: A drainage connector is provided in the drainage hole, with one end connected to the bottom of the annular liquid collecting tank and the other end being empty; A liquid discharge pipe has one end detachably connected to the idle end of the liquid discharge joint and the other end extending to the outside of the rear seat.

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