A machining fixture for a composite material transmission shaft

Abstract

The utility model belongs to transmission shaft processing fixture technical field especially relates to a kind of processing fixture of composite material transmission shaft, it include: bottom plate, the bottom plate top two sides symmetry fixedly connected with support column, two The support column is fixedly connected with outer ring, two The inner ring is fixedly connected with the outer ring inside through connecting block, and inner ring and outer ring concentric arrangement;Self-centering clamping mechanism, the self-centering clamping mechanism includes three pusher column that equidistance sliding penetrates corresponding outer ring. The utility model is through three equidistance distribution pusher column and the self-centering clamping mechanism of the pressure wheel structure, cooperation drive mechanism realizes pusher column synchronous radial movement, can from circumferential even exert clamping force, effectively improve the problem that existing fixture self-centering effect is not good, clamping force distribution is uneven, avoid transmission shaft clamping deviation, simultaneously through the rotation assembly directly driven transmission shaft rotation with the transmission connection of pressure wheel, adapt to the rotation demand in processing process.

Description

Technical Field

[0001] This utility model belongs to the field of transmission shaft machining fixture technology, and particularly relates to a machining fixture for composite material transmission shafts. Background Technology

[0002] Composite material drive shafts are increasingly widely used in related mechanical fields due to their excellent comprehensive performance. The processing of these shafts places strict requirements on the self-centering accuracy, clamping stability, and adaptability of the clamping fixtures.

[0003] In the fixtures used for assembling drive shafts, no debris is generated during the assembly process, but there are still problems such as poor self-centering effect and uneven clamping force distribution, which can easily lead to drive shaft clamping deviation or damage to the surface of composite materials, affecting assembly accuracy. At the same time, there is a lack of rotary transmission structures adapted to the clamping mechanism, which makes it difficult to meet the process requirements for workpiece rotation during drive shaft assembly, thus limiting the improvement of assembly efficiency and finished product quality.

[0004] There is an urgent need for improvement, so we propose a machining fixture for composite material drive shafts. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned technical problems by providing a machining fixture for composite material drive shafts, which improves self-centering effect and clamping stability, and adapts to machining rotation requirements.

[0006] In view of this, the present invention provides a machining fixture for composite material drive shafts, comprising: The base plate has symmetrical support columns fixedly connected to both sides of its top. Each of the two support columns is fixedly connected to an outer ring. Each of the two outer rings is fixedly connected to an inner ring through a connecting block. The inner ring and the outer ring are concentrically arranged. The self-centering clamping mechanism includes three push columns that slide through the corresponding outer ring at equal intervals. One end of each of the three push columns slides through the inner ring on the same side and extends to the inner side of the inner ring. The ends of the push columns on the inner side of the inner ring are rotatably connected to pressure rollers. The drive mechanism is located between the outer ring on the same side and the side end of the corresponding push column, and is used to drive the three push columns on the same side to move radially synchronously so as to realize the self-centering clamping and positioning of the transmission shaft. The rotating component is mounted on any one of the three push columns on the same side, and its drive end is connected to the corresponding pressure wheel drive.

[0007] Furthermore, the driving mechanism includes a gear ring disposed on the inner wall of the outer ring, connecting plates fixedly connected to both ends of the outer ring, and several teeth fixedly connected to one side of the push column. A gear is rotatably connected between the two connecting plates, and the gear meshes with the gear ring and the teeth respectively. A through hole is provided on each of the three connecting blocks. After the gear ring rotates through the through hole, it is rotatably connected to the inner wall of the outer ring. A drive motor is fixedly connected to the connecting plate, and the drive end of the drive motor rotates through the connecting plate and connects to the center of the gear.

[0008] Furthermore, the rotating assembly includes a worm gear fixedly connected to the center of the corresponding pressure roller. Two mounting plates are fixedly connected to the surface of the push column on one side of the worm gear. A worm is rotatably connected between the two mounting plates, and the worm meshes with the worm gear.

[0009] Furthermore, a T-shaped guide groove is provided at the end of the push column away from the teeth, and a T-shaped guide block is slidably connected in the guide groove, and the guide block is fixedly connected to the inner side of the overlap between the push column and the outer ring.

[0010] Furthermore, the helix angle of the worm is less than or equal to the equivalent friction angle.

[0011] Furthermore, one end of the worm gear rotates through the mounting plate and extends to the outside of the mounting plate, and a handwheel is fixedly connected to the worm gear end face on the outside of the mounting plate.

[0012] Furthermore, an anti-slip pad is fixedly connected to the outer peripheral wall of the pressure roller.

[0013] The beneficial effects of this utility model are: This application utilizes a self-centering clamping mechanism consisting of three equidistantly distributed push columns and pressure rollers, which, in conjunction with a drive mechanism, enables synchronous radial movement of the push columns. This allows for uniform application of clamping force in the circumferential direction, effectively improving the problems of poor self-centering effect and uneven clamping force distribution in existing fixtures. It also prevents the drive shaft from shifting during clamping. Furthermore, the rotating component connected to the pressure roller drive directly drives the drive shaft to rotate, adapting to the rotational requirements during the machining process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a machining fixture for a composite material drive shaft proposed in this utility model; Figure 2 This is a schematic diagram of the connection structure between the outer ring and inner ring and the self-centering clamping mechanism of a machining fixture for a composite material drive shaft proposed in this utility model. Figure 3 This is a cross-sectional view of the connection between the push column and the outer and inner rings of a machining fixture for a composite material drive shaft proposed in this utility model. Figure 4This is a schematic diagram of the drive mechanism structure of a machining fixture for a composite material drive shaft proposed in this utility model.

[0015] The markings in the diagram are as follows: 1. Base plate; 2. Support column; 3. Outer ring; 4. Inner ring; 5. Connecting block; 6. Gear ring; 7. Push column; 8. Pressure roller; 9. Connecting plate; 10. Gear; 11. Drive motor; 12. Worm gear; 13. Mounting plate; 14. Worm; 15. Handwheel; 16. Perforation; 17. Guide groove; 18. Guide block; 19. Anti-slip pad; 20. Tooth. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0018] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0019] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0020] It should be noted that, in this application, 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0021] Reference Figures 1 to 4 A machining fixture for composite material drive shafts, comprising: The base plate 1 has support columns 2 symmetrically fixedly connected to the top two sides of the base plate 1. Each of the two support columns 2 is fixedly connected to an outer ring 3. The inner sides of the two outer rings 3 are fixedly connected to an inner ring 4 through a connecting block 5, and the inner ring 4 is concentric with the outer ring 3. The self-centering clamping mechanism includes three push columns 7 that slide through the corresponding outer ring 3 at equal intervals. One end of each of the three push columns 7 slides through the inner ring 4 on the same side and extends to the inside of the inner ring 4. The ends of the push columns 7 on the inner side of the inner ring 4 are rotatably connected to pressure rollers 8. The drive mechanism is located between the outer ring 3 on the same side and the side end of the corresponding push column 7, and is used to drive the three push columns 7 on the same side to move radially synchronously so as to realize the self-centering clamping and positioning of the transmission shaft. The rotating component is mounted on any one of the three push columns 7 on the same side, and its driving end is connected to the corresponding pressure roller 8.

[0022] This application utilizes a self-centering clamping mechanism with three equidistantly distributed push columns 7 working in conjunction with a pressure roller 8 on the inner side of the inner ring 4. Combined with a drive mechanism, the three push columns 7 move radially synchronously, applying clamping force evenly in the circumferential direction. This effectively solves the problems of poor self-centering effect and uneven clamping force distribution in existing fixtures, and avoids drive shaft clamping deviation. At the same time, it is equipped with a rotating component that is connected to the pressure roller 8 for transmission, which can directly drive the clamped drive shaft to rotate, accurately meeting the process requirements for workpiece rotation during processing, and overcoming the limitation of existing fixtures lacking a suitable rotary transmission structure.

[0023] In the example of this application, the drive mechanism includes a toothed ring 6 disposed on the inner wall of the outer ring 3, connecting plates 9 fixedly connected to both ends of the outer ring 3, and a plurality of teeth 20 fixedly connected to one side of the push column 7. The toothed ring 6 is rotatably connected to the inner wall of the outer ring 3 through bearings. A gear 10 is rotatably connected between the two connecting plates 9. The gear 10 meshes with the toothed ring 6 and the teeth 20 respectively. A through hole 16 is provided on each of the three connecting blocks 5. After the toothed ring 6 rotates through the through hole 16, it is rotatably connected to the inner wall of the outer ring 3. A drive motor 11 is fixedly connected to the connecting plate 9. The drive end of the drive motor 11 rotates through the connecting plate 9 and connects to the center of the gear 10.

[0024] As a preferred example of this utility model, the drive mechanism adopts a meshing transmission structure of a gear ring 6, a gear 10, and the teeth 20 on the side of the push column 7. The gear ring 6 rotates with the inner wall of the outer ring 3 through the through hole 16 on the connecting block 5. The gear 10 is stably supported by the connecting plate 9. The drive motor 11 drives the gear 10 to rotate in both directions (how the motor rotates in both directions is a known technology, so it will not be described in detail). This makes the power transmission uniform and highly synchronized during the transmission process, ensuring that the movement trajectory of the three push columns 7 is consistent, further improving the accuracy of self-centering clamping. The setting of the gear ring 6 through the connecting block 5 not only ensures its own rotational flexibility but also avoids interference with the connecting block 5, making the drive process smoother and improving the reliability of the overall structure.

[0025] In the example of this application, the rotating component includes a worm gear 12 fixedly connected to the center of the corresponding pressure roller 8. Two mounting plates 13 are fixedly connected to the surface of the push column 7 on one side of the worm gear 12. A worm 14 is rotatably connected between the two mounting plates 13, and the worm 14 meshes with the worm gear 12.

[0026] As a preferred example of this utility model, the rotating assembly adopts a transmission method in which a worm gear 12 and a worm 14 mesh. The worm gear 12 is fixed at the center of the pressure roller 8, and the worm 14 is stably supported by the mounting plate 13. During the transmission process, the torque is transmitted smoothly and the speed is precisely adjusted, which can drive the pressure roller 8 to drive the transmission shaft to rotate smoothly. This solves the problem of poor adaptability of the existing fixture rotation transmission structure. The structural characteristics of the worm gear 12 and worm 14 transmission can achieve the effect of speed reduction and torque increase, making the transmission shaft rotate more smoothly, avoiding workpiece vibration caused by high-speed rotation, and improving machining accuracy.

[0027] In the example of this application, a T-shaped guide groove 17 is provided at the end of the push post 7 away from the tooth 20. A T-shaped guide block 18 is slidably connected in the guide groove 17, and the guide block 18 is fixedly connected to the inner side of the overlap between the push post 7 and the outer ring 3.

[0028] As a preferred example of this utility model, the T-shaped guide groove 17 on the push column 7 is slidably engaged with the T-shaped guide block 18 on the inner side of the outer ring 3. When the push column 7 moves radially, the T-shaped structure can restrict the degree of freedom of the push column 7, allowing it to slide smoothly in the radial direction only. The guide block 18 is fixed to the outer ring 3 and fits against the inner side of the push column 7, which can ensure that the three push columns 7 always maintain equidistant synchronous movement, further enhancing the accuracy of self-centering clamping, avoiding the imbalance of clamping force caused by the offset of the push column 7, and improving the overall stability of the fixture.

[0029] In the example of this application, the helix angle of the worm 14 is less than or equal to the equivalent friction angle.

[0030] As a preferred example of this utility model, the setting of the helix angle of the worm 14 being less than or equal to the equivalent friction angle enables the worm gear 12 and worm 14 transmission to have a self-locking function. When the worm 14 stops driving, the worm gear 12 will not reverse due to the reaction force of the transmission shaft or external disturbances, and can firmly lock the rotational position of the pressure roller 8 and the transmission shaft. This effectively solves the problem of easy displacement of the workpiece rotational position during processing, and ensures that the transmission shaft always maintains a stable rotational posture or fixed angle during processing, avoiding processing errors caused by reverse rotation.

[0031] In the example of this application, one end of the worm gear 14 rotates through the mounting plate 13 and extends to the outside of the mounting plate 13, and a handwheel 15 is fixedly connected to the end face of the worm gear 14 on the outside of the mounting plate 13.

[0032] As a preferred example of this utility model, the worm gear 14 can be driven to rotate by manually turning the handwheel 15, which in turn drives the worm wheel 12 and the pressure wheel 8 to rotate. The operation is intuitive and convenient, and no additional complex power equipment is required.

[0033] In the example of this application, an anti-slip pad 19 is fixedly connected to the outer peripheral wall of the pressure roller 8. The anti-slip pad 19 is made of polyurethane material and has a Shore A hardness of 85-95.

[0034] As a preferred example of this utility model, the anti-slip pad 19 made of polyurethane material is combined with a Shore A85-95 hardness setting. On the one hand, the elastic properties of polyurethane can disperse the clamping pressure through slight deformation, avoiding damage such as scratches and indentations on the surface of the composite material drive shaft caused by hard contact. This effectively solves the problem of workpiece surface damage caused by the lack of suitable protective structure in existing fixtures. On the other hand, the high hardness of Shore A85-95 gives the anti-slip pad 19 low creep performance. It will not undergo permanent deformation after long-term clamping or being subjected to force, and can always maintain its original shape, ensuring the accuracy of the fixed connection position of the drive shaft and avoiding workpiece positioning deviation caused by excessive deformation of the anti-slip pad 19. At the same time, the polyurethane material itself has an excellent coefficient of friction. Combined with a reasonable hardness, it can significantly improve the friction between the pressure roller 8 and the surface of the drive shaft, avoiding slippage during rotation processing, ensuring the transmission reliability of the rotating component driving the drive shaft to rotate, and further adapting to the rotation requirements in the processing process.

[0035] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A machining fixture for composite material drive shafts, characterized in that, include: The base plate (1) has support columns (2) symmetrically fixedly connected on both sides of the top of the base plate (1). Both support columns (2) are fixedly connected to outer rings (3). Both outer rings (3) are fixedly connected to inner rings (4) through connecting blocks (5). The inner rings (4) and outer rings (3) are concentrically arranged. The self-centering clamping mechanism includes three push columns (7) that slide through the corresponding outer ring (3) at equal intervals. One end of each of the three push columns (7) slides through the inner ring (4) on the same side and extends to the inner side of the inner ring (4). The ends of the push columns (7) on the inner side of the inner ring (4) are rotatably connected to pressure rollers (8). The drive mechanism is located between the outer ring (3) on the same side and the corresponding push column (7) side end, and is used to drive the three push columns (7) on the same side to move radially synchronously so as to realize the self-centering clamping and positioning of the transmission shaft; The rotating component is installed on any one of the three push columns (7) on the same side, and its driving end is connected to the corresponding pressure roller (8) for transmission.

2. The machining fixture for a composite material drive shaft according to claim 1, characterized in that, The driving mechanism includes a gear ring (6) disposed on the inner wall of the outer ring (3), a connecting plate (9) fixedly connected to both ends of the outer ring (3), and a number of teeth (20) fixedly connected to one side of the push column (7). A gear (10) is rotatably connected between the two connecting plates (9). The gear (10) meshes with the gear ring (6) and the teeth (20) respectively. A through hole (16) is provided on each of the three connecting blocks (5). The gear ring (6) rotates through the through hole (16) and is rotatably connected to the inner wall of the outer ring (3). A drive motor (11) is fixedly connected to the connecting plate (9). The drive end of the drive motor (11) rotates through the connecting plate (9) and connects to the center of the gear (10).

3. The machining fixture for a composite material drive shaft according to claim 1, characterized in that, The rotating assembly includes a worm gear (12) fixedly connected to the center of the corresponding pressure roller (8). Two mounting plates (13) are fixedly connected to the surface of the push column (7) on one side of the worm gear (12). A worm (14) is rotatably connected between the two mounting plates (13), and the worm (14) meshes with the worm gear (12).

4. The machining fixture for a composite material drive shaft according to claim 2, characterized in that, The push column (7) has a T-shaped guide groove (17) at one end away from the tooth (20). A T-shaped guide block (18) is slidably connected in the guide groove (17), and the guide block (18) is fixedly connected to the inner side of the overlap between the push column (7) and the outer ring (3).

5. The machining fixture for a composite material drive shaft according to claim 3, characterized in that, The helix angle of the worm (14) is less than or equal to the equivalent friction angle.

6. The machining fixture for a composite material drive shaft according to claim 3, characterized in that, One end of the worm (14) rotates through the mounting plate (13) and extends to the outside of the mounting plate (13). A handwheel (15) is fixedly connected to the end face of the worm (14) on the outside of the mounting plate (13).

7. The machining fixture for a composite material drive shaft according to claim 1, characterized in that, The outer peripheral wall of the pressure roller (8) is fixedly connected with an anti-slip pad (19).

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