A bending stress detection device for composite leaf spring product inspection

Abstract

The utility model relates to the field of composite material plate spring, specifically disclose a kind of bending stress detection equipment for composite material plate spring product inspection, including support frame, still include: two detection seats, along the symmetry distribution of middle axis of support frame;Each detection seat includes: connecting seat, its bottom end is rotatably connected with detection seat by first horizontal pivot, can rotate in the length direction plane of detection seat around first horizontal pivot;Mounting seat is rotatably connected with the top end of connecting seat by second horizontal pivot, can rotate in the length direction plane of detection seat around second horizontal pivot.The utility model in, by adopting the double-rotation coordination structure of connecting seat rotation around first horizontal pivot and mounting seat rotation around second horizontal pivot, the accurate meshing transmission of collocating half gear and rack, can flexibly adjust the linear spacing of two mounting seats under the premise of not disassembling any component.

Description

Technical Field

[0001] This utility model belongs to the field of composite material leaf spring technology, specifically relating to a bending stress testing device for inspecting composite material leaf spring products. Background Technology

[0002] Composite leaf springs, due to their lightweight, corrosion resistance, and excellent fatigue performance, are gradually replacing traditional metal leaf springs as key load-bearing components. Bending stress, as a core indicator for measuring the mechanical properties of composite leaf springs, directly determines their load-bearing capacity and service life. Mainstream composite leaf spring bending stress testing equipment in the industry typically consists of a loading system, a clamping device, a data acquisition module, and environmental control components, providing data support for the design optimization and mass production of composite leaf springs.

[0003] A search revealed that CN108775976B discloses a bending stress testing device for composite automotive leaf spring products, comprising a main housing, an internal testing chamber welded inside the main housing, and a hydraulic cylinder and a stepper motor mounted on the upper outer surface of the testing chamber. Clamps are welded to both sides of the inner surface of the testing chamber, and pre-drilled screw holes penetrate the upper and lower ends of the testing chamber. A hydraulic cylinder has a hydraulic column penetrating its interior. The device comprises two hydraulic cylinders and two stepper motors.

[0004] Because composite leaf springs vary greatly in size under different application scenarios, and the existing equipment fixtures mostly adopt a fixed spacing design, they can only be used for positioning and testing of leaf springs of a single size specification. When it is necessary to test leaf springs of different sizes, the operator must first use special tools to remove the positioning pins, side positioning covers, support screws and other components on the fixture, adjust the support span or clamping spacing of the fixture, and then reassemble and calibrate the centering accuracy of the fixture. The whole adjustment process is cumbersome, consumes a lot of time, and reduces testing efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a bending stress testing device for inspecting composite leaf spring products, in order to solve the problem mentioned in the background art that the clamps of existing devices mostly adopt a fixed spacing design, which can only perform positioning testing on leaf springs of a single size specification.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A bending stress testing device for inspecting composite leaf spring products includes a support frame and further includes: Two testing seats are symmetrically distributed along the central axis of the support frame; Each detection unit includes: The connecting seat has its bottom end rotatably connected to the detection seat via a first horizontal rotating shaft, and can rotate around the first horizontal rotating shaft in the plane along the length of the detection seat. The mounting base is rotatably connected to the top of the connecting base via a second horizontal pivot, and can rotate around the second horizontal pivot in the plane along the length of the detection base. The two ends of the composite material leaf spring are respectively installed in the two mounting bases.

[0007] In one embodiment, the mounting base includes: The mounting groove is located on one side of the mounting base, and the end of the composite material leaf spring is installed in the mounting groove. A clamping assembly, disposed within a mounting slot, is used to clamp and secure the end of the composite leaf spring within the mounting slot.

[0008] In one embodiment, the clamping assembly includes: Two clamping heads are installed in the mounting slot. The two clamping heads are symmetrically arranged and are used to clamp the ends of the composite material leaf spring.

[0009] Preferably, the inner walls on both sides of the mounting groove are provided with first adjustment grooves, and the two clamping heads are respectively installed in the two first adjustment grooves. A second elastic element is installed between the inner wall of the first adjustment groove and the clamping head.

[0010] In one embodiment, the clamping assembly further includes: An abutment is provided between two clamping heads, and a second adjustment groove is provided on one inner wall of the mounting groove, with the abutment disposed in the second adjustment groove; The third elastic element is disposed between the inner wall of the second adjusting groove and the abutment.

[0011] In one embodiment, a limiting groove is provided on the side of the two clamping heads that are close to each other, and a bevel is provided at one end of each clamping head.

[0012] In a preferred embodiment, the detection seat includes: The mounting slot is provided on the test seat, and the connector is installed in the mounting slot.

[0013] In a preferred embodiment, a groove is formed on the inner wall of the mounting slot, a rack is installed in the groove, a half gear is installed at one end of the connecting seat, the half gear meshes with the rack, and a first elastic element is installed at both ends of the rack, with one end of the first elastic element installed on the inner wall of the groove.

[0014] In one embodiment, the support frame includes: Two power sources are mounted on the support frame, and the power shafts of the two power sources are respectively connected to the two detection seats; The top plate is installed on top of the support frame, and a support base is installed at the bottom of the top plate to support the composite material leaf spring.

[0015] In one embodiment, a pressure sensor is installed at the bottom of the detection seat, and the power shaft of the power source is connected to the pressure sensor.

[0016] This invention provides a bending stress testing device for composite leaf spring products. Compared with the prior art, it has the following advantages: It adopts a dual-rotation cooperative structure where the connecting seat rotates around a first horizontal axis and the mounting seat rotates around a second horizontal axis, coupled with the precise meshing transmission of the half-gear and rack. This allows for flexible adjustment of the linear distance between the two mounting seats without disassembling any components. During adjustment, the power source can drive the testing seat to move synchronously or independently for different tests. The first elastic element at both ends of the rack can buffer the adjustment impact and ensure meshing stability, quickly adapting to different sizes according to the actual length of the leaf spring. The second elastic element drives the symmetrical clamping head to move along the first adjustment groove, automatically adapting to leaf spring ends of different widths; the third elastic element pushes the abutment joint to apply longitudinal clamping force to the leaf spring end, accommodating leaf spring contours of different thicknesses or surface curvatures; the inclined surface of the clamping head guides the leaf spring end into the installation position, and the limiting groove can engage and fix it with the outer contour of the leaf spring end. 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 diagram of the detection seat, connecting seat, mounting seat and power source structure proposed in this utility model.

[0020] Figure 4 This is a schematic diagram of the cross-section of the detection seat proposed in this utility model.

[0021] Figure 5 This is a schematic diagram of the cross-section of the mounting base proposed in this utility model.

[0022] The reference numerals in the figure are as follows: 100, detection seat; 101, pressure sensor; 102, groove; 103, rack; 104, first elastic element; 200, connecting seat; 201, half gear; 300, mounting seat; 301, mounting groove; 302, first adjustment groove; 303, clamping head; 304, second elastic element; 305, inclined surface; 306, limiting groove; 307, second adjustment groove; 308, abutment joint; 309, third elastic element; 400, support frame; 401, power source; 402, top plate; 403, support base. Detailed Implementation

[0023] 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.

[0024] Reference Figures 1-5 A bending stress testing device for inspecting composite leaf spring products, comprising a support frame 400, and further comprising: Two detection seats 100 are symmetrically distributed along the central axis of the support frame 400; Each detection unit 100 includes: The connecting seat 200 has its bottom end rotatably connected to the detection seat 100 via a first horizontal rotating shaft, and can rotate around the first horizontal rotating shaft in the plane along the length direction of the detection seat 100. Mounting base 300 is rotatably connected to the top of connecting base 200 via a second horizontal pivot, and can rotate around the second horizontal pivot in the plane along the length of the detection base 100. The two ends of the composite material leaf spring are respectively installed in the two mounting bases 300.

[0025] By coordinating the rotation of the connecting seat 200 around the first horizontal axis and the rotation of the mounting seat 300 around the second horizontal axis, the linear distance between the two mounting seats 300 can be flexibly adjusted without disassembling any components, improving the adaptability efficiency for composite leaf springs of different sizes. At the same time, the rotation adjustment method can adapt to the slight deformation or installation angle requirements that the leaf spring may have during the testing process, ensuring that both ends of the leaf spring can be stably fixed in the mounting seat 300 at different distances, avoiding pre-deformation of the leaf spring caused by forced fixing, and improving the accuracy and reliability of bending stress testing.

[0026] In one embodiment, the mounting base 300 includes: Mounting groove 301 is provided on one side of mounting base 300, and the end of composite material leaf spring is installed in mounting groove 301; A clamping assembly is disposed in the mounting groove 301. The clamping assembly is used to clamp and fix the end of the composite material leaf spring in the mounting groove 301.

[0027] Specifically, the mounting groove 301 provides a clear positioning reference for the end of the composite leaf spring through a preset spatial structure, which can quickly guide the end of the leaf spring into the installation position, reduce the operation time and deviation of manual alignment, and improve installation efficiency; the clamping component can apply a stable clamping force to the end of the leaf spring placed in the mounting groove 301, which can prevent the leaf spring from being displaced or loosened due to the loading force during the bending stress test, and ensure the stability of the test data.

[0028] In one embodiment, the clamping assembly includes: two clamping heads 303, installed in the mounting groove 301, the two clamping heads 303 being symmetrically arranged, and the two clamping heads 303 being used to clamp the ends of the composite material leaf spring; the inner walls on both sides of the mounting groove 301 are provided with first adjustment grooves 302, the two clamping heads 303 are respectively installed in the two first adjustment grooves 302, and a second elastic element 304 is installed between the inner wall of the first adjustment groove 302 and the clamping head 303.

[0029] In the above technical solution, the second elastic element 304 can be a spring or an elastic block. The two symmetrically arranged clamping heads 303, together with the first adjusting groove 302 and the second elastic element 304, can automatically adapt to the ends of composite leaf springs of different widths through the elastic force of the second elastic element 304. It can achieve clamping and fixing of leaf springs of various specifications without manual adjustment or replacement of parts, simplifying the operation process and improving the adaptation efficiency. At the same time, the continuous clamping action formed by the elastic force can compensate for small displacements when the leaf spring is bent under force, avoiding loosening of the clamping. The symmetrically distributed clamping force can ensure that the leaf spring ends are subjected to balanced force, preventing leaf spring deformation or positioning displacement caused by unilateral force. Combined with the positioning function of the mounting groove 301, it improves the stability of the leaf spring fixing and the accuracy of the test data.

[0030] In one embodiment, the clamping assembly further includes: an abutment 308 disposed between two clamping heads 303, a second adjustment groove 307 being provided on one inner wall of the mounting groove 301, and the abutment 308 being disposed within the second adjustment groove 307; and a third elastic member 309 disposed between the inner wall of the second adjustment groove 307 and the abutment 308.

[0031] Specifically, the third elastic element 309 can be a spring or an elastic block. Under the action of the third elastic element 309, the abutment 308 forms a longitudinal clamping force on the end of the composite material leaf spring between the two clamping heads 303, forming a multi-directional synergistic constraint with the lateral clamping force of the two clamping heads 303, preventing the end of the leaf spring from axially moving or deviating in the mounting groove 301. Even when subjected to dynamic loads during bending stress testing, it can still maintain a stable positioning state. The elastic extension and contraction characteristics of the third elastic element 309 can automatically adapt to the leaf spring ends of different thicknesses or surface curvatures, and can compensate for the size differences of the leaf spring ends through elastic force without additional adjustment.

[0032] In one embodiment, a limiting groove 306 is provided on the side of the two clamping heads 303 that are close to each other, and an inclined surface 305 is provided at one end of each clamping head 303.

[0033] The inner wall of the limiting groove 306 can fit the outer contour of the leaf spring end, and restrict the rotation and sliding of the leaf spring in the clamping direction through geometric constraints. Combined with the elastic clamping force of the clamping head 303, the friction constraint of the contact surface is upgraded to a composite constraint of mechanical engagement and friction. The inclined surface 305 at the end of the clamping head 303 is designed with an inclination angle of 15°-45°. When the leaf spring end contacts the inclined surface 305, the downward or pushing force of the leaf spring will be decomposed into a component force along the inclined surface 305, which pushes the two clamping heads 303 to move to both sides along the first adjusting groove 302 and compresses the second elastic element 304, realizing the automatic opening of the clamping head 303. After the leaf spring end crosses the inclined surface 305 and enters the area of ​​the limiting groove 306, the clamping head 303 is reset under the action of the second elastic element 304, so that the limiting groove 306 and the leaf spring end are precisely engaged.

[0034] In a preferred embodiment, the detection seat 100 includes: a mounting groove 301 formed on the detection seat 100, and a connecting seat 200 installed in the mounting groove 301; a groove 102 is formed on the inner wall of the mounting groove 301, a rack 103 is installed in the groove 102, a half gear 201 is installed at one end of the connecting seat 200, the half gear 201 meshes with the rack 103, and a first elastic element 104 is installed at both ends of the rack 103, with one end of the first elastic element 104 installed on the inner wall of the groove 102.

[0035] Specifically, the first elastic element 104 can be a spring or an elastic block. Through the meshing of the half gear 201 and the rack 103, the rotation adjustment of the connecting seat 200 in the mounting groove 301 is more precise and controllable, avoiding jamming or offset during rotation and ensuring the stability of the angle adjustment of the connecting seat 200. At the same time, the first elastic elements 104 at both ends of the rack 103 can generate elastic buffer when the half gear 201 drives the rack 103 to move. This reduces the impact force during adjustment to protect the meshing structure, and after adjustment, the elastic restoring force helps the half gear 201 and the rack 103 maintain a stable meshing state, preventing loosening of the meshing due to vibration or load.

[0036] In one embodiment, the support frame 400 includes: Two power sources 401 are mounted on the support frame 400, and the power shafts of the two power sources 401 are respectively connected to the two detection seats 100; A top plate 402 is installed on top of the support frame 400, and a support base 403 is installed at the bottom of the top plate 402. The support base 403 is used to support the composite material leaf spring. A pressure sensor 101 is installed at the bottom of the detection seat 100, and the power shaft of the power source 401 is connected to the pressure sensor 101.

[0037] The two power sources 401 can be servo motors or hydraulic motors, which are connected to the detection seat 100 of the detection seat 100 through the power shaft, so as to realize the synchronous or independent adjustment of the two detection seats 100 to meet diverse detection needs; the top plate 402 serves as the mounting carrier of the support seat 403, ensuring that the loading point of the support seat 403 on the leaf spring is at the mechanical center. The contact surface of the support seat 403 is designed to be arc-shaped or adapted to the shape of the leaf spring surface to reduce local stress concentration.

[0038] During use, align the two ends of the leaf spring to be tested with the mounting slots 301 of the two mounting seats 300 respectively. The end of the leaf spring first contacts the inclined surface 305 at the end of the clamping head 303. Apply a slight pushing force along the inclined surface 305. The component force of the inclined surface 305 pushes the two symmetrical clamping heads 303 to move to both sides along the first adjusting groove 302, simultaneously compressing the second elastic element 304. Continue pushing the end of the leaf spring until it passes the inclined surface 305 and enters the limiting groove 306 inside the clamping head 303. At this time, the second elastic element 304... When component 304 resets, it causes the clamping head 303 to tighten, and the limiting groove 306 engages with the outer contour of the leaf spring end to form a lateral constraint. At the same time, under the action of the third elastic element 309, the abutment 308 in the mounting groove 301 applies a longitudinal clamping force from between the two clamping heads 303 toward the end of the leaf spring, completing single-end fixing. Repeating the above operation, the other end of the leaf spring is fixed to another mounting base 300, realizing multi-directional elastic fixing of both ends of the leaf spring, until the distance between the two mounting bases 300 is completely adapted to the length of the leaf spring. The bending stress loading program is started, and the detection seat 100 is moved by the power source 401. The detection seat 100 applies a preset load to the end of the leaf spring. During the loading process, the pressure sensor 101 collects the force signal transmitted by the power shaft in real time, and the data acquisition system records the load change and leaf spring bending deformation data simultaneously.

[0039] 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 bending stress testing device for inspecting composite leaf spring products, comprising a support frame (400), characterized in that, Also includes: Two detection seats (100) are symmetrically distributed along the central axis of the support frame (400); Each detection port (100) includes: The connecting seat (200) has its bottom end rotatably connected to the detection seat (100) via a first horizontal rotating shaft, and can rotate around the first horizontal rotating shaft in the plane along the length direction of the detection seat (100); The mounting base (300) is rotatably connected to the top of the connecting base (200) via the second horizontal pivot, and can rotate around the second horizontal pivot in the plane of the length direction of the detection base (100). The two ends of the composite material leaf spring are respectively installed in the two mounting bases (300).

2. The bending stress testing equipment for composite material leaf spring products according to claim 1, characterized in that, The mounting base (300) includes: The mounting groove (301) is provided on one side of the mounting base (300), and the end of the composite material leaf spring is installed in the mounting groove (301); A clamping assembly is provided in the mounting groove (301) for clamping and fixing the end of the composite leaf spring in the mounting groove (301).

3. The bending stress testing equipment for composite material leaf spring products according to claim 2, characterized in that, The clamping assembly includes: Two clamping heads (303) are installed in the mounting groove (301). The two clamping heads (303) are symmetrically arranged and are used to clamp the ends of the composite material leaf spring.

4. The bending stress testing equipment for composite material leaf spring products according to claim 3, characterized in that, The inner walls on both sides of the mounting groove (301) are provided with first adjustment grooves (302), and two clamping heads (303) are respectively installed in the two first adjustment grooves (302). A second elastic element (304) is installed between the inner wall of the first adjustment groove (302) and the clamping head (303).

5. The bending stress testing equipment for composite material leaf spring products according to claim 3, characterized in that, The clamping assembly further includes: An abutment (308) is disposed between two clamping heads (303). A second adjustment groove (307) is provided on one inner wall of the mounting groove (301), and the abutment (308) is disposed in the second adjustment groove (307). The third elastic element (309) is disposed between the inner wall of the second adjusting groove (307) and the abutment (308).

6. The bending stress testing equipment for composite material leaf spring products according to claim 3, characterized in that, Limiting grooves (306) are provided on the side of the two clamping heads (303) that are close to each other, and a bevel (305) is provided at one end of each clamping head (303).

7. The bending stress testing equipment for composite material leaf spring products according to claim 1, characterized in that, The detection seat (100) includes: The mounting slot (301) is provided on the detection seat (100), and the connecting seat (200) is installed in the mounting slot (301).

8. The bending stress testing equipment for composite material leaf spring products according to claim 7, characterized in that, The inner wall of the mounting groove (301) is provided with a groove (102), a rack (103) is installed in the groove (102), a half gear (201) is installed at one end of the connecting seat (200), the half gear (201) meshes with the rack (103), and a first elastic element (104) is installed at both ends of the rack (103), one end of the first elastic element (104) is installed on the inner wall of the groove (102).

9. The bending stress testing equipment for composite material leaf spring products according to claim 1, characterized in that, The support frame (400) includes: Two power sources (401) are mounted on a support frame (400), and the power shafts of the two power sources (401) are respectively connected to two detection seats (100); A top plate (402) is installed on top of a support frame (400), and a support seat (403) is installed at the bottom of the top plate (402) for supporting the composite leaf spring.

10. The bending stress testing equipment for composite material leaf spring products according to claim 9, characterized in that, A pressure sensor (101) is installed at the bottom of the detection seat (100), and the power shaft of the power source (401) is connected to the pressure sensor (101).

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