Gas-liquid pressurized automatic tool changing electric spindle

Abstract

The utility model discloses a kind of gas-liquid pressure boost automatic tool changing electric main shaft, including main shaft and the tool shank component being set on the one end surface of the main shaft, cylinder device is set on the other end surface of the main shaft, the cylinder device includes the connecting body being set on the other end surface of the main shaft, first cylinder piece is set on the end surface of the connecting body, second cylinder piece is set on the end surface of the first cylinder piece, end cover is set on the second cylinder piece, unloading tool inlet is set on the end cover, the second cylinder piece and the end cover form inlet compression cavity, the unloading tool inlet and the inlet compression cavity are connected, and the second cylinder piece is provided with pressure boost oil cavity.In the utility model, its structure and volume and weight are improved, which is beneficial to the installation of corresponding supporting equipment.

Description

Technical Field

[0001] This utility model relates to the field of motor spindle technology, and in particular to a pneumatic-hydraulic booster automatic tool-changing electric spindle. Background Technology

[0002] Common automatic tool changer (APC) electric spindles integrate a high-speed asynchronous motor, a cylinder, and a tool release / withdrawing mechanism, creating a mechatronic power unit that achieves high speed, high precision, and high efficiency. They are primarily used in high-speed machine tools to enable high-speed machining of various materials, thereby improving processing efficiency. Traditional APC models include those with externally mounted booster cylinders and purely pneumatic multi-stage booster cylinders. However, existing models suffer from large size and weight, limiting installation space for supporting equipment and resulting in excessive operating loads, thus failing to meet usage requirements. Therefore, improvements to the existing technology are necessary. Utility Model Content

[0003] (a) Technical problems that need to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a gas-liquid booster automatic tool changer spindle, which has an optimized structure and improved size and weight, facilitating the installation of corresponding supporting equipment. At the same time, it adopts gas compression and liquid booster, and this hybrid output greatly increases the pressure output power, which can better achieve the thrust required for tool changing, thereby completing tool unloading.

[0005] (ii) Technical solutions to be adopted

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A pneumatic-hydraulic booster automatic tool changer includes a spindle and a tool holder assembly disposed on one end face of the spindle. A cylinder device is disposed on the other end face of the spindle. The cylinder device includes a connecting body disposed on the other end face of the spindle. A first cylinder component is disposed on the end face of the connecting body. A second cylinder component is disposed on the end face of the first cylinder component. An end cover is disposed on the second cylinder component. A tool unloading air inlet is disposed on the end cover. The second cylinder component and the end cover form an air intake compression chamber. The tool unloading air inlet is connected to the air intake compression chamber. A booster oil chamber is disposed in the second cylinder component.

[0008] Preferably, the connecting body is provided with a reset air inlet and a cooling interface, the connecting body is provided with a tool unloading rod in the axial direction, the tool unloading rod is provided with a central dust removal interface in the axial direction, the connecting body is provided with a first reset air inlet channel, and the reset air inlet is connected to the first reset air inlet channel.

[0009] Preferably, the spindle is provided with a cooling channel that communicates with the cooling interface.

[0010] Preferably, the first cylinder component includes a first cylinder body fixed on the connecting body, the first cylinder body is provided with a booster oil chamber, a first piston is provided inside the first cylinder body at a position below the booster oil chamber, a return spring is sleeved on the first piston, and the first cylinder body is provided with a second return air intake channel and a third return air intake channel, the first return air intake channel and the third return air intake channel are connected through the second return air intake channel.

[0011] Preferably, the second cylinder component includes a second cylinder body fixed to the first cylinder body, a second piston is disposed inside the second cylinder body, and a booster rod is disposed on the second piston, the booster rod moving back and forth in the booster oil chamber.

[0012] Preferably, the spindle includes a housing fixed to the connecting body. An axial hole is provided inside the housing, and an axially sliding push rod is installed in the axial hole. The push rod can move forward by being pushed by the tool unloading rod. A disc spring is provided on the push rod. From the inside to the outside, a rotating shaft core, a rotor core, and a stator core are arranged sequentially inside the housing centered on the push rod. A stator winding is provided on the stator core. A front bearing is fitted at the front of the rotating shaft core inside the housing, and a rear bearing is fitted at the front of the rotating shaft core inside the housing. The tool holder assembly is provided at the front end of the push rod, passing through the front bearing assembly. A position sensor for sensing the push rod is provided inside the housing.

[0013] Preferably, the front bearing component includes a front bearing disposed on the front part of the rotating shaft core inside the housing, and a front pressure cover is provided on the front end face of the housing at the end face of the front bearing, and the front pressure cover is locked to the front end face of the housing by a front lock nut.

[0014] Preferably, two front bearings are used, and a front spacer is provided between the two front bearings.

[0015] Preferably, the rear bearing component includes a rear mounting seat disposed on the rear part of the rotating shaft core inside the housing, the rear mounting seat being provided with a rear bearing, and the rear mounting seat being provided with a rear cover plate for pressing the rear bearing.

[0016] Preferably, the tool holder assembly includes a pull claw disposed inside the rotating shaft core, a pull stud disposed on the pull claw, a tool holder body disposed on the pull stud, and the tool holder body extending out from the end face of the rotating shaft core.

[0017] (III) The technical effects to be achieved

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] Firstly, the cylinder device of this utility model includes a connecting body disposed on the other end face of the spindle. A first cylinder component is disposed on the end face of the connecting body, and a second cylinder component is disposed on the end face of the first cylinder component. An end cover is disposed on the second cylinder component, and a tool unloading air inlet is disposed on the end cover. The second cylinder component and the end cover form an air intake compression chamber. The tool unloading air inlet is connected to the air intake compression chamber. A booster oil chamber is disposed in the second cylinder component. Its structure is optimized, and its volume and weight are improved, which is conducive to the installation of corresponding supporting equipment. At the same time, the use of gas compression and liquid booster, this mixed output greatly increases the pressure output power, which can better realize the thrust required for tool unloading, thereby completing the tool unloading operation.

[0020] Secondly, the connector of this utility model is provided with a reset air inlet and a cooling interface. A tool unloading rod is provided in the axial direction of the connector, and a central dust removal interface is provided in the axial direction of the tool unloading rod. A first reset air inlet channel is provided on the connector, and the reset air inlet is connected to the first reset air inlet channel. This is beneficial for arranging the reset air inlet and cooling interface in the connector, which is beneficial for better air intake and cooling water delivery. In addition, the overall length of the connector is also reduced, which makes assembly and docking easier and better meets the production process requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of this utility model.

[0023] Figure 3 This is a cross-sectional view of the present invention.

[0024] Figure 4 This is a cross-sectional view of the cylinder device of this utility model.

[0025] In the diagram: 1. Spindle; 2. Tool holder assembly; 3. Cylinder assembly; 10. Housing; 11. Push rod; 12. Disc spring; 13. Rotary shaft core; 14. Rotor core; 15. Stator core; 16. Stator winding; 17. Front bearing assembly; 18. Rear bearing assembly; 19. Position sensor; 21. Pull claw; 22. Pull stud; 23. Tool holder body; 31. Connector; 32. First cylinder assembly; 33. Second cylinder assembly; 34. End cap; 35. Unloading air inlet; 36. Air inlet compression chamber; 37. Pressurized oil chamber; 171. Front bearing; 172. Front pressure cover; 1 73, Front lock nut; 174, Front spacer ring; 181, Rear mounting base; 182, Rear bearing; 183, Rear cover plate; 184, Rear lock nut; 311, Reset air inlet; 312, Cooling interface; 313, Unloader push rod; 314, Center dust removal interface; 315, First reset air inlet channel; 316, Cooling channel; 321, First cylinder; 322, First piston; 323, Reset spring; 324, Second reset air inlet channel; 325, Third reset air inlet channel; 331, Second cylinder; 332, Second piston; 333, Pressure booster rod. Detailed Implementation

[0026] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0027] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0030] Example 1: See Figure 1 , Figure 2 , Figure 3 and Figure 4 A pneumatic-hydraulic booster automatic tool changer spindle includes a spindle 1 and a tool holder assembly 2 disposed on one end face of the spindle 1. A cylinder device 3 is disposed on the other end face of the spindle 1. The cylinder device 3 includes a connecting body 31 disposed on the other end face of the spindle 1. A first cylinder component 32 is disposed on the end face of the connecting body 31. A second cylinder component 33 is disposed on the end face of the first cylinder component 32. An end cover 34 is disposed on the second cylinder component 33. A tool unloading air inlet 35 is disposed on the end cover 34. The second cylinder component 33 and the end cover 34 are connected. The cover 34 has an air intake compression chamber 36, and the tool unloading air inlet 35 is connected to the air intake compression chamber 36. The second cylinder 33 has a booster oil chamber 37. Air enters the second cylinder 33 through the tool unloading air inlet 35 and is compressed. The thrust generated by the air intake compression chamber 36 pushes the gas into the booster oil chamber 37 in the first cylinder 32. The second cylinder 33 continuously receives air and compresses it. The second cylinder 33 and the first cylinder 32 form a significant pressure difference, resulting in the thrust. This invention has fewer components—spindle 1, tool holder assembly 2, and cylinder device 3—reducing the manufacturing process, assembly difficulty, and improving production efficiency, facilitating mass production.

[0031] Example 2: This can be explained based on Example 1, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the connecting body 31 is provided with a reset air inlet 311 and a cooling interface 312. A tool unloading rod 313 is axially arranged on the connecting body 31, and a central dust removal interface 314 is axially arranged on the tool unloading rod 313. A first reset air inlet channel 315 is provided on the connecting body 31, and the reset air inlet 311 is connected to the first reset air inlet channel 315. This arrangement is reasonable, simple in structure, and facilitates manufacturing and installation. Furthermore, the length of the connecting body 31 is optimized, which further reduces the difficulty of assembly and docking. To elaborate further, the spindle 1 is provided with a cooling channel 316 connected to the cooling interface 312. This arrangement is reasonable and facilitates the input of cold water for cooling.

[0032] Among them, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the first cylinder component 32 includes a first cylinder body 321 fixed on the connecting body 31. The first cylinder body 321 has a booster oil chamber 37 inside. The first piston 322 is located inside the first cylinder body 321 below the booster oil chamber 37. A return spring 323 is sleeved on the first piston 322 (to prevent the return air inlet 311 from failing). When the first piston 322 is in motion, it pushes the unloader rod 313 to move. The first cylinder body 321 has a second return air inlet channel 324 and a third return air inlet channel 325. The first return air inlet channel 315 and the third return air inlet channel 325 are connected by the second return air inlet channel 324. The return air inlet 311 facilitates air intake. This first piston 322 will push the unloader rod 313 to move forward. Further explanation: The second cylinder component 33 includes a second cylinder body 331 fixed to the first cylinder body 321. A second piston 332 is disposed inside the second cylinder body 331, and a booster rod 333 is disposed on the second piston 332. The booster rod 333 moves back and forth in the booster oil chamber 37. During use, air enters through the unloading air inlet 35 and is compressed at the end face of the second piston 332. The thrust generated by the air intake compression chamber 36 pushes towards the booster oil chamber 37 and the end face of the first piston 322. The second piston 332 and the first piston 322 move forward rapidly and synchronously. The unloading push rod 313 contacts the components inside the spindle 1 and pushes them forward. Simultaneously, the second piston 332 continues to receive air, which facilitates air compression. At this time, the booster rod 333 on the second piston 332 and the first piston 322 form a significant pressure difference, ultimately generating a thrust that pushes towards the components inside the spindle 1. The reduced outer diameter of the first cylinder body 321 can be used to prevent air leakage and includes a multi-functional interface distribution, which is more conducive to meeting usage requirements.

[0033] Among them, such as Figure 1 , Figure 3 and Figure 4As shown, the end cap 34 and the second cylinder body 331 are fixedly connected by fasteners, which are generally bolts or screws, making them easy to disassemble and install.

[0034] Example 3: This can be explained based on Example 2, such as... Figure 3 and Figure 4 As shown, the spindle 1 includes a housing 10 fixed to the connecting body 31. An axial hole is provided inside the housing 10, and an axially sliding push rod 11 is installed in the axial hole. The push rod 11 can move forward by being pushed by the tool unloading push rod 313. A disc spring 12 is provided on the push rod 11. Inside the housing 10, centered on the push rod 11, from the inside out, are arranged a rotating shaft core 13, a rotor core 14, and a stator core 15. A stator winding 16 is provided on the stator core 15. A front bearing 17 is fitted at the front of the rotating shaft core 13 inside the housing 10, and a rear bearing 18 is fitted at the front of the rotating shaft core 13 inside the housing 10. A tool holder assembly 2 is provided at the front end of the push rod 11, and the tool holder assembly 2 passes through the front bearing. 17. The housing 10 is equipped with a position sensor 19 for sensing the push rod 11. After the unloading air inlet 35 receives air into the end face of the second piston 332, the gas is compressed. The thrust generated by the air intake compression chamber 36 pushes the pressure boosting oil chamber 37 and the end face of the first piston 322. The second piston 332 and the first piston 322 move forward rapidly and synchronously. The unloading push rod 313 pushes the push rod 11 inside the housing 10 forward. At the same time, the second piston 332 continues to receive air, which is beneficial for air compression. At this time, the pressure boosting rod 333 on the second piston 332 and the first piston 322 form a huge pressure boosting difference. The resulting thrust pushes the push rod 11, which is beneficial for changing the tool in the tool holder assembly 2.

[0035] Among them, such as Figure 3 As shown, the front bearing component 17 includes a front bearing 171 mounted on the front part of the rotating shaft core 13 inside the housing 10. A front pressure cover 172 is provided on the front end face of the housing 10 at the end face of the front bearing 171. The front pressure cover 172 is locked to the front end face of the housing 10 by a front lock nut 173, which makes the locking more secure and safer and more reliable under high-speed operation. Further, two front bearings 171 are used, with a front spacer 174 provided between the two front bearings 171. This arrangement is more reasonable and easier to implement.

[0036] Among them, such as Figure 3As shown, the rear bearing assembly 18 includes a rear mounting seat 181 located on the rear part of the rotating shaft core 13 inside the housing 10. A rear bearing 182 is mounted on the rear mounting seat 181, and a rear cover plate 183 is provided on the rear mounting seat 181 to press the rear bearing 182 tightly. This arrangement is reasonable and easy to implement. In this embodiment, two rear bearings 182 are used, which is beneficial for more stable and reliable operation. Further, the rear cover plate 183 inside the housing 10 is fixedly connected to the rear part of the tool holder assembly 2 by a rear locking nut 184. This arrangement is reasonable and easy to implement.

[0037] Among them, such as Figure 3 As shown, the position sensor 19 is located at the rear of the push rod 11. This arrangement is reasonable. The position sensor 19 detects a significant change in distance to determine the position and status of the push rod 11, ensuring the efficient operation of the automatic tool changer and thus improving the reliability and safety of use.

[0038] Example 4: This can be explained based on Example 3, such as... Figure 3As shown, the tool holder assembly 2 includes a pull claw 21 (also called a flap claw) disposed inside the rotating shaft core 13. A pull stud 22 is disposed on the pull claw 21, and a tool holder body 23 is disposed on the pull stud 22. The tool holder body 23 extends out from the end face of the rotating shaft core 13. In use, after air enters the end face of the second piston 332 through the unloading air inlet 35, the gas is compressed. The thrust generated by the air inlet compression chamber 36 pushes the pressure boosting oil chamber 37 and the end face of the first piston 322, and the second piston 332 and the first piston 322 move forward rapidly and synchronously. During the movement, the unloading rod 313 pushes the push rod 11 inside the housing 10 forward, while the second piston 332 continues to intake air, which facilitates air compression. At this time, the booster rod 333 on the second piston 332 and the first piston 322 form a huge pressure difference, and the resulting thrust pushes the push rod 11. The push rod 11 is connected to the pull claw 21, and the pull claw 21 also pushes the pull pin 22 forward. As the pull claw 21 (lobes) opens, air enters through the central dust removal port 314 on the end face of the connecting body 31. Since the first piston 322, the second piston 332, the tool unloading rod 313, and the push rod 11 are all on the same axis, the tool unloading rod 313 and the end face of the push rod 11 are in contact and fit together. Exhaust and dust removal are performed along the center of the push rod 11 to the pull stud 22. The tool holder body 23 disengages from the rotating shaft core 13, and is executed to the required position. The tool unloading air inlet 35 is closed, the dust removal air inlet is closed, and the reset air inlet 311 is opened (the reset spring 323 is under long-term load and participates in pushing the first piston 322 and...). The confluence of the tool-unloading push rod 313 prevents insufficient air pressure or other malfunctions from causing the first piston 322 and the second piston 332 to fail to return to their initial positions, resulting in unnecessary damage to the tool-unloading mechanism. At this time, the first piston 322 and the second piston 332 quickly retract to their initial positions. The reaction force of the disc spring 12 pushes back the push rod 11, pulling the pull claw 21 backward. The pull claw 21 (petal claw) retracts and encircles the pull pin 22 of the tool holder body 23, ultimately completing the tool-changing action. This invention uses a mixture of gas compression and liquid pressurization to increase the output power (the cross-sectional area of ​​the pressurizing rod 333 and the first piston 322 can change the pressure inside the pressurizing oil chamber 37, thus obtaining different output thrusts), thereby achieving the thrust required for tool removal and completing the tool-unloading operation.

[0039] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts and rivets that are mature in the existing technology. The internal components of the position sensor adopt conventional models in the existing technology, and their internal structure belongs to the existing technology structure. Workers can complete the normal operation of them according to the existing technical manual. In addition, the circuit connection adopts conventional connection methods in the existing technology, and will not be described in detail here.

[0040] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this utility model patent.

Claims

1. A pneumatic-hydraulic booster automatic tool-changing electric spindle, comprising a spindle (1) and a tool holder assembly (2) disposed on one end face of the spindle (1), wherein a cylinder device (3) is disposed on the other end face of the spindle (1), characterized in that: The cylinder device (3) includes a connecting body (31) disposed on the other end face of the main shaft (1). A first cylinder component (32) is disposed on the end face of the connecting body (31). A second cylinder component (33) is disposed on the end face of the first cylinder component (32). An end cover (34) is disposed on the second cylinder component (33). An unloading air inlet (35) is disposed on the end cover (34). An air intake compression chamber (36) is formed between the second cylinder component (33) and the end cover (34). The unloading air inlet (35) is connected to the air intake compression chamber (36). A booster oil chamber (37) is disposed in the second cylinder component (33).

2. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 1, characterized in that: The connector (31) is provided with a reset air inlet (311) and a cooling interface (312). A tool unloading rod (313) is provided in the axial direction of the connector (31). A central dust removal interface (314) is provided in the axial direction of the tool unloading rod (313). A first reset air inlet channel (315) is provided on the connector (31). The reset air inlet (311) is connected to the first reset air inlet channel (315).

3. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 2, characterized in that: The spindle (1) is provided with a cooling channel (316) that is connected to the cooling interface (312).

4. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 2 or 3, characterized in that: The first cylinder component (32) includes a first cylinder body (321) fixed on the connecting body (31). The first cylinder body (321) is provided with the booster oil chamber (37). The first cylinder body (321) located below the booster oil chamber (37) is provided with a first piston (322). A return spring (323) is sleeved on the first piston (322). The first cylinder body (321) is provided with a second return air intake channel (324) and a third return air intake channel (325). The first return air intake channel (315) and the third return air intake channel (325) are connected through the second return air intake channel (324).

5. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 4, characterized in that: The second cylinder component (33) includes a second cylinder body (331) fixed on the first cylinder body (321), a second piston (332) is provided inside the second cylinder body (331), and a booster rod (333) is provided on the second piston (332), the booster rod (333) moves back and forth in the booster oil chamber (37).

6. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 2, 3, or 5, characterized in that: The main shaft (1) includes a housing (10) fixed to the connecting body (31). An axial hole is provided inside the housing (10), and an axially sliding push rod (11) is installed in the axial hole. The push rod (11) can move forward by being pushed by the tool unloading rod (313). A disc spring (12) is provided on the push rod (11). Inside the housing (10) centered on the push rod (11), from the inside out, are arranged a rotating shaft core (13), a rotor core (14), and a stator core (15). The stator core (15) is provided with a stator winding (16), the front part of the shaft core (13) inside the housing (10) is fitted with a front bearing (17), and the front part of the shaft core (13) inside the housing (10) is fitted with a rear bearing (18). The front end of the push rod (11) is provided with the tool holder assembly (2), and the tool holder assembly (2) passes through the front bearing (17). The housing (10) is provided with a position sensor (19) for sensing the push rod (11).

7. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 6, characterized in that: The front bearing component (17) includes a front bearing (171) disposed on the front part of the rotating shaft core (13) inside the housing (10). A front cover (172) is provided on the front end face of the housing (10) at the end face of the front bearing (171). The front cover (172) is locked to the front end face of the housing (10) by a front lock nut (173).

8. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 7, characterized in that: Two front bearings (171) are used, and a front spacer (174) is provided between the two front bearings (171).

9. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 6, characterized in that: The rear bearing component (18) includes a rear mounting seat (181) disposed on the rear part of the rotating shaft core (13) inside the housing (10), a rear bearing (182) is disposed on the rear mounting seat (181), and a rear cover plate (183) is disposed on the rear mounting seat (181) for pressing the rear bearing (182).

10. The pneumatic-hydraulic booster automatic tool changer electric spindle as described in claim 6, characterized in that: The tool holder assembly (2) includes a pull claw (21) disposed inside the rotating shaft core (13), a pull stud (22) disposed on the pull claw (21), a tool holder body (23) disposed on the pull stud (22), and the tool holder body (23) extending out from the end face of the rotating shaft core (13).

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