Hydrostatic spindle device and machine tool

Abstract

The application discloses a hydrostatic spindle device and a machine tool. The hydrostatic spindle device comprises a spindle body, a tool changing mechanism and an anti-buckling mechanism. The shaft core of the spindle body is installed in the first mounting hole of the mounting shell and can rotate around its own axis. The first static pressure cavity is formed between the bottom side of the flange on the shaft core and the inner wall surface of the first mounting hole. The grabbing assembly of the tool changing mechanism comprises a pull rod part and a pull claw part. The driving assembly of the tool changing mechanism is installed at one end of the mounting shell. The pull rod part is installed in the second mounting hole of the shaft core and is connected with the driving assembly. The pull claw part is connected with the pull rod part. The pull rod part drives the pull claw part to switch between the grabbing state and the loosening state under the driving of the driving assembly. The anti-buckling mechanism is used for applying a force away from the first static pressure cavity to the shaft core. The application solves the problem that the tool changing time is relatively long and the machining efficiency of the machine tool adopting the hydrostatic spindle is relatively low.

Description

TECHNICAL FIELD

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

[0002] As a core component of an ultra-precision machine tool, the precision and rigidity of a hydrostatic spindle greatly affect the machining precision of a part. The hydrostatic spindle uses a hydrostatic bearing as a supporting element. The hydrostatic bearing relies on an external hydraulic oil supply system to forcibly inject lubricating oil to generate a pressure oil film, which separates the moving parts and the support in relative motion, thereby realizing full liquid friction. It can be seen that the hydrostatic spindle has the advantages of small frictional resistance, high transmission efficiency, long service life, wide speed range, good anti-vibration performance, high spindle rotation precision, and good adaptability, and is widely used in the field of ultra-precision machine tool machining.

[0003] A machining tool for machining a workpiece is arranged on the hydrostatic spindle, but the replacement operation of the tool is cumbersome and inconvenient, resulting in a long replacement time of the tool, which reduces the machining efficiency of the machine tool using the hydrostatic spindle. SUMMARY

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

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

[0006] A spindle body, the spindle body comprising a mounting shell and a shaft core, the mounting shell being provided with a first mounting hole inside, the shaft core being installed in the first mounting hole and being rotatable about its own axis, a flange being provided on the outer circumferential surface of one side of the shaft core in the axial direction of the shaft core, a first static pressure cavity being formed between the bottom side of the flange and the inner wall surface of the first mounting hole in the axial direction of the shaft core, and a second mounting hole being provided in the shaft core in the axial direction of the shaft core;

[0007] A tool changing mechanism, the tool changing mechanism comprising a driving assembly and a grabbing assembly, the grabbing assembly comprising a pull rod component and a pull claw component, the driving assembly being installed at one end of the mounting shell in the axial direction of the shaft core, the pull rod component being installed in the second mounting hole and being connected with the driving assembly, the pull claw component being installed at the end of the shaft core away from the driving assembly and being connected with the pull rod component, the pull claw component having a grabbing state of grabbing a tool to fix the tool with the shaft core and a loosening state of loosening the tool to separate the tool from the shaft core, and the pull rod component drivingly switching the pull claw component between the grabbing state and the loosening state under the driving of the driving assembly.

[0008] a counter buckling mechanism, which is installed between the driving assembly and the mounting shell and connected with the shaft core, and is used to apply an action force to the shaft core in the axial direction of the shaft core, away from the first static pressure cavity.

[0009] Further, the driving assembly comprises:

[0010] a hydraulic cylinder, which comprises a cylinder body and a piston, the piston is arranged in the cylinder body and can move relative to the cylinder body in the axial direction of the shaft core, the third mounting hole is arranged in the piston, the shaft core is sleeved in the third mounting hole on the side outside the first mounting hole, and the counter buckling mechanism is installed between the cylinder body and the mounting shell and connected with the shaft core;

[0011] a pressure connecting component, which 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, and can drive the pull rod component to move relative to the shaft core in the axial direction of the shaft core under the driving of the piston.

[0012] Further, the counter buckling mechanism comprises:

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

[0014] a second buckling assembly, which is connected with the shaft core and located between the outer circumferential surface of the shaft core and the first buckling assembly, and the abutting structure is arranged between the second buckling assembly and the first buckling assembly;

[0015] In the process of switching the pull claw component from the grabbing state to the loosening state, the second buckling assembly has a first state of moving relative to the mounting shell along the axial direction of the shaft core and a second state of being stationary relative to the mounting shell, and the abutting structure is used to abut the second buckling assembly with the first buckling assembly to limit the second buckling assembly to the second state.

[0016] Further, the abutting structure comprises:

[0017] a first boss, which is arranged on the side of the first buckling assembly close to the second buckling assembly in the radial direction of the shaft core;

[0018] A second boss is arranged on a side of the second fastening assembly close to the first fastening assembly in the radial direction of the shaft core, and is located on a side of the first boss away from the mounting shell in the axial direction of the shaft core.

[0019] Further, the first boss and the second boss have a first spacing in the axial direction of the shaft core.

[0020] The first spacing has a greater value when the second fastening assembly is in the first state than when the second fastening assembly is in the second state; and / or,

[0021] The first spacing has a value of not less than 0.3 mm when the second fastening assembly is in the second state.

[0022] Further, the first fastening assembly comprises:

[0023] A mounting seat is provided with a first through hole, the shaft core passes through the first through hole and is arranged in the third mounting hole, the second fastening assembly is located between the outer circumferential surface of the shaft core and the inner wall surface of the first through hole, the abutting structure is arranged between the inner wall surface of the first through hole and the second fastening assembly, and the end of the mounting seat close to the cylinder is fixedly connected with the cylinder in the axial direction of the shaft core.

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

[0025] Further, a second through hole is also arranged in the mounting seat in the axial direction of the shaft core, the second through hole is located on a side of the first through hole in the radial direction of the shaft core, and the inner wall surface of the second through hole is provided with a third boss in the radial direction of the shaft core.

[0026] A first bolt comprises a rod portion and a head portion located at one end of the rod portion, the rod portion away from the head portion side passes through the second through hole and is connected with the mounting shell, and the third boss and the head portion have a mounting gap in the axial direction of the shaft core.

[0027] A compression spring is arranged in the mounting gap and around the rod portion.

[0028] Further, the second fastening assembly comprises:

[0029] A first mounting block is fixedly connected with the outer circumferential surface of the shaft core and is located at the end of the mounting shell close to the cylinder.

[0030] The second mounting block, along the axial direction of the shaft core, is mounted on the 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 detachably connects the second mounting block to the first mounting block;

[0032] And / or, the hydrostatic spindle assembly further includes:

[0033] A sealing element is sleeved on the outer peripheral surface of the shaft core and located at one end of the mounting housing near the buckling mechanism. The sealing element is used to seal the installation gap between the shaft core and the end of the mounting housing near the buckling 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 axially along the shaft core and is located on the side of the shaft core away from the tool and outside the first mounting hole. The crimping component includes:

[0035] A pressure block, wherein a third through hole is provided in the pressure block, and the pressure block is sleeved on the shaft through the third through hole and can move relative to the shaft 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 passes through the limiting hole into the second mounting hole and is 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 includes:

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

[0039] An elastic element is telescopically sleeved on the pull rod body. Along the axial direction of the shaft core, the opposite ends of the elastic element abut against the inner wall surface of the second mounting hole and the pull rod body, respectively. The elastic element can switch back and forth between a compressed state and a stretched state under its own elastic force.

[0040] During the process that the elastic member switches from the compressed state to the stretched state, the pull rod body is pulled to move away from the cutter until the pull claw component is in the grabbing state; when the pull rod body moves towards the cutter to make the pull claw component in the releasing state, the elastic member switches from the stretched state to the compressed state.

[0041] Further, along the axial direction of the shaft core, the cutter is provided with a mounting portion on the side close to the shaft core, and the mounting portion is provided with a first groove; the pull claw component comprises:

[0042] The connecting column comprises a first segment and a second segment, and along the radial direction of the shaft core, the maximum width of the first segment is smaller than that of the second segment;

[0043] The pull claw is connected with the inner wall surface of the first mounting hole, and the pull claw is provided with a avoiding hole; the end of the pull rod component away from the hydraulic cylinder passes through the avoiding hole and is connected with the first segment; the connecting column can move relative to the pull claw under the driving of the pull rod component; along the circumferential direction of the shaft core, the pull claw comprises a plurality of spaced grabbing pieces;

[0044] Along the radial direction of the shaft core, the second segment supports the plurality of grabbing pieces away from each other to tightly abut the plurality of grabbing pieces between the inner wall surface of the first groove and the outer circumferential surface of the second segment; along the axial direction of the shaft core, when the pull rod component moves towards the cutter to make the grabbing pieces oppositely arranged with the first segment, along the radial direction of the shaft core, the plurality of grabbing pieces are close to each other to separate from the inner wall surface of the first groove.

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

[0046] The liquid static pressure spindle device.

[0047] In the application, the liquid static pressure spindle device comprises a spindle body, a tool changing mechanism and an anti-lock mechanism. A first mounting hole is arranged in the mounting shell of the spindle body, and the shaft core of the spindle body is mounted in the first mounting hole and can rotate around its own axis. A flange is arranged on the outer circumferential surface of the shaft core along one side of the shaft core in the 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 in the axial direction of the shaft core. The first static pressure cavity is filled with oil during the rotation of the shaft core, so as to reduce the frictional resistance between the shaft core and the inner wall surface of the first mounting hole. The grabbing assembly of the tool changing mechanism comprises a pull rod component and a pull claw component. The pull rod component is mounted in the second mounting hole of the shaft core and is connected with the driving assembly. The pull claw component is mounted at the end of the shaft core away from the driving assembly and is connected with the pull rod component. The pull rod component can drive the pull claw component to switch between the grabbing state and the loosening state under the driving of the driving assembly, so as to more conveniently realize the replacement of the tool. The operator only needs to take down the tool when the pull claw component loosens the tool, thereby simplifying the operation of replacing the tool, reducing the replacement time of the tool, and improving the machining efficiency of the machine tool using the liquid static pressure spindle device.

[0048] At the same time, during the process that the pull rod component drives the pull claw component to switch from the grabbing state to the loosening state, a downward pressure is easily applied to the shaft core, so that the shaft core has a movement trend of driving the flange to abut against the static pressure cavity surface of the first static pressure cavity in the axial direction of the shaft core under the action of the downward pressure, which easily causes the direct collision between the flange and the static pressure cavity surface. In this regard, the anti-lock mechanism is also arranged. The anti-lock mechanism is mounted between the driving assembly and the mounting shell and is connected with the shaft core. In the axial direction of the shaft core, the anti-lock mechanism is used to apply an action force to the shaft core away from the first static pressure cavity. Under the action of the action force, the direct collision between the flange of the shaft core and the static pressure wall surface can be avoided, so as to protect the static pressure cavity surface from being scratched or worn, ensure that the frictional resistance between the shaft core and the inner wall surface of the first mounting hole will not increase, and improve the rotation accuracy and service life of the shaft core after the tool changing mechanism is arranged. BRIEF DESCRIPTION OF DRAWINGS

[0049] The drawings described herein are used to provide further understanding of the application, constitute a part of the application, and are used to explain the application and do not constitute improper limitations on the application. In the drawings:

[0050] Figure 1 The structural schematic diagram of the liquid static pressure spindle device provided by an embodiment of the application;

[0051] Figure 2 The front view of the liquid static pressure spindle device;

[0052] Figure 3 The A-A sectional view of Figure 2

[0053] Figure 4 The A-A sectional view of​Figure 3 Enlarged view of part B;

[0054] Figure 5 is Figure 3 Enlarged view of part C;

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

[0056] Figure 7 is Figure 6 D-D sectional view of the reverse buckle mechanism;

[0057] Figure 8 is Figure 1 Explanatory view of the reverse buckle mechanism;

[0058] Figure 9 is a structural view of the claw component.

[0059] In the above drawings, the following reference signs are used:

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

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

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

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

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

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

[0066] 30, reverse buckle mechanism; 31, first buckling 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, abutting structure; 331, first boss; 332, second boss;

[0070] 40, sealing member;

[0071] 50, tool; 51, mounting portion; 511, first groove; 512, protrusion. DETAILED DESCRIPTION

[0072] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

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

[0074] The relative arrangement, numerical expressions and values of the components and steps set forth in the embodiments are not intended to limit the scope of the present application, unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. Techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0075] The existing hydrostatic spindle usually needs tedious disassembly and connection operations by the operator to realize the replacement of the tool 50, which is inconvenient and time-consuming, resulting in a long replacement time of the tool 50 and a low processing efficiency of the machine tool using the hydrostatic spindle. In view of this, the first embodiment of the present application provides a hydrostatic spindle device, please see Figures 1 to 9 The liquid pressure reducing spindle device includes a spindle body 10, a tool changing mechanism 20 and a reverse buckling mechanism 30.

[0076] As Figures 1 to 3As shown, the spindle body 10 includes a mounting housing 11 and a spindle core 12. A first mounting hole 101 is provided within the mounting housing 11, and the spindle core 12 is mounted within the first mounting hole 101 and can rotate about its own axis. A flange 121 is provided on the outer circumferential surface of the spindle core 12 along its axial direction. A first hydrostatic cavity 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 spindle core 12. After oil is introduced into the first hydrostatic cavity 102, an oil film can be formed between the spindle core 12 and the inner wall surface of the first mounting hole 101, reducing the frictional resistance during the operation of the spindle core 12. A second mounting hole 122 is provided within the spindle core 12 along its axial direction.

[0077] like Figures 3 to 5 As shown, the tool changing mechanism 20 includes a drive assembly and a gripping assembly. The gripping assembly includes a pull rod component 21 and a claw component 22. Along the axial direction of the shaft core 12, the drive assembly is installed at one end of the mounting housing 11. The pull rod component 21 is installed in the second mounting hole 122 and connected to the drive assembly. The claw component 22 is installed at the end of the shaft core 12 away from the drive assembly and connected to the pull rod component 21. The claw component 22 has a gripping state that grips the tool 50 to fix the tool 50 to the shaft core 12 and a releasing state that releases the tool 50 to separate the tool 50 from the shaft core 12. The pull rod component 21 drives the claw component 22 to switch between the gripping state and the releasing state under the drive of the drive assembly. Thus, the tool 50 can be replaced conveniently and quickly by starting the drive assembly. When the claw component 22 is in the releasing state, the operator only needs to remove the tool 50 and then use the claw component 22 to grip the new tool 50 to connect the tool 50 and the shaft core 12 together.

[0078] The inner wall surface of the first mounting hole 101 near the side of the tool 50 is provided with a first avoiding groove, the first avoiding groove is recessed in the direction away from the shaft core 12, and the flange 121 and the groove bottom of the first avoiding groove along the axial direction of the shaft core 12 form a first static pressure cavity 102. Specifically, the mounting shell 11 in the embodiment can include a main shell 111, a connecting block 112 and a sealing component 113. The first hole is arranged in the main shell 111, and the connecting block 112 is sealingly connected between the mounting shell and the sealing component 113. Along the axial direction of the shaft core 12, the second hole communicated with the first hole is arranged in the connecting block 112 and the sealing component 113, the first hole and the second hole form the first mounting hole 101, the second avoiding groove is arranged on the side of the first hole near the connecting block 112, the wall surface of the connecting block 112 protruding from the second avoiding groove away from the shaft core 12 and the second avoiding groove form the first avoiding groove, the flange 121 is located in the first avoiding groove, and along the axial direction of the shaft core 12, the surface of the connecting block 112 near the flange 121 is provided with an oil groove, the oil groove is arranged opposite to the flange 121, and then the first static pressure cavity 102 is a static pressure cavity formed by the flange 121 and the oil groove on the connecting block 112. Since the first static pressure cavity 102 in the embodiment plays an important role in the stable operation of the shaft core 12, in the process that the pull rod component 21 pushes the pull claw component 22 to loosen the tool 50, the downward pressure of the pull rod component 21 moving downward is large, this downward pressure has a tendency to drive the shaft core 12 to move along the axial direction of itself towards the tool 50, which is easy to cause the flange 121 and the static pressure cavity surface near the side of itself of the first static pressure cavity 102 to collide directly, causing the static pressure wall surface to be damaged, resulting in the increase of the frictional resistance between the shaft core 12 and the inner wall surface of the first mounting hole 101, and this static pressure cavity surface is the surface of the connecting block 112 near the side of the flange 121. To this end, while ensuring that the liquid static pressure spindle can realize the replacement of the tool 50, in order to avoid the damage of the surface of the first static pressure cavity 102, the embodiment further provides a reverse buckling mechanism 30, the reverse buckling mechanism 30 is installed between the driving assembly and the mounting shell 11 and connected with the shaft core 12, and along the axial direction of the shaft core 12, the reverse buckling mechanism 30 is used to apply a force to the shaft core 12 away from the first static pressure cavity 102. Thus, in the process that the pull rod component 21 pushes the pull claw component 22 to loosen the tool 50, the force applied by the reverse buckling mechanism 30 can overcome the downward pressure of the shaft core 12 being pressed downward, so as to ensure that the flange 121 on the shaft core 12 will not collide directly with the static pressure cavity surface, and avoid the damage of the static pressure cavity surface.

[0079] In addition, as shown in the drawings, Figure 5 the outer peripheral surface of the shaft core 12 and the inner peripheral surface of the first mounting hole 101 in the embodiment further form at least two second static pressure cavities 103, so as to further reduce the frictional resistance between the shaft core 12 and the mounting shell 11 through the second static pressure cavities 103, and improve the rotation precision and efficiency.

[0080] It can be seen that in the embodiment, the liquid static pressure spindle device comprises a spindle body 10, a tool changing mechanism 20 and an anti-lock mechanism 30. The spindle body 10 is provided with a first mounting hole 101 in the mounting shell 11. The shaft core 12 of the spindle body 10 is mounted in the first mounting hole 101 and can rotate around its own axis. The flange 121 is arranged on the outer circumferential surface of the shaft core 12 along one side of the shaft core 12 in the axial direction. Along the axial direction of the shaft core 12, the first static pressure cavity 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 cavity 102 is filled with oil during the rotation of the shaft core 12, so as to reduce the frictional 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 comprises a pull rod component 21 and a pull claw component 22. The pull rod component 21 is mounted in the second mounting hole 122 of the shaft core 12 and connected with the driving assembly. The pull claw component 22 is mounted at the end of the shaft core 12 away from the driving assembly and connected with the pull rod component 21. The pull rod component 21 can drive the pull claw component 22 to switch between the grabbing state and the loosening state under the driving of the driving assembly, 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 loosens 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 static pressure spindle device.

[0081] At the same time, during the process that the pull rod component 21 drives the pull claw component 22 to switch from the grabbing state to the loosening state, a downward pressure is easily applied to the shaft core 12, so that the shaft core 12 has a movement trend of driving the flange 121 to abut against the static pressure cavity surface of the first static pressure cavity 102 along the axial direction of the shaft core 12 under the action of the downward pressure, which easily causes the direct collision between the flange 121 and the static pressure cavity surface. In this regard, the anti-lock mechanism 30 is further arranged in the embodiment. The anti-lock mechanism 30 is mounted between the driving assembly and the mounting shell 11 and connected with the shaft core 12. Along the axial direction of the shaft core 12, the anti-lock mechanism 30 is used to apply a force to the shaft core 12 away from the first static pressure cavity 102. Under the action of the force, the direct collision between the flange 121 of the shaft core 12 and the static pressure wall surface can be avoided, so as to protect the static pressure cavity surface from being scratched or worn, ensure that the frictional resistance between the shaft core 12 and the inner wall surface of the first mounting hole 101 will not increase, and improve the rotation accuracy and service life of the shaft core 12 after the tool changing mechanism 20 is arranged.

[0082] In the embodiment, as Figure 8As shown, along the radial direction of the shaft core 12, a limiting hole 123 in communication with the second mounting hole 122 is arranged through the shaft core 12, 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, which limits the moving distance of the pull rod component 21 along the axial direction of the shaft core 12. 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 be connected with the driving assembly. The driving assembly in the embodiment includes a hydraulic cylinder 23 and a pressing 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. The cylinder body 231 is provided with a hydraulic cavity, which is connected with or discharged from hydraulic oil to drive the piston 232 to move relative to the cylinder body 231. The piston 232 is provided with a third mounting hole 2321, and the shaft core 12 on the side outside the first mounting hole 101 is sleeved in the third mounting hole 2321. The reverse buckling mechanism 30 is installed between the cylinder body 231 and the mounting shell 11 and is connected with the shaft core 12 on the side outside the first mounting hole 101, so that the reverse buckling mechanism 30 can exert a force on the shaft core 12. The assembled overall structure is compact and reliable.

[0083] In the embodiment, the pressing 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 with the pull rod component 21. Along the axial direction of the shaft core 12, the pressing component 24 can drive the pull rod component 21 to move relative to the shaft core 12 under the driving of the piston 232, so that the pull rod component 21 drives the pull claw component 22 to switch from the grabbing state to the loosening state. That is, the embodiment can drive the pressing component 24 to move along the inner wall surface of the limiting hole 123 relative to the shaft core 12 by the piston 232, and then drive the pull rod component 21 connected with the pressing component 24 to press downward along the axial direction of the shaft core 12 to switch the pull claw component 22 from the grabbing state to the loosening state. The driving process is stable and reliable, and the overall structure is simple, compact and easy to assemble.

[0084] The embodiment can directly ensure that the piston 232 can push the crimping part 24 by connecting the crimping part 24 with the inner wall surface of the third mounting hole 2321, but in order to further improve the structural strength of the hydraulic cylinder 23 and the assembly convenience of the crimping part 24, the fourth boss 3211 is arranged in the third mounting hole 2321 in the embodiment. The crimping part 24 comprises a pressing block 241 and a pressing rod 242. The pressing block 241 is arranged with a third through hole 411, 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 driving of the piston 232. In 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 shell 11, and at least part of the pressing block 241 along the radial direction of the shaft core 12 is arranged opposite to the fourth boss 3211, so that the pressing block 241 can be pushed to move by the fourth boss 3211 when the piston 232 is pressed down. The pressing rod 242 is connected with the pressing block 241 at one end and is connected with the pull rod part 21 through the second mounting hole 122 along the limiting hole 123 at the other end, and the cross-sectional area of the pressing rod 242 is smaller than the minimum size of the limiting hole 123. Therefore, the pressing block 241 and the pull rod part 21 are connected, and the pressing rod 242 can drive the pull rod part 21 to move a predetermined distance. The crimping structure composed of the pressing block 241 and the pressing rod 242 in the embodiment not only has assembly convenience, but also avoids opening corresponding hole positions in the hydraulic cylinder 23 to connect the crimping part 24, thereby ensuring the structural strength of the hydraulic cylinder 23.

[0085] Please refer to Figures 3 to 7 The reverse buckling mechanism 30 in the embodiment comprises a first buckling assembly 31 and a second buckling assembly 32. The first buckling assembly 31 is located between the cylinder body 231 and the mounting shell 11 and is connected with the cylinder body 231. In the axial direction of the shaft core 12, the first buckling assembly 31 can reciprocate relative to the mounting shell 11 along with the cylinder body 231. The second buckling assembly 32 is connected with the shaft core 12 and is located between the outer peripheral surface of the shaft core 12 and the first buckling assembly 31. The second buckling assembly 32 and the first buckling assembly 31 are provided with an abutting structure 33 therebetween.

[0086] In the process of switching the pull claw part 22 from the grabbing state to the loosening state, in the axial direction of the shaft core 12, the second buckling assembly 32 has a first state of moving relative to the mounting shell 11 along with the shaft core 12 and a second state of being stationary relative to the mounting shell 11. The abutting structure 33 is used for abutting the second buckling assembly 32 with the first buckling assembly 31 to limit the second buckling assembly 32 to the second state. Therefore, when the shaft core 12 has a tendency to move in the direction of the cutter 50, the second buckling assembly 32 is limited to the second state by the abutting structure 33, an acting force away from the first static pressure cavity 102 is applied to the shaft core 12, the shaft core 12 is prevented from continuing to move downward to collide and damage the static pressure cavity surface of the first static pressure cavity 102, and the stable operation of the shaft core 12 is ensured.

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

[0088] Among them, such as 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 disposed on the side of the first fastening assembly 31 near the second fastening assembly 32. Along the radial direction of the shaft core 12, the second boss 332 is disposed on the side of the second fastening assembly 32 near the first fastening 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 housing 11. Therefore, by having the first boss 331 and the second boss 332 abut against each other on their respective sides, this embodiment ensures that during the release operation of the claw component 22, the second fastening assembly 32 can be restricted to a second state, thereby ensuring that the shaft core 12 will not cause the flange 121 to impact the hydrostatic chamber surface under the thrust of the piston 232 of the hydraulic cylinder 23, thus improving the protection performance of the first hydrostatic chamber 102.

[0089] Along the axial direction of the shaft core 12, there is a first gap between the first boss 331 and the second boss 332. The value of the first gap when the second fastening assembly 32 is in the first state is larger than the value when the second fastening assembly 32 is in the second state. That is to say, when the second fastening 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 smaller first gap). Thus, while protecting the hydrostatic cavity surface, it also ensures that the shaft core 12 will not be affected by the first boss 331 and the second boss 332 abutting too tightly, thereby further improving the stability and reliability of the shaft core 12 during operation.

[0090] In some embodiments, when the second fastening assembly 32 is in the second state, the value of the first gap is not less than 0.3 mm (mm is a unit of measurement). Specifically, the value of the first gap 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, or 0.4 mm. Thus, when the second fastening assembly 32 is in the second state, by ensuring that the value of the first gap is not less than 0.3 mm, the rotational accuracy and stability of the shaft core 12 are ensured.

[0091] like Figure 7 and Figure 8 As shown, the first fastening assembly 31 in this embodiment includes a mounting base 311 and an elastic connecting member 312. A first through hole 3111 is provided in the mounting base 311, through which the shaft core 12 passes and is fitted into the third mounting hole 2321. The second fastening 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. An abutment structure 33 is disposed between the inner wall surface of the first through hole 3111 and the second fastening assembly 32. Specifically, the first boss 331 of the abutment structure 33 protrudes from the inner wall surface of the first through hole 3111. Along the axial direction of the shaft core 12, the end of the mounting base 311 near the cylinder body 231 is fixedly connected to the cylinder body 231. The elastic connecting member 312 connects the mounting base 311 and the mounting housing 11. Along the axial direction of the shaft core 12, the mounting base 311 can move with the cylinder body 231 under the elastic deformation of the elastic connecting member 312 to move closer to or further away from the mounting housing 11.

[0092] Thus, the present embodiment connects the mounting seat 311 with the mounting shell 11 through the elastic connecting component 312, in the process of driving the puller component 22 to loosen the tool 50 by the hydraulic cylinder 23, the piston 232 pushes the compression component 24 to drive the pull rod component 21 to be pressed down. Since the pressing force is very large, in order not to damage the static pressure oil cavity surface, in the process of pressing down, the piston 232 generates a pressing force on the shaft core 12 and the second buckling assembly 32 connected with the shaft core 12. At this time, since the mounting seat 311 of the reverse buckling mechanism 30 can exert an opposite force on the second buckling assembly 32 through the abutting structure 33, the piston 232 and the cylinder body 231 have a tendency to be pushed upward in a direction away from the tool 50. Based on the fact that the mounting seat 311 is elastically connected with the mounting shell 11 through the elastic connecting component 312, when the piston 232 is pressed down, the cylinder body 231 can drive the mounting seat 311 to be slightly pushed upward in a direction away from the tool 50 under the action of the opposite force exerted by the piston 232, the cylinder body 231 and the mounting seat 311 are pushed upward until the abutting structure 33 limits the second buckling assembly 32 to the second state, which not only makes the pushing force generated by the piston 232 of the hydraulic cylinder 23 not directly act on the static pressure cavity surface, but also protects the static pressure cavity surface, and improves the blocking efficiency of the shaft core 12 being prevented from continuing to be pressed down. Moreover, since the mounting seat 311 can be slightly pushed upward with the cylinder body 231, the corresponding pushing force will not directly act on the end surface of the mounting shell 11, which also improves the structural stability of the mounting shell 11.

[0093] The mounting seat 311 can be connected with the cylinder body 231 through a screw. 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, and along the radial direction of the shaft core 12, the inner wall surface of the second through hole 3112 is provided with a third boss 1121. The elastic connecting component 312 includes a first bolt 3121 and a compression spring 3122. The first bolt 3121 includes a rod portion and a head portion located at one end of the rod portion, the side of the rod portion away from the head portion is connected with the mounting shell 11 through the second through hole 3112, and the rod portion is in clearance fit with the second through hole 3112. Along the axial direction of the shaft core 12, the third boss 1121 has a mounting gap with the head portion, and the compression spring 3122 is sleeved on the rod portion and located in the mounting 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 shell 11, when the mounting seat 311 is moved upward along the axial direction of the shaft core 12 with the cylinder body 231, the compression spring 3122 is compressed, and the activity freedom of the mounting seat 311 is ensured. At the same time, the present embodiment realizes the activity connection of the mounting seat 311 with the mounting shell 11 by installing the first bolt 3121 and the compression spring 3122 in the second through hole 3112 of the mounting seat 311, which not only is convenient to assemble and has low difficulty, but also makes the overall structure of the reverse buckling mechanism 30 more compact and reliable.

[0094] AsFigure 7 As shown, the second buckling assembly 32 in the 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 with the outer circumferential surface of the shaft core 12 and located at the end of the mounting shell 11 close to the cylinder body 231. In the axial direction of the shaft core 12, the second mounting block 322 is arranged on the end of the first mounting block 321 away from the mounting shell 11, and in the radial direction of the shaft core 12, the second mounting block 322 at least partially protrudes from the outer circumferential surface of the first mounting block 321 to form a first boss 331. When the first mounting block 321 and the second mounting block 322 are both circular mounting blocks, the first mounting block 321 and the second mounting block 322 are arranged coaxially with the shaft core 12, and the diameter of the second mounting block 322 is greater than that of the first mounting block 321, so that the part of the second mounting block 322 protruding from the first mounting block 321 forms a corresponding first boss 331. At this time, the first boss 331 is also a circular ring structure extending in the circumferential direction of the shaft core 12, which can improve the reliability when abutting against the second boss 332. Moreover, when the first mounting block 321 and the second mounting block 322 of the circular mounting block structure are arranged in corresponding hole 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 with the first mounting block 321. The first locking member 323 in the embodiment can be a locking structure such as a screw or a bolt.

[0095] As shown in Figure 3 and Figure 8 In the embodiment, the hydrostatic spindle device further includes a sealing member 40, which is sleeved on the outer circumferential surface of the shaft core 12 and located at the end of the mounting shell 11 close to the reverse buckling mechanism 30. The sealing member 40 is used to seal the installation gap between the shaft core 12 and the end of the mounting shell 11 close to the reverse buckling mechanism 30. Thus, when the mounting seat 311 of the reverse buckling mechanism 30 is driven upward by the cylinder body 231 and has a gap between the end of the mounting shell 11, the sealing member 40 can prevent external dust and liquid from entering the inside of the mounting shell 11 through the corresponding gap to pollute and block the internal devices. The sealing member 40 in the embodiment can be a flexible dustproof ring, which is easy to assemble and has good waterproof and dustproof effect.

[0096] In the embodiment, as shown in Figures 3 to 5As shown, the pull rod component 21 comprises a pull rod body 211 and an elastic member 212. The pull rod body 211 is located in the second mounting hole 122, and opposite ends of the pull rod body 211 are connected with the crimping component 24 and the pull claw component 22 respectively. The elastic member 212 is telescopically sleeved on the pull rod body 211, and opposite ends of the elastic member 212 are respectively in abutment with the inner wall surface of the second mounting hole 122 and the pull rod body 211 along the axial direction of the shaft core 12. The elastic member 212 can reciprocate between the compressed state and the stretched state under the action of its own elastic force. In the process of switching the elastic member 212 from the compressed state to the stretched state, the pull rod body 211 is pulled to move away from the cutter 50 until the pull claw component 22 is in the grabbing state. When the pull rod body 211 moves towards the cutter 50 to make the pull claw component 22 in the loosening state, the elastic member 212 switches from the stretched state to the compressed state. Thus, the embodiment can reset the pull rod body 211 through the elastic member 212. When the cutter 50 is aligned with the pull claw component 22 to ensure that the pull claw component 22 can grab the cutter 50 to be connected with the shaft core 12, the pull rod body 211 does not need to be moved again by the driving assembly driven by the driving assembly to abut against the position where the pull claw component 22 grabs the cutter 50.

[0097] Specifically, as shown, Figures 3 to 5 The elastic member 212 in the embodiment can be a disc spring elastic structure, which comprises 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 first abutment blocks 213 on opposite sides of the disc spring elastic structure. The inner wall surface of the second mounting hole 122 further protrudes an abutment table 124, which is in abutment with the abutment block on the side of the disc spring elastic structure close to the cutter 50. The side of the pull rod body 211 close to the crimping component 24 is further sleeved with a second abutment block 215, which is fixedly connected with the pull rod body 211. The first abutment block 213 on the side of the disc spring elastic structure away from the abutment table 124 is located between the disc spring elastic structure and the second abutment block 215. When the pull rod body 211 moves towards the cutter 50, the second abutment block 215 is in abutment with the first abutment block 213 and compresses the disc spring elastic structure under the action of the thrust force. When it is necessary to grab the cutter 50 to be replaced, the disc spring elastic structure gradually stretches from the compressed state until the first abutment block 213 on the side close to the abutment table 124 is in abutment with the abutment table 124, and the pressing block 241 of the crimping component 24 is in abutment with the fourth boss 3211.

[0098] In the process of compression of the elastic member 212 in the embodiment, the elastic member 212 also applies pressure to the shaft core 12, such as when the first abutting block 213 abuts against the abutting table 124, the first abutting block 213 presses down the abutting table 124, so that the shaft core 12 has a tendency to drive the flange 121 to move close to the first static pressure cavity 102 under the pressure generated by the compression of the elastic member 212. The embodiment is just to set the reverse buckle mechanism 30 to offset the shaft core 12 from driving the flange 121 to collide with the static pressure cavity surface of the first static pressure cavity 102, so as to ensure that the static pressure cavity surface is not damaged by collision.

[0099] As shown in Figure 3 and Figure 8 , the pull rod component 21 in the embodiment also includes a nut column 214, along the radial direction of the shaft core 12, a hole position communicated with the limiting hole 123 can be provided through the nut column 214, so that the pressing rod 242 can be sleeved in the hole position, and the pressing rod 242 and the pull rod body 211 are fixedly connected together through the second locking member (such as a bolt), which is convenient for assembly.

[0100] Along the axial direction of the shaft core 12, the cutter 50 is provided with a mounting portion 51 on the side close to the shaft core 12, and the mounting portion 51 is provided with a first groove 511. The pull claw component 22 includes a connecting column 221 and a pull 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 that of the second section 2212, such as when the connecting column 221 is a cylindrical structure, the diameter of the first section 2211 is smaller than that of the second section 2212, so that the second section 2212 forms a boss structure.

[0101] As shown in Figure 3 and Figure 9 , the pull claw 222 is connected with the inner wall surface of the first mounting hole 101, the pull claw 222 is provided with a avoiding hole 2222, and the end of the pull rod body 211 of the pull rod component 21 away from the hydraulic cylinder 23 penetrates through the avoiding hole 2222 and is connected with the first section 2211, so that the connecting column 221 can move relative to the pull claw 222 under the driving of the pull rod body 211. Figure 9As shown, the claw 222 includes a plurality of spaced-apart tabs 2221 along the circumferential direction of the shaft core 12. The tabs 2221 are elastically deformable so that the plurality of tabs 2221 can be close to or away from each other. When the claw component 22 is in the gripping state, the second section 2212 pushes the plurality of tabs 2221 away from each other along the radial direction of the shaft core 12 to abut between the inner wall surface of the first groove 511 and the outer circumferential surface of the second section 2212. When the pull rod body 211 moves towards the cutter 50 along the axial direction of the shaft core 12 to the position where the tabs 2221 are opposite to the first section 2211, the plurality of tabs 2221 are close to each other along the radial direction of the shaft core 12 to separate from the inner wall surface of the first groove 511, thereby achieving the cutter releasing operation. That is, when the second section 2212 is at least partially opposite to the tabs 2221, the plurality of tabs 2221 are pushed away from each other along the radial direction of the second section 2212 to abut between the inner wall surface of the first groove 511 and the outer circumferential surface of the second section 2212, i.e. the plurality of tabs 2221 are supported by the second section 2212 to achieve the gripping of the cutter 50. When the pull rod body 211 moves towards the cutter 50 along the axial direction of the shaft core 12 to the position where the tabs 2221 are opposite to the first section 2211, the plurality of tabs 2221 are close 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 releasing of the cutter 50. The tabs 2221 are provided with buckling protrusions outside the top of the hydraulic cylinder 23, and the inner circumferential wall of the first groove 511 is provided with buckling grooves. When the tabs 2221 are supported by the second section 2212, the buckling protrusions are buckled and abut in the buckling grooves to achieve the gripping of the cutter 50.

[0102] As Figure 5As shown, the shaft core 12 is provided with a second groove 125 away from the bottom end of the hydraulic cylinder 23, and the second groove 125 is communicated with the first mounting hole 101. The second groove 125 is matched with the mounting part 51 of the cutter 50, the mounting part 51 of the cutter 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 clamping pieces 2221, the cutter 50 is firmly clamped, and the second groove 125 can improve the connection strength between the cutter 50 and the shaft core 12. When the pull rod body 211 pushes the connecting column 221 to move away from the hydraulic cylinder 23 until the first section 2211 is oppositely arranged with the clamping pieces 2221 to fold the clamping pieces 2221, the clamping pieces 2221 and the outer peripheral wall of the first groove 511 are separated, and the cutter 50 is released. The outer peripheral surface of the mounting part 51 is further 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 make the cutter 50 be taken off more labor-saving, a ventilation channel can be arranged in the outer peripheral wall of the shaft core 12, one end of the ventilation channel can be communicated with a blowing device through a corresponding pipeline, and the other end extends to the bottom end of the shaft core 12 and is oppositely arranged with the protrusion 512. When the blowing device blows air into the ventilation channel, an external force can be applied to the protrusion 512, so that a loose gap is generated between the cutter 50 and the shaft core 12, and the cutter 50 is taken off more labor-saving.

[0103] The second embodiment of the present application also provides a machine tool, and the machine tool comprises the hydrostatic spindle device. The structure of the hydrostatic spindle device is specifically referable to the content provided in the first embodiment of the present application, and will not be described herein again. The machine tool in the embodiment can be a vertical grinding machine.

[0104] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", and the like can be used herein to describe the spatial relationship between one device or feature and another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0105] In addition, it should be noted that the use of the terms "first", "second", and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0106] The above merely provides preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall into the scope of protection of the present application.

Claims

1. A hydrostatic spindle apparatus, characterized by, The main shaft body (10) comprises a mounting shell (11) and a shaft core (12), the first mounting hole (101) is arranged in the mounting shell (11), the shaft core (12) is mounted in the first mounting hole (101) and can rotate around the axis thereof, the flange (121) is arranged on the outer circumferential surface of the shaft core (12) on one side in the axial direction of the shaft core (12), and the first static pressure cavity (102) is formed between the bottom side of the flange (121) and the inner wall surface of the first mounting hole (101) in the axial direction of the shaft core (12); the second mounting hole (122) is arranged in the shaft core (12) in the axial direction of the shaft core (12); The tool changing mechanism (20) comprises a driving assembly and a grabbing assembly, the grabbing assembly comprises a pull rod component (21) and a pull claw component (22), the driving assembly is mounted at one end of the mounting shell (11) in the axial direction of the shaft core (12), the pull rod component (21) is mounted in the second mounting hole (122) and connected with the driving assembly, the pull claw component (22) is mounted at the end of the shaft core (12) away from the driving assembly and connected with the pull rod component (21), the pull claw component (22) has a grabbing state of grabbing the tool (50) to fix the tool (50) with the shaft core (12) and a loosening state of loosening the tool (50) to separate the tool (50) from the shaft core (12), and the pull rod component (21) drives the pull claw component (22) to switch between the grabbing state and the loosening state under the driving of the driving assembly; The reverse buckling mechanism (30) is mounted between the driving assembly and the mounting shell (11) and connected with the shaft core (12), and is used for applying a force away from the first static pressure cavity (102) to the shaft core (12) in the axial direction of the shaft core (12); The driving assembly comprises a hydraulic cylinder (23), the hydraulic cylinder (23) comprises a cylinder body (231) and a piston (232), and the piston (232) is arranged in the cylinder body (231) and can move relative to the cylinder body (231) in the axial direction of the shaft core (12); The reverse buckling mechanism (30) comprises: The first buckling assembly (31) is located between the cylinder body (231) and the mounting shell (11) and connected with the cylinder body (231), and can reciprocate relative to the mounting shell (11) along with the cylinder body (231) in the axial direction of the shaft core (12); The second buckling assembly (32) is connected with the shaft core (12) and located between the outer circumferential surface of the shaft core (12) and the first buckling assembly (31), and the abutting structure (33) is arranged between the second buckling assembly (32) and the first buckling assembly (31). ​ In the process that the puller component (22) switches from the gripping state to the releasing state, the second fastening assembly (32) has a first state that moves with the shaft core (12) relative to the mounting shell (11) and a second state that is stationary relative to the mounting shell (11) in the axial direction of the shaft core (12), and the abutting structure (33) is used for abutting the second fastening assembly (32) with the first fastening assembly (31) to limit the second fastening assembly (32) to the second state.

2. The hydrostatic spindle apparatus of claim 1, wherein, The shaft core (12) is sleeved in the third mounting hole (2321) on the side of the first mounting hole (101) and the reverse fastening mechanism (30) is installed between the cylinder body (231) and the mounting shell (11) and connected with the shaft core (12); the driving assembly further comprises: A press-fit component (24) is located in the third mounting hole (2321) and at least partially penetrates into the second mounting hole (122) to connect with the pull rod component (21), and the press-fit component (24) can drive the pull rod component (21) to move relative to the shaft core (12) under the driving of the piston (232) in the axial direction of the shaft core (12).

3. The hydrostatic spindle apparatus of claim 2, wherein, The abutting structure (33) comprises: A first boss (331) is arranged on the side of the first fastening assembly (31) close to the second fastening assembly (32) in the radial direction of the shaft core (12); A second boss (332) is arranged on the side of the second fastening assembly (32) close to the first fastening assembly (31) in the radial direction of the shaft core (12), and the second boss (332) is located on the side of the first boss (331) away from the mounting shell (11) in the axial direction of the shaft core (12).

4. The hydrostatic spindle apparatus of claim 3, wherein, The first boss (331) and the second boss (332) have a first spacing in the axial direction of the shaft core (12); The first spacing has a larger value when the second fastening assembly (32) is in the first state than when the second fastening assembly (32) is in the second state; and / or The first spacing has a value not less than 0.3 mm when the second fastening assembly (32) is in the second state.

5. The hydrostatic spindle apparatus of claim 2, wherein, The first fastening assembly (31) comprises: The mounting seat (311) is provided with a first through hole (3111) therein, the shaft core (12) is sleeved in the third mounting hole (2321) through the first through hole (3111), the second buckle assembly (32) is located between the outer circumferential surface of the shaft core (12) and the inner wall surface of the first through hole (3111), the abutting structure (33) is arranged between the inner wall surface of the first through hole (3111) and the second buckle assembly (32), and the mounting seat (311) is fixedly connected with the cylinder body (231) at one end close to the cylinder body (231) along the axial direction of the shaft core (12); The elastic connecting component (312) is connected between the mounting seat (311) and the mounting shell (11), and the mounting seat (311) can be close to or away from the mounting shell (11) along the axial direction of the shaft core (12) under the elastic deformation of the elastic connecting component (312).

6. The hydrostatic spindle apparatus of claim 5, wherein, The mounting seat (311) is further provided with a second through hole (3112) therein 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), and the inner wall surface of the second through hole (3112) is provided with a third boss along the radial direction of the shaft core (12). The elastic connecting component (312) comprises: The first bolt (3121) comprises a rod portion and a head portion located at one end of the rod portion, the rod portion away from the head portion side passes through the second through hole (3112) and is connected with the mounting shell (11), and the third boss and the head portion have a mounting gap therebetween along the axial direction of the shaft core (12); The compression spring (3122) is sleeved on the rod portion and located in the mounting gap.

7. The hydrostatic spindle apparatus of claim 3, wherein, The second buckle assembly (32) comprises: The first mounting block (321) is fixedly connected with the outer circumferential surface of the shaft core (12) and located at one end of the mounting shell (11) close to the cylinder body (231); The second mounting block (322) is arranged on the end of the first mounting block (321) away from the mounting shell (11) along the axial direction of the shaft core (12), and at least partially protrudes from the outer circumferential surface of the first mounting block (321) along the radial direction of the shaft core (12) to form the first boss (331); The first locking member (323) detachably connects the second mounting block (322) and the first mounting block (321); And / or, the liquid static pressure spindle device further comprises: A sealing member (40) is sleeved on the outer circumferential surface of the shaft core (12) and located at the end of the mounting shell (11) close to the reverse buckling mechanism (30), and is used for sealing the mounting gap between the shaft core (12) and the end of the mounting shell (11) close to the reverse buckling mechanism (30).

8. The hydrostatic spindle apparatus according to any one of claims 2 to 7, characterized in that A limiting hole (123) in communication with the second mounting hole (122) is provided through the shaft core (12) in the radial direction of the shaft core (12), the limiting hole (123) extends in 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 cutter (50) and outside the first mounting hole (101), and the pressure fitting component (24) comprises: A pressing block (241) is provided with a third through hole (411) 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 driving of the piston (232); A pressure rod (242) is connected at one end to the pressing block (241) and at the other end to the pull rod component (21) through the limiting hole (123) and the second mounting hole (122), and the cross-sectional area of the pressure rod (242) is smaller than the minimum size of the limiting hole (123).

9. The hydrostatic spindle apparatus according to any one of claims 2 to 7, characterized in that The pull rod component (21) comprises: A pull rod body (211) is located in the second mounting hole (122), and opposite ends of the pull rod body (211) are respectively connected to the pressure fitting component (24) and the pull claw component (22); An elastic member (212) is telescopically sleeved on the pull rod body (211), and 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) in the axial direction of the shaft core (12), and the elastic member (212) can reciprocate between a compressed state and an extended state under the action of its own elastic force; During the switching of the elastic member (212) from the compressed state to the extended state, the pull rod body (211) is pulled to move away from the cutter (50) until the pull claw component (22) is in a gripping state, and when the pull rod body (211) moves towards the cutter (50) to make the pull claw component (22) in a loosening state, the elastic member (212) switches from the extended state to the compressed state.

10. The hydrostatic spindle apparatus according to any one of claims 2 to 7, characterized in that In the axial direction of the shaft core (12), the cutter (50) is provided with a mounting portion (51) on the side close to the shaft core (12), the mounting portion (51) is provided with a first groove (511) in the mounting portion (51), and the pull claw component (22) comprises: A connecting column (221) includes a first section (2211) and a second section (2212), the maximum width of the first section (2211) is less than the maximum width of the second section (2212) along the radial direction of the shaft core (12); A pull claw (222) is connected with the inner wall surface of the first mounting hole (101), the pull claw (222) is provided with a avoiding hole (2222), the pull rod component (21) is connected with the first section (2211) through the avoiding hole (2222) away from the hydraulic cylinder (23), the connecting column (221) can move relative to the pull claw (222) under the driving of the pull rod component (21), the pull claw (222) includes a plurality of interval arranged clamping pieces (2221) along the circumferential direction of the shaft core (12); The second section (2212) supports a plurality of clamping pieces (2221) away from each other in the direction of the radial direction of the shaft core (12) to tightly abut a plurality of clamping pieces (2221) between the inner wall surface of the first groove (511) and the outer circumferential surface of the second section (2212), the pull rod component (21) moves to the direction of close to the cutter (50) to the clamping pieces (2221) and the first section (2211) are arranged opposite to each other along the axial direction of the shaft core (12), a plurality of clamping pieces (2221) are close to each other to separate from the inner wall surface of the first groove (511) along the radial direction of the shaft core (12).

11. A machine tool, characterized by The machine tool comprises: The liquid static pressure spindle device of any one of claims 1 to 10.

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