Hydrostatic spindle automated tool changer and method

Abstract

The present application relates to the technical field of ultra-precision machining, and particularly relates to a static pressure spindle automatic tool changing device and method. The tool changing device comprises a tool changing frame, a plurality of locking assemblies and a plurality of screw adjusting assemblies. The tool changing frame is provided with a plurality of tool changing stations. The plurality of locking assemblies are arranged on the tool changing frame in one-to-one correspondence with the plurality of tool changing stations. The plurality of screw adjusting assemblies are arranged on the tool changing frame, and the positions of the plurality of screw adjusting assemblies correspond to the positions of the plurality of locking assemblies. The screw adjusting assemblies are used for adjusting the adjusting screws of the liquid expansion clamps. The locking assemblies are arranged on the tool changing frame to lock the tools. The screw adjusting assemblies are used for adjusting the adjusting screws of the liquid expansion clamps, so that the liquid expansion clamps are in a clamping state or a loosening state. The automatic tool changing is realized through the cooperation of the locking assemblies, the screw adjusting assemblies and the liquid expansion clamps. The whole process does not need human intervention, improves the work efficiency, avoids the risks in the process of manual tool changing and improves the safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultra-precision machining, and particularly relates to an automatic tool changing device and method for a hydrostatic spindle. BACKGROUND

[0002] In the machining industry, efficient and accurate operation of machine tools plays a decisive role in production efficiency and product quality. Hydrostatic spindles are widely used in ultra-precision machining due to their high precision, high rigidity, and good damping characteristics. However, the existing tool changing methods for hydrostatic spindles have many drawbacks due to the lack of a tool changing pull rod.

[0003] Currently, most tool changing methods for hydrostatic spindles rely on manual operation. Manual tool changing requires first stopping the machine tool, then manually disassembling the old tool, and replacing the new tool. This manual tool changing method is not only inefficient, discontinuous in production, and cannot be used in automated production lines, but also poses a significant safety risk due to frequent manual tool changing operations. SUMMARY

[0004] The present application provides an automatic tool changing device for a hydrostatic spindle to solve the problems of low efficiency and high safety risk in existing tool changing methods for hydrostatic spindles.

[0005] The present application provides an automatic tool changing device for a hydrostatic spindle, comprising:

[0006] a tool changing frame provided with a plurality of tool changing stations;

[0007] a plurality of locking components corresponding to the plurality of tool changing stations and arranged on the tool changing frame, the locking components being used to lock the tools;

[0008] a plurality of screw adjusting components arranged on the tool changing frame, the positions of the plurality of screw adjusting components corresponding to the positions of the plurality of locking components, the screw adjusting components being used to adjust the adjusting screws of the liquid expansion clamps to place the liquid expansion clamps in a clamped state or a loosened state.

[0009] According to the automatic tool changing device for a hydrostatic spindle provided by the present application, the plurality of screw adjusting components are arranged equidistantly along the length direction of the tool changing frame.

[0010] According to the automatic tool changing device for a hydrostatic spindle provided by the present application, the screw adjusting component comprises:

[0011] a torque wrench;

[0012] a torque motor mounting plate arranged on the upper part of the tool changing frame;

[0013] A driving member is arranged on the upper portion of the torque motor mounting plate, the rotating shaft of the driving member is detachably connected with the torque wrench, and the driving member is used to drive the torque wrench to rotate, so as to adjust the adjusting screw of the liquid expansion clamp.

[0014] According to the static pressure spindle automatic tool changing device provided by the application, the rotating shaft of the driving member is detachably connected with the torque wrench.

[0015] According to the static pressure spindle automatic tool changing device provided by the application, a plurality of locking assemblies are arranged at equal intervals along the length direction of the tool changing frame.

[0016] According to the static pressure spindle automatic tool changing device provided by the application, the locking assembly comprises:

[0017] Two clamping mechanisms, the tool changing station is provided with a clamping groove, the two opposite side walls of the clamping groove are provided with guide grooves, the clamping mechanism is movably arranged in the guide groove, the clamping mechanism is adapted to switch between the extended state and the retracted state, when the tool passes through the clamping opening of the clamping groove, the clamping mechanism is in the retracted state, so that the tool is clamped into the clamping groove, when the tool enters or leaves the clamping groove, the clamping mechanism is in the extended state, so as to lock the tool in the clamping groove.

[0018] According to the static pressure spindle automatic tool changing device provided by the application, the clamping mechanism comprises:

[0019] A support is slidably arranged in the guide groove;

[0020] An elastic member is arranged in the guide groove, one end of the elastic member is connected with the bottom wall of the guide groove, and the other end of the elastic member is connected with the end of the support away from the clamping groove.

[0021] According to the static pressure spindle automatic tool changing device provided by the application, the clamping mechanism further comprises:

[0022] A locking wheel is rollingly connected with the end of the support close to the clamping groove through a connecting pin.

[0023] According to the static pressure spindle automatic tool changing device provided by the application, a proximity switch is arranged in the clamping groove, and the proximity switch is used to sense whether the tool exists in the clamping groove.

[0024] The application also provides a static pressure spindle automatic tool changing method, the tool changing method is based on the static pressure spindle automatic tool changing device of any one of the above, and the tool changing method comprises the following steps:

[0025] According to the actual position of the adjusting screw, the angle of rotation required by the static pressure spindle during tool changing is determined, according to the actual position of the tool changer, the height at which the static pressure spindle should be during tool changing is determined to ensure that the height of the adjusting screw matches the height of the rotating wrench; the angle of rotation required by the rotating wrench when the liquid expansion clamp switches between the clamping state and the loosening state is determined;

[0026] According to the position information of the empty tool changing station, the X-axis, Y-axis and Z-axis of the machine tool are driven to move, ensuring that the static pressure spindle moves to the position corresponding to the empty tool changing station, so that the locking assembly of the empty tool changing station locks the tool; the tool triggers the proximity switch to output a signal to control the driving member to rotate reversely by a predetermined angle, so that the liquid expansion clamp loosens, and the tool is stored in the tool changing station;

[0027] The static pressure spindle is controlled to first rise to the zero position of the Z-axis, the X-axis, Y-axis and Z-axis of the machine tool are driven to move according to the position information of the target tool, so that the tool shank of the target tool is inserted into the liquid expansion clamp; the driving member is controlled to rotate forward by a predetermined angle, so that the liquid expansion clamp clamps the tool; the tool is moved by the static pressure spindle to release the locking of the locking assembly on the tool;

[0028] The static pressure spindle is controlled to move to a safe position and rise to the zero position of the Z-axis.

[0029] The static pressure spindle automatic tool changing device provided by the application locks the tool by setting a locking assembly on the tool changer, adjusts the adjusting screw of the liquid expansion clamp through the screw adjusting assembly, so that the liquid expansion clamp is in the clamping state or the loosening state, and automatically changes the tool through the cooperation of the locking assembly, the screw adjusting assembly and the liquid expansion clamp. The whole process does not need human intervention, improves the work efficiency, avoids the risk in the process of manually changing the tool, and improves the safety. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is the front view structural schematic diagram of the static pressure spindle automatic tool changing device and the static pressure spindle provided by the application.

[0032] Figure 2 is the side view structural schematic diagram of the static pressure spindle automatic tool changing device and the static pressure spindle provided by the application.

[0033] Figure 3is Figure 1 Partial enlarged structural schematic view at A in figure.

[0034] Reference signs:

[0035] 10, tool changer; 11, clamping groove; 20, locking assembly; 21, bracket; 22, elastic member; 23, locking wheel; 24, proximity switch; 30, screw adjusting assembly; 31, torque wrench; 32, torque motor mounting plate; 33, driving member; 40, machine tool base; 50, hydrostatic spindle; 51, adjusting screw; 52, liquid expansion clamp. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0037] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0041] As shown in Figure 1 and Figure 2 The static pressure spindle automatic tool changer includes a tool changer 10, a plurality of locking assemblies 20 and a plurality of screw adjusting assemblies 30. The tool changer 10 is provided with a plurality of tool changing stations. The plurality of locking assemblies 20 are arranged one by one on the tool changer 10 corresponding to the plurality of tool changing stations, and the locking assemblies 20 are used to lock the tool. The plurality of screw adjusting assemblies 30 are arranged on the tool changer 10, and the positions of the plurality of screw adjusting assemblies 30 correspond one by one to the positions of the plurality of locking assemblies 20. The screw adjusting assembly 30 is used to adjust the adjusting screw 51 of the liquid expansion clamp 52, so that the liquid expansion clamp 52 is in a clamping state or a loosening state.

[0042] The static pressure spindle automatic tool changing device provided by the application locks the tool by setting a locking assembly 20 on the tool changer 10, adjusts the adjusting screw 51 of the liquid expansion clamp 52 through the screw adjusting assembly 30, so that the liquid expansion clamp 52 is in a clamping state or a loosening state, and realizes automatic tool changing through the cooperation of the locking assembly 20, the screw adjusting assembly 30 and the liquid expansion clamp 52. The whole process does not need human intervention, improves the work efficiency, avoids the risk in the process of manual tool changing, and improves the safety. In the tool changing process, the automatic loosening, storage and clamping of the tool are realized by accurately controlling the height and rotation angle of the static pressure spindle 50 and the forward and reverse rotation of the driving part 33. The whole process does not need human intervention, greatly improves the production efficiency and the automation level. At the same time, the automatic tool changing device of the static pressure spindle also reduces the errors and safety risks caused by manual operation, provides an efficient and safe tool changing solution for the ultra-precision machining field.

[0043] In an embodiment of the application, as shown in Figure 1 and Figure 2 The static pressure spindle automatic tool changing device further comprises a machine tool base 40, which provides a stable installation foundation for the tool changer 10. The stability of the machine tool base 40 is crucial to the accuracy and reliability of the whole tool changing process. It can effectively reduce the vibration and error that may occur during the tool changing process and ensure the stability of the tool in the locked and loosened states. As shown in Figure 1 The tool changer 10 is arranged along the left-right direction, and the tool changer 10 is arranged on the upper part of the machine tool base 40. The tool changer 10 extends along the left-right direction, and the length of the tool changer 10 is determined according to the number of tool changing stations to be set. Preferably, a plurality of tool changing stations are arranged at equal intervals along the length direction of the tool changer 10. The equally spaced tool changing stations make the distribution of tools on the tool changer 10 more uniform, which is conducive to maintaining the balance of the tool changer 10 and also facilitates accurate tool position recognition and operation by the automatic control system.

[0044] In an embodiment of the application, a plurality of screw adjusting assemblies 30 are arranged at equal intervals along the length direction of the tool changer 10, and the screw adjusting assemblies 30 are responsible for the installation and disassembly of the tools on the corresponding tool changing stations.

[0045] In an embodiment of the application, as shown in Figure 1 and Figure 2As shown, the screw adjusting assembly 30 includes a torque wrench 31, a torque motor mounting plate 32 and a driving member 33. The torque motor mounting plate 32 is arranged on the upper portion of the tool changer 10 and serves as a stable mounting base for the driving member 33. The driving member 33 is arranged on the upper portion of the torque motor mounting plate 32 and has a rotating shaft connected with the torque wrench 31. The driving member 33 is used to drive the torque wrench 31 to rotate so as to adjust the adjusting screw 51 of the liquid expansion clamp 52. The driving member 33 is a driving motor or a combination of a driving motor and a speed reducer. Preferably, the driving member 33 is provided with an angle sensor for detecting the rotating angle of the rotating shaft of the driving member 33, so as to realize accurate control of the driving member 33. The arrangement of the angle sensor further improves the accuracy and automation degree of the tool changing process. By monitoring the rotating angle of the rotating shaft in real time, the control system can accurately control the rotating amount of the driving member 33, so as to ensure that the adjusting screw 51 of the liquid expansion clamp 52 accurately reaches the required clamping or loosening position.

[0046] During tool changing, the torque wrench 31 is connected with the adjusting screw 51, and the driving member 33 is controlled to rotate forward or reversely. The driving member 33 drives the torque wrench 31 to rotate the adjusting screw 51 forward or reversely, so as to realize automatic switching of the liquid expansion clamp 52 between the clamping state and the loosening state. The screw adjusting assembly 30 can accurately adjust the tightness of the liquid expansion clamp 52, so as to ensure the stability and reliability of the tool during machining. The screw adjusting assembly 30 not only improves the tool changing efficiency, but also effectively avoids tool damage or machining errors caused by excessive or insufficient adjustment, and further improves the performance and stability of the entire device.

[0047] In an embodiment of the present application, the rotating shaft of the driving member 33 is detachably connected with the torque wrench 31. The torque wrench 31 is detachably connected with the driving member 33, so as to facilitate quick replacement of the torque wrench 31 matched with the liquid expansion clamp 52 according to different specifications, and improve the universality and flexibility of the device. For example, when a larger tool needs to be replaced, a torque wrench 31 with higher torque may be needed to adjust the clamping force of the liquid expansion clamp 52; and when a smaller tool needs to be replaced, a torque wrench 31 with lower torque may be needed to avoid excessive clamping and cause tool damage. Through this detachable connection mode, the operator can complete the replacement of the torque wrench 31 within a few minutes without the need for complex tools or adjustments, which greatly improves the tool changing efficiency.

[0048] In an embodiment of the present application, the plurality of locking assemblies 20 are arranged at equal intervals along the length direction of the tool changer 10. This uniform arrangement also facilitates accurate positioning and operation of the automatic control system, and improves the accuracy and reliability of the tool changing process.

[0049] In an embodiment of the present application, as shown in FIG. 6, the tool changer 10 is provided with a plurality of locking assemblies 20 arranged at equal intervals along the length direction of the tool changer 10. The locking assemblies 20 are arranged on the upper portion of the tool changer 10 and are used to fix the tool 50 in the tool changing process. The tool 50 is clamped by the liquid expansion clamp 52 and is fixed by the locking assemblies 20, so as to ensure the stability of the tool 50 during machining. Figure 3As shown, the locking assembly 20 includes two clamping mechanisms, the tool changing station is provided with a clamping groove 11, the opposite two side walls of the clamping groove 11 are provided with guide grooves, the clamping mechanism is movably arranged in the guide groove, and the clamping mechanism is adapted to switch between the extended state and the retracted state, when the tool passes through the clamping opening of the clamping groove 11, the clamping mechanism is in the retracted state, so that the tool is clamped into the clamping groove 11; when the tool enters or leaves the clamping groove 11, the clamping mechanism is in the extended state, so as to lock the tool in the clamping groove 11. By adopting this clamping mode, not only the installation and replacement efficiency of the tool is improved, but also the stability of the tool during machining is enhanced, and the machining error and equipment damage risk caused by loose tool are effectively avoided. Through the flexible switching of the clamping mechanism, the quick locking and releasing of the tool are realized, and the automation degree and reliability of the whole tool changing device are further improved.

[0050] In an embodiment of the present application, as shown in the drawings, Figure 3 The clamping mechanism includes a bracket 21 and an elastic element 22, the bracket 21 is in a block structure, the bracket 21 is slidably arranged in the guide groove, the elastic element 22 is arranged in the guide groove, one end of the elastic element 22 is connected with the bottom wall of the guide groove, and the other end of the elastic element 22 is connected with the end of the bracket 21 away from the clamping groove 11. The elastic element 22 is a compression spring, which can provide stable elastic support when the tool enters or leaves the clamping groove 11, and ensure smooth movement of the clamping mechanism. Of course, the specific type of the elastic element 22 is not limited to this, and spring sheets or other elastic mechanisms can also be used, which can be determined according to actual needs.

[0051] In an embodiment of the present application, the clamping mechanism further includes a locking wheel 23, which is in rolling contact with the end of the bracket 21 close to the clamping groove 11 through a connecting pin. When the tool passes through the clamping opening of the clamping groove 11, the locking wheel 23 is in rolling contact with the tool shank. By arranging the locking wheel 23, not only the resistance of the tool when entering and leaving the clamping groove 11 is reduced, but also the positioning accuracy and tool changing efficiency of the tool are improved. Compared with the traditional sliding contact, the rolling contact mode of the locking wheel 23 can guide the tool into the clamping groove 11 more smoothly, reduce the heat and stress generated by friction, and further protect the tool. In addition, the clamping mechanism in the locking assembly 20 adopts the cooperation of the elastic element 22 and the locking wheel 23, which can not only adapt to tools of different sizes, but also automatically adjust the clamping force when the tool is clamped or released by the hydraulic expansion clamp 52, further enhancing the fixing effect and replacement efficiency of the tool.

[0052] In one embodiment of the present application, a proximity switch 24 is arranged in the card slot 11, which is used to sense whether a tool exists in the card slot 11. The proximity switch 24 in the card slot 11 can sense the presence state of the tool in real time, and ensure that the tool is locked or released only when it is in the correct position, effectively avoiding the risk of tool falling or damage, and improving the reliability and stability of the entire tool changing process.

[0053] Further, a proximity switch 24 is also arranged below the card slot 11, which is used to detect whether the tool is placed in place in the up-down direction, preventing the tool from being placed out of place in the up-down direction, which affects the installation of the next tool.

[0054] The present application also provides an automatic tool changing method of the hydrostatic spindle 50, which is based on the automatic tool changing device of the hydrostatic spindle of any one of the above embodiments, and comprises the following steps:

[0055] The angle of rotation of the hydrostatic spindle 50 required during tool changing is determined according to the actual position of the adjusting screw 51, the height of the hydrostatic spindle 50 during tool changing is determined according to the actual position of the tool changer 10, to ensure that the height of the adjusting screw 51 matches the height of the rotating wrench, and the rotation angle of the rotating wrench required when the liquid expansion clamp 52 switches between the clamping state and the released state is determined.

[0056] It should be noted that before the above steps are performed, the position coordinates of each tool changing station need to be accurately calibrated in the machine tool numerical control system.

[0057] The X-axis, Y-axis and Z-axis of the machine tool are driven to move according to the position information of the empty tool changing station, to ensure that the hydrostatic spindle 50 moves to the position corresponding to the empty tool changing station, so that the locking assembly 20 of the empty tool changing station locks the tool, and the tool triggers the proximity switch 24 to output a signal to control the driving member 33 to rotate reversely by a predetermined angle, so that the liquid expansion clamp 52 is released, and the tool is stored in the tool changing station.

[0058] It should be noted that the step of locking the tool by the locking assembly 20 of the empty tool changing station comprises the following steps: when the tool enters the card slot 11, the tool shank of the tool is in motion cooperation with the locking wheel 23, the locking wheel 23 pushes the bracket 21 into the guide groove, so that the tool enters the card slot 11, and after the tool enters the card slot 11, the locking wheel 23 extends out of the card slot 11 under the action of the elastic member 22, to lock the tool in the card slot 11.

[0059] The static pressure spindle 50 is first lifted to the zero position of the Z axis, the X axis, the Y axis and the Z axis of the machine tool are driven to move according to the position information of the target tool, so that the tool bar of the target tool is inserted into the liquid expansion clamp 52; the driving member 33 is controlled to rotate forward by a predetermined angle, so that the liquid expansion clamp 52 clamps the tool; the tool is moved by the static pressure spindle 50 to release the locking of the tool by the locking assembly 20.

[0060] The static pressure spindle 50 is moved to the safe position and lifted to the zero position of the Z axis.

[0061] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A static pressure spindle automatic tool changing device, characterized in that: include: A tool changing rack (10), wherein the tool changing rack (10) is provided with a plurality of tool changing stations; A plurality of locking assemblies (20), wherein the plurality of locking assemblies (20) are arranged on the tool changing frame (10) in a one-to-one correspondence with the plurality of tool changing stations, and the locking assemblies (20) are used to lock the tool; a plurality of screw adjustment assemblies (30), the plurality of screw adjustment assemblies (30) being arranged on the tool changer (10), the positions of the plurality of screw adjustment assemblies (30) corresponding one-to-one to the positions of the plurality of locking assemblies (20), the screw adjustment assemblies (30) being used to adjust the adjustment screws (51) of the liquid expansion clamp (52) so as to place the liquid expansion clamp (52) in a clamped state or a loosened state; The locking assembly (20) comprises: Two clamping mechanisms, the tool changing station is provided with a card slot (11), and two opposite side walls of the card slot (11) are provided with guide slots, the clamping mechanism is movably arranged in the guide slot, and the clamping mechanism is suitable for switching between an extended state and a retracted state. When the tool passes through the bayonet of the card slot (11), the clamping mechanism is in a retracted state so that the tool is clamped into the card slot (11); when the tool enters the card slot (11) or moves away from the card slot (11), the clamping mechanism is in an extended state so that the tool is locked in the card slot (11); A proximity switch (24) is provided in the card slot (11), and the proximity switch (24) is used to sense whether the tool is in the card slot (11), ensuring that the tool is locked or released only when it is in the correct position; the proximity switch (24) is also provided below the card slot (11), and the proximity switch (24) is used to detect whether the tool is placed in place in the upper and lower directions; A plurality of the screw adjustment assemblies (30) are arranged at equal intervals along the length direction of the tool changer (10); The screw adjustment assembly (30) comprises: Torque wrench (31); a torque motor mounting plate (32), the torque motor mounting plate (32) being arranged on an upper portion of the tool changer (10); A driving member (33) is provided on the upper portion of the torque motor mounting plate (32), a rotating shaft of the driving member (33) is connected to the torque wrench (31), and the driving member (33) is used to drive the torque wrench (31) to rotate so as to adjust the adjusting screw (51) of the liquid expansion clamp (52).

2. The hydrostatic spindle automatic tool changing device according to claim 1, characterized in that: The rotating shaft of the driving member (33) is detachably connected to the torque wrench (31).

3. The hydrostatic spindle automatic tool changing device according to claim 1 or 2, characterized in that: The plurality of locking assemblies (20) are arranged at equal intervals along the length direction of the tool changer (10).

4. The hydrostatic spindle automatic tool changing device according to claim 3, characterized in that: The clamping mechanism comprises: a bracket (21), the bracket (21) being slidably disposed in the guide groove; An elastic member (22) is disposed in the guide groove, one end of the elastic member (22) is connected to the bottom wall of the guide groove, and the other end of the elastic member (22) is connected to an end of the bracket (21) away from the card slot (11).

5. The hydrostatic spindle automatic tool changing device according to claim 4, characterized in that: The clamping mechanism further comprises: A locking wheel (23) is rollingly engaged with an end of the bracket (21) close to the slot (11) via a connecting pin.

6. A method for automatically changing a tool for a hydrostatic spindle (50), the method being based on the hydrostatic spindle automatic tool changing device according to any one of claims 1 to 5, characterized in that: include: Determining the angle of rotation of the static pressure spindle (50) required during tool change based on the actual position of the adjusting screw (51), and determining the height of the static pressure spindle (50) during tool change based on the actual position of the tool changer (10) to ensure that the height of the adjusting screw (51) matches the height of the rotary wrench; determining the angle of rotation of the rotary wrench required when the liquid expansion clamp (52) switches between a clamped state and a released state; According to the position information of the empty tool changing station, the X-axis, Y-axis and Z-axis of the machine tool are driven to move, ensuring that the hydrostatic spindle (50) moves to a position corresponding to the empty tool changing station, so that the locking assembly (20) of the empty tool changing station locks the tool; the tool triggers the proximity switch (24) to output a signal to control the driving member (33) to rotate in the opposite direction by a predetermined angle, so that the liquid expansion clamp (52) is released, and the tool is stored in the tool changing station; The static pressure spindle (50) is controlled to be raised to the zero position of the Z axis, and the X axis, Y axis and Z axis of the machine tool are driven to move according to the position information of the target tool, so that the tool rod of the target tool is inserted into the liquid expansion clamp (52); the driving member (33) is controlled to rotate forward by a predetermined angle, so that the liquid expansion clamp (52) clamps the tool; the tool is driven to move by the static pressure spindle (50), so that the locking assembly (20) releases the lock on the tool; The static pressure spindle (50) is controlled to move to a safe position and raised to the zero position of the Z axis.

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