Main shaft and swing head

Abstract

The application discloses a main shaft and a swing head, which comprise a shell, an end cover covering one end of the shell, a mandrel arranged in the shell, a broach mechanism comprising a broach assembly and a pushing assembly, the pushing assembly pushing the broach assembly to clamp or release a tool, and a cooling assembly comprising a water inlet pipeline, a first water outlet pipeline and a second water outlet pipeline, the water inlet pipeline being connected with a water tank and penetrating through the shell and the end cover to extend into the broach assembly, the first water outlet pipeline being communicated with the water inlet pipeline and the broach assembly, and one end of the second water outlet pipeline being communicated with the water inlet pipeline and the other end of the second water outlet pipeline penetrating through the broach assembly and the end cover in a direction opposite to the water inlet pipeline to extend out of the shell and be connected with the water tank. The application forms an effective cooling circulation system in the main shaft, the first water outlet pipeline directly penetrating through the broach assembly so that liquid in the first water outlet pipeline can directly reach the tool to cool the tool. The second water outlet pipeline flows reversely through the outside of the shell and can take away heat at the rear end of the main shaft to reduce the risk of increasing heat extension.

Description

Technical Field

[0001] This invention relates to the field of spindle technology, and in particular to a spindle and a oscillating head. Background Technology

[0002] When existing spindles have a center-out cooling function, a center-out cooling rotary joint is usually installed above the spindle, and a center-out cooling tool is mounted on the spindle. The cutting fluid flows into the spindle mandrel through the rotary joint to achieve the center-out cooling effect. However, when the center-out cooling tool is not in use, the rotary joint is in a dry-running state, which can lead to damage to the rotary joint after prolonged operation. In addition, there is no internal cooling effect inside the spindle, resulting in increased thermal expansion. Summary of the Invention

[0003] The main technical problem this application addresses is to provide a spindle and oscillating head that solves the problem of increased thermal expansion due to the lack of internal cooling in the spindle.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution: A spindle is provided, comprising: a housing, a hollow cavity open at both ends; an end cap, sealing one end of the housing; a mandrel rotatably disposed within the housing, the mandrel having an axial hole; a broaching mechanism, including a broaching assembly and a pushing assembly, the broaching assembly being disposed in the axial hole for mounting a cutting tool, the pushing assembly being connected between the housing and the end cap, and the pushing assembly being configured to push the broaching assembly to move axially along the mandrel to a first position to clamp the cutting tool, or to move it to a second position to release the cutting tool; and a cooling assembly. The component includes an inlet pipe, a first outlet pipe, and a second outlet pipe. The inlet pipe is used to connect to a water tank and passes through the housing and the end cap in sequence to extend into the cutter assembly. One end of the first outlet pipe is connected to the inlet pipe, and the other end passes through the cutter assembly. A first valve body is provided between the first outlet pipe and the inlet pipe. One end of the second outlet pipe is connected to the inlet pipe, and the other end passes through the cutter assembly and the end cap in the opposite direction to the inlet pipe in sequence to extend out of the housing and connect to the water tank. A second valve body is provided at the end of the second outlet pipe.

[0005] The broach assembly includes: a broach rod, telescopically disposed within the axial hole along the extension direction of the mandrel; a puller claw connected to one end of the broach rod and used to clamp or release the tool; a retaining sleeve disposed at the end of the broach rod away from the puller claw, and the retaining sleeve having a receiving groove on the side facing the broach rod; a rotating shaft rotatably disposed within the receiving groove, and the rotating shaft being fixedly connected to the broach rod; and a tool-removing shaft, one end of which is connected to the end of the retaining sleeve away from the broach rod, and the other end being slidably disposed within the retaining groove. Connected to the end cap, the pushing assembly is configured to push the cutting shaft; wherein, the water inlet pipe passes sequentially through the housing, the end cap, and the cutting shaft to extend into the fixed sleeve, one end of the first water outlet pipe is connected to the water inlet pipe, and the other end passes sequentially through the rotating shaft, the cutting rod, and the pull claw, one end of the second water outlet pipe is connected to the water inlet pipe, and the other end passes sequentially through the fixed sleeve, the cutting shaft, and the end cap in the opposite direction to the water inlet pipe to extend out of the housing.

[0006] The axial hole has a first hole and a second hole that are connected. The diameter of the second hole is larger than the diameter of the first hole. One end of the puller rod extends into the first hole to connect to the pull claw, and the other end is located in the second hole. A support block is provided on the outer side wall of the end of the puller rod near the fixed sleeve. The puller assembly also includes a first elastic part, which is disposed in the second hole and elastically abuts against the support block and the hole wall of the second hole near the first hole.

[0007] The broach assembly further includes a bearing, which is disposed within the receiving groove and sleeved on the outside of the rotating shaft, and the rotating shaft is rotatably connected to the bearing.

[0008] The receiving groove has a first limiting block protruding from its wall, and the outer wall of the rotating shaft has a second limiting block protruding from its side. The second limiting block has a limiting groove on the side facing the first limiting block, and the end of the first limiting block extends into the limiting groove.

[0009] The puller assembly further includes: a first seal connected to the end of the rotating shaft away from the puller rod, and the first seal can rotate with the rotating shaft; a second seal disposed in the receiving groove and abutting against the first seal; wherein the first seal and the second seal are sealed between the water inlet pipe and the first water outlet pipe.

[0010] Both the first and second seals are made of ceramic material.

[0011] The end cap has a cavity, and the pushing assembly includes: a piston that can extend and retract relative to the cavity; a second elastic part that elastically abuts against the piston and the cavity wall; and a cutting tool pad that is located outside the cavity and connected to the piston. The cutting tool pad is configured to push the cutting tool shaft to move during the extension and retraction of the piston.

[0012] The first valve body is a one-way valve, and the second valve body is a one-way sequence valve.

[0013] Beneficial effects: This application establishes an effective cooling circulation system within the spindle by configuring an inlet pipe, a first outlet pipe, and a second outlet pipe. The first outlet pipe passes directly through the broach assembly, allowing the liquid (e.g., coolant) in the first outlet pipe to directly reach the tool's working area, thus cooling the tool. The second outlet pipe flows in the opposite direction through the outside of the housing, carrying away heat from the rear end of the spindle and reducing the risk of increased thermal expansion. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0015] Figure 1 This is a schematic diagram of the structure of a spindle provided in an embodiment of this application;

[0016] Figure 2 for Figure 1 Enlarged schematic diagram of Part II;

[0017] Figure 3 This is a schematic diagram of the structure of a swing head provided in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. 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.

[0021] Please refer to the following: Figure 1 and Figure 2 In one embodiment of this application, a spindle 100 is provided, including a housing 10, an end cap 20, a spindle 30, a broaching mechanism 40, and a cooling assembly 50. The end cap 20 is disposed at one end of the housing 10, and the spindle 30, the broaching mechanism 40, and the cooling assembly 50 are disposed between the housing 10 and the end cap 20.

[0022] Specifically, the housing 10 is a hollow cavity open at both ends. The housing 10 is the basic structure of the entire spindle 100, providing installation space for other components within the spindle 100. The end cap 20 covers one end of the housing 10, protecting the internal components from external contamination. The spindle 30 is rotatably disposed within the housing 10. The spindle 30 has an axial hole 31 and is typically driven by a motor (not shown) to rotate relative to the housing 10.

[0023] The broaching mechanism 40 includes a broaching assembly 41 and a pushing assembly 42. The broaching assembly 41 is disposed in the axial hole 31 for mounting a cutting tool (not shown). The pushing assembly 42 is connected between the housing 10 and the end cap 20, and is configured to push the broaching assembly 41 axially to a first position (not shown) to clamp the cutting tool, or to a second position (not shown) to release the cutting tool. That is, when installing or removing a cutting tool, the pushing assembly 42 is responsible for moving axially to control the broaching assembly 41 to achieve clamping or releasing the cutting tool, thereby improving the efficiency of cutting tool replacement.

[0024] The cooling assembly 50 includes an inlet pipe 51, a first outlet pipe 52, and a second outlet pipe 53. The inlet pipe 51 is used to connect to the water tank 54 and passes through the housing 10 and the end cap 20 in sequence to extend into the cutter assembly 41. One end of the first outlet pipe 52 is connected to the inlet pipe 51, and the other end passes through the cutter assembly 41. A first valve body 55 is provided between the first outlet pipe 52 and the inlet pipe 51. One end of the second outlet pipe 53 is connected to the inlet pipe 51, and the other end passes through the cutter assembly 41 and the end cap 20 in the opposite direction to the inlet pipe 51 in sequence to extend out of the housing 10 and connect to the water tank 54. A second valve body 56 is provided at the end of the second outlet pipe 53.

[0025] Liquid (e.g., coolant) is introduced from an external water tank 54 via the inlet pipe 51. The liquid passes sequentially through the housing 10 and the end cap 20, finally entering the broach assembly 41. The first outlet pipe 52 connects to the inlet pipe 51, allowing the liquid flowing in from the inlet pipe 51 to directly enter the working area of ​​the tool (e.g., the cutting zone), thus cooling the tool during operation. The second outlet pipe 53 flows in the opposite direction and is used to cool the rear end of the spindle 100 when tool cooling is not required.

[0026] In actual operation, when the tool is in normal working condition, the second valve body 56 should be closed and the first valve body 55 should be opened. Liquid enters the first outlet pipe 52 from the inlet pipe 51, allowing liquid to flow out of the tool. Conversely, if the tool does not need cooling temporarily, the second valve body 56 should be opened and the first valve body 55 closed. Liquid enters the second outlet pipe 53 from the inlet pipe 51, allowing the liquid to return to the water tank 54 and circulate again from the water tank 54 to the inlet pipe 51 and the second outlet pipe 53.

[0027] In the aforementioned spindle 100, an effective cooling circulation system is formed within the spindle 100 by providing an inlet pipe 51, a first outlet pipe 52, and a second outlet pipe 53. The first outlet pipe 52 passes directly through the broach assembly 41, allowing the liquid (e.g., coolant) in the first outlet pipe 52 to directly reach the tool working area, thereby cooling the tool. The second outlet pipe 53 flows in the opposite direction through the outside of the housing 10, carrying away heat from the rear end of the spindle 100 and reducing the risk of increased thermal expansion.

[0028] Please continue reading. Figure 1 and Figure 2 In one embodiment, the first valve body 55 is a one-way valve, and the second valve body 56 is a one-way sequence valve.

[0029] The one-way valve allows liquid to flow in only one direction, preventing it from flowing in the opposite direction. In this embodiment, the one-way valve is located between the inlet pipe 51 and the first outlet pipe 52, ensuring that liquid (such as coolant) can only flow from the inlet pipe 51 to the first outlet pipe 52, preventing liquid from flowing back into the inlet pipe 51, helping to maintain the pressure stability of the cooling system, and ensuring that the liquid can effectively reach the required parts.

[0030] The one-way sequence valve not only functions as a one-way valve but also controls the flow sequence or timing of fluids based on pressure changes in the system. In this embodiment, the second valve body 56 is located at the end of the second outlet pipe 53. It can control when and how the liquid returns from the second outlet pipe 53 to the water tank 54 according to preset pressure conditions, thereby ensuring that the liquid prioritizes the cooling needs of critical areas before being discharged from the system, or adjusting the liquid circulation path as needed to achieve the best cooling effect.

[0031] Please continue reading. Figure 1 and Figure 2In one embodiment, the broach assembly 41 includes a broach rod 411, a broach claw 412, a retaining sleeve 413, a rotating shaft 414, and a cutting shaft 415. The broach rod 411 is telescopically disposed within the axial hole 31 along the extension direction of the spindle 30. The broach claw 412 is connected to one end of the broach rod 411 and is used to clamp or release the cutting tool. That is, the broach rod 411 transmits a pushing force during the axial extension and retraction along the spindle 30, causing the broach claw 412 to clamp or release the cutting tool. The retaining sleeve 413 is disposed at the end of the broach rod 411 away from the broach claw 412, and the side of the retaining sleeve 413 facing the broach rod 411 has a receiving groove 4131. The rotating shaft 414 is rotatably disposed within the receiving groove 4131, and the rotating shaft 414 is fixedly connected to the broach rod 411. One end of the cutter shaft 415 is connected to the end of the fixed sleeve 413 away from the drawbar 411, and the other end is slidably connected to the end cap 20. The push assembly 42 is configured to push the cutter shaft 415. The fixed sleeve 413 is located at the end of the drawbar 411 and serves as a mounting base for the rotating shaft 414 and the cutter shaft 415, so that the rotating shaft 414 is fixed to the drawbar 411, ensuring that the drawbar 411 can rotate with the spindle 30, and the cutter shaft 415 can be driven by the push assembly 42 to achieve axial displacement.

[0032] Specifically, during the tool release process, the pushing assembly 42 pushes the tool-removing shaft 415 to move towards the pull claw 412. The tool-removing shaft 415 drives the fixed sleeve 413 and the pull rod 411 to move axially, causing the pull claw 412 to expand and release the tool for easy tool change. Conversely, during the tool clamping process, the pushing assembly 42 drives the tool-removing shaft 415 to move away from the pull claw 412, the pull rod 411 retracts, and the pull claw 412 contracts, thereby clamping the tool.

[0033] The water inlet pipe 51 passes through the housing 10, end cap 20, and cutter shaft 415 in sequence to extend into the fixed sleeve 413. One end of the first water outlet pipe 52 is connected to the water inlet pipe 51, and the other end passes through the rotating shaft 414, cutter rod 411, and cutter claw 412 in sequence. One end of the second water outlet pipe 53 is connected to the water inlet pipe 51, and the other end passes through the fixed sleeve 413, cutter shaft 415, and end cap 20 in the opposite direction to the water inlet pipe 51 to extend out of the housing 10.

[0034] Specifically, the water inlet pipe 51 passes through the housing 10, end cap 20, and cutter shaft 415, finally extending into the fixed sleeve 413, ensuring that the liquid (such as coolant) can directly reach the part that needs cooling the most. The first water outlet pipe 52 branches off from the water inlet pipe 51 and passes sequentially through the rotating shaft 414, cutter bar 411, and cutter claw 412, allowing the coolant to act directly on the contact point of the tool, thereby improving the cooling efficiency at the tool and reducing tool wear caused by high temperature. The second water outlet pipe 53 also branches off from the water inlet pipe 51, but in the opposite direction, passing sequentially through the fixed sleeve 413, cutter shaft 415, and end cap 20, finally returning to the water tank 54. This not only helps the liquid circulate but also effectively removes heat from the working area, reducing the possibility of thermal deformation.

[0035] Please continue reading. Figure 1 and Figure 2 In one embodiment, the axial hole 31 has a first hole portion 311 and a second hole portion 312 that communicate with each other. The diameter of the second hole portion 312 is larger than the diameter of the first hole portion 311, allowing different components within the spindle 100 to be placed in holes of suitable size as needed. One end of the puller rod 411 extends into the first hole portion 311 to connect to the puller claw 412, and the other end is located within the second hole portion 312. A retaining block 4111 protrudes from the outer wall of the end of the puller rod 411 near the fixing sleeve 413. The puller assembly 41 also includes a first elastic portion 416, which is disposed within the second hole portion 312 and elastically abuts against the retaining block 4111 and the hole wall of the second hole portion 312 near the first hole portion 311.

[0036] Specifically, the first hole 311 guides the linear movement of the drawbar 411, ensuring the alignment of the pull claw 412 with the cutting tool. The second hole 312 accommodates the first elastic part 416 and the abutment block 4111, providing a reset space. Simultaneously, the first elastic part 416 maintains the drawbar force and applies a constant reaction force to the drawbar 411, helping it maintain the correct position or providing necessary cushioning during operation.

[0037] In one embodiment, the first elastic part 416 is a return spring.

[0038] Please continue reading. Figure 1 and Figure 2 In one embodiment, the broach assembly 41 further includes a bearing 417 disposed within the receiving groove 4131 and sleeved on the outside of the rotating shaft 414, the rotating shaft 414 being rotatably connected to the bearing 417. The bearing 417 supports the rotating shaft 414, ensuring that the broach rod 411 rotates synchronously with the spindle 30, while also reducing the rotational friction between the rotating shaft 414 and the fixed sleeve 413.

[0039] Please continue reading. Figure 1and Figure 2 In one embodiment, the groove wall of the receiving groove 4131 is provided with a first limiting block 4132, and the outer side wall of the rotating shaft 414 is provided with a second limiting block 4141. The second limiting block 4141 is provided with a limiting groove 4142 on the side facing the first limiting block 4132. The end of the first limiting block 4132 extends into the limiting groove 4142 to form a mechanical seal structure, which reduces the risk of liquid or other impurities entering the bearing 417, effectively restricts the position of the rotating shaft 414 in the receiving groove 4131, and reduces the risk of the rotating shaft 414 leaving the predetermined position range during the rotation of the fixed sleeve 413.

[0040] Please continue reading. Figure 1 and Figure 2 In one embodiment, the puller assembly 41 further includes a first seal 418 and a second seal 419. The first seal 418 is connected to the end of the rotating shaft 414 away from the puller rod 411, and the first seal 418 can rotate with the rotating shaft 414. The second seal 419 is disposed in the receiving groove 4131 and abuts against the first seal 418. The first seal 418 and the second seal 419 are sealed between the water inlet pipe 51 and the first water outlet pipe 52. The main function of the first seal 418 is dynamic sealing, that is, maintaining a sealing effect while the rotating shaft 414 rotates, reducing the risk of liquid leakage from the water inlet pipe 51 and the first water outlet pipe 52 through gaps between the rotating shaft 414 and other components. The second seal 419 provides a static sealing point, working in conjunction with the first seal 418 to enhance the overall sealing performance.

[0041] Please continue reading. Figure 1 and Figure 2 In one embodiment, both the first seal 418 and the second seal 419 are made of ceramic material. Ceramic material has extremely high hardness and wear resistance, which makes the first seal 418 and the second seal 419 less prone to wear even under long-term use or high-speed rotation, ensuring long-term efficient operation.

[0042] In other embodiments, the first seal 418 and the second seal 419 may also be made of other wear-resistant materials, which are not limited here.

[0043] Please continue reading. Figure 1 and Figure 2In one embodiment, the end cap 20 has a cavity 21. The pushing assembly 42 includes a piston 421, a second elastic part 422, and a blade washer 423. The piston 421 can extend and retract relative to the cavity 21. The movement of the piston 421 is the core of the operation of the entire pushing assembly 42. It moves within the cavity 21 under the action of external force (such as hydraulic or pneumatic pressure) to generate thrust or pull. The second elastic part 422 elastically abuts against the cavity wall between the piston 421 and the cavity 21, providing buffering for the piston 421 during its movement within the cavity 21, ensuring that the piston 421 moves smoothly and controllably. The cutter shim 423 is located outside the cavity 21 and connected to the piston 421. The cutter shim 423 is configured to push the cutter shaft 415 to move during the extension and retraction of the piston 421. When the piston 421 extends and retracts within the cavity 21, the cutter shim 423 moves accordingly and pushes the cutter shaft 415 back and forth by directly contacting it, thereby realizing the clamping or releasing operation of the cutter.

[0044] The aforementioned push assembly 42 obtains push-pull force through the movement of piston 421, thereby indirectly achieving precise control of the tool. This not only improves the control accuracy and stability during tool clamping and releasing, but also enhances the reliability and adaptability of the entire spindle 100.

[0045] In one embodiment, the first elastic part 416 is a return spring.

[0046] Please refer to the following: Figure 1 , Figure 2 and Figure 3 This application also provides a swivel head 200, including the aforementioned main shaft 100.

[0047] In this embodiment, the oscillating head 200 further includes a C-axis 60 and an A-axis 70, wherein the C-axis 60 and the A-axis 70 are rotatably connected, and a C-axis motor (not shown) is disposed between them. The A-axis 70 is rotatably connected to the main shaft 100, and an A-axis motor (not shown) is disposed between them.

[0048] Specifically, the C-axis motor drives the A-axis 70 to rotate at a precise angle relative to the C-axis 60, and the A-axis motor drives the spindle 100 to rotate at a precise angle relative to the A-axis 70, thereby enabling the oscillating head 200 to adjust and position the milling direction of the tool at the end of the spindle 100.

[0049] Meanwhile, since a cooling assembly 50 is provided in the spindle 100, the cooling assembly 50 forms an effective cooling circulation system within the spindle 100 through an inlet pipe 51, a first outlet pipe 52, and a second outlet pipe 53. The first outlet pipe 52 passes directly through the broach assembly 41, allowing the liquid (e.g., coolant) in the first outlet pipe 52 to directly reach the tool working area, thereby cooling the tool. The second outlet pipe 53 flows in the opposite direction through the outside of the housing 10, which can carry away the heat from the rear end of the spindle 100 and reduce the risk of increased thermal expansion.

[0050] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A spindle, characterized in that, include: The shell is a hollow cavity open at both ends; End cap, which covers one end of the housing; A mandrel is rotatably disposed within the housing, and the mandrel is provided with an axial hole; A broaching mechanism includes a broaching assembly and a pushing assembly. The broaching assembly is disposed in the axial hole for mounting a cutting tool. The pushing assembly is connected between the housing and the end cap, and the pushing assembly is configured to push the broaching assembly to move axially along the mandrel to a first position to clamp the cutting tool, or to move to a second position to release the cutting tool. A cooling assembly includes an inlet pipe, a first outlet pipe, and a second outlet pipe. The inlet pipe is used to connect to a water tank and passes through the housing and the end cap in sequence to extend into the cutter assembly. One end of the first outlet pipe is connected to the inlet pipe, and the other end passes through the cutter assembly. A first valve body is provided between the first outlet pipe and the inlet pipe. One end of the second outlet pipe is connected to the inlet pipe, and the other end passes through the cutter assembly and the end cap in the opposite direction to the inlet pipe in sequence to extend out of the housing and connect to the water tank. A second valve body is provided at the end of the second outlet pipe. The broach assembly includes: A drawbar is retractably disposed within the axial hole along the extension direction of the mandrel; A pull claw is connected to one end of the pull bar and is used to clamp or release the cutter. A fixing sleeve is provided at the end of the pull bar away from the pull claw, and the fixing sleeve has a receiving groove on the side facing the pull bar; A rotating shaft is rotatably disposed within the receiving groove, and the rotating shaft is fixedly connected to the drawbar. A cutting shaft has one end connected to a fixed sleeve away from the pull rod, and the other end slidably connected to the end cap. The pushing assembly is configured to push the cutting shaft. The water inlet pipe passes through the housing, the end cap, and the cutting shaft in sequence to extend into the fixed sleeve. One end of the first water outlet pipe is connected to the water inlet pipe, and the other end passes through the rotating shaft, the cutting rod, and the claw in sequence. One end of the second water outlet pipe is connected to the water inlet pipe, and the other end passes through the fixed sleeve, the cutting shaft, and the end cap in the opposite direction to the water inlet pipe to extend out of the housing.

2. The spindle according to claim 1, characterized in that, The axial hole has a first hole portion and a second hole portion that communicate with each other. The diameter of the second hole portion is larger than the diameter of the first hole portion. One end of the puller rod extends into the first hole portion to connect with the pull claw, and the other end is located in the second hole portion. A retaining block protrudes from the outer wall of the end of the puller rod near the fixed sleeve. The puller assembly also includes: A first elastic portion is disposed within the second hole, and the first elastic portion elastically abuts against the abutting block and the hole wall of the second hole near the first hole.

3. The spindle according to claim 1, characterized in that, The broach assembly also includes: A bearing is disposed within the receiving groove and sleeved on the outside of the rotating shaft, the rotating shaft being rotatably connected to the bearing.

4. The spindle according to claim 1, characterized in that, The receiving groove has a first limiting block protruding from its wall, and the outer side wall of the rotating shaft has a second limiting block protruding from its wall. The second limiting block has a limiting groove on the side facing the first limiting block, and the end of the first limiting block extends into the limiting groove.

5. The spindle according to claim 1, characterized in that, The broach assembly also includes: A first seal is connected to the end of the rotating shaft away from the drawbar, and the first seal can rotate with the rotating shaft; The second sealing element is disposed within the receiving groove and abuts against the first sealing element; The first sealing element and the second sealing element are disposed between the water inlet pipe and the first water outlet pipe.

6. The spindle according to claim 5, characterized in that, Both the first seal and the second seal are made of ceramic material.

7. The spindle according to claim 1, characterized in that, The end cap has a cavity, and the pushing component includes: The piston can extend and retract relative to the cavity; The second elastic part elastically abuts against the piston and the cavity wall; A cutter shim is disposed outside the cavity and connected to the piston, the cutter shim being configured to push the cutter shaft to move during the extension and retraction of the piston.

8. The spindle according to claim 1, characterized in that, The first valve body is a one-way valve, and the second valve body is a one-way sequence valve.

9. A head-swinging mechanism, characterized in that, Includes the spindle described in any one of claims 1 to 8.

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