A stator liner tool and method of use thereof

Abstract

The application discloses a stator lining tool and a use method thereof, and belongs to the technical field of motor production and manufacturing. The stator lining tool comprises a support rod flange plate and an expansion sleeve. The support rod flange plate comprises a flange part and a support rod part. The expansion sleeve is sleeved on one end of the support rod part away from the flange part. The support rod flange plate is hollow. A pull rod penetrates through the support rod flange plate in the axial direction. One end of the pull rod is provided with a tension disc which is connected with the expansion sleeve away from the flange part. The use method comprises the following steps: S1: the expansion sleeve is sleeved on the support rod part of the support rod flange plate, and then the pull rod is tightened so that the tension disc is completely embedded in the accommodating groove of the expansion sleeve; S2: the adjusting piece is loaded into the limiting groove, the machine tool is started to pull the pull rod, the expansion sleeve is in a tension expansion state, and then the machine tool is used to remove the excess size on the surface of the adjusting piece along the circumference of the expansion sleeve; and S3: the detection tool is installed on the adjusted adjusting piece, the machine tool is started to pull the pull rod, the pressure between the adjusting piece and the pressure measuring groove is detected, and the pressure error is not stopped until the pressure error meets the expected value.

Description

Technical Field

[0001] This invention relates to a stator inner diameter detection fixture, and more specifically, to a stator inner liner fixture and its method of use. Background Technology

[0002] The stator is the core component of an electric motor. During the production and assembly process, whether the stator's dimensional parameters meet the standards determines the motor's performance. Therefore, it is necessary to strictly measure and verify the dimensional accuracy (including the inner diameter of the stator core, coaxiality, and other parameters) and mechanical properties of the stator products to ensure that the windings can be arranged reasonably within the stator core, so as to ensure that the stator can meet the production requirements and guarantee the motor's performance requirements.

[0003] For example, Chinese Patent Publication No. CN115940534A, published on April 7, 2023, entitled "A Stator Core Manufacturing Fixture and Method," discloses a stator core manufacturing technology, including a stacking device. The stacking device comprises a base plate, a top plate, and a stacking body located between the base plate and the top plate. The stacking device has a bottom limiting structure at the bottom of the stacking body for radially limiting the bottom of the stacking body to the bottom of the base plate, and a top limiting structure at the top of the stacking body for radially limiting the top of the stacking body to the top of the top plate. This solution can avoid radial deformation of the stator core during the manufacturing process of large motors, such as during hoisting, turning, and inter-process transfer, thus ensuring the manufacturing quality of the motor and improving the pass rate of large motor manufacturing. However, this solution does not provide means or methods to ensure that the stator meets the requirements after production, and therefore cannot guarantee the pass rate of the stator products. Summary of the Invention

[0004] This invention overcomes the lack of testing technology for stator products in the prior art, and provides a stator liner tooling and its usage method. This solution can test the dimensional accuracy and mechanical properties of the stator core, ensuring that the stator products meet production requirements and improving product quality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a stator liner fixture, including a support flange and an expansion sleeve. The support flange includes a flange portion and a support rod portion. The expansion sleeve is fitted onto the end of the support rod portion away from the flange portion. The support flange is hollow inside. A tie rod passes through the support flange axially. One end of the tie rod is provided with a tension plate that mates with the end of the expansion sleeve away from the flange portion. In this solution, the support flange is the mounting component for the expansion sleeve. The flange portion is used to mount the support flange on the machine tool. The support flange is hollow to facilitate the passage of the tie rod. A tension force is applied to the end of the expansion sleeve by the tie rod, allowing the expansion sleeve to be tightened and expanded. Finally, by detecting the tightening force around the expansion sleeve (detected by applying a detection fixture), the dimensional accuracy and mechanical properties of the stator core can be tested, ensuring that the tested stator cores meet production requirements and improving product quality.

[0006] Preferably, one end of the expansion sleeve is provided with a receiving groove, and the tension plate is embedded in the receiving groove. The other end of the expansion sleeve, located inside the expansion sleeve, is provided with a bevel that mates with the support rod portion. The receiving groove at one end of the expansion sleeve can mate with the tension plate of the tension rod, and the tension plate only applies axial force to the expansion sleeve. The bevel at the other end of the expansion sleeve can mate with the corresponding bevel on the support rod portion, so that the expansion sleeve can expand radially under the tightening action of the tension rod.

[0007] Preferably, the support rod is fitted with an elastic component, which is located between the flange and the expansion sleeve. The elastic component includes a sleeve and an elastic element fitted outside the sleeve. A limiting portion is provided at one end of the sleeve near the expansion sleeve, and the length of the sleeve is less than the distance between the flange and the expansion sleeve. The elastic component can reset the tightened expansion sleeve, making reset easier. It also provides a certain reverse elastic force to the expansion sleeve, making the force between the expansion sleeve and the sleeve more stable, thus ensuring uniform force on the end face of the expansion sleeve, resulting in a more uniform expansion effect.

[0008] Preferably, the expansion sleeve has a plurality of first tension grooves and second tension grooves evenly distributed circumferentially and arranged axially. The first tension grooves and second tension grooves are alternately distributed and have opposite openings. The first tension grooves and second tension grooves enable the expansion sleeve to expand, and the opposite openings of the first tension grooves and second tension grooves ensure that the expansion of the expansion sleeve is uniform.

[0009] Preferably, the opening of the first tension groove faces the flange portion, and a positioning pin is provided on the support rod portion, which is located in the first tension groove. The positioning pin on the support rod portion cooperates with the first tension groove in the expansion sleeve to restrict the circumferential movement of the expansion sleeve during the tightening process and to ensure axial movement.

[0010] Preferably, a limiting groove is provided between the first tension groove and the second tension groove, and an adjusting piece is provided within the limiting groove. The adjusting piece circumferentially blocks the first tension groove and the second tension groove on both sides. The adjusting piece can adjust the circumferential dimension of the expansion sleeve, so that this solution can be applied to the testing of stator cores of various types and sizes. The size of the adjusting piece extends to the areas where the first tension groove and the second tension groove are located on both sides, so that when the expansion sleeve expands, force can be applied to the adjusting piece, and all adjusting pieces can expand evenly to ensure the testing effect.

[0011] Preferably, the system also includes a testing fixture, which is fitted over the expansion sleeve. The testing fixture has a pressure testing groove on its inner side that matches the adjusting plate, and a pressure sensor is positioned between the adjusting plate and the pressure testing groove. The testing fixture is a standard component used to calibrate the testing standards of the stator liner fixture. Pressure is measured between the testing fixture and the adjusting plate using a pressure sensor, which can be used to test the dimensional accuracy and mechanical properties of the stator core subsequently.

[0012] Preferably, the end of the pull rod away from the tension plate is a threaded rod. The thread on the pull rod facilitates the installation of the tension plate in the receiving groove of the expansion sleeve, and also facilitates the application of tension force onto the expansion sleeve by the pull rod.

[0013] A method for using a stator liner fixture, comprising the following steps: S1: placing the expansion sleeve on the support rod portion of the support rod flange, and then tightening the pull rod to fully embed the tension plate into the receiving groove of the expansion sleeve; S2: inserting the adjusting plate into the limiting groove, starting the machine tool to pull the pull rod to put the expansion sleeve in a taut and expanded state, and then machining off the excess dimensions of the adjusting plate surface along the annular shape of the expansion sleeve; S3: installing the testing fixture on the machined adjusting plate, starting the machine tool to pull the pull rod, and testing the pressure between the adjusting plate and the pressure measuring groove until the pressure error meets the expected value.

[0014] Preferably, the adjusting piece and the expansion sleeve are interference fit.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) It can be used to test the dimensional accuracy and mechanical properties of stator cores, ensuring that stator products meet production requirements and improving product quality; (2) The method of use is simple. After the stator inner lining tooling is calibrated, it can be used for stator testing; (3) It can be applied to the testing of stators of various sizes; (4) The expansion effect of the expansion sleeve is uniform, which can improve the accuracy of testing. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is a schematic diagram showing the assembly state of the strut flange and the expansion sleeve of the present invention.

[0018] Figure 3 This is a schematic diagram of the strut flange of the present invention.

[0019] Figure 4 This is a schematic diagram of the elastic component of the present invention.

[0020] Figure 5 This is a schematic diagram of the expansion sleeve of the present invention.

[0021] Figure 6 This is a schematic diagram of the adjustment piece of the present invention.

[0022] Figure 7 This is a schematic diagram of the pull rod of the present invention.

[0023] Figure 8 This is a cross-sectional view of the strut flange and expansion sleeve assembly of the present invention.

[0024] Figure 9 This is a schematic diagram of the testing fixture of the present invention.

[0025] In the diagram: 1. Support flange, 2. Expansion sleeve, 3. Flange, 4. Support rod, 5. Tie rod, 6. Tension plate, 7. Receiving groove, 8.1. First bevel, 8.2. Second bevel, 9. Elastic component, 10. Sleeve, 11. First elastic element, 12. Limiting part, 13. First tension groove, 14. Second tension groove, 15. Positioning pin, 16. Limiting groove, 17. Adjusting piece, 18. Detection fixture, 19. Pressure measuring groove, 20. Threaded hole, 21. First pressure sensor, 22. Hexagonal hole, 23. Connecting part, 24. Limiting block, 25. Indicator light, 26. Second elastic element, 27. Power cable groove. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0027] Example 1: As Figures 1 to 9The stator inner liner fixture shown includes a support flange 1 and an expansion sleeve 2. The support flange 1 includes a support rod portion 4 and a flange portion 3, and is an integral cylindrical structure. The interior of the support flange 1 is a hollow cylindrical body. The radial dimension of the support rod portion 4 is smaller than the radial dimension of the flange portion 3, and the axial length of the support rod portion 4 is greater than the axial length of the flange portion 3. Two layers of annular first bevels 8.1 are provided at the end of the support rod portion 4 away from the flange portion 3. The two layers of first bevels 8.1 are located at the end of the support rod portion 4 and the main body of the support rod portion 4 near the end, respectively. The expansion sleeve 2 can mate with the end of the support rod portion 4 away from the flange portion 3. Two layers of second bevels 8.2 are also provided inside the expansion sleeve 2. The spacing between the second bevels 8.2 is the same as the spacing between the first bevels 8.1, and the first bevels 8.1 and... The second oblique opening 8.2 can cooperate with each other. When the expansion sleeve 2 is fitted on the support rod part 4, the first oblique opening 8.1 and the second oblique opening 8.2 can limit the expansion sleeve 2 to a certain extent. However, when there is axial compressive force between the expansion sleeve 2 and the support rod part 4, the first oblique opening 8.1 and the second oblique opening 8.2 can guide the axial movement of the expansion sleeve 2, so that the expansion sleeve 2 can be tightened and expanded. A tie rod 5 is also provided inside the support rod flange 1. The tie rod 5 axially passes through the entire support rod flange 1. A tension plate 6 is provided at one end of the tie rod 5, and a receiving groove 7 is provided at the end of the expansion sleeve 2 away from the flange part 3. Both the tension plate 6 and the receiving groove 7 are cylindrical. The size of the tension plate 6 is matched with the size of the receiving groove 7, so that the tension plate 6 can be embedded in the receiving groove 7. After the tie rod 5, the strut flange 1 and the expansion sleeve 2 are assembled, applying a pulling force from the end of the tie rod 5 away from the tension plate 6 will cause the expansion sleeve 2 to press tightly against the strut part 4 of the strut flange 1. Under the action of the first inclined opening 8.1 and the second inclined opening 8.2, the expansion sleeve 2 will move to a certain extent along the axial direction of the strut part 4, and finally cause the expansion sleeve 2 to expand.

[0028] The flange portion 3 of the strut flange 1 is provided with several bolt holes 20. The flange portion 3 allows the strut flange 1 to be mounted on a machine tool. The strut flange 1 can be fixed to the machine tool through the bolt holes 20 and bolts. To ensure accuracy, the bolts need to be adjusted to guarantee the concentricity and perpendicularity between the strut flange 1 and the machine tool. Specifically, a first pressure sensor 21 can be installed at the end of the flange portion 3. The first pressure sensors 21 are evenly arranged in a ring on the end face of the flange portion 3. Adjusting the bolts allows for adjustment of the detection pressure values ​​of each first sensor 21, ensuring that the pressure detected by each sensor 21 is as similar as possible, with an error within 5%.

[0029] The end of the pull rod 5 furthest from the tension plate 6 is a threaded rod, which allows the pull rod 5 to be threaded onto the machine tool, and the machine tool to apply tension to the pull rod 5. A hexagonal hole 22 is provided on the tension plate 6, allowing the pull rod 2 to be tightened using a hex wrench, and simultaneously allowing the tension plate 6 to be gradually inserted into the receiving groove 7 of the expansion sleeve 2. The depth of the receiving groove 7 on the expansion sleeve 2 is the same as the thickness of the tension plate 6. When the tension plate 6 is fully embedded in the receiving groove 7, the outer end face of the tension plate 6 is flush with the opening of the receiving groove 7. A second elastic element 26, a circular spring structure, is also fitted onto the threaded section of the pull rod 5. When the pull rod 5 is fixed on the machine tool, the second elastic element 26 ensures that the pull rod 5 has a certain preload, preventing it from loosening when the pull rod 5 rotates in both directions. The tension plate 6 is also provided with circumferentially evenly distributed power wire grooves 27. The power wire grooves 27 allow the stator winding to pass through, which first provides good constraint on the stator and prevents the winding from being thrown onto the machine tool during the rotation of the stator.

[0030] It should be noted that the first bevel 8.1 and the second bevel 8.2 have the same angle, and the second bevel 8.2 inside the expansion sleeve 2 and the inner diameter of the expansion sleeve 2 need to be machined in one go to ensure the consistency of the bevel angles of the two second bevels 8.2 inside the expansion sleeve 2, and further ensure the concentricity inside the expansion sleeve 2; similarly, the two first bevels 8.1 on the support rod part 4 and the support rod part 4 (the part that mates with the expansion sleeve 2) also need to be machined in one go to ensure the consistency of the bevel angles of the two first bevels 8.1 on the support rod part 4, and further ensure the concentricity of the surface of the support rod part 4.

[0031] The expansion sleeve 2 is also provided with a plurality of first tension grooves 13 and second tension grooves 14 in its circumferential direction. There are eight first tension grooves 13 and eight second tension grooves 14. The first tension grooves 13 and the second tension grooves 14 are alternately distributed on the axial surface of the expansion sleeve 2, and the first tension grooves 13 and the second tension grooves 14 penetrate the wall thickness of the expansion sleeve 2 but do not penetrate its axial direction. The openings of the first tension grooves 13 and the second tension grooves 14 are arranged in opposite directions, thereby ensuring that the expansion sleeve 2 expands evenly radially when it is tightened and expanded by the support rod part 4, ensuring the expansion effect. A circular hole is provided at the end of the first tension groove 13 and the second tension groove 14 away from the end face of the expansion sleeve 2. The circular hole can eliminate the stress of the tension grooves on the wall of the expansion sleeve 2, ensuring that the first tension grooves 13 and the second tension groove 14 are not easily damaged when expanded. The opening of the first tension groove 13 faces the location of the flange part 3, while the opening of the second tension groove 14 faces away from the location of the flange part 3.

[0032] A positioning pin 15 is also provided on the support rod part 4. The size of the positioning pin 15 is adapted to the groove width of the first tension groove 13. Specifically, the positioning pin 15 is a cylindrical block that protrudes from the support rod part 4 and mates with the expansion sleeve 2. The outer diameter of the positioning pin 15 is about 0.1 mm smaller than the groove width of the first tension groove 13. This ensures that the positioning pin 15 can smoothly enter the first tension groove 13. In addition, the positioning pin 15 can also prevent the expansion sleeve 2 from rotating circumferentially along the support rod part 4 without hindering the axial movement between the expansion sleeve 2 and the support rod part 4.

[0033] A limiting groove 16 is also provided on the outer surface of the expansion sleeve 2. The length direction of the limiting groove 16 is along the axial direction of the expansion sleeve 2. The limiting groove 16 is arranged between the first tension groove 13 and the second tension groove 14. The cross-section of the limiting groove 16 is T-shaped. The limiting groove 16 does not penetrate the wall thickness of the expansion sleeve 2. One end of the limiting groove 16 extends to the end face of the expansion sleeve 2, and the other end is located on the surface of the expansion sleeve 2. The opening direction of the limiting groove 16 is the same as the opening direction of the second tension groove 14, facing the end of the expansion sleeve 2 away from the flange 3. Eight adjusting pieces 17 are provided within the limiting grooves 16, respectively arranged on the eight limiting grooves 16 of the expansion sleeve 2. Specifically, each adjusting piece 17 includes a connecting part 23, which is a slider with a T-shaped cross-section adapted to the limiting groove 16. The adjusting piece 17 is an arc-shaped piece adapted to the surface of the expansion sleeve 2. The slider is arranged on the concave side of the adjusting piece 17, so that when all the adjusting pieces 17 are assembled, they can form a cylindrical shape, that is, the radial dimension of the expansion sleeve 2 can be changed by adjusting the adjusting pieces 17. A limiting block 24 is also provided on the adjusting piece 17. The limiting block 24 is a limiting boss protruding on the convex side of the adjusting piece 17 and is arranged on the side of the adjusting piece 17 near the flange part 3. The limiting grooves 16 and the adjusting pieces 17 are interference fit, and the two fit dimensions are required to be tightly fitted with an interference of 0.01-0.02mm. It should be noted that after the adjusting plate 17 is installed, the two circumferential sides of the adjusting plate 17 can respectively block the first tension groove 13 and the second tension groove 14. That is, when the radial dimension of the expansion sleeve 2 expands, the main body of the expansion sleeve 2 on both sides of the first tension groove 13 and the second tension groove 14 can be pressed against the concave surface of the adjusting plate 17, thereby transferring the force to the adjusting plate 17, so that the radial movement of the adjusting plate 17 can also be synchronized, ensuring that the radial expansion effect is uniform.

[0034] This solution also requires a testing fixture 18, which is a standard part with the same shape as the stator core. A pressure measuring groove 19 (stator core winding groove) is provided inside the testing fixture 18. When the testing fixture 18 is fitted onto the outside of the expansion sleeve 2, the adjusting piece 17 on the outer surface of the expansion sleeve 2 needs to be located within the pressure measuring groove 19 inside the testing fixture 18, and the testing fixture 18 abuts against the limiting block 24 on the adjusting piece 17, which limits the movement of the testing fixture 18. A second pressure sensor is provided between the adjusting piece 17 and the pressure measuring groove 19, and eight sets of the second pressure sensors are also provided; the second pressure sensor can detect the pressure value between the adjusting piece 17 and the pressure measuring groove 19.

[0035] An indicator light 25 is also provided on the end face of the detection fixture 18. When the pressure values ​​detected by all the second sensors are within the design requirements, the indicator light 25 will light up green. When the pressure at a certain position is too high or too low, a red alarm will be displayed. Therefore, it is only necessary to adjust the corresponding adjustment piece 17 or make a fine adjustment at the corresponding position.

[0036] A method for using a stator liner tooling, which employs the aforementioned stator liner tooling, includes the following steps.

[0037] First, the flange 3 of the strut flange 1 is fixed to the machine tool with bolts. Then, the concentricity and perpendicularity between the strut flange 1 and the machine tool are adjusted by adjusting the tightness of the bolts. The error value detected by the first pressure sensor 21 is within 5%.

[0038] Then, the expansion sleeve 2 is fitted onto one end of the support rod portion 4 of the support rod flange 1, so that the second bevel 8.2 on the expansion sleeve 2 is initially engaged with the first bevel 8.1 on the support rod portion 4, and at the same time, the positioning pin 15 is located in the first tension groove 13; then the threaded end of the pull rod 5 passes through the support rod flange 1 from the side where the expansion sleeve 2 is located, and the threaded end is threaded onto the machine tool, and the tension plate 6 is completely screwed into the receiving groove 7 of the expansion sleeve 2, so that the tension plate 6 is initially pressed against the receiving groove 7.

[0039] Next, the connecting part 23 of the adjusting piece 17 is installed in the limiting groove 16 of the expansion sleeve 2, and the connecting part 23 and the limiting groove 16 are designed to be interference fit; the two fitting dimensions are required to be 0.01-0.02mm interference fit. Start the machine tool, pull the pull rod 5, the pull rod 5 moves along the axial direction of the support flange 1, the tension plate 6 applies force from the end face of the expansion sleeve 2, so that the expansion sleeve 2 is pressed against the support part 4, and under the action of the first inclined plate 8.1 and the second inclined plate 8.2, the expansion sleeve 2 is stretched and expanded. Then, the adjusting piece 17 in the expanded state is machined to remove the excess outer diameter of the adjusting piece 17 and form a limiting part on the adjusting piece 17 to fit and limit the detection fixture 18. This not only ensures the concentricity of the adjusting piece 17 as a whole with the spindle of the machine tool, but also ensures effective expansion and prevents the stator (detection fixture 18) from deforming.

[0040] Finally, the testing fixture 18 is fitted onto the outer surface of the arranged adjusting piece 17, so that the adjusting piece 17 is located in the pressure measuring groove 19 inside the testing fixture 18. The machine tool is started and the pull rod 5 is pulled, so that the adjusting piece 17 is tightened inside the testing fixture 18. By detecting and calculating the error in the second pressure sensor, it is determined whether the circumferential uniformity of the stator liner fixture meets the requirements. When the indicator light 25 on the testing fixture 18 is green, it indicates that the pressure value detected by the second sensor is within the design requirement range. If it is red, the above adjustment steps continue until the stator liner fixture is qualified.

[0041] Example 2: As Figures 1 to 9 The stator liner fixture shown includes a support flange 1, an expansion sleeve 2, and an elastic component 9. The support flange 1 includes a support rod portion 4 and a flange portion 3, and is an integral cylindrical structure. The interior of the support flange 1 is a cylindrical hollow body. The radial dimension of the support rod portion 4 is smaller than the radial dimension of the flange portion 3, and the axial length of the support rod portion 4 is greater than the axial length of the flange portion 3. Two layers of annular first bevels 8.1 are provided at the end of the support rod portion 4 away from the flange portion 3. The two layers of first bevels 8.1 are located at the end of the support rod portion 4 and the main body of the support rod portion 4 near the end, respectively. The expansion sleeve 2 can be used with the support rod portion 4 away from the flange portion 3. One end of the sleeve 2 is fitted with a second inclined opening 8.2, which is also provided inside the sleeve 2. The spacing between the second inclined openings 8.2 is the same as the spacing between the first inclined openings 8.1, and the first inclined openings 8.1 and the second inclined openings 8.2 can cooperate with each other. When the sleeve 2 is fitted onto the support rod part 4, the first inclined openings 8.1 and the second inclined openings 8.2 can limit the sleeve 2 to a certain extent. However, when there is axial compressive force between the sleeve 2 and the support rod part 4, the first inclined openings 8.1 and the second inclined openings 8.2 can guide the axial movement of the sleeve 2, so that the sleeve 2 can be stretched and expanded. The elastic component 9 is fitted onto the outer surface of the support rod part 4, which provides elastic reset for the sleeve 2 and makes the axial force on the sleeve 2 more uniform.

[0042] A tie rod 5 is also provided inside the strut flange 1, axially penetrating the entire strut flange 1. A tension plate 6 is provided at one end of the tie rod 5, and a receiving groove 7 is provided at the end of the expansion sleeve 2 away from the flange portion 3. Both the tension plate 6 and the receiving groove 7 are cylindrical, and the size of the tension plate 6 is adapted to the size of the receiving groove 7, so that the tension plate 6 can be embedded in the receiving groove 7. After the tie rod 5, strut flange 1 and expansion sleeve 2 are assembled, applying a tension force from the end of the tie rod 5 away from the tension plate 6 will cause the expansion sleeve 2 to press tightly against the strut portion 4 of the strut flange 1. Under the action of the first inclined opening 8.1 and the second inclined opening 8.2, the expansion sleeve 2 will move to a certain extent along the axial direction of the strut portion 4, eventually causing the expansion sleeve 2 to expand.

[0043] The flange portion 3 of the strut flange 1 is provided with several bolt holes 20. The flange portion 3 allows the strut flange 1 to be mounted on a machine tool. The strut flange 1 can be fixed to the machine tool through the bolt holes 20 and bolts. To ensure accuracy, the bolts need to be adjusted to guarantee the concentricity and perpendicularity between the strut flange 1 and the machine tool. Specifically, a first pressure sensor 21 can be installed at the end of the flange portion 3. The first pressure sensors 21 are evenly arranged in a ring on the end face of the flange portion 3. Adjusting the bolts allows for adjustment of the detection pressure values ​​of each first sensor 21, ensuring that the pressure detected by each sensor 21 is as similar as possible, with an error within 5%.

[0044] The elastic component 9 includes a sleeve 10 and a first elastic element 11. The sleeve 10 is T-shaped, with a limiting part 12 at the T-shaped end, positioned near the expansion sleeve 2. The limiting part 12 limits the position of the expansion sleeve 2 and applies force to its end face. The limiting part 12, in conjunction with the tension plate 6, ensures uniform axial force on the expansion sleeve 2, improving its expansion effect. The first elastic element 11 is a round spring, fitted onto the outer surface of the sleeve 10, providing elastic reset for the expansion sleeve 2. It should be noted that the length of the sleeve 10 must be less than the distance from the rear end of the expansion sleeve 2 to the flange 3 of the support flange 1; otherwise, the expansion sleeve 2 cannot expand effectively and will not function as an internal clamp. Furthermore, the length of the spring element 11 must be greater than the length of the straight section of the T-shaped sleeve 10.

[0045] The end of the pull rod 5 furthest from the tension plate 6 is a threaded rod, which allows the pull rod 5 to be threaded onto the machine tool, and the machine tool to apply tension to the pull rod 5. A hexagonal hole 22 is provided on the tension plate 6, allowing the pull rod 2 to be tightened using a hex wrench, and simultaneously allowing the tension plate 6 to be gradually inserted into the receiving groove 7 of the expansion sleeve 2. The depth of the receiving groove 7 on the expansion sleeve 2 is the same as the thickness of the tension plate 6. When the tension plate 6 is fully embedded in the receiving groove 7, the outer end face of the tension plate 6 is flush with the opening of the receiving groove 7. A second elastic element 26, a circular spring structure, is also fitted onto the threaded section of the pull rod 5. When the pull rod 5 is fixed on the machine tool, the second elastic element 26 ensures that the pull rod 5 has a certain preload, preventing it from loosening when the pull rod 5 rotates in both directions. The tension plate 6 is also provided with circumferentially evenly distributed power wire grooves 27. The power wire grooves 27 allow the stator winding to pass through, which first provides good constraint on the stator and prevents the winding from being thrown onto the machine tool during the rotation of the stator.

[0046] It should be noted that the first bevel 8.1 and the second bevel 8.2 have the same angle, and the second bevel 8.2 inside the expansion sleeve 2 and the inner diameter of the expansion sleeve 2 need to be machined in one go to ensure the consistency of the bevel angles of the two second bevels 8.2 inside the expansion sleeve 2, and further ensure the concentricity inside the expansion sleeve 2; similarly, the two first bevels 8.1 on the support rod part 4 and the support rod part 4 (the part that mates with the expansion sleeve 2) also need to be machined in one go to ensure the consistency of the bevel angles of the two first bevels 8.1 on the support rod part 4, and further ensure the concentricity of the surface of the support rod part 4.

[0047] The expansion sleeve 2 is also provided with a plurality of first tension grooves 13 and second tension grooves 14 in its circumferential direction. There are eight first tension grooves 13 and eight second tension grooves 14. The first tension grooves 13 and the second tension grooves 14 are alternately distributed on the axial surface of the expansion sleeve 2, and the first tension grooves 13 and the second tension grooves 14 penetrate the wall thickness of the expansion sleeve 2 but do not penetrate its axial direction. The openings of the first tension grooves 13 and the second tension grooves 14 are arranged in opposite directions, thereby ensuring that the expansion sleeve 2 expands evenly radially when it is tightened and expanded by the support rod part 4, ensuring the expansion effect. A circular hole is provided at the end of the first tension groove 13 and the second tension groove 14 away from the end face of the expansion sleeve 2. The circular hole can eliminate the stress of the tension grooves on the wall of the expansion sleeve 2, ensuring that the first tension grooves 13 and the second tension groove 14 are not easily damaged when expanded. The opening of the first tension groove 13 faces the location of the flange part 3, while the opening of the second tension groove 14 faces away from the location of the flange part 3.

[0048] A positioning pin 15 is also provided on the support rod part 4. The size of the positioning pin 15 is adapted to the groove width of the first tension groove 13. Specifically, the positioning pin 15 is a cylindrical block that protrudes from the support rod part 4 and mates with the expansion sleeve 2. The outer diameter of the positioning pin 15 is about 0.1 mm smaller than the groove width of the first tension groove 13. This ensures that the positioning pin 15 can smoothly enter the first tension groove 13. In addition, the positioning pin 15 can also prevent the expansion sleeve 2 from rotating circumferentially along the support rod part 4 without hindering the axial movement between the expansion sleeve 2 and the support rod part 4.

[0049] A limiting groove 16 is also provided on the outer surface of the expansion sleeve 2. The length direction of the limiting groove 16 is along the axial direction of the expansion sleeve 2. The limiting groove 16 is arranged between the first tension groove 13 and the second tension groove 14. The cross-section of the limiting groove 16 is T-shaped. The limiting groove 16 does not penetrate the wall thickness of the expansion sleeve 2. One end of the limiting groove 16 extends to the end face of the expansion sleeve 2, and the other end is located on the surface of the expansion sleeve 2. The opening direction of the limiting groove 16 is the same as the opening direction of the second tension groove 14, facing the end of the expansion sleeve 2 away from the flange 3. Eight adjusting pieces 17 are provided within the limiting grooves 16, respectively arranged on the eight limiting grooves 16 of the expansion sleeve 2. Specifically, each adjusting piece 17 includes a connecting part 23, which is a slider with a T-shaped cross-section adapted to the limiting groove 16. The adjusting piece 17 is an arc-shaped piece adapted to the surface of the expansion sleeve 2. The slider is arranged on the concave side of the adjusting piece 17, so that when all the adjusting pieces 17 are assembled, they can form a cylindrical shape, that is, the radial dimension of the expansion sleeve 2 can be changed by adjusting the adjusting pieces 17. A limiting block 24 is also provided on the adjusting piece 17. The limiting block 24 is a limiting boss protruding on the convex side of the adjusting piece 17 and is arranged on the side of the adjusting piece 17 near the flange part 3. The limiting grooves 16 and the adjusting pieces 17 are interference fit, and the two fit dimensions are required to be tightly fitted with an interference of 0.01-0.02mm. It should be noted that after the adjusting plate 17 is installed, the two circumferential sides of the adjusting plate 17 can respectively block the first tension groove 13 and the second tension groove 14. That is, when the radial dimension of the expansion sleeve 2 expands, the main body of the expansion sleeve 2 on both sides of the first tension groove 13 and the second tension groove 14 can be pressed against the concave surface of the adjusting plate 17, thereby transferring the force to the adjusting plate 17, so that the radial movement of the adjusting plate 17 can also be synchronized, ensuring that the radial expansion effect is uniform.

[0050] This solution also requires a testing fixture 18, which is a standard part with the same shape as the stator core. A pressure measuring groove 19 (stator core winding groove) is provided inside the testing fixture 18. When the testing fixture 18 is fitted onto the outside of the expansion sleeve 2, the adjusting piece 17 on the outer surface of the expansion sleeve 2 needs to be located within the pressure measuring groove 19 inside the testing fixture 18, and the testing fixture 18 abuts against the limiting block 24 on the adjusting piece 17, which limits the movement of the testing fixture 18. A second pressure sensor is provided between the adjusting piece 17 and the pressure measuring groove 19, and eight sets of the second pressure sensors are also provided; the second pressure sensor can detect the pressure value between the adjusting piece 17 and the pressure measuring groove 19.

[0051] An indicator light 25 is also provided on the end face of the detection fixture 18. When the pressure values ​​detected by all the second sensors are within the design requirements, the indicator light 25 will light up green. When the pressure at a certain position is too high or too low, a red alarm will be displayed. Therefore, it is only necessary to adjust the corresponding adjustment piece 17 or make a fine adjustment at the corresponding position.

[0052] A method for using a stator liner tooling, which employs the aforementioned stator liner tooling, includes the following steps.

[0053] First, the flange 3 of the strut flange 1 is fixed to the machine tool with bolts. Then, the concentricity and perpendicularity between the strut flange 1 and the machine tool are adjusted by adjusting the tightness of the bolts. The error value detected by the first pressure sensor 21 is within 5%.

[0054] Then, the expansion sleeve 2 is fitted onto one end of the support rod portion 4 of the support rod flange 1, so that the second bevel 8.2 on the expansion sleeve 2 is initially engaged with the first bevel 8.1 on the support rod portion 4, and at the same time, the positioning pin 15 is located in the first tension groove 13; then the threaded end of the pull rod 5 passes through the support rod flange 1 from the side where the expansion sleeve 2 is located, and the threaded end is threaded onto the machine tool, and the tension plate 6 is completely screwed into the receiving groove 7 of the expansion sleeve 2, so that the tension plate 6 is initially pressed against the receiving groove 7.

[0055] Next, the connecting part 23 of the adjusting piece 17 is installed in the limiting groove 16 of the expansion sleeve 2, and the connecting part 23 and the limiting groove 16 are designed to be interference fit; the two fitting dimensions are required to be 0.01-0.02mm interference fit. Start the machine tool, pull the pull rod 5, the pull rod 5 moves along the axial direction of the support flange 1, the tension plate 6 applies force from the end face of the expansion sleeve 2, so that the expansion sleeve 2 is pressed against the support part 4, and under the action of the first inclined plate 8.1 and the second inclined plate 8.2, the expansion sleeve 2 is stretched and expanded. Then, the adjusting piece 17 in the expanded state is machined to remove the excess outer diameter of the adjusting piece 17 and form a limiting part on the adjusting piece 17 to fit and limit the detection fixture 18. This not only ensures the concentricity of the adjusting piece 17 as a whole with the spindle of the machine tool, but also ensures effective expansion and prevents the stator (detection fixture 18) from deforming.

[0056] Finally, the testing fixture 18 is fitted onto the outer surface of the arranged adjusting piece 17, so that the adjusting piece 17 is located in the pressure measuring groove 19 inside the testing fixture 18. The machine tool is started and the pull rod 5 is pulled, so that the adjusting piece 17 is tightened inside the testing fixture 18. By detecting and calculating the error in the second pressure sensor, it is determined whether the circumferential uniformity of the stator liner fixture meets the requirements. When the indicator light 25 on the testing fixture 18 is green, it indicates that the pressure value detected by the second sensor is within the design requirement range. If it is red, the above adjustment steps continue until the stator liner fixture is qualified.

Claims

1. A stator liner tooling, characterized in that, The device includes a strut flange and an expansion sleeve. The strut flange includes a flange portion and a strut portion. The expansion sleeve is fitted onto the end of the strut portion away from the flange portion. The strut flange is hollow inside. A tie rod passes through the strut flange axially. One end of the tie rod is provided with a tension plate and is connected to the end of the expansion sleeve away from the flange portion. The expansion sleeve has several axially arranged first tension grooves and second tension grooves evenly distributed around its circumference. A limiting groove is provided between the first tension grooves and the second tension grooves. Adjusting pieces are provided in the limiting grooves on both sides around the circumference to block the first tension grooves and the second tension grooves. A pressure measuring groove is provided in the testing fixture and fitted onto the outside of the expansion sleeve. The adjusting pieces are located in the pressure measuring groove.

2. The stator liner tooling according to claim 1, characterized in that, One end of the expansion sleeve is provided with a receiving groove, and the tension plate is embedded in the receiving groove. The other end of the expansion sleeve, located inside the expansion sleeve, is provided with an oblique opening that cooperates with the support rod portion.

3. The stator liner tooling according to claim 1, characterized in that, The support rod is fitted with an elastic component, which is located between the flange and the expansion sleeve. The elastic component includes a sleeve and an elastic element fitted outside the sleeve. The sleeve has a limiting part near the expansion sleeve, and the length of the sleeve is less than the distance between the flange and the expansion sleeve.

4. A stator liner fixture according to any one of claims 1 to 3, characterized in that, The first tension groove and the second tension groove are alternately distributed and have opposite openings.

5. A stator liner fixture according to claim 4, characterized in that, The opening of the first tension groove faces the flange portion, and the support rod portion is provided with a positioning pin, which is located in the first tension groove.

6. A stator liner fixture according to claim 1, characterized in that, The inner side of the testing fixture is provided with a pressure measuring groove that is adapted to the adjustment plate, and a pressure sensor is provided between the adjustment plate and the pressure measuring groove.

7. A stator liner fixture according to claim 4, characterized in that, The end of the pull rod away from the tension plate is a threaded rod.

8. A method of using a stator liner fixture, characterized in that, The stator liner tooling described in any one of claims 1 to 7 is implemented by the following steps: S1: Place the expansion sleeve onto the support rod part of the support rod flange, and then tighten the tie rod so that the tension plate is fully embedded in the receiving groove of the expansion sleeve; S2: Insert the adjusting piece into the limiting groove, start the machine tool and pull the pull rod to make the expansion sleeve in a tightened and expanded state, and then machine off the excess size of the adjusting piece surface along the circumference of the expansion sleeve; S3: Install the testing fixture on the machined adjustment piece, start the machine tool and pull the lever to test the pressure between the adjustment piece and the pressure measuring groove until the pressure error meets the expected value.

9. The method of using a stator liner tooling according to claim 8, characterized in that, The adjusting piece and the expansion sleeve are interference fit.

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