Adjustable electric spindle

Abstract

The invention discloses an adjustable motorized spindle, relates to the field of motorized spindles, and solves the problem that when an existing adjustable motorized spindle is used, the outer diameter size and the length of an output shaft are difficult to adjust to adapt to different operating parts for driving, the adjustable motorized spindle comprises a shell, a telescopic mechanism, an adjusting mechanism and a connecting mechanism, one end of the driving shaft is fixedly connected with a connecting pipe, the telescopic mechanism comprises a fixing pipe, a sleeving pipe and an output shaft, the adjusting mechanism comprises multiple sets of opening and closing plates, and the connecting mechanism comprises driving teeth. And when the driving shaft rotates in the reverse direction, the opening and closing plate is driven to be opened to the needed position to drive the operation piece to be fixed and rotate, when the driving shaft rotates in the reverse direction, the opening and closing plate is driven to be attached to the outer wall of the output shaft, the driving state is relieved, and the operation piece is supported and fixed through the connecting mechanism and driven to rotate.

Description

Technical Field

[0001] The invention relates to the technical field of electric spindles, in particular to an adjustable electric spindle. Background Art

[0002] With the rapid development and improvement of electric transmission technology (variable frequency speed regulation technology, motor vector control technology, etc.), the mechanical structure of the main transmission system of high-speed CNC machine tools has been greatly simplified, and the pulley drive and gear drive have been basically eliminated. The machine tool spindle is directly driven by a built-in 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] The existing electric spindle has a relatively fixed length and outer diameter after being fixedly connected to the rotor of the driving motor and cannot be adjusted. When the spindle length and outer diameter cannot meet the production requirements, it is necessary to replace the spindle with a different length and outer diameter for adaptation, which greatly reduces the operation efficiency and also increases the production cost. To this end, we propose an adjustable electric spindle. Summary of the invention

[0004] The object of the present invention is to provide an adjustable electric spindle which is convenient for flexibly adjusting and adapting the outer diameter and length of the output shaft, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adjustable electric spindle, comprising a housing, a telescopic mechanism, an adjusting mechanism and a connecting mechanism, wherein a driving shaft is rotatably connected in the housing, one end of the driving shaft is fixedly connected to a connecting tube, the telescopic mechanism comprises a fixed tube fixedly installed at one end of the connecting tube, a sleeve tube is slidably connected to the outer wall of the fixed tube, one end of the sleeve tube is fixedly connected to an output shaft for adjusting the position of the sleeve tube relative to the fixed tube, thereby changing the length of the output shaft, the adjusting mechanism comprises a plurality of groups of sleeve tubes installed on the outer wall of the output shaft The opening and closing plates can be combined into a circular ring shape to fit the outer wall of the output shaft, and are used to drive the opening and closing plates to open to the required position and drive the operating member to be fixed and rotated when the drive shaft rotates forward. When the drive shaft rotates reversely, the opening and closing plates are driven to fit the outer wall of the output shaft to release the driving state. The connecting mechanism includes multiple groups of driving teeth installed on the opening and closing plates, which are used to support and fix the operating member, and drive the operating member to rotate through the driving teeth, so as to flexibly adjust and adapt the outer diameter and length of the output shaft.

[0006] Preferably, the adjustment mechanism also includes a first sliding frame and a second sliding frame slidably connected to the inner wall of the output shaft, the first sliding frame and the second sliding frame are both rotatably connected to a connecting rod rotatably connected to the opening and closing plate, the side surface of the output shaft is evenly provided with a plurality of adjustment grooves slidably engaged with the outer wall of the connecting rod, a first spring is fixedly connected between the first sliding frame and the second sliding frame, a sliding member is provided in the output shaft for synchronously driving the first sliding frame and the second sliding frame to slide, so that when the driving shaft rotates forward, the opening and closing plate is driven to open to the desired position and drive the operating member to be fixed and rotated, and when the driving shaft rotates reversely, the opening and closing plate is driven to engage with the outer wall of the output shaft to release the driving state.

[0007] Preferably, the sliding member includes a sliding tube fixedly mounted on the sides of the first sliding frame and the second sliding frame, the sliding tube slidably fits with 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 to 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 slidably fits with 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, a control member for controlling the pressure in the sliding tubes on both sides is provided in the connecting tube, so as to synchronously drive the first sliding frame and the second sliding frame to slide.

[0008] Preferably, the control member includes a fixed shaft fixedly installed in the shell, the fixed shaft passes through the drive shaft and the connecting tube, and is rotatably connected to the inner wall of the drive shaft, the sleeve tube is used to store hydraulic oil, the inner wall of the connecting tube is slidably connected with a push plate, the fixed shaft passes through the push plate, and is movably sleeved with the inner wall of the push plate, and a driving member is provided on the push plate for changing the moving direction of the push plate when the connecting tube drives the push plate to rotate, so as to facilitate controlling the pressure in the sliding tubes on both sides.

[0009] Preferably, the driving member includes a driving block fixedly mounted on the inner wall of the pushing plate, the outer wall of the fixed shaft is provided with a first annular groove, a second annular groove and a threaded groove which can be slidably connected to the driving block, the two ends of the threaded groove are respectively connected to the first annular groove and the second annular groove, one side of the pushing plate is fixedly connected to a second spring fixedly connected to the driving shaft, and the side of the pushing plate away from the second spring is fixedly connected to a sealing tube which slidably fits with the outer wall of the fixed shaft, so as to facilitate changing the moving direction of the pushing plate when the connecting tube drives the pushing plate to rotate.

[0010] Preferably, the adjustment mechanism also includes a guide plate and a guide block fixedly mounted on both ends of the opening and closing plate, a guide groove slidably connected to the guide plate is provided on the side of the output shaft, and the guide block is slidably connected to one end of the sleeve tube to facilitate limiting and guiding the sliding of the opening and closing plate.

[0011] Preferably, the telescopic mechanism also includes a rotating shaft rotatably connected to the shell, a driving gear is coaxially fixedly connected to the rotating shaft, a plurality of groups of annular gear blocks meshing with the driving gear are evenly fixedly connected to the outer wall of the sleeve tube, and a limiting member for automatically limiting the rotating shaft during the adjustment process is provided on the rotating shaft, so as to facilitate the adjustment of the position of the sleeve tube relative to the fixed tube, thereby changing the length of the output shaft.

[0012] Preferably, the connection mechanism further comprises an inner gear ring fixedly mounted on the inner wall of the operating member, and the inner gear ring can mesh and engage with the driving teeth to facilitate supporting and fixing the operating member, and driving the operating member to rotate through the driving teeth.

[0013] Preferably, the limiting member comprises a worm wheel coaxially fixedly mounted on the rotating shaft, and a worm meshing with the worm wheel is rotatably connected to the housing, so as to automatically limit the rotating shaft during the adjustment process.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] An adjustable electric spindle provided by the present invention solves the problem that the outer diameter and length of the output shaft of the existing adjustable electric spindle are difficult to adjust to adapt to different operating parts for driving when in use. It is convenient to change the length of the output shaft by adjusting the position of the sleeve tube relative to the fixed tube. When the drive shaft rotates forward, the opening and closing plate is driven to open to the required position to drive the operating part to be fixed and rotated. When the drive shaft rotates reversely, the opening and closing plate is driven to fit the outer wall of the output shaft to release the driving state. The operating part is supported and fixed by the connecting mechanism and driven to rotate. The device has strong structural integrity, convenient and efficient operation, can flexibly adjust the extended length of the output shaft and automatically limit it, and can automatically support and fix the inner wall of the operating part during operation to complete the adaptive driving operation, improve the loading and unloading efficiency, and effectively improve the production and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 It is a schematic diagram of the local structure of the connecting mechanism of the present invention;

[0018] Figure 3 for Figure 2A magnified image of the middle A area;

[0019] Figure 4 It is a schematic diagram of the partial structure of the telescopic mechanism of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of area B;

[0021] Figure 6 It is a schematic diagram of the local structure of the regulating mechanism of the present invention;

[0022] Figure 7 It is a schematic diagram of the local structure of the sliding member of the present invention;

[0023] Figure 8 for Figure 7 Enlarged view of area C in the middle;

[0024] Fig. 9 for Figure 7 Enlarged view of area D in the middle;

[0025] Fig.10 It is a partial structural sectional view of the adjusting mechanism of the present invention.

[0026] In the figure: 1-housing; 2-driving shaft; 3-connecting tube; 4-telescopic mechanism; 5-fixing tube; 6-sleeve tube; 7-output shaft; 8-adjusting mechanism; 9-opening and closing plate; 10-connecting mechanism; 11-driving tooth; 12-first sliding frame; 13-second sliding frame; 14-connecting rod; 15-adjusting groove; 16-first spring; 17-sliding member; 18-sliding tube; 19-connecting frame; 20-delivery tube; 21-control Component; 22-fixed shaft; 23-pushing plate; 24-driving component; 25-driving 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-driving gear; 36-annular gear block; 37-limiting component; 38-inner gear ring; 39-worm wheel; 40-worm; 41-operating component. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] See also Figure 1-Figure 10, an adjustable electric spindle shown in the figure includes a housing 1, a telescopic mechanism 4, an adjusting mechanism 8 and a connecting mechanism 10, a driving shaft 2 is rotatably connected in the housing 1, one end of the driving shaft 2 is fixedly connected to a connecting pipe 3, the telescopic mechanism 4 includes a fixed pipe 5 fixedly installed at one end of the connecting pipe 3, the outer wall of the fixed pipe 5 is slidably connected to a sleeve pipe 6, one end of the sleeve pipe 6 is fixedly connected to an output shaft 7, which 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 a plurality of opening and closing plates 9 installed on the outer wall of the output shaft 7, and the plurality of opening and closing plates 9 can be combined into a circular ring shape with The outer wall of the output shaft 7 is in contact with each other, and is used to drive the opening and closing plate 9 to open to the desired position and drive the operating part 41 to be fixed and rotated when the drive shaft 2 rotates in the forward direction. 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 to release the driving state. The connecting mechanism 10 includes multiple groups of driving teeth 11 installed on the opening and closing plate 9. The connecting mechanism 10 also includes an inner gear ring 38 fixedly installed on the inner wall of the operating part 41. The inner gear ring 38 can mesh with the driving teeth 11, and is used to support and fix the operating part 41, and drive the operating part 41 to rotate through the driving teeth 11.

[0030] The adjusting mechanism 8 also includes a first sliding frame 12 and a second sliding frame 13 which are slidably connected to the inner wall of the output shaft 7. The first sliding frame 12 and the second sliding frame 13 are both rotatably connected to a connecting rod 14 which is rotatably connected to the opening and closing plate 9. The side of the output shaft 7 is evenly provided with a plurality of adjusting grooves 15 which are slidably fitted with 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 for synchronously driving the first sliding frame 12 and the second sliding frame 13 to slide is provided in the output shaft 7. The adjusting mechanism 8 also includes a guide plate 31 and a guide block 32 which are fixedly installed at both ends of the opening and closing plate 9. A guide groove 33 which is slidably connected to the guide plate 31 is provided on the side of the output shaft 7. The guide block 32 is slidably connected to one end of the sleeve pipe 6.

[0031] The sliding member 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 is slidably fitted with the inner wall of the output shaft 7. One end of the output shaft 7 is connected to the sleeve tube 6. A connecting frame 19 is fixedly connected inside the sleeve tube 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 is slidably fitted with the inner walls of the first sliding frame 12 and the second sliding frame 13. One end of the conveying pipe 20 is connected to the sleeve tube 6, and the other end is connected to the sliding tube 18 on the side of the first sliding frame 12. A control member 21 for controlling the pressure in the sliding tubes 18 on both sides is provided in the connecting tube 3.

[0032] The control member 21 includes a fixed shaft 22 fixedly installed in the shell 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 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 driving member 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 member 24 includes a driving block 25 fixedly mounted on the inner wall of the pushing 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 which can be slidably connected to 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. One side of the pushing plate 23 is fixedly connected to a second spring 29 fixedly connected to the driving shaft 2. The side of the pushing plate 23 away from the second spring 29 is fixedly connected to a sealing tube 30 which slides in contact with the outer wall of the fixed shaft 22.

[0034] In this implementation plan, it is stipulated that Figure 7 In the left view, the connecting pipe 3 drives the push plate 23 to rotate counterclockwise for positive rotation and clockwise for reverse rotation. When the driving shaft 2 drives the connecting shaft to rotate forward, the push plate 23 is pushed by the second spring 29 during the rotation, and the driving block 25 gradually slides from the second annular groove 27 to the threaded groove 28. After sliding into the first annular groove 26, 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 to the inner wall of the output shaft 7, and transport it to the position of 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 toward each other, compressing the first spring 16, and making the connecting rods 14 on both sides push the opening and closing plate 9 to open to the surroundings, and the guide plate 31 slides in the guide groove 33. The guide block 32 is slidably guided at one end of the sleeve pipe 6, so that the opening and closing plate 9 is in a horizontal state and evenly opens away from the output shaft 7.

[0035] It is worth noting that: when installing the operating member 41, first adjust the telescopic mechanism 4 so that the sleeve tube 6 slides on the outer wall of the fixed tube 5, driving the output shaft 7 to slide to the desired position and insert it into the installation cavity of the operating member 41. An inner gear ring 38 is provided in the installation cavity, which can be opened to the surroundings through the opening and closing plate 9 when the output shaft 7 rotates subsequently, and automatically engages the inner gear ring 38 through the driving teeth 11 and drives the operating member 41 to rotate. Since the outer diameter range that the opening and closing plate 9 can adjust is small, the curvature of the outer wall changes little, which does not affect the engagement and driving of the driving teeth 11 and the inner gear ring 38.

[0036] It should be noted that: since the volume of the cavity between the first annular groove 26 and the second annular groove 27 is much larger than the volume in the sleeve tube 6, when the push plate 23 slides from the second annular groove 27 to the first annular groove 26, the hydraulic oil pressure will be compressed to a greater strength, ensuring that no matter where the sleeve tube 6 slides to, the first sliding frame 12 and the second sliding frame 13 can be pushed to the extreme position, ensuring that the opening and closing plate 9 can tightly contact 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 to prevent the internal hydraulic oil from leaking to the outside through the adjusting groove 15.

[0037] When the operation is completed, the driving shaft 2 is controlled to rotate in the opposite direction. At this time, the connecting tube 3 drives the pushing plate 23 to rotate in the opposite direction relative to the fixed shaft 22. The pushing plate 23 gradually slides from the first annular groove 26 into the threaded groove 28 under the pull of the second spring 29, and finally slides into the second sliding groove for continuous rotation to complete the reset. At the same time, the hydraulic oil in the output shaft 7 is pumped into the connecting tube 3 to reduce the hydraulic strength 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 synchronously slide and fit toward the outer wall of the output shaft 7, completing the contraction and reset of the opening and closing plate 9, which is convenient for clamping and driving the operating member 41 that is subsequently replaced.

[0038] Example 2

[0039] See also Figure 1-Figure 10 Embodiment 2 is described. This embodiment further describes embodiment 1. The telescopic mechanism 4 shown in the figure also includes a rotating shaft 34 rotatably connected to the shell 1. A driving gear 35 is coaxially fixedly connected to the rotating shaft 34. The outer wall of the sleeve 6 is evenly fixedly connected to multiple groups of annular gear blocks 36 meshing with the driving gear 35. The rotating shaft 34 is provided with a limit member 37 for automatically limiting the rotating shaft 34 during the adjustment process. The limit member 37 includes a worm wheel 39 coaxially fixedly installed on the rotating shaft 34. A worm 40 meshing with the worm wheel 39 is rotatably connected to the shell 1.

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

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims

1. An adjustable electric spindle, characterized in that: include: A housing (1), wherein 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); Also includes: A telescopic mechanism (4), the telescopic mechanism (4) comprising a fixed tube (5) fixedly mounted on one end of the connecting tube (3), the outer wall of the fixed tube (5) being slidably connected to a sleeve tube (6), one end of the sleeve tube (6) being fixedly connected to an output shaft (7) for adjusting the position of the sleeve tube (6) relative to the fixed tube (5), thereby changing the length of the output shaft (7); An adjusting mechanism (8), the adjusting mechanism (8) comprising a plurality of opening and closing plates (9) mounted on the outer wall of the output shaft (7), the plurality of opening and closing plates (9) being capable of being combined into a circular ring shape and being fitted with the outer wall of the output shaft (7), and being used for driving the opening and closing plates (9) to open to a desired position and drive the operating member to be fixed and rotated when the drive shaft (2) rotates in the forward direction, and driving the opening and closing plates (9) to fit with the outer wall of the output shaft (7) and release the driving state when the drive shaft (2) rotates in the reverse direction; The connecting mechanism (10) comprises a plurality of driving teeth (11) mounted on the opening and closing plate (9), and is used for supporting and fixing the operating member, and driving the operating member to rotate through the driving teeth (11).

2. An adjustable electric spindle according to claim 1, characterized in that: The adjustment mechanism (8) further comprises a first sliding frame (12) and a second sliding frame (13) which are slidably connected to the inner wall of the output shaft (7); the first sliding frame (12) and the second sliding frame (13) are both rotatably connected to a connecting rod (14) which is rotatably connected to the opening and closing plate (9); a plurality of adjustment grooves (15) which are slidably fitted to the outer wall of the connecting rod (14) are evenly arranged on the side surface of the output shaft (7); a first spring (16) is fixedly connected between the first sliding frame (12) and the second sliding frame (13); and a sliding member (17) is arranged inside the output shaft (7) for synchronously driving the first sliding frame (12) and the second sliding frame (13) to slide.

3. An adjustable electric spindle according to claim 2, characterized in that: The sliding member (17) comprises a sliding tube (18) fixedly mounted on the side of the first sliding frame (12) and the second sliding frame (13); the sliding tube (18) is slidably fitted with the inner wall of the output shaft (7); one end of the output shaft (7) is connected to the sleeve tube (6); a connecting frame (19) is fixedly connected inside the sleeve tube (6); a delivery tube (20) is fixedly connected to the connecting frame (19); the delivery tube (20) passes through the first sliding frame (12) and the second sliding frame (13) and is slidably fitted with the inner walls of the first sliding frame (12) and the second sliding frame (13); one end of the delivery tube (20) is connected to the sleeve tube (6); the other end is connected to the sliding tube (18) on the side of the first sliding frame (12); a control member (21) for controlling the pressure in the sliding tubes (18) on both sides is provided inside the connecting tube (3).

4. An adjustable electric spindle according to claim 3, characterized in that: The control member (21) comprises a fixed shaft (22) fixedly mounted in the housing (1), the fixed shaft (22) passing through the drive shaft (2) and the connecting pipe (3), and being rotatably connected to the inner wall of the drive shaft (2), the sleeve pipe (6) being used to store hydraulic oil, the inner wall of the connecting pipe (3) being slidably connected to a push plate (23), the fixed shaft (22) passing through the push plate (23), and being movably sleeved to the inner wall of the push plate (23), and the push plate (23) being provided with a driving member (24) for changing the moving direction of the push plate (23) when the connecting pipe (3) drives the push plate (23) to rotate.

5. An adjustable electric spindle according to claim 4, characterized in that: The driving member (24) comprises a driving block (25) fixedly mounted on the inner wall of the pushing 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) which can be slidably connected to 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); one side of the pushing plate (23) is fixedly connected to a second spring (29) fixedly connected to the driving shaft (2); and the side of the pushing plate (23) away from the second spring (29) is fixedly connected to a sealing tube (30) which is slidably fitted to the outer wall of the fixed shaft (22).

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

7. The adjustable electric spindle according to claim 1, characterized in that: The telescopic mechanism (4) further comprises a rotating shaft (34) rotatably connected to the housing (1); a driving gear (35) is coaxially fixedly connected to the rotating shaft (34); a plurality of groups of annular gear blocks (36) meshing with the driving gear (35) are evenly fixedly connected to the outer wall of the sleeve tube (6); and a limiting member (37) for automatically limiting the rotating shaft (34) during adjustment is provided on the rotating shaft (34).

8. The adjustable electric spindle according to claim 1, characterized in that: The connecting mechanism (10) also includes an inner tooth ring (38) fixedly mounted on the inner wall of the operating member, and the inner tooth ring (38) can be meshed and engaged with the driving teeth (11).

9. The adjustable electric spindle according to claim 7, characterized in that: The limiting member (37) comprises a worm wheel (39) coaxially fixedly mounted on the rotating shaft (34), and a worm (40) meshing with the worm wheel (39) is rotatably connected to the housing (1).

Images