Generator rotor shaft machining clamp

Abstract

The utility model relates to the technical field of generator rotor shaft machining, in particular to a generator rotor shaft machining clamp which comprises a sliding seat, a polishing mechanism is arranged above the top of the sliding seat, and a supporting assembly is arranged at the top of the sliding seat and used for supporting the polishing mechanism. By arranging the clamping plate in the containing cavity of the ball screw, when the coaxiality of rotor shafts at a three-jaw chuck of a machine tool is inconsistent and needs to be adjusted, before the clamp is loosened, the clamping plate in the containing cavity of the ball screw is moved to the position where the rotor shafts can be clamped through movement of the sliding seat on a linear guide rail of the machine tool, and when the three-jaw chuck is loosened, the clamping plate is moved to the position where the rotor shafts can be clamped. The rotor shaft can be supported by the clamping plates, due to the fact that the V-shaped grooves are formed in the tops of the clamping plates, when the clamping plates are used for supporting, the rotor shaft can be automatically centered, and then the second electric air cylinder pushes the clamping plates above and below the rotor shaft to be close to each other for clamping; when the upper clamping plate and the lower clamping plate clamp the rotor shaft, the coaxiality of the rotor shaft and the machine tool spindle can be adjusted.

Description

Technical Field

[0001] This utility model relates to the field of generator rotor shaft machining technology, specifically a generator rotor shaft machining fixture. Background Technology

[0002] A rotor shaft refers to a rotating body supported by bearings. It is often the main rotating component of power machinery or working machinery such as electric motors, generators, gas turbines, and turbo compressors. During the machining process, the rotor shaft needs to be clamped and fixed by tooling fixtures and then subjected to coaxiality testing. Coaxiality testing refers to the positional relationship between the measured axis and the reference axis, that is, the axis of the measured shaft and the axis of the reference axis must be on the same straight line. For shaft parts that are machined on both sides, ensuring coaxiality is crucial for machining accuracy.

[0003] When performing coaxiality testing on rotor shafts, the workpiece is typically clamped in a three-jaw chuck, ensuring a secure clamping. A dial indicator or micrometer is then mounted on a magnetic base, and the position and angle of the base are adjusted so that the indicator's probe is perpendicularly in contact with the workpiece's outer surface. The probe should have an appropriate preload, typically around 0.2-0.5 mm. The shaft is then slowly rotated manually, and the dial indicator readings are observed during rotation. Measurements are taken at different axial positions on the shaft (e.g., both ends and the middle), and the maximum and minimum readings at each position are recorded. Coaxiality error can be determined by calculating the differences between these readings. Generally, the maximum coaxiality error obtained from each position is taken as the final coaxiality error value. However, whenever coaxiality discrepancies require adjustment, the clamp must be loosened before adjustment. For machining larger rotor shafts, where the operation is extremely laborious and manual calibration is difficult, multiple adjustments are often necessary. Therefore, we propose a generator rotor shaft machining fixture. Utility Model Content

[0004] The purpose of this utility model is to provide a generator rotor shaft machining fixture. This generator rotor shaft machining fixture solves the problem that whenever the coaxiality is inconsistent and adjustment is needed, the fixture must be loosened before adjustment can be made. However, this is extremely laborious and difficult to manually calibrate when machining some large rotor shafts.

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

[0006] A generator rotor shaft machining fixture includes a slide, a grinding mechanism is provided above the top of the slide, and a support assembly is provided on the top of the slide to support the grinding mechanism.

[0007] The grinding mechanism includes a ball screw, the inner wall of which has a receiving cavity. The top and bottom of the receiving cavity are respectively provided with clamping plates. The inner wall of the receiving cavity is fixedly connected to a second electric cylinder for driving the two sets of clamping plates to clamp.

[0008] Preferably, the clamping surface of the clamping plate is provided with a V-shaped groove, and the axis of the ball screw coincides with the axis of the lathe spindle.

[0009] Preferably, a straightening ring is fixedly connected to one end of the ball screw near the lathe spindle, and multiple balls are rotatably connected to the other end of the straightening ring near the lathe spindle, with the balls arranged in a ring array.

[0010] Preferably, the outer wall of the ball screw is threaded with a ball sleeve for supporting the ball screw.

[0011] Preferably, the bottom of the slide is provided with a groove for adapting to the sliding of the linear guide rail of the lathe, and the slide is slidably connected to the linear guide rail through the groove.

[0012] Preferably, the support assembly includes a support platform, which is positioned above the slide block. The top of the support platform has a groove, and a threaded rod is rotatably connected to the inner wall of the groove. A slide table is slidably connected to the top of the support platform, and the bottom of the slide table is threadedly connected to the threaded rod. A knob for driving the threaded rod to rotate is rotatably provided on the outer wall of the support platform. The top of the slide table is fixedly connected to a ball bearing sleeve.

[0013] Preferably, a first electric cylinder is fixedly connected between the top of the slide and the support platform to adjust the height of the support platform.

[0014] By employing the above technical solution, this utility model provides a machining fixture for generator rotor shafts. It possesses at least the following beneficial effects:

[0015] I. This utility model, by setting a clamping plate in the receiving cavity of the ball screw, addresses the issue of misalignment of the rotor shaft at the machine tool's three-jaw chuck requiring adjustment. Before the clamp is released, the movement of the slide along the linear guide of the lathe moves the clamping plate within the receiving cavity of the ball screw to a position where it can clamp the rotor shaft. When the three-jaw chuck is released, the rotor shaft is supported by the clamping plate. Due to the V-shaped groove at the top of the clamping plate, the rotor shaft automatically aligns when supported by the clamping plate. Then, a second electric cylinder pushes the upper and lower clamping plates of the rotor shaft together for clamping. Because the axis of the machine tool spindle and the ball screw... The axis of the rod coincides. When the upper and lower clamping plates clamp the rotor shaft, the coaxiality of the rotor shaft with the machine tool spindle will be adjusted. At this time, the rotor shaft is pushed back into the three-jaw chuck for clamping to improve the adjustment efficiency of the rotor shaft. During the process of pushing the rotor shaft in, the balls of the straightening ring will take priority over the inner contact of the three-jaw chuck. Since the ball screw is supported by the ball sleeve, when the slide moves the balls on the straightening ring to continuously press against the end face of the three-jaw chuck, the ball screw will rotate, thereby driving the rotor shaft to rotate. The end face of the rotor shaft in contact with the three-jaw chuck will fit more tightly to improve the clamping quality.

[0016] II. This utility model uses the extension and retraction of the first electric cylinder to facilitate the adjustment of the height of the ball screw in the Y-axis direction. By turning the knob to drive the threaded rod to rotate, the position of the slide table in the X-axis direction can be adjusted to facilitate the adjustment of the coaxiality between the ball screw and the machine tool spindle, so as to avoid the ball screw from deviating. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the support component in this utility model;

[0020] Figure 3 This is a schematic diagram of the grinding mechanism in this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram: 1. Slide; 2. First electric cylinder; 3. Support assembly; 31. Support platform; 32. Slide groove; 33. Threaded rod; 34. Slide table; 35. Knob; 4. Grinding mechanism; 41. Ball sleeve; 42. Ball screw; 43. Receiving cavity; 44. Clamping plate; 441. V-groove; 442. Second electric cylinder; 45. Correction ring; 451. Ball. Detailed Implementation

[0023] 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.

[0024] A generator rotor shaft machining fixture, such as Figure 1 - Figure 4 As shown, the device includes a slide 1, a grinding mechanism 4 is mounted on the top of the slide 1, and a support assembly 3 is mounted on the top of the slide 1 to support the grinding mechanism 4. The grinding mechanism 4 includes a ball screw 42, and a receiving cavity 43 is formed in the inner wall of the ball screw 42. Clamping plates 44 are respectively provided at the top and bottom of the receiving cavity 43. A second electric cylinder 442 is fixedly connected to the inner wall of the receiving cavity 43 to drive the two sets of clamping plates 44 to clamp. The clamping surfaces of the clamping plates 44 are provided with V-shaped grooves 441. The axis of the ball screw 42 coincides with the axis of the lathe spindle. A straightening ring 45 is fixedly connected to one end of the ball screw 42 near the lathe spindle. Multiple balls 451 are rolledly connected to the other end of the straightening ring 45 near the lathe spindle, and the balls 451 are arranged in a ring array. A ball sleeve 41 is threaded on the outer wall of the ball screw 42 to support the ball screw 42. A groove is opened at the bottom of the slide 1 to adapt to the sliding of the lathe linear guide. The slide 1 is slidably connected to the linear guide through the groove.

[0025] In this embodiment, by setting a clamping plate 44 in the receiving cavity 43 of the ball screw 42, when the coaxiality of the rotor shaft at the three-jaw chuck of the machine tool is inconsistent and needs adjustment, before the clamp is released, the movement of the slide 1 on the linear guide of the lathe moves the clamping plate 44 in the receiving cavity 43 of the ball screw 42 to a position where the rotor shaft can be clamped. When the three-jaw chuck is released, the rotor shaft will be supported by the clamping plate 44. Due to the V-shaped groove 441 opened on the top of the clamping plate 44, the rotor shaft will automatically be aligned when the clamping plate 44 is supporting it. Then, the second electric cylinder 442 pushes the upper and lower clamping plates 44 of the rotor shaft to move closer together for clamping. Since the axis of the machine tool spindle is aligned with the ball screw 42, the clamping plate 44 is adjusted accordingly. The axis of the ball screw 42 coincides. When the upper and lower clamping plates 44 clamp the rotor shaft, the coaxiality of the rotor shaft with the machine tool spindle will be adjusted. At this time, the rotor shaft is pushed back into the three-jaw chuck for clamping to improve the adjustment efficiency of the rotor shaft. During the process of pushing the rotor shaft in, the balls 451 of the straightening ring 45 will make priority contact with the inner surface of the three-jaw chuck. Since the ball screw 42 is supported by the ball sleeve 41, when the slide 1 drives the balls 451 on the straightening ring 45 to continuously press against the end face of the three-jaw chuck, the ball screw 42 will rotate, thereby driving the rotor shaft to rotate. The end face of the rotor shaft in contact with the three-jaw chuck will fit more tightly to improve the clamping quality.

[0026] like Figure 1 , Figure 2 As shown, preferably, the support assembly 3 includes a support platform 31, which is positioned above the slide block 1. The top of the support platform 31 has a groove 32, and a threaded rod 33 is rotatably connected to the inner wall of the groove 32. A slide table 34 is slidably connected to the top of the support platform 31, and the bottom of the slide table 34 is threadedly connected to the threaded rod 33. A knob 35 for driving the threaded rod 33 to rotate is rotatably provided on the outer wall of the support platform 31. The top of the slide table 34 is fixedly connected to the ball bearing sleeve 41. A first electric cylinder 2 is fixedly connected between the top of the slide block 1 and the support platform 31 for adjusting the height of the support platform 31.

[0027] In this embodiment, the extension and retraction of the first electric cylinder 2 facilitates the adjustment of the height of the ball screw 42 in the Y-axis direction. By turning the knob 35, the threaded rod 33 is rotated, allowing the position of the slide table 34 to be adjusted in the X-axis direction, so as to facilitate the adjustment of the coaxiality between the ball screw 42 and the machine tool spindle.

[0028] In the use of this generator rotor shaft machining fixture, before calibrating the coaxiality of the rotor shaft, it is necessary to calibrate the coaxiality of the ball screw 42 and the machine tool spindle. The extension and retraction of the first electric cylinder 2 facilitates the adjustment of the height of the ball screw 42 in the Y-axis direction. Turning the knob 35 rotates the threaded rod 33, allowing the slide table 34 to be adjusted in the X-axis direction, thus facilitating the adjustment of the coaxiality between the ball screw 42 and the machine tool spindle. By setting a clamping plate 44 in the receiving cavity 43 of the ball screw 42, adjustments are needed when the coaxiality of the rotor shaft at the machine tool's three-jaw chuck is inconsistent. Before the fixture is released, the movement of the slide 1 on the lathe's linear guide rail moves the clamping plate 44 within the receiving cavity 43 of the ball screw 42 to a position where the rotor shaft can be clamped. When the three-jaw chuck is released, the rotor shaft is supported by the clamping plate 44. Due to the V-shaped opening at the top of the clamping plate 44… The groove 441 allows the rotor shaft to automatically center when the clamping plate 44 provides support. Then, the second electric cylinder 442 pushes the upper and lower clamping plates 44 of the rotor shaft to move closer together for clamping. Since the axis of the machine tool spindle coincides with the axis of the ball screw 42, when the upper and lower clamping plates 44 clamp the rotor shaft, the coaxiality between the rotor shaft and the machine tool spindle is adjusted. At this time, the rotor shaft is pushed back into the three-jaw chuck for clamping to improve the adjustment efficiency of the rotor shaft. During the process of pushing the rotor shaft in, the balls 451 of the straightening ring 45 will make priority contact with the inner surface of the three-jaw chuck. Since the ball screw 42 is supported by the ball sleeve 41, when the slide 1 drives the balls 451 on the straightening ring 45 to continuously press against the end face of the three-jaw chuck, the ball screw 42 will rotate, thereby driving the rotor shaft to rotate. The end face of the rotor shaft in contact with the three-jaw chuck will fit more tightly to improve the clamping quality.

[0029] 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.

[0030] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A generator rotor shaft machining fixture, comprising a slide (1), characterized in that: A grinding mechanism (4) is provided above the top of the slide (1), and a support component (3) is provided on the top of the slide (1) to support the grinding mechanism (4); The grinding mechanism (4) includes a ball screw (42), the inner wall of which is provided with a receiving cavity (43), and the top and bottom of the receiving cavity (43) are respectively provided with clamping plates (44), and the inner wall of the receiving cavity (43) is fixedly connected to a second electric cylinder (442) for driving the two sets of clamping plates (44) to clamp.

2. The generator rotor shaft machining fixture according to claim 1, characterized in that: The clamping surface of the clamping plate (44) is provided with a V-shaped groove (441), and the axis of the ball screw (42) coincides with the axis of the lathe spindle.

3. The generator rotor shaft machining fixture according to claim 1, characterized in that: The ball screw (42) is fixedly connected to a straightening ring (45) at one end near the lathe spindle. The straightening ring (45) is connected to a plurality of balls (451) at one end near the lathe spindle, and the balls (451) are arranged in a ring array.

4. The generator rotor shaft machining fixture according to claim 3, characterized in that: The outer wall of the ball screw (42) is threaded with a ball sleeve (41) for supporting the ball screw (42).

5. A generator rotor shaft machining fixture according to claim 1, characterized in that: The bottom of the slide (1) is provided with a groove for adapting to the sliding of the linear guide rail of the lathe. The slide (1) is slidably connected to the linear guide rail through the groove.

6. A generator rotor shaft machining fixture according to claim 1, characterized in that: The support assembly (3) includes a support platform (31), which is located above the slide (1). The top of the support platform (31) is provided with a slide groove (32), and the inner wall of the slide groove (32) is rotatably connected to a threaded rod (33). The top of the support platform (31) is slidably connected to a slide table (34), and the bottom of the slide table (34) is threadedly connected to the threaded rod (33). The outer wall of the support platform (31) is rotatably provided with a knob (35) for driving the threaded rod (33) to rotate. The top of the slide table (34) is fixedly connected to a ball bearing sleeve (41).

7. A generator rotor shaft machining fixture according to claim 6, characterized in that: A first electric cylinder (2) is fixedly connected between the top of the slide (1) and the support platform (31) for adjusting the height of the support platform (31).

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