Device and method for testing tensile property of carbon fiber composite material

Abstract

The invention discloses a carbon fiber composite material tensile property testing device and a testing method thereof, and relates to the technical field of carbon fiber composite material performance test.The carbon fiber composite material tensile property testing device comprises a supporting seat and two sliding seats slidably arranged on the supporting seat respectively, and the two ends of a to-be-tested piece are erected on the two sliding seats respectively; each sliding seat is provided with at least one pressing head; the device further comprises a first driving assembly and a second driving assembly, the first driving assembly is arranged between the supporting base and the two sliding bases, and the second driving assembly is arranged between the sliding bases and the pressing head. During testing, the first driving assembly firstly drives the two sliding seats to move oppositely or oppositely, then the two ends of a to-be-tested piece are erected on the two sliding seats respectively, the second driving assembly drives the pressing head to press the ends of the to-be-tested piece on the sliding seats, and the first driving assembly drives the two sliding seats to move oppositely. The to-be-tested piece is slowly stretched, so that the accuracy of a test result is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of performance testing of carbon fiber composite materials, and particularly relates to a tensile performance testing device for carbon fiber composite materials and a testing method thereof. Background Art

[0002] Carbon fiber composite materials have advantages such as light weight, high strength, good fatigue resistance, and strong corrosion resistance, and are widely used in fields such as aerospace, automotive industry, sports equipment, and new energy. Due to the influence of loads and complex environments during the manufacturing, processing, and actual service of carbon fiber composite materials, damages such as delamination, pores, fiber fracture, and fiber buckling are inevitably generated. The accumulation and development of these damages will reduce their mechanical properties. In order to ensure the stable and reliable operation of carbon fiber composite materials in complex and changing working environments, accurate testing of their mechanical properties is particularly important.

[0003] Existing mechanical property testing devices for carbon fiber composite materials usually adopt the design of independent double chucks, that is, during the testing process, two independent chucks are respectively used to clamp both ends of the specimen to be tested. During testing, the two chucks move in opposite directions to apply a tensile load to the specimen to be tested. However, since the driving devices of the two chucks are usually independently arranged, it is difficult to accurately ensure the synchronization of the displacements and loads at both ends of the specimen to be tested during the tensile process, resulting in uneven stress on both sides of the specimen to be tested. This stress state will make the specimen to be tested extremely prone to bending or torsional stress, resulting in deviation of the test data and inability to guarantee the accuracy of the test results. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a tensile performance testing device for carbon fiber composite materials and a testing method thereof. Two sliding seats move synchronously under the drive of the first drive assembly, and the pressing head presses the end of the specimen to be tested on the sliding seat, so that both ends of the specimen to be tested are evenly stressed, avoiding bending or torsion of the specimen to be tested during the testing process, and solving the technical problem that the test accuracy of the existing testing device cannot be guaranteed by reducing the test data error.

[0005] The present invention provides a tensile performance testing device for carbon fiber composite materials, including a support seat and two sliding seats that are respectively slidably arranged on the support seat. Both ends of the specimen to be tested are respectively placed on the two sliding seats, and each sliding seat is provided with at least one pressing head; further including:

[0006] A first drive assembly, which is arranged between the support seat and the two sliding seats and is used to drive the two sliding seats to move towards each other or away from each other;

[0007] A second drive assembly, which is arranged between the sliding seat and the pressing head and is used to drive the pressing head to press the end of the specimen to be tested on the sliding seat.

[0008] In some embodiments, the sliding seat includes a left sliding seat and a right sliding seat. The left sliding seat is fixedly provided with a left guide frame, and the left guide frame is slidably engaged with the left guide hole of the support seat; the right sliding seat is fixedly provided with a right guide frame, and the right guide frame is slidably engaged with the right guide hole of the support seat.

[0009] In some embodiments, the first driving assembly includes:

[0010] A first driving cylinder, which is fixedly arranged on the support seat;

[0011] A double-sided rack, which is fixedly connected to the first driving cylinder; left and right racks are respectively arranged on two opposite sides of the double-sided rack;

[0012] A left gear, which is rotatably arranged on the support seat and meshes with the left rack; a left limiting assembly is arranged between the left gear and the left guide frame, and the left limiting assembly is used to drive the left guide frame to slide along the left guide hole;

[0013] A right gear, which is rotatably arranged on the support seat and meshes with the right rack; a right limiting assembly is arranged between the right gear and the right guide frame, and the right limiting assembly is used to drive the right guide frame to slide along the right guide hole.

[0014] In some embodiments, the left limiting assembly includes a left limiting pin fixedly arranged on the left gear and a left limiting hole arranged on the left guide frame. The left limiting hole extends along a direction perpendicular to the sliding direction of the sliding seat, and the left limiting pin is slidably engaged with the left limiting hole;

[0015] The right limiting assembly includes a right limiting pin fixedly arranged on the right gear and a right limiting hole arranged on the right guide frame. The right limiting hole extends along a direction perpendicular to the sliding direction of the sliding seat, and the right limiting pin is slidably engaged with the right limiting hole.

[0016] In some embodiments, the support seat is fixedly provided with a material supporting frame for supporting the test piece to be tested, and the material supporting frame is located between the two sliding seats; the double-sided gear, the left gear and the right gear are all arranged on one side of the support seat away from the material supporting frame;

[0017] The material supporting frame is of a U-shaped structure, and an accommodating cavity is formed between the material supporting frame and the support seat, and the first driving cylinder is fixedly arranged in the accommodating cavity.

[0018] In some embodiments, the pressing head includes a lower pressing plate and a positioning shaft vertically connected to the lower pressing plate. The positioning shaft is slidably inserted into the sliding seat, and the positioning shaft is connected to the second driving assembly;

[0019] An L-shaped hole is arranged on the side wall of the positioning shaft. The L-shaped hole includes an axial hole and a circumferential hole that are vertically connected. The axial hole extends along the axial direction of the positioning shaft, and the circumferential hole extends along the circumferential direction of the positioning shaft;

[0020] The sliding seat is fixedly provided with a positioning bolt, and a limit pin is provided at the end of the positioning bolt. The end of the limit pin is matched with the L-shaped hole;

[0021] When the limit pin is located in the circumferential hole, the second driving component applies torque to the positioning shaft. The positioning shaft rotates relative to the sliding seat under the guidance of the limit pin until the lower pressing plate aligns with the end of the test piece to be tested. The limit pin enters the axial hole from the circumferential hole, and the second driving component continues to apply torque to the positioning shaft. The positioning shaft descends relative to the sliding seat under the guidance of the limit pin until the lower pressing plate presses the end of the test piece to be tested.

[0022] In some embodiments, the second driving component includes:

[0023] A helical gear, which is located in the sliding seat and fixedly connected to the positioning shaft;

[0024] A moving frame, which is slidably inserted into the sliding seat; a helical rack is provided on the inner side of the moving frame, and the helical rack is meshed with the helical gear;

[0025] A second driving cylinder, which is fixedly arranged on the sliding seat and fixedly connected to the moving frame.

[0026] In some embodiments, the pressing head further includes an adjusting bolt passing through the lower pressing plate and a positioning pressing block fixedly connected to the adjusting bolt.

[0027] In some embodiments, it further includes:

[0028] A robotic arm, which is used to carry the test piece to be tested;

[0029] A distance detecting member, which is used to detect the current distance between the two sliding seats;

[0030] A blanking detecting member, which is used to detect whether the test piece to be tested is placed between the two sliding seats;

[0031] A material pressing detecting member, which is used to detect whether the pressing head presses the test piece to be tested;

[0032] When the distance detecting member detects that the current distance reaches the set distance, the controller starts the robotic arm according to the signal fed back by the distance detecting member, and the robotic arm places the test piece to be tested on the two sliding seats along the preset track;

[0033] When the blanking detecting member detects that the test piece to be tested is placed between the two sliding seats, the controller starts the second driving component according to the signal fed back by the blanking detecting member, and the second driving component drives the pressing head to press the end of the test piece to the sliding seat;

[0034] When the blank holding detection component detects that the pressing head presses the specimen to be tested, the controller starts the first driving component according to the signal fed back by the blank holding detection component, and the first driving component drives the two sliding seats to move away from each other to stretch the specimen to be tested.

[0035] The present invention also provides a test method for a tensile property testing device of a carbon fiber composite material, which is applied to the above-mentioned tensile property testing device of a carbon fiber composite material. The steps include:

[0036] Start the first driving component, and the first driving component drives the two sliding seats to move towards or away from each other along the support seat to adjust the distance between the two sliding seats;

[0037] Judge whether the distance between the two sliding seats reaches the set distance. If so, place the two ends of the specimen to be tested on the two sliding seats respectively; if not, return to the previous step;

[0038] Start the second driving component to drive the pressing head, and the pressing head presses the end of the specimen to be tested on the sliding seat;

[0039] Start the first driving component, and the first driving component drives the two sliding seats to move away from each other along the support seat to stretch the specimen to be tested.

[0040] Compared with the background art, the present invention designs a tensile property testing device for a carbon fiber composite material, which includes a support seat, two sliding seats, a first driving component and a second driving component. Each sliding seat is provided with at least one pressing head. The first driving component is arranged between the support seat and the two sliding seats, and the second driving component is arranged between the sliding seat and the pressing head.

[0041] During the test, the first driving component first drives the two sliding seats simultaneously, so that the two sliding seats slide along the support seat respectively, and the two sliding seats move towards or away from each other to adjust the distance between the two sliding seats, and then place the two ends of the specimen to be tested on the two sliding seats respectively; then, the second driving component drives the pressing head to press the end of the specimen to be tested on the sliding seat; finally, the first driving component drives the two sliding seats simultaneously again, and the two sliding seats move away from each other along the support seat to slowly stretch the specimen to be tested, so as to realize the test of the tensile property of the carbon fiber composite material.

[0042] In the present invention, the first driving component drives the two sliding seats to act synchronously, ensuring that the displacements of the two ends of the specimen to be tested are completely consistent during the tensile test, avoiding the problem of uneven force caused by the asynchronous movement of the two ends of the specimen to be tested, reducing the risk of abnormal deformation such as bending or torsion of the specimen to be tested during the test, and the error of the test data can be controlled within a small range, and the accuracy of the test result is higher. Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0044] Figure 1 Schematic diagram of a tensile property testing device for a carbon fiber composite material provided by a specific embodiment of the present invention;

[0045] Figure 2 For Figure 1 bottom view;

[0046] Figure 3 For Figure 1 another schematic diagram in

[0047] Figure 4 For Figure 3 partial enlarged view of

[0048] Figure 5 For Figure 1 assembly drawing of the second driving assembly and the pressing head in

[0049] Figure 6 For Figure 1 exploded view of the support base and the first driving assembly in

[0050] The reference numerals are as follows:

[0051] Support base 1, sliding seat 2, specimen to be tested 3, pressing head 4, first driving assembly 5 and second driving assembly 6;

[0052] Left guiding hole 11, right guiding hole 12, material supporting frame 13 and positioning bolt 14;

[0053] Receiving cavity 131;

[0054] Limit pin 141;

[0055] Left sliding seat 21 and right sliding seat 22;

[0056] Left guiding frame 211;

[0057] Left limiting hole 2111;

[0058] Right guiding frame 221;

[0059] Right limiting hole 2211;

[0060] Lower pressing plate 41, positioning shaft 42, adjusting bolt 43 and positioning pressing block 44;

[0061] L-shaped hole 421;

[0062] Axial hole 4211 and circumferential hole 4212;

[0063] First driving cylinder 51, double-sided rack 52, left gear 53 and right gear 54;

[0064] Left rack 521 and right rack 522;

[0065] Left limit pin 531;

[0066] Right limit pin 541;

[0067] Helical gear 61, moving frame 62 and second driving cylinder 63;

[0068] Helical rack 621. Detailed implementation mode

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0071] The embodiment of the present invention discloses a tensile property testing device for carbon fiber composite materials, which is used to test the tensile properties of carbon fiber composite materials. As shown in the attached Figure 1 and 2 figure, the tensile property testing device for carbon fiber composite materials includes a support base 1 and two sliding seats 2. Among them, the support base 1 includes a support plate and four support legs fixedly arranged at the bottom of the support plate. The support legs are placed or fixed on the workbench. The arrangement of the support legs leaves an installation space between the support plate and the workbench, enabling the first driving assembly 5 to be smoothly installed at the bottom of the support plate.

[0072] The two sliding seats 2 are respectively slidably arranged on the sliding seats 2 of the support base 1. It should be noted that the two sliding seats 2 are arranged collinearly, so that the sliding trajectories of the two sliding seats 2 are on the same straight line, forming double support points between the two sliding seats 2 and the test piece 3 to be tested. The two ends of the test piece 3 to be tested are symmetrically stressed, effectively suppressing the vibration of the test piece 3 to be tested during the test and improving the stability.

[0073] When the distance between the two sliding seats 2 is less than the length of the specimen 3 to be tested, both ends of the specimen 3 to be tested are placed on the two sliding seats 2 respectively. During specific operation, it should be ensured that both ends of the specimen 3 to be tested extend beyond the outer edges of the two sliding seats 2 respectively to form a sufficient overhang length, as shown in the appendix Figure 1 This provides sufficient operating space for the pressing head 4 to apply pressure during the subsequent testing process, ensuring that the pressure can be evenly and stably applied to the specimen; moreover, the sufficient overhang length can effectively increase the contact area between the specimen 3 to be tested and the sliding seat 2, enhancing the fixing effect by increasing the friction force. More importantly, this design can effectively prevent the specimen 3 to be tested from shifting or loosening due to insufficient lapping length, effectively improving the stability of the testing process, ensuring the accuracy of the test data, and thus overall enhancing the reliability of the testing device and the accuracy of the test results. In addition, the supporting surface of the sliding seat 2 should be kept clean and flat, in full contact with the specimen 3 to be tested, and anti-slip patterns or anti-slip pads can be added to the supporting surface if necessary to further enhance the fixing effect.

[0074] Each sliding seat 2 is provided with at least one pressing head 4 for pressing the end of the specimen 3 to be tested against the sliding seat 2. Specifically, each sliding seat 2 is provided with two pressing heads 4, and the two pressing heads 4 respectively press the two opposite sides of one end of the specimen 3 to be tested, restricting the specimen 3 to swing during the testing process, ensuring that the specimen 3 to be tested is fixed reliably, and effectively improving the accuracy of the test data.

[0075] The tensile property testing device for carbon fiber composite materials further includes a first driving component 5 and a second driving component 6. The first driving component 5 is arranged between the support seat 1 and the two sliding seats 2 and is used to drive the two sliding seats 2 to move towards each other or away from each other; the second driving component 6 is arranged between the sliding seat 2 and the pressing head 4 and is used to drive the pressing head 4 to press the end of the specimen 3 to be tested against the sliding seat 2.

[0076] During testing, the first driving component 5 first drives the two sliding seats 2 simultaneously, so that the two sliding seats 2 slide along the support seat 1 respectively, and the two sliding seats 2 move towards each other or away from each other to adjust the distance between the two sliding seats 2, and then both ends of the specimen 3 to be tested are placed on the two sliding seats 2 respectively; then, the second driving component 6 drives the pressing head 4 to press the end of the specimen 3 to be tested against the sliding seat 2; finally, the first driving component 5 drives the two sliding seats 2 simultaneously again, and the two sliding seats 2 move away from each other along the support seat 1 to slowly stretch the specimen 3 to be tested, realizing the testing of the tensile properties of the carbon fiber composite material.

[0077] In the present invention, the first driving assembly 5 drives the two sliding seats 2 to move synchronously, ensuring that the displacements at both ends of the specimen 3 to be tested are exactly the same during the tensile test, avoiding the problem of uneven stress caused by the asynchronous movement of both ends of the specimen 3 to be tested, reducing the risk of abnormal deformation such as bending or torsion of the specimen 3 to be tested during the test, enabling the error of the test data to be controlled within a small range, and making the accuracy of the test result higher.

[0078] Specifically, as shown in the attached Figure 1 and 2 figures, the left guiding hole 11 and the right guiding hole 12 of the supporting seat 1, the sliding seat 2 includes a left sliding seat 21 and a right sliding seat 22. The left sliding seat 21 is fixedly provided with a left guiding frame 211, and the left guiding frame 211 is slidably engaged with the left guiding hole 11; the right sliding seat 22 is fixedly provided with a right guiding frame 221, and the right guiding frame 221 is slidably engaged with the right guiding hole 12. As a preferred embodiment, the left guiding frame 211 is L-shaped, and the left guiding frame 211 includes a left guiding rod and a left connecting rod that are vertically connected. The left guiding rod vertically passes through the left guiding hole 11, and the left guiding rod is slidably engaged with the left guiding hole 11; the left connecting rod is located on the side of the support plate away from the specimen 3 to be tested and is used to connect the first driving assembly 5. Similarly, the right guiding frame 221 is also L-shaped, and its structure can be specifically referred to the left guiding frame 211.

[0079] It should be noted that a redundant design of double holes and double rods is adopted between the left guiding hole 11 and the left guiding rod and between the right guiding hole 12 and the right guiding rod, that is, both the left guiding hole 11 and the right guiding hole 12 include two long holes arranged in parallel, and both the left guiding rod and the right guiding rod include two guiding rods arranged in parallel. This redundant design enables the two sliding seats 2 to be always restricted by the two guiding rods during the movement process, limiting the degrees of freedom of the two sliding seats 2 in the non-movement direction and avoiding yaw or jamming of the left guiding frame 211 and the right guiding frame 221.

[0080] As a preferred embodiment, as shown in the attached Figure 2 and 6 figures, the first driving assembly 5 includes a first driving cylinder 51, a double-sided rack 52, a left gear 53 and a right gear 54. Among them, the first driving cylinder 51 is fixedly provided on the supporting seat 1, and the first driving cylinder 51 is preferably a hydraulic cylinder, but is not limited thereto. The double-sided rack 52 is fixedly connected to the first driving cylinder 51. Specifically, the cylinder barrel of the first driving cylinder 51 is fixed on the supporting seat 1, and its piston rod is fixedly connected to the double-sided rack 52 through a connecting plate. The piston rod is parallel to the double-sided rack 52, and the first driving cylinder 51 and the double-sided rack 52 are respectively located on the upper and lower sides of the supporting seat 1, making full use of the upper and lower installation spaces of the supporting seat 1 to achieve a compact design of the whole test device and reduce the occupied space of the whole device.

[0081] The double-sided rack 52 is fixedly connected to the first driving cylinder 51, and the first driving cylinder 51 drives the double-sided rack 52 to perform a linear motion along the transverse direction of the support base 1. On two opposite sides of the double-sided rack 52, a left rack 521 and a right rack 522 are respectively provided. The left gear 53 meshes with the left rack 521, and the right gear 54 meshes with the right rack 522. The left gear 53 and the right gear 54 are both rotatably arranged on the support base 1, so that the double-sided rack 52 drives the left gear 53 and the right gear 54 to rotate in opposite directions.

[0082] A left limiting component is provided between the left gear 53 and the left guide frame 211. The left limiting component is used to drive the left guide frame 211 to slide along the left guide hole 11, so that the left sliding seat 21 performs a linear motion along the left guide hole 11. A right limiting component is provided between the right gear 54 and the right guide frame 221. The right limiting component is used to drive the right guide frame 221 to slide along the right guide hole 12, so that the right sliding seat 22 performs a linear motion along the right guide hole 12.

[0083] As a preferred embodiment, both the left limiting component and the right limiting component adopt a pin-hole sliding fit structure to convert the rotational motion of the two gears into the linear motion of the two guide frames. Specifically, the left limiting component includes a left limiting pin 531 fixedly arranged on the left gear 53 and a left limiting hole 2111 arranged on the left guide frame 211. The left limiting hole 2111 extends along a direction perpendicular to the sliding direction of the sliding seat 2, and the left limiting pin 531 is slidably matched with the left limiting hole 2111. The right limiting component includes a right limiting pin 541 fixedly arranged on the right gear 54 and a right limiting hole 2211 arranged on the right guide frame 221. The right limiting hole 2211 extends along a direction perpendicular to the sliding direction of the sliding seat 2, and the right limiting pin 541 is slidably matched with the right limiting hole 2211. In this design, both the left limiting hole 2111 and the right limiting hole 2211 are long holes extending along a direction perpendicular to the sliding direction of the sliding seat 2. The long holes form a rigid constraint on the movement trajectories of the left limiting pin 531 and the right limiting pin 541, ensuring the smooth movement of the left guide frame 211 and the right guide frame 221 and reducing the risk of jamming.

[0084] When the piston rod of the first driving cylinder 51 extends outwards, the piston rod drives the double-sided rack 52 to move transversely along the support base 1. The double-sided rack 52 drives the left gear 53 and the right gear 54 to rotate in opposite directions. The left limiting pin 531 drives the left guide frame 211 to perform a linear motion along the left guide hole 11 through the left limiting hole 2111, and the left sliding seat 21 moves linearly synchronously with the left guide frame 211. At the same time, the right limiting pin 541 drives the right guide frame 221 to perform a linear motion along the right guide hole 12 through the right limiting hole 2211, and the right sliding seat 22 moves linearly synchronously with the right guide frame 221, so that the two sliding seats 2 move towards each other or away from each other.

[0085] As a preferred embodiment, the support base 1 is fixedly provided with a workpiece supporting frame 13 for supporting the workpiece to be tested 3. The workpiece supporting frame 13 is located between the two sliding seats 2, providing an additional support point to prevent the middle part of the workpiece to be tested 3 from sagging due to its own weight, reducing the flexural deformation of the workpiece to be tested 3, ensuring that the workpiece to be tested 3 remains straight during the test, reducing the measurement error, and improving the accuracy of the measurement quantity. The supporting surfaces of the two sliding seats 2 and the workpiece supporting frame 13 are coplanarly arranged to keep the workpiece to be tested 3 straight. The double-sided gear, the left gear 53 and the right gear 54 are all arranged on the side of the support base 1 away from the workpiece supporting frame 13, making full use of the installation space on the upper and lower sides of the support base 1, with a more compact layout and less occupied space.

[0086] The workpiece supporting frame 13 is of a U-shaped structure, and an accommodating cavity 131 is formed between the workpiece supporting frame 13 and the support base 1. The first driving cylinder 51 is fixedly arranged in the accommodating cavity 131, making full use of the installation space formed by the special structure at the bottom of the workpiece supporting frame 13, making the structure more compact and reducing the interference of the outside world on the first driving cylinder 51.

[0087] As a preferred embodiment, the pressing head 4 includes a lower pressing plate 41 and a positioning shaft 42 vertically connected to the lower pressing plate 41. The positioning shaft 42 is slidably inserted into the sliding seat 2, enabling the positioning shaft 42 to slide relative to the sliding seat 2 along a direction perpendicular to the sliding direction of the sliding seat 2. The positioning shaft 42 is connected to the second driving assembly 6, enabling the second driving member to drive the positioning shaft 42 to first perform a rotational motion and then a linear motion.

[0088] As shown in the Figure 3 and 4 accompanying drawings, the positioning shaft 42 is a hollow shaft, and an L-shaped hole 421 is provided on its side wall. The L-shaped hole 421 includes an axial hole 4211 and a circumferential hole 4212 that are vertically connected. The axial hole 4211 extends along the axial direction of the positioning shaft 42, and the circumferential hole 4212 extends along the circumferential direction of the positioning shaft 42. The sliding seat 2 is fixedly provided with a positioning bolt 14, and a limit pin 141 is provided at the end of the positioning bolt 14. The end of the limit pin 141 is matched with the L-shaped hole 421, and the positioning bolt 14 is in threaded cooperation with the sliding seat 2, which is convenient for disassembly and assembly.

[0089] When the limit pin 141 is located in the circumferential hole 4212, the second driving assembly 6 applies a torque to the positioning shaft 42, and the positioning shaft 42 rotates relative to the sliding seat 2 under the guidance of the limit pin 141 until the lower pressing plate 41 aligns with the end of the workpiece to be tested 3. The limit pin 141 enters the axial hole 4211 from the circumferential hole 4212, and the second driving assembly 6 applies a torque to the positioning shaft 42. The positioning shaft 42 descends relative to the sliding seat 2 under the guidance of the limit pin 141 until the lower pressing plate 41 presses the end of the workpiece to be tested 3.

[0090] The present invention adjusts the position of the positioning shaft 42 by relying on the limiting component composed of the positioning bolt 14 and the L-shaped hole 421, and then adjusts the position of the pressing head 4, so that the pressing head 4 first rotates to align with the end of the test piece 3 to be tested, and then moves downward to press the test piece 3 to be tested on the sliding seat 2. The pressure of the pressing head 4 depends on its own gravity. In this way, it can ensure that the pressures of the pressing heads 4 on the two sliding seats 2 are consistent, so that the tensile forces received at both ends of the test piece 3 to be tested during the test are the same, reducing the risk of displacement of the test piece 3 to be tested during the test, and making the test result more accurate.

[0091] As a preferred embodiment, as shown in the attached Figures 3 to 5 figure, the second driving component 6 includes a helical gear 61, a moving frame 62 and a second driving cylinder 63. The helical gear 61 is located inside the sliding seat 2, and the helical gear 61 is fixedly connected to the positioning shaft 42. The moving frame 62 is slidably inserted into the sliding seat 2, and an internal helical rack 621 is provided on the inner side of the moving frame 62. The helical rack 621 meshes with the helical gear 61; the second driving cylinder 63 is fixedly arranged on the sliding seat 2, and the second driving cylinder 63 is fixedly connected to the moving frame 62.

[0092] Considering that a pressing head 4 is provided on each side of each sliding seat 2, that is, two positioning shafts 42 can be slidably inserted into each sliding seat 2. Correspondingly, the second driving component 6 includes two helical gears 61. The moving frame 62 is of a U-shaped structure and includes two parallel helical racks 621 and a fixing rod vertically connected between the two helical racks 621. The cylinder barrel of the second driving cylinder 63 is fixed on the sliding seat 2 and its piston rod is fixedly connected to the fixing rod.

[0093] When the second driving cylinder 63 extends outwards, the piston rod of the second driving cylinder 63 drives the moving frame 62 to perform a linear motion, and the two helical racks 621 move synchronously, driving the two helical gears 61 to rotate synchronously, so that the helical gears 61 drive the connected positioning shafts 42 to rotate first and then move, ensuring that the two pressing heads 4 on each sliding seat 2 act synchronously.

[0094] As a preferred embodiment, the pressing head 4 further includes an adjusting bolt 43 inserted through the lower pressing plate 41 and a positioning pressing block 44 fixedly connected to the adjusting bolt 43. The adjusting bolt 43 is in threaded cooperation with the lower pressing plate 41. By rotating the adjusting bolt 43, the height of the positioning pressing block 44 can be adjusted to ensure that the pressure applied by the positioning pressing block 44 to the test piece 3 to be tested is appropriate, and the pressing head 4 can adapt to test pieces 3 of different thicknesses.

[0095] The tensile property testing device for carbon fiber composite materials further includes a robotic arm, a distance detecting member, a blanking detecting member and a material pressing detecting member. The robotic arm is used to carry the test piece 3 to be tested.

[0096] The distance detection component is used to detect the current distance between the two sliding seats 2, specifically, it can be a distance sensor. When the distance detection component detects that the current distance between the two sliding seats 2 reaches the set distance, it means that the distance between the two sliding seats 2 is less than the length of the test piece 3 to be tested. At this time, the distance detection component sends a signal to the controller. After receiving this signal, the controller makes a judgment and sends an instruction to the robotic arm to automatically start the robotic arm. The robotic arm places the test piece 3 to be tested on the two sliding seats 2 along the preset trajectory, realizing automatic feeding. The set distance in the text refers to the optimal distance at which the two sliding seats 2 can support both ends of the test piece 3.

[0097] The blanking detection component is used to detect whether the test piece 3 to be tested is placed between the two sliding seats 2, specifically, it can be a contact sensor. When the blanking detection component detects that the test piece 3 to be tested is placed between the two sliding seats 2, at this time, the blanking detection component feeds back a signal to the controller. After receiving this signal, the controller makes a judgment and sends an instruction to the second driving component 6 to automatically start the second driving component 6. The second driving component 6 drives the pressing head 4 to press the end of the test piece 3 against the sliding seat 2, enabling the pressing head 4 to achieve automatic blanking.

[0098] The blanking pressure detection component is used to detect whether the pressing head 4 presses the test piece 3, specifically, it can be a pressure sensor. When the blanking pressure detection component detects that the pressing head 4 presses the test piece 3, the blanking pressure detection component feeds back a signal to the controller. After receiving this signal, the controller makes a judgment and sends an instruction to the first driving component 5 to automatically start the first driving component 5. The first driving component 5 drives the two sliding seats 2 to move away from each other, stretching the test piece 3, realizing automatic stretching.

[0099] By adding a distance detection component, a blanking detection component, and a blanking pressure detection component, the present invention enables automatic feeding, automatic blanking, and automatic stretching, and each action is automatically and continuously performed, with a low level of manual participation, small errors, and high test accuracy.

[0100] The present invention also provides a test method for a tensile property test device of a carbon fiber composite material, which is characterized in that it is applied to the above-mentioned tensile property test device of a carbon fiber composite material, and the steps include:

[0101] First step, start the first driving component 5, and the first driving component 5 drives the two sliding seats 2 to move towards or away from each other along the support seat 1 to adjust the distance between the two sliding seats 2; it should be added that before starting the first driving component 5, the adjusting bolt 43 can be rotated first to adjust the height of the positioning pressing block 44 to ensure that the positioning pressing block 44 can press the test piece 3.

[0102] Second step, determine whether the distance between the two sliding seats 2 reaches the set distance. If so, place both ends of the test piece 3 on the two sliding seats 2 respectively; if not, return to the previous step;

[0103] Step 3: Activate the second driving component 6 to drive the pressing head 4, and the pressing head 4 presses the end of the test piece 3 against the sliding seat 2.

[0104] Step 4: Activate the first driving component 5, and the first driving component 5 drives the two sliding seats 2 to move away from each other along the support seat 1 to stretch the test piece 3.

[0105] In the present invention, the two sliding seats 2 slide synchronously along the support seat 1 under the drive of the first driving member, moving towards each other or away from each other, ensuring that both ends of the test piece 3 are evenly stressed, avoiding bending or torsion of the test piece 3, and improving the accuracy of the test results.

[0106] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0107] Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A tensile property testing device for carbon fiber composite materials, characterized in that, It includes a support base (1) and two sliding seats (2) that can be slidably arranged on the support base (1) respectively. Both ends of the specimen to be tested (3) are respectively placed on the two sliding seats (2), and at least one pressing head (4) is provided on each sliding seat (2); it further includes: A first driving assembly (5), the first driving assembly (5) is arranged between the support base (1) and the two sliding seats (2), and is used to drive the two sliding seats (2) to move towards each other or away from each other; A second driving assembly (6), the second driving assembly (6) is arranged between the sliding seat (2) and the pressing head (4), and is used to drive the pressing head (4) to press the end of the specimen to be tested (3) against the sliding seat (2).

2. The tensile property testing device for carbon fiber composite materials according to claim 1, wherein The sliding seat (2) includes a left sliding seat (21) and a right sliding seat (22). A left guiding frame (211) is fixedly arranged on the left sliding seat (21), and the left guiding frame (211) is slidably matched with the left guiding hole (11) of the support base (1); a right guiding frame (221) is fixedly arranged on the right sliding seat (22), and the right guiding frame (221) is slidably matched with the right guiding hole (12) of the support base (1).

3. The tensile property testing device for carbon fiber composite materials according to claim 2, wherein, The first driving assembly (5) includes: A first driving cylinder (51), the first driving cylinder (51) is fixedly arranged on the support base (1); A double-sided rack (52), the double-sided rack (52) is fixedly connected with the first driving cylinder (51); on two opposite sides of the double-sided rack (52), a left rack (521) and a right rack (522) are respectively arranged; A left gear (53), the left gear (53) is rotatably arranged on the support base (1), and the left gear (53) is meshed with the left rack (521); a left limiting assembly is arranged between the left gear (53) and the left guiding frame (211), and the left limiting assembly is used to drive the left guiding frame (211) to slide along the left guiding hole (11); A right gear (54), the right gear (54) is rotatably arranged on the support base (1), and the right gear (54) is meshed with the right rack (522); a right limiting assembly is arranged between the right gear (54) and the right guiding frame (221), and the right limiting assembly is used to drive the right guiding frame (221) to slide along the right guiding hole (12).

4. The tensile property testing device for carbon fiber composite materials according to claim 3, characterized in that The left limiting assembly includes a left limiting pin (531) fixedly arranged on the left gear (53) and a left limiting hole (2111) arranged on the left guiding frame (211). The left limiting hole (2111) extends along the direction perpendicular to the sliding direction of the sliding seat (2), and the left limiting pin (531) is slidably matched with the left limiting hole (2111); The right limiting assembly includes a right limiting pin (541) fixedly arranged on the right gear (54) and a right limiting hole (2211) arranged on the right guiding frame (221). The right limiting hole (2211) extends along the direction perpendicular to the sliding direction of the sliding seat (2), and the right limiting pin (541) is slidably matched with the right limiting hole (2211).

5. The tensile property testing device for carbon fiber composite materials according to claim 3, characterized in that, The support base (1) is fixedly provided with a material supporting frame (13) for supporting the test piece (3) to be tested, and the material supporting frame (13) is located between the two sliding seats (2); the double-sided gear, the left gear (53) and the right gear (54) are all arranged on one side of the support base (1) away from the material supporting frame (13); The material supporting frame (13) is of a U-shaped structure, and an accommodating cavity (131) is formed between the material supporting frame (13) and the support base (1), and the first driving cylinder (51) is fixedly arranged in the accommodating cavity (131).

6. The tensile property testing device for carbon fiber composite materials according to any one of claims 1 to 5, characterized in that, The pressing head (4) includes a lower pressing plate (41) and a positioning shaft (42) vertically connected to the lower pressing plate (41), the positioning shaft (42) is slidably inserted into the sliding seat (2), and the positioning shaft (42) is connected to the second driving assembly (6); An L-shaped hole (421) is provided on the side wall of the positioning shaft (42), the L-shaped hole (421) includes an axial hole (4211) and a circumferential hole (4212) that are vertically connected, the axial hole (4211) extends along the axial direction of the positioning shaft (42), and the circumferential hole (4212) extends along the circumferential direction of the positioning shaft (42); The sliding seat (2) is fixedly provided with a positioning bolt (14), a limiting pin (141) is provided at the end of the positioning bolt (14), and the end of the limiting pin (141) is matched with the L-shaped hole (421); When the limiting pin (141) is located in the circumferential hole (4212), the second driving assembly (6) applies a torque to the positioning shaft (42), and the positioning shaft (42) rotates relative to the sliding seat (2) under the guidance of the limiting pin (141) until the lower pressing plate (41) is aligned with the end of the test piece (3) to be tested, the limiting pin (141) enters the axial hole (4211) from the circumferential hole (4212), and the second driving assembly (6) continues to apply a torque to the positioning shaft (42), and the positioning shaft (42) descends relative to the sliding seat (2) under the guidance of the limiting pin (141) until the lower pressing plate (41) presses the end of the test piece (3) to be tested.

7. The tensile property testing device for carbon fiber composite materials according to claim 6, wherein, The second driving assembly (6) includes: A helical gear (61), the helical gear (61) is located in the sliding seat (2), and the helical gear (61) is fixedly connected to the positioning shaft (42); A moving frame (62), the moving frame (62) is slidably inserted into the sliding seat (2); an inclined rack (621) is provided on the inner side of the moving frame (62), and the inclined rack (621) is engaged with the helical gear (61); A second driving cylinder (63), the second driving cylinder (63) is fixedly arranged on the sliding seat (2), and the second driving cylinder (63) is fixedly connected to the moving frame (62).

8. The tensile property testing device for carbon fiber composite materials according to claim 6, wherein The pressing head (4) further includes an adjusting bolt (43) passing through the lower pressing plate (41) and a positioning pressing block (44) fixedly connected to the adjusting bolt (43).

9. The tensile property testing device for carbon fiber composite materials according to claim 6, characterized in that, It further includes: A robotic arm for carrying the test piece (3) to be tested; A distance detection component, which is used to detect the current distance between the two sliding seats (2); A blanking detection component, which is used to detect whether the test piece (3) is placed between the two sliding seats (2); A blanking pressing detection component, which is used to detect whether the pressing head (4) presses the test piece (3); When the distance detection component detects that the current distance reaches the set distance, the controller starts the robotic arm according to the signal fed back by the distance detection component, and the robotic arm places the test piece (3) on the two sliding seats (2) along a preset trajectory; When the blanking detection component detects that the test piece (3) is placed between the two sliding seats (2), the controller starts the second driving component (6) according to the signal fed back by the blanking detection component, and the second driving component (6) drives the pressing head (4) to press the end of the test piece (3) against the sliding seat (2); When the blanking pressing detection component detects that the pressing head (4) presses the test piece (3), the controller starts the first driving component (5) according to the signal fed back by the blanking pressing detection component, and the first driving component (5) drives the two sliding seats (2) to move away from each other to stretch the test piece (3).

10. A testing method for a tensile property testing device of a carbon fiber composite material, characterized in that, Applied to the carbon fiber composite material tensile property testing device according to any one of claims 1 to 9, the steps include: Starting the first driving component, and the first driving component drives the two sliding seats to move towards or away from each other along the support seat to adjust the distance between the two sliding seats; Judging whether the distance between the two sliding seats reaches the set distance. If so, place the two ends of the test piece on the two sliding seats respectively; if not, return to the previous step; Starting the second driving component to drive the pressing head, and the pressing head presses the end of the test piece against the sliding seat; Starting the first driving component, and the first driving component drives the two sliding seats to move away from each other along the support seat to stretch the test piece.

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