Fatigue test device for axle production

Abstract

The invention relates to the technical field of fatigue testing, and discloses a fatigue experiment device for axle production, which comprises two racks, an annular chain conveying piece is arranged between the two racks, lifting cushion tables are arranged on the surface of the annular chain conveying piece in an array manner, a supporting assembly is slidably connected to the racks, and the supporting assembly is provided with a plurality of clamping grooves. An intermittent rotating assembly is fixedly installed at the right end of the annular chain conveying piece, a reciprocating moving assembly is arranged between the left side of the intermittent rotating assembly and the supporting assembly, an arch-shaped frame is fixedly installed between the tops of the two racks, and two axle suspension assemblies are fixedly installed on the top wall of the arch-shaped frame. The sliding frame is stably supported through the wave part, the cushion platform body is prevented from falling during wheel collision, a firm bumpy road surface is simulated, and therefore the chain body rotates anticlockwise, the relative positions of the wave part and the axle are continuously switched, the bumpy road surface is continuously simulated, long-time detection of the axle is facilitated, and the fatigue limit of the axle is conveniently measured.

Description

Technical Field

[0001] The present invention relates to the technical field of fatigue testing, and specifically to a fatigue testing device for axle production. Background Art

[0002] An automotive axle (also known as a car axle) is connected to the vehicle frame (or a unitized body) through a suspension, and wheels are installed at both ends thereof. The function of the axle is to bear the load of the vehicle and maintain the normal driving of the vehicle on the road. Therefore, after the axle is processed, it is necessary to detect its fatigue limit in order to understand the service life of the axle.

[0003] A Chinese patent with an application date of April 14, 2023 and a publication number of CN116399683A discloses a fatigue testing device for axle production, which relates to the technical field of axle side view. It includes a test bench, on the top of which an axle fastening mechanism is installed. The bottom of the axle fastening mechanism is connected to an automotive axle. At the inner bottom position of the test bench, a fatigue testing mechanism is installed. The fatigue testing mechanism provides an uneven rolling environment for the automotive axle through air pressure; through the provided fatigue testing mechanism, the adjustment cavity and the lifting seat inside the fatigue testing mechanism cooperate with each other to simulate the bumps and grooves on the road surface. The air pump can inflate the adjustment cavity through an air pipe to form a high-pressure environment inside the adjustment cavity. The air inside the adjustment cavity can then be discharged through the air outlet to restore the adjustment cavity to the normal pressure state, thus realizing the simulation of a complex road surface and ensuring the accuracy of experimental parameters, which has an accurate reference value for the service life of automotive axles.

[0004] However, in this technical solution, the axle is only supported from the upper side by a buffer spring. When the axle is impacted, the buffer spring is prone to continuous vibration, causing the axle to move up and down continuously, thus causing the axle to continuously hit the electric wheel. Since the lifting seat is driven by air pressure to move up and down, under the impact of the axle, the lifting seat will move downward to compress the air inside the adjustment cavity, and the lifting seat will move slightly downward, making it difficult to simulate the load on the axle when the vehicle passes through a solid and bumpy road surface, so further improvement can be made. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a fatigue testing device for axle production, which has the advantages of a relatively solid simulated bumpy road surface and reliable test results, and solves the problem that the electric wheel driven by air pressure is prone to move under impact, resulting in the simulation effect deviating from the actual road surface conditions.

[0007] (II) Technical Solutions

[0008] To achieve the purpose that the simulated bumpy road surface is relatively firm and the detection results are reliable, the present invention provides the following technical solutions: A fatigue test device for axle production, comprising two frames. An annular chain conveyor is arranged between the two frames. Lifting pads are arranged in an array on the surface of the annular chain conveyor. A support assembly is slidably connected to the frame. An intermittent rotation assembly is fixedly installed at the right end of the annular chain conveyor. A reciprocating movement assembly is arranged between the left side of the intermittent rotation assembly and the support assembly. Limiting assemblies are arranged at the bottoms of the front and rear ends of the support assembly; An arch frame is fixedly installed between the tops of the two frames. The arch frame is located directly above the support assembly. Two sets of axle suspension assemblies are fixedly installed on the top wall of the arch frame.

[0009] Preferably, the annular chain conveyor includes a driving shaft and a driven shaft. The driving shaft is rotatably connected between the left ends of the two frames. The driven shaft is rotatably connected between the right ends of the two frames. Two driving sprockets are fixedly installed on the surface of the driving shaft. Two driven sprockets are fixedly installed on the surface of the driven shaft; The annular chain conveyor further includes two chain bodies. The two chain bodies are distributed front and back. Each chain body is connected between the driving sprocket and the driven sprocket.

[0010] Preferably, each set of lifting pads includes a mounting seat. The mounting seat is fixedly installed on the outer link plate of the chain body. Three sliding holes are penetrated through the surface of the mounting seat. A sliding frame is slidably connected through the sliding holes. The sliding frame is in a "mountain" shape. A pad body is fixedly installed on the top of the sliding frame. The top of the pad body is an arc surface.

[0011] Preferably, the support assembly includes a bearing plate. A wave portion is arranged on the top of the bearing plate. The wave portion is in a wave shape. An inclined portion is arranged on the top of the right end of the bearing plate. Two sliding rods are fixedly installed on the front and rear sides of the bearing plate. A sliding seat is fixedly installed at one end of the two sliding rods away from the bearing plate. A sliding groove is penetrated through the frame. The sliding rod is slidably connected in the sliding groove. The sliding seat is attached to the surface of the frame.

[0012] Preferably, the intermittent rotation assembly includes two gears one respectively fixedly installed at both ends of the driven shaft. A gear two is meshed on the left side of the gear one. The diameter of the gear two is smaller than the diameter of the gear one. A rotating arm one is coaxially fixed on the side of the gear two close to the frame. A push column one is fixedly installed at one end of the rotating arm one away from the gear two. A turntable is arranged on the left side of the gear two. The turntable is attached to the side of the rotating arm one away from the frame. Linear slots are penetrated through the turntable in an array. The linear slots penetrate to the edge of the turntable. During the rotation of the rotating arm one, the push column one is inserted into the linear slot.

[0013] Preferably, each reciprocating movement component includes two connecting rods. A support is fixedly installed on the frame. The connecting rods are slidably connected to the support. A connecting plate is fixedly installed at the left end of the connecting rod. The connecting plate is fixedly installed on the sliding seat. A frame-shaped plate is fixedly installed at the right end of the connecting rod. A second rotating arm is fixedly installed at the center of the turntable. A second push column is fixedly installed on the side of the second rotating arm away from the turntable. The second push column is slidably connected within the frame-shaped plate.

[0014] Preferably, the limiting component includes a cross bar fixedly installed on the frame. The cross bar is located directly below the sliding groove. Limiting teeth are arranged in an array on the top of the cross bar. A covering cylinder is fixedly installed on the left side of the connecting plate. A first spring is fixedly installed on the top wall of the covering cylinder. A limiting column is fixedly installed at the bottom end of the first spring. The limiting column passes through and is slidably connected to the bottom end of the covering cylinder. The bottom end of the limiting column is hemispherical. The bottom end of the limiting column fits against the opposite sides of two adjacent limiting teeth.

[0015] Preferably, each axle suspension component includes a hydraulic damper and a U-shaped plate fixedly installed on the top wall of the arched frame. A hanging plate is fixedly installed at the bottom of the hydraulic damper. A vertical rod is fixedly installed on the top of the hanging plate. The vertical rod passes through and is slidably connected to the middle of the U-shaped plate. A deflecting plate is rotatably connected to the vertical part of the hanging plate. A C-shaped plate is fixedly installed at the bottom end of the deflecting plate. The opening of the C-shaped plate faces to the right. An extension plate is fixedly installed at the bottom end of the C-shaped plate. Two clamping columns are fixedly installed on the right side of the extension plate. A blocking piece is fixedly installed at the right end of the clamping column; A clamping plate is slidably connected to the right side of the deflecting plate. A bolt is threadedly connected to the middle of the clamping plate. Two card slots are formed through the bottom of the clamping plate.

[0016] Preferably, the hydraulic damper includes a base fixedly installed on the top wall of the arched frame. A hydraulic cylinder is fixedly installed at the bottom of the base. The hydraulic cylinder is filled with hydraulic oil. A piston rod passes through and is slidably connected to the bottom end of the hydraulic cylinder. A tray is fixedly installed on the surface of the piston rod. The tray is located below the bottom end of the hydraulic cylinder. A second spring is fixedly installed between the base and the tray. A stepped piston plate is fixedly installed at the top end of the piston rod. The diameter of the stepped piston plate is smaller than the inner diameter of the hydraulic cylinder.

[0017] Preferably, the cross section of the stepped piston plate is in a "convex" shape. A diversion cone block is fixedly installed at the bottom of the stepped piston plate. A funnel part is arranged at the bottom of the hydraulic cylinder; A sliding ring is slidably connected within the hydraulic cylinder. The outer diameter of the sliding ring is equal to the inner diameter of the hydraulic cylinder. The inner diameter of the sliding ring is equal to the diameter of the upper half of the stepped piston plate. Oil passing holes are formed through the sliding ring in an array.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a fatigue test device for axle production, which has the following beneficial effects:

[0020] 1. In the fatigue test device for axle production, during the counterclockwise movement of the chain body, the driven sprocket and the driven shaft are driven to rotate, thereby driving the first gear to rotate, driving the second gear and the first swing arm to rotate, and the first push rod makes a circular motion. During the movement of the first push rod, it first inserts into the linear groove to push the turntable to rotate, and then separates from the linear groove, thereby driving the turntable to rotate intermittently; the turntable drives the second swing arm to rotate intermittently, and the second push rod makes an intermittent circular movement, thereby driving the frame-shaped plate, the connecting rod, the connecting plate and the sliding seat to move intermittently. Then, through the connection of the sliding rod, the bearing plate moves intermittently, so as to switch the relative position of the wave part and the axle, so that before and after the wave part moves, the height of the pad body under the axle changes successively, applying different impacts to the wheels, simulating the impact on the axle when the wheels are on a bumpy road surface; and the wave part stably supports the sliding frame to prevent the pad body from descending when the wheel impacts, simulating a solid bumpy road surface. Thus, by rotating the chain body counterclockwise, the relative position of the wave part and the axle is continuously switched, continuously simulating a bumpy road surface, which is convenient for long-term detection of the axle in order to measure the fatigue limit of the axle;

[0021] 2. In the fatigue test device for axle production, the axle with wheels installed is placed on the top of the right end of the annular chain conveyor, and the pad body bears the wheels. The driving motor drives the driving shaft to rotate, so that the chain body moves counterclockwise, and the axle moves from right to left. Through the cooperation of the experimenter, the axle is clamped into the C-shaped plate. Then, the clamping plate is pushed downward, so that the clamping column is inserted into the card slot, and then the bolt is screwed, so that the end of the bolt presses against the right side of the axle, thereby fixing the axle inside the C-shaped plate; thus, the purpose of facilitating the installation of the axle before the experiment is achieved;

[0022] 3. When the wheel moves upward under the impact of the pad body, the hanging plate, the piston rod and the tray move upward, and the second spring is compressed and contracted. The stepped piston plate first inserts into the sliding ring, and then the stepped piston plate and the sliding ring move upward together. The hydraulic oil flows through the oil hole. By applying resistance to the stepped piston plate and the sliding ring through the hydraulic oil, the kinetic energy of the wheel moving upward is absorbed, so that the wheel rises slowly, enabling the axle to fully receive the impact load of the pad body; when the wheel descends, the second spring applies a downward thrust to assist the wheel in descending. The stepped piston plate first separates from the sliding ring, and then continues to move downward. The hydraulic oil flows through the annular channel between the stepped piston plate and the hydraulic cylinder, and with the guiding effect of the guiding cone block, the resistance received by the stepped piston plate when moving downward is small, so that the resistance of the wheel when moving downward is small. After the wheel is lifted by the previous pad body, it can quickly descend and contact the next pad body. Thus, a stable load is provided for the axle, and the experimental results are reliable. Brief Description of the Drawings

[0023] Figure 1 Schematic perspective view of a fatigue test device for axle production proposed by the present invention;

[0024] Figure 2 Schematic perspective view of the frame and the endless chain conveyor of a fatigue test device for axle production proposed by the present invention;

[0025] Figure 3 Schematic front sectional view of the endless chain conveyor and the support assembly of a fatigue test device for axle production proposed by the present invention;

[0026] Figure 4 Schematic perspective view of the lifting pad of a fatigue test device for axle production proposed by the present invention;

[0027] Figure 5 Schematic front view of a fatigue test device for axle production proposed by the present invention after removing the arched frame and the axle suspension assembly;

[0028] Figure 6 Schematic perspective view of the support assembly and the reciprocating movement assembly of a fatigue test device for axle production proposed by the present invention;

[0029] Figure 7 Schematic perspective view of the intermittent rotation assembly of a fatigue test device for axle production proposed by the present invention;

[0030] Figure 8 Schematic perspective view of the limit assembly of a fatigue test device for axle production proposed by the present invention;

[0031] Figure 9 Schematic perspective view of the arched frame and the axle suspension assembly of a fatigue test device for axle production proposed by the present invention;

[0032] Figure 10 Schematic perspective view of the axle suspension assembly of a fatigue test device for axle production proposed by the present invention;

[0033] Figure 11 Schematic sectional view of the hydraulic damper of a fatigue test device for axle production proposed by the present invention.

[0034] In the figure: 100, frame; 200, endless chain conveyor; 300, lifting pad; 400, support assembly; 500, intermittent rotation assembly; 600, reciprocating movement assembly; 700, limit assembly; 800, arched frame; 900, axle suspension assembly;

[0035] 101, chute; 201, drive shaft; 202, driven shaft; 203, driving sprocket; 204, driven sprocket; 205, chain body; 301, mounting seat; 302, sliding hole; 303, sliding frame; 304, pad body;

[0036] 401, bearing plate; 402, wave portion; 403, inclined portion; 404, slide bar; 405, slide seat; 501, gear one; 502, gear two; 503, swing arm one; 504, push column one; 505, turntable; 506, linear groove;

[0037] 601, connecting rod; 602, support; 603, connecting plate; 604, frame-shaped plate; 605, swing arm two; 606, push column two;

[0038] 701, cross bar; 702, limiting teeth; 703, covering cylinder; 704, spring one; 705, limiting column;

[0039] 901, hydraulic damper; 902, hanging plate; 903, vertical rod; 904, U-shaped plate; 905, deflecting plate; 906, C-shaped plate; 907, extension plate; 908, clamping post; 909, blocking piece; 910, clamping plate; 911, bolt; 912, card slot;

[0040] 9011, base; 9012, hydraulic cylinder; 9013, piston rod; 9014, tray; 9015, spring two; 9016, flow guiding cone; 9017, stepped piston plate; 9018, sliding ring; 9019, oil passing hole. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figure 1, A fatigue test device for axle production, comprising two frames 100. An annular chain conveyor 200 is arranged between the two frames 100. Lifting pads 300 are arranged in an array on the surface of the annular chain conveyor 200. A support assembly 400 is slidably connected to the frame 100. An intermittent rotation assembly 500 is fixedly installed at the right end of the annular chain conveyor 200. A reciprocating movement assembly 600 is arranged between the left side of the intermittent rotation assembly 500 and the support assembly 400. Limit assemblies 700 are arranged at the bottoms of the front and rear ends of the support assembly 400; An arch frame 800 is fixedly installed between the tops of the two frames 100. The arch frame 800 is located directly above the support assembly 400. Two sets of axle suspension assemblies 900 are fixedly installed on the top wall of the arch frame 800.

[0043] Please refer to Figure 2 , The annular chain conveyor 200 includes a drive shaft 201 and a driven shaft 202. The drive shaft 201 is rotatably connected between the left ends of the two frames 100. The driven shaft 202 is rotatably connected between the right ends of the two frames 100. A drive motor is connected to the rear end of the drive shaft 201 to drive the drive shaft 201 to rotate counterclockwise. Two drive sprockets 203 are fixedly installed on the surface of the drive shaft 201. Two driven sprockets 204 are fixedly installed on the surface of the driven shaft 202; The annular chain conveyor 200 further includes two chain bodies 205. The two chain bodies 205 are distributed front and rear. Each chain body 205 is connected between the drive sprocket 203 and the driven sprocket 204.

[0044] Please refer to Figures 3 - 4 , Each set of lifting pads 300 includes a mounting base 301. The mounting base 301 is fixedly installed on the outer link plate of the chain body 205 to prevent the mounting base 301 from deflecting relative to the chain body 205. Three sliding holes 302 are penetrated through the surface of the mounting base 301. A sliding frame 303 is penetrated and slidably connected in the sliding hole 302. The sliding frame 303 is in a "mountain" shape. A pad body 304 is fixedly installed on the top of the sliding frame 303. The top of the pad body 304 is an arc surface. Thus, by sliding the sliding frame 303 in the sliding hole 302, the pad body 304 can be lifted and lowered relative to the mounting base 301. During the experiment, the axle is fixed to the bottoms of the two axle suspension assemblies 900, and tires are installed on the axle for the experiment; In this embodiment, the length of the pad body 304 is greater than the length of the axle, and the two tires on the axle are both in contact with the pad body 304. When the pad body 304 is lifted and lowered, the two tires are lifted and lowered together. As a parallel embodiment, the length of the pad body 304 can be less than the length of the axle, and only one of the tires on the axle is in contact with the pad body 304, so that there is a difference in the amplitude when the tires at both ends of the axle are lifted and lowered.

[0045] Please refer to Figure 3 and Figures 5 - 6The support assembly 400 includes a carrier plate 401, with a wavy portion 402 disposed on top. The wavy portion 402 is wavy in shape, and an inclined portion 403 is disposed on the top right end of the carrier plate 401. The lowest point of the sliding frame 303 located above the chain body 205 is higher than the right end of the inclined portion 403. Therefore, when the chain body 205 moves counterclockwise, the sliding frame 303 can smoothly move to the upper side of the inclined portion 403. After passing through the inclined portion 403, the sliding frame 303 can slide along the wavy portion 402. The wave portion 402 has different peak heights and trough heights. When the sliding frame 303 passes through the wavy portion 402, the height of the pad body 304 changes accordingly.

[0046] Two slide bars 404 are fixedly mounted on the front and rear sides of the support plate 401. A slide seat 405 is fixedly mounted on the end of each slide bar 404 away from the support plate 401. A slide slot 101 is provided through the frame 100. The slide bars 404 slide within the slot 101, and the slide seat 405 adheres to the surface of the frame 100. As the slide bars 404 slide along the slot 101, the position of the top of the wave portion 402 relative to the axle changes, meaning that the height of the support body 304 changes when it moves to the bottom of the wheel. The difference in height between the support body 304 at the bottom of the wheel before the support plate 401 moves and the support body 304 at the bottom of the wheel after the support plate 401 moves creates a height difference, causing the wheel to rise and fall, simulating a bumpy road.

[0047] See also Figures 5 - 7 The intermittent rotation assembly 500 includes two gears 501 fixedly mounted on either end of the driven shaft 202. Gear 502 meshes with gear 502 on the left side of gear 1 501. Gear 502 has a smaller diameter than gear 1 501, resulting in a higher angular velocity for gear 502 than for gear 1 501. A rotating arm 503 is coaxially fixed to the side of gear 502 closest to the frame 100, rotating together with gear 502.

[0048] A push post 504 is fixedly mounted on the end of the rotating arm 503 away from the gear 2 502, causing the push post 504 to move in a circular motion. A turntable 505 is provided on the left side of the gear 2 502, affixed to the side of the rotating arm 503 away from the frame 100. A linear slot 506 is formed in the turntable 505, extending to the edge of the turntable 505. As the rotating arm 503 rotates, the push post 504 enters the linear slot 506, driving the turntable 505 to rotate. The push post 504 then slides out of the linear slot 506, continuing to rotate with the rotating arm 503 while the turntable 505 stops rotating. This causes the turntable 505 to rotate intermittently.

[0049] See also Figures 5 - 7, each reciprocating movement component 600 includes two connecting rods 601. A support 602 is fixedly installed on the frame 100. The connecting rod 601 is slidably connected to the support 602. A connecting plate 603 is fixedly installed at the left end of the connecting rod 601, and the connecting plate 603 is fixedly installed on the sliding seat 405.

[0050] A frame-shaped plate 604 is fixedly installed at the right end of the connecting rod 601. A second rotating arm 605 is fixedly installed at the center of the turntable 505. A second push column 606 is fixedly installed on the side of the second rotating arm 605 away from the turntable 505. The second push column 606 is slidably connected inside the frame-shaped plate 604. The length of the frame-shaped plate 604 is greater than the length of the second rotating arm 605. When the turntable 505 rotates, the second rotating arm 605 rotates synchronously. While the second push column 606 slides inside the frame-shaped plate 604, it drives the frame-shaped plate 604, the connecting rod 601, and the connecting plate 603 to move in the left-right direction. And when the second rotating arm 605 rotates one circle, the frame-shaped plate 604, the connecting rod 601, and the connecting plate 603 make a left-right reciprocating movement once, thereby driving the bearing plate 401 to make a left-right reciprocating movement once. And through the intermittent rotation of the turntable 505, the connecting rod 601 intermittently moves.

[0051] Please refer to Figure 8 , the limiting component 700 includes a cross bar 701 fixedly installed on the frame 100. The cross bar 701 is located directly below the sliding groove 101. Limiting teeth 702 are arranged in an array on the top of the cross bar 701. A covering cylinder 703 is fixedly installed on the left side of the connecting plate 603. A first spring 704 is fixedly installed on the top wall of the covering cylinder 703. A limiting column 705 is fixedly installed at the bottom end of the first spring 704. The limiting column 705 is slidably connected through the bottom end of the covering cylinder 703. The bottom end of the limiting column 705 is hemispherical, and the bottom end of the limiting column705 fits against the opposite sides of two adjacent limiting teeth 702. Through the elasticity of the first spring 704, the extrusion force between the limiting column 705 and the cross bar 701 is ensured. And the limiting teeth 702 block the limiting column 705 to inhibit the limiting column 705 from moving in the left-right direction. Since the connecting rod 601 and the connecting plate 603 move intermittently, when the connecting rod 601 and the connecting plate 603 stop moving, through the setting of the limiting teeth 702, the limiting column 705 can be kept in the current position, so that the connecting plate 603 and the sliding seat 405 are stably set in the current position, preventing the bearing plate 401 from continuing to move under the action of inertia. And preventing the bearing plate 401 from moving when the sliding frame 303 moves and impacts the inclined part 403.

[0052] Please refer to Figures 9 - 10, each axle suspension assembly 900 includes a hydraulic damper 901 and a U-shaped plate 904 fixedly installed on the top wall of the arch frame 800. A hanging plate 902 is fixedly installed at the bottom of the hydraulic damper 901, and the hanging plate 902 is in an inverted L shape. A vertical rod 903 is fixedly installed at the top of the hanging plate 902, and the vertical rod 903 is slidably connected through the middle of the U-shaped plate 904. Thus, through the cooperation of the vertical rod 903 and the U-shaped plate 904, the moving path of the hanging plate 902 is guided.

[0053] A deflection plate 905 is rotatably connected to the vertical part of the hanging plate 902. A C-shaped plate 906 is fixedly installed at the bottom end of the deflection plate 905, and the opening of the C-shaped plate 906 faces to the right. Before the experiment, the axle with wheels installed can be placed on the top of the right end of the annular chain conveyor 200. The axle is supported by the lifting pad 300, and then the annular chain conveyor 200 drives the axle to move from right to left, so that the axle is clamped into the opening of the C-shaped plate 906.

[0054] An extension plate 907 is fixedly installed at the bottom end of the C-shaped plate 906. Two clamping posts 908 are fixedly installed on the right side of the extension plate 907, and a blocking piece 909 is fixedly installed at the right end of the clamping post 908. A clamping plate 910 is slidably connected to the right side of the deflection plate 905. A bolt 911 is threadedly connected to the middle of the clamping plate 910, and two clamping slots 912 are formed through the bottom of the clamping plate 910. By manually pushing the clamping plate 910 downward, the clamping post 908 is clamped into the clamping slot 912, and then the bolt 911 is screwed, so that the end of the bolt 911 presses against the right side of the axle, and the blocking piece 909 blocks the clamping plate 910. Thus, the C-shaped plate 906 and the bolt 911 clamp and fix the axle. When the tires at both ends of the axle are uniformly impacted upward, the hanging plate 902 moves upward, the hydraulic damper 901 is squeezed, and the vertical rod 903 slides relative to the U-shaped plate 904. When the two wheels are impacted differently, the axle will be cleaned, the deflection plate 905 will deflect relative to the hanging plate 902, and the hanging plate 902 will move upward and squeeze the hydraulic damper 901.

[0055] Please refer to Figures 9 - 10, the hydraulic damping member 901 includes a base 9011 fixedly installed on the top wall of the arched frame 800. A hydraulic cylinder 9012 is fixedly installed at the bottom of the base 9011. The hydraulic cylinder 9012 is filled with hydraulic oil. A piston rod 9013 is slidably connected through the bottom end of the hydraulic cylinder 9012. A tray 9014 is fixedly installed on the surface of the piston rod 9013. The tray 9014 is located below the bottom end of the hydraulic cylinder 9012. A second spring 9015 is fixedly installed between the base 9011 and the tray 9014. A stepped piston plate 9017 is fixedly installed at the top end of the piston rod 9013. The diameter of the stepped piston plate 9017 is smaller than the inner diameter of the hydraulic cylinder 9012. When the wheel is impacted, the axle moves upward, driving the suspension plate 902 upward. The piston rod 9013 and the tray 9014 move upward, and the second spring 9015 is compressed and contracted. At the same time, the stepped piston plate 9017 slides within the hydraulic cylinder 9012, and the hydraulic oil flows through the annular channel between the stepped piston plate 9017 and the side wall of the hydraulic cylinder 9012. The kinetic energy of the axle is absorbed by the resistance exerted by the hydraulic oil on the stepped piston plate 9017, thereby cushioning and damping the axle.

[0056] The cross-section of the stepped piston plate 9017 is in a "convex" shape. A flow guiding cone 9016 is fixedly installed at the bottom of the stepped piston plate 9017. A funnel part is provided at the bottom of the hydraulic cylinder 9012. A sliding ring 9018 is slidably connected within the hydraulic cylinder 9012. The outer diameter of the sliding ring 9018 is equal to the inner diameter of the hydraulic cylinder 9012, and the inner diameter of the sliding ring 9018 is equal to the diameter of the upper half of the stepped piston plate 9017. Oil passing holes 9019 are arrayed and drilled through the sliding ring 9018. When the stepped piston plate 9017 moves upward, the sliding ring 9018 sleeves on the stepped piston plate 9017, and the hydraulic oil can only flow through the oil passing holes 9019. When the stepped piston plate 9017 moves downward, the stepped piston plate 9017 separates from the sliding ring 9018, and the hydraulic oil can flow through the annular channel between the stepped piston plate 9017 and the side wall of the hydraulic cylinder 9012, and in cooperation with the setting of the flow guiding cone 9016, the resistance when the stepped piston plate 9017 moves downward is less than the resistance when it moves upward. Thus, the upward movement of the axle is relatively slow, and the downward movement is faster, enabling the axle to fully receive the impact load of the pad body 304 and quickly contact the next pad body 304 after the previous pad body 304 is lifted.

[0057] During use, place the axle with wheels installed on the top right end of the annular chain conveyor 200. The pad body 304 bears the wheels. Drive the drive shaft 201 to rotate through the drive motor, so that the chain body 205 moves counterclockwise, and the axle moves from right to left. With the cooperation of the experimenter, the axle is clamped into the inside of the C-shaped plate 906. Then, push the clamping plate 910 downward to insert the clamping post 908 into the clamping slot 912, and then screw the bolt 911. The end of the bolt 911 presses against the right side of the axle, so that the axle is fixed inside the C-shaped plate 906;

[0058] During the counterclockwise movement of the chain body 205, drive the driven sprocket 204 and the driven shaft 202 to rotate, thereby driving the first gear 501 to rotate, driving the second gear 502 and the first swing arm 503 to rotate, and the first push post 504 makes a circular motion. During the movement of the first push post 504, it first inserts into the inside of the linear groove 506 to push the turntable 505 to rotate, and then separates from the linear groove 506, thereby driving the turntable 505 to rotate intermittently;

[0059] Drive the second swing arm 605 to rotate intermittently through the turntable 505, and the second push post 606 makes an intermittent circular movement, thereby driving the frame-shaped plate 604, the connecting rod 601, the connecting plate 603 and the sliding seat 405 to move intermittently. Then, through the connection of the sliding rod 404, the bearing plate 401 moves intermittently, so as to switch the relative position of the wave portion 402 and the axle, so that before and after the wave portion 402 moves, the height of the pad body 304 under the axle changes successively, applying different impacts to the wheels, and simulating the impact on the axle when the wheels are on a bumpy road surface;

[0060] When the wheel moves upward under the impact of the pad body 304, the hanging plate 902, the piston rod 9013 and the tray 9014 move upward, and the second spring 9015 is compressed and contracted. The stepped piston plate 9017 first inserts into the sliding ring 9018, and then the stepped piston plate 9017 and the sliding ring 9018 move upward together. The hydraulic oil flows through the oil hole 9019. By applying resistance to the stepped piston plate 9017 and the sliding ring 9018 through the hydraulic oil, the kinetic energy of the wheel moving upward is absorbed, so that the wheel rises slowly, and the axle fully receives the impact load of the pad body 304;

[0061] When the wheel descends, the second spring 9015 applies a downward thrust to assist the wheel in descending. The stepped piston plate 9017 first separates from the sliding ring 9018, and then continues to move downward. The hydraulic oil flows through the annular channel between the stepped piston plate 9017 and the hydraulic cylinder 9012, and cooperates with the guiding action of the guiding cone 9016, so that the resistance received by the stepped piston plate 9017 when moving downward is small, so that the resistance of the wheel when moving downward is small. After the wheel is lifted by the previous pad body 304, it can quickly descend and contact the next pad body 304.

[0062] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fatigue test device for axle production, comprising two frames (100), characterized in that: An annular chain conveyor (200) is arranged between the two racks (100). Lifting pads (300) are arranged in an array on the surface of the annular chain conveyor (200). A support assembly (400) is slidably connected to the rack (100). An intermittent rotation assembly (500) is fixedly installed at the right end of the annular chain conveyor (200). A reciprocating movement assembly (600) is arranged between the left side of the intermittent rotation assembly (500) and the support assembly (400). Limiting assemblies (700) are arranged at the bottoms of the front and rear ends of the support assembly (400); An arch frame (800) is fixedly installed between the tops of the two racks (100). The arch frame (800) is located directly above the support assembly (400). Two axle suspension assemblies (900) are fixedly installed on the top wall of the arch frame (800).

2. The fatigue test device for axle production according to claim 1, characterized in that: The annular chain conveyor (200) includes a driving shaft (201) and a driven shaft (202). The driving shaft (201) is rotatably connected between the left ends of the two racks (100). The driven shaft (202) is rotatably connected between the right ends of the two racks (100). Two driving sprockets (203) are fixedly installed on the surface of the driving shaft (201). Two driven sprockets (204) are fixedly installed on the surface of the driven shaft (202); The annular chain conveyor (200) further includes two chain bodies (205). The two chain bodies (205) are distributed front and rear. Each chain body (205) is connected between the driving sprocket (203) and the driven sprocket (204).

3. The fatigue test device for axle production according to claim 2, characterized in that: Each group of lifting pads (300) includes a mounting seat (301). The mounting seat (301) is fixedly installed on the outer link plate of the chain body (205). Three sliding holes (302) are penetrated and opened on the surface of the mounting seat (301). A sliding frame (303) is penetrated and slidably connected in the sliding hole (302). The sliding frame (303) is in a "mountain" shape. A pad body (304) is fixedly installed on the top of the sliding frame (303). The top of the pad body (304) is an arc surface.

4. The fatigue test device for axle production according to claim 1, characterized in that: The support assembly (400) includes a bearing plate (401). A wave portion (402) is arranged on the top of the bearing plate (401). The wave portion (402) is in a wave shape. An inclined portion (403) is arranged at the top of the right end of the bearing plate (401). Two sliding rods (404) are fixedly installed on the front and rear sides of the bearing plate (401). A sliding seat (405) is fixedly installed at one end of the two sliding rods (404) away from the bearing plate (401). A sliding groove (101) is penetrated and opened on the rack (100). The sliding rod (404) is slidably connected in the sliding groove (101). The sliding seat (405) is attached to the surface of the rack (100).

5. The fatigue test device for axle production according to claim 2, characterized in that: The intermittent rotation assembly (500) includes two first gears (501) respectively and fixedly installed at both ends of the driven shaft (202). A second gear (502) is meshed with the left side of the first gear (501). The diameter of the second gear (502) is smaller than that of the first gear (501). A first rotating arm (503) is coaxially fixed to the side of the second gear (502) close to the frame (100). A first push column (504) is fixedly installed at one end of the first rotating arm (503) away from the second gear (502). A turntable (505) is arranged on the left side of the second gear (502). The turntable (505) is attached to the side of the first rotating arm (503) away from the frame (100). Linear slots (506) are arrayed and penetrated through the turntable (505). The linear slots (506) penetrate to the edge of the turntable (505). During the rotation of the first rotating arm (503), the first push column (504) is inserted into the linear slots (506).

6. The fatigue test device for axle production according to claim 5, wherein: Each reciprocating movement assembly (600) includes two connecting rods (601). A support (602) is fixedly installed on the frame (100). The connecting rods (601) are slidably connected to the support (602). A connecting plate (603) is fixedly installed at the left end of the connecting rod (601). The connecting plate (603) is fixedly installed on the sliding seat (405). A frame-shaped plate (604) is fixedly installed at the right end of the connecting rod (601). A second rotating arm (605) is fixedly installed at the center of the turntable (505). A second push column (606) is fixedly installed on the side of the second rotating arm (605) away from the turntable (505). The second push column (606) is slidably connected in the frame-shaped plate (604).

7. The fatigue test device for axle production according to claim 6, wherein: The limiting assembly (700) includes a cross bar (701) fixedly installed on the frame (100). The cross bar (701) is located directly below the sliding groove (101). Limiting teeth (702) are arrayed on the top of the cross bar (701). A covering cylinder (703) is fixedly installed on the left side of the connecting plate (603). A first spring (704) is fixedly installed on the top wall of the covering cylinder (703). A limiting column (705) is fixedly installed at the bottom end of the first spring (704). The limiting column (705) is slidably connected through the bottom end of the covering cylinder (703). The bottom end of the limiting column (705) is hemispherical. The bottom end of the limiting column (705) is attached to the opposite side of two adjacent limiting teeth (702).

8. The fatigue test device for axle production according to claim 1, wherein: Each of the axle suspension assemblies (900) includes a hydraulic damper (901) and a U-shaped plate (904) fixedly installed on the top wall of the arched frame (800). A suspension plate (902) is fixedly installed at the bottom of the hydraulic damper (901). A vertical rod (903) is fixedly installed at the top of the suspension plate (902). The vertical rod (903) passes through and is slidably connected to the middle of the U-shaped plate (904). A deflection plate (905) is rotatably connected to the vertical part of the suspension plate (902). A C-shaped plate (906) is fixedly installed at the bottom end of the deflection plate (905). The opening of the C-shaped plate (906) faces to the right. An extension plate (907) is fixedly installed at the bottom end of the C-shaped plate (906). Two clamping posts (908) are fixedly installed on the right side of the extension plate (907). A blocking piece (909) is fixedly installed at the right end of the clamping post (908). A clamping plate (910) is slidably connected to the right side of the deflection plate (905). A bolt (911) is threadedly connected to the middle of the clamping plate (910). Two card slots (912) are formed through the bottom of the clamping plate (910).

9. The fatigue test device for axle production according to claim 8, characterized in that: The hydraulic damper (901) includes a base (9011) fixedly installed on the top wall of the arched frame (800). A hydraulic cylinder (9012) is fixedly installed at the bottom of the base (9011). The hydraulic cylinder (9012) is filled with hydraulic oil. A piston rod (9013) passes through and is slidably connected to the bottom end of the hydraulic cylinder (9012). A tray (9014) is fixedly installed on the surface of the piston rod (9013). The tray (9014) is located below the bottom end of the hydraulic cylinder (9012). A second spring (9015) is fixedly installed between the base (9011) and the tray (9014). A stepped piston plate (9017) is fixedly installed at the top end of the piston rod (9013). The diameter of the stepped piston plate (9017) is smaller than the inner diameter of the hydraulic cylinder (9012).

10. The fatigue test device for axle production according to claim 9, characterized in that: The cross-section of the stepped piston plate (9017) is in a "convex" shape. A diversion cone (9016) is fixedly installed at the bottom of the stepped piston plate (9017). A funnel part is provided at the bottom of the hydraulic cylinder (9012). A sliding ring (9018) is slidably connected in the hydraulic cylinder (9012). The outer diameter of the sliding ring (9018) is equal to the inner diameter of the hydraulic cylinder (9012). The inner diameter of the sliding ring (9018) is equal to the diameter of the upper half of the stepped piston plate (9017). Oil through holes (9019) are formed through the sliding ring (9018) in an array.

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