Coaxiality detection device for motor shaft

Abstract

The invention discloses a motor shaft coaxiality detection device, and relates to the field of motor shaft coaxiality detection.The motor shaft coaxiality detection device comprises a base, a test motor is placed on the base, an output shaft is connected to the test motor, a supporting frame is arranged above the base, a connecting plate is installed above the supporting frame, and a movable seat is embedded in the outer side of the supporting frame; the middle of the movable seat is designed to be of an open structure, the output shaft penetrates through the middle of the movable seat, and a centering mechanism is arranged in the middle of the movable seat and used for centering and positioning the output shaft. According to the coaxiality detection device for the motor shaft, the output shaft of the tested motor is centered and positioned through the centering mechanism, the centering mode is not influenced by the appearance of the motor, the output shafts of the motors with different shapes can be positioned to the same position, the axes of the output shafts are kept consistent, and the coaxiality of the motor shaft is detected. And the position of the detection mechanism does not need to be adjusted, so that the device is more convenient to use.

Description

Technical Field

[0001] This invention relates to the field of motor shaft coaxiality detection technology, specifically to a device for detecting motor shaft coaxiality. Background Technology

[0002] When machining a motor, the coaxiality of the machined motor needs to be tested to determine whether the motor output shaft runs smoothly. If the coaxiality is poor, the motor will generate vibration and noise during subsequent operation, and in severe cases, it may even damage the equipment.

[0003] Prior art 1 (Chinese patent application number CN202411165064.7, published on January 28, 2025) discloses a device for detecting the coaxiality of the inner hole of a motor shaft, including a base, with support seats symmetrically fixedly installed on the left and right sides of the upper surface of the base, and a drive mechanism provided on the front side of the upper surface of the base. Support sleeves are fixedly sleeved on the upper parts of both support seats, and symmetrical clamping mechanisms are provided at the inner ends of the two support sleeves. The right clamping mechanism includes a clamping plate, which is fixedly installed on the left end of the right support sleeve. By activating the drive mechanism, the gear sleeve is driven to rotate at high speed. The inner inclined surface of the high-speed rotating gear sleeve slides rapidly along the clamping block towards the end away from the support sleeve, causing the clamping block to quickly pass over the high wear area of ​​the tapered sleeve. This allows the smallest wear area of ​​the tapered sleeve to replace the largest wear area, eliminating the error caused by wear at the contact part between the clamping block and the tapered sleeve. This solves the problems of reduced detection accuracy due to reduced clamping precision and the need for repositioning of the optical detection lens in existing detection devices; Prior art 2 (application number CN202411165064.7, published on January 28, 2025) discloses a device for detecting the coaxiality of the inner hole of a motor shaft, including a base, with support seats symmetrically fixed on the left and right sides of the upper surface of the base, and a drive mechanism provided on the front side of the upper surface of the base. Prior art 2 (application number CN202411165064.7, published on January 28, 2025) discloses a device for detecting the coaxiality of the inner hole of a motor shaft, including a base, with support seats symmetrically fixed on the left and right sides of the upper surface of the base, and a drive mechanism provided on the front side of the base. Prior art 2 (application number CN20241116 (Chinese Patent No. CN202420342953.5, published on April 29, 2025) A coaxiality detection mechanism, the key technical points of which are: a base plate, the bottom surface of which has a bottom groove, a first cylinder fixedly installed inside the bottom groove, a side platform provided on one side of the base plate, a top block provided on the top surface of the side platform, a mounting hole provided on one side of the top block, a laser rangefinder fixedly installed inside the mounting hole, and a top groove provided on the top surface of the side platform; in use, the motor to be tested is placed on the top surface of the base plate, and the position of the positioning ring can be adjusted up and down by means of the telescopic rod, the locking block and the locking groove, and then the positioning ring is sleeved with the rotor shaft to make the rotor shaft quickly centered. Then, by opening the second cylinder, the top block is moved up and down to make the laser rangefinder align with the rotor shaft for detection. The position of the laser rangefinder can be adjusted by opening the first cylinder and pushing the side rod. Anti-slip pads are provided to increase the stability of the motor to be tested after placement.

[0004] Current testing devices detect the coaxiality of motor shafts by starting the motor and controlling the shaft to rotate. However, the rotation center of the shaft is controlled by the motor. Since different motors have different external shapes, it is difficult to ensure that the output shaft position is constant when the motor is placed. When the center position of the output shaft changes, the corresponding testing mechanism must also be adjusted, which reduces the convenience of the device and its applicability to different motors. Summary of the Invention

[0005] The purpose of this invention is to provide a device for detecting the coaxiality of a motor shaft, in order to solve the problem mentioned in the background art that the current detection device detects the coaxiality of a motor shaft by starting the motor to control the shaft rotation. However, the rotation center of the shaft is controlled by the motor. Since different motors have different external shapes, it is difficult to ensure that the position of the output shaft is constant when the motor is placed. When the center position of the output shaft changes, the corresponding detection mechanism must also be adjusted accordingly.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for detecting the coaxiality of a motor shaft, comprising a base, on which a test motor is placed, and an output shaft connected to the test motor. A support frame is provided above the base, and a connecting plate is installed above the support frame. A movable seat is nested on the outer side of the support frame. The movable seat has an open structure in the middle, through which the output shaft passes. A centering mechanism is provided in the middle of the movable seat to center and position the output shaft. A connector is detachably connected above the output shaft, and a test head is provided above the connector. The side surface of the test head has an inclined structure, and the upper end of the test head has an annular design. A laser measuring device is installed below the connecting plate above the annular surface of the test head. The vertical center line of the connector and the vertical center line of the output shaft coincide with each other.

[0007] To further optimize this technical solution, an installation head is fixed below the test head, and a threaded connection is formed between the installation head and the connector head. A connection positioning mechanism is provided below the connector head.

[0008] To further optimize this technical solution, the connecting positioning mechanism includes a positioning block, a first spring, an adjusting sleeve, and a pressing groove; The positioning blocks are evenly distributed at the bottom of the connector, and the positioning blocks and the connector form a telescopic structure. A groove is provided at the bottom of the connector to mate with the output shaft. The first spring is located on the outside of the positioning block to provide thrust to the positioning block; An adjusting sleeve is fitted onto the outside of the connector, and a threaded connection is formed between the adjusting sleeve and the connector. The extrusion groove is located below the adjusting sleeve, and the inner wall of the extrusion groove has an inclined structure design.

[0009] To further optimize this technical solution, an auxiliary positioning mechanism is provided above the base to position the test motor.

[0010] To further optimize this technical solution, the auxiliary positioning mechanism includes a clamping plate and a control shaft; The clamps are set on the left and right sides of the test motor, and the clamps and the base form a horizontal sliding structure. The control shaft is rotatably mounted on the outer surface of the clamping plate, and a threaded connection is formed between the control shaft and the base.

[0011] To further optimize this technical solution, the centering mechanism includes a centering block, a control block, a second spring, a through slot, and a control mechanism; The central blocks are distributed at equal angles inside the movable seat; The control block is located outside the center block, and a horizontal sliding structure is formed between the control block and the movable seat; The second spring is located on the outside of the control block to provide thrust to the control block; A through slot is formed in the middle of the control block; The control mechanism, connected to the through slot, controls the movement of the control block.

[0012] To further optimize this technical solution, the control mechanism includes an extrusion block, a linkage ring, and a telescopic device; The extrusion block is set inside the through groove, and the extrusion block and the movable seat form an up-and-down sliding structure, and the surface of the extrusion block is designed with an inclined structure. The linkage ring is fixed above the extrusion block and synchronously controls the movement of multiple sets of extrusion blocks; The telescopic device is installed above the movable seat and is connected to the linkage ring to control the movement of the linkage ring.

[0013] To further optimize this technical solution, the centering block and the control block form a horizontal sliding structure, and a third spring is provided between the centering block and the control block to provide a movement buffer distance for the centering block.

[0014] To further optimize this technical solution, a motor stabilizing mechanism is provided below the extrusion block to position the test motor behind the centered output shaft.

[0015] To further optimize this technical solution, the motor stabilizing mechanism includes a lower pressure foot, a movable plate, and a fourth spring; The lower pressure foot is fixed below the extrusion block; The movable plate is located below the control block, and a horizontal sliding structure is formed between the movable plate and the movable seat. The support frame has a slot corresponding to the movable plate, and the inner end of the movable plate is designed with an inclined structure. The fourth spring, located on the outside of the movable plate, provides an inward thrust to the movable plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The output shaft of the test motor is centered and positioned by a centering mechanism. This centering method is not affected by the shape of the motor, so that the output shaft of motors with different shapes can be positioned in the same position, thus keeping the axis of the output shaft consistent. Subsequently, a laser measuring instrument is used to detect the rotation axis deviation without adjusting the position of the detection mechanism, making it more convenient to use.

[0017] The centering mechanism is located inside the movable seat, which can move vertically. After the motor is placed, the centering mechanism moves to the outside of the output shaft by moving the movable seat. The subsequent raising of the movable seat does not affect the placement and removal of the test motor, making the operation more flexible.

[0018] The connector, in conjunction with the test head, converts the rotational deviation of the output shaft into a positional change of the test head, thereby enabling the detection of coaxiality with the laser measuring instrument. Furthermore, the connector and the output shaft are detachable, allowing it to be subsequently installed on different output shafts for testing.

[0019] The output shaft and the connector can be detached. The output shaft drives the connector to rotate synchronously through the connection positioning mechanism. The test head on the connector can also be detached and replaced. Test heads with different upper surface sizes can be replaced to detect different error ranges, increasing the functionality of the device.

[0020] The test motor can be positioned by pressing down the pressure foot to keep its position stable. When the pressure foot and the test motor are in contact, the centering block will disengage from the output shaft, allowing the output shaft to move under the influence of shaft center deviation. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a side view of the structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the base of the present invention.

[0024] Figure 4 This is a three-dimensional structural diagram of the connector of the present invention.

[0025] Figure 5 This is a schematic diagram of the main cross-sectional structure of the connector of the present invention.

[0026] Figure 6 This is a top view of the movable seat structure of the present invention.

[0027] Figure 7 This is a schematic diagram of the movable seat structure of the present invention viewed from below.

[0028] Figure 8 This is a top-section schematic diagram of the movable seat structure of the present invention.

[0029] Figure 9 This is a schematic diagram of the main cross-sectional structure of the movable seat of the present invention.

[0030] Figure 10 This is a schematic diagram of the downward movement of the pressing foot in this invention.

[0031] In the diagram: 1. Base; 2. Test motor; 3. Output shaft; 4. Clamping plate; 5. Control shaft; 6. Support frame; 7. Connecting plate; 8. Movable seat; 9. Connector; 10. Test head; 11. Laser measuring instrument; 12. Mounting head; 13. Positioning block; 14. First spring; 15. Adjusting sleeve; 16. Extrusion groove; 17. Centering block; 18. Control block; 19. Second spring; 20. Through groove; 21. Extrusion block; 22. Linkage ring; 23. Telescopic device; 24. Third spring; 25. Lower pressure foot; 26. Movable plate; 27. Fourth spring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: The present invention provides the following technical solution: a device for detecting the coaxiality of a motor shaft, such as... Figure 1-3 As shown, the device includes a base 1, on which a test motor 2 is placed. An output shaft 3 is connected to the test motor 2. A support frame 6 is provided above the base 1, and a connecting plate 7 is installed above the support frame 6. A movable seat 8 is nested on the outside of the support frame 6. The movable seat 8 has an open structure in the middle. The output shaft 3 passes through the middle of the movable seat 8. A centering mechanism is provided in the middle of the movable seat 8 to center and position the output shaft 3. A connector 9 is detachably connected above the output shaft 3. A test head 10 is provided above the connector 9. The side surface of the test head 10 has an inclined structure. The upper end of the test head 10 has a circular design. A laser measuring instrument 11 is installed below the connecting plate 7 above the circular surface of the test head 10. The vertical center line of the connector 9 and the vertical center line of the output shaft 3 coincide with each other.

[0034] The test motor 2 can be placed on top of the base 1. Before placement, move the movable seat 8 upwards so that the output shaft 3 can be smoothly inserted. Figure 3As shown, the movable seat 8 is then moved downwards so that the output shaft 3 passes through the movable seat 8. The output shaft 3 is then centered and positioned. The connector 9 is then installed above the output shaft 3. Subsequently, the rotation of the output shaft is detected by the laser measuring instrument 11. If the axis deviates, the position of the upper surface of the side-viewing head 10 will change with the rotation, and the measurement distance of the laser measuring instrument 11 will change.

[0035] Example 2: Based on Example 1, as follows Figure 3-5 As shown, a mounting head 12 is fixed below the test head 10. The mounting head 12 and the connector head 9 form a threaded connection. A connection positioning mechanism is provided below the connector head 9. The connection positioning mechanism includes a positioning block 13, a first spring 14, an adjusting sleeve 15, and a pressing groove 16. The positioning blocks 13 are evenly distributed on the lower part of the connector head 9, and a telescopic structure is formed between the positioning blocks 13 and the connector head 9. A groove for docking with the output shaft 3 is provided below the connector head 9. The first spring 14 is located on the outside of the positioning blocks 13 to provide thrust to the positioning blocks 13. The adjusting sleeve... 15, sleeved on the outside of connector 9, and the adjusting sleeve 15 and connector 9 form a threaded connection. Extrusion groove 16 is opened below the adjusting sleeve 15, and the inner wall of the extrusion groove 16 is designed with an inclined structure. An auxiliary positioning mechanism is set above the base 1 to position the test motor 2. The auxiliary positioning mechanism includes a clamping plate 4 and a control shaft 5. The clamping plate 4 is set on the left and right sides of the test motor 2, and the clamping plate 4 and base 1 form a horizontal sliding structure. The control shaft 5 is rotatably mounted on the outer surface of the clamping plate 4, and the control shaft 5 and base 1 form a threaded connection.

[0036] After the output shaft 3 is positioned, the clamping plate 4 and both sides of the test motor 2 can be connected by rotating the control shaft 5 to position the test motor 2. When installing the connector 9, it can be inserted above the output shaft 3. Figure 5 As shown, the adjusting sleeve 15 is then rotated to move it downwards, and the extrusion groove 16 extrudes the positioning block 13, connecting the positioning block 13 and the output shaft 3. At the same time, the center of the output shaft 3 is aligned with the center of the connector 9, and the output shaft 3 can stably drive the connector 9 to rotate. Subsequently, the detection range of the device can be adjusted by replacing the test head 10. The smaller the width of the upper surface of the test head 10, the higher the detection accuracy.

[0037] Example 3: Based on Example 1, as follows Figure 7-10As shown, the centering mechanism further discloses a centering block 17, a control block 18, a second spring 19, a through groove 20, and a control mechanism. The centering block 17 is evenly distributed inside the movable seat 8. The control block 18 is located outside the centering block 17, forming a horizontal sliding structure between the control block 18 and the movable seat 8. The second spring 19 is located outside the control block 18 to provide thrust to the control block 18. The through groove 20 is located in the middle of the control block 18. The control mechanism is connected to the through groove 20 to control the movement of the control block 18. The control mechanism includes a pressing block 21, a linkage ring 22, and a telescopic device 23. The pressing block 21 is located inside the through groove 20, and forms an up-and-down sliding structure between the pressing block 21 and the movable seat 8. The surface of the pressing block 21 is designed with an inclined structure. The linkage ring 22 is fixed above the pressing block 21 to synchronously control the movement of multiple sets of pressing blocks 21. The telescopic device 23... 3. Installed above the movable seat 8, and the telescopic device 23 is connected to the linkage ring 22 to control the movement of the linkage ring 22. The centering block 17 and the control block 18 form a horizontal sliding structure, and a third spring 24 is provided between the centering block 17 and the control block 18 to provide a movement buffer distance for the centering block 17. A motor stabilizing mechanism is provided below the extrusion block 21 to position the test motor 2 behind the centering output shaft 3. The motor stabilizing mechanism includes a lower pressure foot 25, a movable plate 26 and a fourth spring 27. The lower pressure foot 25 is fixed below the extrusion block 21. The movable plate 26 is set below the control block 18, and a horizontal sliding structure is formed between the movable plate 26 and the movable seat 8. The support frame 6 has a slot corresponding to the movable plate 26, and the inner end of the movable plate 26 is designed with an inclined structure. The fourth spring 27 is set on the outer side of the movable plate 26 to provide an inward thrust for the movable plate 26.

[0038] After the movable seat 8 is moved downwards, the linkage ring 22 can be moved downwards via the telescopic device 23, such as... Figure 9 As shown, the linkage ring 22 drives the pressing block 21 to move downward. The pressing block 21 moves downward and pushes the control block 18 to move through the through slot 20, causing the centering block 17 to move and center the output shaft 3. After the output shaft 3 is centered, the pressing block 21 can continue to move downward. The pressing block 21 moves downward and presses the movable plate 26, causing the movable plate 26 and the support frame 6 to engage and limit the movable seat 8. At the same time, the pressing block 21 releases its pressure on the through slot 20, the centering block 17 is disconnected from the output shaft 3, and the lower pressing foot 25 moves downward and connects to the test motor 2 to position the test motor 2 and keep it stable during subsequent testing.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0040] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the coaxiality of a motor shaft, comprising a base (1), a test motor (2) placed on the base (1), and an output shaft (3) connected to the test motor (2); Its features are: A support frame (6) is provided above the base (1), and a connecting plate (7) is installed above the support frame (6). A movable seat (8) is nested on the outside of the support frame (6). The middle part of the movable seat (8) is designed with an open structure. The output shaft (3) passes through the middle part of the movable seat (8). A centering mechanism is provided in the middle part of the movable seat (8) to center and position the output shaft (3). A connector (9) is detachably connected above the output shaft (3). A test head (10) is provided above the connector (9). The side surface of the test head (10) is designed with an inclined structure. The upper end of the test head (10) is designed with a ring shape. A laser measuring instrument (11) installed below the connecting plate (7) is provided above the ring surface of the test head (10). The vertical center line of the connector (9) and the vertical center line of the output shaft (3) are set to coincide with each other.

2. The device for detecting the coaxiality of a motor shaft according to claim 1, characterized in that: The test head (10) is fixed with an installation head (12) below it. The installation head (12) and the connector (9) form a threaded connection, and a connection positioning mechanism is provided below the connector (9).

3. The device for detecting the coaxiality of a motor shaft according to claim 2, characterized in that: The connection and positioning mechanism includes a positioning block (13), a first spring (14), an adjusting sleeve (15), and a pressing groove (16). The positioning blocks (13) are evenly distributed in the lower part of the connector (9). The positioning blocks (13) and the connector (9) form a telescopic structure, and a groove for docking with the output shaft (3) is provided below the connector (9). The first spring (14) is located on the outside of the positioning block (13) to provide thrust to the positioning block (13); Adjusting sleeve (15) is fitted on the outside of connector (9), and a threaded connection is formed between adjusting sleeve (15) and connector (9); The extrusion groove (16) is located below the adjustment sleeve (15), and the inner wall of the extrusion groove (16) is designed with an inclined structure.

4. The device for detecting the coaxiality of a motor shaft according to claim 1, characterized in that: An auxiliary positioning mechanism is provided above the base (1) to position the test motor (2).

5. The device for detecting the coaxiality of a motor shaft according to claim 4, characterized in that: The auxiliary positioning mechanism includes a clamping plate (4) and a control shaft (5); The clamping plate (4) is set on the left and right sides of the test motor (2), and the clamping plate (4) and the base (1) form a horizontal sliding structure; The control shaft (5) is rotatably mounted on the outer surface of the clamp (4), and a threaded connection is formed between the control shaft (5) and the base (1).

6. The device for detecting the coaxiality of a motor shaft according to claim 1, characterized in that: The centering mechanism includes a centering block (17), a control block (18), a second spring (19), a through slot (20), and a control mechanism; The central block (17) is distributed at equal angles inside the movable seat (8); The control block (18) is located outside the center block (17), and a horizontal sliding structure is formed between the control block (18) and the movable seat (8); The second spring (19) is located on the outside of the control block (18) to provide thrust to the control block (18); A through slot (20) is provided in the middle of the control block (18); The control mechanism is connected to the through slot (20) to control the movement of the control block (18).

7. The device for detecting the coaxiality of a motor shaft according to claim 6, characterized in that: The control mechanism includes a compression block (21), a linkage ring (22), and a telescopic device (23). The extrusion block (21) is set inside the through groove (20), and the extrusion block (21) and the movable seat (8) form an up-and-down sliding structure, and the surface of the extrusion block (21) is designed with an inclined structure. The linkage ring (22) is fixed above the extrusion block (21) to synchronously control the movement of multiple extrusion blocks (21); The telescopic device (23) is installed above the movable seat (8), and the telescopic device (23) is connected to the linkage ring (22) to control the movement of the linkage ring (22).

8. The device for detecting the coaxiality of a motor shaft according to claim 7, characterized in that: The centering block (17) and the control block (18) form a horizontal sliding structure, and a third spring (24) is provided between the centering block (17) and the control block (18) to provide a movement buffer distance for the centering block (17).

9. A device for detecting the coaxiality of a motor shaft according to claim 7, characterized in that: A motor stabilizing mechanism is provided below the extrusion block (21) to position the test motor (2) behind the centered output shaft (3).

10. A device for detecting the coaxiality of a motor shaft according to claim 9, characterized in that: The motor stabilizing mechanism includes a lower pressure foot (25), a movable plate (26), and a fourth spring (27); The lower presser foot (25) is fixed below the extrusion block (21); The movable plate (26) is located below the control block (18), and the movable plate (26) and the movable seat (8) form a horizontal sliding structure. The support frame (6) has a slot corresponding to the movable plate (26), and the inner end of the movable plate (26) is designed with an inclined structure. The fourth spring (27) is located on the outside of the movable plate (26) to provide an inward thrust to the movable plate (26).

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