A composite leaf spring testing device

Abstract

The utility model relates to the field of plate spring, specifically disclose a kind of detection device for composite material plate spring, including detection frame, still include: detection seat, install on detection frame, for applying load to composite material plate spring;Two adjusting seats, slidingly connected on detection frame, and two adjusting seats are configured as can be along the length direction of composite material plate spring synchronous approach or away;Two moving plates, respectively slidingly installed on two adjusting seats, moving plate is set as along the length direction of adjusting seat movement.The utility model in, by the self-adapting sliding design of moving plate along adjusting seat, provide movable space for plate spring end transverse extension, when plate spring bears load and occurs deformation, the transverse extension displacement generated at both ends can directly drive moving plate along adjusting seat and move steadily, will not be hindered due to the fixed constraint of fixture, ensure that plate spring only bears target load applied by detection seat in loading process.

Description

Technical Field

[0001] This utility model belongs to the field of leaf spring technology, and specifically relates to a testing device for composite material leaf springs. Background Technology

[0002] In the mechanical performance testing of composite leaf springs, the loading process is the core step. It requires applying loads that conform to the working conditions through a testing device to verify the stiffness, strength, and fatigue life of the leaf spring. Due to the influence of its fiber layup structure and resin matrix characteristics, the bending deformation of the effective working section of the leaf spring during the loading stage of static stiffness testing or the cyclic load of dynamic fatigue testing will cause the mounting parts at both ends to produce lateral displacement. This phenomenon is an inherent characteristic of composite leaf springs during the stress process, and the direction and magnitude of the extension will dynamically change with the magnitude and direction of the loaded load and the structural parameters of the leaf spring.

[0003] A search revealed that CN108981534B discloses a testing device for composite leaf springs, comprising a main housing. A hydraulic pump and a hydraulic oil tank are threadedly connected to one side of the main housing, and a control box is pinned to the other side of the main housing. The main housing contains a first testing chamber, a second testing chamber, and a third testing chamber. The first and second testing chambers are located above the third testing chamber, and the first testing chamber is located to one side of the second testing chamber. A connecting plate is inserted between the first and second testing chambers, and a measuring scale is glued to the rear end of the inner surface of the first testing chamber.

[0004] In existing testing devices, the clamps at both ends are mostly fixed rigid structures, which can only achieve positioning and clamping of the leaf spring mounting part. They cannot adaptively adjust with the lateral extension of the leaf spring when it is loaded, which causes the two ends of the leaf spring to be forcibly constrained by the clamps during the extension process, generating additional lateral stress and affecting the authenticity and accuracy of the test results. Utility Model Content

[0005] The purpose of this invention is to provide a testing device for composite leaf springs, in order to solve the problem that the two end clamps of the testing device mentioned in the background art are fixed rigid structures, which can only achieve positioning and clamping of the leaf spring mounting part, and cannot adaptively adjust with the lateral extension of the leaf spring when it is loaded.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A testing device for composite leaf springs includes a testing frame and further includes: The test stand, mounted on the test frame, is used to apply loads to composite leaf springs; Two adjusting seats are slidably connected to the testing frame, and the two adjusting seats are configured to move closer or further apart synchronously along the length of the composite leaf spring; Two movable plates are slidably mounted on two adjusting seats, and the movable plates are set to move along the length of the adjusting seats. Two assembly heads are rotatably mounted on two movable plates, and the two assembly heads are symmetrically arranged for assembling composite leaf springs.

[0007] In one embodiment, the testing frame has an adjustment groove extending along the length of the composite material leaf spring, and two adjustment seats are slidably embedded in the adjustment groove, with the adjustment seats and the inner wall of the adjustment groove forming a guiding fit.

[0008] In one embodiment, the detection frame includes: Two lead screws are installed in the adjustment groove, and the two lead screws are threadedly connected to the two adjustment seats respectively. Two drive wheels are respectively mounted on two first lead screws, and the two drive wheels mesh with each other; A knob is rotatably mounted on the side of the testing frame, and the knob is connected to one end of the first lead screw away from the drive gear.

[0009] Preferably, the detection frame further includes: The movable slot is located on the testing frame; The movable seat is installed inside the movable slot, and the detection seat is installed on the movable seat; The second lead screw is installed in the groove along the length of the moving groove. The second lead screw is threadedly connected to the moving seat. One end of the second lead screw extends into the adjusting groove and is connected to the first lead screw through a transmission component.

[0010] In one embodiment, the transmission component includes: The second bevel gear is installed at one end of the second lead screw; The first bevel gear is installed on one side of the drive wheel, and the first bevel gear meshes with the second bevel gear.

[0011] In one embodiment, the detection seat includes: The bottom of the detection head and the detection base has a connecting groove, and the detection head is installed in the connecting groove; The power source is installed on the top of the detection base, and the power shaft of the power source is connected to the detection head; The pressure sensor is installed at the bottom of the detection base.

[0012] In a preferred embodiment, the adjustment seat includes: A groove is formed on one side of the adjusting seat, and the movable plate is installed in the groove; The distance sensor is mounted on the inner wall of the groove.

[0013] In a preferred embodiment, the assembly head includes: The assembly slot is located on one side of the assembly head.

[0014] In one embodiment, the assembly head further includes: Two clamping heads are provided, and mounting slots are provided on both sides of the inner wall of the assembly slot. The two clamping heads are respectively installed in the two mounting slots. Two elastic elements are installed on the inner walls of two mounting slots respectively, and the elastic elements are connected to the clamping head.

[0015] In one embodiment, a rotating shaft is installed on the side of the movable plate near the assembly head, and the assembly head is rotatably connected to the movable plate via the rotating shaft.

[0016] This invention provides a testing device for composite leaf springs. Compared with the prior art, it has the following advantages: The adaptive sliding design of the moving plate along the adjusting seat provides movable space for the lateral extension of the leaf spring end. When the leaf spring deforms under load, the lateral extension displacement at both ends can directly drive the moving plate to move smoothly along the adjusting seat without being hindered by the fixed constraint of the clamp. The distance sensor on the adjusting seat can capture the displacement change of the moving plate in real time, indirectly reflecting the lateral extension amplitude of the leaf spring, ensuring that the leaf spring only bears the target load applied by the testing seat during loading. Through the cooperation of two first lead screws and meshing drive wheels, the two adjusting seats can be moved synchronously closer or further away along the testing frame. The distance between the adjusting seats can be adjusted according to the length of the leaf spring to be tested simply by turning a knob, allowing testing of leaf springs of different sizes. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram from another perspective of the present invention.

[0019] Figure 3 This is a schematic cross-sectional view of the testing frame proposed in this utility model.

[0020] Figure 4 This is a schematic cross-sectional view of the detection seat and detection head proposed in this utility model.

[0021] Figure 5 This is a schematic diagram of the adjusting seat, moving plate, and assembly head structure proposed in this utility model.

[0022] Figure 6 This is a schematic diagram of the cross-section of the assembly head proposed in this utility model.

[0023] The reference numerals in the figure are as follows: 100, detection frame; 101, adjustment groove; 102, first lead screw; 103, drive wheel; 104, moving groove; 105, moving seat; 106, second lead screw; 107, first bevel gear; 108, second bevel gear; 109, knob; 200, detection seat; 201, detection head; 202, pressure sensor; 203, power source; 300, adjustment seat; 301, groove; 302, moving plate; 303, distance sensor; 400, assembly head; 401, assembly groove; 402, clamping head; 403, elastic element. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figures 1-6 A testing device for composite leaf springs includes a testing frame 100, and further includes: The test seat 200 is mounted on the test frame 100 and is used to apply load to the composite material leaf spring. Two adjusting seats 300 are slidably connected to the detection frame 100, and the two adjusting seats 300 are configured to move closer or further away synchronously along the length direction of the composite material leaf spring; Two movable plates 302 are slidably mounted on two adjusting seats 300 respectively, and the movable plates 302 are configured to move along the length direction of the adjusting seats 300. Two assembly heads 400 are rotatably mounted on two movable plates 302 respectively. The two assembly heads 400 are symmetrically arranged and are used to assemble composite material leaf springs.

[0026] In the above technical solution, the synchronous approach or departure of the two adjusting seats 300 along the length of the composite material leaf spring allows for adjustment of the spacing according to the length of the leaf spring to be tested, improving the versatility of the device. The movement of the moving plate 302 along the length of the adjusting seat 300 can accommodate the lateral extension deformation generated at both ends of the leaf spring during loading, avoiding rigid constraints on the ends of the leaf spring by the adjusting seats 300 and reducing the generation of additional lateral stress. The rotating installation design of the assembly head 400 can adapt to the small angle changes that occur at the ends of the leaf spring during deformation, further reducing the influence of the assembly structure on the stress state of the leaf spring. It should be noted that the symmetrical arrangement of the assembly head 400 is not merely for structural aesthetics, but to ensure that the center of force of the assembled leaf spring coincides with the load application center of the testing seat 200, avoiding additional bending moment caused by force offset.

[0027] The testing frame 100 has an adjustment groove 101 extending along the length of the composite material leaf spring. Two adjustment seats 300 are slidably embedded in the adjustment groove 101, and the adjustment seats 300 are in contact with the inner wall of the adjustment groove 101 to form a guiding fit.

[0028] The testing frame 100 includes: two first lead screws 102, which are installed in the adjustment groove 101 and are threadedly connected to two adjustment seats 300 respectively; two drive wheels 103, which are respectively installed on the two first lead screws 102 and mesh with each other; and a knob 109, which is rotatably installed on the side of the testing frame 100 and is connected to the end of one of the first lead screws 102 away from the drive gear.

[0029] Specifically, the guiding engagement between the adjusting groove 101 and the adjusting seat 300 ensures that the adjusting seat 300 moves only along the length of the detection frame 100; the threaded connection between the first lead screw 102 and the adjusting seat 300 utilizes the force transmission characteristics of the screw drive to convert the rotational torque input by the knob 109 into the axial thrust of the adjusting seat 300, thereby achieving continuous adjustment of the spacing; the meshing design of the two drive wheels 103, based on the reverse synchronization principle of gear transmission, makes the rotation directions of the two first lead screws 102 opposite and their speeds the same, driving the two adjusting seats 300 to move closer or further away synchronously, ensuring that the force center of the leaf spring is always aligned with the load application center of the detection seat 200 during the adjustment process.

[0030] The testing frame 100 further includes: a movable groove 104, which is formed on the testing frame 100; a movable seat 105, which is installed in the movable groove 104, and the testing seat 200 is installed on the movable seat 105; a second lead screw 106, which is installed in the groove along the length direction of the movable groove 104, and is threadedly connected to the movable seat 105. One end of the second lead screw 106 extends into the adjusting groove 101 and is connected to the first lead screw 102 through a transmission component.

[0031] The transmission component includes: a second bevel gear 108, which is installed at one end of the second lead screw 106; and a first bevel gear 107, which is installed on one side of the drive wheel 103, and the first bevel gear 107 meshes with the second bevel gear 108.

[0032] In the above technical solution, the moving groove 104 and the moving seat 105 are based on the principle of linear motion constraint, ensuring that the moving seat 105 moves only along the length direction of the moving groove 104, providing stable guidance for the position adjustment of the detection seat 200. The threaded connection design between the second lead screw 106 and the moving seat 105 converts the rotational torque into a linear force that pushes the moving seat 105 along the axis of the lead screw, realizing the continuous adjustment of the position of the detection seat 200. Furthermore, due to the reverse self-locking property of the threaded transmission, the moving seat 105 can maintain its current position after the adjustment stops, without the need for an additional locking mechanism; in the first When the lead screw 102 rotates, the first bevel gear 107 drives the second bevel gear 108 and the second lead screw 106 to rotate. The second lead screw 106 can drive the movable seat 105 to move within the movable groove 104. That is, when the two adjusting seats 300 are close to each other, smaller leaf springs can be tested. Moreover, while adjusting the adjusting seats 300, the position of the testing seat 200 can also be adjusted so that the testing seat 200 is closer to the leaf spring. Conversely, when the two adjusting seats 300 are far apart, the testing seat 200 is also far away from the leaf spring. At this time, larger leaf springs can be tested.

[0033] The detection seat 200 includes: a detection head 201, with a connecting groove at the bottom of the detection seat 200, and the detection head 201 is installed in the connecting groove; a power source 203, installed at the top of the detection seat 200, with the power shaft of the power source 203 connected to the detection head 201; and a pressure sensor 202, installed at the bottom of the detection seat 200.

[0034] Specifically, the power source 203 is a hydraulic cylinder or a pneumatic cylinder; the direct connection between the power source 203 and the detection head 201 can stably transmit the power output to the detection head 201, realize the precise application of load on the composite material leaf spring, and adapt to the load requirements of different testing scenarios such as static stiffness testing and ultimate load testing; the pressure sensor 202 is close to the force application end of the detection head 201, and can collect the actual force value in real time during the loading process to ensure the accuracy of the detection force value data.

[0035] The adjustment seat 300 includes: a groove 301, which is formed on one side of the adjustment seat 300, and the movable plate 302 is installed in the groove 301; a distance sensor 303 is installed on the inner wall of the groove 301.

[0036] Specifically, the groove 301 on one side of the adjusting seat 300 provides installation and movement space for the moving plate 302. The inner wall of the groove 301 fits snugly against the moving plate 302, which can limit the movement direction of the moving plate 302 and ensure that the moving plate 302 moves smoothly only along the extension direction of the groove 301. The distance sensor 303 is installed on the inner wall of the groove 301 and can directly detect the real-time displacement of the moving plate 302. This displacement can indirectly reflect the lateral extension of the end of the leaf spring.

[0037] The assembly head 400 includes: an assembly groove 401, which is formed on one side of the assembly head 400; two clamping heads 402, each of the inner walls of the assembly groove 401 having an installation groove, and the two clamping heads 402 being installed in the two installation grooves respectively; and two elastic elements 403, which are installed on the inner walls of the two installation grooves respectively, and the elastic elements 403 are connected to the clamping heads 402.

[0038] Specifically, the elastic element 403 is a compression spring or a spring block; the assembly groove 401 on one side of the assembly head 400 provides a space for the end of the composite material leaf spring to be accommodated and initially positioned. Under the action of the elastic element 403, the two clamping heads 402 form an elastic clamping on the end of the leaf spring from both sides of the assembly groove 401, avoiding local stress concentration or clamping loosening caused by rigid clamping. When the thickness of the leaf spring end is slightly large, the clamping head 402 compresses the elastic element 403 to obtain a larger clamping space; when the thickness is slightly small, the rebound force of the elastic element 403 keeps the clamping head 402 in contact, ensuring clamping stability.

[0039] A rotating shaft is installed on the side of the movable plate 302 near the assembly head 400, and the assembly head 400 is rotatably connected to the movable plate 302 via the rotating shaft.

[0040] In the above technical solution, the rotating connection between the moving plate 302 and the assembly head 400 via a rotating shaft can adapt to the small angular deflection generated at the end of the composite material leaf spring when it is loaded and deformed. When the leaf spring is subjected to vertical load and undergoes bending deformation, its end will rotate around its own axis in a small range as the curvature changes. The rotating shaft allows the assembly head 400 to rotate synchronously with the end of the leaf spring, avoiding the rigid angular constraint formed by the moving plate 302 on the assembly head 400. This eliminates the additional bending moment caused by angular misalignment, reduces the interference of this bending moment on the stress state of the leaf spring, and makes the stress distribution of the leaf spring during the testing process closer to the actual scenario, thereby improving the authenticity of the test data such as static stiffness and fatigue life.

[0041] During use, rotating the knob 109 on the side of the testing frame 100 drives the first lead screw 102 connected to it to rotate. Since the drive wheels 103 on the two first lead screws 102 mesh with each other and their threads rotate in opposite directions, the two first lead screws 102 rotate synchronously in opposite directions, driving the two adjusting seats 300 respectively threaded to them to move synchronously closer or further away along the adjusting groove 101 on the testing frame 100 until the distance between the two adjusting seats 300 matches the length of the leaf spring to be tested, and then the operation of the knob 109 is stopped. During the rotation of the first lead screw 102, the first bevel gear 107 rotates synchronously, and drives the second lead screw 106 to rotate through meshing with the second bevel gear 108. The second lead screw 106 is threadedly connected to the moving seat 105, and the rotation of the second lead screw 106 is converted into the linear movement of the moving seat 105, driving the testing seat 200 mounted on the moving seat 105 to move synchronously.

[0042] The two ends of the leaf spring to be tested are respectively embedded into the assembly grooves 401 of the two assembly heads 400; the clamping heads 402 in the mounting grooves on both sides of the assembly groove 401 form an elastic clamp from both sides of the leaf spring end under the action of the elastic force of the elastic element 403. If there is a slight deviation in the thickness of the leaf spring end, the clamping head 402 can adaptively adjust the clamping space by compressing or extending the elastic element 403 to ensure that the leaf spring end is stably clamped and there is no local stress concentration; the assembly head 400 is rotatably connected to the moving plate 302 through the rotating shaft. In the initial state, the assembly head 400 naturally fits with the leaf spring end without rigid angle constraint.

[0043] According to the requirements of the testing project, the loading parameters are set in the equipment control system. For static stiffness testing, the loading rate and loading range are set; for ultimate load testing, the holding time and ultimate load threshold are set; for fatigue life testing, the cyclic load spectrum, cyclic frequency and target number of cycles are set.

[0044] The power source 203 at the top of the test seat 200 is activated. The power source 203 drives the test head 201 to apply a preset load to the middle of the leaf spring through the power shaft. During the loading process, the pressure sensor 202 at the bottom of the test seat 200 collects the actual force value applied to the leaf spring by the test head 201 in real time and transmits it to the control system synchronously. The distance sensor 303 monitors the displacement of the moving plate 302 in real time. If it is a dynamic fatigue test, it is also necessary to record the small angle change of the assembly head 400 with the end of the leaf spring.

[0045] After the testing process is completed, the power source 203 is turned off, and the test head 201 is slowly retracted to the initial position to release the load on the leaf spring; the leaf spring is removed from the assembly slot 401 and its condition after testing is checked.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing device for composite leaf springs, comprising a testing frame (100), characterized in that, Also includes: The test seat (200), mounted on the test frame (100), is used to apply load to the composite leaf spring; Two adjustment seats (300) are slidably connected to the detection frame (100), and the two adjustment seats (300) are configured to move closer or further away synchronously along the length of the composite leaf spring; Two movable plates (302) are slidably mounted on two adjusting seats (300), and the movable plates (302) are configured to move along the length direction of the adjusting seats (300); Two assembly heads (400) are rotatably mounted on two movable plates (302), and the two assembly heads (400) are symmetrically arranged for assembling composite leaf springs.

2. The testing device for composite leaf springs according to claim 1, characterized in that, The testing frame (100) has an adjustment groove (101) extending along the length of the composite material leaf spring. Two adjustment seats (300) are slidably embedded in the adjustment groove (101), and the adjustment seats (300) and the inner wall of the adjustment groove (101) are fitted together to form a guide fit.

3. The testing device for composite leaf springs according to claim 2, characterized in that, The testing frame (100) includes: Two first lead screws (102) are installed in the adjustment groove (101), and the two first lead screws (102) are respectively threaded to the two adjustment seats (300); Two drive wheels (103) are respectively mounted on two first lead screws (102), and the two drive wheels (103) mesh with each other; A knob (109) is rotatably mounted on the side of the test frame (100), and the knob (109) is connected to one end of the first lead screw (102) away from the drive gear.

4. The testing device for composite leaf springs according to claim 3, characterized in that, The testing frame (100) also includes: A movable slot (104) is provided on the inspection frame (100); The movable seat (105) is installed in the movable slot (104), and the detection seat (200) is installed on the movable seat (105); The second lead screw (106) is installed in the groove along the length of the moving groove (104). The second lead screw (106) is threadedly connected to the moving seat (105). One end of the second lead screw (106) extends into the adjusting groove (101) and is connected to the first lead screw (102) through a transmission component.

5. The testing device for composite leaf springs according to claim 4, characterized in that, The transmission component includes: The second bevel gear (108) is installed at one end of the second lead screw (106); The first bevel gear (107) is installed on one side of the drive wheel (103), and the first bevel gear (107) meshes with the second bevel gear (108).

6. The testing device for composite material leaf springs according to claim 1, characterized in that, The detection seat (200) includes: The bottom of the detection head (201) and the detection base (200) are provided with a connecting groove, and the detection head (201) is installed in the connecting groove; A power source (203) is installed on the top of the detection base (200), and the power shaft of the power source (203) is connected to the detection head (201); The pressure sensor (202) is mounted on the bottom of the detection seat (200).

7. The testing device for composite leaf springs according to claim 1, characterized in that, The adjusting seat (300) includes: A groove (301) is formed on one side of the adjusting seat (300), and the movable plate (302) is installed in the groove (301); A distance sensor (303) is mounted on the inner wall of the groove (301).

8. The testing device for composite leaf springs according to claim 1, characterized in that, The assembly head (400) includes: An assembly slot (401) is provided on one side of the assembly head (400).

9. The testing device for composite leaf springs according to claim 8, characterized in that, The assembly head (400) also includes: Two clamping heads (402) are provided with mounting slots on both sides of the inner wall of the assembly slot (401), and the two clamping heads (402) are respectively installed in the two mounting slots; Two elastic elements (403) are respectively installed on the inner walls of two mounting slots, and the elastic elements (403) are connected to the clamping head (402).

10. The testing device for composite leaf springs according to claim 4, characterized in that, The movable plate (302) has a rotating shaft installed on the side near the assembly head (400), and the assembly head (400) is rotatably connected to the movable plate (302) via the rotating shaft.

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