Leaf Spring Fatigue Test Device

Abstract

This application relates to the technical field of fatigue test setups, and in particular, to a leaf spring fatigue test device. The leaf spring fatigue test device includes: a drive rod, with the leaf spring to be tested arranged on the drive rod; a drive device, which is provided with a drive part that acts on one end of the drive rod; a resisting member, arranged on one side of the drive rod, and the leaf spring to be tested abuts against the resisting member; under the driving action of the drive device, the drive rod swings with the end away from the drive part as the center, and during the movement of the drive rod, the leaf spring to be tested is deformed under the action of the resisting member. The leaf spring fatigue test device provided by this application, through the application of the lever principle, on the premise of ensuring a small rotation angle of the leaf spring to be tested, amplifies the reciprocating stroke, facilitating precise stroke control by the drive device to meet the requirements of fatigue testing of the leaf spring to be tested under a small rotation angle.

Description

Technical Field

[0001] This application relates to the technical field of fatigue test setups, and particularly to a leaf spring fatigue test device. Background Art

[0002] Currently, a leaf spring is a component that operates based on the principle of elasticity. A component made of an elastic material deforms under the action of an external force and can return to its initial state after the external force disappears. It can not only provide an elastic restoring force but also has a certain buffering and vibration damping effect. During the entire life cycle of a leaf spring, there will be a reciprocating loading situation of over one million times. Therefore, the fatigue life of a leaf spring is an important indicator affecting the stable operation of the system. Fatigue test devices often use a rotating motor and a telescopic cylinder as power elements to directly apply a load to the leaf spring, or through a reciprocating motion mechanism such as a crank and connecting rod mechanism, and design the device to have the same stroke and load as the working requirements of the leaf spring. Such methods are only applicable to fatigue tests with a relatively large reciprocating stroke and cannot perform fatigue tests on the reciprocating stroke formed by a small rotation angle. Summary of the Invention

[0003] The purpose of this application is to provide a leaf spring fatigue test device to, to a certain extent, solve the technical problem in the existing technology that conventional fatigue test devices are only applicable to fatigue tests with a relatively large reciprocating stroke and cannot perform fatigue tests on the reciprocating stroke formed by a small rotation angle.

[0004] This application provides a leaf spring fatigue test device, including: a driving rod, with the leaf spring to be tested arranged on the driving rod;

[0005] A driving device, which is provided with a driving part, and the driving part acts on one end of the driving rod;

[0006] A resisting member, arranged on one side of the driving rod, and the leaf spring to be tested abuts against the resisting member; under the driving action of the driving device, the driving rod swings with the end away from the driving part as the center, and during the movement of the driving rod, the leaf spring to be tested deforms under the action of the force from the resisting member.

[0007] In the above technical solution, further, the driving rod includes:

[0008] A connecting rod;

[0009] A fixing frame, which is arranged on the connecting rod, and the leaf spring to be tested is arranged on the fixing frame, and the number of the leaf springs to be tested is at least two;

[0010] The resisting member is arranged on one side of the fixing frame.

[0011] In any of the above technical solutions, further, the leaf spring fatigue testing device further includes a fixed platform; the driving device and the resisting member are fixedly arranged on the fixed platform;

[0012] The first fixing part and the second fixing part are arranged on the fixed platform at intervals, one end of the connecting rod is rotatably connected to the first fixing part, and the other end of the connecting rod is rotatably connected to the second fixing part.

[0013] In any of the above technical solutions, further, the leaf spring fatigue testing device further includes:

[0014] A first tension spring, one end of the first tension spring is fixed to the first fixing part, the other end of the first tension spring is connected to the connecting rod, and the first tension spring extends along a first direction;

[0015] A second tension spring, one end of the second tension spring is fixed to the first fixing part, the other end of the second tension spring is connected to the connecting rod, and the second tension spring extends along a second direction different from the first direction.

[0016] In any of the above technical solutions, further, the leaf spring fatigue testing device further includes a limiting device; the driving device is arranged on one side of the connecting rod, and the limiting device is arranged on the other side of the connecting rod;

[0017] The limiting device includes a base arranged on the first fixing part and a roller arranged on the base and capable of rotating relative to the base.

[0018] In any of the above technical solutions, further, the second fixing part is provided with a fixed seat, and one end of the connecting rod is rotatably connected to the fixed seat.

[0019] In any of the above technical solutions, further, one end of the connecting rod for connecting the second fixing part is formed with a bent portion, the bent portion is bent towards the second fixing part, and the bent portion is rotatably connected to the fixed seat through a bearing.

[0020] In any of the above technical solutions, further, one end of the to-be-tested leaf spring is provided with an abutting portion for abutting against the resisting member, and a ball bearing is arranged on the abutting portion; the other end of the to-be-tested leaf spring is provided with a connecting portion for connecting with the fixing frame;

[0021] The connecting portion includes a positioning hole and a connecting hole, the connecting hole is used for passing through a fastening member, the positioning hole is used for passing through a positioning member, and both the fastening member and the positioning member are connected to the fixing frame.

[0022] In any of the above technical solutions, further, the leaf spring fatigue testing device further includes:

[0023] Controller;

[0024] Control valve group, the control valve group is connected to the controller;

[0025] The driving device is connected to the control valve group, and the driving device is a double-acting cylinder.

[0026] In any of the above technical solutions, further, the control valve group includes:

[0027] The first valve is arranged on the air path for supplying air to the driving device;

[0028] The speed control valve is connected to the driving device;

[0029] The reversing valve is connected to the driving device, and the reversing valve is connected to the controller.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] The leaf spring fatigue test device provided by the present application includes: a driving rod, a leaf spring to be tested is arranged on the driving rod; a driving device, the driving device is provided with a driving part, and the driving part acts on one end of the driving rod; a resisting member, which is arranged on one side of the driving rod, and the leaf spring to be tested abuts against the resisting member; under the driving action of the driving device, the driving rod swings around the end far from the driving part, and during the movement of the driving rod, the leaf spring to be tested is deformed by the acting force of the resisting member.

[0032] The leaf spring fatigue test device provided by the present application, through the application of the lever principle, on the premise of ensuring a small rotation angle of the leaf spring to be tested, amplifies the reciprocating stroke, which is convenient for the driving device to perform precise stroke control to meet the requirements of fatigue testing of the leaf spring to be tested under a small rotation angle. Description of the Drawings

[0033] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of the leaf spring fatigue test device provided by the embodiment of the present application;

[0035] Figure 2 It is a partial schematic structural diagram of the leaf spring fatigue test device provided by the embodiment of the present application;

[0036] Figure 3Schematic structural diagram of the leaf spring to be tested of the leaf spring fatigue testing device provided by an embodiment of the present application;

[0037] Figure 4 Another partial structural diagram of the leaf spring fatigue testing device provided by an embodiment of the present application;

[0038] Figure 5 Schematic structural diagram of the resisting member of the leaf spring fatigue testing device provided by an embodiment of the present application.

[0039] Reference numerals:

[0040] 1 - driving rod, 101 - connecting rod, 102 - fixing bracket, 103 - bending part, 104 - metal ball, 2 - driving device, 201 - body part, 202 - driving part, 3 - resisting member, 301 - bottom plate, 302 - supporting plate, 303 - stopper, 4 - leaf spring to be tested, 401 - abutting part, 4011 - ball bearing, 402 - connecting part, 4021 - positioning hole, 4022 - connecting hole, 5 - fixing platform, 501 - first fixing part, 5011 - first cushion block, 5012 - leveling cushion block, 5013 - waist-shaped hole, 502 - second fixing part, 5021 - second cushion block, 5022 - fixing seat, 503 - fixing hole, 504 - handle, 505 - fixing column, 6 - first tension spring, 7 - second tension spring, 8 - limiting device, 801 - base, 802 - roller, 9 - controller, 10 - first valve, 11 - speed regulating valve, 12 - reversing valve, a - first direction, b - second direction. Detailed implementation manners

[0041] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0042] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0043] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0046] The following refers to Figures 1 to 5 Describe the leaf spring fatigue test device according to the embodiments of the present application.

[0047] See Figures 1 to 5 As shown, the embodiments of the present application provide a leaf spring fatigue test device, which can apply a small load to the leaf spring to truly simulate the working state of the leaf spring with a small rotation amplitude during actual use, so as to perform a relatively accurate fatigue test on such leaf springs. The leaf spring fatigue test device provided by the embodiments of the present application includes: a fixed platform 5, a driving rod 1, a driving device 2 and a resisting member 3. Among them, the driving device 2 and the resisting member 3 are both fixedly arranged on the fixed platform 5, the driving rod 1 is rotatably arranged on the fixed platform 5, the driving device 2 includes a body part 201 fixed relative to the fixed platform 5 and a driving part 202 capable of telescoping relative to the body part 201, and the driving part 202 can reciprocally move towards or away from the driving rod 1. When the driving part 202 approaches the driving rod 1, the driving part 202 can abut against the driving rod 1 so that the driving rod 1 can be deflected by force. The leaf spring 4 to be tested is arranged on the driving rod 1, the resisting member 3 is arranged on one side of the driving rod 1, and the resisting member 3 is arranged at a position close to the driving rod 1 where the leaf spring 4 to be tested is located, so that when the driving device 2 pushes the driving rod 1 to move, the driving rod 1 and the leaf spring 4 to be tested on the driving rod 1 can approach or move away from the resisting member 3, so that the leaf spring 4 to be tested can contact the resisting member 3 and be deformed by force, thereby simulating the stress condition of the leaf spring 4 to be tested under a small load.

[0048] It should be noted that since the driving rod 1 has a certain length, and the driving part 202 of the driving device 2 acts on one end of the driving rod 1, and the plate spring 4 to be tested is close to the end of the driving rod 1 far from the driving device 2, when the driving device 2 drives the driving rod 1 to deflect slightly, the driving rod 1 can, to a certain extent, amplify the deflection amplitude of the other end of the driving rod 1 and the plate spring 4 to be tested.

[0049] Furthermore, the driving rod 1 includes a connecting rod 101 with a certain length. One end of the connecting rod 101 is connected to the following first fixing part 501 on the fixed platform 5, so that the first fixing part 501 can stably support the connecting rod 101. The other end of the connecting rod 101 is rotatably connected to the following second fixing part 502 on the fixed platform 5. A fixing frame 102 is arranged at the end of the driving rod 1 relatively far from the driving device 2. The plate spring 4 to be tested is arranged on the fixing frame 102.

[0050] Preferably, the fixing frame 102 has a four-sided frame structure, and the resisting member 3 is arranged close to the fixing frame 102. In the state as shown in Figure 2 and Figure 3 , the two sides of the fixing frame 102 perpendicular to the fixed platform 5 are respectively connected to the connecting rod 101 and the bent part 103. A total of four surfaces, namely the upper and lower surfaces of the two sides of the fixing frame 102 parallel to the fixed platform 5, can be provided with the plate springs 4 to be tested, so that the plate spring fatigue testing device of the present invention can perform fatigue tests on multiple plate springs 4 to be tested at one time, and the multiple plate springs 4 to be tested can have the same thickness, length and other specifications, or can have different specifications. That is to say, the plate spring fatigue testing device provided by the present application can perform fatigue tests on four groups of the same or different plate springs 4 to be tested, significantly improving the testing efficiency.

[0051] Furthermore, the plate spring fatigue testing device provided by the embodiment of the present application further includes a fixed platform 5. Components such as the driving device 2, the resisting member 3 and the driving rod 1 are all arranged on the fixed platform 5. Specifically, the fixed platform 5 has a flat plate structure, and a first fixing part 501 and a second fixing part 502 are arranged on the fixed platform 5.

[0052] Preferably, fixing holes 503 are arranged at the four top corners and the edges of the fixed platform 5, and screw fasteners can be passed through the fixing holes 503 to fix the fixed platform 5 to a fixed position such as an operating table. In addition, at least one handle 504 is arranged on the upper surface of the fixed platform 5 to facilitate the transfer and handling of the plate spring fatigue testing device of the present invention.

[0053] Further, the first fixing portion 501 includes a first cushion block 5011 fixedly arranged on the fixed platform 5. A leveling cushion block 5012 is fixedly arranged on the first cushion block 5011. One end of the connecting rod 101 is connected to the leveling cushion block 5012. The body portion 201 of the driving device 2 is fixedly arranged on the first cushion block 5011, and the driving portion 202 of the driving device 2 is arranged facing the connecting rod 101.

[0054] Further, the second fixing portion 502 includes a second cushion block 5021 fixedly arranged on the fixed platform 5 and a fixing seat 5022 arranged on the second cushion block 5021, and the fixing seat 5022 is specifically a bearing seat installed with bearings.

[0055] A bent portion 103 is arranged at one end of the connecting rod 101 away from the driving device 2, so that one end of the connecting rod 101 away from the driving device 2 has an "L" shape, and the end of the connecting rod 101 can be bent toward the fixing seat 5022. A rotating shaft is arranged on the portion of the connecting rod 101 bent toward the fixing seat 5022. The rotating shaft is rotatably connected to the fixing seat 5022 of the second fixing portion 502 through a bearing. With such an arrangement, one end of the connecting rod 101 can rotate in place relative to the second fixing portion 502 with the fixing seat 5022 as a reference without displacement. When the other end of the connecting rod 101 is stressed and deflected, the connecting rod 101 deflects based on the principle of a lever, thereby amplifying the deflection amplitude of the connecting rod 101, so that the fixing frame 102 and the to-be-tested leaf spring 4 arranged on the fixing frame 102 can rotate with a small amplitude. During the actual test process, the rotation angle of the to-be-tested leaf spring 4 relative to the rotation center is only 4 mrad, and the one-way displacement stroke is only 0.52 mm. Both the rotation angle and the stroke of the to-be-tested leaf spring 4 meet the requirements of small quantities. It should be noted that in the leaf spring fatigue test device provided in the present application, the connecting rod 101 is set to an "L" shape, which can make the relative position between the to-be-tested leaf spring 4 and the rotation center consistent with the actual working condition. The position and installation angle of the to-be-tested leaf spring 4 installed on the connecting rod 101 are the same as those in the actual working condition. The distance between the anti-blocking member 3 and the to-be-tested leaf spring 4 is the same as that in the actual working condition. Therefore, the fatigue test working condition of the to-be-tested leaf spring 4 in the leaf spring fatigue test device provided in this embodiment is exactly the same as the actual working condition, ensuring the referenceability of the fatigue test result for engineering applications.

[0056] Further, the resisting member 3 includes a bracket and a stopper 303. The bracket includes a bottom plate 301 and a support plate 302 vertically disposed on the bottom plate 301. The bottom plate 301 is fixedly disposed on the upper surface of the fixed platform 5. The stopper 303 is connected to the support plate 302. The stopper 303 has a columnar structure. The to-be-tested leaf spring 4 abuts against the stopper 303, and the stopper 303 abuts against the stopper 303, so that the support plate 302 can stably support the stopper 303. And since the support plate 302 is vertically disposed with respect to the bottom plate 301, they have strong stability, which further improves the stability of the stopper 303.

[0057] The leaf spring fatigue test device provided by the embodiment of the present application further includes a first tension spring 6 and a second tension spring 7. The first tension spring 6 extends along a first direction a, where the first direction a is a horizontal direction. One end of the first tension spring 6 is fixed to the fixed platform 5. Preferably, a fixed column 505 is provided on the fixed platform 5, and one end of the first tension spring 6 is sleeved and fixed on the fixed column 505. The other end of the first tension spring 6 is connected to the connecting rod 101. The first tension spring 6 can continuously apply a pulling force in the horizontal direction to the connecting rod 101, so that the connecting rod 101 always has a tendency to move closer to the driving device 2. When the driving part 202 acts on the connecting rod 101 to deflect the connecting rod 101 and the driving part 202 retracts to its original position, the first tension spring 6 pulls the connecting rod 101 towards the driving device 2. In this way, the connecting rod 101 and the to-be-tested leaf spring 4 provided on the connecting rod 101 can continuously deflect under the combined action of the driving device 2 and the first tension spring 6, so that the to-be-tested leaf spring 4 can regularly be squeezed by the resisting member 3.

[0058] The second tension spring 7 extends along a second direction b, and the second direction b is the vertical direction. One end of the second tension spring 7 is fixedly connected to the leveling pad 5012, and the other end of the second tension spring 7 is connected to the lower surface of the connecting rod 101. The second tension spring 7 can apply a pulling force to the connecting rod 101 in the vertical direction, avoiding the connecting rod 101 from jumping during the rapid reciprocating motion, thereby avoiding introducing interference factors that affect the test accuracy when performing fatigue tests on the to-be-tested leaf spring 4.

[0059] Preferably, the leveling pad 5012 is provided with a waist-shaped hole 5013. The leveling pad 5012 is disposed on one side of the first pad 5011 opposite to the second pad 5021. The waist-shaped hole 5013 is disposed on the wall surface of the leveling pad 5012 with a larger area. Preferably, as Figure 4In the state shown, the length of the kidney-shaped hole 5013 is distributed in the vertical direction. The kidney-shaped hole 5013 penetrates the leveling pad 5012 in the horizontal direction. The number of the kidney-shaped holes 5013 is preferably two. The leveling pad 5012 is connected to the side wall of the first pad 5011 through bolts passing through the kidney-shaped holes 5013. Before the fatigue test, the connecting rod 101 can be leveled by adjusting the up and down position of the leveling pad 5012 relative to the first pad 5011, ensuring that the connecting rod 101 and the leaf spring 4 to be tested provided on the connecting rod 101 can be evenly stressed during the fatigue test.

[0060] Preferably, metal balls 104 are provided on the lower surface of the connecting rod 101. The metal balls 104 are arranged between the connecting rod 101 and the upper surface of the leveling pad 5012, so that the connecting rod 101 and the leveling pad 5012 are connected through the metal balls 104. This can not only enable the connecting rod 101 to be supported by the leveling pad 5012, but also allow planar sliding between the two, effectively reducing the friction force between the two.

[0061] The leaf spring fatigue test device provided by the embodiment of the present application further includes a limiting device 8. The limiting device 8 and the driving device 2 are respectively arranged on both sides of the connecting rod 101. Preferably, the limiting device 8 can be a polyurethane follower. The limiting device 8 includes a base 801 and a roller 802 rotatably connected to the base 801. The base 801 is fixedly arranged on the first pad 5011. The axis of the roller 802 extends in the vertical direction, and the roller 802 is made of polyurethane material and has a certain flexibility. When the driving device 2 pushes the connecting rod 101, the limiting device 8 can prevent the connecting rod 101 from deflecting excessively. And because the roller 802 can rotate, when the connecting rod 101 abuts against or impacts the roller 802, the roller 802 can play a role in buffering and shock absorption.

[0062] Further, one end of the leaf spring 4 to be tested is provided with an abutting portion 401, and the other end of the leaf spring 4 to be tested is provided with a connecting portion 402. The abutting portion 401 has a block structure and abuts against the resisting member 3. The connecting portion 402 also has a block structure, and at least two positioning holes 4021 are provided on the connecting portion 402. The positioning holes 4021 are used for passing through positioning pins. The positioning pins pass through the positioning holes 4021 and are connected to the positioning grooves on the connecting rod 101 to ensure the positioning accuracy of each leaf spring 4 to be tested and the connecting rod 101. At least two connecting holes 4022 are also provided on the connecting portion 402. The connecting holes 4022 are used for passing through fasteners. After the fasteners pass through the connecting holes 4022, they are connected to the connecting grooves on the connecting rod 101 to ensure the connection strength between the leaf spring 4 to be tested and the connecting rod 101.

[0063] Preferably, the fastener is an internal hexagonal socket head cap screw, which can prevent the end cap of the fastener from protruding relative to the connecting portion 402 and interfering with other components of the leaf spring fatigue test device.

[0064] Preferably, the abutting portion 401 is provided with a ball bearing 4011. The axis of the ball bearing 4011 is distributed in the vertical direction. The edge of the ball bearing 4011 contacts the resisting member 3. The ball bearing 4011 can reduce the friction between the leaf spring 4 to be tested and the resisting member 3 during the fatigue test.

[0065] Furthermore, the leaf spring fatigue test device provided by the embodiment of the present application further includes a controller 9 and a control valve group. The driving device 2 is connected to the controller 9 through the control valve group. The connection method can be electrical connection or communication connection, etc. The controller 9 can specifically be a PLC controller 9. The control valve group at least includes a first valve 10, a speed regulating valve 11, and a reversing valve 12. The controller 9, the first valve 10, the speed regulating valve 11, and the reversing valve 12 are all fixedly arranged on the fixed platform 5.

[0066] The driving device 2 is preferably a double-acting cylinder. The first valve 10 can be a manipulator valve. The manipulator valve is arranged on the air path for supplying air to the driving device 2. The manipulator valve is used to control the total on-off of the air path of the driving device 2. The speed regulating valve 11 is used to adjust the forward extension and retraction speeds of the driving part 202 of the driving device 2. The reversing valve 12 is electrically connected to the controller 9 and the driving device 2. Preferably, the reversing valve 12 is a two-position five-way solenoid valve, and the reversing valve 12 is provided with a driving member. The driving member is electrically connected or communicatively connected to the controller 9, so that the controller 9 can send a control instruction to the driving member to control the driving member to drive the reversing valve 12 to quickly reverse, so that the driving part 202 of the driving device 2 can quickly and reciprocally apply a force to the connecting rod 101. The driving member can be a motor, a cylinder, an oil cylinder, etc.

[0067] In summary, for the leaf spring fatigue test device provided by the present application, by applying the lever principle, on the premise of ensuring a small rotation angle of the leaf spring to be tested, the reciprocating stroke is amplified, which is convenient for the driving device to perform precise stroke control to meet the requirements of the fatigue test of the leaf spring to be tested under a small rotation angle.

[0068] In addition, the leaf spring fatigue test device provided by the present application can simultaneously test multiple groups of leaf springs to be tested by increasing the number of local levers. All the multiple groups of leaf springs to be tested are positioned by positioning pins to ensure the consistency of the installation positions of each leaf spring to be tested. Thus, under the same working conditions, fatigue tests can be simultaneously carried out on multiple groups of leaf springs to be tested with different specifications. The test process takes a short time and has high test efficiency. Traditional leaf spring test equipment usually adopts reciprocating motion mechanisms such as crank connecting rod mechanisms, gear rack mechanisms, and cam mechanisms. The structure is relatively complex, and there are problems such as great difficulty in machining and manufacturing and high later maintenance costs. Compared with traditional leaf spring test equipment, this leaf spring fatigue test device greatly simplifies the structure, uses a lever (connecting rod) as an actuator to amplify the reciprocating stroke of the leaf spring, and uses a cylinder as a power element to directly push the lever to generate displacement. There is no mechanism with complex structure and great machining difficulty, and it has stronger practicability.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A leaf spring fatigue testing device, characterized in that, it includes: A driving rod, and the leaf spring to be tested is arranged on the driving rod; A driving device, the driving device is provided with a driving part, and the driving part acts on one end of the driving rod; A resisting member, arranged on one side of the driving rod, and the leaf spring to be tested abuts against the resisting member; under the driving action of the driving device, the driving rod swings with the end far from the driving part as the center, and during the movement of the driving rod, the leaf spring to be tested is deformed by the acting force of the resisting member; The driving rod includes: A connecting rod; A fixing frame, the fixing frame is arranged on the connecting rod, the leaf spring to be tested is arranged on the fixing frame, and the number of the leaf springs to be tested is at least two; The resisting member is arranged on one side of the fixing frame; The leaf spring fatigue testing device further includes a fixing platform; the driving device and the resisting member are fixedly arranged on the fixing platform; The fixing platform is provided with a first fixing part and a second fixing part at intervals, one end of the connecting rod is rotatably connected to the first fixing part, and the other end of the connecting rod is rotatably connected to the second fixing part; The leaf spring fatigue testing device further includes: A first tension spring, one end of the first tension spring is fixed to the first fixing part, the other end of the first tension spring is connected to the connecting rod, and the first tension spring extends along a first direction; A second tension spring, one end of the second tension spring is fixed to the first fixing part, the other end of the second tension spring is connected to the connecting rod, and the second tension spring extends along a second direction different from the first direction.

2. The leaf spring fatigue testing device according to claim 1, characterized in that, the leaf spring fatigue testing device further includes a limiting device; the driving device is arranged on one side of the connecting rod, and the limiting device is arranged on the other side of the connecting rod; The limiting device includes a base arranged on the first fixing part and a roller arranged on the base and capable of rotating relative to the base.

3. The leaf spring fatigue testing device according to claim 1, characterized in that, the second fixing part is provided with a fixing seat, and one end of the connecting rod is rotatably connected to the fixing seat.

4. The leaf spring fatigue testing device according to claim 3, characterized in that, one end of the connecting rod for connecting the second fixing part is formed with a bent part, the bent part is bent towards the second fixing part, and the bent part is rotatably connected to the fixing seat through a bearing.

5. The leaf spring fatigue testing device according to claim 1, characterized in that, one end of the leaf spring to be tested is provided with an abutting part for abutting against the resisting member, and a ball bearing is arranged on the abutting part; the other end of the leaf spring to be tested is provided with a connecting part for connecting with the fixing frame; The connecting part includes a positioning hole and a connecting hole, the connecting hole is used for passing through a fastening member, the positioning hole is used for passing through a positioning member, and both the fastening member and the positioning member are connected to the fixing frame.

6. The leaf spring fatigue testing device according to any one of claims 1 to 5, characterized in that, the leaf spring fatigue testing device further includes: A controller; A control valve group, the control valve group being connected to the controller; The driving device is connected to the control valve group, and the driving device is a double-acting cylinder.

7. The leaf spring fatigue test device according to claim 6, characterized in that the control valve group includes: A first valve, disposed on the air path for supplying air to the driving device and the driving device; A speed control valve, connected to the driving device; A reversing valve, connected to the driving device, the reversing valve being connected to the controller.

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