A numerical control spindle capable of emergency tool retraction and numerical control machine tool

Abstract

The application discloses a numerical control spindle capable of collecting a tool in an emergency and a numerical control machine tool, and relates to the field of numerical control equipment.The numerical control spindle comprises a shaft core and a tool releasing assembly, the shaft core is provided with a hollow cavity, the tool releasing assembly comprises a telescopic pull rod and a driving part, the telescopic pull rod is movably arranged in the hollow cavity in the axial direction, and the driving part is in transmission connection with the telescopic pull rod; the telescopic pull rod comprises a rod body, a sleeve, a locking piece and a retracting elastic piece, one end of the rod body is connected with a pull claw, the other end of the rod body is arranged in the sleeve and is locked in the sleeve through the locking piece; the retracting elastic piece is arranged in the sleeve in a stretched state, one end of the retracting elastic piece is connected with the rod body, and the other end of the retracting elastic piece is connected with the bottom of the sleeve, so that the rod body is at least partially retracted into the sleeve after the locking piece is unlocked, and then the pull claw is retracted into the hollow cavity. The tool is retracted by the retracting elastic piece, the response is more rapid and direct, and the application is beneficial to being applied to a high-precision numerical control machine tool.

Description

Technical Field

[0001] This invention relates to the field of CNC equipment technology, and in particular to a CNC spindle and CNC machine tool with emergency tool retraction capability. Background Technology

[0002] CNC machine tools, short for numerical control machine tools, are automated machine tools equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions, decode them, represent them with coded numbers, and input them into the CNC device via an information carrier. After processing, the CNC device sends out various control signals to control the machine tool's movements, automatically machining parts according to the shape and dimensions required by the drawings.

[0003] In the actual production process of CNC machine tools, vibration will occur during the contact between the cutting tool and the workpiece. If the cutting tool has small notches or irregular wear, the vibration will be aggravated, which will affect the accuracy of the workpiece during the machining process, reduce the quality of the workpiece and the pass rate, and also inevitably affect the life of the cutting tool, reducing its service life.

[0004] Currently, existing CNC spindles can collect the vibration value of the cutting tool. When the tool vibration exceeds a threshold, the power is cut off to stop the CNC spindle rotation, and the spindle is disengaged from the tool via a leadscrew. However, due to inertia, the tool will still rotate briefly. Furthermore, for high-precision CNC machine tools, the leadscrew moves away from the spindle slowly, making it difficult to quickly disengage the tool, which poses a risk of workpiece damage or severe tool wear. Summary of the Invention

[0005] To address the aforementioned shortcomings, the present invention aims to provide a CNC spindle and CNC machine tool with emergency tool retraction capability.

[0006] To achieve this objective, the present invention adopts the following technical solution: a CNC spindle capable of emergency tool retraction, comprising:

[0007] A shaft core, wherein the shaft core has a hollow cavity extending along the axial direction;

[0008] A pull-out knife assembly includes a telescopic pull rod and a drive unit. The telescopic pull rod is movably disposed in the hollow cavity along the axial direction. The drive unit is pulsatorically connected to the telescopic pull rod to drive the telescopic pull rod to move axially within the hollow cavity.

[0009] The telescopic rod includes a rod body, a sleeve, a locking element, and a retractable elastic element. One end of the rod body is connected to a pull claw, and the other end of the rod body passes through the sleeve and is locked in the sleeve by the locking element. The retractable elastic element is arranged in the sleeve in a stretched state. One end of the retractable elastic element is connected to the rod body, and the other end of the retractable elastic element is connected to the top of the sleeve, so that the rod body retracts at least partially into the sleeve after the locking element is unlocked, thereby causing the pull claw to retract inward in the hollow cavity.

[0010] Furthermore, in the first aspect of the present invention, the telescopic pull rod further includes a cylinder cover, a reset bladder, and a bidirectional pump body. The cylinder cover is disposed on the end of the sleeve away from the pull rod, and the reset bladder is cylindrically disposed inside the sleeve. The cylinder cover has a through hole in the middle, the connector of the reset bladder is fixed to one end of the through hole, and one end of the bidirectional pump body is rotatably connected to the other end of the through hole through a skeleton oil seal.

[0011] Furthermore, in the first aspect of the present invention, a sliding cylinder is also included. The inner wall of the sliding cylinder is provided with a sliding groove. A sliding ring and a sliding seat are spaced apart inside the sliding cylinder. The sliding ring and the sliding seat are connected by a connecting rod. The sliding ring and the sliding seat are slidably fitted in the sliding groove. The inner ring of the sliding ring is connected to the side wall of the cylinder cover through a bearing. The bidirectional pump body is mounted on the sliding seat. The driving part is mounted on the outer side of the end of the sliding cylinder. The telescopic end of the driving part passes through the sliding cylinder and is connected to the sliding seat.

[0012] Furthermore, in the first aspect of the present invention, the inner wall of the sleeve is provided with a retraction stop portion, which is used to abut against one end of the rod that passes through the sleeve. When the rod abuts against the retraction stop portion, the retraction elastic element is still in a stretched state.

[0013] Furthermore, in the first aspect of the present invention, a buffer layer is provided on the side of the retractable stop portion near the rod body.

[0014] Furthermore, in the first aspect of the present invention, the locking member is an electromagnetic pin, which is embedded in the side wall of the sleeve, and the pin body of the electromagnetic pin extends inward in the radial direction to abut against the end of the rod body; the electromagnetic pin is electrically connected to an industrial control computer to lock and unlock the rod body.

[0015] Furthermore, in the first aspect of the present invention, the hollow cavity is provided with a limiting slide and a limiting post. The limiting slide has a connecting hole in the middle. One end of the pull claw passes through the connecting hole and is connected to the pull rod. The outer side wall of the pull claw has a boss. The side wall of the boss near the pull rod abuts against the limiting slide. The limiting slide has a limiting hole that slides with the limiting post.

[0016] Furthermore, in the first aspect of the present invention, the retractable elastic element is a spring, and the end of the pull rod inserted into the sleeve and the inner side wall of the sleeve cover are respectively provided with limiting ring platforms; the two ends of the retractable elastic element are respectively sleeved on the side wall of the limiting ring platform on the same side.

[0017] The second aspect of the present invention discloses a CNC machine tool, including a CNC spindle capable of emergency retraction as disclosed in any of the first aspects of the present invention.

[0018] The technical solution provided by this invention may include the following beneficial effects:

[0019] In an embodiment of the present invention, when the CNC spindle is assembling a cutting tool, the drive unit extends the telescopic rod, causing the telescopic rod to push the pull jaws out of the hollow cavity, thus opening the pull jaws. Then, the tool shank is inserted into the pull jaws. Finally, the drive unit pulls back the telescopic rod, causing the telescopic rod to pull the pull jaws back into the hollow cavity, thus closing the pull jaws and completing the tool assembly onto the CNC spindle. When the CNC spindle is removing the cutting tool, the drive unit extends the telescopic rod, causing the telescopic rod to push the pull jaws out of the hollow cavity, thus opening the pull jaws and releasing the tool shank. Finally, the drive unit pulls back the telescopic rod, causing the telescopic rod to pull the pull jaws back into the hollow cavity, thus closing the pull jaws and completing the tool disassembly.

[0020] In practical applications, when the vibration of the cutting tool exceeds a threshold, the locking mechanism unlocks the rod, allowing it to move axially. Once unlocked, the stretched elastic element immediately releases its elastic potential energy, pulling the rod inward axially. This allows more of the rod to be inserted into the sleeve, simultaneously pulling the pull claw and the cutting tool mounted on it into the hollow cavity, achieving rapid tool retraction. Thus, even if the spindle rotates briefly due to inertia, the cutting tool can quickly retract into the hollow cavity, enabling rapid tool separation from the workpiece and effectively preventing workpiece damage or severe tool wear.

[0021] It is worth noting that, compared to the method of moving the CNC spindle via a lead screw to disengage the tool from the workpiece, this application uses a retractable elastic element to retract the tool, which provides a faster and more direct response and is more suitable for use on high-precision CNC machine tools. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of a CNC spindle according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the telescopic tie rod of a CNC spindle according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the spindle core of a CNC spindle according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the slide cylinder of a CNC spindle according to an embodiment of the present invention;

[0026] Figure 5 yes Figure 2 A magnified schematic diagram of the structure of region A in the middle.

[0027] In the attached diagram: 100-shoulder sleeve, 200-shaft core, 210-hollow cavity, 211-limiting slide plate, 212-limiting post, 220-stator, 230-rotor, 300-pulling knife assembly, 310-telescopic pull rod, 311-rod body, 312-sleeve, 3121-retractable stop part, 313-locking part, 314-retractable elastic part, 315-cylinder cover, 3151-through hole, 316-reset bladder, 317-bidirectional pump body, 318-limiting ring platform, 320-drive part, 400-pulling claw, 500-slide cylinder, 510-slide groove, 520-slip ring, 530-slide seat, 540-connecting rod. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0031] Reference Figure 1 and Figure 3 As shown, the first aspect of the present invention discloses a CNC spindle with emergency tool retraction capability, comprising:

[0032] Bushing 100;

[0033] A shaft core 200 is rotatably disposed within the bushing 100 via a bearing. The shaft core 200 has an axially extending hollow cavity 210. A motor is sleeved on the outer periphery of the shaft core 200. The motor includes a stator 220 and a rotor 230 sleeved on the inner periphery of the stator 220. The rotor 230 is fixedly sleeved on the shaft core 200 so as to drive the shaft core 200 to rotate.

[0034] A pull-out knife assembly 300 includes a telescopic pull rod 310 and a drive unit 320. The telescopic pull rod 310 is movably disposed in the hollow cavity 210 along the axial direction. The drive unit 320 is pultrusively connected to the telescopic pull rod 310 to drive the telescopic pull rod 310 to move axially within the hollow cavity 210.

[0035] The telescopic rod 310 includes a rod body 311, a sleeve 312, a locking member 313, and a retractable elastic member 314. One end of the rod body 311 is connected to the pull claw 400, and the other end of the rod body 311 passes through the sleeve 312 and is locked in the sleeve 312 by the locking member 313. The retractable elastic member 314 is arranged in a stretched state in the sleeve 312. One end of the retractable elastic member 314 is connected to the rod body 311, and the other end of the retractable elastic member 314 is connected to the top of the sleeve 312, so that the rod body 311 is at least partially retracted into the sleeve 312 after the locking member 313 is unlocked, thereby causing the pull claw 400 to retract inward in the hollow cavity 210.

[0036] In an embodiment of the present invention, when the CNC spindle is assembling a cutting tool, the drive unit 320 extends the telescopic rod 310, causing the telescopic rod 310 to push the pull jaw 400 out of the hollow cavity 210, thus opening the pull jaw 400. Then, the tool shank is inserted into the pull jaw 400. Finally, the drive unit 320 pulls back the telescopic rod 310, causing the telescopic rod 310 to pull the pull jaw 400 back into the hollow cavity 210, thus closing the pull jaw 400 and completing the assembly of the cutting tool onto the CNC spindle. When the CNC spindle removes the tool, the drive unit 320 extends the telescopic rod 310, which pushes the pull claw 400 out of the hollow cavity 210, thus opening the pull claw 400 and releasing the tool holder. Finally, the drive unit 320 pulls back the telescopic rod 310, which pulls the pull claw 400 back into the hollow cavity 210, thus closing the pull claw 400 and completing the tool removal.

[0037] In practical applications, when the vibration of the cutting tool exceeds a threshold, the locking element 313 unlocks the rod 311, allowing it to move axially. After unlocking, the retractable elastic element 314, which is in a stretched state, immediately releases its elastic potential energy, pulling the rod 311 inwards axially. This allows more of the rod 311 to be inserted into the sleeve 312, simultaneously pulling the pull claw 400 and the cutting tool mounted on it into the hollow cavity 210, achieving rapid tool retraction. Thus, even if the spindle 200 rotates briefly due to inertia, the cutting tool can quickly retract into the hollow cavity 210, enabling rapid tool detachment from the workpiece and effectively preventing workpiece damage or severe tool wear.

[0038] It is worth noting that, compared to the method of moving the CNC spindle via a lead screw to disengage the tool from the workpiece, this application uses the retraction elastic element 314 to retract the tool, which provides a faster and more direct response and is more suitable for use on high-precision CNC machine tools.

[0039] like Figure 2 and Figure 5 As shown, in a preferred embodiment of the present invention, the telescopic pull rod 310 further includes a sleeve cover 315, a reset bladder 316, and a bidirectional pump body 317. The sleeve cover 315 covers the end of the sleeve 312 away from the pull rod, and the reset bladder 316 is cylindrically disposed inside the sleeve 312. The sleeve cover 315 has a through hole 3151 in the middle, and the connector of the reset bladder 316 is fixed to one end of the through hole 3151. One end of the bidirectional pump body 317 is rotatably connected to the other end of the through hole 3151 through a skeleton oil seal.

[0040] In this embodiment, fluid is pumped into the reset capsule 316 by the bidirectional pump body 317, causing the cylindrical reset capsule 316 to expand and retract the pull rod to the end of the sleeve 312. Then, the rod body 311 is locked by the locking member 313. In this way, the telescopic pull rod 310 is reset, allowing the tool to extend out of the hollow cavity 210 for disassembly and replacement. It is worth noting that after the locking member 313 locks the rod body 311, the bidirectional pump body 317 pumps fluid out of the reset capsule 316, causing the cylindrical reset capsule 316 to contract. This is to prevent excessive fluid in the reset capsule 316 from hindering the rapid retraction of the retraction elastic member 314 and the rod body 311. Specifically, the bidirectional pump body 317 can be a bidirectional air pump, which can expand the reset capsule 316 by pumping gas into it and contract the reset capsule 316 by pumping gas out of it.

[0041] It is worth noting that the cap 315 is placed on the end of the sleeve 312 away from the pull rod, and the reset bladder 316 is disposed inside the sleeve 312; the cap 315 has a through hole 3151 in the middle, the connector of the reset bladder 316 is fixed to one end of the through hole 3151, and one end of the bidirectional pump body 317 is rotatably connected to the other end of the through hole 3151 via a bearing. In this way, the rod 311, sleeve 312, cap 315 and reset bladder 316 all rotate with the shaft 200, while the bidirectional pump body 317 does not need to rotate with the shaft 200, which can reduce the load on the shaft 200.

[0042] More specifically, the CNC spindle provided by the present invention also includes a slide cylinder 500, the inner wall of which is provided with a slide groove 510, a slide ring 520 and a slide seat 530 are spaced apart inside the slide cylinder 500, the slide ring 520 and the slide seat 530 are connected by a connecting rod 540, the slide ring 520 and the slide seat 530 are slidably fitted in the slide groove 510, the inner ring of the slide ring 520 is connected to the side wall of the cylinder cover 315 through a bearing, the bidirectional pump body 317 is mounted on the slide seat 530, the drive unit 320 is mounted on the outer side of the end of the slide cylinder 500, and the telescopic end of the drive unit 320 passes through the slide cylinder 500 and is connected to the slide seat 530.

[0043] Specifically, such as Figure 4 As shown, the cylinder cover 315 is located outside the shaft core 200. The inner ring of the slip ring 520 is connected to the side wall of the cylinder cover 315 through a bearing, so that the cylinder cover 315 can rotate relative to the slide cylinder 500. In this embodiment, when the CNC spindle is equipped with a tool, the drive unit 320 axially pushes the slide block 530. Due to the action of the connecting rod 540, the slip ring 520 is pushed to move synchronously, so that the bidirectional pump body 317, cylinder cover 315, sleeve 312, connecting rod 540, retraction elastic element 314, and reset bladder 316 are pushed outward synchronously. That is, the telescopic pull rod 310 is pushed outward as a whole, pushing the pull claw 400 out of the hollow cavity 210, so that the pull claw 400 opens. Then, the tool holder is inserted into the pull jaw 400. Finally, the drive unit 320 axially pulls back the slide 530, causing the telescopic rod 310 to retract as a whole, thus pulling the pull jaw 400 back into the hollow cavity 210, thereby closing the pull jaw 400 and completing the tool assembly onto the CNC spindle. The drive unit 320 can be either a pneumatic cylinder or a hydraulic cylinder.

[0044] Preferably, the inner wall of the sleeve 312 is provided with a retraction stop portion 3121, which is used to abut against the end of the rod 311 that penetrates the sleeve 312. When the rod 311 abuts against the retraction stop portion 3121, the retraction elastic member 314 remains in a stretched state. In this embodiment, when the rod 311 retracts and abuts against the retraction stop portion 3121, the tool has been completely retracted into the hollow cavity 210, and the retraction elastic member 314 remains in a stretched state. In this way, the retraction elastic member 314 will not spring back and push out the rod 311, which can prevent the rod 311 from springing back and causing the tool to be exposed outside the shaft core 200 again, ensuring that the tool is quickly retracted.

[0045] More preferably, the retractable stop portion 3121 has a buffer layer on the side near the rod body 311. Thus, by providing the buffer layer, rigid collision between the rod body 311 and the retractable stop portion 3121 can be effectively avoided. Specifically, the buffer layer can be a rubber washer.

[0046] The locking component 313 includes an electrical control unit and a locking part. The electrical control unit is signal-connected to the control system of the CNC machine tool. Upon receiving a signal, the electrical control unit correspondingly pushes the locking part out of the locking rod 311 or pulls back the locking part to unlock the locking rod 311. Optionally, the locking component 313 is an electromagnetic pin. The electromagnetic pin is embedded in the side wall of the sleeve 312, and the pin body of the electromagnetic pin extends inward in the radial direction to abut against the end of the rod 311. The electromagnetic pin is electrically connected to an industrial control computer to lock and unlock the rod 311.

[0047] Preferably, the hollow cavity 210 is provided with a limiting slide 211 and a limiting post 212. The limiting slide 211 has a connecting hole in the middle. One end of the pull claw 400 passes through the connecting hole and is connected to the pull rod. The outer side wall of the pull claw 400 has a boss. The side wall of the boss near the pull rod abuts against the limiting slide 211. The limiting slide 211 has a limiting hole that slides with the limiting post 212.

[0048] In this embodiment, the movement of the pull claw 400 within the hollow cavity 210 is limited by the cooperation of the limiting post 212 and the limiting slide 211, which can ensure the stability of the movement of the pull claw 400, reduce the offset of the pull claw 400, and ensure that the tool moves in the axial direction to avoid the tool scraping against the hollow cavity 210.

[0049] Preferably, the retractable elastic element 314 is a spring, and the end of the pull rod inserted into the sleeve 312 and the inner side wall of the sleeve cover 315 are respectively provided with limiting ring platform 318; the two ends of the retractable elastic element 314 are respectively sleeved on the side wall of the limiting ring platform 318 on the same side.

[0050] In this embodiment, limiting ring platforms 318 are provided at the end of the pull rod insertion sleeve 312 and on the inner side wall of the sleeve cover 315, so as to facilitate the positioning and assembly of the end of the retractable elastic member 314.

[0051] The second aspect of the present invention discloses a CNC machine tool, including a CNC spindle with emergency retraction capability as described in any embodiment of the first aspect of the present invention.

[0052] In the CNC machine tool provided by this invention, when the CNC spindle is equipped with a cutting tool, the drive unit 320 extends the telescopic rod 310, causing the telescopic rod 310 to push the pull jaw 400 out of the hollow cavity 210, thus opening the pull jaw 400. Then, the tool holder is inserted into the pull jaw 400, and finally, the drive unit 320 pulls back the telescopic rod 310, causing the telescopic rod 310 to pull the pull jaw 400 back into the hollow cavity 210, thus closing the pull jaw 400 and completing the assembly of the cutting tool onto the CNC spindle. When the CNC spindle removes the tool, the drive unit 320 extends the telescopic rod 310, which pushes the pull claw 400 out of the hollow cavity 210, thus opening the pull claw 400 and releasing the tool holder. Finally, the drive unit 320 pulls back the telescopic rod 310, which pulls the pull claw 400 back into the hollow cavity 210, thus closing the pull claw 400 and completing the tool removal.

[0053] In practical applications, when the vibration of the cutting tool exceeds a threshold, the locking element 313 unlocks the rod 311, allowing it to move axially. After unlocking, the retractable elastic element 314, which is in a stretched state, immediately releases its elastic potential energy, pulling the rod 311 inwards axially. This allows more of the rod 311 to be inserted into the sleeve 312, simultaneously pulling the pull claw 400 and the cutting tool mounted on it into the hollow cavity 210, achieving rapid tool retraction. Thus, even when the spindle 200 rotates briefly due to inertia, the cutting tool can quickly retract into the hollow cavity 210, enabling rapid tool detachment from the workpiece and effectively preventing workpiece damage or severe tool wear.

[0054] It is worth noting that, compared to the method of moving the CNC spindle via a lead screw to disengage the tool from the workpiece, this application uses the retraction elastic element 314 to retract the tool, which provides a faster and more direct response and is more suitable for use on high-precision CNC machine tools.

[0055] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A CNC spindle with emergency tool retraction capability, characterized in that, include: A shaft core, wherein the shaft core has a hollow cavity extending along the axial direction; A pull-out knife assembly includes a telescopic pull rod and a drive unit. The telescopic pull rod is movably disposed in the hollow cavity along the axial direction. The drive unit is pulsatorically connected to the telescopic pull rod to drive the telescopic pull rod to move axially within the hollow cavity. The telescopic rod includes a rod body, a sleeve, a locking element, and a retractable elastic element. One end of the rod body is connected to a pull claw, and the other end of the rod body passes through the sleeve and is locked in the sleeve by the locking element. The retractable elastic element is arranged in the sleeve in a stretched state. One end of the retractable elastic element is connected to the rod body, and the other end of the retractable elastic element is connected to the top of the sleeve, so that the rod body retracts at least partially into the sleeve after the locking element is unlocked, thereby causing the pull claw to retract inward in the hollow cavity.

2. A CNC spindle with emergency tool retraction capability according to claim 1, characterized in that: The telescopic pull rod also includes a cylinder cover, a reset bladder, and a bidirectional pump body. The cylinder cover is located at the end of the sleeve away from the pull rod, and the reset bladder is cylindrically disposed inside the sleeve. The cylinder cover has a through hole in the middle, the connector of the reset bladder is fixed to one end of the through hole, and one end of the bidirectional pump body is rotatably connected to the other end of the through hole through a skeleton oil seal.

3. A CNC spindle with emergency tool retraction capability according to claim 2, characterized in that: It also includes a slide cylinder, the inner wall of which is provided with a slide groove. A slide ring and a slide seat are spaced apart inside the slide cylinder. The slide ring and the slide seat are connected by a connecting rod. The slide ring and the slide seat are slidably fitted in the slide groove. The inner ring of the slide ring is connected to the side wall of the cylinder cover through a bearing. The bidirectional pump body is mounted on the slide seat. The drive unit is mounted on the outer side of the end of the slide cylinder. The telescopic end of the drive unit passes through the slide cylinder and is connected to the slide seat.

4. A CNC spindle with emergency tool retraction capability according to claim 1, characterized in that: The inner wall of the sleeve is provided with a retraction stop portion, which is used to abut against one end of the rod that passes through the sleeve. When the rod abuts against the retraction stop portion, the retraction elastic element is still in a stretched state.

5. A CNC spindle with emergency tool retraction capability according to claim 4, characterized in that: The retractable stop section has a buffer layer on the side near the rod.

6. A CNC spindle with emergency tool retraction capability according to claim 1, characterized in that: The locking element is an electromagnetic pin, which is embedded in the side wall of the sleeve. The pin body of the electromagnetic pin extends inward in the radial direction to abut against the end of the rod body. The electromagnetic pin is electrically connected to an industrial control computer to lock and unlock the rod body.

7. A CNC spindle with emergency tool retraction capability according to claim 1, characterized in that: The hollow cavity is provided with a limiting slide and a limiting post. The limiting slide has a connecting hole in the middle. One end of the pull claw passes through the connecting hole and is connected to the pull rod. The outer side wall of the pull claw has a boss. The side wall of the boss near the pull rod abuts against the limiting slide. The limiting slide is provided with a limiting hole that slides with the limiting post.

8. A CNC spindle with emergency tool retraction capability according to claim 2, characterized in that: The retractable elastic element is a spring, and the end of the pull rod inserted into the sleeve and the inner side wall of the sleeve cover are respectively provided with limiting ring platforms; the two ends of the retractable elastic element are respectively sleeved on the side wall of the limiting ring platform on the same side.

9. A CNC machine tool, characterized in that, Including the CNC spindle with emergency retraction capability as described in any one of claims 1-8.

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