A kind of engineering machinery drive axle housing bending fatigue testing machine

Abstract

The utility model discloses an engineering machinery drive axle housing anti-bending fatigue testing machine, including four column gantry, actuator, ground platform, workpiece support, jacking cylinder, actuator jacking mobile device, support jacking mobile device and drive arrangement, the actuator is connected on crossbeam through frame jig, and the upper and lower pressing plate of frame jig is arranged respectively on the upper and lower of crossbeam, and the distance between upper and lower pressing plate is greater than the height of crossbeam, is equipped with four actuator jacking mobile devices on upper pressing plate, is equipped with two support jacking mobile devices on workpiece support, and jacking cylinder and drive arrangement are all arranged on upper pressing plate. The utility model discloses through setting actuator jacking mobile device and jacking cylinder cooperation, has realized electric control actuator left and right linear movement, through setting support jacking mobile device, has realized through second gyro wheel drive workpiece support left and right linear movement, has improved work efficiency greatly, has reduced the labor intensity of operator.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery drive axle production technology, and in particular to an engineering machinery drive axle shell bending fatigue testing machine. Background Technology

[0002] Some components, such as the drive axle housing of construction machinery, are prone to bending deformation due to the weight of vehicles and goods. Furthermore, the varying road conditions under which vehicles travel mean this bending deformation is unpredictable, inevitably causing fatigue damage to the drive axle housing and affecting its service life. After design and manufacturing, it is necessary to conduct bending fatigue life testing using a bending fatigue testing machine to verify whether its design parameters, selected materials, and manufacturing processes meet the fatigue strength and service life requirements.

[0003] Currently, the vertical loading actuators of existing fatigue testing machines for drive axle housings in engineering machinery are typically secured to the crossbeam using pressure plates and bolts. When these machines are used to test drive axles of different specifications, the positions of the vertical loading actuator and workpiece support need to be adjusted according to the test location of the product. However, the vertical loading actuator is a heavy-duty structure, and during relocation and installation, operators may even need to work at heights to loosen bolts, move, and tighten them. For such a heavy structure, the lack of a drive and force-reducing mechanism results in high labor intensity and low operational safety. Similarly, the mounting bracket for the test workpiece is also a heavy component, located below the crossbeam, making hoisting and relocation difficult. Utility Model Content

[0004] To address the problems of difficult vertical loading actuator movement and installation, high operator workload, and low operational safety in existing fatigue testing machines for drive axle housings of engineering machinery, this invention provides a bending fatigue testing machine for drive axle housings of engineering machinery. By incorporating an actuator lifting and moving device in conjunction with a lifting cylinder, the machine achieves linear left-right movement of the electrically controlled actuator. Furthermore, the inclusion of a support lifting and moving device enables easy linear left-right movement of the workpiece support via a second roller. This eliminates the need for operators to work at heights, loosen bolts, or perform other tasks, significantly improving work efficiency and reducing operator workload. The machine can also be easily interchanged with drive axle housings of different specifications for bending fatigue testing, enhancing its practicality.

[0005] To achieve the above objectives, this utility model provides a bending fatigue testing machine for a drive axle housing of engineering machinery, comprising a four-column gantry frame, actuators, a ground platform, and a workpiece support. The ground platform is fixedly connected to the ground. The four-column gantry frame is installed on the ground platform and includes four evenly distributed columns in an array. A longitudinal beam is provided at the upper end between the two columns on the left and right sides, and a crossbeam is provided between the two longitudinal beams. There are two actuators, which apply force to the force points at both ends of the workpiece. The upper end of the actuator is connected to the crossbeam. There are two workpiece supports, which are connected to both ends of the workpiece and are located in the middle of the ground platform corresponding to the crossbeam. The invention is characterized by further including a lifting cylinder, an actuator lifting and moving device, a support lifting and moving device, and a driving device.

[0006] The actuator is connected to the crossbeam via a frame-shaped clamp. The frame-shaped clamp includes an upper pressure plate, a lower pressure plate, and screws. The upper pressure plate and the lower pressure plate are respectively located above and below the crossbeam. The four corners of the upper pressure plate and the lower pressure plate are fixedly connected by four screws. The distance between the upper pressure plate and the lower pressure plate is 8-12mm greater than the height of the crossbeam. The actuator is mounted on the lower pressure plate.

[0007] The lifting cylinder is mounted on the upper pressure plate, and its piston rod end is connected to the pressure plate. During operation, the piston rod and the pressure plate pass through the upper pressure plate and are supported on the upper plane of the crossbeam.

[0008] The upper pressure plate is equipped with four actuator lifting and moving devices arranged in an array, which are used to drive the actuator to move linearly left and right along the crossbeam.

[0009] The workpiece support is equipped with two support lifting and moving devices arranged symmetrically to drive the workpiece support to move linearly left and right.

[0010] The drive device is mounted on the upper pressure plate and is used to drive the actuator lifting and moving device to move linearly left and right on the crossbeam, thereby driving the actuator to move linearly left and right along the crossbeam.

[0011] Preferably, the actuator lifting and moving device includes a first bushing, a lifting shaft, a first wheel axle, a first roller, a first disc spring, a first pressure block, a first adjusting bolt, and a first locking nut. The first bushing is fixedly connected to the upper pressure plate. The first bushing has a first threaded hole that mates with the first adjusting bolt. The lower end of the first threaded hole has a coaxial first layer hole, and the lower end of the first layer hole has a coaxial second layer hole. The first pressure block is fitted into the first layer hole. The first adjusting bolt is threaded into the first threaded hole, and its lower end rests on the upper surface of the first pressure block. The lifting shaft is fitted into the second layer hole. The first disc spring is located between the first pressure block and the lifting shaft and can elastically extend and retract within the first and second layer holes. The first locking nut is threaded to the outside of the first adjusting bolt and is located on the upper surface of the first bushing. The lower end of the lifting shaft has an opening groove that passes through the left and right sides. The two ends of the first wheel axle are fixedly connected to the front and rear side walls of the opening groove. The first roller is fitted into the middle of the first wheel axle and forms a rotatable connection with the first wheel axle.

[0012] Preferably, the actuator lifting and moving device further includes a first positioning screw, a first radial threaded hole is provided in the middle of the outer side of the first bushing, and a first radial waist-shaped blind hole is provided in the vertical direction on the outer side of the lifting shaft at a position corresponding to the first radial threaded hole. The first positioning screw is threaded into the first radial threaded hole and its end is inserted into the first radial waist-shaped blind hole to orient the first roller to move up and down.

[0013] The first positioning screw serves both to position the first wheel shaft and the first roller, and to prevent the lifting shaft and the first roller from falling off.

[0014] Preferably, the driving device includes a drive motor and a reducer, a gear and a rack. The drive motor and reducer are located on the left front side or the right front side of the upper pressure plate and are fixedly connected to the upper pressure plate through a motor bracket. The gear is located at the output shaft end of the reducer, and the rack is located at the upper end of the front side of the crossbeam and meshes with the gear for transmission.

[0015] Preferably, the reducer is a cycloidal pinwheel reducer.

[0016] Preferably, the support lifting and moving device includes a second bushing, a T-shaped lifting shaft, a second roller, a second disc spring, a second pressure block, a second adjusting bolt, and a second locking nut. The second bushing is fixedly connected to the middle of the outer flange at the lower end of the workpiece support. The second bushing has a second threaded hole that mates with the second adjusting bolt. The lower end of the second threaded hole has a coaxial third layer hole, and the lower end of the third layer hole has a coaxial fourth layer hole. The second pressure block is fitted into the third layer hole. The second adjusting bolt is threaded into the second threaded hole, and its lower end rests on the upper surface of the second pressure block. The upper end of the T-shaped lifting shaft is fitted into the fourth layer hole. The second disc spring is located between the second pressure block and the T-shaped lifting shaft and can elastically extend and retract within the third and fourth layer holes. The second locking nut is threaded to the outside of the second adjusting bolt and is located on the upper surface of the second bushing. The left and right ends of the lower horizontal shaft of the T-shaped lifting shaft are fitted with second rollers, and the second rollers are rotatably connected to the T-shaped lifting shaft.

[0017] A horizontal rectangular groove is provided on the ground platform at the position corresponding to the lower horizontal axis of the T-shaped lifting shaft. The second rollers at the left and right ends of the T-shaped lifting shaft are located in the rectangular groove and can roll in a straight line along the rectangular groove during operation.

[0018] Preferably, the support lifting and moving device further includes a second positioning screw, a second radial threaded hole is provided in the middle of the outer side of the second bushing, a second radial waist-shaped blind hole is provided on the outer side of the T-shaped lifting shaft at a position corresponding to the second radial threaded hole, the second positioning screw is threaded into the second radial threaded hole, and the end is inserted into the second radial waist-shaped blind hole to orient the second roller to move up and down.

[0019] The second positioning screw serves both to position the T-shaped lifting shaft and the second roller, and to prevent the T-shaped lifting shaft and the second roller from falling off.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting the actuator lifting and moving device in conjunction with the lifting cylinder, the electric control actuator can move linearly left and right. By setting the bracket lifting and moving device, the workpiece bracket can be easily moved linearly left and right by the second roller. There is no need for the operator to work at height, and there is no need for the operator to loosen bolts, move, and tighten them. This greatly improves work efficiency, reduces the labor intensity of the operator, and allows for easy replacement of drive axle housings of different specifications for bending fatigue testing, thus improving the practicality of the bending fatigue testing machine.

[0021] 1. This utility model, by setting up an actuator lifting and moving device, a lifting cylinder, and a drive device, when the lifting cylinder is pressurized, the piston rod of the lifting cylinder extends downward, and the pressure plate at its end presses against the crossbeam. Through the screw, the lower pressure plate moves upward to clamp the crossbeam, thereby locking the actuator. The actuator applies force to the corresponding end of the workpiece, and the bending fatigue test can begin. When the piston rod of the lifting cylinder retracts and the oil pressure is released, the upper and lower pressure plates move downward synchronously. The lower pressure plate disengages from the crossbeam and releases the locking state with the crossbeam. The upper pressure plate drives the actuator lifting and moving device to move downward until the first roller falls onto the crossbeam. At the same time, under the action of the disc spring after the first adjusting bolt is adjusted and the first locking nut is locked, the first bushing can drive both the upper and lower pressure plates to disengage from the crossbeam. At this time, the drive motor and reducer are started, the drive gear rotates and meshes with the rack, thereby driving the upper pressure plate and the actuator lifting and moving device to move linearly left and right on the upper plane of the crossbeam with the first roller.

[0022] 2. This utility model, by setting up a support lifting and moving device, allows the T-shaped lifting shaft to lift the workpiece support by a suitable distance from the ground platform when the mounting bolts of the fixed workpiece support are loosened. Under the action of the disc spring after adjustment by the second adjusting bolt and locking by the second locking nut, the T-shaped lifting shaft can lift the workpiece support. At this time, the second roller on the T-shaped lifting shaft can roll left and right in a straight line in the rectangular groove in the middle of the ground platform, thereby driving the workpiece support to move left and right in a straight line along the rectangular groove to the target position, saving time and effort. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the left-side structure of an embodiment of the present invention;

[0025] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 4 This is a longitudinal sectional view of the actuator lifting and moving device of this utility model.

[0027] Figure 5 for Figure 1 Enlarged view at point B in the middle;

[0028] Figure 6 This is a longitudinal sectional view of the support lifting and moving device of this utility model.

[0029] Figure 7 for Figure 2 Enlarged view at point D;

[0030] Figure 8 for Figure 2 Enlarged view of point C in the middle.

[0031] In the diagram: 1. Ground platform; 101. Rectangular groove; 2. Four-column gantry frame; 201. Column; 202. Horizontal beam; 203. Longitudinal beam; 3. Actuator; 4. Frame-shaped clamp; 401. Upper pressure plate; 402. Screw; 403. Lower pressure plate; 5. Actuator lifting and moving device; 501. First bushing; 502. First adjusting bolt; 503. First locking nut; 504. First pressure block; 505. First disc spring; 506. Lifting shaft; 5061. First radial waist-shaped blind hole; 507. First wheel axle; 508. First roller; 5 9. First positioning screw; 6. Lifting cylinder; 601. Pressure plate; 7. Drive device; 701. Drive motor and reducer; 702. Gear; 703. Rack; 8. Support lifting and moving device; 801. Second bushing; 802. Second adjusting bolt; 803. Second locking nut; 804. Second pressure block; 805. Second disc spring; 806. T-shaped lifting shaft; 8061. Second radial waist-shaped blind hole; 807. Second roller; 808. Second positioning screw; 9. Right workpiece support; 10. Workpiece; 11. Left workpiece support. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1 to 8 As shown, this utility model embodiment includes a four-column gantry frame 2, an actuator 3, a ground platform 1, a left workpiece support 11, a right workpiece support 9, a lifting cylinder 6, an actuator lifting and moving device 5, a support lifting and moving device 8, and a drive device 7. The ground platform 1 is fixedly connected to the ground. The four-column gantry frame 2 is installed on the ground platform 1 and includes four evenly distributed columns 201. The upper end of the left and right columns 201 is provided with a longitudinal beam 203, and a crossbeam 202 is provided between the two longitudinal beams 203. There are two actuators 3, which apply force to the two ends of the workpiece 10 respectively. The upper end of the actuator 3 is connected to the crossbeam 202. The left workpiece support 11 and the right workpiece support 9 are respectively connected to the two ends of the workpiece 10 and are located in the middle of the ground platform 1 at the position corresponding to the crossbeam 202.

[0034] The actuator 3 is connected to the crossbeam 202 via a frame-shaped clamp 4. The frame-shaped clamp 4 includes an upper pressure plate 401, a lower pressure plate 403, and screws 402. The upper pressure plate 401 and the lower pressure plate 403 are respectively located above and below the crossbeam 202. The four corners of the upper pressure plate 401 and the lower pressure plate 403 are fixedly connected by four screws 402. The distance between the upper pressure plate 401 and the lower pressure plate 403 is 8-12 mm greater than the height of the crossbeam 202. The actuator 3 is installed on the lower pressure plate 403.

[0035] The lifting cylinder 6 is installed on the upper pressure plate 401, and its piston rod end is connected to the pressure plate 601. When working, the piston rod and the pressure plate 601 pass through the upper pressure plate 401 and are supported on the upper plane of the crossbeam 202.

[0036] The upper pressure plate 401 is equipped with four actuator lifting and moving devices 5 arranged in an array, which are used to drive the actuator 3 to move linearly left and right along the crossbeam.

[0037] The left workpiece support 11 and the right workpiece support 9 are each equipped with two support lifting and moving devices 8 arranged symmetrically on the left and right sides, which are used to drive the left workpiece support 11 and the right workpiece support 9 to move linearly left and right.

[0038] The drive device 7 is mounted on the upper pressure plate 401 and is used to drive the actuator lifting and moving device 5 to move linearly left and right on the crossbeam 202, thereby driving the actuator 3 to move linearly left and right along the crossbeam 202.

[0039] Preferably, the actuator lifting and moving device 5 includes a first bushing 501, a lifting shaft 506, a first wheel axle 507, a first roller 508, a first disc spring 505, a first pressure block 504, a first adjusting bolt 502, and a first locking nut 503. The first bushing 501 is fixedly connected to the upper pressure plate 401. The first bushing 501 has a first threaded hole that mates with the first adjusting bolt 502. The lower end of the first threaded hole has a coaxial first layer hole, and the lower end of the first layer hole has a coaxial second layer hole. The first pressure block 504 is sleeved in the first layer hole, and the first adjusting bolt 502 is threaded into the first threaded hole. The lower end of the first pressure block 504 is held on the upper surface of the first pressure block 504. The lifting shaft 506 is sleeved in the second layer hole. The first disc spring 505 is located between the first pressure block 504 and the lifting shaft 506, and can elastically extend and retract within the first layer hole and the second layer hole. The first locking nut 503 is threaded to the outside of the first adjusting bolt 502 and is located on the upper surface of the first bushing 501. The lower end of the lifting shaft 506 has an opening groove in the middle that passes through the left and right sides. The two ends of the first wheel shaft 507 are fixedly connected to the front and rear side walls of the opening groove. The first roller 508 is sleeved in the middle of the first wheel shaft 507 and forms a rotatable connection with the first wheel shaft 507.

[0040] Preferably, the first roller 508 is provided with a rolling bearing, and the inner ring of the rolling bearing is fastened to the first wheel shaft 507.

[0041] Preferably, the actuator lifting and moving device 5 also includes a first positioning screw 509, a first radial threaded hole in the middle of the outer side of the first bushing 501, a first radial waist-shaped blind hole 5061 in the vertical direction on the outer side of the lifting shaft 506 corresponding to the first radial threaded hole, the first positioning screw 509 being threaded into the first radial threaded hole, and the end being inserted into the first radial waist-shaped blind hole 5061 to orient the first roller 508 to move up and down.

[0042] The first positioning screw 509 is set to both position the first wheel shaft 507 and the first roller 508, and to prevent the lifting shaft 506 and the first roller 508 from falling off.

[0043] Preferably, the drive device 7 includes a drive motor and a reducer 701, a gear 702 and a rack 703. The drive motor and reducer 701 are located on the left front side or the right front side of the upper pressure plate 401 and are fixedly connected to the upper pressure plate 401 through a motor bracket 704. The gear 702 is located at the output shaft end of the reducer, and the rack 703 is located at the upper end of the front side of the crossbeam 202 and meshes with the gear 702 for transmission.

[0044] As a preferred option, a cycloidal pinwheel reducer is used.

[0045] Preferably, the support lifting and moving device 8 includes a second bushing 801, a T-shaped lifting shaft 806, a second roller 807, a second disc spring 805, a second pressure block 804, a second adjusting bolt 802, and a second locking nut 803. The second bushing 801 is fixedly connected to the middle of the lower outer flange of the left workpiece support 11 or the right workpiece support 9. The second bushing 801 has a second threaded hole that mates with the second adjusting bolt 802. The lower end of the second threaded hole has a coaxial third layer hole, and the lower end of the third layer hole has a coaxial fourth layer hole. The second pressure block 804 is sleeved in the third layer hole. Bolt 802 is threaded into the second threaded hole, and its lower end rests on the upper surface of the second pressure block 804. The upper end of the T-shaped lifting shaft 806 is sleeved in the fourth layer hole. The second disc spring 805 is located between the second pressure block 804 and the T-shaped lifting shaft 806, and can elastically expand and contract within the third and fourth layer holes. The second locking nut 803 is threaded onto the outside of the second adjusting bolt 802 and is located on the upper surface of the second bushing 801. The left and right ends of the horizontal shaft at the lower end of the T-shaped lifting shaft 806 are both sleeved with second rollers 807, and the second rollers 807 and the T-shaped lifting shaft 806 form a rotatable connection.

[0046] A horizontal rectangular groove 101 is provided on the ground platform 1 at the position corresponding to the lower horizontal axis of the T-shaped lifting shaft 806. The second rollers 807 at the left and right ends of the T-shaped lifting shaft 807 are located in the rectangular groove 101 and can roll in a straight line along the rectangular groove 101 when working.

[0047] Preferably, the support lifting and moving device 8 also includes a second positioning screw 808, a second radial threaded hole in the middle of the outer side of the second bushing 801, and a vertical second radial waist-shaped blind hole 8061 in the corresponding position on the outer side of the T-shaped lifting shaft 806. The second positioning screw 808 is threaded into the second radial threaded hole, and its end is inserted into the second radial waist-shaped blind hole 8061 to orient the second roller 807 to move up and down.

[0048] The second positioning screw 808 is used to position the T-shaped lifting shaft 806 and the second roller 807, and also to prevent the T-shaped lifting shaft 806 and the second roller 807 from falling off.

[0049] The working principle of this embodiment is as follows: When the lifting cylinder 6 applies hydraulic pressure, the piston rod of the lifting cylinder 6 extends downward, and the pressure plate 601 at its end presses against the crossbeam 202. Through the screw 402, the force is transmitted, causing the lower pressure plate 403 to move upward and clamp the crossbeam 202, thereby locking the actuator 3. The actuator 3 applies force to the corresponding stress point of the workpiece 10, and the bending fatigue test can begin. When the piston rod of the lifting cylinder 6 retracts and the hydraulic pressure is released, the upper pressure plate 401 and the lower pressure plate 403 move downward synchronously. The lower pressure plate 403 disengages from the crossbeam 202, releasing the locking state with the crossbeam 202. The upper pressure plate 401 drives the actuator to move downward. The lifting and moving device 5 moves down to the first roller 508 and falls onto the crossbeam 202. At the same time, under the action of the disc spring after the first bushing 501 is pre-adjusted by the first adjusting bolt 502 and locked by the first locking nut 503, it can drive the upper pressure plate 401 and the lower pressure plate 403 to disengage from the crossbeam 202. At this time, the drive motor and reducer 701 are started, the drive gear 702 rotates and meshes with the rack 703, thereby driving the actuator 3, which is fixedly connected to the upper pressure plate 401, to move the lifting and moving device 5 in a straight line on the upper plane of the crossbeam 202 along with the first roller 508 until the actuator 3 moves to the target position.

[0050] When the mounting bolts securing the left workpiece support 11 and the right workpiece support 9 are loosened, the T-shaped lifting shaft 806, under the action of the disc spring after being pre-adjusted by the second adjusting bolt 802 and locked by the second locking nut 803, can drive the left workpiece support 11 or the right workpiece support 9 to rise and move away from the upper plane of the ground platform 1 by an appropriate distance. At this time, the second roller 807 on the T-shaped lifting shaft 806 can roll linearly left and right in the rectangular groove 101 in the middle of the ground platform 1, thereby driving the left workpiece support 11 and the right workpiece support 9 to move linearly along the rectangular groove 101 to the target position.

[0051] This utility model achieves left and right linear movement of the electrically controlled actuator 3 by setting the actuator lifting and moving device 5 in cooperation with the lifting cylinder 6. By setting the bracket lifting and moving device 8, the left workpiece bracket 11 and right workpiece bracket 9 can be easily moved left and right linearly by the second roller 807. No high-altitude operation is required, and no loosening, moving, or tightening of bolts is required, which greatly improves work efficiency and reduces the labor intensity of the operator. Different specifications of drive axle housings can be easily replaced for bending fatigue testing, which improves the practicality of the bending fatigue testing machine.

[0052] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A bending fatigue testing machine for a drive axle shell of engineering machinery, comprising a four-column gantry frame, actuators, a ground platform, and a workpiece support, wherein the ground platform is fixedly connected to the ground, the four-column gantry frame is installed on the ground platform and includes four evenly distributed columns in an array, with longitudinal beams provided at the upper ends of the left and right columns, and a crossbeam provided between the two longitudinal beams, wherein two actuators are provided, each applying force to the force points at both ends of the workpiece, the upper end of the actuator being connected to the crossbeam, and two workpiece supports are provided, each connected to both ends of the workpiece, and positioned in the middle of the ground platform corresponding to the crossbeam, characterized in that: It also includes a lifting cylinder, an actuator lifting and moving device, a support lifting and moving device, and a drive device; The actuator is connected to the crossbeam via a frame-shaped clamp. The frame-shaped clamp includes an upper pressure plate, a lower pressure plate, and screws. The upper pressure plate and the lower pressure plate are respectively located above and below the crossbeam. The four corners of the upper pressure plate and the lower pressure plate are fixedly connected by four screws. The distance between the upper pressure plate and the lower pressure plate is 8-12mm greater than the height of the crossbeam. The actuator is mounted on the lower pressure plate. The lifting cylinder is mounted on the upper pressure plate, and its piston rod end is connected to the pressure plate. During operation, the piston rod and the pressure plate pass through the upper pressure plate and are supported on the upper plane of the crossbeam. The upper pressure plate is equipped with four actuator lifting and moving devices arranged in an array, which are used to drive the actuator to move linearly left and right along the crossbeam. The workpiece support is equipped with two support lifting and moving devices arranged symmetrically to drive the workpiece support to move linearly left and right. The drive device is mounted on the upper pressure plate and is used to drive the actuator lifting and moving device to move linearly left and right on the crossbeam, thereby driving the actuator to move linearly left and right along the crossbeam.

2. The bending fatigue testing machine for a drive axle housing of engineering machinery according to claim 1, characterized in that: The actuator lifting and moving device includes a first bushing, a lifting shaft, a first wheel axle, a first roller, a first disc spring, a first pressure block, a first adjusting bolt, and a first locking nut. The first bushing is fixedly connected to the upper pressure plate. The first bushing has a first threaded hole that mates with the first adjusting bolt. The lower end of the first threaded hole has a coaxial first layer hole, and the lower end of the first layer hole has a coaxial second layer hole. The first pressure block is fitted into the first layer hole. The first adjusting bolt is threaded into the first threaded hole, and its lower end rests on the upper surface of the first pressure block. The lifting shaft is fitted into the second layer hole. The first disc spring is located between the first pressure block and the lifting shaft and can elastically extend and retract within the first and second layer holes. The first locking nut is threaded to the outside of the first adjusting bolt and is located on the upper surface of the first bushing. The lower end of the lifting shaft has an opening groove that passes through the left and right sides. The two ends of the first wheel axle are fixedly connected to the front and rear side walls of the opening groove. The first roller is fitted into the middle of the first wheel axle and forms a rotatable connection with the first wheel axle.

3. The bending fatigue testing machine for a drive axle housing of engineering machinery according to claim 2, characterized in that: The actuator lifting and moving device also includes a first positioning screw. The outer side of the first bushing is provided with a first radial threaded hole in the middle. The outer side of the lifting shaft is provided with a first radial waist-shaped blind hole in the vertical direction at a position corresponding to the first radial threaded hole. The first positioning screw is threaded into the first radial threaded hole and its end is inserted into the first radial waist-shaped blind hole to orient the first roller to move up and down.

4. The bending fatigue testing machine for a drive axle housing of engineering machinery according to claim 1, characterized in that: The driving device includes a drive motor and a reducer, a gear and a rack. The drive motor and reducer are located on the left front side or the right front side of the upper pressure plate and are fixedly connected to the upper pressure plate through a motor bracket. The gear is located at the output shaft end of the reducer, and the rack is located at the upper end of the front side of the crossbeam and meshes with the gear for transmission.

5. The bending fatigue testing machine for a drive axle housing of engineering machinery according to claim 4, characterized in that: The speed reducer is a cycloidal pinwheel speed reducer.

6. The bending fatigue testing machine for a drive axle housing of engineering machinery according to claim 1, characterized in that: The support lifting and moving device includes a second bushing, a T-shaped lifting shaft, a second roller, a second disc spring, a second pressure block, a second adjusting bolt, and a second locking nut. The second bushing is fixedly connected to the middle of the outer flange at the lower end of the workpiece support. The second bushing has a second threaded hole that mates with the second adjusting bolt. The lower end of the second threaded hole has a coaxial third layer hole, and the lower end of the third layer hole has a coaxial fourth layer hole. The second pressure block is fitted into the third layer hole. The second adjusting bolt is threaded into the second threaded hole, and its lower end rests on the upper surface of the second pressure block. The upper end of the T-shaped lifting shaft is fitted into the fourth layer hole. The second disc spring is located between the second pressure block and the T-shaped lifting shaft and can elastically expand and contract within the third and fourth layer holes. The second locking nut is threaded to the outside of the second adjusting bolt and is located on the upper surface of the second bushing. The left and right ends of the lower horizontal shaft of the T-shaped lifting shaft are fitted with second rollers, and the second rollers are rotatably connected to the T-shaped lifting shaft. A horizontal rectangular groove is provided on the ground platform at the position corresponding to the lower horizontal axis of the T-shaped lifting shaft. The second rollers at the left and right ends of the T-shaped lifting shaft are located in the rectangular groove and can roll in a straight line along the rectangular groove during operation.

7. The bending fatigue testing machine for a drive axle housing of engineering machinery according to claim 6, characterized in that: The support lifting and moving device also includes a second positioning screw. The second bushing has a second radial threaded hole in the middle of its outer side. The T-shaped lifting shaft has a second radial waist-shaped blind hole in the vertical direction at the position corresponding to the second radial threaded hole on its outer side. The second positioning screw is threaded into the second radial threaded hole and its end is inserted into the second radial waist-shaped blind hole to orient the second roller to move up and down.

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