An adjustable motorized spindle

Abstract

The application discloses an adjustable electric spindle and relates to the field of electric spindles, which solves the problem that the outer diameter size and length of an output shaft are difficult to adjust and adapt to different operating members for driving in use of the existing adjustable electric spindle. The adjustable electric spindle comprises a shell, a telescopic mechanism, an adjusting mechanism and a connecting mechanism. A driving shaft is rotationally connected in the shell. One end of the driving shaft is fixedly connected with a connecting pipe. The telescopic mechanism comprises a fixed pipe, a sleeving pipe and an output shaft. The adjusting mechanism comprises multiple sets of opening and closing plates. The connecting mechanism comprises driving teeth. The adjustable electric spindle is convenient for adjusting the position of the sleeving pipe relative to the fixed pipe, thereby changing the length of the output shaft. When the driving shaft rotates forward, the opening and closing plates are driven to open to a required position, the operating member is driven to be fixed and rotationally operated. When the driving shaft reversely rotates, the opening and closing plates are driven to be attached to the outer wall of the output shaft, the driving state is released, the operating member is supported and fixed through the connecting mechanism, and the operating member is driven to rotationally operate.

Description

Technical Field

[0001] This invention relates to the field of electric spindle technology, specifically to an adjustable electric spindle. Background Technology

[0002] With the rapid development and increasing sophistication of electric drive technology (variable frequency speed regulation technology, electric motor vector control technology, etc.), the mechanical structure of the main drive system of high-speed CNC machine tools has been greatly simplified, basically eliminating belt drive and gear drive. The machine tool spindle is directly driven by an internal electric motor. The electric spindle is a new technology that integrates the machine tool spindle and the spindle motor in the field of CNC machine tools.

[0003] Existing electric spindles, with their fixed length and outer diameter after being fixedly connected to the drive motor rotor, cannot be adjusted. When the spindle length and outer diameter cannot meet production requirements, it is necessary to replace them with spindles of different lengths and outer diameters for adaptation, which greatly reduces operational efficiency and increases production costs. To address this, we propose an adjustable electric spindle. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable electric spindle that allows for flexible adjustment and adaptation of the outer diameter and length of the output shaft, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable electric spindle, comprising a housing, a telescopic mechanism, an adjusting mechanism, and a connecting mechanism. A drive shaft is rotatably connected within the housing, and one end of the drive shaft is fixedly connected to a connecting pipe. The telescopic mechanism includes a fixed pipe fixedly installed at one end of the connecting pipe. A sleeve is slidably connected to the outer wall of the fixed pipe, and one end of the sleeve is fixedly connected to an output shaft for adjusting the position of the sleeve relative to the fixed pipe, thereby changing the length of the output shaft. The adjusting mechanism includes multiple sets of components installed on the outer wall of the output shaft. The opening and closing plates, multiple sets of which can be combined into a ring shape to fit against the outer wall of the output shaft, are used to open the opening and closing plates to the desired position when the drive shaft rotates in the forward direction, thereby fixing and rotating the operating component. When the drive shaft rotates in the reverse direction, the opening and closing plates are driven to fit against the outer wall of the output shaft, releasing the drive state. The connecting mechanism includes multiple sets of drive teeth mounted on the opening and closing plates, which are used to support and fix the operating component, and drive the operating component to rotate through the drive teeth, facilitating flexible adjustment and adaptation of the outer diameter and length of the output shaft.

[0006] Preferably, the adjustment mechanism further includes a first sliding frame and a second sliding frame slidably connected to the inner wall of the output shaft. Both the first and second sliding frames are rotatably connected to a connecting rod rotatably connected to the opening and closing plate. Multiple sets of adjustment grooves are evenly provided on the side of the output shaft, slidingly engaging with the outer wall of the connecting rod. A first spring is fixedly connected between the first and second sliding frames. The output shaft contains a sliding member for synchronously driving the first and second sliding frames to slide, facilitating the opening and closing plate to open to the desired position and fix and rotate the operating component when the drive shaft rotates in the forward direction. When the drive shaft rotates in the reverse direction, the opening and closing plate is brought into contact with the outer wall of the output shaft, releasing the driving state.

[0007] Preferably, the sliding component includes a sliding tube fixedly installed on the side of the first sliding frame and the second sliding frame. The sliding tube is slidably fitted against the inner wall of the output shaft. One end of the output shaft is connected to the sleeve tube. A connecting frame is fixedly connected inside the sleeve tube. A conveying tube is fixedly connected to the connecting frame. The conveying tube passes through the first sliding frame and the second sliding frame and is slidably fitted against the inner walls of the first sliding frame and the second sliding frame. One end of the conveying tube is connected to the sleeve tube, and the other end is connected to the sliding tube on the side of the first sliding frame. The connecting tube is provided with a control component for controlling the pressure inside the sliding tubes on both sides, so as to synchronously drive the first sliding frame and the second sliding frame to slide.

[0008] Preferably, the control component includes a fixed shaft fixedly installed inside the housing, the fixed shaft passing through the drive shaft and the connecting pipe, and rotatably connected to the inner wall of the drive shaft, the sleeve pipe for storing hydraulic oil, a push plate slidably connected to the inner wall of the connecting pipe, the fixed shaft passing through the push plate and movably sleeved with the inner wall of the push plate, and the push plate being provided with a drive component for changing the moving direction of the push plate when the connecting pipe drives the push plate to rotate, so as to facilitate control of the pressure in the sliding pipes on both sides.

[0009] Preferably, the driving component includes a driving block fixedly installed on the inner wall of the push plate. The outer wall of the fixed shaft is provided with a first annular groove, a second annular groove, and a threaded groove that can be slidably connected with the driving block. The two ends of the threaded groove are respectively connected to the first annular groove and the second annular groove. A second spring fixedly connected to the drive shaft is fixedly connected to one side of the push plate. A sealing tube that slidably fits against the outer wall of the fixed shaft is fixedly connected to the side of the push plate away from the second spring, so as to change the moving direction of the push plate when the connecting tube drives the push plate to rotate.

[0010] Preferably, the adjustment mechanism further includes a guide plate and a guide block fixedly installed at both ends of the opening and closing plate. The side of the output shaft is provided with a guide groove that is slidably connected to the guide plate. The guide block is slidably connected to one end of the sleeve tube, which facilitates limiting and guiding the sliding of the opening and closing plate.

[0011] Preferably, the telescopic mechanism further includes a rotating shaft rotatably connected to the housing, a drive gear is coaxially fixedly connected to the rotating shaft, and multiple sets of annular tooth blocks meshing with the drive gear are uniformly fixedly connected to the outer wall of the sleeve. The rotating shaft is provided with a limiting member for automatically limiting the rotating shaft during the adjustment process, so as to facilitate the adjustment of the position of the sleeve relative to the fixed tube, thereby changing the length of the output shaft.

[0012] Preferably, the connecting mechanism further includes an internal gear ring fixedly installed on the inner wall of the operating component. The internal gear ring can mesh with the drive teeth to facilitate the support and fixation of the operating component, and drive the operating component to rotate through the drive teeth.

[0013] Preferably, the limiting component includes a worm gear coaxially fixedly mounted on the rotating shaft, and a worm gear meshing with the worm gear is rotatably connected to the housing, which facilitates automatic limiting of the rotating shaft during adjustment.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention provides an adjustable electric spindle that solves the problem of difficulty in adjusting the outer diameter and length of the output shaft to adapt to different operating components when using existing adjustable electric spindles. It allows for easy adjustment of the output shaft length by changing the position of the sleeve relative to the fixed tube. When the drive shaft rotates forward, it drives the opening plate to open to the desired position, fixing and rotating the operating component. When the drive shaft rotates in the reverse direction, it drives the opening plate to conform to the outer wall of the output shaft, releasing the drive state. The operating component is then supported and fixed by the connecting mechanism and driven to rotate. This device has a strong overall structure, is convenient and efficient to operate, can flexibly adjust the extension length of the output shaft and automatically limit its movement, and can automatically support and fix the inner wall of the operating component during operation, completing the adaptation drive operation, improving loading and unloading efficiency, and effectively increasing production and processing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a partial structural diagram of the connecting mechanism of the present invention;

[0018] Figure 3 for Figure 2Enlarged view of region A in the middle;

[0019] Figure 4 This is a partial structural diagram of the telescopic mechanism of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of region B in the middle;

[0021] Figure 6 This is a partial structural diagram of the adjustment mechanism of the present invention;

[0022] Figure 7 This is a partial structural diagram of the sliding component of the present invention;

[0023] Figure 8 for Figure 7 Enlarged view of region C;

[0024] Figure 9 for Figure 7 Enlarged view of region D in the middle;

[0025] Figure 10 This is a partial structural cross-sectional view of the adjustment mechanism of the present invention.

[0026] In the diagram: 1-Housing; 2-Drive shaft; 3-Connecting pipe; 4-Telescopic mechanism; 5-Fixing pipe; 6-Sleeve pipe; 7-Output shaft; 8-Adjusting mechanism; 9-Opening and closing plate; 10-Connecting mechanism; 11-Drive gear; 12-First sliding frame; 13-Second sliding frame; 14-Connecting rod; 15-Adjusting groove; 16-First spring; 17-Sliding component; 18-Sliding pipe; 19-Connecting frame; 20-Conveying pipe; 21-Control Components; 22-Fixed shaft; 23-Push plate; 24-Drive component; 25-Drive block; 26-First annular groove; 27-Second annular groove; 28-Threaded groove; 29-Second spring; 30-Sealing tube; 31-Guide plate; 32-Guide block; 33-Guide groove; 34-Rotating shaft; 35-Drive gear; 36-Annular tooth block; 37-Limiting component; 38-Internal tooth ring; 39-Worm gear; 40-Worm; 41-Operating component. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] Please see Figures 1-10The diagram shows an adjustable electric spindle, comprising a housing 1, a telescopic mechanism 4, an adjusting mechanism 8, and a connecting mechanism 10. A drive shaft 2 is rotatably connected inside the housing 1, and a connecting pipe 3 is fixedly connected to one end of the drive shaft 2. The telescopic mechanism 4 includes a fixed pipe 5 fixedly installed at one end of the connecting pipe 3. A sleeve pipe 6 is slidably connected to the outer wall of the fixed pipe 5, and an output shaft 7 is fixedly connected to one end of the sleeve pipe 6. The sleeve pipe 6 is used to adjust the position of the sleeve pipe 6 relative to the fixed pipe 5, thereby changing the length of the output shaft 7. The adjusting mechanism 8 includes multiple sets of opening and closing plates 9 installed on the outer wall of the output shaft 7. These multiple sets of opening and closing plates 9 can be combined into a ring shape. The outer wall of the output shaft 7 is in contact with the drive shaft 2, which is used to drive the opening and closing plate 9 to open to the required position when the drive shaft 2 rotates in the forward direction, so as to fix and rotate the operating member 41. When the drive shaft 2 rotates in the reverse direction, the opening and closing plate 9 is driven to fit against the outer wall of the output shaft 7, and the drive state is released. The connecting mechanism 10 includes multiple sets of drive teeth 11 installed on the opening and closing plate 9. The connecting mechanism 10 also includes an inner toothed ring 38 fixedly installed on the inner wall of the operating member 41. The inner toothed ring 38 can mesh and engage with the drive teeth 11 to support and fix the operating member 41, and drive the operating member 41 to rotate through the drive teeth 11.

[0030] The adjustment mechanism 8 also includes a first sliding frame 12 and a second sliding frame 13 that are slidably connected to the inner wall of the output shaft 7. Both the first sliding frame 12 and the second sliding frame 13 are rotatably connected to a connecting rod 14 that is rotatably connected to the opening and closing plate 9. Multiple sets of adjustment grooves 15 that are slidably fitted to the outer wall of the connecting rod 14 are evenly opened on the side of the output shaft 7. A first spring 16 is fixedly connected between the first sliding frame 12 and the second sliding frame 13. The output shaft 7 is provided with a sliding member 17 for synchronously driving the first sliding frame 12 and the second sliding frame 13 to slide. The adjustment mechanism 8 also includes a guide plate 31 and a guide block 32 that are fixedly installed at both ends of the opening and closing plate 9. A guide groove 33 that is slidably connected to the guide plate 31 is opened on the side of the output shaft 7. The guide block 32 is slidably connected to one end of the sleeve 6.

[0031] The sliding component 17 includes a sliding tube 18 fixedly installed on the side of the first sliding frame 12 and the second sliding frame 13. The sliding tube 18 slides against the inner wall of the output shaft 7. One end of the output shaft 7 is connected to the sleeve 6. A connecting frame 19 is fixedly connected inside the sleeve 6. A conveying pipe 20 is fixedly connected to the connecting frame 19. The conveying pipe 20 passes through the first sliding frame 12 and the second sliding frame 13 and slides against the inner wall of the first sliding frame 12 and the second sliding frame 13. One end of the conveying pipe 20 is connected to the sleeve 6, and the other end is connected to the sliding tube 18 on the side of the first sliding frame 12. A control component 21 for controlling the pressure inside the two sliding tubes 18 is provided inside the connecting pipe 3.

[0032] The control component 21 includes a fixed shaft 22 fixedly installed in the housing 1. The fixed shaft 22 passes through the drive shaft 2 and the connecting pipe 3 and is rotatably connected to the inner wall of the drive shaft 2. The sleeve pipe 6 is used to store hydraulic oil. The inner wall of the connecting pipe 3 is slidably connected to a push plate 23. The fixed shaft 22 passes through the push plate 23 and is movably sleeved with the inner wall of the push plate 23. The push plate 23 is provided with a drive component 24 for changing the moving direction of the push plate 23 when the connecting pipe 3 drives the push plate 23 to rotate.

[0033] The driving component 24 includes a driving block 25 fixedly installed on the inner wall of the push plate 23. The outer wall of the fixed shaft 22 is provided with a first annular groove 26, a second annular groove 27 and a threaded groove 28 that can slide and connect with the driving block 25. The two ends of the threaded groove 28 are respectively connected to the first annular groove 26 and the second annular groove 27. A second spring 29 fixedly connected to the drive shaft 2 is fixedly connected to one side of the push plate 23. A sealing tube 30 that slides and fits against the outer wall of the fixed shaft 22 is fixedly connected to the side of the push plate 23 away from the second spring 29.

[0034] This implementation plan stipulates that the appendix Figure 7 In the left view, the connecting pipe 3 drives the push plate 23 to rotate counterclockwise for forward rotation and clockwise for reverse rotation. When the drive shaft 2 drives the connecting shaft to rotate forward, the push plate 23 is pushed by the second spring 29 during rotation. The drive block 25 gradually slides from the second annular groove 27 into the threaded groove 28 until it slides into the first annular groove 26. At this time, the push plate 23 reaches the maximum displacement, and the second spring 29 is in a stretched state. At this time, the push plate 23 will push the hydraulic oil in the connecting pipe 3 and the sleeve pipe 6 towards the inner wall of the output shaft 7 and deliver it to the sliding pipes 18 on both sides through the delivery pipe 20. The sliding pipes 18 on both sides are subjected to the same thrust, so that the first sliding frame 12 and the second sliding frame 13 slide towards each other, compressing the first spring 16 and causing the connecting rods 14 on both sides to push the opening and closing plate 9 to open in all directions. The guide plate 31 slides in the guide groove 33, and the guide block 32 slides and guides at one end of the sleeve pipe 6, so that the opening and closing plate 9 is horizontal and evenly away from the output shaft 7 to open.

[0035] It is worth noting that when installing the operating component 41, the telescopic mechanism 4 is first adjusted so that the sleeve 6 slides on the outer wall of the fixed tube 5, driving the output shaft 7 to slide to the required position and insert it into the installation cavity of the operating component 41. The installation cavity is provided with an internal toothed ring 38, which can open to all sides through the opening and closing plate 9 when the output shaft 7 rotates. The internal toothed ring 38 is automatically engaged by the drive teeth 11 and drives the operating component 41 to rotate. Since the outer diameter range that the opening and closing plate 9 can adjust is small, the change in the curvature of the outer wall is small and does not affect the engagement and drive of the drive teeth 11 and the internal toothed ring 38.

[0036] It should be noted that: since the cavity volume between the first annular groove 26 and the second annular groove 27 is much larger than the volume inside the sleeve 6, when the push plate 23 slides from the second annular groove 27 into the first annular groove 26, it will compress the hydraulic oil pressure to a greater strength, ensuring that no matter where the sleeve 6 slides, the first sliding frame 12 and the second sliding frame 13 can be pushed to their limit positions, ensuring that the opening and closing plate 9 can tightly abut and clamp the inner wall of the operating member 41, and can always block the adjusting groove 15 during the sliding process of the sliding tube 18, preventing the internal hydraulic oil from leaking to the outside through the adjusting groove 15.

[0037] After the operation is completed, the control drive shaft 2 rotates in the reverse direction. At this time, the connecting pipe 3 drives the push plate 23 to rotate in the reverse direction relative to the fixed shaft 22. Under the pull of the second spring 29, the push plate 23 gradually slides from the first annular groove 26 into the threaded groove 28, and finally slides into the second sliding groove to rotate continuously and complete the reset. At the same time, the hydraulic oil in the output shaft 7 is drawn into the connecting pipe 3 to reduce the hydraulic pressure in the output shaft 7 and the delivery pipe 20. At this time, the first spring 16 rebounds and resets, pushing the first sliding frame 12 and the second sliding frame 13 to both sides, driving the connecting rod 14 to make the opening and closing plate 9 slide synchronously towards the outer wall of the output shaft 7 and fit together, completing the retraction and reset of the opening and closing plate 9, which is convenient for clamping and driving the subsequent replacement operating part 41.

[0038] Example 2

[0039] Please see Figures 1-10 Example 2 is described below. This example further illustrates Example 1. The telescopic mechanism 4 shown in the figure also includes a rotating shaft 34 rotatably connected to the housing 1. A drive gear 35 is coaxially fixedly connected to the rotating shaft 34. Multiple sets of annular tooth blocks 36 that mesh with the drive gear 35 are uniformly fixedly connected to the outer wall of the sleeve 6. The rotating shaft 34 is provided with a limiting member 37 for automatically limiting the rotating shaft 34 during the adjustment process. The limiting member 37 includes a worm gear 39 coaxially fixedly installed on the rotating shaft 34. A worm 40 that meshes with the worm gear 39 is rotatably connected to the housing 1.

[0040] In this embodiment, rotating the worm gear 40 drives the worm wheel 39 to rotate, which in turn drives the drive gear 35 to rotate. The drive gear 35 drives the annular tooth block 36 and the sleeve 6 to perform horizontal sliding adjustment, changing the extension length of the sleeve 6 relative to the fixed tube 5, thereby adjusting the extension length of the output shaft 7. Since the sleeve 6 rotates relative to the housing 1 during operation, the design of the annular tooth block 36 ensures that the drive gear 35 is always engaged during the rotation of the sleeve 6. At the same time, since the worm gear 40 has an automatic limiting function for the worm wheel 39, there is no need to set up an additional limiting structure. The rotation and limiting of the rotating shaft 34 can be achieved simply by rotating the worm gear 40.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable electric spindle, characterized in that, include: A housing (1) is rotatably connected to a drive shaft (2), and a connecting pipe (3) is fixedly connected to one end of the drive shaft (2). Also includes: Telescopic mechanism (4), the telescopic mechanism (4) includes a fixed pipe (5) fixedly installed at one end of the connecting pipe (3), a sleeve pipe (6) is slidably connected to the outer wall of the fixed pipe (5), and an output shaft (7) is fixedly connected to one end of the sleeve pipe (6) for adjusting the position of the sleeve pipe (6) relative to the fixed pipe (5), thereby changing the length of the output shaft (7). Adjustment mechanism (8) includes multiple sets of opening and closing plates (9) installed on the outer wall of the output shaft (7). The multiple sets of opening and closing plates (9) can be combined into a ring shape to fit against the outer wall of the output shaft (7). When the drive shaft (2) rotates in the forward direction, the opening and closing plates (9) are opened to the required position to drive the operating component to be fixed and rotated. When the drive shaft (2) rotates in the reverse direction, the opening and closing plates (9) are driven to fit against the outer wall of the output shaft (7) to release the drive state. The connecting mechanism (10) includes multiple sets of drive teeth (11) mounted on the opening and closing plate (9) for supporting and fixing the operating component, and driving the operating component to rotate through the drive teeth (11); The adjustment mechanism (8) further includes a first sliding frame (12) and a second sliding frame (13) slidably connected to the inner wall of the output shaft (7). Both the first sliding frame (12) and the second sliding frame (13) are rotatably connected to a connecting rod (14) rotatably connected to the opening and closing plate (9). Multiple sets of adjustment grooves (15) are evenly provided on the side of the output shaft (7) and slidably fit against the outer wall of the connecting rod (14). A first spring (16) is fixedly connected between the first sliding frame (12) and the second sliding frame (13). A sliding member (17) is provided inside the output shaft (7) for synchronously driving the first sliding frame (12) and the second sliding frame (13) to slide. The sliding member (17) includes a fixed... Sliding tubes (18) are installed on the sides of the first sliding frame (12) and the second sliding frame (13). The sliding tubes (18) slide against the inner wall of the output shaft (7). One end of the output shaft (7) is connected to the sleeve (6). A connecting frame (19) is fixedly connected inside the sleeve (6). A conveying tube (20) is fixedly connected to the connecting frame (19). The conveying tube (20) passes through the first sliding frame (12) and the second sliding frame (13) and slides against the inner wall of the first sliding frame (12) and the second sliding frame (13). One end of the conveying tube (20) is connected to the sleeve (6), and the other end is connected to the sliding tube (18) on the side of the first sliding frame (12). 8) Connected, the connecting pipe (3) is provided with a control component (21) for controlling the pressure in the sliding pipes (18) on both sides; the control component (21) includes a fixed shaft (22) fixedly installed in the housing (1), the fixed shaft (22) passes through the drive shaft (2) and the connecting pipe (3), and is rotatably connected to the inner wall of the drive shaft (2), the sleeve pipe (6) is used to store hydraulic oil, the inner wall of the connecting pipe (3) is slidably connected with a push plate (23), the fixed shaft (22) passes through the push plate (23), and is movably sleeved with the inner wall of the push plate (23), the push plate (23) is provided with a function to change the pressure of the push plate (23) when the connecting pipe (3) drives the push plate (23) to rotate. 23) Driving component (24) in the direction of movement; the driving component (24) includes a driving block (25) fixedly installed on the inner wall of the push plate (23), and the outer wall of the fixed shaft (22) is provided with a first annular groove (26), a second annular groove (27) and a threaded groove (28) that can slide with the driving block (25). The two ends of the threaded groove (28) are respectively connected to the first annular groove (26) and the second annular groove (27). A second spring (29) fixedly connected to the drive shaft (2) is fixedly connected to one side of the push plate (23), and a sealing tube (30) that slides against the outer wall of the fixed shaft (22) is fixedly connected to the side of the push plate (23) away from the second spring (29).

2. The adjustable electric spindle according to claim 1, characterized in that: The adjustment mechanism (8) further includes a guide plate (31) and a guide block (32) fixedly installed at both ends of the opening and closing plate (9). The side of the output shaft (7) is provided with a guide groove (33) that is slidably connected to the guide plate (31). The guide block (32) is slidably connected to one end of the sleeve pipe (6).

3. An adjustable electric spindle according to claim 1, characterized in that: The telescopic mechanism (4) further includes a rotating shaft (34) rotatably connected to the housing (1). A drive gear (35) is coaxially fixedly connected to the rotating shaft (34). Multiple sets of annular tooth blocks (36) meshing with the drive gear (35) are uniformly fixedly connected to the outer wall of the sleeve (6). A limiting member (37) is provided on the rotating shaft (34) for automatically limiting the rotating shaft (34) during the adjustment process.

4. An adjustable electric spindle according to claim 1, characterized in that: The connecting mechanism (10) further includes an internal toothed ring (38) fixedly installed on the inner wall of the operating member, the internal toothed ring (38) being able to mesh and engage with the driving tooth (11).

5. An adjustable electric spindle according to claim 3, characterized in that: The limiting member (37) includes a worm gear (39) coaxially fixedly mounted on the rotating shaft (34), and a worm (40) rotatably connected to the housing (1) and meshing with the worm gear (39).

Images