A steel plate spring fatigue testing machine

Abstract

The application relates to the technical field of fatigue testing machines, in particular to a steel plate spring fatigue testing machine, which comprises a platform, a fixing mechanism and a vertical force applying mechanism, the fixing mechanism is slidably arranged on the platform and used for fixing a steel plate spring, and the vertical force applying mechanism is arranged on the platform and used for applying a vertical force to the steel plate spring; a transverse force applying mechanism and a longitudinal force applying mechanism are arranged on the platform, the force applying direction of the transverse force applying mechanism is the same as the sliding direction of the fixing mechanism and the transverse force applying mechanism is used for applying a transverse force to the steel plate spring; and the force applying direction of the longitudinal force applying mechanism is perpendicular to the force applying directions of the vertical force applying mechanism and the transverse force applying mechanism. The application has the effect of improving the accuracy of fatigue test results.

Description

Technical Field

[0001] This application relates to the technical field of fatigue testing machinery, and in particular to a fatigue testing machine for steel leaf springs. Background Technology

[0002] Currently, leaf springs are widely used suspension elastic elements in traditional automobiles. Their advantages include simple structure, reliable operation, low cost, and easy maintenance. They serve as both the elastic element and the guiding device of the suspension. One end is hinged to the vehicle frame, transmitting various forces and torques and determining the wheel's trajectory. Simultaneously, they also possess a certain degree of frictional damping, making them widely used in non-independent suspensions. Therefore, the performance and quality of leaf springs, especially their fatigue life, directly affect vehicle operating safety.

[0003] In the prior art, Chinese Patent No. CN207351662U discloses a fatigue testing device for leaf springs, including a transmission device, a punch press platform, sliding components and leaf spring connecting plates respectively disposed at both ends of the punch press platform. The leaf spring to be tested is connected to the sliding components and leaf spring connecting plates respectively through the eyelet pins at both ends. The leaf spring connecting plate is rotatably connected to the punch press platform. The transmission device includes a transmission pressure head and a fixing component. The fixing component includes a connecting seat and a U-bolt. The leaf spring is fixed to the connecting seat by the U-bolt. The upper and lower ends of the transmission pressure head are respectively connected to a fatigue testing machine and the connecting seat. When conducting a fatigue test on the leaf spring, the leaf spring is fixed to the connecting seat by the U-bolt, and then pressure is applied to the connecting seat by the transmission pressure head to conduct the fatigue test.

[0004] In the process of developing this application, the inventors discovered that the technology has at least the following problems: when a car is driving and encounters uneven road sections, the leaf spring not only bears vertical force, but also lateral and axial forces. The test device cannot apply multi-directional forces to the leaf spring, which leads to inaccurate fatigue test results. Summary of the Invention

[0005] To improve the accuracy of fatigue test results, this application provides a fatigue testing machine for steel leaf springs.

[0006] This application provides a fatigue testing machine for leaf springs, which adopts the following technical solution: A fatigue testing machine for leaf springs includes a platform, a fixing mechanism, and a vertical force application mechanism. The fixing mechanism is slidably mounted on the platform for fixing the leaf spring, and the vertical force application mechanism is mounted on the platform for applying a vertical force to the leaf spring. The platform is provided with a transverse force application mechanism and a longitudinal force application mechanism. The force application direction of the transverse force application mechanism is the same as the sliding direction of the fixing mechanism and is used to apply a transverse force to the leaf spring. The force application direction of the longitudinal force application mechanism is perpendicular to the force application directions of the vertical force application mechanism and the transverse force application mechanism.

[0007] By adopting the above technical solution, when conducting fatigue tests on leaf springs, the leaf springs are first fixed using a fixing mechanism. Depending on the customer's testing requirements, a vertical force application mechanism, a longitudinal force application mechanism, and a transverse force application mechanism can be selectively chosen to apply force to the leaf springs, or all three can be applied simultaneously. By applying force to the leaf springs in three directions, the fatigue test of the leaf springs becomes more realistic, and the test results are more accurate.

[0008] Optionally, the fixing mechanism includes a sliding component and a fixing component. The fixing component includes a connecting seat, a pressure seat, and a clamping bolt. The pressure seat is located on the side of the connecting seat near the platform and is detachably connected to the connecting seat via the clamping bolt. The leaf spring is located between the connecting seat and the pressure seat, and the pressure seat presses the leaf spring against the connecting seat. The lateral force application mechanism, the vertical force application mechanism, and the longitudinal force application mechanism work together on the pressure seat. Two sets of sliding components are provided, both of which are slidably disposed on the platform. The two ends of the leaf spring are respectively fixed to the two sliding components.

[0009] By adopting the above technical solution, when testing leaf springs, the two ends of the leaf spring are first connected to two sets of sliding components. Then, the connecting seat and the pressure seat are respectively abutted against the leaf spring. Then, the clamping bolt is used to drive the connecting seat and the pressure seat to press against the leaf spring. Then, the vertical force application mechanism, the longitudinal force application mechanism, and the transverse force application mechanism are used to apply force to the pressure seat. The fixed mechanism facilitates three-way force application. At the same time, the three-way force does not act directly on the leaf spring, which can reduce the force deviation. The force is transmitted to the leaf spring through the connecting seat and the pressure seat, making the test results more accurate.

[0010] Optionally, the sliding assembly includes a slide rail, a seat, and rollers. Four rollers are rotatably mounted on the seat. The slide rail is laid on the platform, and the rollers are tactilely connected to the slide rail. A connecting groove is provided on the seat, and the leaf spring and its fixed shaft are located in the connecting groove. A limiting groove is provided on the seat, and the fixed shaft of the leaf spring is located in the limiting groove.

[0011] By adopting the above technical solution, the leaf spring deforms when subjected to vertical force, causing it to extend along its length and drive the seat and rollers to slide along the slide rail. The sliding component allows the leaf spring to extend laterally under force, reducing the direct force acting on a single point of the leaf spring and preventing overpressure damage. At the same time, it closely resembles the actual application environment, making the test results more accurate.

[0012] Optionally, the seat is provided with two sets of positioning components. The positioning components include an adjustment seat, a pin, and a positioning plate. The adjustment seat is disposed on the platform, and the positioning plate is disposed on the seat. The adjustment seat is detachably connected to the positioning plate through the pin.

[0013] By adopting the above technical solution, when a lateral force is applied to the leaf spring, the positioning plate on the seat is moved to the adjusting seat, and then the adjusting seat and the positioning plate are connected by a pin. Then, the lateral force application mechanism applies force to the pressure seat. The positioning component facilitates the application of lateral force to the leaf spring alone, and can also be used to facilitate the application of lateral force to the leaf spring during the vertical force application process.

[0014] Optionally, the adjusting seat is slidably disposed on the platform along the length direction of the slide rail, and the positioning assembly further includes a locking bolt, which passes through the adjusting seat and is connected to the platform.

[0015] By adopting the above technical solution, when the length of the leaf springs is different or the applied vertical force is different, the position of the adjusting seat can be adjusted by sliding, and then the position of the adjusting seat can be fixed by locking bolts. By sliding the adjusting seat, the positioning range of the positioning component is expanded, which facilitates the positioning and fixing of various leaf springs and improves the applicability of the equipment.

[0016] Optionally, a side-shifting groove is provided on the slide rail, and the side-shifting groove is provided along the length direction of the slide rail; a side-shifting limiting mechanism is provided on the roller, the side-shifting limiting mechanism includes a fixed plate and a limiting shaft, the fixed plate is provided on the seat, and the limiting shaft is provided on the fixed plate and slides along the side-shifting groove.

[0017] By adopting the above technical solution, when longitudinal force is applied, in order to facilitate the application of longitudinal force to the leaf spring, the limiting plate is installed on the seat and the limiting shaft is inserted into the side shift groove. When lateral force is applied, the longitudinal force is applied to the seat. The seat is connected to the slide rail through the limiting shaft, which reduces the longitudinal force that is not fully applied to the pressure seat due to the tilt of the seat, thereby making the fatigue test results of the leaf spring more accurate.

[0018] Optionally, the lateral displacement limiting mechanism further includes a limiting ring and limiting balls. The limiting ring is coaxially disposed on the roller, and a plurality of limiting balls are rotatably disposed on the limiting ring. The limiting balls abut against the side wall of the slide rail and rotate relative to each other.

[0019] By adopting the above technical solution, when the three forces are applied simultaneously, the limiting ring drives the limiting ball to press against the slide rail, and then the three forces are applied. Through the setting of the limiting ring and limiting ball, the longitudinal force pushes the seat to slide longitudinally, thereby making the application of the lateral force and the vertical force have an angle, resulting in force deviation and reducing the impact on the test results.

[0020] Optionally, the limiting ring is threaded to one end of the roller.

[0021] By adopting the above technical solution, when the three forces are applied simultaneously, the rotating limiting ring causes the limiting ring to drive the limiting ball to press against the slide rail. Then, the three forces are applied. Through the setting of the limiting ring and the limiting ball, the longitudinal force pushing the seat longitudinally slides is reduced, thereby making the application of the lateral and vertical forces at an angle, resulting in force deviation and reducing the impact on the test results. At the same time, the limiting ring is threaded to the roller. When no force is applied, the limiting ring can be rotated to drive the limiting ball away from the slide rail, which facilitates the adjustment of the seat position.

[0022] Optionally, the vertical force application mechanism includes an adjustment component and a force application component. The force application component includes a sliding seat and a first hydraulic cylinder. The sliding seat is slidably mounted on the platform via the adjustment component. The first hydraulic cylinder is mounted on the sliding seat and abuts against the pressure seat.

[0023] By adopting the above technical solution, when performing fatigue tests on different leaf springs, the position of the first hydraulic cylinder can be adjusted according to the center position of the leaf spring by adjusting the adjustment component. Then, the first hydraulic cylinder is used to apply force to the leaf spring. The adjustment component ensures that the force application position of the first hydraulic cylinder is always in the middle of the leaf spring, which facilitates the improvement of the accuracy of the test results. At the same time, it can apply force to different leaf springs, thus improving the applicability of the equipment.

[0024] Optionally, the force-applying component further includes a first ball joint and a second ball joint, wherein the first hydraulic cylinder is rotatably mounted on the sliding seat via the first ball joint, and the second ball joint is mounted on the piston rod of the first hydraulic cylinder and is detachably connected to the pressure seat.

[0025] By adopting the above technical solution, when applying triaxial or vertical force, the first hydraulic cylinder drives the second ball joint to apply force to the pressure seat. When there is a slight deviation in the vertical direction, the deviation of the force application can be reduced by the first and second ball joints, so that most of the force applied by the first hydraulic cylinder acts on the connecting seat and the pressure seat, thereby making the data recording and pressure results more accurate, and reducing the impact of triaxial force application, so that the three forces can act on the steel leaf spring together.

[0026] In summary, this application includes the following beneficial technical effects: 1. By applying force to the leaf spring in three directions, the fatigue test of the leaf spring is more realistic, and the test results of the leaf spring are more accurate; 2. When the lengths of the leaf springs are different, or the applied vertical forces are different, the position of the adjusting seat can be adjusted by sliding, and then the position of the adjusting seat can be fixed by locking bolts. By sliding the adjusting seat, the positioning range of the positioning component is expanded, which facilitates the positioning and fixing of various leaf springs and improves the applicability of the equipment. 3. When three forces are applied simultaneously, rotate the limiting ring so that the limiting ring drives the limiting ball to press against the slide rail. Then apply the three forces. Through the setting of the limiting ring and the limiting ball, the longitudinal force pushes the seat to slide longitudinally, thereby making the application of the lateral and vertical forces at an angle, resulting in force deviation and reducing the impact on the test results. At the same time, the limiting ring is threaded to the roller. When no force is applied, the limiting ring can be rotated to drive the limiting ball away from the slide rail, which facilitates the adjustment of the seat position. 4. When applying triaxial or vertical force, the first hydraulic cylinder drives the second ball joint to apply force to the connecting seat. When there is a slight deviation in the vertical direction, the first and second ball joints can reduce the deviation of the applied force, so that most of the force applied by the first hydraulic cylinder acts on the connecting seat and the pressure seat. This makes the data recording and pressure results more accurate, and also reduces the need for the three forces to act together on the leaf spring when applying triaxial force. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the leaf spring fatigue testing machine in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the adjustment component in an embodiment of this application; Figure 3 This is a schematic diagram of the transverse force application mechanism in the embodiments of this application; Figure 4 This is a schematic diagram of the positioning component in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the fixing component in an embodiment of this application; Figure 6 This is an exploded view of the limiting ring and roller in the embodiments of this application; Figure 7 This is a cross-sectional view of the limiting ring in an embodiment of this application; Figure 8 This is a schematic diagram of the longitudinal force application mechanism in the embodiments of this application.

[0028] Reference numerals: 100, platform; 110, first adjusting groove; 120, third sliding groove; 130, side shifting groove; 200, fixing mechanism; 210, sliding assembly; 211, slide rail; 212, seat; 213, roller; 215, connecting groove; 216, limiting groove; 217, connecting block; 218, adjusting block; 219, first sliding groove; 220, fixing assembly; 221, connecting seat; 222, pressure seat; 223, clamping bolt; 2 24. Compression nut; 230. Positioning assembly; 231. Adjusting seat; 232. Pin; 233. Positioning plate; 234. Locking bolt; 235. Locking nut; 236. Positioning seat; 237. First slider; 300. Vertical force application mechanism; 310. Adjusting assembly; 311. First sliding plate; 312. Second double-ended screw; 313. Second connecting nut; 320. Force application assembly; 321. Sliding seat; 322. First hydraulic cylinder; 323. First ball joint; 324. Second ball joint; 400. Lateral force application mechanism; 410. First force application seat; 411. Second slide groove; 420. Second slider; 440. Third ball joint; 450. Second hydraulic cylinder; 460. Fourth ball joint; 500. Longitudinal force application mechanism; 510. Second force application seat; 511. Fourth slide groove; 530. Fifth ball joint; 540. Third hydraulic cylinder; 550. Sixth ball joint; 600. Lateral displacement limiting mechanism ; 610, Fixed plate; 620, Limiting shaft; 630, Limiting ring; 640, Limiting ball; 650, Side-shifting ring; 660, Threaded ring; 670, Connecting ring; 671, Rotating groove; 700, Fixed frame; 710, Gantry frame; 720, Fixed beam; 730, Sliding beam; 740, Connecting assembly; 741, Connecting plate; 742, First double-ended screw; 743, First connecting nut; 810, Steel leaf spring; 820, Fixed shaft. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0030] This application discloses a fatigue testing machine for leaf springs.

[0031] refer to Figure 1A leaf spring fatigue testing machine includes a platform 100, a fixing frame 700 mounted on the platform 100, a vertical force-applying mechanism 300 mounted on the fixing frame 700 for applying vertical force to the leaf spring 810, a fixing mechanism 200 mounted on the platform 100 for fixing the leaf spring 810, a transverse force-applying mechanism 400 mounted on the platform 100 for applying force in the length direction of the leaf spring 810, and a transverse force-applying mechanism 400 mounted on the platform 100 for applying force in the width direction of the leaf spring 810. When conducting a fatigue test on the leaf spring 810, the leaf spring 810 is first fixed by the fixing mechanism 200, and then three forces are applied to the leaf spring 810 using the transverse force-applying mechanism 400, the longitudinal force-applying mechanism 500, and the vertical force-applying mechanism 300 to test the fatigue performance of the leaf spring 810.

[0032] refer to Figure 1 The fixed frame 700 includes two gantry frames 710 fixedly connected to the platform 100. The two gantry frames 710 are arranged in parallel and along the length of the platform 100. A fixed beam 720 is fixedly connected to one side of the two gantry frames 710. A sliding beam 730 is abutted on the side of the two gantry frames 710 near the platform 100. The sliding beam 730 can slide along the width of the gantry frame 710. A connecting component 740 is provided on the sliding beam 730. The connecting component 740 includes four connecting plates 741. The two ends of the sliding beam 730 correspond to the two connecting plates 741 respectively. The two connecting plates 741 at the same end abut against the side walls of the sliding beam 730 and the gantry frame 710 respectively. Four first double-ended screws 742 are passed through the two connecting plates 741. The two ends of the first double-ended screws 742 are threaded with first connecting nuts 743. The first connecting nuts 743 abut against the connecting plates 741.

[0033] refer to Figure 2 , Figure 3 and Figure 4The platform 100 has multiple first adjustment slots 110 along its length. The fixing mechanism 200 includes a sliding component 210, which includes two adjusting blocks 218 slidably connected in two of the adjustment slots. Each of the two adjusting blocks 218 is connected to a slide rail 211, and the two slide rails 211 are fixedly connected by a connecting block 217. Two seats 212 are commonly provided on the two slide rails 211, and four rollers 213 are rotatably connected to each seat 212. A connecting end is provided at the end of the seat 212 away from the platform 100. The leaf spring 810 has two ends located in the connecting grooves 215 of the two seats 212. The two ends of the leaf spring 810 are provided with fixed shafts 820. The seats 212 have two limiting grooves 216. The limiting grooves 216 are V-shaped and are located on both sides of the connecting grooves 215 and are connected to the connecting grooves 215. The fixed shafts 820 are located in the limiting grooves 216. The two side walls of the limiting grooves 216 are fixedly connected with limiting plates by bolts. The limiting plates are made of copper and abut against the fixed shafts 820.

[0034] refer to Figure 4 The connecting block 217 has two first sliding grooves 219, which are T-shaped grooves with their axes parallel to the axis of the slide rail 211. The connecting block 217 is equipped with two sets of positioning components 230, each including a first slider 237 that slides within the first sliding groove 219. An adjusting seat 231 is slidably connected to the side wall of the connecting block 217 away from the platform 100. The adjusting seat 231 is located on one side of the seat 212. The two first sliders 237 slide vertically onto the side wall of the adjusting seat 231 near the connecting block 217. A positioning seat 237 abuts against the side wall of the adjusting seat 231 away from the first sliders 237. 36. A locking bolt 234 is provided at the end of the first slider 237 away from the adjusting seat 231. The locking bolt 234 passes through the first slider 237, the adjusting seat 231 and the positioning seat 236 in sequence. A locking nut 235 is threaded to the end of the locking bolt 234 that passes through the positioning seat 236. The locking nut 235 and the locking bolt 234 drive the three to abut against each other. A slot is provided on the side wall of the positioning seat 236 near the seat 212. A positioning plate 233 is fixedly connected to the seat 212. The positioning plate 233 is inserted into the slot. A pin hole is coaxially provided on the positioning seat 236 and the positioning plate 233. A pin 232 is inserted into the pin hole.

[0035] refer to Figure 5A fixing component 220 is provided on the leaf spring 810. The fixing component 220 includes a connecting seat 221. The connecting seat 221 is located in the middle of the leaf spring 810 and on the side close to the platform 100. A pressure seat 222 is abutted on the side of the leaf spring 810 away from the connecting seat 221. Four clamping bolts 223 are provided on the connecting seat 221 and the pressure seat 222. The nuts of the clamping bolts 223 abut against the side wall of the connecting seat 221 away from the pressure seat 222. A clamping nut 224 is threaded on the clamping bolt 223. The clamping nut 224 abuts against the side wall of the pressure seat 222 away from the connecting seat 221.

[0036] refer to Figure 4 , Figure 6 and Figure 7 Side shift grooves 130 are formed on the sidewalls of the two slide rails 211 that are facing away from each other. The side shift grooves 130 are formed along the length of the slide rails 211. A side shift limiting mechanism 600 is provided on the seat 212. The side shift limiting mechanism 600 includes a fixing plate 610 fixedly connected to the seat 212. The fixing plate 610 extends to the side of the slide rail 211 away from the connecting block 217. A limiting shaft 620 passes through the fixing plate 610. The limiting shaft 620 can be inserted into the side shift groove 130 and slide along the side shift groove 130. When the seat 212 is subjected to lateral force, the limiting shaft 620 abuts against the sidewall of the side shift groove 130 to limit the tilting and flipping of the seat 212. A side shift ring 650 is integrally provided on the sidewalls of the two sets of rollers 213 on the two slide rails 211 that are close to each other. The side shift ring 650 is used to limit the rollers 213 from sliding. The guide rail 211 is disengaged; the ends of the two sets of rollers 213 facing away from each other are threadedly connected to a limiting ring 630, and the end of the limiting ring 630 away from the rollers 213 is fixedly connected to a connecting ring 670. The connecting ring 670 has a rotating groove 671 with a hexagonal cross-section for inserting a hexagonal wrench for rotation; multiple limiting balls 640 are rotatably connected to the side wall of the limiting ring 630 near the guide rail 211. The limiting balls 640 are evenly spaced along the circumference of the limiting ring 630 and can abut against the guide rail 211 and rotate relative to it; in order to enhance the stability of the limiting ring 630, threaded grooves are provided on the side walls of the two sets of rollers 213 facing away from each other. Threaded rings 660 are threadedly connected in the threaded grooves. The threaded rings 660 are fixedly connected to the connecting ring 670 and are concentric with the rotating grooves 671.

[0037] refer to Figure 2The vertical force application mechanism 300 includes an adjustment assembly 310, which includes two first sliding plates 311 located on both sides of the sliding beam 730. Two second double-ended screws 312 are provided on both sides of the sliding beam 730. The two ends of each second double-ended screw 312 pass through the two first sliding plates 311 and are threadedly connected to second connecting nuts 313. The sidewalls of the second connecting nuts 313 that are close to each other abut against the sidewalls of the two first sliding plates 311 that are far apart. A force application assembly 320 is provided on the first sliding plate 311 near the platform 100. The force application assembly 320 includes... The system includes a sliding seat 321 fixedly connected to a first sliding plate 311 near the platform 100. A first ball joint 323 is fixedly connected to the sliding seat 321 by bolts. A first hydraulic cylinder 322 is fixedly connected to the end of the first ball joint 323 away from the sliding seat 321. A second ball joint 324 is fixedly connected to the piston rod of the first hydraulic cylinder 322. The second ball joint 324 is detachably connected to the pressure seat 222 by bolts. The rotation directions of the first ball joint 323 and the second ball joint 324 are the same, and the rotation axes of the first ball joint 323 and the second ball joint 324 are parallel to the width direction of the platform 100.

[0038] refer to Figure 3 The transverse force application mechanism 400 includes a first force application seat 410 fixedly connected to one end of two slide rails 211. A second slide groove 411 is provided at the end of the first force application seat 410 near the slide rails 211. The second slide groove 411 is opened in the vertical direction. A second slider 420 is slidably connected in the second slide groove 411. A third ball joint 440 is fixedly connected at the end of the second slider 420 away from the first force application seat 410. A second hydraulic cylinder 450 is fixedly connected at the end of the third ball joint 440 away from the first adjusting seat. A fourth ball joint 460 is fixedly connected to the piston rod of the second hydraulic cylinder 450. The fourth ball joint 460 is detachably connected to the pressure seat 222 by bolts. The rotation directions of the third ball joint 440 and the fourth ball joint 460 are the same, and the rotation axes of the third ball joint 440 and the fourth ball joint 460 are parallel to the rotation axis of the first ball joint 323.

[0039] refer to Figure 3 and Figure 8The platform 100 has multiple third slide grooves 120 on its side away from the ground. These third slide grooves 120 extend along the width of the platform 100. The longitudinal force-applying mechanism 500 includes a third slider slidably connected within the third slide groove 120. A second force-applying seat 510 is fixedly connected to the third slider and is located on one side of the slide rail 211. A fourth slide groove 511 is formed on the side of the second force-applying seat 510 near the slide rail 211. The fourth slide groove 511 extends vertically and a slide is slidably within it. A fourth slider is connected to the sliding block. A fifth ball joint 530 is fixedly connected to the side wall of the fourth slider away from the second force-applying seat 510. A third hydraulic cylinder 540 is fixedly connected to the fifth ball joint 530. A sixth ball joint 550 is fixedly connected to the piston rod of the third hydraulic cylinder 540. The sixth ball joint 550 is detachably connected to the pressure seat 222 by bolts. The fifth ball joint 530 and the sixth ball joint 550 rotate in the same direction, and the rotation axes of the fifth ball joint 530 and the sixth ball joint 550 are parallel to the length direction of the platform 100.

[0040] The implementation principle of a leaf spring fatigue testing machine according to an embodiment of this application is as follows: When conducting a fatigue test on a leaf spring 810, firstly, according to the position of the leaf spring 810, the first force-applying seat 410 and the second force-applying seat 510 are fixed. Then, the two ends of the leaf spring 810 are respectively clamped into the connecting groove 215 through the fixing shaft 820. Then, the connecting plate 741 is placed on both sides of the middle part of the leaf spring 810, and then fixed on the leaf spring 810 with the first double-ended bolt and the first connecting nut 743. Then, adjust... The position of the first sliding plate 311 is such that the first hydraulic cylinder 322 is located above the middle of the leaf spring 810; then the second ball joint 324 is connected to the pressure seat 222, and then the fourth ball joint 460 and the sixth ball joint 550 are respectively connected to the pressure seat 222 by bolts; then the limiting shaft 620 is inserted into the side shift groove 130, and the limiting ring 630 is rotated, and the limiting ring 630 drives the limiting ball 640 to press against the slide rail 211; then the forces in three directions are applied to the pressure seat 222 to conduct a triaxial fatigue test.

[0041] When applying unidirectional force, the connection between the force application mechanism in other directions and the pressure seat 222 can be removed as needed, and then the unidirectional force can be applied to complete the fatigue test.

[0042] When applying a lateral force, the adjusting seat 231 can be fixed, the positioning plate 233 can be inserted into the slot, and then fixed with the pin 232 to apply the lateral force.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fatigue testing machine for leaf springs, comprising a platform (100), a fixing mechanism (200), and a vertical force application mechanism (300), wherein the fixing mechanism (200) is slidably disposed on the platform (100) for fixing a leaf spring (810), and the vertical force application mechanism (300) is disposed on the platform (100) for applying a vertical force to the leaf spring (810); characterized in that, The platform (100) is provided with a transverse force-applying mechanism (400) and a longitudinal force-applying mechanism (500). The force-applying direction of the transverse force-applying mechanism (400) is the same as the sliding direction of the fixing mechanism (200) and is used to apply a transverse force to the leaf spring (810). The force-applying direction of the longitudinal force-applying mechanism (500) is perpendicular to the force-applying direction of the vertical force-applying mechanism (300) and the force-applying direction of the transverse force-applying mechanism (400). The fixing mechanism (200) includes a sliding assembly (210) and a fixing assembly (220). The fixing assembly (220) includes a connecting seat (221), a pressure seat (222), and a clamping bolt (223). The pressure seat (222) is located on the side of the connecting seat (221) near the platform (100) and is detachably connected to the connecting seat (221) via the clamping bolt (223). A leaf spring (810) is located between the connecting seat (221) and the pressure seat (222). Between 222), the pressure seat (222) presses the leaf spring (810) against the connecting seat (221), and the transverse force application mechanism (400), the vertical force application mechanism (300) and the longitudinal force application mechanism (500) work together on the pressure seat (222); the sliding assembly (210) is provided in two sets and is slidably disposed on the platform (100), and the two ends of the leaf spring (810) are respectively fixed on the two sliding assemblies (210); The sliding assembly (210) includes a slide rail (211), a seat (212), and rollers (213). Four rollers (213) are rotatably mounted on the seat (212). The slide rail (211) is laid on the platform (100). The rollers (213) are rotatably connected to the slide rail (211). A connecting groove (215) is provided on the seat (212). The leaf spring (810) and its fixed shaft (820) are both located in the connecting groove (215). A limiting groove (216) is provided on the seat (212). The fixed shaft (820) of the leaf spring (810) is located in the limiting groove (216). The slide rail (211) is provided with a side shift groove (130), which is opened along the length direction of the slide rail (211); the roller (213) is provided with a side shift limiting mechanism (600), which includes a fixed plate (610) and a limiting shaft (620). The fixed plate (610) is provided on the seat (212), and the limiting shaft (620) is provided on the fixed plate (610) and slides along the side shift groove (130).

2. The leaf spring fatigue testing machine according to claim 1, characterized in that, The seat (212) is provided with two sets of positioning components (230). The positioning components (230) include an adjustment seat (231), a pin (232) and a positioning plate (233). The adjustment seat (231) is provided on the platform (100), and the positioning plate (233) is provided on the seat (212). The adjustment seat (231) is detachably connected to the positioning plate (233) through the pin (232).

3. The leaf spring fatigue testing machine according to claim 2, characterized in that, The adjusting seat (231) is slidably disposed on the platform (100) along the length direction of the slide rail (211). The positioning assembly (230) also includes a locking bolt (234), which passes through the adjusting seat (231) and is connected to the platform (100).

4. The leaf spring fatigue testing machine according to claim 1, characterized in that, The lateral displacement limiting mechanism (600) further includes a limiting ring (630) and limiting balls (640). The limiting ring (630) is coaxially disposed on the roller (213). A plurality of limiting balls (640) are rotatably disposed on the limiting ring (630). The limiting balls (640) abut against the side wall of the slide rail (211) and rotate relative to each other.

5. The leaf spring fatigue testing machine according to claim 4, characterized in that, The limiting ring (630) is threaded to one end of the roller (213).

6. The leaf spring fatigue testing machine according to claim 1, characterized in that, The vertical force application mechanism (300) includes an adjustment component (310) and a force application component (320). The force application component (320) includes a sliding seat (321) and a first hydraulic cylinder (322). The sliding seat (321) is slidably mounted on the platform (100) via the adjustment component (310). The first hydraulic cylinder (322) is mounted on the sliding seat (321) and abuts against the pressure seat (222).

7. The leaf spring fatigue testing machine according to claim 6, characterized in that, The force application component (320) further includes a first ball joint (323) and a second ball joint (324). The first hydraulic cylinder (322) is rotatably mounted on the sliding seat (321) via the first ball joint (323). The second ball joint (324) is mounted on the piston rod of the first hydraulic cylinder (322) and is detachably connected to the pressure seat (222).

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