Axle fatigue test device suitable for axles with different lengths

Abstract

The utility model relates to an axle fatigue test device applicable to axles with different lengths, which comprises an axle fixing frame and a pulse head for repeatedly pressing the axle fixed by the axle fixing frame, and is characterized in that the axle fixing frame comprises two fixing seats which are used for fixing two ends of the axle in a one-to-one correspondence manner; the fixing base comprises a ground rail and a lock catch movably connected to the ground rail, the lock catch is used for being connected with the end of an axle to fix the axle, a lock catch fixing structure is arranged between the lock catch and the ground rail, and the lock catch fixing structure is used for enabling the lock catch to be kept and stopped at a set position on the ground rail. And the ground rail extends along the distribution direction of the two fixed seats. The utility model aims to provide the axle fatigue test device which can be suitable for axles with different lengths, and solves the problem that the existing axle fatigue test device is only suitable for axles with one degree and is poor in universality.

Description

Technical Field

[0001] This utility model relates to the field of axle manufacturing technology, specifically to an axle fatigue testing device applicable to axles of different lengths. Background Technology

[0002] The axle is a component of an automobile, including an axle rod and kingpin holes at both ends of the axle rod. The kingpin holes are angled holes with a beveled lower end. The axle has two support positions. In practical use, the steel plate supporting the vehicle frame rests on these support positions, thus supporting the frame on the axle. To improve effortless steering, the intersection of the kingpin hole axis and the ground is optimally located on the boundary line between the center plane of the wheel and the ground. To ensure axle quality, fatigue testing is required before the axle leaves the factory; only those meeting the protection requirements are allowed to leave. Fatigue testing is performed using a fatigue testing device. Chinese Patent No. 2021107853467 discloses an existing axle fatigue testing device. Existing axle fatigue testing equipment has the following shortcomings: poor versatility, unable to meet the testing needs of axles of different lengths; difficulty in assembly when the axle has manufacturing errors; the pulse head presses on the middle of the axle to test the fatigue sample, resulting in a large deviation between the test results and actual usage results; inconvenience in assembling and disassembling the axle; the stress point of this device is on a different plane, making it unable to detect deformation of the annular groove during testing, and the device is easily damaged; the positional relationship between the axle and the device connection point and the device's stress point is inconsistent with the positional relationship between the axle and the wheel's stress point and the wheel's support point during use, leading to a large deviation between the test results and reality; positional deviations are easily generated between the pulse head and the axle; and the testing causes significant damage to the axle. Utility Model Content

[0003] The first objective of this invention is to provide an axle fatigue testing device that can be applied to axles of different lengths, thus solving the problem of poor versatility of existing axle fatigue testing devices that can only be applied to axles of a certain length.

[0004] The second objective of this invention is to provide a vehicle axle fatigue testing device where the stress point during testing is consistent with the stress point of the tire, thus solving the problem that existing vehicle axle fatigue testing devices arbitrarily set the stress point during testing, resulting in significant differences between test data and actual use.

[0005] The third objective of this invention is to provide a vehicle axle fatigue testing device that can finely adjust the stress point, thus solving the problem that the stress point of existing vehicle axle fatigue testing devices cannot be adjusted, which leads to the inconvenience of assembling the vehicle axle when there are manufacturing errors in length.

[0006] The fourth objective of this utility model is to provide a vehicle axle fatigue testing device that is easy to install and disassemble, thus solving the problem of inconvenience in installing and disassembling the vehicle axle in existing vehicle axle fatigue testing devices.

[0007] The fifth objective of this invention is to provide a vehicle axle fatigue testing device that causes minimal damage during testing, thus solving the problem of significant damage to the vehicle axle during testing with existing vehicle axle fatigue testing devices.

[0008] The sixth objective of this utility model is to provide a vehicle axle fatigue testing device in which the stress point of the axle during testing is consistent with the stress point during use, thereby solving the problem of poor test data accuracy caused by the inconsistency between the stress point of the axle and the actual stress point during testing in existing vehicle axle fatigue testing devices.

[0009] The seventh objective of this invention is to provide a vehicle axle fatigue testing device that prevents the relative position between the pulse head and the axle from shifting, thus solving the problem of poor consistency between the connection point of the pulse head and the axle when testing different vehicle axles in existing vehicle axle fatigue testing devices.

[0010] The above technical problems are solved by the following technical solution: an axle fatigue testing device applicable to axles of different lengths, comprising an axle fixing frame and a pulse head for repeatedly pressing the axle fixed by the axle fixing frame, characterized in that the axle fixing frame includes two fixing seats, which are used to fix the two ends of the axle one-to-one. Each fixing seat includes a ground rail and a latch movably connected to the ground rail. The latch is used to connect to the end of the axle to fix the axle. A latch fixing structure is provided between the latch and the ground rail. The latch fixing structure is used to keep the latch stopped at a set position on the ground rail. The ground rail extends along the distribution direction of the two fixing seats. In use, the latch fixing structure is loosened, allowing the latch to move on the ground rail to fix axles of different lengths. The two ends of the axle are fixed by the two latches, thus fixing the axle on the axle fatigue testing device. The latch fixing structure is tightened to keep the axle in the current position. Then, the pulse head is repeatedly pressed a set number of times to test the fatigue resistance of the axle. This technical solution enables testing of axles of different lengths.

[0011] Preferably, the locking structure includes a rail groove extending along the rail's extension direction on the upper surface of the rail, a rail locking bolt with its threaded end facing downwards inserted into the lock, and a rail locking nut connected to the rail locking bolt. The lower end of the rail groove has a widened portion, and the rail locking nut is inserted within the widened portion. The process of adjusting the lock is as follows: loosen the rail locking bolt, then move the lock to the set position, and then rotate the rail locking bolt to engage with the rail locking nut to clamp the rail, thereby maintaining the lock in its current position. This allows for continuous adjustment of the lock's position on the rail.

[0012] Preferably, the locking mechanism includes a connecting pin for inserting into the master pin hole of the axle, a lower support seat connected to the ground rail via the locking mechanism, an upper support seat supported on the lower support seat via a rotating shaft, and a connecting pin fixing structure on the upper support seat for fixing the connecting pin. The axis of the connecting pin intersects the axis of the rotating shaft, which is perpendicular to the extension direction of the ground rail, and is fixed to the upper support seat. In use, the connecting pin is inserted into the master pin hole of the axle and then fixed by the connecting pin fixing structure to prevent it from falling off. This structure ensures that the stress effect during the axle test is consistent with the stress effect during actual use, thus making the test data reflect actual usage data. The rotating shaft support allows the shaft to rotate and provide space when the axle deforms under stress, making the axle fatigue testing device less prone to damage. This achieves the second objective of the invention.

[0013] Preferably, a rotating sleeve is fitted onto the rotating shaft, and the rotating shaft is supported on a preferred support base via the rotating sleeve. This reduces wear on the rotating shaft during reciprocating rotation during the testing process, further extending the service life of the vehicle axle fatigue testing device.

[0014] Preferably, the upper support base is a flat plate structure. Reinforcing strips perpendicular to the rotation axis are connected to the lower surfaces of both ends of the upper support base along the extension direction of the rotation axis. Rotation axis connecting ears are connected to the lower surfaces of the reinforcing strips, and the rotation axis passes through and is fixed to the rotation axis connecting ears. This design allows the upper support base to be thin-plate, making it less prone to damage during use.

[0015] Preferably, the pivot connecting lug is connected to the reinforcing strip via a detachable connection structure. This detachable connection structure includes a reinforcing strip groove extending along the reinforcing strip's extension direction on its lower surface, a reinforcing strip locking bolt with its threaded end facing downwards and passing through the upper support, and a reinforcing strip locking nut connected to the locking bolt. The upper end of the reinforcing strip groove has a widened portion, and the reinforcing strip locking nut passes through this widened portion. This allows for easy adjustment of the pivot's position until the axis of the connecting pin intersects with the axis of the pivot, improving manufacturing convenience.

[0016] Preferably, the reinforcing strip is threaded onto the upper support base via a locking bolt, thus securing it together with the upper support base. This method facilitates connection.

[0017] Preferably, each end of the rotating shaft is supported by a limiting fork, and the limiting forks are adjustablely connected to the lower support base in a direction perpendicular to the rotating shaft. In use, by adjusting the position of the limiting forks, the position of the rotating shaft can be changed to achieve fine-tuning of the upper support base position, allowing for convenient connection to the axle fatigue testing device even when the axle has errors. This achieves the third objective of the invention.

[0018] Preferably, the limiting fork includes a vertically telescopic vertical spring, a fork head, an upper shaft head connected to the fork head and passing through the vertical spring, a lower shaft head passing through the lower end of the vertical spring, and a support plate connected to the lower end of the lower shaft head. The support plate has an elongated hole extending perpendicular to the rotation axis. The support plate is fixed to the lower support base by a support plate locking bolt passing through the elongated hole. A horizontal first shaft head is connected to the fork head, passing through one end of a horizontally telescopic transverse spring. The other end of the transverse spring is sleeved on a horizontal second shaft head. A vertical support plate is connected to the horizontal shaft head, abutting against the transverse spring. An adjusting screw is connected to the vertical support plate, passing through a limiting ear on the lower support base. Two fixing nuts that clamp the limiting ear are threaded onto the adjusting screw. The extension direction of the adjusting screw is the same as the extension direction of the elongated hole. This design enables two-dimensional vibration damping, reducing vibration during testing. Furthermore, by adjusting the position of the fixing nuts, the stiffness of the transverse spring can be changed to adapt to different impact force tests.

[0019] Preferably, the upper or lower shaft head is threaded with an adjusting nut that abuts against the vertical spring. This allows adjustment of the vertical spring's stiffness to alter the damping effect.

[0020] Preferably, the connecting pin fixing structure includes an upper support block supporting the lower end of the connecting pin, an upper fixing sleeve sleeved on the upper end of the connecting pin, and a stop plate movably connected to the upper support seat to block the upper end of the connecting pin and prevent it from coming out upwards. In use, the end of the axle passes between the upper support block and the upper fixing sleeve. The connecting pin passes through the upper fixing sleeve and the main pin hole in sequence and is supported on the upper support block. Then, the stop plate blocks the upper end of the connecting pin to prevent it from coming out. This convenient and simulated method of fixing the axle ensures that the test data is consistent with the data during actual use. This achieves the fourth objective of the invention.

[0021] Preferably, the inner diameter of the upper fixed sleeve is larger than the diameter of the connecting pin. The upper support block has a limiting hole that fits onto the lower end of the connecting pin to limit its movement. The upper support block is hinged to the upper support seat via a hinge shaft parallel to the rotation axis. A lower support block is fixed to the upper support seat. The upper support block is supported on the lower support block by a wedge block, which is connected to the upper support seat via a wedge block displacement and positioning mechanism. In use, the wedge block is moved by the wedge block displacement and positioning mechanism to change the tilt angle of the upper support block, allowing it to be face-fitted and supported on the lower end face of the axle's kingpin hole. This allows axles with different tilt angles of the lower end face of the kingpin hole to be face-fitted and supported on the upper support block for testing, thereby reducing damage to the lower end face of the kingpin hole during testing and affecting the axle's use. This achieves the fifth objective of the invention.

[0022] Preferably, the wedge block is thicker at one end facing the upper support and thinner at the other end. The upper support block is in contact with and supports the upper surface of the wedge block. The wedge block positioning mechanism includes an adjusting bolt threaded onto the upper support and a push block connected to the adjusting bolt, which abuts against the end face of the wedge block facing the upper support. The push block abuts against the wedge block surface. In use, the wedge block is moved by rotating the adjusting bolt, and it can be positioned after adjustment. The adjusting bolt serves both positioning and adjustment functions.

[0023] Preferably, the contact surfaces of the push block and the wedge block are parallel to the hinge shaft. This avoids skewed movement when adjusting the wedge block and improves the reliability of the adjustment.

[0024] Preferably, the connecting pin and the main pin hole are in a clearance fit, which facilitates assembly and disassembly.

[0025] Preferably, a tightening bolt, threaded onto the upper support and abutting against the axle, is included to abut the connecting pin against the wall of the kingpin hole. This ensures easy assembly and disassembly while preventing displacement between the connecting pin and the axle during testing, which could lead to wear of the kingpin hole. In use, the axle and connecting pin are first separated to their extreme positions, and then tightened with the tightening bolt. This effectively creates relative movement between the connecting pin and the frame, thus aligning the kingpin hole.

[0026] Preferably, the center lines of the tightening bolt and the connecting pin are located on the same vertical plane. This results in better tightening performance.

[0027] Preferably, the upper support includes an upper support base plate, two upper support upright plates whose lower ends are connected to the upper support base base plate, and an upper support connecting block connecting the two upper support upright plates together. The tightening bolt passes through both the upper support connecting block and the two upper support upright plates. This design saves materials, has good structural strength, and is lightweight.

[0028] Preferably, a barrier plate fixing block is provided on the side of one upper support plate facing another upper support plate. The barrier plate is fixed to the upper end of the upper support by a barrier plate connecting bolt that passes through the barrier plate from top to bottom and is threaded onto the barrier plate fixing block. This method is convenient and safe when fixing the barrier plate.

[0029] Preferably, the barrier plate connecting bolts pass through the barrier plate fixing block, and the barrier plate fixing thread is threadedly connected to a barrier plate fixing nut located below the barrier plate fixing block. This prevents the barrier plate connecting bolts from loosening.

[0030] Preferably, the system also includes a barrier plate resistance bolt that is threadedly connected to the upper support at the end of the barrier plate away from the connecting pin. This reduces the stress on the barrier plate connecting bolt and improves the reliability of the barrier plate during fixing.

[0031] Preferably, the device also includes a pressing frame. The axle has two support positions supporting the frame, and the pressing frame has two support legs. The two support legs support the two support positions one-to-one, and the pulse head presses against the pressing frame. This ensures that the stress point during the test is the actual stress point of the axle during use, thereby improving the accuracy of the test data. This achieves the sixth objective of the invention.

[0032] Preferably, the support leg includes a lower section and an upper section. The lower section rests on the support position, and the upper section is movably supported on the lower section. The upper section is connected to the pressing frame. This design prevents wear caused by elastic deformation of the pressing frame during testing between the upper and lower sections of the support leg, thus avoiding wear on the axle support position and preventing damage to the axle during testing.

[0033] Preferably, the axle has weight-reducing grooves on both its front and rear sides, and the lower section of the support leg has two downward-facing limiting ears extending beyond the lower section of the support leg. The axle passes between the two limiting ears, and the limiting ears are connected to support leg fixing bolts that are tightened into the weight-reducing grooves. This ensures that the lower section of the support leg is reliably connected to the support position.

[0034] Preferably, the upper section of the support leg is supported on the lower section of the support leg by support rollers, the support rollers being parallel to the axis of rotation, and a clearance is provided between the upper and lower sections of the support leg. This minimizes wear between the upper and lower sections of the support leg when the pressing frame undergoes elastic deformation during the test.

[0035] Preferably, the upper surface of the lower section of the support foot is provided with a groove, and the support roller is located in the groove. This ensures that the clearance is short enough while avoiding excessive clearance that would result in a large overall size.

[0036] Preferably, the lower part of the support foot is threaded with two limiting rods located on both radial sides of the support roller. A roller limiting block is rotatably connected to one end of the limiting rod facing the support roller. The lower end of the roller limiting block abuts against the bottom surface of the groove, and the upper end extends beyond the axis of the support roller. This design prevents the support roller from detaching and ensures a compact structure.

[0037] Preferably, the limiting rod is threaded onto a limiting rod connecting nut, which is then fixed to the lower section of the support leg. This conveniently achieves the threaded connection between the limiting rod and the lower section of the support leg.

[0038] Preferably, the roller limiting block is provided with a limiting rod connecting hole, and the inner end of the limiting rod connecting hole is provided with a large-diameter section. The limiting rod is connected to a connecting hook located in the large-diameter section for hooking onto the overlapping section. This can prevent the rotation of the blocking plate connecting bolts and drive the roller limiting block to translate while keeping the roller limiting block partially rotating.

[0039] Preferably, the device also includes a pressing frame with a pulse head limiting hole. The pulse head passes through the pulse head limiting hole and presses against the pressing frame. This prevents the pulse head from being misaligned with the axle, improving the reliability of the test. This achieves the seventh objective of the invention.

[0040] Preferably, a pulse head limiting plate is connected to the pressing frame, and the pulse head limiting hole is disposed on the pulse head limiting plate. This design facilitates the setting of the pulse head limiting hole and allows for easy replacement if the pulse head limiting hole is damaged.

[0041] Preferably, the pulse head limiting plate is detachably connected to the pressing frame, making replacement convenient.

[0042] The beneficial effects of this utility model are: it can be applied to the testing of axles of different lengths; the connection position between the pulse head and the axle is consistent when testing different axles; it is convenient to connect and disassemble the axle; it causes little damage to the axle; the equipment is not easily damaged; the position can be finely adjusted so that it can be assembled even if there are manufacturing errors in the axle; the positional relationship between the connection point of the axle and the equipment and the support point of the equipment during testing is consistent with the connection relationship between the axle and the wheel when the axle is in use. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the present invention.

[0044] Figure 2 for Figure 1 A magnified view of a portion of point A;

[0045] Figure 3 for Figure 2 A magnified view of a portion of point B;

[0046] Figure 4 for Figure 1 A magnified view of a portion at point C;

[0047] Figure 5 This is a schematic diagram of the mounting bracket;

[0048] Figure 6 for Figure 5 A magnified view of a portion at point D;

[0049] Figure 7 for Figure 5 A magnified view of a portion of point E.

[0050] In the diagram: 1. Axle; 2. Pulse head; 3. Mounting seat; 4. Ground rail; 5. Locking bolt; 6. Connecting lug bolt; 7. Ground rail locking nut; 8. Ground rail groove widening section; 9. Connecting pin; 10. Lower support seat; 11. Rotating shaft; 12. Upper support seat; 13. Rotating sleeve; 14. Reinforcing strip; 15. Rotating shaft connecting lug; 16. Limiting lug; 17. Reinforcing strip locking bolt; 18. Reinforcing strip locking nut; 19. Reinforcing strip groove widening section; 20. Upper support seat locking bolt; 21. Limiting fork; 22. Vertical spring; 23. Fork head; 24. Upper axle head; 25. Lower axle head; 26. Support plate; 27. Long slot; 28. Support plate locking bolt; 29. ​​First horizontal axle head; 30. Lateral spring; 31. Second horizontal axle head; 32. Vertical support plate; 33. Adjusting screw; 34. Fixing nut; 35. Adjusting nut; 36. Upper support block. 7. Upper fixed sleeve 38, barrier plate 80, limiting hole 39, hinge shaft 40, lower support block 41, wedge block 42, adjusting bolt 43, push block 44, tightening bolt 45, upper support base plate 46, upper support base upright plate 47, upper support base connecting block 48, barrier plate fixing block 49, barrier plate connecting bolt 50, barrier plate fixing nut 51, barrier plate resistance bolt 52, pressing frame 53, support position 54, support foot 55, lower section of support foot 56, upper section of support foot 57, weight reduction groove 58, limiting ear 59, support foot fixing bolt 60, support roller 61, clearance gap 62, groove 63, limiting rod 64, roller limiting block 65, limiting rod connecting nut 66, connecting hook head 67, pulse head limiting hole 68, pulse head limiting plate 69, limiting plate connecting bolt 70, main pin hole 81. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0052] See Figures 1 to 7 A fatigue testing device for vehicle axles of different lengths includes an axle holder and a pulse head 2 that repeatedly presses the axle 1 fixed in place by the axle holder. The axle holder includes two mounting bases 3, which correspond to and fix the two ends of the axle. Each mounting base includes a ground rail 4 and a latch 5 movably connected to the ground rail. The latch connects to the end of the axle to fix it in place, and a latch fixing structure is provided between the latch and the ground rail. The latch fixing structure keeps the latch in a set position on the ground rail, which extends along the distribution direction of the two mounting bases.

[0053] In use, the locking mechanism is loosened, allowing the locking mechanism to move on the ground rail to fix axles of different lengths. The two locking mechanisms secure both ends of the axle, thus fixing the axle to the axle fatigue testing device. The locking mechanism is then tightened to maintain the axle in its current position. The pulse head is then repeatedly pressed a set number of times to test the axle's fatigue resistance.

[0054] The locking structure includes a rail groove extending along the rail's extension direction on the upper surface of the rail, a rail locking bolt 7 with its threaded end facing downwards inserted into the lock, and a rail locking nut 8 connected to the rail locking bolt. The lower end of the rail groove has a widened section 9, and the rail locking nut is inserted within the widened section. The process of adjusting the lock is as follows: loosen the rail locking bolt, then move the lock to the set position, and then rotate the rail locking bolt to engage with the rail locking nut to clamp the rail, thereby maintaining the lock in its current position.

[0055] The locking mechanism includes a connecting pin 10 for passing through the master pin hole 81 of the axle, a lower support seat 11 connected to the ground rail via the locking mechanism, an upper support seat 13 supported on the lower support seat via a rotating shaft 12, and a connecting pin fixing structure with a fixed connecting pin on the upper support seat. The axis of the connecting pin intersects the axis of the rotating shaft, which is perpendicular to the extension direction of the ground rail and is fixed to the upper support seat. A rotating sleeve 14 is fitted on the rotating shaft, which is supported on the upper support seat via the rotating sleeve. The upper support seat is a flat plate structure, and reinforcing bars 15 perpendicular to the rotating shaft are connected to the lower surfaces of both ends of the upper support seat along the extension direction of the rotating shaft. A rotating shaft connecting lug 16 is connected to the lower surface of the reinforcing bars, and the rotating shaft passes through and is fixed to the rotating shaft connecting lug. The shaft connecting lug is connected to the reinforcing strip via a detachable connection structure. This detachable connection structure includes a reinforcing strip groove extending along the reinforcing strip's extension direction on its lower surface, a reinforcing strip locking bolt 18 with its threaded end facing downwards, which passes through the upper support seat, and a reinforcing strip locking nut 19 connected to the locking bolt. The upper end of the reinforcing strip groove has a widened portion 20, and the locking nut passes through this widened portion. The reinforcing strip passes through the upper support seat via the upper support seat locking bolt 21 and is threaded onto the reinforcing strip, thus fixing it to the upper support seat. Each end of the shaft is supported by a limiting fork 22, which is adjustablely connected to the lower support seat along a direction perpendicular to the shaft. In use, adjusting the position of the limiting fork changes the position of the shaft, allowing for fine-tuning of the upper support seat position and facilitating easy connection to the axle fatigue testing device even when the axle has errors. The limiting fork includes a vertically telescopic vertical spring 23, a fork head 24, an upper shaft head 25 connected to the fork head and passing through the vertical spring, a lower shaft head 26 passing through the lower end of the vertical spring, and a support plate 27 connected to the lower end of the lower shaft head. The support plate has an elongated hole 28 extending in a direction perpendicular to the rotation axis. The support plate is fixed to the lower support base by a support plate locking bolt 29 passing through the elongated hole. A horizontal first shaft head 30 is connected to the fork head. The horizontal first shaft head passes through one end of a horizontally telescopic transverse spring 31. The other end of the transverse spring is sleeved on a horizontal second shaft head 32. A vertical support plate 33 abutting against the transverse spring is connected to the horizontal second shaft head. An adjusting screw 34 is connected to the vertical support plate and passes through a limiting ear 17 on the lower support base. Two fixing nuts 35 that clamp the limiting ear are threaded onto the adjusting screw. The extension direction of the adjusting screw is the same as the extension direction of the elongated hole. It can perform two-dimensional vibration reduction to reduce vibration during testing. At the same time, the stiffness of the lateral spring can be changed by adjusting the position of the fixing nut to adapt to the vibration reduction effect under different impact force tests. The upper or lower shaft head (upper shaft head in this embodiment) is threaded with an adjusting nut 36 that abuts against the vertical spring.The connecting pin fixing structure includes an upper supporting block 37 supporting the lower end of the connecting pin, an upper fixing sleeve 38 sleeved on the upper end of the connecting pin, and a blocking plate 80 movably connected to the upper support seat to block the upper end of the connecting pin and prevent the connecting pin from coming out upwards. The inner diameter of the upper fixing sleeve is larger than the diameter of the connecting pin. The upper supporting block is provided with a limiting hole 39 sleeved on the lower end of the connecting pin to limit the connecting pin. The upper supporting block is hinged to the upper support seat by a hinge shaft 40, which is parallel to the rotation axis. A lower supporting block 41 is fixed to the upper support seat. The upper supporting block is supported on the lower supporting block by a wedge block 42. The wedge block is connected to the upper support seat by a wedge block displacement and positioning mechanism. The wedge-shaped block is thicker at one end facing the upper support and thinner at the other. The upper support block surface contacts and supports the upper end face of the wedge-shaped block. The wedge-shaped block positioning mechanism includes an adjusting bolt 43 threaded to the upper support and a push block 44 connected to the adjusting bolt and abutting against the end face of the wedge-shaped block facing the upper support. The push block abuts against the wedge-shaped block surface. The contact surfaces of the push block and the wedge-shaped block are parallel to the hinge shaft. The connecting pin and the master pin hole have a clearance fit. It also includes a tightening bolt 45 threaded to the upper support and tightened against the axle, causing the connecting pin to abut against the wall of the master pin hole. The center lines of the tightening bolt and the connecting pin are located on the same vertical plane. The upper support base includes an upper support base base plate 46, two upper support base upright plates 47 connected to the lower end of the upper support base base plate, and an upper support base connecting block 48 connecting the two upper support base upright plates together. A tightening bolt passes through both the upper support base connecting block and the two upper support base upright plates. A baffle plate fixing block 49 is provided on the side of one upper support base upright plate facing the other upper support base upright plate. The baffle plate is fixed to the upper end of the upper support base by a baffle plate connecting bolt 50 that passes through the baffle plate from top to bottom and is threaded onto the baffle plate fixing block. The baffle plate connecting bolt passes through the baffle plate fixing block, and a baffle plate fixing nut 51 located below the baffle plate fixing block is threaded onto the baffle plate fixing thread. It also includes a baffle plate resistance bolt 52 threaded onto the upper support base, which blocks the baffle plate at the end furthest from the connecting pin. It also includes a pressing frame 53. The axle has two support positions 54 for supporting the frame. The pressing frame has two support feet 55, which support the two support positions one-to-one. The pulse head presses on the pressing frame. The support foot includes a lower section 56 and an upper section 57. The lower section supports the support position, and the upper section supports the lower section movably. The upper section is connected to the pressing frame. The axle has weight-reducing grooves 58 on both the front and rear sides. The lower section of the support foot is connected to two limiting ears 59 extending downwards from the lower section of the support foot by connecting lug bolts 6. The axle passes between the two limiting ears, and the limiting ears are connected to support foot fixing bolts 60 that are tightened into the weight-reducing grooves. The upper section of the support foot is supported on the lower section of the support foot by support rollers 61. The support rollers are parallel to the rotating shaft, and there is a clearance 62 between the upper section and the lower section of the support foot.The upper surface of the lower section of the support foot has a groove 63, and the support roller is located in the groove. Two limiting rods 64 located on both radial sides of the support roller are threaded onto the lower section of the support foot. The end of the limiting rod facing the support roller is rotatably connected to a roller limiting block 65. The lower end of the roller limiting block abuts against the bottom surface of the groove, and the upper end extends beyond the axis of the support roller. The limiting rod is threaded onto a limiting rod connecting nut 66, which is fixed to the lower section of the support foot. The roller limiting block has a limiting rod connecting hole, and the inner end of the limiting rod connecting hole has a large diameter section. The limiting rod is connected to a connecting hook 67 located in the large diameter section for hooking onto the overlapping section. The pressing frame has a pulse head limiting hole 68, and the pulse head passes through the pulse head limiting hole and presses against the pressing frame. A pulse head limiting plate 69 is connected to the pressing frame, and the pulse head limiting hole is located on the pulse head limiting plate. The pulse head limiting plate is detachably connected to the pressing frame, specifically by connecting bolts 70 to the limiting plate.

Claims

1. An axle fatigue testing device applicable to axles of different lengths, comprising an axle holder and a pulse head for repeatedly pressing the axle fixed by the axle holder, characterized in that, The axle mounting bracket includes two mounting seats, which are used to fix the two ends of the axle in a one-to-one correspondence. Each mounting seat includes a ground rail and a latch movably connected to the ground rail. The latch is used to connect to the end of the axle to fix the axle. A latch fixing structure is provided between the latch and the ground rail. The latch fixing structure is used to keep the latch stopped in a set position on the ground rail. The ground rail extends along the distribution direction of the two mounting seats.

2. The axle fatigue testing device according to claim 1, applicable to axles of different lengths, is characterized in that, The locking structure includes a rail groove extending along the rail extension direction on the upper surface of the rail, a rail locking bolt with the threaded end facing downward and passing through the lock, and a rail locking nut connected to the rail locking bolt. The lower end of the rail groove is provided with a rail groove widening section, and the rail locking nut passes through the rail groove widening section.

3. The axle fatigue testing device according to claim 1, applicable to axles of different lengths, is characterized in that, The latch includes a connecting pin for passing through the master pin hole of the axle, a lower support seat connected to the ground rail by the latch fixing structure, an upper support seat supported on the lower support base by a rotating shaft, and a connecting pin fixing structure for fixing the connecting pin on the upper base. The axis of the connecting pin intersects the axis of the rotating shaft, the rotating shaft is perpendicular to the extension direction of the ground rail, and the rotating shaft is fixed together with the upper support seat.

4. The axle fatigue testing device according to claim 3, which is applicable to axles of different lengths, is characterized in that, A rotating sleeve is fitted onto the rotating shaft, and the rotating shaft is supported on a preferred support base by the rotating sleeve.

5. An axle fatigue testing device applicable to axles of different lengths according to claim 3 or 4, characterized in that, The upper support base is a flat plate structure. Reinforcing strips perpendicular to the rotating shaft are connected to the lower surfaces of both ends of the upper support base along the extension direction of the rotating shaft. The lower surfaces of the reinforcing strips are connected to rotating shaft connecting ears. The rotating shaft passes through and is fixed on the rotating shaft connecting ears.

6. An axle fatigue testing device applicable to axles of different lengths according to claim 3 or 4, characterized in that, Each end of the rotating shaft is supported on a limiting fork, and the limiting fork is adjustablely connected to the lower support base in a direction perpendicular to the rotating shaft.

7. The axle fatigue testing device according to claim 6, applicable to axles of different lengths, is characterized in that, The limiting fork includes a vertically telescopic vertical spring, a fork head, an upper shaft head connected to the fork head and passing through the vertical spring, a lower shaft head passing through the lower end of the vertical spring, and a support plate connected to the lower end of the lower shaft head. The support plate has an elongated hole extending in a direction perpendicular to the rotation axis. The support plate is fixed to the lower support base by a support plate locking bolt passing through the elongated hole. A horizontal first shaft head is connected to the fork head. The horizontal first shaft head passes through one end of a horizontally telescopic transverse spring. The other end of the transverse spring is sleeved on a horizontal second shaft head. A vertical support plate that abuts against the transverse spring is connected to the horizontal second shaft head. An adjusting screw on a limiting ear passing through the vertical support plate is connected to the vertical support plate. Two fixing nuts that clamp the limiting ear are threaded onto the adjusting screw. The extension direction of the adjusting screw is the same as the extension direction of the elongated hole.

8. The axle fatigue testing device according to claim 7, which is applicable to axles of different lengths, is characterized in that, An adjusting nut that abuts against the vertical spring is threaded onto the upper or lower shaft head.

9. An axle fatigue testing device applicable to axles of different lengths according to claim 3 or 4, characterized in that, The connecting pin fixing structure includes an upper supporting block that supports the lower end of the connecting pin, an upper fixing sleeve that is sleeved on the upper end of the connecting pin, and a blocking plate that is movably connected to the upper support base to block the upper end of the connecting pin and prevent the connecting pin from coming out upward. The inner diameter of the upper fixing sleeve is larger than the diameter of the connecting pin. The upper supporting block is provided with a limiting hole that is sleeved on the lower end of the connecting pin to limit the connection pin. The upper supporting block is hinged to the upper support base by a hinge shaft that is parallel to the rotation axis. A lower supporting block is fixed to the upper support base. The upper supporting block is supported on the lower supporting block by a wedge block. The wedge block is connected to the upper support base by a wedge block displacement and positioning mechanism.

10. The axle fatigue testing device according to claim 1, applicable to axles of different lengths, characterized in that, It also includes a pressing frame. The axle has two support positions for supporting the frame. The pressing frame has two support legs. The two support legs support the two support positions one-to-one. The pulse head presses on the pressing frame. The support leg includes a lower section and an upper section. The lower section of the support leg supports the support position. The upper section of the support leg is movably supported on the lower section of the support leg. The upper section of the support leg is connected to the pressing frame.

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