A motor rotor shaft turning clamp capable of adaptive holding and flexible positioning

Abstract

The utility model discloses a motor rotor shaft turning clamp that can be self-adaptive and tightly hold and flexibly position, relates to the field of machining, and is composed of Morse taper, external thread connecting shaft, spring collet, threaded sleeve and adjusting sleeve and other components for connecting with the main shaft of machine tool. The sliding cavity of the front end of the external thread connecting shaft is provided with a sliding sleeve and a telescopic spring, and the sliding sleeve is fixedly connected with the spring collet. The sleeve sleeve of the front end of the threaded sleeve is sleeved outside the spring collet, and the inner wall of the front end is provided with a conical surface that is matched with the conical head of the spring collet. The adjusting sleeve is connected with the threaded sleeve through threads, and can drive the limiting sleeve to push the spring collet to move. During use, rotating the adjusting sleeve makes the spring collet move backward, and the spring collet is tightened under the action of the conical surface, the rotor shaft is self-adaptively and tightly held, and the telescopic spring realizes flexible positioning and compensates for the axial and angular deviation. The clamp can automatically adapt to the rotor shaft with a diameter tolerance within a certain range, has high self-centering precision, is suitable for high-precision turning machining of conventional rotor shafts, and has simple structure and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of machining, specifically a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning. Background Technology

[0002] In the field of motor manufacturing, the rotor shaft, as a core component, directly affects the operational stability and service life of the motor due to its machining accuracy. Traditional motor rotor shaft turning fixtures mainly use rigid three-jaw chucks or ordinary spring collets for clamping and positioning. While rigid three-jaw chucks can provide a large clamping force, they have strict requirements on the dimensional tolerances of the rotor shaft and are prone to eccentric clamping problems, resulting in out-of-tolerance roundness and coaxiality of the machined shaft parts. Although ordinary spring collets have a certain degree of self-adaptive capability, they lack flexible positioning functions and cannot compensate for the axial movement or angular deviation of the rotor shaft. When machining thin-walled rotor shafts, excessive rigid clamping force often causes workpiece deformation, affecting machining accuracy.

[0003] Therefore, those skilled in the art have provided a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A turning fixture for a motor rotor shaft capable of adaptive clamping and flexible positioning includes a Morse taper for connection to a machine tool spindle. The front end of the Morse taper is axially fixedly connected to an externally threaded connecting shaft. A sliding cavity is axially formed on the front end face of the externally threaded connecting shaft. A sliding sleeve and a telescopic spring are axially disposed within the sliding cavity. A spring clip is fixedly connected to the rear end of the sliding sleeve. A threaded sleeve is threaded onto the external threaded connecting shaft. A sleeve is axially fixedly connected to the front end of the threaded sleeve, and the sleeve is coaxially fitted onto the outside of the spring clip. A limiting sleeve is movably fitted onto the front end of the sleeve, and an adjusting sleeve is movably fitted onto the outer wall of the limiting sleeve.

[0007] As a further embodiment of this utility model: the sliding sleeve forms a sliding fit with the inner wall of the sliding cavity, the natural length of the telescopic spring is greater than the axial length of the sliding sleeve, and its end extends out of the sliding sleeve and abuts against the bottom of the sliding cavity.

[0008] As a further embodiment of this utility model: the front end of the spring sleeve is configured as an external conical structure, and a spring collet for gripping the motor rotor shaft is vertically fixedly connected to the front end face of the spring sleeve, and the spring collet and the front end face of the spring sleeve form a stepped structure.

[0009] As a further embodiment of this utility model: the inner wall of the front end of the sleeve is provided with an inner conical surface that is adapted to the outer conical structure of the front end of the spring clip, and the inner conical surface and the outer conical structure of the spring clip form a sliding fit.

[0010] As a further embodiment of this utility model: an annular block is radially fixedly connected to the outer wall of the limiting sleeve near the end, and a through hole adapted to the outer diameter of the limiting sleeve is opened at the front end of the adjusting sleeve, and the inner wall of the front end face of the adjusting sleeve and the rear end face of the annular block form an axial abutment fit.

[0011] As a further embodiment of this utility model: an external threaded post is fixedly sleeved on the outer wall of the threaded sleeve, and the external threaded post is coaxially arranged with the threaded sleeve.

[0012] As a further embodiment of this utility model: a cylindrical tube is axially fixedly connected to the end of the adjusting sleeve, and an internal thread is provided on the inner wall of the cylindrical tube. The cylindrical tube forms a threaded transmission engagement with the external threaded column through the internal thread.

[0013] As a further improvement of this utility model: three threaded holes are opened at equal angles along the circumference on the outer wall of the adjusting sleeve, and a screw for rotating the adjusting sleeve is threaded into each threaded hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. High-precision adaptive clamping: This invention achieves synchronous contraction of the spring collet by using the conical surface cooperation between the spring collet and the sleeve. It can automatically adapt to rotor shafts with diameter tolerances within a certain range, resulting in high self-centering accuracy. Compared with traditional fixtures, it effectively avoids eccentric clamping problems caused by workpiece size deviations, thus improving product qualification rate.

[0016] 2. Flexible Positioning Compensation: The telescopic spring allows the spring collet to generate a certain amount of axial floating and angular compensation, which can automatically offset the coaxiality error and end face runout of the rotor shaft. When machining thin-walled rotor shafts, the flexible clamping force of the spring collet is evenly distributed, avoiding workpiece deformation and meeting high-precision machining requirements.

[0017] 3. Rapid clamping and efficient production: The rotor shaft can be quickly clamped and released by the rotational drive of the adjusting sleeve and threaded pair, greatly improving clamping efficiency compared to traditional manual adjustment fixtures. Furthermore, this fixture eliminates the need for frequent tooling changes, is adaptable to various rotor shaft specifications, and is particularly suitable for batch processing on automated production lines.

[0018] 4. Simple structure and easy maintenance: The overall structure adopts a purely mechanical design, without complex electronic components or hydraulic systems, reducing equipment failure rate and maintenance costs. Each component uses a modular design; easily damaged parts such as spring clips and telescopic springs can be quickly disassembled and replaced, reducing enterprise costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0020] Figure 2 This is a schematic diagram of the external threaded connection shaft and spring sleeve in a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0021] Figure 3 This is a schematic diagram of the telescopic spring and sliding sleeve in a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0022] Figure 4 This is a schematic diagram of the external threaded column and sleeve in a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0023] Figure 5 This is a schematic diagram of the limiting sleeve in a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0024] Figure 6 This is a schematic diagram of the adjusting sleeve and cylindrical tube in a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0025] Figure 7 This is a schematic diagram of a half-section view of a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning.

[0026] In the diagram: 1. Morse taper; 2. External threaded connecting shaft; 3. Sliding cavity; 4. Telescopic spring; 5. Sliding sleeve; 6. Spring collet; 7. Threaded sleeve; 8. External threaded post; 9. Sleeve; 10. Internal conical surface; 11. Limiting sleeve; 12. Annular block; 13. Cylindrical tube; 14. Adjusting sleeve; 15. Screw; 16. Internal thread; 17. Through hole; 18. Spring collet. Detailed Implementation

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

[0028] Example 1

[0029] Reference Figures 1-7 This embodiment provides a motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning, including a Morse taper 1 for connection to a machine tool spindle. The front end of the Morse taper 1 is axially fixedly connected to an externally threaded connecting shaft 2. The front end face of the externally threaded connecting shaft 2 has an axially formed sliding cavity 3. A sliding sleeve 5 and a telescopic spring 4 are arranged axially inside the sliding cavity 3. A spring clip 6 is fixedly connected to the rear end of the sliding sleeve 5. A threaded sleeve 7 is threadedly connected to the external thread of the externally threaded connecting shaft 2. A sleeve 9 is axially fixedly connected to the front end of the threaded sleeve 7. The sleeve 9 is coaxially sleeved outside the spring clip 6. A limiting sleeve 11 is movably sleeved at the front end of the sleeve 9. An adjusting sleeve 14 is movably sleeved on the outer wall of the limiting sleeve 11.

[0030] Example 2

[0031] Reference Figures 1-7 This embodiment is based on the previous embodiment, but differs in that the sliding sleeve 5 and the inner wall of the sliding cavity 3 form a sliding fit; the natural length of the telescopic spring 4 is greater than the axial length of the sliding sleeve 5, and its end extends out of the sliding sleeve 5 and abuts against the bottom of the sliding cavity 3; the front end of the spring clip 6 is configured as an outer conical structure, and the front end face of the spring clip 6 is vertically fixedly connected to a spring collet 18 for gripping the motor rotor shaft, and the spring collet 18 and the front end face of the spring clip 6 form a stepped structure; the inner wall of the front end of the sleeve 9 is provided with an inner conical surface 10 that is adapted to the outer conical structure of the front end of the spring clip 6, and the inner conical surface 10 and the outer conical structure of the spring clip 6 form a sliding fit.

[0032] Furthermore, an annular block 12 is radially fixedly connected to the outer wall of the limiting sleeve 11 near the end. The front end of the adjusting sleeve 14 has a through hole 17 that matches the outer diameter of the limiting sleeve 11. The inner wall of the front end face of the adjusting sleeve 14 and the rear end face of the annular block 12 form an axial abutment fit. An external threaded post 8 is fixedly sleeved on the outer wall of the threaded sleeve 7. The external threaded post 8 and the threaded sleeve 7 are coaxially arranged. The end of the adjusting sleeve 14 is axially fixedly connected to a cylindrical cylinder 13. An internal thread 16 is provided on the inner wall of the cylindrical cylinder 13. The cylindrical cylinder 13 and the external threaded post 8 form a threaded transmission fit through the internal thread 16.

[0033] Furthermore, the outer wall of the adjusting sleeve 14 is provided with three threaded holes at equal angles along the circumference, and each threaded hole is threaded with a screw 15 for rotating the adjusting sleeve 14.

[0034] Working principle: In the initial state, the adjusting sleeve 14 is in the initial position (not tightened), and the limiting sleeve 11 moves forward to its limit position under the action of the telescopic spring 4. The conical surface at the front end of the spring clip 6 is not in complete contact with the conical surface of the sleeve 9, and the spring collet 18 is in the open state with an inner diameter larger than the rotor shaft diameter. The telescopic spring 4 is in the naturally extended state, providing initial preload to ensure the stability of the position of each component. During the clamping process, the adjusting sleeve 14 is rotated clockwise by the screw 15, and the internal thread 16 of the cylindrical tube 13 engages with the external thread post 8, causing the adjusting sleeve 14 to move axially backward (towards the Morse taper 1). The inner wall of the front end face of the adjusting sleeve 14 abuts against the annular block 12 of the limiting sleeve 11, causing the limiting sleeve 11 to move backward synchronously. The limiting sleeve 11 abuts against the stepped surface formed by the spring clip 6 and the spring collet 18, pushing the spring clip 6 and the sliding sleeve 5 to slide backward along the sliding cavity 3, compressing the telescopic spring 4 to store elastic potential energy. The tapered surface at the front end of the spring sleeve 6 gradually comes into contact with the inner tapered surface 10 of the sleeve 9. Under the action of the tapered surface, the front end of the spring sleeve 6 contracts radially, causing the spring collet 18 to tighten synchronously. The spring collet 18 clamps the rotor shaft with a uniform radial force, achieving self-centering positioning. The adaptive and flexible characteristics of the spring collet 18 can automatically adjust the amount of contraction according to the actual diameter of the rotor shaft. During the loosening process, the adjusting sleeve 14 is rotated counterclockwise by the screw 15, causing it to move forward axially (away from the Morse taper 1 direction). The telescopic spring 4 releases its elastic potential energy, pushing the spring sleeve 6 and the limiting sleeve 11 forward to reset. The tapered surface at the front end of the spring sleeve 6 disengages from the inner tapered surface 10 of the sleeve 9, and the spring collet 18 returns to its open state under its own elastic action, releasing the rotor shaft. The four-jaw structure of the spring collet 18 ensures that the clamping force is evenly distributed around the rotor shaft circumference through synchronous contraction of the conical surface. The elastic design of the spring collet 18 avoids workpiece deformation caused by rigid clamping, making it particularly suitable for thin-walled rotor shafts. The clamping force is determined by the rotation angle of the adjusting sleeve 14 and is kept constant by the self-locking characteristics of the threaded pair, preventing loosening during processing.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning, characterized in that, The device includes a Morse taper (1) for connection with a machine tool spindle, with an external threaded connecting shaft (2) axially fixed to the front end of the Morse taper (1); a sliding cavity (3) is provided axially on the front end face of the external threaded connecting shaft (2), and a sliding sleeve (5) and a telescopic spring (4) are provided axially inside the sliding cavity (3); a spring clip (6) is fixedly connected to the rear end of the sliding sleeve (5); a threaded sleeve (7) is threadedly connected to the external threaded connecting shaft (2), and a sleeve (9) is axially fixed to the front end of the threaded sleeve (7), and the sleeve (9) is coaxially sleeved outside the spring clip (6); a limiting sleeve (11) is movably sleeved on the front end of the sleeve (9), and an adjusting sleeve (14) is movably sleeved on the outer wall of the limiting sleeve (11).

2. The motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 1, characterized in that, The sliding sleeve (5) forms a sliding fit with the inner wall of the sliding cavity (3). The natural length of the telescopic spring (4) is greater than the axial length of the sliding sleeve (5), and its end extends out of the sliding sleeve (5) and abuts against the bottom of the sliding cavity (3).

3. The motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 1, characterized in that, The front end of the spring sleeve (6) is configured as an external conical structure, and the front end face of the spring sleeve (6) is vertically fixedly connected to a spring collet (18) for clamping the motor rotor shaft. The spring collet (18) and the front end face of the spring sleeve (6) form a stepped structure.

4. A motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 3, characterized in that, The inner wall of the front end of the sleeve (9) is provided with an inner conical surface (10) that is adapted to the outer conical structure of the front end of the spring clip (6). The inner conical surface (10) and the outer conical structure of the spring clip (6) form a sliding fit.

5. A motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 1, characterized in that, An annular block (12) is radially fixedly connected to the outer wall of the limiting sleeve (11) near the end. The front end of the adjusting sleeve (14) is provided with a through hole (17) that matches the outer diameter of the limiting sleeve (11). The inner wall of the front end face of the adjusting sleeve (14) and the rear end face of the annular block (12) form an axial abutment fit.

6. A motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 1, characterized in that, An external threaded post (8) is fixedly sleeved on the outer wall of the threaded sleeve (7), and the external threaded post (8) is coaxially arranged with the threaded sleeve (7).

7. A motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 6, characterized in that, The end of the adjusting sleeve (14) is axially fixedly connected to a cylindrical tube (13). The inner wall of the cylindrical tube (13) is provided with an internal thread (16). The cylindrical tube (13) and the external threaded column (8) form a threaded transmission engagement through the internal thread (16).

8. A motor rotor shaft turning fixture capable of adaptive clamping and flexible positioning according to claim 1, characterized in that, The outer wall of the adjusting sleeve (14) is provided with three threaded holes at equal angles along the circumference, and each threaded hole is threaded with a screw (15) for rotating the adjusting sleeve (14).

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