Fatigue testing device for flange shaft of new energy automobile

Abstract

The invention relates to the technical field of automobile part testing, and discloses a fatigue testing device for a flange shaft of a new energy automobile, which comprises a flange fixing block, a stress application rod, an actuator pressure head and a welding defect detection unit, and is characterized in that the flange fixing block is mounted on a test board, and a flange shaft test piece is mounted on one side of the flange fixing block; the shaft body section of the flange shaft test piece is polygonal; the stress application rod sleeves the flange shaft, one end of the stress application rod is provided with a polygonal through hole matched with the flange shaft, and the stress application rod is vertically or horizontally arranged; the actuator pressure head is movably arranged at the stress application end of the fatigue testing machine and is connected with the stress application rod; the welding defect detection unit is used for detecting changes of a welding area in the fatigue test. According to the invention, the force application point during the fatigue test can be changed, so that the device can carry out the fatigue test under the bending moment or torque working condition and adjust the torque without dismounting the pressure head of the actuator, the repositioning is not needed, the application range of the fatigue test is improved, and the integrated design of the test device is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile component testing, and more particularly to a fatigue testing device for a flange shaft of a new energy vehicle. Background Art

[0002] Flange shafts are widely used in new energy vehicles. They are key components for power transmission, wheel hub support, and system connectivity. During operation, the instantaneous torque output of the motor in new energy vehicles far exceeds that of fuel-powered vehicles. For example, during starting and acceleration, the torque can reach 2-3 times that of conventional vehicles. Flange shafts are subject to high-frequency alternating stresses, which can easily cause fatigue cracks at weak points.

[0003] Welded flange shafts often connect the flange to the shaft body through welding. However, the heat-affected zone, residual stress, and potential weld defects (such as lack of fusion, porosity, and slag inclusions) introduced during the welding process can adversely affect the fatigue performance of the welded joint, making it the weakest link in the entire flange shaft structure. Therefore, fatigue testing of flange shafts is required before new energy vehicles leave the factory to ensure vehicle safety.

[0004] However, existing flange shaft fatigue testing devices can only perform tests under a single operating condition, either bending moment or torque, and the torque application point cannot be adjusted. Testing under multiple operating conditions requires the flange shaft to be moved and repositioned. For example, Chinese patent publication number CN207528434U discloses a pressure test device for automotive flange shaft processing. This device requires movement between a torque tester and a pressurizing device during flange shaft testing.

[0005] Therefore, it is necessary to propose a fatigue testing device for a flange shaft of a new energy vehicle to at least partially solve the problems existing in the prior art. Summary of the Invention

[0006] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] To at least partially solve the above problems, the present invention provides a fatigue testing device for a flange shaft of a new energy vehicle, comprising:

[0008] A flange fixing block, a force rod, an actuator pressure head and a welding defect detection unit. The flange fixing block is installed on the test bench, the flange shaft specimen is installed on one side of the flange fixing block, and the shaft cross-section of the flange shaft specimen is set to a polygon; the force rod is sleeved on the flange shaft and one end is provided with a polygonal through hole adapted to the flange shaft, and the force rod is arranged vertically or horizontally; the actuator pressure head is movably set at the force end of the fatigue testing machine, and the actuator pressure head is connected to the force rod; the welding defect detection unit is used to detect changes in the welding area during fatigue testing.

[0009] Preferably, the flange and the shaft of the flange shaft specimen are welded, and the shaft of the flange shaft specimen is evenly provided with a plurality of grooves along the circumferential direction to form a polygonal shaft cross section, and the length of the grooves is less than the length of the shaft of the flange shaft specimen.

[0010] Preferably, when the fatigue testing device is used to test the bending moment working condition, the force rod is arranged vertically, and the movement path of the actuator pressure head passes through the center of the flange shaft test piece;

[0011] When the fatigue testing device is used to test torque conditions, the force rod is arranged horizontally, and the movement path of the actuator pressure head is separated from the center line of the flange shaft specimen by a preset distance.

[0012] Preferably, the welding defect detection unit adopts DIC digital speckle detection technology to detect deformation, strain and cracks in the welding area and identify structural abnormal areas.

[0013] Preferably, when the fatigue testing device is used to test torque working conditions, a transfer block is slidably provided on the force-adding rod, and the top end of the transfer block is connected to the actuator pressure head.

[0014] Preferably, the fatigue testing machine is provided with a lateral movement component at the force-applying end, and the lateral movement component includes:

[0015] The transverse track is horizontally arranged at the bottom end of the fatigue testing machine's force plate, and a hydraulic cylinder is provided at one end of the transverse track; a plurality of transverse slides are embedded in the transverse track, and the cross-section of the top of the transverse slide is set to be circular;

[0016] The transverse seat is slidably arranged on the transverse track, and a slider adapted to the transverse slide groove is arranged on the top of the transverse seat; the telescopic end of the hydraulic cylinder is connected to the transverse seat, and the actuator pressure head is installed in the transverse seat.

[0017] Preferably, the traverse seat comprises:

[0018] Support rods, four support rods are connected to the bottom end of the transverse seat;

[0019] A transfer box connected to the inner side of the support rod;

[0020] The arc-shaped fixing plate is telescopically arranged inside the adapter box. The front and rear ends of the actuator pressure head are provided with arc-shaped surfaces. The four arc-shaped fixing plates are respectively clamped and arranged on both sides of the front and rear ends of the actuator pressure head.

[0021] Preferably, an edge fixing plate is slidingly provided on the side end of the arc-shaped fixing plate, the edge fixing plate is provided with an inner flange, and a plurality of limit columns are arranged at intervals on the inner flange; a plurality of limit holes are provided on the left and right sides of the actuator pressure head, the limit columns are inserted into the limit holes, and the limit columns and the limit holes are transitionally or interference fit.

[0022] Preferably, the transfer box includes:

[0023] The air inlet pipe and the telescopic air outlet pipe are respectively connected to both sides of the adapter box. The air inlet pipe is connected to the pump body on the support rod. The multiple telescopic air outlet pipes are connected to the arc-shaped fixed plate. The telescopic air outlet pipe is set as a rigid pipe and can only be extended and retracted in the horizontal direction.

[0024] A first sealing plate is slidably connected to the inner wall of the transfer box, and a spring is connected between the first sealing plate and the side wall of the transfer box; two first sealing plates are symmetrically arranged on both sides of the intake pipe;

[0025] A second sealing plate, which is configured as a folding sealing plate and is slidably connected to the inner wall of the adapter box to seal the telescopic air outlet pipe;

[0026] A detection bent rod is connected to the first sealing plate and extends out of the adapter box. The detection end of the detection bent rod faces the actuator pressure head. The detection element of the detection bent rod is electrically connected to the controller and is used to detect the installation status of the actuator pressure head.

[0027] Preferably, a booster hydraulic cylinder is provided at the center of the transverse shift seat, and an auxiliary pressure roller is connected to the telescopic end at the bottom of the booster hydraulic cylinder, and the auxiliary pressure roller is pressed against the center of the actuator pressure head.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] The fatigue testing device for the flange shaft of a new energy vehicle provided by the present invention adopts a movably arranged actuator pressure head to adjust the relative position of the actuator pressure head and the flange shaft specimen, thereby changing the force application point during the fatigue test, so that the device can perform fatigue testing under bending moment or torque conditions without removing the actuator pressure head, and adjust the torque size. There is no need to reposition the flange shaft specimen and the actuator pressure head, thereby improving the applicability of the fatigue test and realizing the integrated design of the testing device.

[0030] The fatigue testing device for the flange shaft of a new energy vehicle described in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the structure of the torque working condition test of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the bending moment working condition test of the present invention;

[0034] Figure 3 For the present invention Figure 1 Schematic diagram of the lateral structure;

[0035] Figure 4 Schematic diagram of the structure of the transverse movement assembly in the present invention;

[0036] Figure 5 Schematic diagram of the structure of the actuator pressure head in the present invention;

[0037] Figure 6 It is a structural schematic diagram of the transverse sliding groove and the transverse sliding seat in the present invention;

[0038] Figure 7 Schematic diagram of the cross-sectional structure of the transverse sliding chute in the present invention;

[0039] Figure 8 Schematic diagram of the installation structure of the arc-shaped fixing plate in the present invention (cross-section view of the adapter box);

[0040] Figure 9 Schematic diagram of the cross-sectional structure of the transfer box of the present invention;

[0041] Figure 10 It is a structural schematic diagram of the auxiliary pressure roller in the present invention.

[0042] In the figure: 1. Flange fixing block; 2. Flange shaft test piece; 3. Cutting groove; 4. Force rod; 5. Through hole; 6. Actuator pressure head; 7. Adapter block; 11. Transverse track; 12. Transverse seat; 13. Hydraulic cylinder; 14. Transverse slide; 15. Support rod; 16. Adapter box; 17. Arc fixing plate; 18. Edge fixing plate; 19. Inner flange; 21. Limiting column; 22. Limiting hole; 23. Inlet pipe; 24. Telescopic outlet pipe; 25. First sealing plate; 26. Second sealing plate; 27. Detection bending rod; 28. Booster hydraulic cylinder; 29. ​​Auxiliary pressure roller; 30. Spring. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0044] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0045] Example 1:

[0046] like Figure 1-Figure 3 As shown, the present invention provides a fatigue testing device for a flange shaft of a new energy vehicle, comprising:

[0047] Flange fixing block 1, force rod 4, actuator pressure head 6 and welding defect detection unit, the flange fixing block 1 is installed on the test bench, the flange shaft specimen 2 is installed on one side of the flange fixing block 1, and the shaft cross-section of the flange shaft specimen 2 is set to be polygonal; the force rod 4 is sleeved on the flange shaft and one end is provided with a polygonal through hole 5 adapted to the flange shaft, the force rod 4 is arranged vertically or horizontally; the actuator pressure head 6 is movably set at the force end of the fatigue testing machine, and the actuator pressure head 6 is connected to the force rod 4; the welding defect detection unit is used to detect changes in the welding area during fatigue testing.

[0048] The working principle and beneficial effects of the above technical solution are:

[0049] The present invention provides a fatigue testing device for flange shafts of new energy vehicles. During fatigue testing of flange shafts of new energy vehicles, a flange shaft specimen 2 is bolted to a flange fixing block 1, with the axis of the flange shaft specimen 2 positioned horizontally. A through hole 5 of a force rod 4 is sleeved onto the shaft of the flange shaft specimen 2, with each side of the polygonal cross-section precisely aligned with the polygonal through hole 5. The polygonal shaft and polygonal through hole 5 are pluggable both horizontally and vertically.

[0050] When the fatigue testing apparatus is used to test bending moment conditions, the force rod 4 is arranged vertically, the force plate of the fatigue testing machine is connected to the actuator ram 6, and the centerline of the force rod 4 passes through the center of the flange shaft specimen 2. The fatigue testing machine is started to move in the vertical direction, driving the actuator ram 6 to move, applying pressure to the force rod 4, and thus applying a bending moment to the flange shaft specimen 2. Through cyclic pressure loading, the flange shaft specimen 2 is fatigue tested under bending moment conditions.

[0051] When fatigue testing is performed under torque conditions, force rod 4 is arranged horizontally, and actuator ram 6 is connected to force rod 4 so that the centerline of force rod 4 is separated from the axis of flange shaft specimen 2 by a preset, adjustable distance. The fatigue testing machine is activated and moved vertically, driving actuator ram 6 to apply pressure to force rod 4, which in turn applies torque to flange shaft specimen 2. Cyclic pressure loading is then used to perform fatigue testing on flange shaft specimen 2 under torque conditions.

[0052] The welding defect detection unit is used to detect changes in the welding area during the fatigue test, such as deformation and cracks of the flange shaft specimen 2 after the fatigue test, and the structural stability of the flange shaft specimen 2 under fatigue conditions is evaluated in turn.

[0053] Through the above-mentioned structural design, a movable actuator pressure head 6 is used to adjust the relative position of the actuator pressure head 6 and the flange shaft specimen 2, thereby changing the force application point during fatigue testing, so that the device can perform fatigue testing under bending moment or torque conditions without removing the actuator pressure head 6, and adjust the torque size without repositioning the flange shaft specimen 2 and the actuator pressure head 6, thereby improving the applicability of the fatigue test and realizing the integrated design of the test device.

[0054] Example 2:

[0055] like Figure 1-Figure 3 As shown, based on the above-mentioned embodiment 1, the flange plate and the shaft body of the flange shaft specimen 2 are welded, and a plurality of grooves 3 are evenly arranged on the shaft body of the flange shaft specimen 2 along the circumferential direction to form a polygonal shaft cross-section, and the length of the grooves 3 is less than the length of the shaft body of the flange shaft specimen 2.

[0056] The working principle and beneficial effects of the above technical solution are:

[0057] The flange shaft specimen 2 is a welded flange shaft. Four grooves 3 are preferably arranged on the shaft body along the circumferential direction. The groove depth is preferably 1 / 5-1 / 3 of the shaft body diameter. The plug-in structure formed by the four grooves 3 and the through hole 5 can be matched after any rotation of 90 degrees. The polygonal plug-in form can prevent the force rod 4 and the flange shaft specimen 2 from deflecting during the force application process, thereby improving the force application stability and the accuracy of the test results.

[0058] Example 3:

[0059] like Figure 1-Figure 3 As shown, based on the above embodiment 1, when the fatigue testing device is used to test the bending moment working condition, the force rod 4 is arranged vertically, and the movement path of the actuator pressure head 6 passes through the center of the flange shaft specimen 2;

[0060] When the fatigue testing device is used to test the torque working condition, the force rod 4 is arranged horizontally, and the movement path of the actuator pressure head 6 is separated from the center line of the flange shaft specimen 2 by a preset distance.

[0061] The working principle and beneficial effects of the above technical solution are:

[0062] By adjusting the installation orientation of the force-adding rod 4, the relative position of the actuator pressure head 6 and the flange shaft specimen 2 is adjusted, thereby changing the force application point during the fatigue test, so that the device can perform fatigue testing under bending moment or torque conditions without disassembling the actuator pressure head 6.

[0063] Example 4:

[0064] On the basis of the above-mentioned embodiment 1, the welding defect detection unit adopts DIC digital speckle detection technology to detect deformation, strain and cracks in the welding area and identify structural abnormality areas.

[0065] The working principle and beneficial effects of the above technical solution are:

[0066] The welding defect detection unit uses DIC digital speckle detection technology to spray a layer of high-contrast, randomly distributed black and white speckle pattern on the welding area; an industrial camera is used to collect images of the welding area before and after the fatigue test, calculate the displacement of each pixel point, and calculate the full-field strain distribution (including in-plane strain and shear strain) and deformation information of the measured area, identify the deformation, strain and crack conditions in the welding area, and mark the structural abnormalities.

[0067] Example 5:

[0068] like Figure 1 、 Figure 3 As shown, based on the above embodiment 3, when the fatigue testing device is used to test the torque working condition, an adapter block 7 is slidably provided on the force adding rod 4, and the top end of the adapter block 7 is connected to the actuator pressure head 6.

[0069] The working principle and beneficial effects of the above technical solution are:

[0070] The cross-section of the boosting rod 4 is set to be rectangular, and the adapter block 7 is adapted to be provided with a rectangular through-hole. By sliding the adapter block 7 on the boosting rod 4, the force application point can be adjusted to meet different torque test requirements. The actuator pressure head 6 is connected to the adapter block 7 by a detachable method such as plug-in connection and screw connection. The connection end between the adapter block 7 and the actuator pressure head 6 and the connection end between the boosting rod 4 and the actuator pressure head 6 are provided with the same plug-in block, and the actuator pressure head 6 is provided with an adaptive socket. This allows the boosting rod 4 to be connected to the actuator pressure head 6 when it is arranged vertically without the adapter block 7, and when it is arranged horizontally with the adapter block 7. The interface is unified and does not need to be replaced. It is only necessary to adjust the horizontal position of the actuator pressure head 6.

[0071] Example 6:

[0072] like Figure 4-Figure 7As shown, based on the above embodiment 1, the fatigue testing machine is provided with a lateral movement assembly at the force application end, and the lateral movement assembly includes:

[0073] A transverse track 11 is horizontally arranged at the bottom end of the fatigue testing machine force plate, and a hydraulic cylinder 13 is provided at one end of the transverse track 11; a plurality of transverse chutes 14 are embedded in the transverse track 11, and the top cross-section of the transverse chutes 14 is set to be circular;

[0074] The transverse seat 12 is slidably arranged on the transverse rail 11, and a slider adapted to the transverse slide groove 14 is arranged at the top of the transverse seat 12; the telescopic end of the hydraulic cylinder 13 is connected to the transverse seat 12, and the actuator pressure head 6 is installed in the transverse seat 12.

[0075] The working principle and beneficial effects of the above technical solution are:

[0076] When the transverse movement assembly is in use, the hydraulic cylinder 13 is activated to extend or retract, pushing the transverse movement seat 12 to slide along the transverse movement track 11, thereby adjusting the horizontal position of the transverse movement seat 12 and the actuator pressure head 6. A plurality of transverse movement slots 14 are embedded in the transverse movement track 11. When the fatigue testing machine force plate applies pressure, the pressure is shared by the plurality of transverse movement slots 14. The top surface of the transverse movement slot 14 is set to be circular. The pressure exerted by the slider on the transverse movement slot 14 can be evenly transmitted to the transverse movement track 11 through the circular contact surface. The circular part of the transverse movement slot 14 wraps a larger area around the slider, which improves the pressure dispersion effect, prevents the transverse movement track 11 from being crushed and deformed when pressure is applied, and improves the position accuracy of the actuator pressure head 6.

[0077] Example 7:

[0078] like Figure 4 、 Figure 8 As shown, based on the above embodiment 6, the traverse seat 12 includes:

[0079] Support rods 15, four support rods 15 are connected to the bottom end of the transverse seat 12;

[0080] The adapter box 16 is connected to the inner side of the support rod 15;

[0081] The arc-shaped fixing plate 17 is telescopically arranged inside the adapter box 16 , and the front and rear ends of the actuator pressure head 6 are provided with arc-shaped surfaces. The four arc-shaped fixing plates 17 are respectively clamped and arranged on both sides of the front and rear ends of the actuator pressure head 6 .

[0082] An edge fixing plate 18 is slidably provided at the side end of the arc-shaped fixing plate 17, and the edge fixing plate 18 is provided with an inner flange 19, and a plurality of limit columns 21 are arranged at intervals on the inner flange 19; a plurality of limit holes 22 are provided on the left and right sides of the actuator pressure head 6, and the limit columns 21 are inserted into the limit holes 22, and the limit columns 21 and the limit holes 22 are transitionally or interference fit.

[0083] The working principle and beneficial effects of the above technical solution are:

[0084] Four support rods 15 are provided at the bottom of the traverse seat 12. These support rods 15 are connected to an arc-shaped fixing plate 17 via an adapter box 16. The front and rear ends of the actuator ram 6 are also configured in an arc shape. The arc-shaped fixing plate 17 clamps the actuator ram 6, with the clamping positions located on both sides of the front and rear ends of the actuator ram 6. The arc-shaped fixing plate 17 is connected to the adapter box 16 via elastic members, ensuring sufficient clamping force on the actuator ram 6. The contact limit of the arc surface prevents the actuator ram 6 from rotating about its own axis, maintaining the actuator ram 6 in a horizontal position.

[0085] After the actuator ram 6 is clamped by the curved fixing plate 17, the edge fixing plate 18 on the side of the curved fixing plate 17 is slid so that the limiting posts 21 on the edge fixing plate 18 are inserted into the limiting holes 22 of the actuator ram 6, thereby limiting and fixing the left and right sides of the actuator ram 6. The limiting posts 21 and the limiting holes 22 use a transition or interference fit, eliminating lateral play, ensuring a stable insertion and preventing the actuator ram 6 from slipping out axially.

[0086] The above-described structural design secures the actuator ram 6 through a combination of clamping and plugging, achieving high-precision positioning of the actuator ram 6 and enabling it to move with the transverse displacement seat 12. Four clamping points are provided during the pressure application process, providing excellent pressure resistance and preventing displacement of the actuator ram 6 under pressure. With a detachable actuator ram 6, after a period of use, the edge fixing plate 18 can be slid out, the curved fixing plate 17 can be released, and the actuator ram 6 can be removed for deformation inspection or replacement. This prevents deformation of the actuator ram 6 from affecting the force application effect after frequent pressure application, thereby improving the accuracy of fatigue testing.

[0087] Example 8:

[0088] like Figure 8 、 Figure 9 As shown, based on the above embodiment 7, the adapter box 16 includes:

[0089] The air inlet pipe 23 and the telescopic air outlet pipe 24 are respectively connected to both sides of the adapter box 16. The air inlet pipe 23 is connected to the pump body on the support rod 15. The multiple telescopic air outlet pipes 24 are connected to the arc-shaped fixed plate 17. The telescopic air outlet pipes 24 are set as rigid pipes and can only be extended and retracted in the horizontal direction.

[0090] A first sealing plate 25 is slidably connected to the inner wall of the adapter box 16. A spring 30 is connected between the first sealing plate 25 and the side wall of the adapter box 16. Two first sealing plates 25 are symmetrically arranged on both sides of the intake pipe 23.

[0091] A second sealing plate 26 is configured as a foldable sealing plate. The second sealing plate 26 is slidably connected to the inner wall of the adapter box 16 and blocks the telescopic air outlet pipe 24.

[0092] The detection bent rod 27 is connected to the first sealing plate 25 and extends out of the adapter box 16. The detection end of the detection bent rod 27 is facing the actuator pressure head 6. The detection element of the detection bent rod 27 is electrically connected to the controller and is used to detect the installation status of the actuator pressure head 6.

[0093] The working principle and beneficial effects of the above technical solution are:

[0094] After the actuator ram 6 is mounted on the curved fixing plate 17, the pump on the support rod 15 is activated. The pump supplies air into the adapter box 16 through the air inlet pipe 23, increasing the gas pressure within the adapter box 16. This pushes the first sealing plate 25 toward both sides, compressing and accumulating energy in the spring 30. The first sealing plate 25 then moves and folds the second sealing plate 26. The second sealing plate 26 then passes over the opening of the telescopic air outlet pipe 24, releasing the blockage and allowing air to enter the telescopic air outlet pipe 24. For example, the telescopic air outlet pipe 24 can be configured as two nested rigid tubes with an elastic member connected between them. This allows the telescopic air outlet pipe 24 to maintain support for the curved fixing plate 17 while achieving telescopic expansion. The telescopic air outlet pipe 24 extends horizontally, driving the curved fixing plate 17 toward the center, eliminating the gap between the curved surface of the actuator ram 6 and ensuring that, after clamping the actuator ram 6, it does not shift under pressure.

[0095] When the first sealing plate 25 moves to both sides, it drives the detection bent rod 27 to move and extend out of the adapter box 16. The detection end on the detection bent rod 27 is set to a distance sensor, an industrial camera or an infrared sensor and other equipment. When the actuator pressure head 6 shifts or falls out, the detection end can obtain the distance change through monitoring data or image calculation, receive position change signals, etc., monitor the position state of the actuator pressure head 6, evaluate the installation status of the actuator pressure head 6, and promptly discover the displacement of the actuator pressure head 6 during fatigue testing, thereby improving the reliability of the device.

[0096] Example 9:

[0097] like Figure 4 、 Figure 10 As shown, based on the above-mentioned embodiment 6, a booster hydraulic cylinder 28 is provided at the center of the transverse shift seat 12, and an auxiliary pressure roller 29 is connected to the telescopic end at the bottom of the booster hydraulic cylinder 28, and the auxiliary pressure roller 29 is pressed against the center of the actuator pressure head 6.

[0098] The working principle and beneficial effects of the above technical solution are:

[0099] Because the center of the actuator ram 6 is connected to the adapter block 7 or the booster rod 4, a booster hydraulic cylinder 28 is provided to drive the auxiliary pressure roller 29 to move, bringing it into contact with the center of the actuator ram 6 and maintaining a certain pressure, thereby preventing deformation of the middle portion of the actuator ram 6 under pressure. A force sensor can be installed on the booster rod 4. When the actual applied pressure is lower than the preset value, the booster hydraulic cylinder 28 can be activated to push the actuator ram 6 slightly to account for the impact on the position accuracy of the actuator ram 6, helping to eliminate position deviation and achieve pressure compensation.

[0100] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0101] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0102] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. Fatigue testing device for flange shaft of new energy vehicle, characterized in that: include: A flange fixing block (1), a force rod (4), an actuator pressure head (6) and a welding defect detection unit, wherein the flange fixing block (1) is installed on a test bench, a flange shaft test piece (2) is installed on one side of the flange fixing block (1), and the shaft cross section of the flange shaft test piece (2) is set to be polygonal; the force rod (4) is sleeved on the flange shaft and one end is provided with a polygonal through hole (5) adapted to the flange shaft, and the force rod (4) is arranged vertically or horizontally; the actuator pressure head (6) is movably arranged at the force end of the fatigue testing machine, and the actuator pressure head (6) is connected to the force rod (4); The weld defect detection unit is used to detect changes in the weld area during fatigue testing.

2. The fatigue testing device for flange shaft of new energy vehicle according to claim 1, characterized in that: The flange and shaft of the flange shaft test piece (2) are welded, and the shaft of the flange shaft test piece (2) is evenly provided with a plurality of grooves (3) along the circumferential direction to form a polygonal shaft cross section, and the length of the grooves (3) is less than the length of the shaft of the flange shaft test piece (2).

3. The fatigue testing device for flange shaft of new energy vehicle according to claim 1, characterized in that: When the fatigue testing device is used to test the bending moment working condition, the force rod (4) is arranged vertically, and the movement path of the actuator pressure head (6) passes through the center of the flange shaft test piece (2); When the fatigue testing device is used to test a torque working condition, the force rod (4) is arranged horizontally, and the movement path of the actuator pressure head (6) is spaced a preset distance from the center line of the flange shaft test piece (2).

4. The fatigue testing device for flange shaft of new energy vehicle according to claim 1, characterized in that: The welding defect detection unit uses DIC digital speckle detection technology to detect deformation, strain and cracks in the welding area and identify structural abnormalities.

5. The fatigue testing device for flange shaft of new energy vehicle according to claim 3, characterized in that: When the fatigue testing device is used to test a torque working condition, a transfer block (7) is slidably provided on the force-adding rod (4), and the top end of the transfer block (7) is connected to the actuator pressure head (6).

6. The fatigue testing device for flange shaft of new energy vehicle according to claim 5, characterized in that: The fatigue testing machine is equipped with a lateral movement component at the force-adding end. The lateral movement component includes: A transverse track (11) is horizontally arranged at the bottom end of the fatigue testing machine force plate, and a hydraulic cylinder (13) is arranged at one end of the transverse track (11); a plurality of transverse chutes (14) are embedded in the transverse track (11), and the top cross-section of the transverse chutes (14) is arranged to be circular; The transverse seat (12) is slidably arranged on the transverse track (11), and a slider adapted to the transverse slide groove (14) is arranged on the top of the transverse seat (12); the telescopic end of the hydraulic cylinder (13) is connected to the transverse seat (12), and the actuator pressure head (6) is installed in the transverse seat (12).

7. The fatigue testing device for flange shaft of new energy vehicle according to claim 6, characterized in that: The traverse seat (12) comprises: Support rods (15), four support rods (15) are connected to the bottom end of the transverse seat (12); A transfer box (16), the transfer box (16) is connected to the inner side of the support rod (15); The arc-shaped fixing plate (17) is telescopically arranged inside the adapter box (16), and the front and rear ends of the actuator pressure head (6) are provided with arc-shaped surfaces. The four arc-shaped fixing plates (17) are respectively clamped and arranged on both sides of the front and rear ends of the actuator pressure head (6).

8. The fatigue testing device for flange shaft of new energy vehicle according to claim 7, characterized in that: An edge fixing plate (18) is slidably provided at the side end of the arc-shaped fixing plate (17), and the edge fixing plate (18) is provided with an inner flange (19), and a plurality of limiting columns (21) are arranged at intervals on the inner flange (19); a plurality of limiting holes (22) are provided on the left and right sides of the actuator pressure head (6), and the limiting columns (21) are inserted into the limiting holes (22), and the limiting columns (21) and the limiting holes (22) are transitionally or interference-fitted.

9. The fatigue testing device for flange shaft of new energy vehicle according to claim 7, characterized in that: The transfer box (16) comprises: An air inlet pipe (23) and a telescopic air outlet pipe (24) are respectively connected to both sides of the adapter box (16); the air inlet pipe (23) is connected to the pump body on the support rod (15); a plurality of telescopic air outlet pipes (24) are connected to the arc-shaped fixed plate (17); the telescopic air outlet pipes (24) are set as rigid pipes and can only be telescoped in the horizontal direction; A first sealing plate (25), the first sealing plate (25) is slidably connected to the inner wall of the transfer box (16), and a spring (30) is connected between the first sealing plate (25) and the side wall of the transfer box (16); two first sealing plates (25) are symmetrically arranged on both sides of the intake pipe (23); A second sealing plate (26), the second sealing plate (26) is configured as a folding sealing plate, the second sealing plate (26) is slidably connected to the inner wall of the transfer box (16), and the second sealing plate (26) blocks the telescopic air outlet pipe (24); A detection bent rod (27) is connected to the first sealing plate (25) and extends out of the adapter box (16). The detection end of the detection bent rod (27) faces the actuator pressure head (6). The detection element of the detection bent rod (27) is electrically connected to the controller and is used to detect the installation status of the actuator pressure head (6).

10. The fatigue testing device for flange shaft of new energy vehicle according to claim 7, characterized in that: A booster hydraulic cylinder (28) is provided at the center of the transverse shift seat (12), and an auxiliary pressure roller (29) is connected to the telescopic end at the bottom of the booster hydraulic cylinder (28), and the auxiliary pressure roller (29) is pressed against the center of the actuator pressure head (6).

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