Axle fatigue test device with stress point consistent with actual stress point

Abstract

The utility model relates to an axle fatigue test device with a stress point consistent with an actual stress point, which comprises an axle fixing frame, a pulse head and a pressing frame, the axle fixing frame comprises two fixing seats, the two fixing seats are used for fixing the two ends of an axle in a one-to-one correspondence mode, each fixing seat comprises a base and a lock catch connected to the base, and the pressing frame is used for pressing the two ends of the axle. The lock catch is used for being connected with the end of an axle to fix the axle, the axle is provided with two supporting positions for supporting a frame, the pressing frame is provided with two supporting legs, the two supporting legs support the two supporting positions in a one-to-one correspondence mode, and the pulse head is pressed on the pressing frame. The utility model aims to provide the axle fatigue test device which enables the force bearing point of the axle to be consistent with the force bearing point in use during detection, and solves the problem of poor test data accuracy caused by the fact that the force bearing point of the axle is not consistent with the actual force bearing point during detection of the existing axle fatigue test device.

Description

TECHNICAL FIELD

[0001] The utility model relates to axle production technical field, concretely relates to an axle fatigue test device of force point same as actual force point. BACKGROUND

[0002] The axle is a component on the automobile, including axle rod body and main pin hole arranged at both ends of the axle rod body, the main pin hole is inclined hole and the lower end surface is inclined surface, two support positions are arranged on the axle, and the steel plate supporting the frame is supported on the support position during use, so that the frame is supported on the axle. In order to improve the labor-saving property when steering, the intersection point of the axis of the main pin hole and the ground is located on the junction line of the center surface of the wheel and the ground. In order to ensure the quality of the axle, the axle needs to be subjected to fatigue test before leaving the factory, and only the protective requirement can leave the factory. The fatigue test is completed by the fatigue test device. The patent document with Chinese patent No. 2021107853467 discloses an existing axle fatigue test device. The existing axle fatigue test device has the following disadvantages: poor universality, cannot meet the detection of axles of different lengths; when the axle has manufacturing errors, it cannot be conveniently assembled; the pulse head is pressed in the middle part of the axle for fatigue test, the detection result is greatly deviated from the actual result in use; it is inconvenient to assemble and disassemble the axle; the force points of the device are different planes, the deformation of the device during the test cannot be determined, and the device is easy to be damaged; the position relationship between the connection point of the axle and the device and the force point of the device is inconsistent with the position relationship between the force point of the axle and the support point of the wheel during use, resulting in large deviation between the detected result and the actual result; position deviation is easy to occur between the pulse head and the axle; the damage to the axle during detection is large. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a kind of axle fatigue test device, which is consistent with the force point of the axle during use, solves the problem that the force point of the axle during detection is inconsistent with the actual force point in the existing axle fatigue test device, resulting in poor accuracy of test data.

[0004] The above technical problem is solved by the following technical scheme: a vehicle axle fatigue test device with stress points consistent with actual stress points, comprising a vehicle axle fixing frame and a pulse head for repeatedly pressing the vehicle axle fixed by the vehicle axle fixing frame, characterized in that the device further comprises a pressing frame, the vehicle axle fixing frame comprises two fixing seats for one-to-one fixing of two ends of the vehicle axle, the fixing seat comprises a base and a lock buckle connected to the base, the lock buckle is used for connecting with the end of the vehicle axle to fix the vehicle axle, the vehicle axle is provided with two support positions for supporting the two support frames, the pressing frame is provided with two support feet, the two support feet one-to-one support the two support positions, and the pulse head is pressed on the pressing frame. The stress point during the test is the actual stress point during the use of the vehicle axle, thereby improving the accuracy of the test data.

[0005] Preferably, the support foot comprises a support foot lower segment and a support foot upper segment, the support foot lower segment is supported on the support position, the support foot upper segment is movably supported on the support foot lower segment, and the support foot upper segment is connected with the pressing frame. The elastic deformation of the pressing frame during the test can be avoided from causing abrasion between the upper and lower segments of the support foot, the support position of the vehicle axle is not abraded, and damage to the vehicle axle during the test is avoided.

[0006] Preferably, the vehicle axle is provided with a weight reduction groove on the front and rear sides, the support foot lower segment is provided with two limiting ears downwardly protruding from the support foot lower segment, the vehicle axle is arranged between the two limiting ears, and the limiting ears are connected with a support foot fixing bolt tightly arranged in the weight reduction groove. The support foot lower segment can be reliably connected to the support position.

[0007] Preferably, the support foot upper segment is supported on the support foot lower segment through a support roller, the support roller is parallel to the rotation shaft, and an avoiding gap is arranged between the support foot upper segment and the support foot lower segment. The abrasion between the upper and lower segments of the support foot caused by the elastic deformation of the pressing frame during the test is small.

[0008] Preferably, a groove is arranged on the upper end face of the support foot lower segment, and the support roller is located in the groove. The avoiding gap is short enough, and the appearance volume is not large.

[0009] Preferably, two limiting rods are threadedly connected to the support foot lower segment and located on the two sides of the support roller in the radial direction, a roller limiting block is rotationally connected to one end of the limiting rod facing the support roller, the lower end of the roller limiting block abuts against the bottom face of the groove, and the upper end of the roller limiting block protrudes from the axis of the support roller. The support roller is prevented from being pulled out, and the structure is compact.

[0010] As preferred, the limiting rod is threadedly connected to a limiting rod connecting nut, and the limiting rod connecting nut is fixed to the lower section of the supporting leg. The threaded connection of the limiting rod to the lower section of the supporting leg is conveniently achieved.

[0011] As preferred, the roller limiting block is provided with a limiting rod connecting hole, and an inner end of the limiting rod connecting hole is provided with a large diameter section, and the limiting rod is connected to a connecting hook head located in the large diameter section for hooking to the overlapping section. The rotation of the plate connecting bolt and the translation of the roller limiting block can be blocked while the rotation of the roller limiting block part is maintained.

[0012] As preferred, the lock includes a connecting pin for being inserted into the king pin hole of the axle, a lower support base connected to the base through the lock fixing structure, an upper support base supported on the lower support base through the rotating shaft, and a connecting pin fixing structure provided on the upper base for fixing the connecting pin, the axis of the connecting pin intersects with the axis of the rotating shaft, the rotating shaft is perpendicular to the extending direction of the base, and the rotating shaft is fixed with the upper support base. In use, the connecting pin is inserted into the king pin hole of the axle and is fixed by the connecting pin fixing structure to prevent falling off. This structure can make the stress effect of the axle during the test consistent with the stress effect of the axle during actual use, so that the test data is the actual use data. The rotating shaft is supported by the rotating shaft, which can provide space when the axle is deformed under stress, so that the axle fatigue test device is not easily damaged. The second utility model is achieved.

[0013] As preferred, a rotating sleeve is sleeved on the rotating shaft, and the rotating shaft is supported on the lower support base through the rotating sleeve. The wear of the rotating shaft during reciprocating rotation of the test sample is small, which further prolongs the service life of the axle fatigue test device.

[0014] As preferred, the upper support base is a flat plate structure, and a reinforcing strip perpendicular to the rotating shaft is connected to the lower surface of both ends of the upper support base along the extending direction of the rotating shaft, a rotating shaft connecting lug is connected to the lower surface of the reinforcing strip, and the rotating shaft is inserted and fixed in the rotating shaft connecting lug. When the upper support base is a thin plate structure, it is not easily damaged in use.

[0015] As preferred, the rotating shaft connecting lug is connected to the reinforcing strip through a detachable connecting structure, the detachable connecting structure includes a reinforcing strip part groove provided on the lower surface of the reinforcing strip and extending along the extending direction of the reinforcing strip, a reinforcing strip part locking bolt inserted into the upper support base with the threaded end downward, and a reinforcing strip part locking nut connected to the reinforcing strip part locking bolt, an upper end of the reinforcing strip part groove is provided with a reinforcing strip part groove widening part, and the reinforcing strip part locking nut is inserted into the reinforcing strip part groove widening part. The position of the rotating shaft can be conveniently adjusted to intersect the axis of the connecting pin with the axis of the rotating shaft, improving the convenience during production.

[0016] As preferred, the reinforcing bars are fixed with the upper support seat by the upper support seat rear threaded connection of the upper support seat locking bolt. The connection is convenient.

[0017] As preferred, the two ends of the rotating shaft are supported on a limiting fork, which is adjustably connected on the lower support seat along the direction perpendicular to the rotating shaft. In use, the position of the rotating shaft is changed by adjusting the position of the limiting fork to realize the fine adjustment of the position of the upper support seat to facilitate the connection of the axle fatigue test device to the axle with errors.

[0018] As preferred, the limiting fork comprises a vertical spring, a fork head, an upper shaft head connected with the fork head and arranged in the vertical spring, a lower shaft head arranged in the lower end of the vertical spring, and a supporting plate connected with the lower end of the lower shaft head, the supporting plate is provided with a long hole extending along the direction perpendicular to the rotating shaft, the supporting plate is fixed on the lower support seat by the supporting plate locking bolt arranged in the long hole, the fork head is connected with a horizontal first shaft head, the horizontal first shaft head is arranged in one end of a horizontal spring, the other end of the horizontal spring is sleeved on a horizontal second shaft head, the horizontal shaft head is connected with a vertical supporting plate abutting with the horizontal spring, the vertical supporting plate is connected with an adjusting screw rod arranged in the limiting ear on the lower support seat, the adjusting screw rod is threadedly connected with two fixing nuts clamping the limiting ear, and the extension direction of the adjusting screw rod is the same as the extension direction of the long hole. Two-dimensional damping can be realized, the vibration during the test is reduced, and the rigidity of the horizontal spring can be changed by adjusting the position of the fixing nut to adapt to the damping effect during the test of different impact forces.

[0019] As preferred, the upper shaft head or the lower shaft head is threadedly connected with an adjusting nut abutting with the vertical spring. The rigidity of the vertical spring can be adjusted to change the damping effect.

[0020] As preferred, the connecting pin fixing structure comprises an upper holding block held on the lower end of the connecting pin, an upper fixed sleeve sleeved on the upper end of the connecting pin, and a blocking plate movably connected on the upper support seat and shielding the upper end of the connecting pin to prevent the connecting pin from being pulled out upward. In use, the end of the axle is arranged between the upper holding block and the upper fixed sleeve, the connecting pin is supported on the upper holding block after passing through the upper fixed sleeve and the king pin hole in sequence, and then the blocking plate blocks the upper end of the connecting pin to prevent the connecting pin from being pulled out. The fixing is convenient and simulates the actual fixing mode of the axle, so that the test data is consistent with the actual use data. The fourth utility model object is realized.

[0021] As preferred, 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 sleeved on the lower end of the connecting pin to limit the connecting pin, the upper supporting block is hinged to the upper supporting seat through a hinge shaft parallel to the rotating shaft, the lower supporting block is fixed to the upper supporting seat, the upper supporting block is supported on the lower supporting block through a wedge-shaped block, and the wedge-shaped block is connected to the upper supporting seat through a wedge-shaped block moving positioning mechanism. In use, the wedge-shaped block is moved through the wedge-shaped block moving positioning mechanism to change the inclination angle of the upper supporting block, so that the upper supporting block can be surface fitted and supported on the lower end surface of the kingpin hole. Different kingpin holes with different inclination angles of the lower end surface of the kingpin hole can also be surface fitted and supported on the upper supporting block for testing, thereby reducing the damage to the lower end surface of the kingpin hole during testing and affecting the use of the axle. The fifth utility model is realized.

[0022] As preferred, one end of the wedge-shaped block is thick and the other end is thin towards the upper supporting seat, the upper supporting block is surface contacted and supported on the upper end surface of the wedge-shaped block, the wedge-shaped block moving positioning mechanism comprises an adjusting bolt screwed on the upper supporting seat and a push block connected to the adjusting bolt and abutting against the end surface of the wedge-shaped block towards the upper supporting seat, and the push block is surface contacted and abutted against the wedge-shaped block. In use, the wedge-shaped block is moved by rotating the adjusting bolt, and the wedge-shaped block can be positioned after adjustment.

[0023] As preferred, the contact surface of the push block and the wedge-shaped block is parallel to the hinge shaft. The inclination movement of the wedge-shaped block during adjustment can be avoided, and the reliability during adjustment is improved.

[0024] As preferred, the connecting pin is clearance fitted with the kingpin hole. The assembly and disassembly are convenient.

[0025] As preferred, the top tight bolt is further screwed on the upper supporting seat to abut against the hole wall of the kingpin hole. While ensuring the convenience of assembly and disassembly, the displacement between the connecting pin and the axle during testing is avoided to cause the wear of the kingpin hole. In use, the axle and the connecting pin are separated to the limit position, and then the top tight bolt is tightened. The relative movement between the connecting pin and the axle frame is effectively avoided.

[0026] As preferred, the center lines of the top tight bolt and the connecting pin are located on the same vertical plane. The effect is good during tightening.

[0027] As preferred, the upper supporting seat comprises an upper supporting seat part bottom plate, two upper supporting seat part vertical plates connected to the upper supporting seat part bottom plate at the lower end, and an upper supporting seat part connecting block connecting the two upper supporting seat part vertical plates together, and the top tight bolt passes through the upper supporting seat part connecting block and the two upper supporting seat part vertical plates at the same time. The material is saved, the structural strength is good, and the weight is light

[0028] Preferably, a blocking plate fixing block is provided on one side of one upper support seat upright plate facing the other upper support seat upright plate. The blocking plate is fixed to the upper end of the upper support seat by blocking plate connecting bolts that pass through the blocking plate from top to bottom and are threadedly connected to the blocking plate fixing block. This makes fixing the blocking plate convenient and safe.

[0029] Preferably, the blocking plate connecting bolt passes through the blocking plate fixing block, and the blocking plate fixing thread is threadedly connected to a blocking plate fixing nut located below the blocking plate fixing block, thereby preventing the blocking plate connecting bolt from loosening.

[0030] As a preferred embodiment, the invention further comprises a blocking plate resistance bolt which is threadedly connected to the upper support seat and blocks the end of the blocking plate away from the connecting pin, thereby reducing the stress on the blocking plate connecting bolt and improving the reliability of the blocking plate when being fixed.

[0031] Preferably, the pressing frame is provided with a pulse head limiting hole, and the pulse head is inserted into the pulse head limiting hole and pressed on the pressing frame, so as to avoid the pulse head being misaligned with the middle of the vehicle axle and improve the reliability during the test.

[0032] Preferably, the pressing frame is connected to a pulse head limiting plate, and the pulse head limiting hole is arranged on the pulse head limiting plate, which is convenient for arranging the pulse head limiting hole and can be easily replaced when the pulse head limiting hole is damaged.

[0033] Preferably, the pulse head limit plate is detachably connected to the pressing frame, which is convenient for replacement.

[0034] The beneficial effects of the present invention are as follows: when testing different axles, the connection position between the pulse head and the axle is consistent; it is convenient to connect and disassemble the axle; the damage to the axle is small; the equipment is not easily damaged; the position can be fine-tuned so that the axle can be assembled even if there is a manufacturing error; the positional relationship between the connection point between the axle and the equipment and the equipment support point during testing is consistent with the connection relationship between the axle and the wheel when the axle is in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the present utility model;

[0036] Figure 2 for Figure 1 A local enlarged schematic diagram of point A;

[0037] Figure 3 for Figure 2 A local enlarged schematic diagram of point B;

[0038] Figure 4 for Figure 1a local enlarged schematic view at C of Fig.

[0039] Figure 5 a schematic view of the fixing seat;

[0040] Figure 6 a Figure 5 a local enlarged schematic view at D of Fig.

[0041] Figure 7 a Figure 5 a local enlarged schematic view at E of Fig.

[0042] In the figure: axle 1, pulse head 2, fixing seat 3, base 4, lock catch 5, connecting ear connecting bolt 6, base part locking bolt 7, connecting pin 10, lower support seat 11, rotating shaft 12, upper support seat 13, rotating sleeve 14, reinforcing strip 15, rotating shaft connecting ear 16, limiting ear 17, reinforcing strip part locking bolt 18, reinforcing strip part locking nut 19, reinforcing strip part groove widening part 20, upper support seat part locking bolt 21, limiting fork 22, vertical spring 23, fork head 24, upper shaft head 25, lower shaft head 26, supporting plate 27, long strip hole 28, supporting plate locking bolt 29, horizontal first shaft head 30, transverse spring 31, horizontal second shaft head 32, vertical support plate 33, adjusting screw 34, fixing nut 35, adjusting nut 36, upper holding block 37, upper fixing sleeve 38, blocking plate 80, limiting hole 39, hinge shaft 40, lower holding block 41, wedge-shaped block 42, adjusting bolt 43, push block 44, jacking bolt 45, upper support seat part bottom plate 46, upper support seat part vertical plate 47, upper support seat part connecting block 48, blocking plate fixing block 49, blocking plate connecting bolt 50, blocking plate fixing nut 51, blocking plate resistance bolt 52, pressing frame 53, support position 54, support foot 55, support foot lower section 56, support foot upper section 57, weight reduction groove 58, limiting ear 59, support foot fixing bolt 60, support roller 61, avoidance gap 62, recess 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, ground 77, king pin hole 81. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] Referring to Figures 1 to 7The application discloses a vehicle axle fatigue test device with a stress point consistent with an actual stress point, which comprises a vehicle axle fixing frame and a pulse head 2 for repeatedly pressing a vehicle axle 1 fixed by the vehicle axle fixing frame.

[0045] The lock catch is connected to the base through a base part locking bolt 7.

[0046] The pressing frame 53 is provided with two support positions 54 for supporting the vehicle axle, and two support feet 55 are arranged on the pressing frame and correspondingly support the two support positions. The pulse head is pressed on the pressing frame. The support feet comprise a support foot lower section 56 and a support foot upper section 57. The support foot lower section is supported on the support position, the support foot upper section is movably supported on the support foot lower section, and the support foot upper section is connected to the pressing frame. The vehicle axle is provided with weight reduction grooves 58 on the front and rear sides, and the support foot lower section is connected to two limiting ears 59 which protrude downward from the support foot lower section through a connecting ear connecting bolt 6. The vehicle axle is arranged between the two limiting ears, and the limiting ears are connected to support foot fixing bolts 60 which are tightly arranged in the weight reduction grooves. The support foot upper section is supported on the support foot lower section through a support roller 61, the support roller is parallel to the rotating shaft, and a clearance 62 is arranged between the support foot upper section and the support foot lower section. A groove 63 is arranged on the upper end surface of the support foot lower section, and the support roller is arranged in the groove. Two limiting rods 64 are threadedly connected to the support foot lower section and are located on the two sides of the support roller in the radial direction. A roller limiting block 65 is rotatably connected to the end of the limiting rod which faces the support roller, and the lower end of the roller limiting block abuts against the bottom surface of the groove and the upper end protrudes beyond the axis of the support roller. The limiting rod is threadedly connected to a limiting rod connecting nut 66 which is fixed to the support foot lower section. The roller limiting block is provided with a limiting rod connecting hole, the inner end of the limiting rod connecting hole is provided with a large diameter section, and a connecting hook head 67 is connected to the large diameter section for hooking the overlapping section. The pressing frame is provided with a pulse head limiting hole 68, and the pulse head is arranged in the pulse head limiting hole to press on the pressing frame. The pressing frame is connected to a pulse head limiting plate 69, and the pulse head limiting hole is arranged on the pulse head limiting plate. The pulse head limiting plate is detachably connected to the pressing frame through a limiting plate connecting bolt 70.

[0047] The lock includes a connecting pin 10 for being inserted into the king pin hole 81 of the axle, a lower support base 11 connected to the base through the lock fixing structure, an upper support base 13 supported on the lower support base through the rotating shaft 12, and a connecting pin fixing structure provided on the upper base for fixing the connecting pin, the axis of the connecting pin crosses the axis of the rotating shaft, the rotating shaft is perpendicular to the distribution direction of the base, and the rotating shaft is fixed with the upper support base. A rotating sleeve 14 is sleeved on the rotating shaft, and the rotating shaft is supported on the lower support base through the rotating sleeve. The upper support base is a flat plate structure, and the lower surfaces of the two ends of the upper support base in the extension direction of the rotating shaft are connected with the reinforcing bars 15 perpendicular to the rotating shaft. The lower surfaces of the reinforcing bars are connected with the rotating shaft connecting ears 16, and the rotating shaft is inserted and fixed on the rotating shaft connecting ears. The rotating shaft connecting ears are connected with the reinforcing bars through the detachable connecting structure, and the detachable connecting structure includes the reinforcing bar part grooves provided on the lower surfaces of the reinforcing bars and extending in the extension direction of the reinforcing bars, the reinforcing bar part locking bolts 18 inserted into the upper support base with the threaded ends downward, and the reinforcing bar part locking nuts 19 connected to the reinforcing bar part locking bolts. The upper ends of the reinforcing bar part grooves are provided with the reinforcing bar part groove widening parts 20, and the reinforcing bar part locking nuts are inserted into the reinforcing bar part groove widening parts. The reinforcing bars are fixed with the upper support base by being threadedly connected to the reinforcing bars through the upper support base part locking bolts 21 passing through the upper support base. The two ends of the rotating shaft are supported on one limiting fork 22, and the limiting fork is adjustably connected to the lower support base in the direction perpendicular to the rotating shaft. In use, the position of the rotating shaft is adjusted to realize the fine adjustment of the position of the upper support base to meet the connection of the axle fatigue test device to the axle with errors. The limiting fork includes the vertical spring 23, the fork head 24, the upper shaft head 25 connected with the fork head and inserted into the vertical spring, the lower shaft head 26 inserted into the lower end of the vertical spring, and the supporting plate 27 connected to the lower end of the lower shaft head. The supporting plate is provided with the long hole 28 extending in the direction perpendicular to the rotating shaft, and the supporting plate is fixed on the lower support base through the supporting plate locking bolt 29 inserted into the long hole. The fork head is connected with the horizontal first shaft head 30, the horizontal first shaft head is inserted into one end of the horizontal spring 31, the other end of the horizontal spring is sleeved on the horizontal second shaft head 32, the horizontal second shaft head is connected with the vertical support plate 33 abutting with the horizontal spring, the vertical support plate is connected with the adjusting screw 34 inserted into the limiting ear 17 of the lower support base, the adjusting screw is threadedly connected with the two fixing nuts 35 clamping the limiting ear, and the extension direction of the adjusting screw is the same as the extension direction of the long hole. Two-dimensional damping can be realized, the vibration during the test is reduced, and the rigidity of the horizontal spring can be changed by adjusting the position of the fixing nut to adapt to the damping effect during the test of different impact forces. The upper shaft head or the lower shaft head (the upper shaft head in this embodiment) is threadedly connected with the adjusting nut 36 abutting with the vertical spring.The connecting pin fixing structure comprises an upper supporting block 37 supporting the lower end of the connecting pin, an upper fixing sleeve 38 sleeving the upper end of the connecting pin, and a blocking plate 80 movably connected to the upper supporting seat and covering the upper end of the connecting pin to prevent the connecting pin from being pulled 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 39 sleeving the lower end of the connecting pin to limit the connecting pin, the upper supporting block is hinged to the upper supporting seat through a hinge shaft 40 which is parallel to the rotating shaft, the lower end of the upper supporting block is fixedly connected to a lower supporting block 41, the upper supporting block is supported on the lower supporting block through a wedge-shaped block 42 which is connected to the upper supporting seat through a wedge-shaped block moving positioning mechanism. The end of the wedge-shaped block facing the upper supporting seat is thick, and the other end is thin. The upper supporting block is in surface contact with the upper end surface of the wedge-shaped block. The wedge-shaped block moving positioning mechanism comprises an adjusting bolt 43 screwed to the upper supporting seat and a push block 44 connected to the adjusting bolt and abutting against the end surface of the wedge-shaped block facing the upper supporting seat. The push block is in surface contact with the wedge-shaped block. The contact surfaces of the push block and the wedge-shaped block are parallel to the hinge shaft. The connecting pin is in clearance fit with the main pin hole. The structure further comprises a tightening bolt 45 screwed to the upper supporting seat and abutting against the hole wall of the connecting pin and the main pin hole. The center lines of the tightening bolt and the connecting pin are located in the same vertical plane. The upper supporting seat comprises an upper supporting seat part bottom plate 46, two upper supporting seat part standing plates 47 connected to the upper supporting seat part bottom plate at the lower end, and an upper supporting seat part connecting block 48 connecting the two upper supporting seat part standing plates together. The tightening bolt passes through the upper supporting seat part connecting block and the two upper supporting seat part standing plates. The side of one upper supporting seat part standing plate facing the other upper supporting seat part standing plate is provided with a blocking plate fixing block 49. The blocking plate is fixed to the upper end of the upper supporting seat through a blocking plate connecting bolt 50 passing through the blocking plate from top to bottom and screwed to the blocking plate fixing block. The blocking plate connecting bolt penetrates the blocking plate fixing block. The blocking plate fixing block is screwed with a blocking plate fixing nut 51 located below the blocking plate fixing block. The structure further comprises a blocking plate resistance bolt 52 screwed to the upper supporting seat and blocking the end of the blocking plate away from the connecting pin.

Claims

1. A vehicle axle fatigue test device with a force point consistent with an actual force point, 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 comprises two fixing seats for fixing two ends of the axle one by one, the fixing seat comprises a base and a lock buckle connected to the base, the lock buckle is used for connecting with the end of the axle to fix the axle, the axle is provided with two support positions for supporting the support frame, the pressing frame is provided with two support feet which support the two support positions one by one, and the pulse head is pressed on the pressing frame.

2. The axle fatigue test device of claim 1, wherein The support foot comprises a lower support foot and an upper support foot, the lower support foot supports the support position, and the upper support foot is movably supported on the lower support foot, and the upper support foot is connected with the pressing frame.

3. The axle fatigue test apparatus of claim 2, wherein The axle is provided with a weight reduction groove on the front and rear sides, the lower support foot is provided with two limiting ears which protrude downward beyond the lower support foot, the axle is arranged between the two limiting ears, and the limiting ear is connected with a support foot fixing bolt which is tightly arranged in the weight reduction groove.

4. The axle fatigue test apparatus of claim 2 or 3, wherein The upper support foot is supported on the lower support foot through a support roller, the support roller is parallel to the rotating shaft, and a clearance is arranged between the upper support foot and the lower support foot.

5. The axle fatigue test apparatus of claim 4, wherein The upper end surface of the lower support foot is provided with a groove, and the support roller is located in the groove.

6. The axle fatigue test apparatus of claim 4, wherein Two limiting rods are threadedly connected to the lower support foot and located on the two sides of the support roller in the radial direction, one end of the limiting rod which faces the support roller is rotatably connected with a roller limiting block, the lower end of the roller limiting block abuts against the bottom surface of the groove, and the upper end protrudes beyond the axis of the support roller.

7. The axle fatigue test apparatus of claim 6, wherein The limiting rod is threadedly connected to a limiting rod connecting nut, and the limiting rod connecting nut is fixedly connected to the lower support foot.

8. The axle fatigue test apparatus of claim 6, wherein The roller limiting block is provided with a limiting rod connecting hole, the inner end of the limiting rod connecting hole is provided with a large diameter section, and the limiting rod is connected with a connecting hook head which is located in the large diameter section and used for hooking the lap joint section.

9. The axle fatigue test apparatus of claim 1, wherein The lock buckle comprises a connecting pin used for penetrating into the kingpin hole of the axle, a lower support base connected to the base through a lock buckle fixing structure, an upper support base supported on the lower support base through a rotating shaft, and a connecting pin fixing structure arranged on the upper base and used for fixing the connecting pin, the axis of the connecting pin intersects with the axis of the rotating shaft, the rotating shaft is perpendicular to the distribution direction of the base, and the rotating shaft is fixed with the upper support base.

10. The axle fatigue test apparatus of claim 9, wherein The both ends of the rotating shaft are supported on a limiting fork, the limiting fork is adjustably connected on the lower supporting base along the direction perpendicular to the rotating shaft, the limiting fork comprises a vertical spring, a fork head, an upper shaft head connected with the fork head and arranged in the vertical spring, a lower shaft head arranged in the lower end of the vertical spring and a supporting plate connected on the lower end of the lower shaft head, the supporting plate is provided with a long hole extending along the direction perpendicular to the rotating shaft, the supporting plate is fixed on the lower supporting base through the supporting plate locking bolt arranged in the long hole, the fork head is connected with a horizontal first shaft head, the horizontal first shaft head is arranged in one end of a horizontal spring, the other end of the horizontal spring is sleeved on a horizontal second shaft head, the horizontal second shaft head is connected with a vertical supporting plate abutting with the horizontal spring, the vertical supporting plate is connected with an adjusting screw rod arranged on the limiting ear of the lower supporting base, the adjusting screw rod is threadedly connected with two fixed nuts clamping the limiting ear, the extending direction of the adjusting screw rod is same with the extending direction of the long hole, the upper shaft head or the lower shaft head is threadedly connected with an adjusting nut abutting with the vertical spring.

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