Positioning device for key groove of input shaft of speed reducer

Abstract

The utility model belongs to the technical field of speed reducer input shaft positioning, and particularly relates to a positioning device for a speed reducer input shaft key groove, which comprises a base, a guide assembly is provided with a fixing plate, the fixing plate is provided with an arc-shaped groove, and the arc-shaped block is fixedly provided with a mounting frame through a connecting rod. The periphery of the fixing block is slidably sleeved with a positioning block, a sliding groove is formed in the positioning block, the fixing block is assembled in the sliding groove, a spring is installed between the inner wall of the sliding groove and the fixing block, a grating disc is installed on the outer wall of the annular plate, and the grating disc rotates around the center line of the input shaft through the positioning block; the spring pushes the positioning block to be clamped into the key groove, then the positioning block drives the input shaft to rotate, when the rotation angle is 90 degrees, the positioning block stops rotating, at the moment, the key groove rotates to the position over the input shaft, accurate positioning of the key groove is achieved, the positioning accuracy is improved, and the positioning efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer input shaft positioning technology, specifically a positioning device for the keyway of speed reducer input shaft. Background Technology

[0002] Keyed connection is a common fixing method in which a key is installed in the hole of the shaft and the gear to connect them. When keying the input shaft of the reducer to the gear, in order to improve the convenience of assembly, a keyway positioning device is required to ensure that the keyway is fixed in the correct position.

[0003] A Chinese patent with authorization announcement number CN 219986957 U discloses a positioning device for the keyway of a reducer input shaft, relating to the technical field of reducer production equipment, and aiming to solve the technical problem of angle positioning. Its key technical points are: it includes a base and a connecting seat; the surface of the base is provided with several vertical connecting rods; the connecting seat has a connecting groove that slides with the connecting rods; the surface of the base is provided with a first driving member for driving the connecting seat to rise and fall along the connecting rods; a positioning member is slidably connected to the surface of the connecting seat in the horizontal direction; and a second driving member is also included for driving the positioning member. The purpose of this utility model is to provide a positioning device for the keyway of a reducer input shaft.

[0004] Existing positioning devices struggle to accurately and conveniently locate the keyway angle during the positioning of the reducer input shaft, resulting in poor positioning accuracy and reduced positioning efficiency. Therefore, a positioning device for the keyway of the reducer input shaft is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve the problems existing in the existing technology, this utility model proposes a positioning device for the keyway of the input shaft of a speed reducer.

[0006] The technical solution adopted by this utility model to solve its technical problem is a positioning device for the keyway of the input shaft of a speed reducer, including a base, a control panel mounted on the base, a guide plate mounted on the base, a guide assembly mounted inside the guide plate, a fixing plate mounted on the guide assembly, an arc-shaped groove formed on the fixing plate, an arc-shaped block assembled in the arc-shaped groove, a mounting bracket fixedly mounted on the arc-shaped block by a connecting rod, an electric cylinder mounted on the mounting bracket, a fixing block fixedly connected to the actuating rod of the electric cylinder, a positioning block slidably sleeved around the fixing block, a sliding groove formed inside the positioning block, the fixing block assembled in the sliding groove, a spring installed between the inner wall of the sliding groove and the fixing block, a limit groove formed on the side wall of the positioning block, a limit block assembled in the limit groove, the limit block fixedly connected to the side wall of the fixing block, an annular plate mounted on the arc-shaped block, a grating disk mounted on the outer wall of the annular plate, and a mounting bracket mounted on the fixing plate. Equipped with a photodetector, a first motor is mounted on the fixed plate via a base. A small gear is mounted on the output shaft of the first motor, and an internal gear is mounted on the inner wall of the annular plate. The internal gear meshes with the small gear. A cavity is formed inside the grating disk, and a light source is installed inside the cavity. Multiple grating holes are formed on the outer wall of the grating disk. A positioning block rotates around the center line of the input shaft. When it rotates to the keyway, the spring pushes the positioning block into the keyway. Then, the positioning block drives the input shaft to rotate. During this process, the photodetector detects changes in the light signal of the grating disk. The control panel processes and decodes the signal output by the photodetector to deduce the rotation angle of the positioning block. When the rotation angle is 90°, the first motor stops operating, the positioning block stops rotating, and the keyway rotates to be directly above the input shaft, achieving precise positioning of the keyway, which is beneficial to improving positioning accuracy and efficiency.

[0007] Preferably, the guiding assembly includes a guide groove disposed within a first guide plate. A stepper motor is mounted on the side wall of the first guide plate via a base. A lead screw is mounted on the output shaft of the stepper motor. The lead screw is rotatably mounted on the inner wall of the guide groove. A guide block is assembled within the guide groove and is fixedly connected to a fixed plate. An mounting plate is mounted on the base. A movable groove is formed within the mounting plate. A double-ended screw is rotatably mounted on the inner wall of the movable groove. The threads on the double-ended screw are symmetrically opposite in direction. A knob is mounted on one end of the double-ended screw. Two movable blocks are symmetrically assembled within the movable groove. A clamping block is mounted on each movable block, and a clamping block is fixedly mounted within the clamping block. The device includes an electric telescopic rod, a reducer mounted on the base, and an input shaft mounted on the reducer. The input shaft has a keyway, and two clamping blocks clamp and limit its movement, ensuring the centerline of the input shaft is aligned with the device's baseline. At this point, the frictional resistance between the input shaft and the clamping blocks is low, allowing the input shaft to rotate for angle adjustment. After angle adjustment, the electric telescopic rod on the clamping blocks operates, and its actuator clamps and fixes the input shaft, achieving angle positioning and stability. This ensures the input shaft remains stable during subsequent assembly with gears, improving its overall stability.

[0008] The advantages of this utility model are:

[0009] 1. This utility model uses a positioning block that rotates around the center line of the input shaft. When it rotates to the keyway, the spring pushes the positioning block into the keyway. Then, the positioning block drives the input shaft to rotate. During this process, the photodetector detects the change in the light signal of the grating disk. The control panel processes and decodes the signal output by the photodetector to deduce the rotation angle of the positioning block. When the rotation angle is 90°, the first motor stops operating, the positioning block stops rotating, and the keyway rotates to be directly above the input shaft, achieving precise positioning of the keyway. This improves the accuracy and efficiency of positioning.

[0010] 2. This utility model uses two clamping blocks to clamp and limit the input shaft, ensuring that the center line of the input shaft is aligned with the reference line of the device. At this time, the frictional resistance between the input shaft and the clamping blocks is small, and the input shaft can rotate for angle adjustment. After the input shaft angle is adjusted, the electric telescopic rod on the clamping blocks operates, and the action rod on it clamps and fixes the input shaft, realizing the angle positioning of the input shaft and achieving the stability of the input shaft. During the subsequent assembly of the input shaft and gear, the input shaft can remain stable, which is beneficial to improving the stability of the input shaft. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a first-person perspective 3D structural diagram;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the guide plate.

[0014] Figure 3 This is a schematic diagram of the three-dimensional structure at the input shaft;

[0015] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the positioning block;

[0016] Figure 5 This is a schematic diagram of the three-dimensional structure of the fixed plate.

[0017] In the diagram: 1. Base; 2. Control panel; 3. Guide plate; 4. Guide groove; 5. Stepper motor; 6. Lead screw; 7. Guide block; 8. Fixing plate; 9. Arc groove; 10. Arc block; 11. Electric cylinder; 12. Fixing block; 13. Positioning block; 14. Slide groove; 15. Spring; 16. Limiting block; 17. Mounting plate; 18. Moving groove; 19. Double-ended screw; 20. Knob; 21. Moving block; 22. Clamping block; 23. Electric telescopic rod; 24. Reducer; 25. Input shaft; 26. Annular plate; 27. Grating disk; 28. Photodetector; 29. ​​First motor; 30. Pinion; 31. Internal gear; 32. Keyway. Detailed Implementation

[0018] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-5As shown, a positioning device for the keyway of a reducer input shaft includes a base 1, a control panel 2 mounted on the base 1, a guide plate 3 mounted on the base 1, a guide assembly mounted inside the guide plate 3, a fixing plate 8 mounted on the guide assembly, an arc-shaped groove 9 formed on the fixing plate 8, an arc-shaped block 10 assembled inside the arc-shaped groove 9, a mounting bracket fixedly mounted on the arc-shaped block 10 via a connecting rod, an electric cylinder 11 mounted on the mounting bracket, a fixing block 12 fixedly connected to the actuating rod of the electric cylinder 11, and a positioning block 13 slidably sleeved around the fixing block 12. A sliding groove 14 is formed inside the positioning block 13, and the fixing block 12 is assembled in the sliding groove 14. A spring 15 is installed between the inner wall of the sliding groove 14 and the fixing block 12. A limit groove is formed on the side wall of the positioning block 13, and a limit block 16 is assembled in the limit groove. The limit block 16 is fixedly connected to the side wall of the fixing block 12. An annular plate 26 is installed on the arc-shaped block 10, and a grating disk 27 is installed on the outer wall of the annular plate 26. A photoelectric detector 28 is installed on the fixing plate 8, and a first motor 29 is installed on the fixing plate 8 through a base. A pinion is installed on the output shaft of the first motor 29. 30. An internal gear 31 is installed on the inner wall of the annular plate 26. The internal gear 31 meshes with the pinion 30. A cavity is opened inside the grating disk 27, and a light source is installed in the cavity. Multiple grating holes are opened on the outer wall of the grating disk 27. During operation, the existing positioning device has difficulty in accurately and conveniently positioning the angle of the keyway 32 during the positioning of the input shaft 25 of the reducer 24, resulting in poor positioning accuracy and affecting positioning efficiency. By placing the reducer 24 on the base 1, two clamping blocks 22 clamp and limit the input shaft 25 on it. The positioning mechanism ensures that the center line of the input shaft 25 is aligned with the reference line of the device. Then, the stepper motor 5 operates, driving the lead screw 6 to rotate. The lead screw 6 drives the guide block 7 on it to move horizontally. The guide block 7 drives the fixing plate 8 to move horizontally, moving it to the reference line. This structure can be displaced to avoid affecting the assembly when the input shaft 25 is assembled with the gear. When the fixing plate 8 moves horizontally, it drives the positioning block 13 on it to move horizontally. When the fixing plate 8 moves to the reference line, the positioning block 13 will contact the input shaft 25, and the spring 15 inside it will be compressed.

[0020] The positioning block 13 can rotate within the arc groove 9, with a rotation angle of 90°. Therefore, before angular positioning of the input shaft 25, the keyway 32 on the input shaft 25 needs to be located within the arc groove 9. Then, the first motor 29 operates, driving the pinion 30 to rotate. The pinion 30 drives the internal gear 31 to rotate, which in turn drives the annular plate 26 to rotate. The annular plate 26 drives the arc block 10 to rotate within the arc groove 9. The arc block 10 drives the electric cylinder 11 to rotate, which in turn drives the fixed block 12 to rotate. The fixed block 12 drives the positioning block 13 to rotate, and the positioning block 13 rotates around the center line of the input shaft 25. When it rotates to the keyway 32, under the thrust of the spring 15, the spring 15 pushes the positioning block 13 into the keyway 32. Then, the positioning block 13 drives the input shaft 25 to rotate. During this process, the annular plate 26 simultaneously drives the grating disk 27 to rotate. The grating disk 27 is equipped with a light source. The photodetector 28 is model KG-PR-11M-B. The light source and the photodetector 28 are located on both sides of the grating hole. The light passes through the grating hole and is received by the photodetector 28. The photodetector 28 detects the change in the light signal of the grating disk 27 and sends an electrical signal to the control panel 2. The control panel 2 processes and decodes the signal output by the photodetector 28 to deduce the rotation angle of the positioning block 13. When the rotation angle is 90°, the first motor 29 stops operating and the positioning block 13 stops rotating. At this time, the keyway 32 rotates to be directly above the input shaft 25, realizing the precise positioning of the keyway 32.

[0021] Then, the electric telescopic rod 23 on the clamping block 22 operates to clamp and fix the input shaft 25. After that, the electric cylinder 11 operates, and its actuating rod drives the fixing block 12 and the positioning block 13 to move vertically upward. The positioning block 13 separates from the keyway 32, and the fixing plate 8 moves horizontally in the opposite direction to return to its original position. This structure can accurately and conveniently position the angle of the keyway 32, which is conducive to improving the accuracy and efficiency of positioning.

[0022] Please see Figure 1As shown, the guiding assembly includes a guide groove 4, which is disposed within a first guide plate 3. A stepper motor 5 is mounted on the side wall of the first guide plate 3 via a base. A lead screw 6 is mounted on the output shaft of the stepper motor 5. The lead screw 6 is rotatably mounted on the inner wall of the guide groove 4. A guide block 7 is assembled within the guide groove 4 and is fixedly connected to a fixed plate 8. An mounting plate 17 is mounted on the base 1. A moving groove 18 is formed within the mounting plate 17. A double-ended screw 19 is rotatably mounted on the inner wall of the moving groove 18. The threads on the double-ended screw 19 are symmetrically opposite in direction. A knob 20 is mounted on one end of the double-ended screw 19. Two moving blocks 21 are symmetrically assembled within the moving groove 18. A clamping block 22 is mounted on the moving block 21. An electric telescopic rod 23 is fixedly mounted within the clamping block 22. A reducer 24 is placed on the base 1. An input shaft 25 is mounted on the reducer 24 and has a keyway 32. During operation, existing positioning devices have difficulty in stably fixing the input shaft 25 of the reducer 24, resulting in poor stability of the input shaft 25. By placing the reducer 24 on the base 1 and rotating the knob 20, the double-ended screw 19 is rotated. The double-ended screw 19 drives the two moving blocks 21 on it to move synchronously relative to each other. The two moving blocks 21 drive the two clamping blocks 22 to move synchronously relative to each other. The two clamping blocks 22 clamp and limit the input shaft 25 on it, ensuring that the center line of the input shaft 25 is aligned with the reference line of the device. At this time, the frictional resistance between the input shaft 25 and the clamping blocks 22 is small, and the input shaft 25 can rotate for angle adjustment. The double-ended screw 19 has self-locking property. When the thread helix angle is less than the friction angle, sliding friction will cause the double-ended screw 19 to self-lock, preventing the moving blocks 21 from driving the double-ended screw 19 in the opposite direction.

[0023] After the angle of the input shaft 25 is adjusted, the electric telescopic rod 23 on the clamping block 22 is operated, and the rod on it clamps and fixes the input shaft 25, thereby achieving the angular positioning of the input shaft 25 and realizing the stability of the input shaft 25. When the input shaft 25 is subsequently assembled with the gear, the input shaft 25 can remain stable, which is beneficial to improving the stability of the input shaft 25.

[0024] Working principle: Existing positioning devices struggle to accurately and conveniently position the keyway 32 angle during the positioning of the input shaft 25 of the reducer 24, resulting in poor positioning accuracy and reduced efficiency. By placing the reducer 24 on the base 1, two clamping blocks 22 clamp and limit the input shaft 25, ensuring the centerline of the input shaft 25 is aligned with the device's baseline. Then, the stepper motor 5 rotates the lead screw 6, which in turn moves the guide block 7 horizontally. The guide block 7 then moves the fixing plate 8 horizontally, bringing it to the baseline. This repositionable structure prevents interference with subsequent assembly of the input shaft 25 and gears. The horizontal movement of the fixing plate 8 also helps to move the guide block 7 horizontally. The positioning block 13 moves horizontally, and when the fixing plate 8 moves to the baseline, the positioning block 13 will contact the input shaft 25, and the spring 15 inside it will be compressed. The positioning block 13 can rotate within the arc groove 9, and the rotation angle is 90°. Therefore, before angular positioning of the input shaft 25, the keyway 32 on the input shaft 25 needs to be located within the arc groove 9. Then, the first motor 29 operates, driving the pinion 30 to rotate, the pinion 30 drives the internal gear 31 to rotate, the internal gear 31 drives the annular plate 26 to rotate, the annular plate 26 drives the arc block 10 to rotate within the arc groove 9, the arc block 10 drives the electric cylinder 11 to rotate, and the electric cylinder 11 drives the fixing block 12 to rotate. Fixed block 12 drives positioning block 13 to rotate. Positioning block 13 rotates around the center line of input shaft 25. When it rotates to keyway 32, under the thrust of spring 15, spring 15 pushes positioning block 13 into keyway 32. Then positioning block 13 drives input shaft 25 to rotate. During this process, annular plate 26 simultaneously drives grating disk 27 to rotate. Light source is installed inside grating disk 27. Photodetector 28 is model KG-PR-11M-B. Light source and photodetector 28 are located on both sides of grating hole. Light is received by photodetector 28 through grating hole. Photodetector 28 detects the change of light signal of grating disk 27 and sends electrical signal to control panel 2. Control panel 2 outputs to photodetector 28. The signal is processed and decoded to deduce the rotation angle of the positioning block 13. When the rotation angle is 90°, the first motor 29 stops operating, the positioning block 13 stops rotating, and the keyway 32 rotates to be directly above the input shaft 25, achieving precise positioning of the keyway 32. Then, the electric telescopic rod 23 on the clamping block 22 operates to clamp and fix the input shaft 25. After that, the electric cylinder 11 operates, and its action rod drives the fixing block 12 and the positioning block 13 to move vertically upward. The positioning block 13 separates from the keyway 32, and the fixing plate 8 moves horizontally in the opposite direction to return to its original position. This structure can accurately and conveniently position the angle of the keyway 32, which is beneficial to improving the accuracy and efficiency of positioning.Existing positioning devices struggle to stably fix the input shaft 25 of the reducer 24 during positioning, resulting in poor stability. By placing the reducer 24 on the base 1 and rotating the knob 20, the double-ended screw 19 rotates. The double-ended screw 19 drives two moving blocks 21 to move synchronously relative to each other. These two moving blocks 21, in turn, drive two clamping blocks 22 to move synchronously relative to each other. The two clamping blocks 22 clamp and limit the input shaft 25, ensuring that the centerline of the input shaft 25 is aligned with the device's reference line. At this point, the frictional resistance between the input shaft 25 and the clamping blocks 22 is minimal. The input shaft 25 can rotate for angle adjustment. The double-ended screw 19 is self-locking; when the thread helix angle is less than the friction angle, sliding friction causes the double-ended screw 19 to self-lock, preventing the moving block 21 from driving the double-ended screw 19 in the opposite direction. After the angle of the input shaft 25 is adjusted, the electric telescopic rod 23 on the clamping block 22 operates, and its actuator clamps and fixes the input shaft 25, achieving angular positioning and stability. This ensures the input shaft 25 remains stable during subsequent assembly with gears, thus improving its overall stability.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A positioning device for the keyway of a reducer input shaft, characterized in that: The system includes a base (1), a control panel (2) mounted on the base (1), a guide plate (3) mounted on the base (1), a guide assembly mounted inside the guide plate (3), a fixing plate (8) mounted on the guide assembly, an arc groove (9) formed on the fixing plate (8), an arc block (10) assembled inside the arc groove (9), a mounting bracket fixedly mounted on the arc block (10) via a connecting rod, an electric cylinder (11) mounted on the mounting bracket, a fixing block (12) fixedly connected to the actuating rod of the electric cylinder (11), and a fixed block (12) slidably sleeved around the fixing block (12). Positioning block (13), the positioning block (13) has a sliding groove (14) inside, the fixing block (12) is assembled in the sliding groove (14), a spring (15) is installed between the inner wall of the sliding groove (14) and the fixing block (12), a limiting groove is opened on the side wall of the positioning block (13), a limiting block (16) is assembled in the limiting groove, the limiting block (16) is fixedly connected to the side wall of the fixing block (12), an annular plate (26) is installed on the arc-shaped block (10), a grating disk (27) is installed on the outer wall of the annular plate (26), and a photodetector (28) is installed on the fixing plate (8).

2. The positioning device for the keyway of a reducer input shaft according to claim 1, characterized in that: A first motor (29) is mounted on the fixed plate (8) via a base, and a pinion (30) is mounted on the output shaft of the first motor (29).

3. A positioning device for the keyway of a reducer input shaft according to claim 1, characterized in that: An internal gear (31) is installed on the inner wall of the annular plate (26), and the internal gear (31) meshes with the pinion (30).

4. A positioning device for the keyway of a reducer input shaft according to claim 1, characterized in that: The grating disk (27) has a cavity inside, and a light source is installed inside the cavity. Multiple grating holes are opened on the outer wall of the grating disk (27).

5. A positioning device for a keyway on the input shaft of a speed reducer according to claim 1, characterized in that: The guiding assembly includes a guide groove (4), which is disposed in a first guide plate (3). A stepper motor (5) is mounted on the side wall of the first guide plate (3) via a base. A lead screw (6) is mounted on the output shaft of the stepper motor (5). The lead screw (6) is rotatably mounted on the inner wall of the guide groove (4). A guide block (7) is assembled in the guide groove (4). The guide block (7) is fixedly connected to a fixing plate (8).

6. A positioning device for a keyway on the input shaft of a speed reducer according to claim 1, characterized in that: A mounting plate (17) is installed on the base (1). A movable groove (18) is provided in the mounting plate (17). A double-headed screw (19) is rotatably installed on the inner wall of the movable groove (18). The threads on the double-headed screw (19) are symmetrically opposite. A knob (20) is installed at one end of the double-headed screw (19). Two movable blocks (21) are symmetrically assembled in the movable groove (18). A clamping block (22) is installed on the movable block (21). An electric telescopic rod (23) is fixedly installed in the clamping block (22). A reducer (24) is placed on the base (1). An input shaft (25) is installed on the reducer (24). A keyway (32) is provided on the input shaft (25).

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