Hydrostatic pressure spindle device and machine tool

Abstract

The invention discloses a hydrostatic pressure spindle device and a machine tool, the hydrostatic pressure spindle device comprises a spindle body, a tool changing mechanism and a reverse buckling mechanism, a spindle core of the spindle body is mounted in a first mounting hole of a mounting shell and can rotate around the axis of the spindle core; a first static pressure cavity is defined between the bottom side of the flange on the shaft core and the inner wall surface of the first mounting hole; a grabbing assembly of the tool changing mechanism comprises a pull rod component and a pull claw component, a driving assembly of the tool changing mechanism is installed at one end of the installation shell, the pull rod component is installed in a second installation hole of the shaft core and connected with the driving assembly, and the pull claw component is connected with the pull rod component. The pull rod component is driven by the driving assembly to drive the pull claw component to be switched between the grabbing state and the loosening state. The reverse buckling mechanism is used for applying acting force deviating from the first static pressure cavity to the shaft core. The hydrostatic pressure spindle solves the problem that the machining efficiency of a machine tool adopting the hydrostatic pressure spindle is low due to the fact that the replacement time of a cutter is long.

Description

Technical Field

[0001] The present application relates to the technical field of machining devices, and in particular to a liquid hydrostatic spindle device and a machine tool. Background Art

[0002] As the core component of ultra-precision machine tools, the precision and rigidity of the hydrostatic spindle greatly affect the machining accuracy of parts. The hydrostatic spindle uses a hydrostatic bearing as a support. The hydrostatic bearing relies on an external hydraulic oil supply system to forcibly inject lubricating oil to produce a pressure oil film, which is used to separate the moving parts and supports in relative motion, thus achieving full liquid friction. It can be seen that the hydrostatic spindle has the advantages of low friction resistance, high transmission efficiency, long service life, wide speed range, good vibration resistance, high spindle rotation accuracy, and good adaptability, and is widely used in the field of ultra-precision machine tool processing.

[0003] The hydrostatic spindle is provided with machining tools for machining workpieces, but the tool replacement operation is cumbersome and inconvenient, resulting in a long tool replacement time, which makes the machining efficiency of the machine tool using the hydrostatic spindle low. Summary of the invention

[0004] The main purpose of the present application is to provide a liquid hydrostatic spindle device and a machine tool to solve the problem in the background technology that the tool replacement time is long, resulting in low machining efficiency of the machine tool using the liquid hydrostatic spindle.

[0005] According to one aspect of the present application, there is provided a liquid hydrostatic spindle device, comprising:

[0006] A main shaft body, the main shaft body comprising a mounting shell and a shaft core, a first mounting hole is arranged in the mounting shell, the shaft core is mounted in the first mounting hole and can rotate around its own axis, a flange is arranged on the outer peripheral surface of the shaft core along one side of its own axial direction, a first static pressure cavity is formed between the bottom side of the flange and the inner wall surface of the first mounting hole along the axial direction of the shaft core, and a second mounting hole is arranged in the shaft core along the axial direction of the shaft core;

[0007] A tool changing mechanism, the tool changing mechanism comprises a driving assembly and a grabbing assembly, the grabbing assembly comprises a pull rod component and a pull claw component, the driving assembly is mounted on one end of the mounting shell along the axial direction of the shaft core, the pull rod component is mounted in the second mounting hole and connected to the driving assembly, the pull claw component is mounted on one end of the shaft core away from the driving assembly and connected to the pull rod component, the pull claw component has a grabbing state for grabbing the tool to fix the tool to the shaft core and a loosening state for releasing the tool to separate the tool from the shaft core, and the pull rod component drives the pull claw component to switch between the grabbing state and the loosening state under the drive of the driving assembly;

[0008] A back-lock mechanism is installed between the drive assembly and the mounting shell and connected to the shaft core. Along the axial direction of the shaft core, the back-lock mechanism is used to apply a force to the shaft core away from the first static pressure chamber.

[0009] Furthermore, the driving assembly comprises:

[0010] A hydraulic cylinder, the hydraulic cylinder comprising a cylinder body and a piston, the piston being arranged in the cylinder body and being movable relative to the cylinder body along the axial direction of the shaft core, a third mounting hole being arranged in the piston, the shaft core being sleeved in the third mounting hole on one side outside the first mounting hole, the buckle mechanism being installed between the cylinder body and the mounting housing and connected to the shaft core;

[0011] A crimping component is located in the third mounting hole and at least partially penetrates into the second mounting hole to be connected with the pull rod component. Along the axial direction of the shaft core, the crimping component can drive the pull rod component to move relative to the shaft core under the drive of the piston.

[0012] Furthermore, the buckle mechanism comprises:

[0013] A first buckle assembly, the first buckle assembly is located between the cylinder body and the mounting shell and connected to the cylinder body, and along the axial direction of the shaft core, the first buckle assembly can reciprocate with the cylinder body relative to the mounting shell;

[0014] a second buckle assembly, the second buckle assembly being connected to the shaft core and being located between the outer peripheral surface of the shaft core and the first buckle assembly, and an abutment structure being provided between the second buckle assembly and the first buckle assembly;

[0015] Wherein, in the process of the claw component switching from the grasping state to the releasing state, along the axial direction of the shaft core, the second buckling component has a first state in which it moves with the shaft core relative to the mounting shell and a second state in which it is stationary relative to the mounting shell, and the abutment structure is used to abut the second buckling component with the first buckling component to limit the second buckling component to the second state.

[0016] Furthermore, the abutment structure comprises:

[0017] A first boss, along the radial direction of the shaft core, the first boss is arranged on a side of the first buckle assembly close to the second buckle assembly;

[0018] A second boss, along the radial direction of the shaft core, the second boss is arranged on a side of the second buckle assembly close to the first buckle assembly, and along the axial direction of the shaft core, the second boss is located on a side of the first boss away from the mounting housing;

[0019] Further, along the axial direction of the shaft core, there is a first distance between the first boss and the second boss;

[0020] Wherein, when the second fastening component is in the first state, the value of the first spacing is greater than the value when the second fastening component is in the second state; and / or,

[0021] When the second fastening component is in the second state, the value of the first spacing is not less than 0.3 mm.

[0022] Furthermore, the first buckle assembly includes:

[0023] A mounting seat, wherein a first through hole is arranged in the mounting seat, the shaft core passes through the first through hole and is sleeved in the third mounting hole, the second buckle assembly is located between the outer peripheral surface of the shaft core and the inner wall surface of the first through hole, the abutment structure is arranged between the inner wall surface of the first through hole and the second buckle assembly, and along the axial direction of the shaft core, one end of the mounting seat close to the cylinder body is fixedly connected to the cylinder body;

[0024] An elastic connecting component is connected between the mounting seat and the mounting shell. Along the axial direction of the shaft core, the mounting seat can move closer to or farther away from the mounting shell along with the cylinder body under the elastic deformation of the elastic connecting component.

[0025] Further, along the axial direction of the shaft core, a second through hole is also provided in the mounting seat, the second through hole is located on one side of the first through hole along the radial direction of the shaft core, and along the radial direction of the shaft core, a third boss is provided on the inner wall surface of the second through hole, and the elastic connecting component includes:

[0026] a first bolt, the first bolt comprising a rod and a head at one end of the rod, the side of the rod away from the head passing through the second through hole and connected to the mounting housing, and an installation gap is provided between the third boss and the head along the axial direction of the shaft core;

[0027] A compression spring is sleeved on the rod and located in the installation gap.

[0028] Furthermore, the second fastening assembly includes:

[0029] A first mounting block, the first mounting block is fixedly connected to the outer peripheral surface of the shaft core and is located at one end of the mounting housing close to the cylinder body;

[0030] A second mounting block, along the axial direction of the shaft core, the second mounting block is mounted on an end of the first mounting block away from the mounting housing, and along the radial direction of the shaft core, the second mounting block at least partially protrudes from the outer peripheral surface of the first mounting block to form the first boss;

[0031] a first locking member, wherein the first locking member detachably connects the second mounting block to the first mounting block;

[0032] And / or, the liquid hydrostatic spindle device further comprises:

[0033] A sealing member is sleeved on the outer circumferential surface of the shaft core and is located at one end of the mounting shell close to the buckle mechanism, and is used to seal the mounting gap between the shaft core and the end of the mounting shell close to the buckle mechanism.

[0034] Further, along the radial direction of the shaft core, a limiting hole communicating with the second mounting hole is provided through the shaft core, the limiting hole extends along the axial direction of the shaft core, and the limiting hole is located on a side of the shaft core away from the tool and outside the first mounting hole, and the crimping component includes:

[0035] A pressing block, wherein a third through hole is provided in the pressing block, the pressing block is sleeved on the shaft core through the third through hole and can move relative to the shaft core under the drive of the piston;

[0036] A pressure rod, one end of which is connected to the pressure block and the other end of which is passed through the limiting hole into the second mounting hole and connected to the pull rod component, and the cross-sectional area of ​​the pressure rod is smaller than the minimum size of the limiting hole.

[0037] Furthermore, the pull rod component comprises:

[0038] A pull rod body, the pull rod body is located in the second mounting hole, and opposite ends of the pull rod body are respectively connected to the crimping component and the claw component;

[0039] An elastic member, the elastic member is telescopically sleeved on the pull rod body, along the axial direction of the shaft core, the opposite ends of the elastic member are respectively in contact with the inner wall surface of the second mounting hole and the pull rod body, and the elastic member can be reciprocatedly switched between a compressed state and an extended state under the action of its own elastic force;

[0040] During the process of the elastic member switching from the compressed state to the extended state, the pull rod body is pulled to move in the direction away from the tool until the claw component is in the grasping state. When the pull rod body moves in the direction close to the tool so that the claw component is in the released state, the elastic member switches from the extended state to the compressed state.

[0041] Further, along the axial direction of the shaft core, a mounting portion is provided on one side of the tool close to the shaft core, a first groove is provided in the mounting portion, and the claw component includes:

[0042] A connecting column, the connecting column comprising a first section and a second section, wherein along the radial direction of the shaft core, the maximum width of the first section is smaller than the maximum width of the second section;

[0043] A pulling claw, the pulling claw is connected to the inner wall surface of the first mounting hole, an avoidance hole is arranged in the pulling claw, one end of the pulling rod component away from the hydraulic cylinder passes through the avoidance hole and is connected to the first section, the connecting column can move relative to the pulling claw under the drive of the pulling rod component, and along the circumference of the shaft core, the pulling claw includes a plurality of grabbing pieces arranged at intervals;

[0044] Along the radial direction of the shaft core, the second section stretches the multiple grabbing pieces away from each other so as to press the multiple grabbing pieces between the inner wall surface of the first groove and the outer peripheral surface of the second section. Along the axial direction of the shaft core, the pull rod component moves toward the direction approaching the tool until the grabbing piece is arranged opposite to the first section. Along the radial direction of the shaft core, the multiple grabbing pieces approach each other so as to be separated from the inner wall surface of the first groove.

[0045] On the other hand, the present application also provides a machine tool, characterized in that the machine tool comprises:

[0046] The liquid static pressure spindle device.

[0047] In the present application, the liquid hydrostatic spindle device includes a spindle body, a tool changing mechanism and a back-lock mechanism. A first mounting hole is provided in the mounting shell of the spindle body, and the shaft core of the spindle body is installed in the first mounting hole and can rotate around its own axis. A flange is provided on the outer peripheral surface of the shaft core along one side of its own axial direction, and a first hydrostatic chamber is formed between the bottom side of the flange and the inner wall surface of the first mounting hole along the axial direction of the shaft core. The first hydrostatic chamber is injected with oil during the rotation of the shaft core to reduce the friction resistance between the shaft core and the inner wall surface of the first mounting hole. The grabbing assembly of the tool changing mechanism includes a pull rod component and a pull claw component. The pull rod component is installed in the second mounting hole of the shaft core and connected to the driving assembly. The pull claw component is installed at the end of the shaft core away from the driving assembly and connected to the pull rod component. The pull rod component can drive the pull claw component to switch between a grabbing state and a released state under the drive of the driving assembly, thereby more conveniently realizing the replacement of the tool. The operator only needs to remove the tool when the pull claw component releases the tool, which simplifies the operation of replacing the tool, reduces the tool replacement time, and can improve the machining efficiency of the machine tool using the liquid hydrostatic spindle device.

[0048] At the same time, in the process of the pull rod component driving the claw component to switch from the grasping state to the releasing state, downward pressure is easily applied to the shaft core, so that the shaft core has a movement tendency along its own axial direction to drive the flange to abut against the static pressure cavity surface of the first static pressure cavity close to the flange under the action of the downward pressure, which easily leads to a direct collision between the flange and the static pressure cavity surface. In this regard, the present embodiment also provides a back-knot mechanism, which is installed between the drive assembly and the mounting shell and connected to the shaft core. Along the axial direction of the shaft core, the back-knot mechanism is used to apply a force away from the first static pressure cavity to the shaft core. Under the action of this force, the flange of the shaft core can be prevented from directly colliding with the static pressure wall surface, thereby protecting the static pressure cavity surface from being scratched or worn, ensuring that the friction resistance between the shaft core and the inner wall surface of the first mounting hole will not increase, and improving the rotation accuracy and service life of the shaft core after the tool changing mechanism is set. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0050] Figure 1 A schematic structural diagram of a liquid pressure reduction spindle device provided in one embodiment of the present invention;

[0051] Figure 2 It is a front view of the liquid depressurization spindle device;

[0052] Figure 3 for Figure 2 AA section view;

[0053] Figure 4 for Figure 3 A magnified schematic diagram of part B;

[0054] Figure 5 for Figure 3 A magnified schematic diagram of part C;

[0055] Figure 6 It is a top view of the buckle mechanism;

[0056] Figure 7 for Figure 6 DD cross-sectional view;

[0057] Figure 8 for Figure 1 Schematic diagram of the decomposition of

[0058] Fig. 9 It is a schematic diagram of the structure of the claw component.

[0059] The above drawings include the following reference numerals:

[0060] 10. spindle body; 11. mounting housing; 101. first mounting hole; 102. first static pressure chamber; 103. second static pressure chamber; 111. main housing; 112. connecting block; 113. sealing component;

[0061] 12, shaft core; 121, flange; 122, second mounting hole; 123, limiting hole; 124, abutment platform; 125, second groove;

[0062] 20. tool changing mechanism; 21. pull rod component; 211. pull rod body; 212. elastic member; 213. first abutment block; 214. nut column; 215. second abutment block;

[0063] 22, claw component; 221, connecting column; 2211, first section; 2212, second section; 222, claw; 2221, grab piece; 2222, avoidance hole;

[0064] 23, hydraulic cylinder; 231, cylinder body; 232, piston; 2321, third mounting hole; 3211, fourth boss;

[0065] 24, crimping component; 241, pressing block; 411, third through hole; 242, pressing rod;

[0066] 30, reverse buckle mechanism; 31, first buckle assembly; 311, mounting seat; 3111, first through hole; 3112, second through hole; 1121, third boss;

[0067] 312, elastic connecting component; 3121, first bolt; 3122, compression spring;

[0068] 32. second buckle assembly; 321. first mounting block; 322. second mounting block; 323. first locking member;

[0069] 33. abutment structure; 331. first boss; 332. second boss;

[0070] 40. Seals;

[0071] 50. Cutting tool; 51. Mounting portion; 511. First groove; 512. Protrusion. DETAILED DESCRIPTION

[0072] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0073] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0075] When replacing the tool 50 of the existing hydrostatic spindle, the operator is usually required to perform cumbersome disassembly and connection operations, which is cumbersome and inconvenient, resulting in a long replacement time for the tool 50 and low machining efficiency of the machine tool using the hydrostatic spindle. In view of this, the first embodiment of the present invention provides a hydrostatic spindle device, see Figures 1 to 9 The liquid depressurization spindle device includes a spindle body 10, a tool changing mechanism 20 and a buckle mechanism 30.

[0076] like Figures 1 to 3As shown, the main shaft body 10 includes a mounting shell 11 and a shaft core 12. A first mounting hole 101 is provided in the mounting shell 11, and the shaft core 12 is installed in the first mounting hole 101 and can rotate around its own axis. A flange 121 is provided on the outer peripheral surface of the shaft core 12 along one side of its own axial direction, and a first static pressure chamber 102 is formed between the bottom side of the flange 121 and the inner wall surface of the first mounting hole 101 along the axial direction of the shaft core 12. After the first static pressure chamber 102 is filled with oil, an oil film can be formed between the shaft core 12 and the inner wall surface of the first mounting hole 101, thereby reducing the friction resistance of the shaft core 12 during operation. A second mounting hole 122 is provided in the shaft core 12 along the axial direction of the shaft core 12.

[0077] like Figures 3 to 5 As shown, the tool changing mechanism 20 includes a driving component and a grasping component, the grasping component includes a pull rod component 21 and a pull claw component 22, along the axial direction of the shaft core 12, the driving component is installed at one end of the mounting shell 11, the pull rod component 21 is installed in the second mounting hole 122 and is connected to the driving component, the pull claw component 22 is installed at the end of the shaft core 12 away from the driving component and is connected to the pull rod component 21, the pull claw component 22 has a grasping state of grasping the tool 50 to fix the tool 50 to the shaft core 12 and a loosening state of releasing the tool 50 to separate the tool 50 from the shaft core 12, the pull rod component 21 drives the pull claw component 22 to switch between the grasping state and the loosening state under the drive of the driving component, thereby, the tool 50 can be replaced conveniently and quickly by starting the driving component, when the pull claw component 22 is in the loosening state, the operator only needs to remove the tool 50, and then grasp the new tool 50 through the pull claw component 22 to connect the tool 50 and the shaft core 12 together.

[0078] The inner wall surface of the first mounting hole 101 near the tool 50 is provided with a first avoidance groove, the first avoidance groove is recessed in the direction away from the shaft core 12, and the flange 121 and the first avoidance groove are arranged along the axial bottom of the shaft core 12 to form a first static pressure chamber 102. Specifically, the mounting housing 11 in this embodiment may include a main housing 111, a connecting block 112 and a sealing component 113. A first hole is provided in the main housing 111, and the connecting block 112 is sealed and connected between the mounting housing and the sealing component 113. Along the axial direction of the shaft core 12, a second hole connected to the first hole is provided in the connecting block 112 and the sealing component 113, and the first hole and the second hole form a first mounting hole 101. A second avoidance groove is provided on the side of the first hole close to the connecting block 112. The connecting block 112 protrudes from the second avoidance groove away from the wall of the shaft core 12 and is surrounded by the second avoidance groove to form a first avoidance groove. The flange 121 is located in the first avoidance groove. Along the axial direction of the shaft core 12, an oil groove is provided on the surface of the connecting block 112 close to the flange 121, and the oil groove is arranged opposite to the flange 121. Then, the first static pressure chamber 102 is a static pressure chamber formed by the flange 121 and the oil groove on the connecting block 112. Since the first static pressure chamber 102 in this embodiment plays an important role in the stable operation of the shaft core 12, in the process of the pull rod component 21 pushing the claw component 22 to release the tool 50, the downward pressure of the pull rod component 21 is relatively large, and this downward pressure has a tendency to drive the shaft core 12 to move in the direction of the tool 50 along its own axial direction, which easily leads to direct collision between the flange 121 and the static pressure chamber surface of the first static pressure chamber 102 close to itself, causing damage to the static pressure wall surface, resulting in an increase in the friction resistance between the shaft core 12 and the inner wall surface of the first mounting hole 101, which is the surface of the connecting block 112 close to the flange 121. In this regard, while ensuring that the liquid static pressure spindle can realize the replacement of the tool 50, in order to avoid the first static pressure chamber 102 surface from being damaged, this embodiment is also provided with a back-lock mechanism 30, which is installed between the drive assembly and the mounting housing 11 and connected to the shaft core 12, and along the axial direction of the shaft core 12, the back-lock mechanism 30 is used to apply a force away from the first static pressure chamber 102 to the shaft core 12. Therefore, in the process of the pull rod component 21 pushing the claw component 22 to release the tool 50, the force applied by the reverse locking mechanism 30 can overcome the downward pressure of the shaft core 12, thereby ensuring that the flange 121 on the shaft core 12 will not directly collide with the static pressure cavity surface, thereby avoiding damage to the static pressure cavity surface.

[0079] In addition, if Figure 5 As shown, in this embodiment, at least two second static pressure chambers 103 are formed between the outer circumference of the shaft core 12 and the inner circumference of the first mounting hole 101, so that the friction resistance between the shaft core 12 and the mounting shell 11 is further reduced through the second static pressure chambers 103, thereby improving the rotation accuracy and efficiency.

[0080] It can be seen that in this embodiment, the liquid hydrostatic spindle device includes a spindle body 10, a tool changing mechanism 20 and a buckle mechanism 30. A first mounting hole 101 is provided in the mounting housing 11 of the spindle body 10. The shaft core 12 of the spindle body 10 is installed in the first mounting hole 101 and can rotate around its own axis. A flange 121 is provided on the outer peripheral surface of the shaft core 12 along one side of its own axial direction. Along the axial direction of the shaft core 12, a first static pressure chamber 102 is formed between the bottom side of the flange 121 and the inner wall surface of the first mounting hole 101. The first static pressure chamber 102 will be injected with oil during the rotation of the shaft core 12 to reduce the friction resistance between the shaft core 12 and the inner wall surface of the first mounting hole 101. The grabbing assembly of the tool changing mechanism 20 includes a pull rod component 21 and a pull claw component 22. The pull rod component 21 is installed in the second mounting hole 122 of the shaft core 12 and is connected to the driving component. The pull claw component 22 is installed at the end of the shaft core 12 away from the driving component and is connected to the pull rod component 21. The pull rod component 21 can drive the pull claw component 22 to switch between a grabbing state and a released state under the drive of the driving component, so as to more conveniently realize the replacement of the tool 50. The operator only needs to remove the tool 50 when the pull claw component 22 releases the tool 50, which simplifies the operation of replacing the tool 50, reduces the replacement time of the tool 50, and can improve the machining efficiency of the machine tool using the liquid hydrostatic spindle device.

[0081] At the same time, in the process that the pull rod component 21 drives the claw component 22 to switch from the grasping state to the releasing state, it is easy to apply downward pressure on the shaft core 12, so that the shaft core 12 has a movement tendency along its own axial direction to drive the flange 121 to abut against the static pressure cavity surface of the first static pressure cavity 102 close to the flange 121 under the action of the downward pressure, which easily causes the flange 121 to directly collide with the static pressure cavity surface. In this regard, the present embodiment also provides a back-knot mechanism 30, which is installed between the drive assembly and the mounting housing 11 and connected to the shaft core 12. Along the axial direction of the shaft core 12, the back-knot mechanism 30 is used to apply a force away from the first static pressure cavity 102 to the shaft core 12. Under the action of this force, the flange 121 of the shaft core 12 can be prevented from directly colliding with the static pressure wall surface, thereby protecting the static pressure cavity surface from being damaged or worn, ensuring that the friction resistance between the shaft core 12 and the inner wall surface of the first mounting hole 101 will not increase, and improving the rotation accuracy and service life of the shaft core 12 after the tool changing mechanism 20 is set.

[0082] In this embodiment, if Figure 8As shown, along the radial direction of the shaft core 12, a limiting hole 123 connected to the second mounting hole 122 is provided in the shaft core 12, and the limiting hole 123 extends along the axial direction of the shaft core 12, that is, the limiting hole 123 has a length along the axial direction of the shaft core 12, and the length limits the moving distance of the pull rod component 21 that can reciprocate along the axial direction of the shaft core 12. And the limiting hole 123 is located on the side of the shaft core 12 away from the tool 50 and outside the first mounting hole 101, so as to facilitate connection with the drive assembly. The drive assembly in this embodiment includes a hydraulic cylinder 23 and a crimping component 24. The hydraulic cylinder 23 includes a cylinder body 231 and a piston 232. The piston 232 is arranged in the cylinder body 231 and can move relative to the cylinder body 231 along the axial direction of the shaft core 12. A hydraulic chamber is arranged in the cylinder body 231, and hydraulic oil is introduced into the hydraulic chamber or hydraulic oil flows out of the hydraulic chamber to drive the piston 232 to move relative to the cylinder body 231. A third mounting hole 2321 is provided in the piston 232, and the side of the shaft core 12 outside the first mounting hole 101 is sleeved in the third mounting hole 2321. The buckle mechanism 30 is installed between the cylinder body 231 and the mounting housing 11 and connected to the side of the shaft core 12 outside the first mounting hole 101, so that the buckle mechanism 30 can apply a force on the shaft core 12, and the assembled overall structure is compact and reliable.

[0083] Among them, the crimping component 24 is located in the third mounting hole 2321 and at least partially penetrates into the second mounting hole 122 (specifically penetrates into the second mounting hole 122 along the limiting hole 123) and is connected to the rod component 21. Along the axial direction of the shaft core 12, the crimping component 24 can drive the rod component 21 to move relative to the shaft core 12 under the drive of the piston 232, so that the rod component 21 drives the claw component 22 to switch from the grasping state to the releasing state. In other words, this embodiment can push the crimping component 24 to move along the axial direction of the shaft core 12 relative to the inner wall surface of the limiting hole 123 through the piston 232, and then drive the rod component 21 connected thereto to be pressed down along the axial direction of the shaft core 12 through the crimping component 24 until the claw component 22 switches from the grasping state to the releasing state. The driving process is stable and reliable, and the overall structure is simple, compact, and easy to assemble.

[0084] In this embodiment, the piston 232 can push the crimping component 24 by directly connecting the crimping component 24 with the inner wall surface of the third mounting hole 2321. However, in order to further improve the structural strength of the hydraulic cylinder 23 and the convenience of assembling the crimping component 24, a fourth boss 3211 is provided in the third mounting hole 2321 in this embodiment. The crimping component 24 includes a pressing block 241 and a pressing rod 242. A third through hole 411 is provided in the pressing block 241. The pressing block 241 is sleeved on the shaft core 12 through the third through hole 411 and can move relative to the shaft core 12 under the drive of the piston 232. Along the axial direction of the shaft core 12, the fourth boss 3211 is located on the side of the pressing block 241 away from the mounting housing 11, and the pressing block 241 is arranged opposite to the fourth boss 3211 at least partially along the radial direction of the shaft core 12, so that the pressing block 241 can be pushed to move by the fourth boss 3211 when the piston 232 is pressed down. One end of the pressure rod 242 is connected to the pressure block 241, and the other end is inserted into the second mounting hole 122 along the limiting hole 123 and connected to the pull rod component 21. The cross-sectional area of ​​the pressure rod 242 is smaller than the minimum size of the limiting hole 123. Thus, while the pressure block 241 and the pull rod component 21 are connected, the pressure rod 242 can be ensured to drive the pull rod component 21 to move a predetermined distance. The crimping structure formed by the pressure block 241 and the pressure rod 242 in this embodiment is not only convenient for assembly, but also avoids opening corresponding holes in the hydraulic cylinder 23 to connect the crimping component 24, thereby ensuring the structural strength of the hydraulic cylinder 23.

[0085] See also Figures 3 to 7 The buckle mechanism 30 in this embodiment includes a first buckle assembly 31 and a second buckle assembly 32. The first buckle assembly 31 is located between the cylinder body 231 and the mounting housing 11 and is connected to the cylinder body 231. Along the axial direction of the shaft core 12, the first buckle assembly 31 can reciprocate relative to the mounting housing 11 with the cylinder body 231. The second buckle assembly 32 is connected to the shaft core 12 and is located between the outer peripheral surface of the shaft core 12 and the first buckle assembly 31. An abutment structure 33 is provided between the second buckle assembly 32 and the first buckle assembly 31.

[0086] Among them, in the process of switching the claw component 22 from the grasping state to the releasing state, along the axial direction of the shaft core 12, the second buckle component 32 has a first state in which it moves with the shaft core 12 relative to the mounting shell 11 and a second state in which it is stationary relative to the mounting shell 11. The abutment structure 33 is used to abut the second buckle component 32 with the first buckle component 31 to limit the second buckle component 32 to the second state. Therefore, when the shaft core 12 has a tendency to move toward the direction of the tool 50, the second buckle component 32 is limited to the second state through the abutment structure 33, so as to apply a force away from the first static pressure chamber 102 to the shaft core 12, thereby preventing the shaft core 12 from driving the flange 121 to continue to move downward and colliding with and damaging the static pressure chamber surface of the first static pressure chamber 102, so as to ensure that the shaft core 12 can operate stably.

[0087] Specifically, during the process of the hydraulic cylinder 23 driving the claw component 22 to release the tool 50, hydraulic oil is introduced into the hydraulic cylinder 23, and the piston 232 of the hydraulic cylinder 23 is pressed down along the axial direction of the shaft core 12 toward the direction close to the tool 50, thereby pushing the crimping component 24 to drive the pull rod component 21 to press down. Since the downward pressure is very large, in order not to damage the surface of the static pressure oil chamber, during the downward pressure, the piston 232 generates downward pressure on the shaft core 12 and the second buckle component 32 connected to the shaft core 12. At this time, since the first buckle component 31 of the reverse buckle mechanism 30 can apply a reverse force to the second buckle component 32 through the abutment structure 33, the piston 232 and the cylinder body 231 have a tendency to be pushed upward in the direction away from the tool 50. Since the first fastening assembly 31 can reciprocate with the cylinder body 231 relative to the mounting housing 11, when the piston 232 is pressed down, the cylinder body 231 can drive the first fastening assembly 31 to move slightly upward in the direction away from the tool 50 under the action of the reaction force applied by the piston 232, and the cylinder body 231 and the first fastening assembly 31 are pushed upward until the abutment structure 33 restricts the second fastening assembly 32 to the second state, thereby making the thrust generated by the piston 232 of the hydraulic cylinder 23 not directly act on the static pressure cavity surface, that is, the shaft core 12 will not drive the flange 121 to directly collide with the static pressure cavity surface, thereby protecting the static pressure cavity surface. Moreover, since the first fastening assembly 31 is slightly pushed upward with the cylinder body 231, the corresponding thrust will not directly act on the end face of the mounting housing 11, which also improves the structural stability of the mounting housing 11, making the overall structure of the liquid hydrostatic spindle device more stable and reliable.

[0088] Among them, Figure 7 As shown, the abutment structure 33 in this embodiment includes a first boss 331 and a second boss 332. Along the radial direction of the shaft core 12, the first boss 331 is arranged on the side of the first buckle assembly 31 close to the second buckle assembly 32. Along the radial direction of the shaft core 12, the second boss 332 is arranged on the side of the second buckle assembly 32 close to the first buckle assembly 31. Along the axial direction of the shaft core 12, the second boss 332 is located on the side of the first boss 331 away from the mounting shell 11. Therefore, in this embodiment, by making the first boss 331 and the second boss 332 close to each other abut against each other, during the process of the claw component 22 performing the knife loosening operation, the second buckle assembly 32 can be restricted to the second state, thereby ensuring that the shaft core 12 will not drive the flange 121 to collide with the static pressure cavity surface under the thrust of the piston 232 of the hydraulic cylinder 23, thereby improving the protection performance of the first static pressure cavity 102.

[0089] Among them, along the axial direction of the shaft core 12, there is a first spacing between the first boss 331 and the second boss 332, and the value of the first spacing when the second buckle assembly 32 is in the first state is larger than the value when the second buckle assembly 32 is in the second state. In other words, when the second buckle assembly 32 is in the second state, there is a smaller gap between the first boss 331 and the second boss 332 (i.e., a first spacing with a smaller value), thereby protecting the static pressure cavity surface while ensuring that the shaft core 12 will not be affected in its own rotation due to the first boss 331 and the second boss 332 abutting too closely, further improving the stability and reliability of the shaft core 12 during operation.

[0090] In some embodiments, when the second buckle assembly 32 is in the second state, the value of the first spacing is not less than 0.3 mm (mm is a unit of millimeter). For example, the value of the first spacing can be one of 0.3 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.4 mm, etc. Thus, when the second buckle assembly 32 is in the second state, the rotation accuracy and stability of the shaft core 12 are ensured by making the value of the first spacing not less than 0.3 mm.

[0091] like Figure 7 and Figure 8 As shown, the first buckle assembly 31 in this embodiment includes a mounting seat 311 and an elastic connecting component 312. A first through hole 3111 is provided in the mounting seat 311, and the shaft core 12 passes through the first through hole 3111 and is sleeved in the third mounting hole 2321. The second buckle assembly 32 is located between the outer peripheral surface of the shaft core 12 and the inner wall surface of the first through hole 3111. The abutment structure 33 is provided between the inner wall surface of the first through hole 3111 and the second buckle assembly 32. Specifically, the first boss 331 of the abutment structure 33 is convexly provided on the inner wall surface of the first through hole 3111. Along the axial direction of the shaft core 12, one end of the mounting seat 311 close to the cylinder body 231 is fixedly connected to the cylinder body 231. The elastic connecting component 312 is connected between the mounting seat 311 and the mounting housing 11. Along the axial direction of the shaft core 12, the mounting seat 311 can move with the cylinder body 231 under the elastic deformation of the elastic connecting component 312 to approach or move away from the mounting housing 11.

[0092] Therefore, in this embodiment, the mounting seat 311 is connected to the mounting housing 11 through the elastic connecting component 312. When the hydraulic cylinder 23 drives the claw component 22 to release the tool 50, the piston 232 pushes the crimping component 24 to drive the pull rod component 21 to press down. Since the downward pressure is very large, in order not to damage the surface of the static oil chamber, during the downward pressure, the piston 232 generates downward pressure on the shaft core 12 and the second buckle assembly 32 connected to the shaft core 12. At this time, since the mounting seat 311 of the reverse buckle mechanism 30 can apply a reverse force to the second buckle assembly 32 through the abutment structure 33, the piston 232 and the cylinder body 231 have a tendency to be pushed upward in the direction away from the tool 50. Since the mounting seat 311 is elastically connected to the mounting housing 11 through the elastic connecting member 312, when the piston 232 is pressed down, the cylinder body 231 can drive the mounting seat 311 to move slightly upward in the direction away from the tool 50 under the action of the reaction force applied by the piston 232, and the cylinder body 231 and the mounting seat 311 are pushed upward until the abutment structure 33 restricts the second buckle assembly 32 to the second state, which not only prevents the thrust generated by the piston 232 of the hydraulic cylinder 23 from directly acting on the static pressure cavity surface, thus protecting the static pressure cavity surface, but also improves the efficiency of preventing the shaft core 12 from being further pressed down. Moreover, since the mounting seat 311 can be slightly pushed up with the cylinder body 231, the corresponding thrust will not directly act on the end face of the mounting housing 11, thus improving the structural stability of the mounting housing 11.

[0093] The mounting seat 311 can be connected to the cylinder body 231 by screws. Along the axial direction of the shaft core 12, a second through hole 3112 is also provided in the mounting seat 311. The second through hole 3112 is located on one side of the first through hole 3111 along the radial direction of the shaft core 12. Along the radial direction of the shaft core 12, a third boss 1121 is provided on the inner wall surface of the second through hole 3112. The elastic connecting component 312 includes a first bolt 3121 and a compression spring 3122. The first bolt 3121 includes a rod and a head at one end of the rod. The side of the rod away from the head passes through the second through hole 3112 and is connected to the mounting housing 11, and the rod and the second through hole 3112 are clearance-matched. Along the axial direction of the shaft core 12, there is an installation gap between the third boss 1121 and the head, and the compression spring 3122 is sleeved on the rod and located in the installation gap. Thus, when the compression spring 3122 is in a natural state, the mounting seat 311 can be abutted between the cylinder body 231 and the mounting housing 11. When the mounting seat 311 moves upward along the axial direction of the shaft core 12 along with the cylinder body 231, the compression spring 3122 is compressed to ensure the freedom of movement of the mounting seat 311. At the same time, in this embodiment, the first bolt 3121 and the compression spring 3122 are installed in the second through hole 3112 of the mounting seat 311 to realize the movable connection between the mounting seat 311 and the mounting housing 11, which is not only convenient and easy to assemble, but also makes the overall structure of the buckle mechanism 30 more compact and reliable.

[0094] like Figure 7 As shown, the second fastening assembly 32 in this embodiment includes a first mounting block 321, a second mounting block 322 and a first locking member 323. The first mounting block 321 is fixedly connected to the outer circumference of the shaft core 12 and is located at one end of the mounting housing 11 close to the cylinder body 231. Along the axial direction of the shaft core 12, the second mounting block 322 is mounted on one end of the first mounting block 321 away from the mounting housing 11, and along the radial direction of the shaft core 12, the second mounting block 322 at least partially protrudes from the outer circumference of the first mounting block 321 to form a first boss 331. When both the first mounting block 321 and the second mounting block 322 are circular mounting blocks, the first mounting block 321 and the second mounting block 322 are coaxially arranged with the shaft core 12, and the diameter of the second mounting block 322 is larger than the diameter of the first mounting block 321, so that the portion of the second mounting block 322 protruding from the first mounting block 321 forms the corresponding first boss 331. At this time, the first boss 331 is also a circular ring structure extending along the circumference of the shaft core 12, which can improve the reliability when abutting with the second boss 332. Moreover, when the first mounting block 321 and the second mounting block 322 of the circular mounting block structure are provided with corresponding holes and sleeves on the shaft core 12 for corresponding installation, the installation is simple and convenient, and the structural strength of the shaft core 12 can be ensured. The first locking member 323 detachably connects the second mounting block 322 to the first mounting block 321. The first locking member 323 in this embodiment can specifically be a locking structure such as a screw or a bolt.

[0095] In this embodiment, Figure 3 and Figure 8 As shown, the liquid hydrostatic spindle device also includes a seal 40, which is sleeved on the outer peripheral surface of the shaft core 12 and located at one end of the mounting housing 11 close to the buckle mechanism 30. The seal 40 is used to seal the installation gap between the shaft core 12 and the end of the mounting housing 11 close to the buckle mechanism 30. Therefore, when the mounting seat 311 of the buckle mechanism 30 is driven and pushed up by the cylinder body 231 and there is a gap between it and the end of the mounting housing 11, the seal 40 can prevent external dust and liquid from entering the mounting housing 11 along the corresponding gap to cause pollution and blockage to the internal components. The seal 40 in this embodiment can be specifically a flexible dustproof ring, which is easy to assemble and has good waterproof and dustproof effects.

[0096] In this embodiment, if Figures 3 to 5As shown, the pull rod component 21 includes a pull rod body 211 and an elastic member 212. The pull rod body 211 is located in the second mounting hole 122, and the opposite ends of the pull rod body 211 are respectively connected to the crimping component 24 and the claw component 22. The elastic member 212 is telescopically sleeved on the pull rod body 211, and along the axial direction of the shaft core 12, the opposite ends of the elastic member 212 are respectively abutted against the inner wall surface of the second mounting hole 122 and the pull rod body 211, and the elastic member 212 can be reciprocated between the compressed state and the stretched state under the action of its own elastic force. In the process of the elastic member 212 switching from the compressed state to the stretched state, the pull rod body 211 is pulled to move in the direction away from the tool 50 until the claw component 22 is in the grasping state, and when the pull rod body 211 moves in the direction close to the tool 50 so that the claw component 22 is in the released state, the elastic member 212 switches from the stretched state to the compressed state. Therefore, in this embodiment, the pull rod body 211 can be reset through the elastic member 212. When the tool 50 is aligned with the claw component 22 to ensure that the claw component 22 can grab the tool 50 and connect it to the shaft core 12, there is no need to start the driving component again to drive the pull rod body 211 to move, and the pull rod body 211 can be abutted to the position where the claw component 22 grabs the tool 50.

[0097] Specifically, Figures 3 to 5 As shown, the elastic member 212 in this embodiment can be specifically a disc spring elastic structure, which includes a plurality of disc springs sleeved on the pull rod body 211. Along the axial direction of the shaft core 12, the pull rod body 211 is sleeved with a first abutment block 213 on the opposite sides of the disc spring elastic structure, and the inner wall surface of the second mounting hole 122 is also convexly provided with an abutment platform 124, which abuts against the abutment block of the disc spring elastic structure close to the tool 50, and the pull rod body 211 is also sleeved with a second abutment block 215 on the side close to the crimping component 24, and the second abutment block 215 is fixedly connected to the pull rod body 211, and the first abutment block 213 on the side of the disc spring elastic structure away from the abutment platform 124 is located between the disc spring elastic structure and the second abutment block 215. When the pull rod body 211 moves toward the direction close to the tool 50, the second abutment block 215 abuts against the first abutment block 213 and compresses the disc spring elastic structure under the action of the thrust; when the tool 50 needs to be grabbed and replaced, the disc spring elastic structure gradually stretches from the compressed state until the first abutment block 213 close to the side of the abutment platform 124 abuts against the abutment platform 124, and the pressing block 241 of the crimping component 24 abuts against the fourth boss 3211.

[0098] During the compression of the elastic member 212 in this embodiment, the elastic member 212 will also exert pressure on the shaft core 12. For example, when the first abutment block 213 abuts against the abutment platform 124, the first abutment block 213 presses down the abutment platform 124, so that the shaft core 12 has a tendency to drive the flange 121 to move closer to the first static pressure chamber 102 under the pressure generated by the compression of the elastic member 212. This embodiment uses the reverse lock mechanism 30 to offset the shaft core 12 driving the flange 121 to collide with the static pressure chamber surface of the first static pressure chamber 102, to ensure that the static pressure chamber surface is not damaged by the collision.

[0099] like Figure 3 and Figure 8 As shown, the pull rod component 21 in this embodiment also includes a nut column 214. Along the radial direction of the shaft core 12, a hole position connected to the limiting hole 123 can be set through the nut column 214 to enable the pressure rod 242 to be inserted into the hole position, and the pressure rod 242 and the pull rod body 211 are fixedly connected together through a second locking member (such as a bolt), so that the assembly is efficient and convenient.

[0100] Along the axial direction of the shaft core 12, a mounting portion 51 is provided on one side of the tool 50 close to the shaft core 12, and a first groove 511 is provided in the mounting portion 51. The claw component 22 includes a connecting column 221 and a claw 222. The connecting column 221 includes a first section 2211 and a second section 2212. Along the radial direction of the shaft core 12, the maximum width of the first section 2211 is smaller than the maximum width of the second section 2212. For example, when the connecting column 221 is a cylindrical structure, the diameter of the first section 2211 is smaller than the diameter of the second section 2212, so that the second section 2212 forms a boss structure.

[0101] like Figure 3 and Fig. 9 As shown, the claw 222 is connected to the inner wall of the first mounting hole 101, and a relief hole 2222 is provided in the claw 222. The end of the rod body 211 of the rod component 21 away from the hydraulic cylinder 23 passes through the relief hole 2222 and is connected to the first section 2211, so that the connecting column 221 can move relative to the claw 222 under the drive of the rod body 211. Fig. 9As shown, along the circumference of the shaft core 12, the pull claw 222 includes a plurality of grabbing pieces 2221 arranged at intervals. The grabbing pieces 2221 can be elastically deformed so that the plurality of grabbing pieces 2221 can be close to or away from each other. When the pull claw component 22 is in the grasping state, along the radial direction of the shaft core 12, the second section 2212 stretches the plurality of grabbing pieces 2221 in a direction away from each other, so as to press the plurality of grabbing pieces 2221 between the inner wall surface of the first groove 511 and the outer peripheral surface of the second section 2212. Along the axial direction of the shaft core 12, the pull rod body 211 moves in a direction close to the tool 50 until the grabbing piece 2221 is arranged opposite to the first section 2211. Along the radial direction of the shaft core 12, the plurality of grabbing pieces 2221 are close to each other to separate from the inner wall surface of the first groove 511, thereby realizing the tool loosening operation. That is, when the second section 2212 is at least partially arranged opposite to the grabbing piece 2221, the multiple grabbing pieces 2221 can be moved away from each other along the radial direction of the second section 2212 to press against the inner wall surface of the first groove 511 and the outer peripheral surface of the second section 2212, that is, the multiple grabbing pieces 2221 are supported by the boss structure of the second section 2212, thereby achieving the grasping of the tool 50. Along the axial direction of the shaft core 12, the pull rod body 211 moves toward the direction close to the tool 50 until the grabbing piece 2221 is arranged opposite to the first section 2211. Since the size of the first section 2211 is smaller, the multiple grabbing pieces 2221 are moved closer to each other along the radial direction of the first section 2211 to separate from the inner wall surface of the first groove 511, thereby achieving the release of the tool 50. A snap-in protrusion is provided on the outer side of the top of the grabbing piece 2221 away from the hydraulic cylinder 23, and a snap-in groove is provided on the inner peripheral wall of the first groove 511. When the grabbing piece 2221 is supported by the second section 2212, the snap-in protrusion snaps in and presses against the snap-in groove to grasp the tool 50.

[0102] like Figure 5As shown, the bottom end of the shaft core 12 away from the hydraulic cylinder 23 is provided with a second groove 125, and the second groove 125 is connected to the first mounting hole 101. The second groove 125 is adapted to the mounting portion 51 of the tool 50, and the mounting portion 51 of the tool 50 is placed in the second groove 125. When the pull rod body 211 pulls the second section 2212 of the connecting column 221 to support the grabbing piece 2221, the tool 50 is firmly grasped, and the second groove 125 can improve the connection strength between the tool 50 and the shaft core 12. The pull rod body 211 pushes the connecting column 221 to move away from the hydraulic cylinder 23 until the first section 2211 is arranged opposite to the grabbing piece 2221 and the multiple grabbing pieces 2221 are gathered, and the grabbing piece 2221 and the outer peripheral wall of the first groove 511 are separated, so that the tool 50 is released. The outer peripheral surface of the mounting portion 51 is also provided with a protrusion 512, and the protrusion 512 abuts against the bottom end surface of the shaft core 12. At this time, in order to save effort when removing the tool 50, a ventilation duct can be set in the outer wall of the shaft core 12. One end of the ventilation duct can be connected to the blowing device through a corresponding pipeline, and the other end extends to the bottom end of the shaft core 12 and is arranged opposite to the protrusion 512. When the blowing device blows air into the ventilation duct, an external force can be applied to the protrusion 512 to generate a loose gap between the tool 50 and the shaft core 12, thereby saving effort to remove the tool 50.

[0103] The second embodiment of the present invention further provides a machine tool, which includes a liquid hydrostatic spindle device. The structure of the liquid hydrostatic spindle device is specifically referred to the content provided in the first embodiment of the present invention, and this embodiment will not be repeated here. The machine tool in this embodiment can specifically be a vertical grinder.

[0104] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0105] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0106] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid hydrostatic spindle device, characterized in that: include: A spindle body (10), the spindle body (10) comprising a mounting shell (11) and a shaft core (12), the mounting shell (11) being provided with a first mounting hole (101), the shaft core (12) being installed in the first mounting hole (101) and being rotatable around its own axis, the shaft core (12) being provided with a flange (121) on its outer peripheral surface along one axial side thereof, a first static pressure chamber (102) being formed between the bottom side of the flange (121) and the inner wall surface of the first mounting hole (101) along the axial direction of the shaft core (12), and a second mounting hole (122) being provided in the shaft core (12) along the axial direction of the shaft core (12); A tool changing mechanism (20), the tool changing mechanism (20) comprising a driving assembly and a grasping assembly, the grasping assembly comprising a pull rod component (21) and a pull claw component (22), the driving assembly being mounted on one end of the mounting shell (11) along the axial direction of the shaft core (12), the pull rod component (21) being mounted in the second mounting hole (122) and being connected to the driving assembly, the pull claw component (22) being mounted on one end of the shaft core (12) away from the driving assembly and being connected to the pull rod component (21), the pull claw component (22) having a grasping state for grasping a tool (50) to fix the tool (50) to the shaft core (12) and a releasing state for releasing the tool (50) to separate the tool (50) from the shaft core (12), the pull rod component (21) driving the pull claw component (22) to switch between the grasping state and the releasing state under the drive of the driving assembly; A back-lock mechanism (30) is installed between the drive assembly and the mounting housing (11) and connected to the shaft core (12). Along the axial direction of the shaft core (12), the back-lock mechanism (30) is used to apply a force to the shaft core (12) that deviates from the first static pressure chamber (102).

2. The hydrostatic spindle device according to claim 1, characterized in that: The drive assembly comprises: A hydraulic cylinder (23), the hydraulic cylinder (23) comprising a cylinder body (231) and a piston (232), the piston (232) being arranged in the cylinder body (231) and being movable relative to the cylinder body (231) along the axial direction of the shaft core (12), a third mounting hole (2321) being arranged in the piston (232), the shaft core (12) being sleeved in the third mounting hole (2321) on a side located outside the first mounting hole (101), the buckle mechanism (30) being installed between the cylinder body (231) and the mounting housing (11) and being connected to the shaft core (12); A crimping component (24), wherein the crimping component (24) is located in the third mounting hole (2321) and at least partially penetrates into the second mounting hole (122) to be connected with the pull rod component (21); along the axial direction of the shaft core (12), the crimping component (24) can drive the pull rod component (21) to move relative to the shaft core (12) under the drive of the piston (232).

3. The hydrostatic spindle device according to claim 2, characterized in that: The buckle mechanism (30) comprises: a first buckle assembly (31), the first buckle assembly (31) being located between the cylinder body (231) and the mounting shell (11) and connected to the cylinder body (231), and being capable of reciprocating relative to the mounting shell (11) along the axial direction of the shaft core (12) along with the cylinder body (231); a second buckle assembly (32), the second buckle assembly (32) being connected to the shaft core (12) and being located between the outer peripheral surface of the shaft core (12) and the first buckle assembly (31), and an abutment structure (33) being provided between the second buckle assembly (32) and the first buckle assembly (31); In the process of the claw component (22) switching from the grasping state to the releasing state, along the axial direction of the shaft core (12), the second buckling component (32) has a first state in which it moves relative to the mounting shell (11) along the shaft core (12) and a second state in which it is stationary relative to the mounting shell (11), and the abutment structure (33) is used to abut the second buckling component (32) with the first buckling component (31) to limit the second buckling component (32) to the second state.

4. The hydrostatic spindle device according to claim 3, characterized in that: The abutment structure (33) comprises: A first boss (331), along the radial direction of the shaft core (12), the first boss (331) being arranged on a side of the first buckle assembly (31) close to the second buckle assembly (32); The second boss (332) is arranged on a side of the second buckle assembly (32) close to the first buckle assembly (31) along the radial direction of the shaft core (12), and is located on a side of the first boss (331) away from the mounting shell (11) along the axial direction of the shaft core (12).

5. The hydrostatic spindle device according to claim 4, characterized in that: Along the axial direction of the shaft core (12), there is a first distance between the first boss (331) and the second boss (332); Wherein, when the second buckling component (32) is in the first state, the value of the first spacing is greater than the value when the second buckling component (32) is in the second state; and / or, When the second buckle assembly (32) is in the second state, the value of the first spacing is not less than 0.3 mm.

6. The hydrostatic spindle device according to claim 3, characterized in that: The first buckle assembly (31) comprises: A mounting seat (311), wherein a first through hole (3111) is arranged in the mounting seat (311), the shaft core (12) passes through the first through hole (3111) and is sleeved in the third mounting hole (2321), the second buckle assembly (32) is located between the outer peripheral surface of the shaft core (12) and the inner wall surface of the first through hole (3111), the abutment structure (33) is arranged between the inner wall surface of the first through hole (3111) and the second buckle assembly (32), and along the axial direction of the shaft core (12), one end of the mounting seat (311) close to the cylinder body (231) is fixedly connected to the cylinder body (231); An elastic connecting component (312) is connected between the mounting seat (311) and the mounting shell (11). Along the axial direction of the shaft core (12), the mounting seat (311) can move closer to or farther away from the mounting shell (11) along with the cylinder body (231) under the elastic deformation of the elastic connecting component (312).

7. The hydrostatic spindle device according to claim 6, characterized in that: A second through hole (3112) is also provided in the mounting seat (311) along the axial direction of the shaft core (12); the second through hole (3112) is located on one side of the first through hole (3111) along the radial direction of the shaft core (12); a third boss is provided on the inner wall surface of the second through hole (3112) along the radial direction of the shaft core (12); the elastic connecting component (312) comprises: a first bolt (3121), the first bolt (3121) comprising a rod and a head located at one end of the rod, the side of the rod away from the head passing through the second through hole (3112) to be connected to the mounting housing (11), and an installation gap is provided between the third boss and the head along the axial direction of the shaft core (12); A compression spring (3122), wherein the compression spring (3122) is sleeved on the rod portion and located in the installation gap.

8. The hydrostatic spindle device according to claim 4, characterized in that: The second fastening assembly (32) comprises: A first mounting block (321), the first mounting block (321) being fixedly connected to the outer peripheral surface of the shaft core (12) and being located at one end of the mounting housing (11) close to the cylinder body (231); a second mounting block (322), which is mounted on an end of the first mounting block (321) away from the mounting housing (11) along the axial direction of the shaft core (12); and which is at least partially protruding from the outer peripheral surface of the first mounting block (321) along the radial direction of the shaft core (12) to form the first boss (331); a first locking member (323), wherein the first locking member (323) detachably connects the second mounting block (322) to the first mounting block (321); And / or, the liquid hydrostatic spindle device further comprises: A sealing member (40) is sleeved on the outer peripheral surface of the shaft core (12) and is located at one end of the mounting shell (11) close to the buckle mechanism (30), and the sealing member (40) is used to seal the mounting gap between the shaft core (12) and the end of the mounting shell (11) close to the buckle mechanism (30).

9. The hydrostatic spindle device according to any one of claims 2 to 8, characterized in that: A limiting hole (123) communicating with the second mounting hole (122) is provided in the shaft core (12) along the radial direction of the shaft core (12); the limiting hole (123) extends along the axial direction of the shaft core (12); and the limiting hole (123) is located on a side of the shaft core (12) away from the tool (50) and outside the first mounting hole (101); and the crimping component (24) comprises: A pressing block (241), wherein a third through hole (411) is provided in the pressing block (241), and the pressing block (241) is sleeved on the shaft core (12) through the third through hole (411) and can move relative to the shaft core (12) under the drive of the piston (232); A pressure rod (242), one end of the pressure rod (242) is connected to the pressure block (241), and the other end is passed through the second mounting hole (122) along the limiting hole (123) to be connected to the pull rod component (21), and the cross-sectional area of ​​the pressure rod (242) is smaller than the minimum size of the limiting hole (123).

10. The hydrostatic spindle device according to any one of claims 2 to 8, characterized in that: The pull rod component (21) comprises: A pull rod body (211), the pull rod body (211) being located in the second mounting hole (122), and opposite ends of the pull rod body (211) being respectively connected to the crimping component (24) and the claw component (22); An elastic member (212), wherein the elastic member (212) is telescopically sleeved on the pull rod body (211), and along the axial direction of the shaft core (12), the opposite ends of the elastic member (212) are respectively in contact with the inner wall surface of the second mounting hole (122) and the pull rod body (211), and the elastic member (212) can be reciprocatedly switched between a compressed state and an extended state under the action of its own elastic force; During the process of the elastic member (212) switching from the compressed state to the extended state, the pull rod body (211) is pulled to move in a direction away from the tool (50) until the claw component (22) is in a grasping state. When the pull rod body (211) moves in a direction close to the tool (50) so that the claw component (22) is in a released state, the elastic member (212) switches from the extended state to the compressed state.

11. The hydrostatic spindle device according to any one of claims 2 to 8, characterized in that: Along the axial direction of the shaft core (12), a mounting portion (51) is provided on one side of the tool (50) close to the shaft core (12), a first groove (511) is provided in the mounting portion (51), and the claw component (22) comprises: a connecting column (221), the connecting column (221) comprising a first section (2211) and a second section (2212), wherein along the radial direction of the shaft core (12), the maximum width of the first section (2211) is smaller than the maximum width of the second section (2212); A pulling claw (222), the pulling claw (222) being connected to the inner wall surface of the first mounting hole (101), an avoidance hole (2222) being arranged in the pulling claw (222), one end of the pulling rod component (21) away from the hydraulic cylinder (23) passing through the avoidance hole (2222) and connected to the first section (2211), the connecting column (221) being movable relative to the pulling claw (222) under the drive of the pulling rod component (21), and the pulling claw (222) comprising a plurality of grabbing pieces (2221) arranged at intervals along the circumference of the shaft core (12); Along the radial direction of the shaft core (12), the second section (2212) stretches the multiple grabbing pieces (2221) in a direction away from each other so as to press the multiple grabbing pieces (2221) between the inner wall surface of the first groove (511) and the outer peripheral surface of the second section (2212). Along the axial direction of the shaft core (12), the pull rod component (21) moves toward the direction approaching the tool (50) until the grabbing piece (2221) is arranged opposite to the first section (2211). Along the radial direction of the shaft core (12), the multiple grabbing pieces (2221) approach each other so as to be separated from the inner wall surface of the first groove (511).

12. A machine tool, characterized in that: The machine tool comprises: A hydrostatic spindle device as claimed in any one of claims 1 to 11.

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