Carbon fiber unidirectional resin composite board bending fatigue test device and method

Abstract

The invention discloses a carbon fiber one-way resin composite board bending fatigue test device and method, the carbon fiber one-way resin composite board bending fatigue test device comprises a seat plate, two end portion limiting assemblies and a carbon fiber composite sample plate, and a lifting extrusion platform is arranged at the top of the seat plate and located between the two end portion limiting assemblies. According to the bending fatigue test device and method for the carbon fiber one-way resin composite plate, through the arrangement of the seat plate, the end limiting assembly, the lifting extrusion platform and the two upper extrusion rods, after the two ends of a carbon fiber composite sample plate are limited, the two upper extrusion rods can be used for achieving a multi-point bending extrusion test on the carbon fiber composite sample plate; and by matching with the arrangement of the bottom extrusion assembly and the linkage assembly, the lower part of the carbon fiber composite sample plate can be extruded when the upper part of the carbon fiber composite sample plate is extruded, so that the multi-point bending fatigue test of the carbon fiber composite sample plate is more comprehensively realized.

Description

Technical Field

[0001] The invention relates to the technical field of plate performance testing, and in particular to a carbon fiber unidirectional resin composite plate bending fatigue test device and method. Background Art

[0002] Carbon fiber composite materials refer to structural or functional materials made by compounding materials such as resin, metal, ceramic and rubber as the matrix and carbon fiber as the reinforcement material. According to the different matrix materials, carbon fiber composite materials can be divided into resin-based composite materials, metal-based composite materials, ceramic-based composite materials and rubber-based composite materials. Among them, resin-based composite materials refer to composite materials made of resin as the matrix and carbon fiber as the reinforcement material.

[0003] Military fields such as aerospace and weapons industry, as well as civil fields such as petrochemicals, wind power generation, and lightweight automobiles have extremely high requirements for the mechanical properties of carbon fiber reinforced resin-based composite materials. Carbon fiber reinforced resin-based composite materials are inevitably subject to extremely complex loads during their application in the above fields, so it is necessary to test the bending fatigue resistance of carbon fiber reinforced resin-based composite materials.

[0004] The existing bending fatigue load test equipment and methods are single and limited to the central single-point bending fatigue test of the carbon fiber unidirectional resin composite plate, and lack multi-point bending fatigue test of the carbon fiber unidirectional resin composite plate at different frequencies. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a carbon fiber unidirectional resin composite plate bending fatigue test device and method, which solves the above-mentioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a carbon fiber unidirectional resin composite plate bending fatigue test device, comprising a seat plate, end limit assemblies arranged on both sides of the top of the seat plate, and a carbon fiber composite sample plate arranged between the two end limit assemblies, a lifting and extrusion platform is arranged on the top of the seat plate and between the two end limit assemblies, two upper extrusion rods are arranged on the lifting and extrusion platform, a bottom extrusion assembly is arranged on the bottom of the lifting and extrusion platform, the bottom extrusion assembly is arranged between the two upper extrusion rods, and the bottom extrusion assembly is arranged below the carbon fiber composite sample plate, the two upper extrusion rods are arranged above the carbon fiber composite sample plate, and the lifting and extrusion platform and the bottom extrusion assembly are connected through a linkage assembly; The end limit assembly includes a support and a mounting frame, one side of the seat plate is provided with a loading and unloading turning mechanism, and the top of the support is provided with a material conveying mechanism; The material conveying mechanism comprises a plurality of conveying rollers rotatably mounted on the top of a support, the plurality of conveying rollers are equidistantly arranged in parallel, and the plurality of conveying rollers are driven to rotate synchronously by a driving box, and the driving box inputs power through a first rotating motor.

[0007] The present invention is further configured as follows: the lifting and extruding platform comprises an inverted U-shaped bracket, the top of the inverted U-shaped bracket is fixedly connected to a first hydraulic telescopic rod, the telescopic end of the first hydraulic telescopic rod passes through the inverted U-shaped bracket and is fixedly connected to a push plate, and the front and rear sides of the bottom of the push plate are fixedly connected to a cross plate; The inverted U-shaped bracket is fixedly connected to the middle part of the top of the seat plate, and the two upper extrusion rods are respectively fixedly installed on the opposite side of the horizontal plate in the two cross plates.

[0008] The present invention is further configured as follows: the end limit assembly comprises a support and a mounting frame, the top of the mounting frame is fixedly connected to a second hydraulic telescopic rod, the telescopic end of the second hydraulic telescopic rod passes through the mounting frame and is fixedly connected to a limit plate, and the limit plate is arranged directly above the support; The two supports are respectively fixedly mounted on the two sides of the top of the seat plate, and the two mounting frames are respectively fixedly connected to the two sides of the inverted U-shaped bracket.

[0009] The present invention is further configured as follows: the bottom extrusion assembly includes two tooth plates, a mounting frame is fixedly connected between opposite sides of the two tooth plates, a third hydraulic telescopic rod is fixedly connected to the bottom of the mounting frame, the telescopic end of the third hydraulic telescopic rod passes through the mounting frame and is fixedly connected to the lower extrusion rod.

[0010] The present invention is further configured as follows: the linkage assembly includes a gear, a plurality of mating teeth are fixedly connected to the opposite side of the vertical plates of the two cross plates, the gear is arranged between the cross plate and the tooth plate, and meshes with the tooth plate and the mating teeth; The gear is rotatably mounted on the top of the seat plate through two auxiliary plates, and opposite sides of the two auxiliary plates are respectively in sliding contact with the butting teeth and the two sides of the tooth plate.

[0011] The present invention is further configured as follows: two first auxiliary rods are fixedly connected to the top of the push plate, and the top ends of the two first auxiliary rods both penetrate the inverted U-shaped bracket and extend above it; The bottom of the lower extrusion rod is fixedly connected to two second auxiliary rods, and the bottom ends of the two second auxiliary rods both penetrate the installation frame and extend to the bottom thereof.

[0012] The present invention is further configured as follows: a sliding block is fixedly connected to one side of the two cross plates facing away from each other, and a sliding groove matching the sliding block is provided on the surface of the inverted U-shaped bracket.

[0013] The present invention is further configured as follows: the loading and unloading turning mechanism comprises a base, a vertical support is fixed on the top of the base, a lifting block is movably installed on the vertical support through a vertical slide rail, the lifting block is driven to lift and move by a lifting drive mechanism, a connecting shaft is rotatably installed on the lifting block, a first connecting frame is fixed on the end of the connecting shaft away from the lifting block, a second connecting frame is provided on the side of the first connecting frame away from the connecting shaft, a first push rod motor is provided between the first connecting frame and the second connecting frame, two auxiliary supporting frames are symmetrically provided on the side of the second connecting frame away from the second connecting frame, support rollers are rotatably installed on the sides of the two auxiliary supporting frames close to each other, and a clamping mechanism is also provided on the second connecting frame; The clamping mechanism comprises a clamping plate, and the clamping plate is driven to move up and down by a second push rod motor.

[0014] The present invention is further configured as follows: a horizontal slide rail is fixed to one side of the vertical support, two limit rods are fixed to one side of the lifting block away from the first connecting frame, one end of the connecting shaft passes through the lifting block and extends to one side of the limit rod, and a first connecting rod is fixed to the bottom end of the lifting block, a second connecting rod is fixed, a spring is connected between the first connecting rod and the second connecting rod, the first connecting rod is clamped at the top end of the limit rod by the tension of the spring, a flip guide is fixed to the outside of the connecting shaft on the side of the lifting block away from the limit rod, and a flip guide mechanism is slidably installed on the horizontal slide rail; Two levers are fixed on the flip guide member, and the flip guide mechanism includes two symmetrically arranged shift levers, a horizontal bending portion is provided on the side where the top ends of the shift levers are close to each other, a guide wedge block is provided between the two shift levers, and guide inclined surfaces are provided on both sides of the guide wedge block.

[0015] The present invention is further configured as follows: The present invention also discloses a carbon fiber unidirectional resin composite plate bending fatigue test method, which specifically comprises the following steps: Step 1: insert the carbon fiber composite sample from the side between the two auxiliary support frames, control the first push rod motor to extend, push the carbon fiber composite sample toward the top of the support, so that the carbon fiber composite sample is placed on the top of the conveying roller by gravity, and the carbon fiber composite sample is conveyed to the top of the support by driving the conveying roller to rotate; Step 2: Record the initial state of the carbon fiber composite sample, place the carbon fiber composite sample above the two supports, start the second hydraulic telescopic rod, and push the limit plate close to the top of the carbon fiber composite sample. When the limit plate is 0.1-1 cm away from the top of the carbon fiber composite sample, stop the extension of the second hydraulic telescopic rod; Step 3, control the extension of the first hydraulic telescopic rod, the first hydraulic telescopic rod pushes the push plate to make the two cross plates descend, the cross plates drive the two upper extrusion rods to descend, and the top of the carbon fiber composite sample is extruded. During the process, the cross plate drives the docking teeth to rotate the gear, the gear drives the tooth plate to rise, the tooth plate drives the mounting frame to make the third hydraulic telescopic rod rise, the third hydraulic telescopic rod drives the lower extrusion rod to rise, so that the lower extrusion rod extrudes the bottom of the carbon fiber composite sample, and realizes the three-point extrusion bending of the carbon fiber composite sample; Step 4: Control the first hydraulic telescopic rod to reset, so that the upper extrusion rod and the lower extrusion rod are separated from the carbon fiber composite sample; Step 5, repeat the operations of step 2 and step 3 several times to complete the bending fatigue test of the carbon fiber composite sample, observe the state of the carbon fiber composite sample at this time, and compare it with the initial state of the carbon fiber composite sample; Step 6: When the height of the lower extrusion rod needs to be adjusted, the third hydraulic telescopic rod is controlled to be extended or retracted.

[0016] The present invention provides a carbon fiber unidirectional resin composite plate bending fatigue test device and method. It has the following beneficial effects: (1) The present invention adopts the arrangement of a seat plate, an end limit assembly, a lifting extrusion platform and two upper extrusion rods. After limiting the two ends of the carbon fiber composite sample, the two upper extrusion rods can be used to realize a multi-point bending extrusion test of the carbon fiber composite sample. In combination with the arrangement of the bottom extrusion assembly and the linkage assembly, when the upper part of the carbon fiber composite sample is extruded, the lower part of the carbon fiber composite sample can also be extruded, thereby realizing a more comprehensive multi-point bending fatigue test of the carbon fiber composite sample.

[0017] (2) The present invention achieves the purpose of performing multi-point bending fatigue tests at different frequencies on the carbon fiber composite sample by adjusting the extension and retraction of the third hydraulic telescopic rod during the overall lifting and lowering process of the bottom extrusion assembly through the coordinated arrangement of the tooth plate, the mounting frame, the third hydraulic telescopic rod and the lower extrusion rod.

[0018] (3) The present invention can realize automatic lifting and feeding by setting up a loading and unloading flipping mechanism through the coordinated work of various components, which is more efficient and easier than manual handling; and during the test process, the carbon fiber composite sample can be conveniently flipped 180 degrees and tested again. It only needs to drive the flipping guide to move up and down to drive the carbon fiber composite sample to rise and fall and flip. The device runs stably and can maintain a horizontal state every time the sample reaches the highest point, effectively improving the efficiency of loading and unloading and flipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2It is a schematic diagram of the connection between the seat plate, the end stop assembly and the carbon fiber composite template structure of the present invention; Figure 3 It is a schematic diagram of the connection between the lifting extrusion platform and the upper extrusion rod structure of the present invention; Figure 4 It is a schematic structural diagram of the bottom extrusion assembly of the present invention; Figure 5 It is a structural schematic diagram of the linkage assembly of the present invention; Figure 6 It is a schematic diagram of the relative positions of the loading and unloading turning mechanism and the top support of the seat plate of the present invention; Figure 7 It is a schematic diagram of the structure of the loading and unloading turning mechanism of the present invention; Figure 8 for Figure 6 A zoomed-in detail of position A in the middle; Fig. 9 It is a front view of the top part of the base of the present invention; Fig.10 It is an enlarged stereoscopic view of the position of the first connecting frame of the present invention; Fig.11 It is a right side view of the top part of the base of the present invention; Fig.12 A three-dimensional view of the top part of the base of the present invention from an oblique upper perspective; Fig.13 This is an enlarged detail view of the lifting block of the present invention from the first perspective; Fig.14 This is an enlarged detail view of the lifting block of the present invention from a second viewing angle; Fig.15 This is a working principle diagram of the first downward movement stage of the loading and unloading turning mechanism of the present invention; Fig.16 This is a working principle diagram of the first upward movement stage when the loading and unloading turning mechanism of the present invention is working; Fig.17 It is a working principle diagram of the second downward movement stage when the loading and unloading turning mechanism of the present invention is working; Fig.18 This is a working principle diagram of the second upward movement stage when the loading and unloading turning mechanism of the present invention is working.

[0020] In the figure, 1, seat plate; 2, end limit assembly; 3, carbon fiber composite sample; 4, lifting extrusion platform; 5, upper extrusion rod; 6, bottom extrusion assembly; 7, linkage assembly; 8, inverted U-shaped bracket; 9, first hydraulic telescopic rod; 10, push plate; 11, cross plate; 12, support; 1201, conveying roller; 1202, drive box; 1203, first rotating motor; 13, mounting frame; 14, second hydraulic telescopic rod; 15, limit plate; 16, tooth plate; 17, mounting frame; 18, third hydraulic telescopic rod; 19, lower extrusion rod; 20, gear; 21, docking tooth; 22, auxiliary plate; 23, first auxiliary rod; 24, second auxiliary rod; 25, slider; 26, slide groove; 27, Loading and unloading turning mechanism; 2701, base; 2702, vertical support; 2703, vertical slide rail; 2704, lifting block; 2705, connecting shaft; 2706, first connecting frame; 2707, second connecting frame; 2708, first push rod motor; 2709, auxiliary support frame; 2710, support roller; 2711, lifting plate; 2712, threaded rod; 2713, rotating motor; 2714, second push rod motor; 2715, clamping plate; 2716, horizontal slide rail; 2717, gear lever; 2718, guide wedge block; 2719, turning guide; 2720, first connecting rod; 2721, second connecting rod; 2722, spring; 2723, limit rod; 2724, shift rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] See also Figure 1-18 , the embodiment of the present invention provides the following technical solutions: Example 1

[0023] A carbon fiber unidirectional resin composite plate bending fatigue test device comprises a seat plate 1, end limit assemblies 2 arranged on both sides of the top of the seat plate 1, a carbon fiber composite sample 3 arranged between the two end limit assemblies 2, a lifting extrusion platform 4, and two upper extrusion rods 5.

[0024] As a preferred solution, in order to support the carbon fiber composite sample 3, the end limit assembly 2 includes a support 12, and the two supports 12 are fixedly installed on both sides of the top of the seat plate 1 respectively.

[0025] As a preferred solution, in order to realize multi-point extrusion bending test of the carbon fiber composite sample 3, the lifting extrusion platform 4 includes an inverted U-shaped bracket 8, and the top of the inverted U-shaped bracket 8 is fixedly connected to a first hydraulic telescopic rod 9, and the first hydraulic telescopic rod 9 is electrically connected to an external power supply and controlled by a control switch. The telescopic end of the first hydraulic telescopic rod 9 passes through the inverted U-shaped bracket 8 and is fixedly connected to a push plate 10. The front and rear sides of the bottom of the push plate 10 are fixedly connected to a cross plate 11, and the cross plate 11 consists of a horizontal plate portion and a vertical plate portion. The inverted U-shaped bracket 8 is fixedly connected to the middle part of the top of the seat plate 1, and the two upper extrusion rods 5 are respectively fixedly installed on the opposite side of the horizontal plate of the two cross plates 11, and the two upper extrusion rods 5 are both arranged above the carbon fiber composite sample 3.

[0026] Further explanation, in order to ensure the stability of the movement of the push plate 10, two first auxiliary rods 23 are fixedly connected to the top of the push plate 10, and the top ends of the two first auxiliary rods 23 both penetrate the inverted U-shaped bracket 8 and extend above it.

[0027] Furthermore, in order to ensure the stability of the cross plate 11 during movement, sliders 25 are fixedly connected to the opposite sides of the two cross plates 11 , and a sliding groove 26 adapted to the slider 25 is provided on the surface of the inverted U-shaped bracket 8 .

[0028] As a preferred solution, in order to limit the end of the carbon fiber composite sample 3 when it is extruded, the end limit assembly 2 also includes a mounting frame 13, and a second hydraulic telescopic rod 14 is fixedly connected to the top of the mounting frame 13. The second hydraulic telescopic rod 14 is electrically connected to an external power supply and is controlled by a control switch. The telescopic end of the second hydraulic telescopic rod 14 passes through the mounting frame 13 and is fixedly connected to a limit plate 15. The limit plate 15 is arranged directly above the support 12, and the two mounting frames 13 are respectively fixedly connected to the two sides of the inverted U-shaped bracket 8.

[0029] In this embodiment, the contact and separation of the upper extrusion rod 5 and the carbon fiber composite sample 3 can be achieved by telescoping the first hydraulic telescopic rod 9, thereby providing convenient conditions for the bending fatigue test of the carbon fiber composite sample 3. Example 2

[0030] This embodiment is an improvement of the previous embodiment. It is a carbon fiber unidirectional resin composite plate bending fatigue test device, and also includes a bottom extrusion assembly 6 and a linkage assembly 7 arranged inside the rising inverted U-shaped bracket 8. The bottom extrusion assembly 6 is arranged below the carbon fiber composite sample 3, wherein the bottom extrusion assembly 6 is arranged between two upper extrusion rods 5, and the bottom extrusion assembly 6 includes two tooth plates 16, and a mounting frame 17 is fixedly connected between the opposite sides of the two tooth plates 16. A third hydraulic telescopic rod 18 is fixedly connected to the bottom of the mounting frame 17. The third hydraulic telescopic rod 18 is electrically connected to an external power supply and is controlled by a control switch. The telescopic end of the third hydraulic telescopic rod 18 passes through the mounting frame 17 and is fixedly connected to a lower extrusion rod 19. The end stop assembly 2 includes a support 12 and a mounting frame 13. A loading and unloading turning mechanism 27 is provided on one side of the seat plate 1, and a material conveying mechanism is provided on the top of the support 12. The material conveying mechanism includes a plurality of conveying rollers 1201 rotatably mounted on the top of a support 12 . The plurality of conveying rollers 1201 are equidistantly arranged in parallel and driven to rotate synchronously by a driving box 1202 . The driving box 1202 inputs power through a first rotating motor 1203 .

[0031] Further explanation: in order to ensure the stability of the lower extrusion rod 19 during movement, two second auxiliary rods 24 are fixedly connected to the bottom of the lower extrusion rod 19, and the bottom ends of the two second auxiliary rods 24 both penetrate the mounting frame 17 and extend to the bottom thereof.

[0032] As a preferred solution, in order to realize the reciprocating extrusion of the carbon fiber composite template 3 by the bottom extrusion assembly 6, the linkage assembly 7 includes a gear 20, which is rotatably installed on the top of the seat plate 1 through two auxiliary plates 22. A plurality of docking teeth 21 are fixedly connected to the opposite side of the vertical plates in the two cross plates 11. The gear 20 is arranged between the cross plate 11 and the tooth plate 16, and meshes with the tooth plate 16 and the docking teeth 21, and the opposite sides of the two auxiliary plates 22 are in sliding contact with the docking teeth 21 and the two sides of the tooth plate 16 respectively.

[0033] The advantage of the second embodiment over the first embodiment is that it can realize bending tests at more points and also realize bending fatigue tests at multiple points with different frequencies. Example 3

[0034] As a preferred solution, the end stop assembly 2 includes a support 12 and a mounting frame 13, a loading and unloading turning mechanism 27 is provided on one side of the seat plate 1, and a material conveying mechanism is provided on the top of the support 12; The material conveying mechanism includes a plurality of conveying rollers 1201 rotatably mounted on the top of the support 12, the plurality of conveying rollers 1201 are equidistantly arranged in parallel, and the plurality of conveying rollers 1201 are driven to rotate synchronously by a driving box 1202, and the driving box 1202 inputs power through a first rotating motor 1203; When the carbon fiber composite sample 3 is located at the top of the support 12, due to gravity, rolling friction is generated between the bottom end of the carbon fiber composite sample 3 and the conveying roller 1201. When multiple conveying rollers 1201 rotate synchronously, the carbon fiber composite sample 3 can be driven to be conveyed at the top of the support 12.

[0035] The loading and unloading turning mechanism 27 includes a base 2701, a vertical support 2702 is fixed on the top of the base 2701, a lifting block 2704 is movably installed on the vertical support 2702 through a vertical slide rail 2703, the lifting block 2704 is driven to move up and down by a lifting drive mechanism, a connecting shaft 2705 is rotatably installed on the lifting block 2704, a first connecting frame 2706 is fixed on the end of the connecting shaft 2705 away from the lifting block 2704, a second connecting frame 2707 is provided on the side of the first connecting frame 2706 away from the connecting shaft 2705, a first push rod motor 2708 is provided between the first connecting frame 2706 and the second connecting frame 2707, two auxiliary support frames 2709 are symmetrically provided on the side of the second connecting frame 2707 away from the second connecting frame 2707, and the two auxiliary support frames 2709 are rotatably installed on the sides close to each other. There are support rollers 2710, and the second connecting frame 2707 is also provided with a clamping mechanism. The lifting block 2704 can be driven to lift and move through the lifting drive mechanism, and then the carbon fiber composite template 3 clamped between the two auxiliary support frames 2709 can be driven to lift and move, so as to achieve the purpose of automatic lifting and feeding. Compared with manual handling, it is more efficient and easy. When loading, the auxiliary support frame 2709 is moved to a lower position, and then the carbon fiber composite template 3 is inserted from the side between the two auxiliary support frames 2709, and then the carbon fiber composite template 3 is pushed toward the support 12 by the first push rod motor 2708, so that one end of the carbon fiber composite template 3 is placed on the top of the support 12 due to gravity. When lifting and flipping the carbon fiber composite template 3, the first push rod motor 2708 is in a shortened state to ensure that the carbon fiber composite template 3 will not interfere with the support 12.

[0036] The driving mechanism includes a threaded rod 2712, and a lifting plate 2711 is fixed to one side of the lifting block 2704. The threaded rod 2712 penetrates the lifting plate 2711 through a threaded hole, and the threaded rod 2712 is driven to rotate by a rotating motor 2713. The rotation of the threaded rod 2712 can drive the lifting plate 2711 to move up and down, thereby driving the lifting block 2704 to move up and down.

[0037] The clamping mechanism includes a clamping plate 2715, which is driven to move up and down by a second push rod motor 2714. The clamping mechanism is used to clamp and fix the carbon fiber composite template 3. After the clamping plate 2715 is driven by the second push rod motor 2714 to clamp the carbon fiber composite template 3, the carbon fiber composite template 3 can be pulled away from the top of the support 12, and when the carbon fiber composite template 3 is flipped, it can be ensured that the carbon fiber composite template 3 will not slide from the side. Example 4

[0038] As a preferred solution, a horizontal slide rail 2716 is fixed to one side of the vertical support 2702, two limit rods 2723 are fixed to one side of the lifting block 2704 away from the first connecting frame 2706, one end of the connecting shaft 2705 passes through the lifting block 2704 and extends to one side of the limit rod 2723, and is fixed with a first connecting rod 2720, a second connecting rod 2721 is fixed to the bottom end of the lifting block 2704, a spring 2722 is connected between the first connecting rod 2720 and the second connecting rod 2721, the first connecting rod 2720 is clamped at the top end of the limit rod 2723 by the pulling force of the spring 2722, a flip guide 2719 is fixed to the outside of the connecting shaft 2705 on the side of the lifting block 2704 away from the limit rod 2723, and a flip guide mechanism is slidably installed on the horizontal slide rail 2716; Two levers 2724 are fixed on the flip guide 2719, and the flip guide mechanism includes two symmetrically arranged levers 2717, and a horizontal bending portion is provided on the side where the top ends of the levers 2717 are close to each other. A guide wedge block 2718 is provided between the two levers 2717, and guide inclined surfaces are provided on both sides of the guide wedge block 2718.

[0039] When testing the carbon fiber composite sample 3, in order to better perform the bending fatigue test, it is necessary to flip the carbon fiber composite sample 3 180 degrees after testing for a period of time, and then test it again. At this time, the carbon fiber composite sample 3 is transported back to between the two auxiliary support frames 2709 through the material conveying mechanism, and then the lifting block 2704 is driven to move downward, such as Fig.15In the state a shown in the figure, the flip guide 2719 can just pass through the gap between the top ends of the two gear rods 2717. After moving downward to the state b, at this time, a lower lever 2724 on the flip guide 2719 contacts the right inclined surface of the guide wedge 2718. The flip guide 2719 continues to descend and pushes the guide wedge 2718 to move left, thereby driving the two levers 2724 to move a distance to the left as a whole (at this time, the flip guide 2719 has a tendency to rotate clockwise under force, but due to the obstruction of the first connecting rod 2720 by the limit rod 2723 on the other side, the lifting block 2704 will not rotate clockwise. In the current state, the lifting block 2704 is 704 can only rotate counterclockwise), moves to state c, and then the flip guide 2719 moves upward and returns to state d. At this time, since the two levers 2724 move a distance to the left as a whole, the gear lever 2717 on the right will block the lever 2724 above the flip guide 2719, thereby pushing the flip guide 2719 to rotate counterclockwise. The flip guide 2719 moves upward, and the flip guide 2719 rotates counterclockwise, transitioning from state e to state f. When the critical value is reached (the first connecting rod 2720 on the back rotates to a vertical state and deviates to another limit rod 2723), the tension of the spring 2722 pulls the first The connecting rod 2720 falls on the top of another limit rod 2723. At this time, the flip guide 2719 flips 180 degrees counterclockwise, which can drive the carbon fiber composite sample 3 to flip 180 degrees counterclockwise, thereby reaching the g state. At this time, when the flip guide 2719 is driven to move downward, the flip guide 2719 can just pass through the gap between the tops of the two shift rods 2717 after the movement. When the flip guide 2719 continues to move downward, it will pass through the h and i states, and the operation principle will be the same as the previous downward movement cycle, except that the two levers 2724 will be pushed to move a distance to the right as a whole. When the flip guide 2719 continues to return upward, After the j, k and l states, the operating principle is the same as the previous upward movement cycle, except that it will drive the flipping guide 2719 to rotate 180 degrees clockwise, and then drive the carbon fiber composite template 3 to flip 180 degrees clockwise. Therefore, it is only necessary to drive the flipping guide 2719 to move up and down and reciprocate. Each time the carbon fiber composite template 3 reaches the final position, it will flip once, so that the purpose of driving the carbon fiber composite template 3 to lift and flip can be achieved through the power input of only one rotating motor 2713, and the device runs stably. Each time the carbon fiber composite template 3 reaches the highest point, it will remain in a horizontal state, which improves the efficiency of loading and unloading and flipping the carbon fiber composite template 3. Example 5

[0040] A carbon fiber unidirectional resin composite plate bending fatigue test method specifically comprises the following steps: Step 1: insert the carbon fiber composite sample 3 from the side between the two auxiliary support frames 2709, control the first push rod motor 2708 to extend, push the carbon fiber composite sample 3 toward the top of the support 12, so that the carbon fiber composite sample 3 is placed on the top of the conveying roller 1201 by gravity, and the carbon fiber composite sample 3 is conveyed to the top of the support 12 by driving the conveying roller 1201 to rotate; Step 2, record the initial state of the carbon fiber composite sample 3, place the carbon fiber composite sample 3 above the two supports 12, start the second hydraulic telescopic rod 14, the second hydraulic telescopic rod 14 pushes the limit plate 15 close to the top of the carbon fiber composite sample 3, and when the limit plate 15 is 0.1-1 cm away from the top of the carbon fiber composite sample 3, stop the extension of the second hydraulic telescopic rod 14; Step 3, control the first hydraulic telescopic rod 9 to extend, the first hydraulic telescopic rod 9 pushes the push plate 10 to make the two cross plates 11 descend, the cross plates 11 drive the two upper extrusion rods 5 to descend, and the top of the carbon fiber composite sample 3 is extruded. During the process, the cross plate 11 drives the docking teeth 21 to rotate the gear 20, the gear 20 drives the tooth plate 16 to rise, the tooth plate 16 drives the mounting frame 17 to make the third hydraulic telescopic rod 18 rise, the third hydraulic telescopic rod 18 drives the lower extrusion rod 19 to rise, so that the lower extrusion rod 19 squeezes the bottom of the carbon fiber composite sample 3, and realizes the three-point extrusion bending of the carbon fiber composite sample 3; Step 4: Control the first hydraulic telescopic rod 9 to reset, so that the upper extrusion rod 5 and the lower extrusion rod 19 are separated from the carbon fiber composite sample 3; Step 5, repeat the operations of step 2 and step 3 several times to complete the bending fatigue test on the carbon fiber composite sample 3, observe the state of the carbon fiber composite sample 3 at this time, and compare it with the initial state of the carbon fiber composite sample 3; Step 6: When a bending fatigue test at multiple points and different frequencies is required, the third hydraulic telescopic rod 18 is controlled to be telescopic and the height of the lower extrusion rod 19 is adjusted.

[0041] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A carbon fiber unidirectional resin composite plate bending fatigue test device, comprising a seat plate (1), end stopper assemblies (2) arranged on both sides of the top of the seat plate (1), and a carbon fiber composite sample plate (3) arranged between the two end stopper assemblies (2), characterized in that: A lifting extrusion platform (4) is arranged at the top of the seat plate (1) and between the two end limit assemblies (2); two upper extrusion rods (5) are arranged on the lifting extrusion platform (4); a bottom extrusion assembly (6) is arranged at the bottom of the lifting extrusion platform (4); the bottom extrusion assembly (6) is arranged between the two upper extrusion rods (5), and the bottom extrusion assembly (6) is arranged below the carbon fiber composite sample (3); the two upper extrusion rods (5) are arranged above the carbon fiber composite sample (3); and the lifting extrusion platform (4) and the bottom extrusion assembly (6) are butt-jointed via a linkage assembly (7); The end stop assembly (2) comprises a support (12) and a mounting frame (13); a loading and unloading turning mechanism (27) is provided on one side of the base plate (1); and a material conveying mechanism is provided on the top of the support (12); The material conveying mechanism comprises a plurality of conveying rollers (1201) rotatably mounted on the top of a support (12); the plurality of conveying rollers (1201) are equidistantly arranged in parallel, and are driven to rotate synchronously by a driving box (1202); the driving box (1202) inputs power via a first rotating motor (1203).

2. A carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 1, characterized in that: The lifting and extrusion platform (4) comprises an inverted U-shaped bracket (8), the top of the inverted U-shaped bracket (8) is fixedly connected to a first hydraulic telescopic rod (9), the telescopic end of the first hydraulic telescopic rod (9) passes through the inverted U-shaped bracket (8) and is fixedly connected to a push plate (10), and the front and rear sides of the bottom of the push plate (10) are fixedly connected to a cross plate (11); The inverted U-shaped bracket (8) is fixedly connected to the middle part of the top of the seat plate (1), and the two upper extrusion rods (5) are respectively fixedly mounted on the opposite side of the horizontal plate in the two cross plates (11).

3. A carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 2, characterized in that: A second hydraulic telescopic rod (14) is fixedly connected to the top of the mounting frame (13); a telescopic end of the second hydraulic telescopic rod (14) passes through the mounting frame (13) and is fixedly connected to a limit plate (15); the limit plate (15) is arranged directly above the support (12); The two supports (12) are respectively fixedly mounted on two sides of the top of the seat plate (1), and the two mounting frames (13) are respectively fixedly connected to two sides of the inverted U-shaped bracket (8).

4. A carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 2, characterized in that: The bottom extrusion assembly (6) comprises two tooth plates (16), a mounting frame (17) being fixedly connected between opposite sides of the two tooth plates (16), a third hydraulic telescopic rod (18) being fixedly connected to the bottom of the mounting frame (17), a telescopic end of the third hydraulic telescopic rod (18) passing through the mounting frame (17) and being fixedly connected to a lower extrusion rod (19).

5. A carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 4, characterized in that: The linkage assembly (7) comprises a gear (20), a plurality of mating teeth (21) are fixedly connected to the opposite side of the vertical plates of the two cross plates (11), and the gear (20) is arranged between the cross plate (11) and the tooth plate (16), and meshes with the tooth plate (16) and the mating teeth (21); The gear (20) is rotatably mounted on the top of the seat plate (1) via two auxiliary plates (22), and opposite sides of the two auxiliary plates (22) are in sliding contact with the two sides of the mating teeth (21) and the tooth plate (16), respectively.

6. A carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 5, characterized in that: Two first auxiliary rods (23) are fixedly connected to the top of the push plate (10), and the top ends of the two first auxiliary rods (23) penetrate the inverted U-shaped bracket (8) and extend above it; Two second auxiliary rods (24) are fixedly connected to the bottom of the lower extrusion rod (19), and the bottom ends of the two second auxiliary rods (24) both penetrate the installation frame (17) and extend to the bottom thereof.

7. The carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 2, characterized in that: The two cross plates (11) are fixedly connected to a sliding block (25) on one side opposite to the other, and a sliding groove (26) matching the sliding block (25) is provided on the surface of the inverted U-shaped bracket (8).

8. The carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 1, characterized in that: The loading and unloading turning mechanism (27) comprises a base (2701), a vertical support (2702) is fixed on the top of the base (2701), a lifting block (2704) is movably mounted on the vertical support (2702) via a vertical slide rail (2703), the lifting block (2704) is driven to move up and down by a lifting drive mechanism, a connecting shaft (2705) is rotatably mounted on the lifting block (2704), a first connecting frame (2706) is fixed on one end of the connecting shaft (2705) away from the lifting block (2704), and the first connecting frame (2706) is fixed on the other end of the connecting shaft (2705) away from the lifting block (2704). A second connecting frame (2707) is provided on a side of the connecting frame (2706) away from the connecting shaft (2705); a first push rod motor (2708) is provided between the first connecting frame (2706) and the second connecting frame (2707); two auxiliary support frames (2709) are symmetrically provided on a side of the second connecting frame (2707) away from the second connecting frame (2707); support rollers (2710) are rotatably mounted on the sides of the two auxiliary support frames (2709) close to each other; and a clamping mechanism is also provided on the second connecting frame (2707); The clamping mechanism comprises a clamping plate (2715), and the clamping plate (2715) is driven to move up and down by a second push rod motor (2714).

9. A carbon fiber unidirectional resin composite plate bending fatigue test device according to claim 8, characterized in that: A horizontal slide rail (2716) is fixed to one side of the vertical support (2702); two limit rods (2723) are fixed to one side of the lifting block (2704) away from the first connecting frame (2706); one end of the connecting shaft (2705) passes through the lifting block (2704) and extends to one side of the limit rod (2723), and is fixed with a first connecting rod (2720); a second connecting rod (2721) is fixed to the bottom end of the lifting block (2704); a spring (2722) is connected between the first connecting rod (2720) and the second connecting rod (2721); the first connecting rod (2720) is clamped at the top end of the limit rod (2723) by the pulling force of the spring (2722); a flip guide (2719) is fixed to the outside of the connecting shaft (2705) on the side of the lifting block (2704) away from the limit rod (2723); and a flip guide mechanism is slidably installed on the horizontal slide rail (2716); Two levers (2724) are fixed on the flip guide member (2719), and the flip guide mechanism comprises two symmetrically arranged shifting rods (2717), a horizontal bending portion is provided on the side where the top ends of the shifting rods (2717) are close to each other, a guide wedge block (2718) is provided between the two shifting rods (2717), and guide inclined surfaces are provided on both sides of the guide wedge block (2718).

10. A method for bending fatigue test of a carbon fiber unidirectional resin composite plate, implemented by a bending fatigue test device for a carbon fiber unidirectional resin composite plate according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: insert the carbon fiber composite sample (3) from the side between the two auxiliary support frames (2709), control the first push rod motor (2708) to extend, and push the carbon fiber composite sample (3) to move toward the top of the support (12), so that the carbon fiber composite sample (3) is placed on the top of the conveying roller (1201) by gravity, and the carbon fiber composite sample (3) is conveyed to the top of the support (12) by driving the conveying roller (1201) to rotate; Step 2, record the initial state of the carbon fiber composite sample (3), place the carbon fiber composite sample (3) above the two supports (12), start the second hydraulic telescopic rod (14), the second hydraulic telescopic rod (14) pushes the limit plate (15) close to the top of the carbon fiber composite sample (3), and when the limit plate (15) is 0.1-1 cm away from the top of the carbon fiber composite sample (3), stop extending the second hydraulic telescopic rod (14); Step 3, controlling the first hydraulic telescopic rod (9) to extend, the first hydraulic telescopic rod (9) pushes the push plate (10) to make the two cross plates (11) descend, the cross plates (11) drive the two upper extrusion rods (5) to descend, and the top of the carbon fiber composite sample (3) is extruded. During the process, the cross plates (11) drive the docking teeth (21) to rotate the gear (20), the gear (20) drives the tooth plate (16) to rise, the tooth plate (16) drives the mounting frame (17) to make the third hydraulic telescopic rod (18) rise, the third hydraulic telescopic rod (18) drives the lower extrusion rod (19) to rise, so that the lower extrusion rod (19) extrudes the bottom of the carbon fiber composite sample (3), and realizes the three-point extrusion bending of the carbon fiber composite sample (3); Step 4: Control the first hydraulic telescopic rod (9) to reset, so that the upper extrusion rod (5) and the lower extrusion rod (19) are separated from the carbon fiber composite sample plate (3); Step 5, repeating the operations of step 2 and step 3 several times to complete the bending fatigue test on the carbon fiber composite sample (3), observing the state of the carbon fiber composite sample (3) at this time, and comparing it with the initial state of the carbon fiber composite sample (3); Step 6: When the height of the lower extrusion rod (19) needs to be adjusted, the third hydraulic telescopic rod (18) is controlled to be telescopic.

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