A flywheel energy storage rotating shaft forging strength reliability detection device

Abstract

The application relates to the technical field of flywheel energy storage rotating shaft forging detection, and discloses a flywheel energy storage rotating shaft forging strength reliability detection device, which comprises a detection machine body, a supporting table arranged on the detection machine body and used for supporting a workpiece to be detected, a top support arranged on the top of the detection machine body, a lower pressing box arranged at the bottom of the top support and a lower pressing part arranged in the lower pressing box. Through the arrangement of the supporting table, the lower pressing part, two torsion tables and torsion parts on the detection machine body, the flywheel energy storage rotating shaft forgings extracted from the same batch can be pressed by the lower pressing part first and then inputted with torsion loads by the two torsion parts to the end of the workpiece, so that the effects of lower pressing load detection and torsion load detection can be achieved in the same detection device.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage shaft forging technology, specifically to a device for testing the strength and reliability of flywheel energy storage shaft forgings. Background Technology

[0002] Flywheel energy storage devices store and release energy through the high-speed rotation of a flywheel. The shaft, as a key load-bearing component between the flywheel and supporting and transmission parts, directly affects the operational safety of the device. Flywheel energy storage shafts are mostly formed from forgings. Although forgings from the same batch undergo similar forging, heat treatment, and machining processes, localized strength fluctuations may still occur due to differences in billet condition, cooling conditions, or stress release. Therefore, after mass production, it is usually necessary to sample parts for strength and reliability testing.

[0003] Current sampling inspection methods mostly employ static load-bearing verification. This involves supporting the shaft forging and applying static downward pressure using a pressure head or loading mechanism to observe the deformation, cracks, or load-bearing status of the shaft forging under static load. This method can reflect the static compressive or bending resistance of the sampled parts and, based on this, determine the overall quality status of the same batch of shaft forgings.

[0004] However, during startup, braking, energy release, and sudden load changes, the flywheel energy storage shaft is not only subjected to static downward pressure, but also to downward impact and torsional impact caused by sudden torque changes. If only static downward pressure testing is performed during sampling inspection, the tested state will deviate from the actual combined impact service state, making it difficult to detect the risk of local failure of the shaft forging under the combined action of downward and torsional impacts in advance, thus affecting the accuracy of batch strength reliability assessment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device for testing the strength and reliability of flywheel energy storage shaft forgings, aiming to alleviate the aforementioned problems to at least some extent.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A device for testing the strength and reliability of flywheel energy storage shaft forgings, comprising:

[0008] Detect the body;

[0009] A support platform, located on the testing machine body, is used to support the workpiece to be tested;

[0010] A top support is provided on the top of the testing machine body, and a pressure box is provided at the bottom of the top support, and a pressure component is provided inside the pressure box;

[0011] Two torsion tables are mounted on the testing machine body, and torsion components are provided on the torsion tables;

[0012] A pressing component is disposed between the pressing housing and the pressing member, and is used to drive the pressing member to apply downward pressure to the workpiece;

[0013] A torsion component is disposed between the detection body and the torsion table, for driving at least one of the torsion tables to rotate about the axis corresponding to the torsion component;

[0014] A positioning component is disposed between the pressure chamber and the two torsion tables. When the pressure chamber moves downward to a predetermined position, it drives the two torsion tables to move toward the workpiece and drives the workpiece to rotate around its own axis to the alignment state.

[0015] Preferably, a plurality of first rollers are rotatably connected to the support platform, and the plurality of first rollers are spaced apart along the axial direction of the workpiece.

[0016] Preferably, a pressing platform is slidably connected to the bottom of the pressing box, and a plurality of second rollers are rotatably connected to the pressing platform. The plurality of second rollers are used to roll in contact with the outer peripheral surface of the workpiece, and a first chain drive mechanism is provided between two adjacent second rollers.

[0017] Preferably, the pressing component includes a first hydraulic cylinder disposed on the pressing housing, and the piston shaft of the first hydraulic cylinder is connected to the pressing component.

[0018] Preferably, the torsion component includes an arc-shaped guide rail connected to the interior of the testing machine body, an arc-shaped guide groove that cooperates with the arc-shaped guide rail is provided on the torsion table, a second oil cylinder is provided inside the testing machine body, a top contact bracket is connected to the piston shaft of the second oil cylinder, a connection opening is provided on the torsion table, and the top of the connection opening forms an inclined top contact surface.

[0019] Preferably, the end of the workpiece is provided with a flat key, and the inner wall of the torsion member is provided with a keyway adapted to the flat key. When the workpiece is in the alignment state, the flat key is aligned with the keyway, so that when the torsion member is sleeved on the end of the workpiece, the flat key enters the keyway.

[0020] The positioning component includes a connecting plate slidably connected to the lower pressure box, a first spring connecting the connecting plate and the lower pressure box, a drive shaft rotatably connected to the lower pressure platform, a second chain drive mechanism between the drive shaft and one of the second rollers, a rack connected inside the lower pressure box, the drive shaft extending to the rack and connected to a gear meshing with the rack.

[0021] Preferably, the positioning component further includes a threaded tube rotatably connected to the detection body, a connecting bracket connected to the detection body, a lead screw slidably connected to the connecting bracket and threadedly engaged with the threaded tube, a connecting plate fixedly connected to the torsion table, a connecting ring rotatably connected to the axis of the connecting plate, the connecting ring being fixed to the lead screw, and a coil spring provided between the connecting ring and the connecting plate.

[0022] Preferably, a spool is fixed to the outer wall of the threaded tube, a traction rope is wound on the spool, one end of the traction rope is connected to the spool, and the other end extends upward and is connected to the pressure box. A torsion spring is connected between the spool and the detection machine body.

[0023] Preferably, a push rod is slidably connected to the end of the lead screw, the push rod extends into the interior of the torsion member, a limiting plate is connected to the push rod, a second spring is connected between the limiting plate and the lead screw, a plurality of limiting shafts are connected to the limiting plate, and a limiting notch is provided on the side wall of the torsion member to slide with the limiting shafts.

[0024] Preferably, a third hydraulic cylinder is connected to the top support, and the piston shaft of the third hydraulic cylinder is connected to the lower pressure box.

[0025] In summary, the present invention has the following main beneficial effects:

[0026] This application, by setting a support platform, a pressing component, two torsion tables, and a torsion component on the testing machine, allows flywheel energy storage shaft forgings sampled from the same batch to be supported. First, the pressing component applies downward pressure, and then the two torsion components input torsional loads to the ends of the workpiece. This achieves the effect of simultaneously testing both downward and torsional loads within the same testing device. Compared to methods that judge the strength of sampled parts solely through static pressing, this application places the workpiece in a state closer to the combined stress state of the flywheel energy storage shaft during startup, braking, energy release, and sudden load changes. In particular, it can expose the risk of local deformation, shear damage, or crack propagation in the end connection section, keyway connection area, and shoulder transition area when downward and torsional forces coexist, thereby improving the accuracy of batch strength reliability assessment.

[0027] This application utilizes a positioning component that, during the descent of the pressure chamber, coordinates the movement of the pressure table, the second roller, the rack and pinion, the threaded pipe, the lead screw, and the torsion table. This causes the workpiece to first roll between the first and second rollers to adjust its angle, and then the torsion component approaches the workpiece from both ends, forming a circumferential limiting fit with the keyway and flat key. This achieves automatic alignment, axial centering, and reliable torque transmission. Since the flat key angle is random after the workpiece is placed, directly rigidly pushing the torsion component can easily lead to problems such as the flat key hitting the end face of the torsion component, keyway misalignment, or eccentric pressure on the workpiece. This application separates the alignment and detection stages through rolling friction driving the workpiece to rotate, a torsion spring elastically pushing the torsion table, a push rod releasing the temporary limit, and the rack's smooth section disengaging. This reduces clamping damage and ensures that the pressure component can be aligned and pressed down, and that the torsional load can be stably input. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the positioning component structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the torsion table structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the support platform structure of the present invention;

[0032] Figure 5 This is a schematic diagram of the torsion member structure of the present invention;

[0033] Figure 6 This is a cross-sectional schematic diagram of the pressure box structure of the present invention;

[0034] Figure 7 This is a cross-sectional schematic diagram of the torsion table structure of the present invention;

[0035] Figure 8 This is a schematic diagram of the limiting piece structure of the present invention.

[0036] Figure label:

[0037] 1. Inspection body; 2. Support platform; 3. Workpiece; 4. Top support; 5. Lower pressure box; 6. Lower pressure component; 7. Torsion table; 8. Torsion component; 9. Flat key; 10. Keyway; 11. First roller; 12. Lower pressure platform; 13. Second roller; 14. First chain drive mechanism; 15. First hydraulic cylinder; 16. Arc-shaped guide rail; 17. Arc-shaped guide groove; 18. Second hydraulic cylinder; 19. Top contact support; 20. Connection opening; 21. Top contact surface ; 22. Connecting plate; 23. First spring; 24. Drive shaft; 25. Second chain drive mechanism; 26. Rack; 27. Gear; 28. Threaded pipe; 29. ​​Connecting bracket; 30. Lead screw; 31. Connecting disc; 32. Connecting ring; 33. Coil spring; 34. Coil shaft; 35. Traction rope; 36. Torsion spring; 37. Push rod; 38. Limiting plate; 39. Second spring; 40. Limiting shaft; 41. Limiting notch; 42. Third hydraulic cylinder. Detailed Implementation

[0038] 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.

[0039] refer to Figures 1-8 This embodiment provides a strength and reliability testing device for flywheel energy storage shaft forgings, used to perform compressive load and torsional load tests on workpiece 3 extracted from the same batch of flywheel energy storage shaft forgings. Workpiece 3 is the flywheel energy storage shaft forging to be tested, and at least one end of workpiece 3 is provided with a flat key 9. The flat key 9 is used to form a circumferential limiting fit with the subsequent torsional loading structure, so that the torsional force can be transmitted to workpiece 3.

[0040] The testing device includes a testing body 1, a support platform 2, a top bracket 4, a pressure box 5, a pressure component 6, two torsion tables 7, a torsion component 8, a pressure component, a torsion component, and a positioning component. The testing body 1 serves as the mounting base for each testing structure. The support platform 2 is mounted on the testing body 1 to support the workpiece 3 to be tested. The support platform 2 supports the middle or a predetermined support area of ​​the workpiece 3, allowing the two ends of the workpiece 3 to face the two torsion tables 7 respectively, facilitating subsequent torsional loading.

[0041] The top support 4 is located on top of the testing body 1, and the pressure chamber 5 is connected to the top support 4 and can move up and down relative to the testing body 1. The pressure member 6 is located inside the pressure chamber 5 and faces the workpiece 3 on the support platform 2. The pressure component is located between the pressure chamber 5 and the pressure member 6, and is used to drive the pressure member 6 to move up and down relative to the pressure chamber 5. When the workpiece 3 is placed on the support platform 2, the pressure chamber 5 can move to a position close to the workpiece 3, and the pressure component then drives the pressure member 6 to act downward on the workpiece 3, so that the workpiece 3 is subjected to downward pressure. Through this pressing process, the deformation, crack propagation, or load-bearing state of the workpiece 3 under the action of downward pressure load can be detected.

[0042] Two torsion tables 7 are mounted on the testing body 1, located on opposite sides of the support platform 2. Each torsion table 7 is equipped with a torsion member 8, which is used to engage the end of the workpiece 3. The torsion mechanism is positioned between the testing body 1 and the torsion table 7, and is used to drive at least one torsion table 7 to rotate around the axis of the corresponding torsion member 8. Since the torsion member 8 can form a circumferential force transmission relationship with the workpiece 3 after engaging the end of the workpiece 3, the rotation of the torsion table 7 can apply torsional impact or torsional load to the workpiece 3 through the torsion member 8, so that the workpiece 3 is in a torsional stress state close to that of actual service.

[0043] The inner wall of the torsion member 8 is provided with a keyway 10 that matches the flat key 9. When the workpiece 3 is placed on the support platform 2, the initial angle of the flat key 9 may not correspond to the keyway 10. If the torsion member 8 is directly pushed to fit the end of the workpiece 3, the flat key 9 and the end face of the torsion member 8 may abut each other and fail to fit smoothly. Therefore, in this embodiment, a positioning component is provided between the pressure box 5 and the two torsion tables 7. The positioning component is used to drive the two torsion tables 7 toward the workpiece 3 when the pressure box 5 moves downward to a predetermined position, and to drive the workpiece 3 to rotate around its own axis to the alignment state.

[0044] During the specific testing process, workpiece 3, selected from the same batch, is first placed on the support platform 2, with both ends of workpiece 3 facing the two torsion pieces 8 respectively. Then, the pressure chamber 5 is moved downwards relative to the testing machine body 1. After the pressure chamber 5 moves to the predetermined position, the positioning component begins to act on the two torsion pieces 7, causing them to move towards the workpiece 3. As the torsion pieces 8 approach the end of the workpiece 3, the positioning component also drives the workpiece 3 to rotate around its own axis, gradually adjusting the flat key 9 at the end of the workpiece 3 to the position corresponding to the keyway 10 on the inner wall of the torsion piece 8. When the workpiece 3 is in the aligned state, the flat key 9 aligns with the keyway 10, the torsion piece 8 continues to fit over the end of the workpiece 3, and the flat key 9 enters the keyway 10, thus forming a reliable circumferential limiting fit between the torsion piece 8 and the end of the workpiece 3.

[0045] After workpiece 3 has completed its support, alignment, and fitting, the pressing component drives the pressing component 6 to apply downward pressure to workpiece 3, and the torsion component drives at least one torsion table 7 to rotate around the axis of the corresponding torsion component 8, so that the torsion component 8 transmits the torsional load to workpiece 3 through the cooperation of the keyway 10 and the flat key 9. Since the flat key 9 is a structure at the end of workpiece 3 used to transmit circumferential force, after the keyway 10 of the torsion component 8 cooperates with the flat key 9, the torsional load can be input along the circumferential force transmission position of workpiece 3 during actual service, rather than simply relying on the frictional force after clamping the outer circle of workpiece 3 to transmit torque. This can reduce the problems of slippage, clamping indentation, and excessive clamping force interfering with the test results, and make the input position and force transmission path of the torsional load closer to the actual stress state of workpiece 3 in the flywheel energy storage device.

[0046] Simultaneously, when the positioning component moves the pressure box 5 to the predetermined position, it first drives the workpiece 3 to rotate around its own axis until the flat key 9 and keyway 10 are aligned. Then, the torsion component 8 is fitted onto the end of the workpiece 3. This avoids the flat key 9 and the end face of the torsion component 8 abutting when the torsion component 8 approaches the workpiece 3. If alignment is not performed, the torsion component 8 is prone to jamming, bumping, or misalignment during the fitting process. This not only affects the efficiency of inspection and assembly but may also cause non-inspection damage to the edges of the flat key 9 and keyway 10 or the end of the workpiece 3 before formal inspection, thus affecting the subsequent strength and reliability judgment. By aligning before fitting, a stable circumferential limiting fit can be formed between the torsion component 8 and the end of the workpiece 3 during each sampling inspection, so that the torsional load can be reliably and repeatedly transferred to the workpiece 3.

[0047] Therefore, this embodiment can not only apply downward pressure to the workpiece 3 through the pressing component 6, but also apply torsional load with a clearly defined force transmission position to the workpiece 3 through the cooperation of the flat key 9 and the keyway 10. Compared with the sampling inspection method that only performs static downward pressure verification, this embodiment can further simulate the state of the flywheel energy storage shaft under the combined influence of downward pressure and torsional action during startup, braking, energy release, and load change. Compared with the method of simply clamping the outer circle for torsional loading, this embodiment can reduce the influence of clamping friction instability on torsional detection, and make the transmission mating area at the shaft end, the connection area of ​​the flat key 9, and the transition area of ​​adjacent shaft shoulders more likely to expose the risk of local strength deficiency, shear deformation, or crack propagation, thereby improving the accuracy of strength reliability judgment of the same batch of shaft forgings.

[0048] Based on the above embodiment, a plurality of first rollers 11 are rotatably connected to the support platform 2. The plurality of first rollers 11 are arranged at intervals along the axial direction of the workpiece 3 and are used to roll in contact with the outer peripheral surface of the workpiece 3. After the workpiece 3 is placed on the support platform 2, the plurality of first rollers 11 support the workpiece 3, so that the workpiece 3 can be stably positioned between the two torsion members 8.

[0049] When the positioning component drives the workpiece 3 to rotate around its own axis to align the flat key 9 with the keyway 10, the first roller 11 can roll with the outer circumferential surface of the workpiece 3, thereby converting the sliding friction between the workpiece 3 and the support platform 2 into rolling friction. This reduces the rotational resistance of the workpiece 3 during the alignment process, avoids problems such as jamming, surface scratches, or inaccurate adjustment of the rotation angle caused by direct friction between the workpiece 3 and the support platform 2, and allows the flat key 9 to be adjusted more smoothly to the position corresponding to the keyway 10.

[0050] Based on the above embodiment, a pressing platform 12 is slidably connected to the bottom of the pressing box 5, and the pressing platform 12 is located on the side of the pressing box 5 facing the support platform 2. Multiple second rollers 13 are rotatably connected to the pressing platform 12, and the multiple second rollers 13 are used for rolling contact with the outer peripheral surface of the workpiece 3. A first chain drive mechanism 14 is provided between two adjacent second rollers 13, so that when one second roller 13 rotates, it can drive the other second rollers 13 to rotate synchronously through the first chain drive mechanism 14.

[0051] After workpiece 3 is placed on support platform 2, the first roller 11 on support platform 2 supports workpiece 3 from below. When the pressure box 5 moves downward to the predetermined position, the pressure platform 12 moves closer to workpiece 3 along with the pressure box 5, so that multiple second rollers 13 contact the outer peripheral surface of workpiece 3 from above. When aligning the flat key 9 at the end of workpiece 3 with the keyway 10 on the inner wall of torsion member 8, one of the second rollers 13 is rotated, and this second roller 13 drives the other second rollers 13 to rotate synchronously through the first chain transmission mechanism 14. Multiple second rollers 13 act synchronously on the outer peripheral surface of workpiece 3, so that workpiece 3 rotates around its own axis under the support of the first roller 11 until the flat key 9 is adjusted to the position corresponding to the keyway 10. In this way, when torsion member 8 is fitted onto the end of workpiece 3, the flat key 9 can smoothly enter the keyway 10, avoiding the flat key 9 from colliding with the end face of torsion member 8.

[0052] This embodiment employs a rolling contact between the second roller 13 and the outer circumferential surface of the workpiece 3. This is intended to accommodate situations where the initial angle of the flat key 9 is uncertain after the workpiece 3 is placed. When the workpiece 3 is rotated by the second roller 13, the second roller 13 provides the rotational tendency to the workpiece 3 solely through frictional contact with its outer circumferential surface, without creating a rigid circumferential lock. Once the flat key 9 is adjusted to the position corresponding to the keyway 10, even if the second roller 13 continues to rotate, it can still roll relative to the outer circumferential surface of the workpiece 3, avoiding further forced rotation of the workpiece 3. Compared to clamping the workpiece 3 and then driving it to rotate, this structure reduces motion resistance during the alignment process of the flat key 9 and the keyway 10, preventing non-detectable damage to the end of the workpiece 3, the flat key 9, or the edge of the keyway 10 during the clamping stage. This allows subsequent pressure and torsion tests to better reflect the strength and reliability of the workpiece 3 itself.

[0053] In practical applications, the workpiece 3 can be picked up and placed by a robot arm that transfers the workpiece 3 selected from the same batch to the support platform 2, and after the inspection is completed, the robot arm removes the workpiece 3 from the support platform 2 so as to connect with the batch sampling inspection process.

[0054] Based on the above embodiments, the pressing component includes a first hydraulic cylinder 15, which is mounted on the pressing housing 5. The piston shaft of the first hydraulic cylinder 15 is connected to the pressing member 6. When the first hydraulic cylinder 15 is working, its piston shaft can extend or retract relative to the pressing housing 5, thereby driving the pressing member 6 to move up and down relative to the pressing housing 5. After the workpiece 3 has completed support, alignment, and end sleeve connection, the first hydraulic cylinder 15 drives the pressing member 6 to move downward, so that the pressing member 6 acts on the predetermined detection position of the workpiece 3 to apply downward pressure to the workpiece 3; after the detection is completed, the first hydraulic cylinder 15 drives the pressing member 6 to reset upward, so that the pressing member 6 leaves the workpiece 3.

[0055] Based on the above embodiments, the torsion component includes an arc-shaped guide rail 16, an arc-shaped guide groove 17, a second hydraulic cylinder 18, and a top contact bracket 19. The arc-shaped guide rail 16 is connected inside the testing machine body 1. The torsion table 7 has an arc-shaped guide groove 17 that cooperates with the arc-shaped guide rail 16. The arc-shaped guide groove 17 and the arc-shaped guide rail 16 are slidably engaged, so that the movement trajectory of the torsion table 7 relative to the testing machine body 1 is restricted to an arc-shaped movement around the axis of the corresponding torsion member 8. Thus, when subjected to force, the torsion table 7 can drive the torsion member 8 to rotate around the end of the workpiece 3.

[0056] The two torsion tables 7 can be designated as a first torsion table and a second torsion table, respectively, and are located on opposite sides of the support platform 2. A second hydraulic cylinder 18 is installed inside the detection body 1, and its piston shaft is connected to a top contact bracket 19. Both the first and second torsion tables have connection openings 20. The top of the connection opening 20 on the first torsion table forms a first top contact surface, and the top of the connection opening 20 on the second torsion table forms a second top contact surface. The inclination directions of the first and second top contact surfaces are opposite.

[0057] When the piston shaft of the second cylinder 18 extends, the top contact bracket 19 moves with the piston shaft and contacts the first and second top contact surfaces respectively. Since the first and second top contact surfaces have opposite inclination directions, when the top contact bracket 19 moves in the same direction, the force generated on the first top contact surface can push the first torsion table to rotate in the first circumferential direction, and the force generated on the second top contact surface can push the second torsion table to rotate in the second circumferential direction opposite to the first circumferential direction. Under the guidance of the corresponding arc-shaped guide rail 16 and arc-shaped guide groove 17, the first and second torsion tables synchronously undergo opposite arc-shaped movements, thereby causing the two torsion members 8 to generate opposite torsional movements around the two ends of the workpiece 3 respectively.

[0058] During the testing process, the flat keys 9 at both ends of the workpiece 3 enter the keyways 10 on the inner walls of the corresponding torsion members 8, forming a circumferential limiting fit between the two ends of the workpiece 3 and the two torsion members 8. At this time, the second hydraulic cylinder 18 drives the top contact bracket 19 to contact the first and second top contact surfaces, causing the first and second torsion tables to rotate in opposite directions. Since the two torsion members 8 act on the two ends of the workpiece 3 respectively, and their rotation directions are opposite, relative torsion can be formed at the two ends of the workpiece 3, rather than causing the workpiece 3 to rotate in the same direction as a whole.

[0059] Through the above structure, the linear output of the second hydraulic cylinder 18 can be converted into the opposite torsional action of the two torsion tables 7 via the top contact bracket 19, the first top contact surface, and the second top contact surface. Compared with the method of driving only one-sided torsion or the two torsion tables 7 rotating in the same direction, the opposite torsion can reduce the tendency of the workpiece 3 to follow the movement as a whole, so that the torsional load is more concentrated on the body of the workpiece 3, which is beneficial to testing the local strength reliability of the shoulder transition section, end connection section, and key 9 connection area of ​​the workpiece 3 under shear action.

[0060] Based on the above embodiment, the positioning component includes a connecting plate 22, a first spring 23, a drive shaft 24, a second chain drive mechanism 25, a rack 26, and a gear 27. The connecting plate 22 is slidably connected inside the pressure box 5 and connected to the pressure table 12, allowing the pressure table 12 to slide up and down relative to the pressure box 5 via the connecting plate 22. The first spring 23 is connected between the connecting plate 22 and the pressure box 5, used to keep the pressure table 12 in its initial position when it is not supported by the workpiece 3, and to provide a reset function after the pressure table 12 slides relative to the pressure box 5.

[0061] A drive shaft 24 is rotatably connected to the lower pressure platform 12, and a second chain drive mechanism 25 is provided between the drive shaft 24 and one of the second rollers 13. A rack 26 is connected inside the lower pressure box 5, and the rack 26 extends along the sliding direction of the lower pressure platform 12 relative to the lower pressure box 5. The drive shaft 24 extends to the rack 26 and is connected to a gear 27 that meshes with the rack 26.

[0062] In operation, the pressure box 5 moves downward, causing the second roller 13 on the pressure table 12 to first contact the outer circumferential surface of the workpiece 3. Since the workpiece 3 is supported by the support platform 2 and the first roller 11, as the pressure box 5 continues to move downward, the pressure table 12 slides relative to the pressure box 5 due to the support of the workpiece 3. The connecting plate 22 slides synchronously with the pressure table 12 and compresses the first spring 23. During this relative sliding process, the transmission shaft 24 moves with the pressure table 12, and the gear 27 meshes and rolls along the rack 26, driving the transmission shaft 24 to rotate. After the transmission shaft 24 rotates, it drives one of the second rollers 13 to rotate via the second chain transmission mechanism 25. This second roller 13 then drives the remaining second rollers 13 to rotate synchronously via the chain transmission mechanism between adjacent second rollers 13.

[0063] After multiple second rollers 13 rotate synchronously, they create a frictional driving effect with the outer circumferential surface of the workpiece 3, causing the workpiece 3 to rotate around its own axis under the support of the first roller 11. Since the initial angle of the flat key 9 at the end of the workpiece 3 cannot be predetermined, the rotation of the second rollers 13 is automatically triggered during the descent of the pressing box 5. This allows the angle of the workpiece 3 to be adjusted before the torsion member 8 is fitted onto the end of the workpiece 3, so that the flat key 9 gradually rotates to the position corresponding to the keyway 10. Once the flat key 9 and the keyway 10 are aligned, the torsion member 8 can smoothly fit onto the end of the workpiece 3, allowing the flat key 9 to enter the keyway 10.

[0064] With the above structure, the descent of the pressure box 5 not only brings the second roller 13 closer to and presses the workpiece 3, but also automatically drives the second roller 13 to rotate by the relative sliding between the pressure table 12 and the pressure box 5, without the need for a separate rotation drive component. The first spring 23 provides elastic clearance space for the pressure table 12 when it contacts the workpiece 3, preventing the pressure box 5 from rigidly pressing the workpiece 3 when it descends; the rack 26, gear 27, drive shaft 24, and second chain drive mechanism 25 convert this clearance displacement into the rotational motion of the second roller 13. This ensures that the workpiece 3 is stably limited between the upper and lower rollers, while also keeping the workpiece 3 in a rotatable state, thereby improving the smoothness and repeatability of the alignment between the flat key 9 and the keyway 10.

[0065] Furthermore, the rack 26 includes a toothed section and a smooth section, with the smooth section located after the toothed section along the sliding direction of the lower pressure platform 12 relative to the lower pressure housing 5. The toothed section is used to mesh with the gear 27 to drive the gear 27, drive shaft 24, and second roller 13 to rotate during the initial sliding phase of the lower pressure platform 12 relative to the lower pressure housing 5; the smooth section does not have tooth profiles for meshing with the gear 27, allowing the gear 27 to disengage from the toothed section when it moves to the smooth section.

[0066] The length of the toothed section is determined based on the diameter of gear 27, the transmission ratio of the second chain drive mechanism 25, the diameter of the second roller 13, and the outer diameter of workpiece 3. This ensures that during the movement of the lower pressure table 12 relative to the lower pressure box 5, the second roller 13 can drive the workpiece 3 to rotate at least one revolution around its own axis. Since the initial angle of the flat key 9 at the end of workpiece 3 cannot be predetermined after it is placed on the support table 2, as long as workpiece 3 can complete at least one revolution, the flat key 9 can pass through the position corresponding to the keyway 10, thus ensuring that the torsion member 8 has the opportunity to be aligned when it subsequently approaches the end of workpiece 3.

[0067] As the pressing table 12 continues to move relative to the pressing box 5 and the gear 27 passes the tooth section, the gear 27 moves to the smooth section. At this point, the gear 27 is no longer constrained by the tooth profile of the rack 26, and the gear 27, drive shaft 24, and second roller 13 are no longer forcibly driven by the rack 26. Thus, after the flat key 9 and keyway 10 are aligned and enter the subsequent torsion detection stage, even if the torsion member 8 causes the workpiece 3 to twist, the relative movement between the outer circumferential surface of the workpiece 3 and the second roller 13 will not affect the second roller 13.

[0068] Based on the above embodiments, the positioning component further includes a threaded tube 28, a connecting bracket 29, a lead screw 30, a connecting disc 31, a connecting ring 32, and a coil spring 33. The threaded tube 28 is rotatably connected to the testing machine body 1, the connecting bracket 29 is connected to the testing machine body 1, and the lead screw 30 is slidably connected to the connecting bracket 29 and threadedly engaged with the threaded tube 28. The connecting bracket 29 guides and prevents the lead screw 30 from rotating synchronously with the threaded tube 28. When the threaded tube 28 rotates, the lead screw 30 can move linearly in the direction of approaching or moving away from the workpiece 3.

[0069] A connecting plate 31 is fixedly connected to the torsion table 7. A connecting ring 32 is axially and rotatably connected to the axis of the connecting plate 31, and the connecting ring 32 is fixed to the end of the lead screw 30 near the torsion table 7. Since the connecting ring 32 and the connecting plate 31 are axially limited, when the lead screw 30 moves in the direction close to the workpiece 3, it can push the torsion table 7 toward the workpiece 3 through the connecting ring 32 and the connecting plate 31; when the lead screw 30 moves in the direction away from the workpiece 3, it can drive the torsion table 7 away from the workpiece 3 through the connecting ring 32 and the connecting plate 31. Since the connecting ring 32 can also rotate relative to the connecting plate 31, after the lead screw 30 pushes the torsion table 7 to complete the approaching action, it will not rigidly restrict the subsequent torsion detection of the torsion table 7 around the axis of the torsion member 8.

[0070] As the pressure chamber 5 moves downward and the workpiece 3 is in a position to be aligned, the threaded tube 28 rotates, and the lead screw 30 pushes the corresponding torsion table 7 toward the workpiece 3. The two torsion tables 7 are located on opposite sides of the support platform 2. Therefore, as the two torsion tables 7 move toward the workpiece 3, the two torsion members 8 approach the ends of the workpiece 3 from both ends. This opposing movement process not only allows the torsion members 8 to engage with the ends of the workpiece 3, but also enables axial alignment of the workpiece 3 from both ends, placing the workpiece 3 at a predetermined detection position between the two torsion members 8, and ensuring that the pressure position of the workpiece 3 corresponds to the downward pressure direction of the pressure member 6. Thus, when the pressure member 6 applies downward pressure to the workpiece 3, the downward pressure can act on the predetermined detection area of ​​the workpiece 3, preventing the workpiece 3 from shifting to one side on the support platform 2, thus avoiding the problem of one side being overly deeply fitted and the other side insufficiently fitted. It also avoids the pressure member 6 being eccentrically pressed against the workpiece 3 due to workpiece 3 misalignment, preventing the detection results from being affected by additional bending moment or eccentric load.

[0071] After the flat key 9 of workpiece 3 has been adjusted to the position corresponding to the keyway 10 by the second roller 13, the two torsion tables 7 continue to move towards each other, so that the two torsion members 8 respectively fit onto both ends of workpiece 3, and the flat key 9 enters the corresponding keyway 10. At this time, both ends of workpiece 3 form a circumferential limiting fit with the torsion members 8. When the subsequent torsion components drive the two torsion tables 7 to rotate in opposite directions, the torsional load can be stably input from both ends of workpiece 3.

[0072] A coil spring 33 is installed between the connecting ring 32 and the connecting plate 31. The coil spring 33 provides a reset function when the torsion table 7 rotates relative to the lead screw 30. In this way, during the formal torsion test, the torsion table 7 can rotate at a certain angle relative to the connecting ring 32, preventing the lead screw 30 and the threaded tube 28 from forming a rigid anti-rotation restriction on the torsion table 7. After the test is completed, the coil spring 33 assists the connecting plate 31 and the torsion table 7 to return to their initial angle, facilitating the next clamping and alignment of the workpiece 3. Through this structure, the pushing action of the lead screw 30 is mainly used to bring the torsion table 7 closer to the workpiece 3 and center it, while the torsion loading action of the torsion table 7 can be performed relatively independently, thereby reducing the interference of the pushing and positioning mechanism on the torsion test process.

[0073] Based on the above embodiment, a reel 34 is fixed to the outer wall of the threaded tube 28, and the reel 34 can rotate synchronously with the threaded tube 28. A traction rope 35 is wound on the reel 34, one end of which is connected to the reel 34, and the other end extends upward and is connected to the lower pressure box 5. A torsion spring 36 is connected between the reel 34 and the detection machine body 1. The torsion spring 36 is used to apply a rotational restoring force to the reel 34 and stores torsional potential energy after being torsioned.

[0074] Initially, the pressure box 5 is in a high position, the traction rope 35 is taut, and the torsion spring 36 is kept in a torsional energy storage state. When the pressure box 5 moves downward, the restraining effect of the traction rope 35 on the reel 34 weakens, the torsion spring 36 releases torsional potential energy and drives the reel 34 to rotate, and the reel 34 synchronously drives the threaded tube 28 to rotate. Since the lead screw 30 is threadedly engaged with the threaded tube 28, and the lead screw 30 is restricted by the connecting bracket 29 and cannot rotate with the threaded tube 28, the rotation of the threaded tube 28 can drive the lead screw 30 to move in a direction closer to the workpiece 3, thereby pushing the torsion table 7 toward the workpiece 3 through the connecting ring 32 and the connecting disc 31.

[0075] In the initial stage of the torsion table 7 moving towards the workpiece 3, the flat key 9 at the end of the workpiece 3 is not necessarily aligned with the keyway 10 on the inner wall of the torsion member 8. At this time, after the torsion member 8 approaches the end of the workpiece 3, the flat key 9 may first contact the end face of the torsion member 8, and the torsion member 8 cannot immediately be fully fitted into the end of the workpiece 3. Since the rotational power of the threaded tube 28 comes from the torsional potential energy released by the torsion spring 36, the advancement of the torsion table 7 is elastic. When the flat key 9 is not aligned, the torsion spring 36 can temporarily maintain the pushing tendency under obstruction, rather than forcibly pressing the torsion member 8 against the flat key 9 through rigid drive, thereby reducing the risk of the flat key 9, the edge of the keyway 10, or the end of the workpiece 3 being damaged during the clamping stage.

[0076] Simultaneously, the descent of the pressure box 5 causes the second roller 13 on the pressure table 12 to contact the outer circumferential surface of the workpiece 3. Through the rack 26, gear 27, drive shaft 24, and second chain drive mechanism 25, the second roller 13 rotates, causing the workpiece 3 to rotate around its own axis under the support of the first roller 11. When the workpiece 3 rotates to the position corresponding to the key 9 and keyway 10, the obstruction of the key 9 to the insertion direction of the torsion member 8 is released. The torsion spring 36 continues to release torsional potential energy, the roller 34 and threaded tube 28 continue to rotate, and the lead screw 30 continues to push the torsion table 7 towards the workpiece 3, allowing the torsion member 8 to smoothly engage with the end of the workpiece 3 and the key 9 to enter the keyway 10.

[0077] With the above structure, the descent of the pressure box 5 can trigger two processes simultaneously: on the one hand, the workpiece 3 is rotated and aligned by the pressure table 12 and the second roller 13; on the other hand, the torsion table 7 is pushed closer to the workpiece 3 by the traction rope 35, torsion spring 36, roller 34 and threaded tube 28. Since the approaching action of the torsion table 7 is provided by the elastic propulsion force of the torsion spring 36, rigid pushing can be avoided when the flat key 9 is not aligned with the keyway 10; after the flat key 9 is rotated to the aligned position, the remaining potential energy of the torsion spring 36 can be used to continue to complete the fitting of the torsion component 8. In this way, the two actions of aligning the flat key 9 and fitting the torsion component 8 can be naturally connected, improving the clamping efficiency of the workpiece 3 and reducing the impact, jamming and non-detectable damage caused by the random angle of the flat key 9.

[0078] Based on the above embodiment, a push rod 37 is slidably connected to one end of the lead screw 30 near the torsion member 8, and extends into the internal space of the torsion member 8 for fitting the end of the workpiece 3. A limiting plate 38 is connected to the push rod 37, and a second spring 39 is connected between the limiting plate 38 and the lead screw 30. Multiple limiting shafts 40 are connected to the limiting plate 38, and a limiting recess 41 is provided on the side wall of the torsion member 8 to slide with the limiting shafts 40. The limiting recess 41 is used to allow the limiting shafts 40 to enter, and the circumferential rotation of the torsion member 8 relative to the lead screw 30 is restricted by the cooperation between the limiting shafts 40 and the limiting recess 41.

[0079] Before the workpiece 3 touches the push rod 37, the second spring 39 keeps the push rod 37 and the limiting piece 38 in their initial positions, at which time the limiting shaft 40 is located in the corresponding limiting recess 41. Since the lead screw 30 is restricted by the connecting bracket 29 and cannot rotate with the threaded tube 28, after the limiting shaft 40 enters the limiting recess 41, it can temporarily limit the torsion member 8 in the circumferential direction during the alignment stage. In this way, when the second roller 13 drives the workpiece 3 to rotate around its own axis to find the corresponding position of the flat key 9 and the keyway 10, even if there is friction between the outer circumferential surface of the workpiece 3 and the torsion member 8, or the flat key 9 contacts the end of the torsion member 8, it is not easy to drive the torsion member 8 and the torsion table 7 to rotate together, thereby preventing the keyway 10 from deviating from its original alignment position as the torsion member 8 rotates.

[0080] When workpiece 3 rotates to the position corresponding to key 9 and keyway 10 under the drive of second roller 13, torsion table 7 continues to move towards workpiece 3 under the pushing action of lead screw 30, so that torsion member 8 is sleeved on the end of workpiece 3. As torsion member 8 is further sleeved on the end of workpiece 3, the end of workpiece 3 touches the push rod 37 and pushes the push rod 37 to slide relative to lead screw 30. When push rod 37 moves, it drives limit plate 38 to move synchronously and causes second spring 39 to deform. The limit shaft 40 on limit plate 38 then exits from the limit recess 41 on the side wall of torsion member 8. After the limit shaft 40 exits from the limit recess 41, the circumferential limit between torsion member 8 and lead screw 30 is released.

[0081] Through the above structure, the torsion member 8 is temporarily limited during the alignment stage of the flat key 9, preventing it from being driven to rotate by friction or contact force when the second roller 13 rotates the workpiece 3. This ensures the stability of the keyway 10 and facilitates the accurate entry of the flat key 9 into the keyway 10. After the torsion member 8 is fitted into place, the end of the workpiece 3 automatically pushes the push rod 37, causing the limiting shaft 40 to disengage from the limiting recess 41. The torsion member 8 and the torsion table 7 can then rotate normally under the action of subsequent torsion components without being continuously locked by the lead screw 30, push rod 37, and limiting shaft 40. Thus, the anti-rotation limitation during the alignment stage and the free torsion during the detection stage can be seamlessly connected, improving the alignment reliability of the flat key 9 and the keyway 10 while avoiding the limiting structure from affecting subsequent torsional impact detection.

[0082] Based on the above embodiment, a third hydraulic cylinder 42 is connected to the top support 4, and the piston shaft of the third hydraulic cylinder 42 is connected to the lower pressure box 5. When the third hydraulic cylinder 42 is working, its piston shaft can extend or retract relative to the top support 4, thereby driving the lower pressure box 5 to move up and down relative to the detection machine body 1. When the lower pressure box 5 moves downward, it can cause the lower pressure table 12, the second roller 13, and the positioning components to gradually approach the workpiece 3 on the support table 2; when the lower pressure box 5 moves upward, it can cause the lower pressure table 12, the second roller 13, and the positioning structure associated with the lower pressure box 5 to move away from the workpiece 3, so as to pick up and put down the workpiece 3.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the strength and reliability of flywheel energy storage shaft forgings, characterized in that, include: Detect the body; A support platform, located on the testing machine body, is used to support the workpiece to be tested; A top support is provided on the top of the testing machine body, and a pressure box is provided at the bottom of the top support, and a pressure component is provided inside the pressure box; Two torsion tables are mounted on the testing machine body, and torsion components are provided on the torsion tables; A pressing component is disposed between the pressing housing and the pressing member, and is used to drive the pressing member to apply downward pressure to the workpiece; A torsion component is disposed between the detection body and the torsion table, for driving at least one of the torsion tables to rotate about the axis corresponding to the torsion component; A positioning component is disposed between the pressure chamber and the two torsion tables. When the pressure chamber moves downward to a predetermined position, it drives the two torsion tables to move toward the workpiece and drives the workpiece to rotate around its own axis to the alignment state.

2. The device for strength and reliability testing of flywheel energy storage shaft forgings according to claim 1, characterized in that, Multiple first rollers are rotatably connected to the support platform, and the multiple first rollers are spaced apart along the axial direction of the workpiece.

3. The device for strength and reliability testing of flywheel energy storage shaft forgings according to claim 1, characterized in that, The bottom of the pressure box is slidably connected to a pressure platform, and multiple second rollers are rotatably connected to the pressure platform. The multiple second rollers are used to roll in contact with the outer peripheral surface of the workpiece, and a first chain drive mechanism is provided between two adjacent second rollers.

4. The device for strength and reliability testing of flywheel energy storage shaft forgings according to claim 1, characterized in that, The pressing component includes a first hydraulic cylinder mounted on the pressing housing, and the piston shaft of the first hydraulic cylinder is connected to the pressing component.

5. The device for strength and reliability testing of flywheel energy storage shaft forgings according to claim 1, characterized in that, The torsion component includes an arc-shaped guide rail connected to the interior of the testing machine body. An arc-shaped guide groove that cooperates with the arc-shaped guide rail is provided on the torsion table. A second oil cylinder is provided inside the testing machine body. A top contact bracket is connected to the piston shaft of the second oil cylinder. A connection opening is provided on the torsion table. The top of the connection opening forms an inclined top contact surface.

6. The device for testing the strength and reliability of flywheel energy storage shaft forgings according to claim 3, characterized in that, The workpiece is provided with a flat key at its end, and the inner wall of the torsion member is provided with a keyway that matches the flat key. When the workpiece is in the alignment state, the flat key is aligned with the keyway, so that when the torsion member is fitted onto the end of the workpiece, the flat key enters the keyway. The positioning component includes a connecting plate slidably connected to the lower pressure box, a first spring connecting the connecting plate and the lower pressure box, a drive shaft rotatably connected to the lower pressure platform, a second chain drive mechanism between the drive shaft and one of the second rollers, a rack connected inside the lower pressure box, the drive shaft extending to the rack and connected to a gear meshing with the rack.

7. The device for strength and reliability testing of flywheel energy storage shaft forgings according to claim 1, characterized in that, The positioning component also includes a threaded tube rotatably connected to the testing machine body. A connecting bracket is connected to the testing machine body. A lead screw that is threadedly engaged with the threaded tube is slidably connected to the connecting bracket. A connecting plate is fixedly connected to the torsion table. A connecting ring is rotatably connected to the axis of the connecting plate. The connecting ring is fixed to the lead screw. A coil spring is provided between the connecting ring and the connecting plate.

8. The device for testing the strength and reliability of flywheel energy storage shaft forgings according to claim 7, characterized in that, A spool is fixed to the outer wall of the threaded tube, and a traction rope is wound on the spool. One end of the traction rope is connected to the spool, and the other end extends upward and is connected to the pressure box. A torsion spring is connected between the spool and the detection machine body.

9. The device for testing the strength and reliability of flywheel energy storage shaft forgings according to claim 7, characterized in that, The end of the lead screw is slidably connected to a push rod, which extends into the interior of the torsion member. A limiting plate is connected to the push rod, and a second spring is connected between the limiting plate and the lead screw. Multiple limiting shafts are connected to the limiting plate, and a limiting notch is provided on the side wall of the torsion member to slide with the limiting shafts.

10. The device for testing the strength and reliability of flywheel energy storage shaft forgings according to claim 1, characterized in that, A third hydraulic cylinder is connected to the top support, and the piston shaft of the third hydraulic cylinder is connected to the lower pressure box.

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