Main shaft and machining center

Abstract

The utility model provides a main shaft which comprises a fixed sleeve, a rotating shaft body and a brake assembly, the rotating shaft body is rotatably arranged on the fixed sleeve, and the rotating shaft body comprises a brake matching part; the fixed sleeve comprises a sleeve body and a fixed end cover arranged on one end side of the sleeve body; the brake assembly comprises a fixing ring, a brake part and a piston connected with the brake part, a hydraulic cavity allowing the piston to move in the axial direction is formed between the fixing sleeve and the fixing ring, and the piston drives the brake part to be matched with the brake matching part in a braking mode; or, a hydraulic cavity for the piston to move in the radial direction is formed between the fixing sleeve and the fixing ring, so that the piston drives the brake part to be in brake fit with the brake matching part. The utility model further provides a machining center. According to the main shaft provided by the technical scheme of the utility model, efficient braking of the main shaft can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of processing equipment, in particular to a spindle and a processing center. Background Art

[0002] The lathe spindles currently on the market need to meet not only turning processing (spindle braking, workpiece rotating) but also milling processing (spindle rotating, workpiece not moving), which requires the spindle to be able to brake in a timely and stable manner so as to be able to switch between turning and milling processing. However, the existing spindles cannot achieve spindle braking in a timely and stable manner. For example, in the patent application publication number CN 109530731 A, in combination with the attached Figure 1 It discloses that the spindle assembly 1 includes a spindle housing 11, an axis 12 installed in the spindle housing 11 through a rolling bearing, and a clamping ring 13 sleeved on the front end of the axis 12 and locked on the spindle housing 11; the clamping ring 13 presses the rolling bearing at the front end of the spindle housing 11; the outer diameter of the clamping ring 13 is less than or equal to the outer diameter of the spindle housing 11; a detachable locking ring 3 is provided on the outside of the front end of the spindle housing 11; the outer side of the motor 2 has a shell 21; the brake assembly 4 includes a sleeve 41, a brake disc 42, a back nut and a damping brake block 43.

[0003] In the above patent, the braking of the axis 12 and the spindle housing 11 is achieved through the brake disc 42, the back nut and the damping brake block 43. However, the braking through the brake disc 42, the back nut and the damping brake block 43 structure takes a long time and has low braking efficiency.

[0004] Therefore, how to achieve efficient braking of the spindle is an urgent problem to be solved. Utility Model Content

[0005] The utility model provides a main shaft and a machining center, which can realize efficient braking of the main shaft.

[0006] The utility model provides a main shaft, comprising a fixed sleeve, a rotating shaft body and a brake assembly, wherein the rotating shaft body can be rotatably arranged on the fixed sleeve, and the rotating shaft body comprises a brake matching portion;

[0007] The fixed sleeve comprises a barrel and a fixed end cover arranged at one end of the barrel;

[0008] The brake assembly includes a fixed ring, a brake part and a piston connected to the brake part. A hydraulic chamber for the piston to move in the axial direction is formed between the fixed sleeve and the fixed ring, so that the brake part and the brake matching part are driven by the piston to engage in braking; or, a hydraulic chamber for the piston to move in the radial direction is formed between the fixed sleeve and the fixed ring, so that the brake part and the brake matching part are driven by the piston to engage in braking.

[0009] In some feasible embodiments, the piston moves axially along the rotating shaft, the piston can move up and down axially in the hydraulic chamber, the brake part is arranged below the piston, and when the brake assembly is in a braking engagement state, the piston moves upward to enable the brake part to engage with the brake engagement part.

[0010] In some feasible embodiments, a first mounting seat is provided between the fixed end cover and the fixed ring, and a reset cavity is provided on the first mounting seat;

[0011] The brake assembly also includes a reset member, which is axially slidably disposed in the reset chamber and remains fixed relative to the piston and the brake part. When the brake assembly is in a brake release state, the reset member is used to drive the brake part to move away from the brake engagement part to release the brake between the rotating shaft and the fixed sleeve.

[0012] In some feasible embodiments, a second mounting seat is provided between the cylinder body and the fixing ring, the hydraulic chamber is arranged on the second mounting seat, and the second mounting seat is provided with a first flow channel connected to the bottom of the hydraulic chamber, and the first flow channel is used to allow liquid to flow into the hydraulic chamber; the first mounting seat is also provided with a second flow channel connected to the top of the reset chamber, and the second flow channel is used to allow liquid to flow into the reset chamber.

[0013] In some feasible embodiments, the first mounting seat and the second mounting seat are both annular, the first mounting seat includes an inner ring portion and an outer ring portion, and the inner ring portion, the outer ring portion, the fixing ring and the piston form a reset chamber; the second mounting seat includes an inner ring portion and an outer ring portion, and the inner ring portion, the outer ring portion, the fixing ring and the reset member form a hydraulic chamber.

[0014] In some feasible embodiments, the brake assembly further includes a guide member, and a sliding portion for the guide member to slide is provided in the fixing ring;

[0015] The reset member and the piston are respectively located on two sides of the fixing ring along the axial direction, the top of the guide member is connected to the piston, and the bottom of the guide member is connected to the reset member.

[0016] In some feasible embodiments, the brake part includes an inner ring part and an outer ring part, the inner ring part of the brake part and the brake matching part are axially spaced apart, the inner ring part of the brake part is used for braking cooperation with the brake matching part, and the outer ring part of the brake part is fixedly connected to the reset part.

[0017] In some feasible embodiments, the guide member is rod-shaped, the piston is ring-shaped, and the guide member includes a plurality of guide members, which are evenly arranged on the fixing ring.

[0018] In some feasible embodiments, a locking portion cooperating with the piston brake is provided on one side of the guide seat close to the piston, and the brake cooperating portion and the locking portion cooperate with the brake portion for braking at the same time, or the brake cooperating portion and the locking portion release the brake cooperation with the brake portion at the same time.

[0019] In some feasible embodiments, the spindle has a turning mode and a milling mode. When the spindle is in the turning mode, the rotating shaft body is braked with the fixed sleeve through a brake assembly; when the spindle is in the milling mode, the rotating shaft body and the fixed sleeve are released from the braking mode.

[0020] The utility model also provides a machining center, comprising a base and the main shaft arranged on the base.

[0021] The above-mentioned spindle and machining center are provided with a fixed sleeve, a rotating shaft and a brake assembly, wherein the rotating shaft can be rotatably arranged on the fixed sleeve, and the rotating shaft includes a brake matching part; the fixed sleeve includes a cylinder body and a fixed end cover arranged on one end of the cylinder body; the brake assembly includes a fixed ring, a brake part and a piston connected to the brake part, and a hydraulic chamber for the piston to move in the axial direction is formed between the fixed sleeve and the fixed ring, so that the brake part and the brake matching part are driven by the piston to brake and cooperate; or, a hydraulic chamber for the piston to move in the radial direction is formed between the fixed sleeve and the fixed ring, so that the brake part and the brake matching part are driven by the piston to brake and cooperate, thereby realizing efficient braking of the spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work.

[0023] Figure 1 The present invention provides a cross-sectional view of an end-face positioning and locking dual-purpose turning and milling cutting spindle and a method of using the same, provided in the prior art.

[0024] Figure 2 A three-dimensional diagram of a main shaft provided in one embodiment of the utility model.

[0025] Figure 3 A three-dimensional cross-sectional view of a main shaft provided in one embodiment of the utility model.

[0026] Figure 4 for Figure 3 A is an enlarged schematic diagram.

[0027] Component Symbols

[0028] 100, fixed sleeve; 110, barrel; 304, reset chamber; 305, second flow channel; 306, first sealing ring; 120, fixed end cover; 301, hydraulic chamber; 302, first flow channel; 303, second sealing ring; 200, rotating shaft; 210, brake fitting part; 300, brake assembly; 310, fixed ring; 311, sliding part; 320, brake part; 330, piston; 340, guide member; 350, reset member; 360, first mounting seat; 370, second mounting seat; 400, pulley; 500, mounting flange; 600, cylindrical bearing; 700, bidirectional load-bearing bearing.

[0029] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In order to make the content of the utility model more clearly and more accurately understood, it will now be described in detail with reference to the accompanying drawings. The accompanying drawings of the specification illustrate examples of embodiments of the utility model, wherein the same reference numerals represent the same elements. It is understood that the scales shown in the accompanying drawings of the specification are not the scales of the actual implementation of the utility model, which are only for the purpose of illustration and are not drawn according to the original size.

[0034] Please see Figure 2 and 3 The utility model provides a main shaft, including a fixed sleeve 100, a rotating shaft body 200 and a brake assembly 300.

[0035] Please see Figure 2 and 3 The fixed sleeve 100 is used to provide an installation space for the rotating shaft 200 and the brake assembly 300. In the present embodiment, the fixed sleeve 100 is cylindrical and has a through hole extending axially through the fixed sleeve 100. The rotating shaft 200 can be inserted into the through hole and can rotate relative to the fixed sleeve 100.

[0036] Please see Figure 3 , the rotating shaft 200 is used to drive the tool to rotate. In this embodiment, the rotating shaft 200 is rotatably disposed on the fixed sleeve 100, and the brake assembly 300 is used to brake the rotating shaft 200. In this embodiment, the rotating shaft 200 includes a brake matching portion 210, and the brake assembly 300 brakes the rotating shaft 200 by acting on the brake matching portion 210. The structure of the brake matching portion 210 is described below.

[0037] Please see Figure 3 and 4 The fixed sleeve 100 includes a barrel 110 and a fixed end cover 120 arranged at one end of the barrel 110; it can be understood that the end of the rotating shaft 200 away from the fixed end cover 120 is a tool mounting portion for installing a processing tool, and the fixed sleeve 100 also includes a guide seat 130 arranged between the barrel 110 and the fixed end cover 120.

[0038] Please see Figure 3 and 4The brake assembly 300 includes a fixed ring 310, a brake part 320 and a piston 330 connected to the brake part 320. A hydraulic chamber 301 for the piston 330 to move in the axial direction is formed between the fixed sleeve 100 and the fixed ring 310, so that the brake part 320 and the brake matching part 210 are driven by the piston 330 to brake and cooperate. For example, a hydraulic chamber 301 for the piston 330 to move in the radial direction is formed between the cylinder body 110 and the fixed ring 310; or, a hydraulic chamber 301 for the piston 330 to move in the radial direction is formed between the fixed sleeve 100 and the fixed ring 310, so that the brake part 320 and the brake matching part 210 are driven by the piston 330 to brake and cooperate. For example, a hydraulic chamber 301 for the piston 330 to move in the radial direction is formed between the cylinder body 110 and the fixed ring 310. In this embodiment, the piston 330 moves along the axial direction of the rotating shaft 200, and the piston 330 can move up and down along the axial direction in the hydraulic cavity 301. The brake part 320 is arranged below the piston 330. When the brake assembly 300 is in a braking engagement state, the piston 330 moves upward to make the brake part 320 engage in braking engagement with the brake engagement part 210. In some other embodiments, a hydraulic cavity 301 is formed between the fixed end cover 120 and the fixed ring 310 for the piston 330 to move in the radial direction. At this time, the brake part 320 is cylindrical in shape, and the hydraulic cavity 301 is also cylindrical in shape, because if the brake part 320 moves in the radial direction, if it is annular, then when it moves radially inward, the inner diameter will be smaller than the outer diameter, and the brake part 320 is cylindrical in shape, or arc-shaped.

[0039] Please see Figure 4 The brake part 320 includes an inner ring part and an outer ring part. The inner ring part of the brake part 320 is axially spaced from the brake matching part 210. The inner ring part of the brake part 320 is used for braking cooperation with the brake matching part 210. The brake part 320 is annular and has a step on the outer periphery of the brake part 320. By setting the step, the top surface of the periphery of the brake part 320 is fixedly connected to the reset part 350.

[0040] Please see Figure 4In order to facilitate the release of the braking of the rotating shaft body 200 relative to the fixed sleeve 100 after the braking of the rotating shaft body 200 relative to the fixed sleeve 100 is achieved, a first mounting seat 360 is axially provided between the fixed end cover 120 and the fixed ring 310, and a reset chamber 304 is provided on the first mounting seat 360; the brake assembly 300 also includes a reset member 350, which is axially slidably arranged in the reset chamber 304, and the reset member 350 is kept fixed relative to the piston 330 and the brake part 320. When the brake assembly 300 is in a brake release state, the reset member 350 is used to drive the brake part 320 to move in a direction away from the brake matching part 210 to release the braking between the rotating shaft body 200 and the fixed sleeve 100. Specifically, the outer ring portion of the brake part 320 is fixedly connected to the reset member 350, that is, the top surface of the outer ring portion of the brake part 320 is fixedly connected to the bottom of the reset member 350. When it is necessary to release the brake of the rotating shaft 200 relative to the fixed sleeve 100, liquid is transported into the reset chamber 304 to apply pressure axially toward the top surface of the reset member 350, so that the reset member 350 drives the brake portion 320 to move away from the brake matching portion 210, thereby releasing the brake of the rotating shaft 200 relative to the fixed sleeve 100.

[0041] Please see Figure 4 In order to facilitate the driving of the piston 330 to move axially upward in the hydraulic chamber 301, a second mounting seat 370 is axially provided between the barrel 110 and the fixing ring 310, and the hydraulic chamber 301 is arranged on the second mounting seat 370. The second mounting seat 370 is provided with a first flow channel 302 connected to the bottom of the hydraulic chamber 301, and the first flow channel 302 is used for liquid to flow into the hydraulic chamber 301, so as to facilitate the application of pressure to the lower surface of the piston 330, thereby driving the brake part 320 to move toward the direction close to the brake matching part 210; the first mounting seat 360 is also provided with a second flow channel 305 connected to the top of the reset chamber 304, and the second flow channel 305 is used for liquid to flow into the reset chamber 304, so as to facilitate the application of pressure to the upper surface of the reset member 350, thereby driving the brake part 320 to move in the direction away from the brake matching part 210.

[0042] Please see Figure 4, the first mounting seat 360 and the second mounting seat 370 are both annular, and the first mounting seat 360 includes a first inner ring portion and a first outer ring portion. In this embodiment, the first inner ring portion and the first outer ring portion can be separated, so as to facilitate the installation and removal of the first mounting seat 360, the fixing ring 310 and the fixing end cover 120. The first inner ring portion, the first outer ring portion, the fixing ring 310 and the piston 330 form a reset chamber 304; the first mounting seat 360 is axially arranged between the fixing ring 310 and the fixing end cover 120. The second mounting seat 370 includes a second inner ring portion and a second outer ring portion. The second inner ring portion, the second outer ring portion, the fixing ring 310 and the reset member 350 form a hydraulic chamber 301. In this embodiment, the second inner ring portion and the second outer ring portion can be separated, so as to facilitate the installation and removal of the second mounting seat 370, the fixing ring 310 and the barrel 110. In some other embodiments, the tops of the second inner ring portion and the second outer ring portion are sealed and connected by an annular plate, so that the hydraulic chamber 301 is formed only by the second mounting seat 370 and the fixing ring 310, thereby improving the hydraulic oil bearing capacity of the hydraulic chamber 301. The second mounting seat 370 is axially arranged between the fixing ring 310 and the barrel 110, so as to facilitate the installation and removal of the first mounting seat 360, the second mounting seat 370 and the fixing ring 310 with the barrel 110 and the fixed end cover 120.

[0043] Please see Figure 4 The brake assembly 300 further includes a guide member 340, and a sliding portion 311 for the guide member 340 to slide is provided in the fixing ring 310; in this embodiment, the guide member 340 is in the shape of a rod, and the sliding portion 311 can be a columnar sliding hole provided in the fixing ring 310 along the axial direction, so as to limit the axial movement of the piston 330 and the reset member 350, and also facilitate the piston 330 to push the brake part 320 to move toward the direction close to the brake matching part 210 through the guide member 340 and the reset member 350. The reset member 350 and the piston 330 are respectively located on both sides of the fixing ring 310 along the axial direction, the top of the guide member 340 is connected to the piston 330, and the bottom of the guide member 340 is connected to the reset member 350. It can be understood that the guide member 340 is detachably connected to the piston 330 and the reset member 350. For example, the top of the guide member 340 is detachably connected to the piston 330 by bolts, and the bottom of the guide member 340 is detachably connected to the reset member 350 by bolts, thereby facilitating the assembly and disassembly of the brake assembly 300.

[0044] Please see Figure 4The guide member 340 is rod-shaped, the piston 330 is annular, and the guide member 340 includes a plurality of guide members 340, which are evenly arranged on the fixing ring 310. By arranging the piston 330 in an annular shape, the contact area of ​​the liquid (hydraulic oil in this embodiment) acting on the lower surface of the piston 330 can be increased, thereby increasing the moving speed of the piston 330, and also increasing the moving speed of the guide member 340, the reset member 350 and the brake part 320, thereby reducing the brake response time of the brake assembly 300.

[0045] The spindle has a turning mode and a milling mode. When the spindle is in the turning mode, the rotating shaft body 200 is braked and matched with the fixed sleeve 100 through the brake assembly 300; when the spindle is in the milling mode, the rotating shaft body 200 and the fixed sleeve 100 are released from the brake, so that the spindle can be used for turning. During turning, there are higher requirements for the locking effect of the spindle. The brake assembly 300 allows the spindle to adapt to the locking requirements of turning.

[0046] In order to ensure the sealing of the reset member 350 in the reset chamber 304 and the sealing of the piston 330 in the hydraulic chamber 301, the main shaft also includes a first sealing ring 306 and a second sealing ring 303. The first sealing ring 306 is sleeved on the outer periphery of the reset member 350 and connected to the inner circumferential wall of the reset chamber 304. The second sealing ring 303 is sleeved on the outer periphery of the piston 330 and connected to the inner circumferential wall of the hydraulic chamber 301.

[0047] Please see Figure 2 and 3 In this embodiment, a pulley 400 is provided at one end of the rotating shaft body 200 close to the fixed end cover 120, and the pulley 400 rotates synchronously with the rotating shaft body 200 along the axial direction, and the brake assembly 300 is located on the side of the pulley 400 away from the rotating shaft body 200. By providing the pulley 400, it can be connected to an external power motor through a belt transmission, thereby providing a power source for the rotating shaft body 200. For example, a mounting flange 500 is provided on the side of the pulley 400 away from the rotating shaft body 200, and the rotating disk is fixedly connected to the pulley 400 through the mounting flange 500. In some other embodiments, the power end of the rotating shaft body 200 can be a direct drive motor, so as to save space, improve space utilization, and improve the integration of the main shaft.

[0048] Please see Figure 3 The brake assembly 300 is close to the pulley 400 and is located at one end side of the rotating shaft 200 close to the fixed end cover 120, so that the brake assembly 300 can be close to the pulley 400 as a power source, thereby improving the braking effect.

[0049] Please see Figure 3In order to enable the rotating shaft body 200 to rotate stably relative to the fixed sleeve 100, the main shaft further includes a cylindrical bearing 600 and a bidirectional load bearing bearing 700, the bidirectional load bearing bearing 700 can simultaneously bear the radial and axial loads of the rotating shaft body 200, the cylindrical bearing 600 and the bidirectional load bearing bearing 700 are arranged between the rotating shaft body 200 and the fixed sleeve 100, and the cylindrical bearing 600 and the bidirectional load bearing bearing 700 are arranged in parallel along the axial direction of the rotating shaft body 200. For example, the bidirectional load bearing bearing 700 can be a bidirectional thrust angular contact ball bearing, so as to improve the load bearing of the rotating shaft body 200 relative to the fixed sleeve 100 in the axial and radial directions, and improve the stability of the main shaft.

[0050] The spindle and machining center are provided with a fixed sleeve 100, a rotating shaft 200 and a brake assembly 300. The rotating shaft 200 can be rotatably arranged on the fixed sleeve 100, and the rotating shaft 200 includes a brake fitting portion 210; the fixed sleeve 100 includes a barrel 110 and a fixed end cover 120 arranged at one end of the barrel 110; the brake assembly 300 includes a fixed ring 310, a brake portion 320 and a piston 330 connected to the brake portion 320, and the fixed sleeve 100 includes a fixed end cover 120 arranged at one end of the barrel 110; the brake assembly 300 includes a fixed ring 310, a brake portion 320 and a piston 330 connected to the brake portion 320. A hydraulic chamber 301 is formed between the cylinder 100 and the fixed ring 310 for the piston 330 to move in the axial direction, so that the piston 330 drives the brake part 320 to engage with the brake matching part 210 for braking; or, a hydraulic chamber 301 is formed between the fixed sleeve 100 and the fixed ring 310 for the piston 330 to move in the radial direction, so that the piston 330 drives the brake pad to engage with the brake matching part 210 for braking, thereby realizing efficient braking of the main shaft.

[0051] The utility model also provides a machining center, comprising a base and the main shaft arranged on the base.

[0052] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0053] The above examples are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A spindle, characterized in that: It comprises a fixed sleeve (100), a rotating shaft (200) and a brake assembly (300), wherein the rotating shaft (200) is rotatably disposed on the fixed sleeve (100), and the rotating shaft (200) comprises a brake matching portion (210); The fixed sleeve (100) comprises a barrel (110) and a fixed end cover (120) arranged on one end side of the barrel (110); The brake assembly (300) includes a fixing ring (310), a brake part (320) and a piston (330) connected to the brake part (320); a hydraulic chamber (301) for the piston (330) to move in the axial direction is formed between the fixing sleeve (100) and the fixing ring (310), so that the piston (330) can drive the brake part (320) to engage with the brake matching part (210) in a braking manner; or, a hydraulic chamber (301) for the piston (330) to move in the radial direction is formed between the fixing sleeve (100) and the fixing ring (310), so that the piston (330) can drive the brake part (320) to engage with the brake matching part (210) in a braking manner.

2. The spindle according to claim 1, characterized in that The piston (330) moves axially along the rotating shaft (200), and the piston (330) can move up and down axially in the hydraulic chamber (301). The brake part (320) is arranged below the piston (330). When the brake assembly (300) is in a braking engagement state, the piston (330) moves upward to enable the brake part (320) to engage in braking engagement with the brake engagement part (210).

3. The spindle according to claim 2, characterized in that A first mounting seat (360) is provided between the fixed end cover (120) and the fixed ring (310), and a reset cavity (304) is provided on the first mounting seat (360); The brake assembly (300) further includes a reset member (350), which is axially slidably disposed in the reset chamber (304). The reset member (350) remains fixed relative to the piston (330) and the brake part (320). When the brake assembly (300) is in a brake release state, the reset member (350) is used to drive the brake part (320) to move in a direction away from the brake engagement part (210) to release the brake between the rotating shaft (200) and the fixed sleeve (100).

4. The spindle according to claim 3, characterized in that A second mounting seat (370) is provided between the barrel (110) and the fixing ring (310); the hydraulic chamber (301) is arranged on the second mounting seat (370); a first flow channel (302) communicating with the bottom of the hydraulic chamber (301) is provided on the second mounting seat (370); the first flow channel (302) is used for allowing liquid to flow into the hydraulic chamber (301); and a second flow channel (305) communicating with the top of the reset chamber (304) is also provided on the first mounting seat (360); the second flow channel (305) is used for allowing liquid to flow into the reset chamber (304).

5. The spindle according to claim 4, characterized in that The first mounting seat (360) and the second mounting seat (370) are both annular. The first mounting seat (360) includes a first inner ring portion and a first outer ring portion. The first inner ring portion, the first outer ring portion, the fixing ring (310) and the piston (330) form a reset chamber (304). The second mounting seat (370) includes a second inner ring portion and a second outer ring portion. The second inner ring portion, the second outer ring portion, the fixing ring (310) and the reset member (350) form a hydraulic chamber (301).

6. The spindle according to any one of claims 3 to 5, characterized in that: The brake assembly (300) further comprises a guide member (340), and a sliding portion (311) for the guide member (340) to slide is provided in the fixing ring (310); The reset member (350) and the piston (330) are respectively located on both sides of the fixing ring (310) along the axial direction, the top of the guide member (340) is connected to the piston (330), and the bottom of the guide member (340) is connected to the reset member (350).

7. The spindle according to claim 6, characterized in that The brake part (320) includes an inner ring part and an outer ring part. The inner ring part of the brake part (320) and the brake matching part (210) are arranged at intervals along the axial direction. The inner ring part of the brake part (320) is used for braking cooperation with the brake matching part (210). The outer ring part of the brake part (320) is fixedly connected to the reset part (350).

8. The spindle according to claim 6, characterized in that The guide member (340) is rod-shaped, the piston (330) is annular, and the guide member (340) includes a plurality of guide members (340) which are evenly arranged on the fixing ring (310).

9. The spindle according to any one of claims 1 to 5, characterized in that: The spindle has a turning mode and a milling mode. When the spindle is in the turning mode, the rotating shaft body (200) is braked with the fixed sleeve (100) through a brake assembly (300); when the spindle is in the milling mode, the rotating shaft body (200) is braked with the fixed sleeve (100).

10. A machining center, characterized in that: The utility model comprises a base and a main shaft as claimed in any one of claims 1 to 9 arranged on the base.

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