Motor shaft rotation coaxial degree test tool

Abstract

The utility model discloses a motor shaft rotation coaxial degree test frock relates to motor shaft test technical field, including work table, pivot and transmission assembly, and is fixed with fixed block on work table, and the movable block sliding connection with horizontal is established on work table, and the movable block is radially sliding connection with a plurality of clamping blocks in the end of being close to fixed block, and the pivot rotation is connected in the fixed block, and the movable block horizontal sliding sleeve is connected on the pivot, when the process of pivot rotation, through transmission assembly drive each clamping block on fixed block and movable block and is along radial synchronous close or away. This motor shaft rotation coaxial degree test frock movable block moves to fixed block, then when the end of movable block and fixed block and is close respectively with the both ends of the shaft abutment and fit, pivot rotates, through transmission assembly drive each clamping block on fixed block and movable block and is along radial synchronous close, realizes to the both ends of the shaft synchronous clamping centering, can adapt to the centering clamping of the shaft of different diameter size and length.

Description

Technical Field

[0001] This utility model relates to the field of motor shaft testing technology, specifically a tooling for testing the coaxiality of motor shaft rotation. Background Technology

[0002] The motor shaft is one of the most critical components of a motor, primarily used for power transmission and load bearing. It is typically made of high-strength metal materials such as steel, copper, and aluminum. Coaxiality testing of the motor shaft is an essential process in motor manufacturing and maintenance. Coaxiality is a crucial indicator in the design and production of motor shafts; it refers to the difference in offset between the two end faces of the motor shaft. It directly affects the operating efficiency and performance of the motor shaft. If coaxiality issues exist, it can lead to problems such as excessive motor noise and severe vibration. Therefore, coaxiality testing of the raw materials for the motor shaft is necessary during the production process.

[0003] For example, Chinese Patent CN117906476A, entitled "A Device for Detecting the Coaxiality of the Inner Hole of a Motor Shaft," includes: a base and a V-shaped clamp; a rolling electric push rod fixedly connected to the base; an inner roller motor rotatably connected to the output end of the rolling electric push rod; a roller sleeved on the outer side of the inner roller motor; a height detection mechanism on the base; and a height adjustment mechanism on the base. This invention detects the diameter of the motor shaft using a first mounting block, a rotating block, and a measuring ruler. Then, a second mounting block is moved upwards by a distance equal to the upward movement of the first mounting block plus the radius of the motor shaft. This ensures that the detection rod on the second mounting block is at the same horizontal level as the axis of the motor shaft, eliminating the need for manual adjustment. Furthermore, this invention is applicable to motor shafts of different specifications and allows for adjustment of motor shafts of varying sizes.

[0004] While the coaxiality detection device for the inner hole of a motor shaft in the aforementioned patent is practical and convenient, it also has shortcomings. In the prior art, when clamping and fixing the motor shaft, both ends of the motor shaft are clamped and centered separately. First, one end of the shaft is clamped and initially aligned, and then the other end of the shaft is clamped and aligned. This process may require repeated fine adjustments, which reduces work efficiency. Moreover, when aligning separately, the shaft is actually prone to forced twisting and is in a state of stress. Utility Model Content

[0005] The purpose of this invention is to provide a testing fixture for the coaxiality of a motor shaft rotation, in order to overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: The motor shaft rotation coaxiality testing fixture includes a worktable, a rotating shaft, and a transmission assembly. A fixed block is fixedly mounted on the worktable, and a movable block is horizontally slidably connected to the worktable. Multiple clamping blocks are radially slidably connected to the ends of the fixed block and the movable block that are close to each other. The rotating shaft is rotatably connected inside the fixed block, and the movable block is horizontally slidably sleeved on the rotating shaft. When the rotating shaft rotates, the transmission assembly drives the clamping blocks on the fixed block and the movable block to move closer or further away radially in sync.

[0007] Furthermore, multiple guide grooves are radially provided at the ends of the fixed block and the moving block that are close to each other, and each clamping block is slidably connected in each guide groove.

[0008] Furthermore, a second gear is rotatably connected to both the fixed block and the moving block. Multiple oblique sliding holes are arranged in a circumferential array on both second gears. A cylinder is slidably fitted into each oblique sliding hole, and each cylinder is fixedly connected to each clamping block in a one-to-one correspondence.

[0009] Furthermore, the transmission assembly includes two first gears, which are rotatably connected to a fixed block and a movable block, respectively. The two first gears are meshed with two second gears in a one-to-one correspondence. A protrusion is fixedly connected to the circumferential side of the rotating shaft. The rotating shaft and the protrusion are coaxially mounted on the first gear in the fixed block. The first gear in the movable block is slidably sleeved on the rotating shaft. A through hole is opened on the first gear in the movable block. The protrusion is slidably connected to the first gear in the movable block through the through hole.

[0010] Furthermore, a horizontal groove is formed on the worktable, a screw is rotatably connected in the groove, a slider is slidably connected in the groove, the slider is screwed to the screw, and the top of the slider is fixedly connected to the bottom of the moving block.

[0011] Compared with the prior art, the beneficial effects provided by this utility model are as follows: the moving block of the motor shaft rotation coaxiality testing fixture moves toward the fixed block, and then when the end of the moving block and the fixed block that are close to each other abut against the two ends of the shaft respectively, the shaft rotates, and the clamping blocks on the fixed block and the moving block are driven by the transmission component to move toward each other radially in sync, so as to realize the synchronous clamping and centering of the two ends of the shaft. It can adapt to the centering and clamping of shafts with different diameters and lengths, eliminates the tedious steps of repeated alignment and back-and-forth adjustment, greatly shortens the clamping time, and avoids shaft twisting. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0013] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0014] Figure 2 for Figure 1 Enlarged view of point C in the middle;

[0015] Figure 3 Top view of the overall structure provided for an embodiment of this utility model;

[0016] Figure 4 for Figure 3 Sectional view at point AA;

[0017] Figure 5 for Figure 4 Sectional view at point BB;

[0018] Figure 6 This is a partial structural diagram provided for an embodiment of the present utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Worktable; 2. Fixed block; 3. Moving block; 4. First gear; 5. Rotating shaft; 6. Second gear; 7. Slanted sliding hole; 8. Cylinder; 9. Clamping block; 10. Slider; 11. Screw; 12. Slide groove; 13. Guide groove; 14. Protrusion; 15. Driving component. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Please see Figure 1-6The present invention provides a technical solution: a motor shaft rotation coaxiality testing fixture, comprising a worktable 1, a rotating shaft 5, and a transmission assembly. A fixed block 2 is fixedly mounted on the worktable 1, and a moving block 3 is horizontally slidably connected to the worktable 1. Multiple clamping blocks 9 are radially slidably connected to the ends of the fixed block 2 and the moving block 3. The rotating shaft 5 is rotatably connected inside the fixed block 2, and the moving block 3 is horizontally slidably sleeved on the rotating shaft 5. During the rotation of the rotating shaft 5, the transmission assembly drives the clamping blocks 9 on the fixed block 2 and the moving block 3 to move closer or further away radially synchronously. Specifically, after clamping the fixed shaft, two dial indicators that are symmetrically positioned vertically can be moved to perform coaxiality testing on the shaft. The probes of the two dial indicators are slightly pressed on the shaft being tested. The changes in the readings of the two dial indicator pointers are observed and recorded, the reading error is calculated, and coaxiality error is detected. Alternatively, an external robotic arm can be connected to drive the dial indicators to rotate around the shaft to perform coaxiality testing.

[0022] In this embodiment, multiple guide grooves 13 are radially provided at the ends of the fixed block 2 and the moving block 3 that are close to each other. Each clamping block 9 is slidably connected in each guide groove 13. Specifically, the radially provided guide grooves 13 guide the movement direction of each clamping block 9 at the ends of the fixed block 2 and the moving block 3 that are close to each other, so that each clamping block 9 can move radially to clamp and center the two ends of the motor shaft.

[0023] In this embodiment, a second gear 6 is rotatably connected to both the fixed block 2 and the moving block 3. Multiple oblique sliding holes 7 are arranged in a circular array on both second gears 6. A cylinder 8 is slidably fitted into each oblique sliding hole 7. Each cylinder 8 is fixedly connected to each clamping block 9 in a one-to-one correspondence. Specifically, the two second gears 6 are driven to rotate synchronously by a transmission assembly, causing the position of the oblique sliding holes 7 to change accordingly. Since the oblique sliding holes 7 are inclined, they force the cylinder 8 to move along the trajectory of the guide groove 13. The movement of the cylinder 8 is decomposed into two component forces in two directions. The radial and tangential forces are both effective. However, since the clamping block 9 is limited by the radial guide groove 13, the tangential force is offset by the constraint of the guide groove 13 (i.e., the clamping block 9 cannot move tangentially). Only the radial force is effective. Therefore, the sliding of the cylinder 8 in the inclined sliding hole 7 directly drives the clamping block 9 to move along the radial guide groove 13, thereby enabling the clamping and centering of both ends of the motor shaft. On the one hand, it saves the operation time of clamping and centering. On the other hand, it forcibly ensures that the centers of the two clamping points remain consistent during the operation, preventing forced twisting of the shaft.

[0024] In this embodiment, the transmission assembly includes two first gears 4, which are rotatably connected to the fixed block 2 and the movable block 3, respectively. The two first gears 4 are meshed with two second gears 6 in a one-to-one correspondence. A protrusion 14 is fixedly connected to the circumferential side of the rotating shaft 5. The rotating shaft 5 and the protrusion 14 are coaxially mounted on the first gears 4 in the fixed block 2. The first gear 4 in the movable block 3 is slidably sleeved on the rotating shaft 5. A through hole is provided on the first gear 4 in the movable block 3, and the protrusion 14 is slidably connected to the first gear 4 in the movable block 3 through the through hole. Specifically, a driving component 15 is fixedly provided on one side of the fixed block 2. The driving component 15 includes a motor, and the output end of the motor is connected to the rotating shaft 5. One end of the shaft is coaxially fixedly connected, and the first gear 4 inside the movable block 3 slides along the length of the convex strip 14. When the two ends of the shaft abut against the ends of the fixed block 2 and the movable block 3 respectively, the shaft 5 is rotated synchronously with the convex strip 14, which in turn drives the first gear 4 inside the fixed block 2 to rotate. The convex strip 14 forces the first gear 4 inside the movable block 3 to rotate synchronously through the through hole, so that the two second gears 6 rotate synchronously, forcing them to open and close at the same speed and displacement, thereby achieving synchronous clamping and centering of the two ends of the shaft. This can adapt to the centering and clamping of shafts of different diameters, eliminating the tedious steps of repeated alignment and adjustment, and greatly shortening the clamping time.

[0025] In this embodiment, a horizontal groove 12 is provided on the workbench 1. A screw 11 is rotatably connected in the groove 12, and a slider 10 is slidably connected in the groove 12. The slider 10 is screwed to the screw 11, and the top of the slider 10 is fixedly connected to the bottom of the moving block 3. Specifically, one end of the screw 11 is externally connected to a motor, which drives the screw 11 to rotate. Since the groove 12 restricts the axial rotation of the slider 10, the slider 10 is driven by the helical transmission of the screw 11 to move the moving block 3 horizontally towards the fixed block 2, which can adapt to the clamping and centering of shafts of different lengths.

[0026] It should also be noted that the specific models and specifications of the motor, dial indicator, and robotic arm need to be selected and determined according to the actual specifications of the device, so their control methods and wiring layout will not be described in detail.

[0027] Working principle: The coaxiality testing fixture for the motor shaft first rotates the screw 11, which drives the moving block 3 towards the fixed block 2 through the screw 11's helical transmission. Then, when the end of the moving block 3 that is close to the fixed block 2 abuts against both ends of the shaft, the motor is started to drive the rotating shaft 5 and the convex strip 14 to rotate. At the same time, it drives the first gear 4 in the fixed block 2 to rotate. The convex strip 14 forces the first gear 4 in the moving block 3 to rotate synchronously through the through hole, so that the two second gears 6 rotate synchronously, forcing them to open and close at the same speed and displacement, thus achieving synchronous clamping and centering of both ends of the shaft. It can adapt to the centering and clamping of shafts of different diameters and lengths, eliminating the tedious steps of repeated alignment and adjustment, and greatly shortening the clamping time. After clamping and fixing the shaft, two dial indicators that are symmetrically positioned can be moved to test the coaxiality of the shaft.

[0028] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fixture for testing the coaxiality of a motor shaft rotation, comprising a worktable (1), a fixed block (2) fixedly disposed on the worktable (1), a movable block (3) horizontally slidably connected to the worktable (1), and a plurality of clamping blocks (9) radially slidably connected to the ends of the fixed block (2) and the movable block (3) near each other, characterized in that, Also includes: A rotating shaft (5) is rotatably connected inside a fixed block (2), and a moving block (3) is horizontally slidably sleeved on the rotating shaft (5). The transmission assembly drives the clamping blocks (9) on the fixed block (2) and the moving block (3) to move synchronously toward or away from each other in the radial direction during the rotation of the rotating shaft (5).

2. The motor shaft rotation coaxiality testing fixture according to claim 1, characterized in that, The fixed block (2) and the moving block (3) are each provided with a plurality of guide grooves (13) in a radial direction at the end that is close to each other, and each clamping block (9) is slidably connected in each guide groove (13).

3. The motor shaft rotation coaxiality testing fixture according to claim 2, characterized in that, Both the fixed block (2) and the moving block (3) are rotatably connected to a second gear (6). Both second gears (6) are provided with multiple oblique sliding holes (7) in a circular array. Each oblique sliding hole (7) is slidably fitted with a cylinder (8). Each cylinder (8) is fixedly connected to each clamping block (9) in a one-to-one correspondence.

4. The motor shaft rotation coaxiality testing fixture according to claim 1, characterized in that, The transmission assembly includes two first gears (4), which are rotatably connected in the fixed block (2) and the moving block (3) respectively. The two first gears (4) are meshed with the two second gears (6) in a one-to-one correspondence. A protrusion (14) is fixedly connected to the circumferential side of the rotating shaft (5). The rotating shaft (5) and the protrusion (14) are coaxially mounted on the first gear (4) in the fixed block (2). The first gear (4) in the moving block (3) is slidably sleeved on the rotating shaft (5). A through hole is opened on the first gear (4) in the moving block (3). The protrusion (14) is slidably connected to the first gear (4) in the moving block (3) through the through hole.

5. The motor shaft rotation coaxiality testing fixture according to claim 1, characterized in that, A slide groove (12) is horizontally opened on the workbench (1). A screw (11) is rotatably connected in the slide groove (12). A slider (10) is slidably connected in the slide groove (12). The slider (10) is screwed to the screw (11). The top of the slider (10) is fixedly connected to the bottom of the moving block (3).

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