Axle fatigue test device with stress point located at tire stress point during detection

Abstract

The axle fatigue test device comprises an axle fixing frame and a pulse head, and is characterized in that each fixing seat comprises a base and a lock catch connected to the base, the base extends in the distribution direction of the two fixing seats, and the pulse head is arranged on the base. The lock catch comprises a connecting pin, a lower supporting seat, an upper supporting seat and a connecting pin fixing structure, wherein the connecting pin is arranged in a main pin hole of an axle in a penetrating mode, the lower supporting seat is connected to the base through the lock catch fixing structure, the upper supporting seat is supported on the lower supporting base through a rotating shaft, and the connecting pin fixing structure is 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 extending direction of the base, and the rotating shaft and the upper supporting base are fixed together. The axle fatigue test device has the advantage that the stress point is consistent with the stress point of the tire during detection, and solves the problem that the stress point is randomly set during detection of the existing axle fatigue test device, so that the difference of test data in actual use is large.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle axle production, and in particular to a vehicle axle fatigue testing device in which a stress point during testing is located at a tire stress point. Background Art

[0002] The axle is a component of a car, including an axle rod body and kingpin holes arranged at both ends of the axle rod body. The kingpin holes are inclined holes and the lower end faces are inclined faces. There are two support positions on the axle. When practical, the steel plate supporting the frame is supported on the support positions, so that the frame is supported on the axle. In order to improve the effort saving during steering, it is best if the intersection of the axis of the kingpin hole and the ground is located on the boundary line between the center plane of the wheel and the ground. In order to ensure the quality of the axle, the axle needs to be fatigue tested before leaving the factory, and only those that meet the protection requirements can leave the factory. The fatigue test is completed by a fatigue test device. An existing axle fatigue test device is disclosed in the patent document of Chinese Patent No. 2021107853467. The existing axle fatigue test device has the following shortcomings: poor versatility and cannot meet the testing needs of axles of different lengths; when the axle has a manufacturing error, it cannot be easily assembled; the pulse head is pressed on the middle of the axle to test the fatigue test, and the test result deviates greatly from the result in actual use; it is inconvenient to assemble and disassemble the axle; the force points of this device are different from the plane, and it is impossible to determine whether the ring groove is deformed during the test, and the device is easily damaged; the positional relationship between the connection point of the axle and the device and the force point of the device is inconsistent with the positional relationship between the force point of the wheel when the axle is used and the support point of the wheel, resulting in a large deviation between the detected result and the actual result; positional deviation is easily generated between the pulse head and the axle; and the axle is severely damaged during testing. Summary of the invention

[0003] The present invention aims to provide a vehicle bridge fatigue test device in which the stress points during detection are consistent with the tire stress points, thereby solving the problem that the stress points of the existing vehicle bridge fatigue test device are arbitrarily set during detection, resulting in large differences in test data during actual use.

[0004] The above technical problems are solved by the following technical solutions: an axle fatigue testing device in which the stress point is located at the tire stress point during detection, 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, the two fixing seats are used to fix the two ends of the axle in a one-to-one correspondence, the fixing seat comprises a base and a lock connected to the base, the lock is used to connect with the end of the axle to fix the axle, the lock comprises a connecting pin for passing through the main pin hole of the axle, a lower supporting seat connected to the base, an upper supporting seat supported on the lower supporting base by a rotating shaft, and a connecting pin fixing structure arranged on the upper base to fix 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 two bases, and the rotating shaft is fixed together with the upper supporting seat. When in use, the connecting pin is inserted into the main pin hole of the axle and fixed by the connecting pin fixing structure to prevent it from falling off. This structure can make the force effect of the axle during the test consistent with the force effect of the axle during actual use, so that the tested data is the data during actual use. The shaft support can provide space for the shaft to rotate when the axle is deformed by force, so that the axle fatigue test device is not easily damaged. The second invention purpose is achieved.

[0005] Preferably, a rotating sleeve is provided on the rotating shaft, and the rotating shaft is supported on the lower supporting base through the rotating sleeve, so as to reduce the wear of the rotating shaft when it rotates back and forth during the test process, and further play a role in extending the service life of the vehicle axle fatigue test device.

[0006] Preferably, the upper support seat is a flat plate structure, and the lower surfaces of both ends of the upper support seat along the extension direction of the shaft are connected with reinforcing strips perpendicular to the shaft, and the lower surfaces of the reinforcing strips are connected with shaft connecting ears, and the shaft is passed through and fixed on the shaft connecting ears. When the upper support seat is a thin plate structure, it is not easy to be damaged during use.

[0007] Preferably, the shaft connecting ear is connected to the reinforcing strip through a detachable connecting structure, the detachable connecting structure comprises a reinforcing strip groove provided on the lower surface of the reinforcing strip and extending in the extending direction of the reinforcing strip, a reinforcing strip locking bolt with a threaded end downwardly penetrating the upper support seat, and a reinforcing strip locking nut connected to the reinforcing strip locking bolt, the upper end of the reinforcing strip groove is provided with a reinforcing strip groove widening portion, and the reinforcing strip locking nut is penetrated in the reinforcing strip groove widening portion. The position of the shaft can be conveniently adjusted until the axis of the connecting pin intersects with the axis of the shaft, which improves the convenience during manufacturing.

[0008] Preferably, the reinforcing bar is threadedly connected to the reinforcing bar through the upper support seat through the locking bolt of the upper support seat, and is fixed together with the upper support seat, so that the connection is convenient.

[0009] Preferably, the two ends of the rotating shaft are supported on a limit fork, and the limit fork is adjustably connected to the lower support seat along the direction perpendicular to the rotating shaft. When in use, the position of the rotating shaft is changed by adjusting the position of the limit fork to achieve fine adjustment of the position of the upper support seat to meet the requirement that the axle can be conveniently connected to the axle fatigue test device when there is an error in the axle. The third invention purpose is achieved.

[0010] Preferably, the limit fork comprises a vertical spring that is telescopic in vertical direction, a fork head, an upper shaft head connected with the fork head at the upper end and inserted in the vertical spring, a lower shaft head inserted in the lower end of the vertical spring, and a support plate connected to the lower end of the lower shaft head, the support plate is provided with a long hole extending in a direction perpendicular to the rotating shaft, the support plate is fixed to the lower support seat by a support plate locking bolt inserted in the long hole, the fork head is connected with a horizontal first shaft head, the horizontal first shaft head is inserted in one end of the transverse spring that is telescopic in horizontal direction, the other end of the transverse spring is sleeved on the horizontal second shaft head, the horizontal shaft head is connected with a vertical support plate that is abutted with the transverse spring, the vertical support plate is connected with an adjusting screw on the limit ear inserted in the lower support seat, the adjusting screw is threadedly connected with two fixing nuts that clamp the limit ear, and the extending direction of the adjusting screw is the same as the extending direction of the long hole. It can perform two-dimensional shock absorption and reduce vibration during the test. At the same time, the stiffness of the transverse spring can be changed by adjusting the position of the fixing nut to adapt to the shock absorption effect during the test of different impact forces.

[0011] Preferably, an adjusting nut abutting against the vertical spring is threadedly connected to the upper shaft head or the lower shaft head, so that the stiffness of the vertical spring can be adjusted to change the shock absorbing effect.

[0012] Preferably, the connecting pin fixing structure includes an upper supporting block supported on the lower end of the connecting pin, an upper fixing sleeve sleeved on the upper end of the connecting pin, and a blocking plate movably connected to the upper support seat to block the upper end of the connecting pin to prevent the connecting pin from slipping out upward. When in use, the end of the axle is passed between the upper supporting block and the upper fixing sleeve, and the connecting pin passes through the upper fixing sleeve and the kingpin hole in turn and is supported on the upper supporting block, and then the blocking plate blocks the upper end of the upper connecting pin to prevent it from slipping out. The actual fixing method of the axle is convenient and simulated during fixing, so that the data during testing is consistent with the data during actual use. The fourth invention purpose is achieved.

[0013] Preferably, the inner diameter of the upper fixing sleeve is larger than the diameter of the connecting pin, and 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 on the upper supporting seat through a hinge shaft, and the hinge shaft is parallel to the rotating shaft. The upper supporting seat is fixed with a lower supporting block, and the upper supporting block is supported on the lower supporting block through a wedge block, and the wedge block is connected to the upper supporting seat through a wedge block shifting and positioning mechanism. When in use, the wedge block is moved by the wedge block shifting and positioning mechanism to change the inclination angle of the upper supporting block, so that the upper support can be supported on the lower end face of the kingpin hole of the axle in a face-to-face manner. Axles with different inclination angles of the lower end faces of the kingpin holes can also be supported on the upper supporting block in a face-to-face manner for testing, thereby reducing damage to the lower end face of the kingpin hole during the test and affecting the use of the axle. The fifth purpose of the invention is achieved.

[0014] Preferably, the wedge block is thick at one end facing the upper support seat and thin at the other end, and the upper support block is supported on the upper end face of the wedge block in surface contact, and the wedge block shifting and positioning mechanism includes an adjusting bolt threadedly connected to the upper support seat and a push block connected to the adjusting bolt and abutting on the end face of the wedge block facing the upper support seat, and the push block abuts against the wedge block in surface contact. When in use, the wedge block is moved by rotating the adjusting bolt, and the wedge block can be positioned after being adjusted into place. The adjusting bolt can serve both positioning and adjustment functions.

[0015] Preferably, the contact surface between the push block and the wedge block is parallel to the hinge shaft, so as to avoid the skew movement when adjusting the wedge block and improve the reliability of the adjustment.

[0016] Preferably, the connecting pin and the main pin hole are clearance-fitted, which is convenient for assembly and disassembly.

[0017] Preferably, it also includes a tightening bolt threadedly connected to the upper support seat and tightened on the axle so that the connecting pin abuts against the hole wall of the kingpin hole. While ensuring the convenience of assembly and disassembly, it avoids the displacement between the connecting pin and the axle during testing and causes the kingpin hole to wear. When in use, first separate the axle and the connecting pin to the limit position, and then tighten with the tightening bolt. It can effectively produce relative movement between the wall connecting pin and the frame to model the kingpin hole.

[0018] Preferably, the center lines of the tightening bolt and the connecting pin are located on the same vertical plane, so that the tightening effect is good.

[0019] Preferably, the upper support seat comprises an upper support seat bottom plate, two upper support seat upright plates connected at the lower ends to the upper support seat bottom plate, and an upper support seat connecting block connecting the two upper support seat upright plates, and the tightening bolt passes through the upper support seat connecting block and the two upper support seat upright plates at the same time, thereby saving materials, having good structural strength, and being light in weight.

[0020] Preferably, a blocking plate fixing block is provided on one side of one upper support seat vertical plate facing the other upper support seat vertical plate, and the blocking plate is fixed to the upper end of the upper support seat by blocking plate connecting bolts passing through the blocking plate from top to bottom and being threadedly connected to the blocking plate fixing block. Fixing the blocking plate is convenient and safe.

[0021] Preferably, the blocking plate connecting bolts penetrate the blocking plate fixing block, and the blocking plate fixing threads are threadedly connected to the blocking plate fixing nuts located below the blocking plate fixing block, so as to prevent the blocking plate connecting bolts from loosening.

[0022] As a preferred embodiment, a blocking plate resistance bolt is also included, 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.

[0023] Preferably, it also includes a pressing frame, the axle is provided with two supporting positions for supporting the frame, the pressing frame is provided with two supporting feet, the two supporting feet support the two supporting positions one by one, and the pulse head is pressed on the pressing frame. The force point during the test can be the actual force point when the axle is in use, thereby improving the accuracy of the test data. The sixth invention purpose is achieved.

[0024] Preferably, the support foot comprises a lower section of the support foot and an upper section of the support foot, the lower section of the support foot is supported on the support position, the upper section of the support foot is movably supported on the lower section of the support foot, and the upper section of the support foot is connected to the pressing frame. This can prevent wear from occurring between the upper and lower sections of the support foot when the pressing frame is elastically deformed during the test, and will not cause wear to the support position of the vehicle axle, thereby avoiding damage to the vehicle axle caused by the test.

[0025] Preferably, the front and rear sides of the axle are provided with weight-reducing grooves, the lower section of the support foot is provided with two limiting ears extending downward beyond the lower section of the support foot, the axle is passed through the two limiting ears, and the limiting ears are connected with support foot fixing bolts tightened in the weight-reducing grooves, so that the lower section of the support foot can be reliably connected to the support position.

[0026] Preferably, the upper section of the support leg is supported on the lower section of the support leg by a support roller, the support roller is parallel to the rotation axis, and an avoidance gap is provided between the upper section of the support leg and the lower section of the support leg, so that the wear between the upper and lower sections of the support leg is reduced when the pressing frame is elastically deformed during the test.

[0027] Preferably, a groove is provided on the upper end surface of the lower section of the support foot, and the support roller is located in the groove, so as to ensure that the avoidance gap is short enough and avoid being too large to cause a large appearance.

[0028] Preferably, two limit rods located on both sides of the radial direction of the support roller are threadedly connected to the lower section of the support foot, and one end of the limit rod is rotatably connected to a roller limit block toward the support roller, and the lower end of the roller limit block abuts against the bottom surface of the groove and the upper end exceeds the axis of the support roller, so as to prevent the support roller from falling out and have a good compact structure.

[0029] Preferably, the limit rod is threadedly connected to the limit rod connecting nut, and the limit rod connecting nut is fixedly connected to the lower section of the support foot, so as to conveniently realize the threaded connection between the limit rod and the lower section of the support foot.

[0030] Preferably, the roller limit block is provided with a limit rod connection hole, the inner end of the limit rod connection hole is provided with a large diameter section, and the limit rod is connected with a connection hook head located in the large diameter section for hooking on the overlap section, so as to prevent the rotation of the plate connection bolt and drive the roller limit block to translate while keeping the roller limit block part rotating.

[0031] Preferably, it also includes a pressing frame, on which a pulse head limiting hole is provided, and the pulse head is inserted into the pulse head limiting hole and pressed on the pressing frame. This can prevent the pulse head from being misaligned with the middle of the axle, thereby improving the reliability during the test. The seventh invention objective is achieved.

[0032] Preferably, the pressing frame is connected with a pulse head limit plate, and the pulse head limit hole is arranged on the pulse head limit plate. It is convenient to arrange the pulse head limit hole, and the pulse head limit hole can be easily replaced when it is damaged.

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

[0034] Preferably, the base is supported on wheels, so that during the test, the environment in which the axle is supported is the same as that during actual use, that is, supported by the wheels.

[0035] Preferably, the axes of the wheels on the bases of the two fixing seats are staggered in the horizontal direction, so that only one row of wheels can be arranged on the base and the base can be stably supported without tipping over.

[0036] Preferably, the base is supported by two coaxially arranged wheels, and the vehicle bridge fatigue test device further comprises two brake rods, both ends of which are correspondingly arranged in the space surrounded by the wheel hubs of the two wheels, the rotating shaft of the wheel and the two brake rods are located in the same horizontal plane, the brake rods are abutted against the wheel hubs, the two brake rods are connected to the brake rod fixing block, the brake rod fixing block is connected to the upper end of the vertical rod, and the lower end of the vertical rod is fixed to the ground. The wheels can be braked conveniently to avoid rotational movement.

[0037] Preferably, a base installation pit is provided on the ground, and the wheels are supported in the base installation pit, so that the height can be reduced, making it more convenient to use.

[0038] The beneficial effects of the present invention are as follows: it can be applied to the detection of axles of different lengths; the connection position between the pulse head and the axle is consistent when detecting different axles; it is convenient to connect and remove 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 detection is consistent with the connection relationship between the axle and the wheel when the axle is in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the present invention Figure 2 for Figure 1 A local enlarged schematic diagram of point A; Figure 3 for Figure 2 A local enlarged schematic diagram of point B; Figure 4 for Figure 1 A local enlarged schematic diagram of point C; Figure 5 is a schematic diagram of a fixing seat; Figure 6 for Figure 5 A local enlarged schematic diagram of D; Figure 7 for Figure 5 A local enlarged schematic diagram of point E; Figure 8 is a schematic diagram of a fixing base in Embodiment 2; Fig. 9 for Figure 8 F-F cross-sectional diagram of .

[0040] In the figure: axle 1, pulse head 2, fixing seat 3, base 4, lock buckle 5, connecting ear connecting bolt 6, base 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 locking bolt 18, reinforcing strip locking nut 19, reinforcing strip groove widening part 20, upper support seat locking bolt 21, limiting fork 22, vertical spring 23, fork 24, upper shaft head 25, lower shaft head 26, support plate 27, long hole 28, support 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 supporting block 37, upper fixing sleeve 38, blocking plate 80, limiting hole 39, hinge shaft 40, lower supporting block 41, wedge block 42, Adjusting bolt 43, push block 44, tightening bolt 45, upper support seat bottom plate 46, upper support seat vertical plate 47, upper support seat 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, limit ear 59, support foot fixing bolt 6 0, supporting roller 61, avoidance gap 62, groove 63, limit rod 64, roller limit block 65, limit rod connecting nut 66, connecting hook head 67, pulse head limit hole 68, pulse head limit plate 69, limit plate connecting bolt 70, wheel 71, wheel hub 72, rubber tire 73, brake lever 74, brake lever fixing block 75, vertical pole 76, ground 77, base mounting pit 78, wheel shaft 79, kingpin hole 81. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Example 1, see Figures 1 to 7 , a vehicle bridge fatigue test device in which the stress point is located at the tire stress point during the test, comprising a vehicle bridge fixing frame and a pulse head 2 for repeatedly pressing a vehicle bridge 1 fixed by the vehicle bridge fixing frame. The vehicle bridge fixing frame comprises two fixing seats 3, and the two fixing seats are used to fix the two ends of the vehicle bridge in a one-to-one correspondence. The fixing seat comprises a base 4 and a lock 5 connected to the base, and the lock is used to connect with the end of the vehicle bridge to fix the vehicle bridge.

[0043] The lock catch is connected to the base via a base locking bolt 7.

[0044] The lock includes a connecting pin 10 for passing through the main pin hole 81 of the axle, a lower support seat 11 connected to the base through a lock fixing structure, an upper support seat 13 supported on the lower support base through a rotating shaft 12, and a connecting pin fixing structure for fixing the connecting pin arranged on the upper base, wherein 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 together with the upper support seat. 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 seat is a flat plate structure, and the lower surfaces of the two ends of the upper support seat along the extension direction of the rotating shaft are connected with reinforcing strips 15 perpendicular to the rotating shaft, and the lower surfaces of the reinforcing strips are connected with rotating shaft connecting ears 16, and the rotating shaft is passed through and fixed on the rotating shaft connecting ears. The shaft connecting ear is connected with the reinforcing strip through a detachable connecting structure, which includes a reinforcing strip groove provided on the lower surface of the reinforcing strip and extending in the extending direction of the reinforcing strip, a reinforcing strip locking bolt 18 with a threaded end downwardly penetrating the upper support seat, and a reinforcing strip locking nut 19 connected to the reinforcing strip locking bolt. The upper end of the reinforcing strip groove is provided with a reinforcing strip groove widening portion 20, and the reinforcing strip locking nut is penetrating the reinforcing strip groove widening portion. The reinforcing strip is threadedly connected to the reinforcing strip after passing through the upper support seat through the upper support seat locking bolt 21 and fixed together with the upper support seat. The two ends of the rotating shaft are each supported on a limit fork 22, and the limit fork is adjustably connected to the lower support seat along the direction perpendicular to the rotating shaft. When in use, the position of the rotating shaft is changed by adjusting the position of the limit fork to achieve fine adjustment of the position of the upper support seat to meet the requirements of convenient connection to the axle fatigue test device when there is an error in the axle. The limiting fork comprises a vertical spring 23 for vertical extension, a fork head 24, an upper shaft head 25 connected to the fork head at the upper end and inserted in the vertical spring, a lower shaft head 26 inserted in 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 is provided with an elongated hole 28 extending in a direction perpendicular to the rotating shaft. The support plate is fixed to the lower support seat by a support plate locking bolt 29 inserted in the elongated hole. A horizontal first shaft head 30 is connected to the fork head. The horizontal first shaft head is inserted in one end of a transverse spring 31 for transverse extension. The other end of the transverse spring is sleeved on a horizontal second shaft head 32. A vertical supporting plate 33 abutting against the transverse spring is connected to the horizontal second shaft head. The vertical supporting plate is connected to an adjusting screw 34 on the limiting ear 17 inserted in the lower support seat. Two fixing nuts 35 for clamping the limiting ear are threadedly connected to the adjusting screw. The extending direction of the adjusting screw is the same as that of the elongated hole. It can perform two-dimensional shock absorption to reduce vibration during the test, and at the same time, the stiffness of the transverse spring can be changed by adjusting the position of the fixing nut to adapt to the shock absorption effect during different impact tests. The upper shaft head or the lower shaft head (the upper shaft head in this embodiment) is threadedly connected with an adjusting nut 36 that abuts against the vertical spring.The connecting pin fixing structure includes an upper supporting block 37 supported on 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 to prevent the connecting pin from slipping upward. The inner diameter of the upper fixing sleeve is larger than the diameter of the connecting pin, and 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 through a hinge shaft 40, and the hinge shaft is parallel to the rotating shaft. A lower supporting block 41 is fixed to the upper support seat, and the upper supporting block is supported on the lower supporting block through a wedge block 42, and the wedge block is connected to the upper support seat through a wedge block shifting and positioning mechanism. The wedge block is thick at one end facing the upper support seat and thin at the other end. The upper support block is supported on the upper end surface of the wedge block in surface contact. The wedge block displacement positioning mechanism includes an adjustment bolt 43 threadedly connected to the upper support seat and a push block 44 connected to the adjustment bolt and abutting on the end surface of the wedge block facing the upper support seat. The push block and the wedge block are in surface contact and abut together. The contact surfaces of the push block and the wedge block are parallel to the hinge axis. The connecting pin and the kingpin hole are clearance-fitted. It also includes a tightening bolt 45 threadedly connected to the upper support seat and tightened on the axle so that the connecting pin abuts against the hole wall of the kingpin hole. The center lines of the tightening bolt and the connecting pin are located on the same vertical plane. The upper support seat includes an upper support seat bottom plate 46, two upper support seat vertical plates 47 connected to the upper support seat bottom plate at the lower end, and an upper support seat connecting block 48 connecting the two upper support seat vertical plates together, and the tightening bolts pass through the upper support seat connecting block and the two upper support seat vertical plates at the same time. A blocking plate fixing block 49 is provided on one side of an upper support seat vertical plate facing the other upper support seat vertical plate, and the blocking plate is fixed to the upper end of the upper support seat by a blocking plate connecting bolt 50 that passes through the blocking plate from top to bottom and is threadedly connected to the blocking plate fixing block. 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 51 located below the blocking plate fixing block. It also includes a blocking plate resistance bolt 52 that is threadedly connected to the upper support seat and is blocked at one end of the blocking plate away from the connecting pin. It also includes a pressing frame 53, the axle is provided with two supporting positions 54 for supporting the frame, and the pressing frame is provided with two supporting feet 55, the two supporting feet support the two supporting positions one by one, and the pulse head is pressed on the pressing frame. The supporting foot includes a supporting foot lower section 56 and a supporting foot upper section 57, the supporting foot lower section is supported on the supporting position, the supporting foot upper section can be movably supported on the supporting foot lower section, and the supporting foot upper section is connected to the pressing frame. A weight reduction groove 58 is provided on the front and rear sides of the axle, and the supporting foot lower section is connected to two limiting ears 59 that extend downward beyond the supporting foot lower section through a connecting ear connecting bolt 6, the axle is inserted between the two limiting ears, and the limiting ear is connected with a supporting foot fixing bolt 60 that is tightened in the weight reduction groove. The supporting foot upper section is supported on the supporting foot lower section through a supporting roller 61, and the supporting roller is parallel to the rotating shaft, and an avoidance gap 62 is provided between the supporting foot upper section and the supporting foot lower section.A groove 63 is provided on the upper end surface of the lower section of the support foot, and the support roller is located in the groove. Two limit rods 64 located on both sides of the radial direction of the support roller are threadedly connected to the lower section of the support foot. The limit rod is rotatably connected to a roller limit block 65 toward one end of the support roller. The lower end of the roller limit block abuts against the bottom surface of the groove, and the upper end exceeds the axis of the support roller. The limit rod is threadedly connected to a limit rod connecting nut 66, and the limit rod connecting nut is fixed to the lower section of the support foot. The roller limit block is provided with a limit rod connecting hole, and a large diameter section is provided at the inner end of the limit rod connecting hole. The limit rod is connected to a connecting hook head 67 located in the large diameter section for hooking on the overlapping section. A pulse head limit hole 68 is provided on the pressing frame, and the pulse head is inserted into the pulse head limit hole and pressed on the pressing frame. A pulse head limit plate 69 is connected to the pressing frame, and the pulse head limit hole is provided on the pulse head limit plate. The pulse head limit plate is detachably connected to the pressing frame, specifically, they are connected together through the limit plate connecting bolts 70 .

[0045] Embodiment 2 is different from Embodiment 1 in that: See also Figure 8 and 9 , the base is supported on the wheel 71. The base on a fixed seat is provided with two coaxially arranged wheels, and the axes of the wheels on the bases of the two fixed seats are staggered in the horizontal direction. The wheel includes a wheel hub 72 and a rubber tire 73 wrapped around the wheel hub. The axle fatigue test device also includes two brake rods 74 with two ends correspondingly inserted in the space surrounded by the wheel hubs of the two wheels, the rotating shaft 79 of the wheel and the two brake rods are located in the same horizontal plane, the brake rods are abutted against the inner circumference of the wheel hub, and the two brake rods are connected to the brake rod fixing block 75, the brake rod fixing block is connected to the upper end of the vertical rod 76, and the lower end of the vertical rod is fixed to the ground. A base mounting pit 78 is provided on the ground 77, and the wheel is supported in the base mounting pit.

Claims

1. A vehicle axle fatigue test device in which the stress point during testing is located at the tire stress point, 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 axle fixing frame includes two fixing seats, and the two fixing seats are used to fix the two ends of the axle in a one-to-one correspondence. The fixing seat includes a base and a lock connected to the base, and the lock is used to connect with the end of the axle to fix the axle. The lock includes a connecting pin for passing through the main pin hole of the axle, a lower supporting seat connected to the base, an upper supporting seat supported on the lower supporting base by a rotating shaft, and a connecting pin fixing structure provided on the upper base to fix 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 two bases, and the rotating shaft is fixed together with the upper supporting seat.

2. The vehicle axle fatigue testing device according to claim 1, wherein the stress point during testing is located at the tire stress point, characterized in that: A rotating sleeve is sleeved on the rotating shaft, and the rotating shaft is supported on a lower supporting base through the rotating sleeve.

3. The vehicle axle fatigue testing device according to claim 1 or 2, wherein the stress point during testing is located at the tire stress point, characterized in that: The upper support seat is a flat plate structure, and the lower surfaces of the two ends of the upper support seat along the extension direction of the shaft are connected with reinforcement strips perpendicular to the rotating shaft, and the lower surface of the reinforcement strip is connected with a rotating shaft connecting ear, and the rotating shaft is passed through and fixed on the rotating shaft connecting ear, and the rotating shaft connecting ear is connected to the reinforcement strip through a detachable connecting structure. The detachable connecting structure includes a reinforcement strip groove arranged on the lower surface of the reinforcement strip and extending along the extension direction of the reinforcement strip, a reinforcement strip locking bolt with a threaded end facing downward and passed through the upper support seat, and a reinforcement strip locking nut connected to the reinforcement strip locking bolt, the upper end of the reinforcement strip groove is provided with a reinforcement strip groove widening portion, and the reinforcement strip locking nut is passed through the reinforcement strip groove widening portion.

4. The vehicle axle fatigue testing device according to claim 1 or 2, wherein the stress point during testing is located at the stress point of the tire, Both ends of the rotating shaft are supported on a limiting fork respectively, and the limiting fork is adjustably connected to the lower supporting seat along a direction perpendicular to the rotating shaft.

5. The vehicle axle fatigue testing device according to claim 4, wherein the stress point during testing is located at the tire stress point, characterized in that: The limit fork comprises a vertical spring that is telescopic in vertical direction, a fork head, an upper shaft head connected with the fork head at the upper end and inserted in the vertical spring, a lower shaft head inserted in the lower end of the vertical spring, and a support plate connected to the lower end of the lower shaft head, the support plate is provided with a long hole extending in a direction perpendicular to the rotating shaft, the support plate is fixed to the lower support seat by a support plate locking bolt inserted in the long hole, the fork head is connected with a horizontal first shaft head, the horizontal first shaft head is inserted in one end of the transverse spring that is telescopic in horizontal direction, the other end of the transverse spring is sleeved on a horizontal second shaft head, the horizontal second shaft head is connected with a vertical support plate that is abutted with the transverse spring, the vertical support plate is connected with an adjusting screw on a limit ear inserted in the lower support seat, the adjusting screw is threadedly connected with two fixing nuts that clamp the limit ear, the extending direction of the adjusting screw is the same as the extending direction of the long hole, and the upper shaft head or the lower shaft head is threadedly connected with an adjusting nut that is abutted with the vertical spring. The stiffness of the vertical spring can be adjusted to change the shock absorption effect.

6. The vehicle axle fatigue testing device according to claim 1 or 2, wherein the stress point during testing is located at the tire stress point, characterized in that: The connecting pin fixing structure comprises an upper supporting block supported on the lower end of the connecting pin, an upper fixing sleeve sleeved on the upper end of the connecting pin and a blocking plate movably connected to the upper supporting seat to cover the upper end of the connecting pin to prevent the connecting pin from slipping upward.

7. The vehicle axle fatigue testing device according to claim 6, wherein the stress point during testing is located at the tire stress point, characterized in that: 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 which is 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, and the hinge shaft is parallel to the rotating shaft. A lower supporting block is fixedly connected to the upper supporting seat. The upper supporting block is supported on the lower supporting block through a wedge block, and the wedge block is connected to the upper supporting seat through a wedge block shifting and positioning mechanism.

8. The vehicle axle fatigue testing device according to claim 7, wherein the stress point during testing is located at the stress point of the tire, The wedge block is thick at one end facing the upper support seat and thin at the other end. The upper supporting block is supported on the upper end surface of the wedge block in surface contact. The wedge block shifting and positioning mechanism includes an adjusting bolt threadedly connected to the upper support seat and a pushing block connected to the adjusting bolt and abutting on the end surface of the wedge block facing the upper support seat. The pushing block abuts against the wedge block in surface contact with the wedge block.

9. The vehicle axle fatigue testing device according to claim 1 or 2, wherein the stress point during testing is located at the tire stress point, characterized in that: The base is supported on wheels.

10. The vehicle axle fatigue testing device according to claim 9, wherein the stress point during testing is located at the stress point of the tire, The axes of the wheels on the bases of the two fixing seats are staggered in the horizontal direction.

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