A composite strength testing apparatus

Abstract

The application relates to the technical field of shearing test, in particular to a composite material strength testing device which comprises a tester, a moving platform arranged on the tester and used for moving up and down to perform test, a base mounted on the bottom end of the tester through bolts, an L-shaped plate fixedly connected to the top end of the base, and a right-angle plate with an inclined surface arranged below the moving platform. The device is provided with a plurality of clamping blocks and T-shaped rods, and only needs to cut the composite material into a specified strip, clamp the strip on the clamping seat, clamp and isolate the test block into multiple sections under the action of the clamping blocks, then drive the moving platform and the right-angle plate to move downward under the action of the tester, and drive the plurality of T-shaped rods to insert into the through grooves one by one to perform shearing test on the composite material test block, so that multiple shearing tests can be completed at one time of clamping, the manpower and time for repeated clamping, positioning and measurement are saved, positioning errors caused by multiple clamping are avoided, and data consistency and test efficiency are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of shearing test, in particular to a composite material strength testing device. BACKGROUND

[0002] Composite materials are widely used in the fields of aerospace, automobiles, buildings and the like due to excellent mechanical properties and light weight characteristics, however, the shear performance of the composite materials is strictly required in the application scenarios, the shear performance of the composite materials refers to the anti-shear deformation and damage capacity of the materials under the action of shear stress, the performance is directly related to the safety and reliability of the materials in actual use, and therefore, a testing device needs to be used for shear test of the composite materials.

[0003] In order to ensure the reliability of interlaminar shear strength, the existing method needs to cut a same piece of composite material into multiple short samples, then clamps and loads each piece, and repositions, centers and resets before each shear, a set of data needs to be repeatedly disassembled and assembled for multiple times, the operation chain is long, the auxiliary time is high, and the positions of multiple clamps are deviated, so that the result deviates from the true value, becomes a bottleneck in the research and development and quality inspection links, and greatly reduces the testing efficiency of the device.

[0004] Therefore, the composite material strength testing device is provided to solve the above problems. SUMMARY

[0005] The application aims to solve the problems in the background art and provides a composite material strength testing device.

[0006] To achieve the above purpose, the application adopts the technical scheme of a composite material strength testing device, comprising a tester, a moving platform for upward and downward movement for testing is arranged on the tester, a base is installed at the bottom end of the tester through bolts, an L-shaped plate is fixedly connected to the top end of the base, a right-angle plate with an inclined surface is arranged below the moving platform, an L-shaped clamping seat is fixedly connected to the front side of the L-shaped plate, a plurality of clamping blocks are equidistantly arranged on the inner side of the clamping seat, a through groove is formed through the positions between the clamping blocks on the side wall of the clamping seat, a connecting plate is fixedly connected between the front sides of the clamping blocks, a clamping mechanism for driving the connecting plate to move is arranged on the L-shaped plate, an L-shaped sliding plate is transversely and slidably connected to the front side of the L-shaped plate, a T-shaped rod is transversely and slidably connected to the positions beside the through grooves on the front side of the sliding plate, an upper circular rod is arranged on the side wall of the T-shaped rod, the inclined surface of the right-angle plate is arranged on the side close to the clamping seat, and a same moving mechanism for simultaneously driving a plurality of T-shaped rods to move is further arranged.

[0007] Further, the middle electric telescopic cylinder is fixedly connected to the middle part of the side wall of the clamping seat, and the output end of the middle electric telescopic cylinder is fixedly connected to the side wall of the connecting plate.

[0008] Further, the side groove is formed in the side wall of the T-shaped rod, and the extrusion head with the pressure sensor is fixedly connected to the inner side of the side groove.

[0009] Further, the circular grooves are formed in the front sides of the T-shaped rods, the upper circular rods are slidably connected to the inner sides of the circular grooves, the upper springs are fixedly connected between the inner sides of the circular grooves and the side walls of the upper circular rods, the front sides of the upper circular rods are smooth arc surfaces, the right-angle blocks with inclined surfaces are fixedly connected to the top ends of the right-angle plates, and the inclined surfaces of the right-angle blocks are arranged on the sides close to the L-shaped plates.

[0010] Further, the sliding grooves are formed in the front sides of the T-shaped rods, the fixed plates are fixedly connected to the inner sides of the sliding grooves relative to the positions of the front sides of the sliding plates, and the upper return springs are fixedly connected between the side walls of the fixed plates and the inner sides of the sliding grooves.

[0011] Further, the same moving mechanism comprises a lower circular rod, the side blocks are fixedly connected to the middle parts of the side walls of the sliding plates, the lower circular rod is fixedly connected to the front side of the side block, the rear grooves are formed in the rear sides of the sliding plates, the limit plates are slidably connected to the inner sides of the rear grooves, the three limit rods are fixedly connected to the rear side of the limit plate, the limit grooves are formed in the front sides of the L-shaped plates relative to the positions of the rear sides of the three limit rods, the three limit rods are inserted into the corresponding limit grooves, the rectangular rods are fixedly connected to the middle parts of the front sides of the limit plates, the front sides of the rectangular rods penetrate through the front sides of the sliding plates, the limit springs are fixedly connected between the inner sides of the rear grooves and the front sides of the limit plates, the release grooves are formed in the side walls of the rectangular rods, the front sides of the release grooves are inclined, and the release grooves are arranged on the sides close to the side blocks.

[0012] Further, the moving frame is threadedly connected to the bottom end of the moving platform, the adjusting blocks are slidably connected to the inner side of the moving frame, the release rods are arranged on the rear side of the adjusting blocks, the connecting rods are fixedly connected between the rear side of the adjusting blocks and the front sides of the right-angle plates and the release rods, the studs are threadedly connected to the side walls of the moving frame, the studs are rotatably connected to the side walls of the adjusting blocks, and the bottom end of the release rod is inclined.

[0013] Further, the pair of return grooves are formed in the rear side of the L-shaped plate, the return plates are fixedly connected to the inner sides of the return grooves relative to the positions of the rear sides of the sliding plates, and the return plates are slidably connected to the inner sides of the return grooves, the lower return springs are fixedly connected between the inner sides of the return grooves and the side walls of the return plates.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1、The present application can isolate the test block into multiple segments through the setting of multiple clamping and T-shaped rod structures, only need to cut the composite material into a specified strip, clamp it on the clamping seat, and under the action of the driving moving platform and the downward movement of the right-angle plate, the multiple T-shaped rods can be inserted into the through slot one by one to perform shear test on the composite material test block, so that multiple shear tests can be completed at one time, the manpower and time for repeated clamping, positioning and measurement are saved, positioning errors caused by multiple clamping are avoided, and data consistency and test efficiency are improved.

[0016] 2、The present application can change the previous multiple shear tests of the composite material test block one by one into simultaneous shear tests through the setting of the same movement mechanism, so that flexible transformation can be performed according to test requirements, test efficiency, data consistency and equipment utilization are significantly improved, and the present application is suitable for the research and development verification and rapid sampling inspection of the interlaminar shear performance of composite materials. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a front perspective structural schematic view of the test device of the present application;

[0018] Figure 2 It is a rear perspective structural schematic view of the L-shaped plate of the present application; Figure 1 It is a partial enlarged structural schematic view of position A in the present application;

[0019] Figure 3 It is a rear perspective structural schematic view of the L-shaped plate of the present application;

[0020] Figure 4 It is a separated perspective structural schematic view of the moving platform and the moving frame of the present application;

[0021] Figure 5 It is a separated partial cutaway perspective structural schematic view of the L-shaped plate, the sliding plate and the clamping seat of the present application;

[0022] Figure 6 It is a separated perspective structural schematic view of the clamping seat and the connecting plate of the present application;

[0023] Figure 7 It is a rear perspective structural schematic view of the moving frame, the sliding plate and the clamping seat of the present application after adjustment;

[0024] Figure 8 It is a full cutaway perspective structural schematic view of the sliding plate of the present application;

[0025] Figure 9 It is a separated perspective structural schematic view of the sliding plate, the T-shaped rod and the upper round rod of the present application.

[0026] In the figure: 1, tester; 2, moving platform; 3, base; 4, L-shaped plate; 5, right-angle plate; 6, clamping seat; 7, clamping block; 8, through slot; 9, connecting plate; 10, clamping mechanism; 11, sliding plate; 12, T-shaped rod; 13, upper round rod; 14, middle electric telescopic cylinder; 15, extrusion head; 16, round groove; 17, upper spring; 18, right-angle block; 19, fixed plate; 20, upper reset spring; 21, lower round rod; 22, stud; 23, side block; 24, rear groove; 25, limiting plate; 26, limiting rod; 27, limiting groove; 28, rectangular rod; 29, limiting spring; 30, release groove; 31, moving frame; 32, adjusting block; 33, release rod; 34, connecting rod; 35, reset groove; 36, reset plate; 37, lower reset spring. DETAILED DESCRIPTION

[0027] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the following further describes the present application with reference to the accompanying drawings and specific embodiments.

[0028] In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the application, but the application can also be implemented in other ways different from those described herein, and therefore the application is not limited to the specific embodiments disclosed below.

[0029] In actual use, it is found that, in order to ensure the reliability of interlaminar shear strength, the existing method needs to cut the same piece of composite material into multiple short samples, then clamp and load each piece one by one, and reposition, center and reset before each shear section, and a set of data often needs to be repeatedly disassembled and assembled for many times, the operation chain is long, the auxiliary time is high, and the position deviates after multiple clamping, which makes the result deviate from the true value, becomes the bottleneck of research and development and quality inspection, and greatly reduces the testing efficiency of the device.

[0030] As Figures 1-9The composite material strength testing device shown includes a tester 1, a moving platform 2 is arranged on the tester 1 for up-down movement for testing, the moving platform 2 is driven by a driving member and can control up-down displacement, a compression, shear or extrusion load is applied to a test sample, which is a mature technology in the prior art and will not be described in detail here, a base 3 is installed at the bottom end of the tester 1 through bolts, an L-shaped plate 4 is fixedly connected to the top end of the base 3, a right-angle plate 5 with an inclined surface is arranged below the moving platform 2, an L-shaped clamping seat 6 is fixedly connected to the front side of the L-shaped plate 4, a plurality of clamping blocks 7 are equidistantly arranged on the inner side of the clamping seat 6, through grooves 8 are formed in the clamping seat 6 side wall relative to the positions between the plurality of clamping blocks 7, a connecting plate 9 is fixedly connected between the front sides of the plurality of clamping blocks 7, a clamping mechanism 10 for driving the connecting plate 9 to move is arranged on the L-shaped plate 4, the clamping mechanism 10 mainly comprises an electric telescopic cylinder and a driving block and the like, and can automatically connect the connecting plate 9 and the clamping blocks 7 to move horizontally, which is a mature technology in the prior art and will not be described in detail here;

[0031] An L-shaped sliding plate 11 is transversely and slidably connected to the front side of the L-shaped plate 4, T-shaped rods 12 are transversely and slidably connected to the front side of the sliding plate 11 relative to the positions beside the through grooves 8, the through grooves 8 are arranged to facilitate the T-shaped rods 12 to extrude the composite material test sample for testing, so as to avoid being hindered, upper round rods 13 are arranged on the side walls of the T-shaped rods 12, the inclined surface of the right-angle plate 5 is arranged on the side close to the clamping seat 6, and a same moving mechanism is further arranged for simultaneously driving the plurality of T-shaped rods 12 to move, it should be noted that the adjacent shear port center distance is greater than or equal to 3t (t = sample thickness), so as to avoid stress field superposition, so that the clamping seat 6 with fixed spacing between the through grooves 8 can only test the composite material test sample within the applicable range, so as to ensure the accuracy of the test result, if the thickness exceeds the specified range, the clamping seat 6 and the sliding plate 11 with larger spacing through grooves 8 need to be replaced;

[0032] A middle electric telescopic cylinder 14 is fixedly connected to the middle part of the clamping seat 6 side wall, the output end of the middle electric telescopic cylinder 14 is fixedly connected to the connecting plate 9 side wall through the clamping seat 6 side wall, the middle electric telescopic cylinder 14 is arranged to pull the connecting plate 9 to drive the clamping blocks 7 to move together with the clamping mechanism 10, the function of the middle electric telescopic cylinder 14 is mainly to tighten the clamping blocks 7 in the middle part, so as to ensure the clamping effect of the plurality of clamping blocks 7 on the composite material test sample, and further ensure the accuracy of the test result;

[0033] The side wall of the T-shaped rod 12 is provided with a side groove, and a pressing head 15 with a pressure sensor is fixedly connected to the inner side of the side groove. The pressing head 15 is provided with a high-precision pressure sensor. A strain gauge or a silicon gem element converts mechanical load into a millivolt-level electrical signal. A front-end amplifier filters and amplifies in real time. After being digitized by a 24-bit ADC, the signal is sampled by an MCU at 1 kHz. The load value is output in real time, and the displacement encoder data is synchronized. The software converts the shear stress according to the area, automatically generates a τ-ε curve, and immediately stops when the threshold value is exceeded. The whole closed loop ensures the test accuracy of ±0.5%.

[0034] The front side of the T-shaped rod 12 is provided with a circular groove 16, and the upper circular rod 13 is slidingly connected to the inner side of the circular groove 16. The inner side of the circular groove 16 and the side wall of the upper circular rod 13 are fixedly connected. The front side of the upper circular rod 13 is provided with a smooth circular arc surface. The top end of the right-angle plate 5 is fixedly connected with a right-angle block 18 having an inclined surface, and the inclined surface of the right-angle block 18 is arranged on the side close to the L-shaped plate 4.

[0035] The front side of the T-shaped rod 12 is provided with a sliding groove. The fixed plate 19 is fixedly connected to the inner side of the sliding groove. The upper reset spring 20 is fixedly connected between the side wall of the fixed plate 19 and the inner side of the sliding groove. When the right-angle plate 5 is removed, the upper reset spring 20 can quickly push the T-shaped rod 12 to reset through the elastic force of the upper reset spring 20.

[0036] The moving platform 2 is threadedly connected with a moving frame 31 at the bottom end. The moving frame 31 is slidingly connected with an adjusting block 32 at the inner side. The adjusting block 32 is provided with a release rod 33. The adjusting block 32, the release rod 33 and the front side of the right-angle plate 5 are fixedly connected with a connecting rod 34.

[0037] When the shear strength of the composite material is tested, the composite material is first cut into a sample of a specified size. Then the composite material sample is inserted between the clamping seat 6 and the clamping block 7 from the output end of the middle electric telescopic cylinder 14. Then the clamping mechanism 10 can be controlled to start moving the connecting plate 9 and the clamping block 7. At the same time, the middle electric telescopic cylinder 14 is started to pull the clamping block 7 to tightly clamp the composite material sample between the clamping seat 6 and the clamping block 7. Through the arrangement of the multiple clamping blocks 7 and the through grooves 8, the long composite material sample is clamped and isolated into multiple sections (because the both ends of the through groove 8 are clamped by the clamping block 7, the part beside each through groove 8 is not affected by the shear of other parts of the sample, so the sample beside each through groove 8 is a section of the sample).

[0038] Then the tester 1 can be controlled to start driving the moving platform 2 to descend, and the moving frame 31, the connecting rod 34 and the right-angle plate 5 are driven to descend together. Then the right-angle plate 5 moves above the uppermost upper circular rod 13. Then the right-angle plate 5 continues to descend. Since the upper circular rod 13 can slide in the circular groove 16, and the T-shaped rod 12 can move horizontally on the sliding plate 11, but the descent of the right-angle plate 5 causes the slope of the right-angle plate 5 to be unable to extrude the upper circular rod 13 into the circular groove 16, so the upper circular rod 13 and the T-shaped rod 12 are extruded to move horizontally, and the upper return spring 20 is gradually compressed, so that the extrusion head 15 moves to the through groove 8, and the extrusion head 15 extrudes the composite material sample to perform shear test. In this process, the data during the test is monitored through the pressure sensor on the extrusion head 15 (when one section of the sample is subjected to shear extrusion test, since the other part of the sample is clamped by the multiple clamping blocks 7, the whole sample will not deform, only the unclamped part beside the through groove 8 can deform). Then when the upper circular rod 13 moves out of the slope of the right-angle plate 5, the extrusion on the upper circular rod 13 is released, and then the upper circular rod 13 is pushed to reset under the elastic force of the upper return spring 20, so that the test of the first section of the sample is completed. The right-angle plate 5 continues to descend, and the right-angle plate 5 moves above the second upper circular rod 13. The above operation is repeated to continue the test. In this way, the multiple section tests of the long strip sample are realized.

[0039] When the test is completed, the moving platform 2 can be controlled to reset, and then the moving frame 31 and the right-angle plate 5 are reset. In this process, the right-angle block 18 is first moved below the upper circular rod 13. Since the upper circular rod 13 can slide inside the circular groove 16, when the right-angle block 18 gradually moves up, the slope of the right-angle block 18 will extrude the arc surface at the front end of the upper circular rod 13, so that the upper circular rod 13 is gradually extruded into the circular groove 16, and the upper spring 17 is compressed. Then the upper circular rod 13 is extruded behind the right-angle plate 5. Until the right-angle plate 5 moves away, the extrusion on the upper circular rod 13 is released, and then the upper circular rod 13 is pushed to reset under the elastic force of the upper spring 17. In this way, the right-angle block 18 and the right-angle plate 5 are reset through multiple upper circular rods 13.

[0040] As described above, through the design of the above structure, the composite material is only cut into a specified long strip and clamped on the clamping seat 6. Under the action of the multiple clamping blocks 7, the test block can be clamped and isolated into multiple sections. Then under the action of the descent of the moving platform 2 and the right-angle plate 5 driven by the tester 1, multiple T-shaped rods 12 are driven to insert into the through groove 8 one by one to perform shear test on the composite material test block. In this way, multiple shear tests can be completed at one time of clamping, which saves the manpower and time of repeated clamping, positioning and measurement, avoids the positioning error caused by multiple clamping, and improves the data consistency and test efficiency.

[0041] On the basis of the above embodiment, it is found that the above structure can quickly complete multiple composite material sample tests, but only one composite material sample can be tested at a time, which is relatively limited and cannot meet the diversified testing needs of testers. In order to solve the above problems, the above structure is further improved.

[0042] The same moving mechanism includes a lower round rod 21, a side block 23 fixedly connected to the middle of the side wall of the sliding plate 11, the lower round rod 21 fixedly connected to the front side of the side block 23, a rear groove 24 is opened on the rear side of the sliding plate 11, a limiting plate 25 is transversely and slidably connected to the inner side of the rear groove 24, three limiting rods 26 are fixedly connected to the rear side of the limiting plate 25, a limiting groove 27 is opened on the front side of the L-shaped plate 4 relative to the rear side of the three limiting rods 26, and the three limiting rods 26 are inserted into the corresponding limiting groove 27, a rectangular rod 28 is fixedly connected to the middle of the front side of the limiting plate 25, and the rectangular rod 28 is arranged through the front side of the sliding plate 11, a plurality of limiting springs 29 are fixedly connected between the inner side of the rear groove 24 and the front side of the limiting plate 25, a release groove 30 is opened on the side wall of the rectangular rod 28, and the front side of the release groove 30 is inclined, and the release groove 30 is arranged on the side close to the side block 23;

[0043] The side wall of the moving frame 31 is threaded and connected with a stud 22, the side end of the stud 22 is rotatably connected to the side wall of the adjusting block 32, and the bottom end of the release rod 33 is inclined;

[0044] A pair of reset grooves 35 are opened through the rear side of the L-shaped plate 4, a reset plate 36 is fixedly connected to the inner side of the reset groove 35 relative to the rear side of the sliding plate 11, and the reset plate 36 is transversely and slidably connected to the inner side of the reset groove 35, and a lower reset spring 37 is fixedly connected between the inner side of the reset groove 35 and the side wall of the reset plate 36;

[0045] When the tester wants to change the test style and needs to test multiple parts of the composite sample at the same time, first screw the stud 22 into the moving frame 31 to move, so as to push the adjusting block 32 to move in the moving frame 31, and at the same time, drive the right-angle plate 5 and the release rod 33 to move together through the connecting rod 34, until the right-angle plate 5 moves above the lower circular rod 21, and the release rod 33 moves directly above the release slot 30, so that the tester 1 can be controlled to start after the clamping of the composite sample is completed, drive the moving platform 2 to move down, and at the same time, drive the moving frame 31, the right-angle plate 5 and the release rod 33 to move down together. In this process, the release rod 33 will first be inserted into the release slot 30. Since the rectangular rod 28 can only move horizontally, when the release rod 33 moves down and the bottom inclined surface of the release rod 33 presses the inclined surface of the release slot 30, the rectangular rod 28 will be pushed to move forward, and at the same time, the limiting plate 25 and the limiting rod 26 will move, so as to pull the limiting rod 26 out of the limiting slot 27, release the limitation of the sliding plate 11 horizontally sliding, and at the same time, compress multiple limiting springs 29. Then the front side of the release rod 33 will move to the inside of the release slot 30, keeping pressing the rectangular rod 28;

[0046] Then the right-angle plate 5 moves above the lower circular rod 21. Since the sliding plate 11 can only move horizontally on the L-shaped plate 4, when the right-angle plate 5 moves down, the inclined surface of the right-angle plate 5 will press the arc surface of the lower circular rod 21, so as to press the lower circular rod 21 and the sliding plate 11 to move horizontally, and at the same time, drive the reset plate 36 to slide in the reset slot 35 and gradually compress the lower reset spring 37. At the same time, the rectangular rod 28, the limiting plate 25 and the limiting rod 26 will move, so as to drive the rectangular rod 28 to move out of the release rod 33. When the rectangular rod 28 is completely removed from the release rod 33, the pressing of the rectangular rod 28 will be released. However, at this time, the limiting rod 26 has been moved away from the limiting slot 27, so the limiting rod 26 will be against the front side of the L-shaped plate 4 and move together with the sliding plate 11. Through the movement of the sliding plate 11, multiple T-shaped rods 12 and pressing heads 15 will be moved, and the composite sample at the through slot 8 will be synchronously sheared and tested. Finally, after the test is completed, the tester 1 is controlled to drive the moving platform 2 to reset, and the above operation is repeated in reverse. In this process, when the release rod 33 is removed from the release slot 30, the limiting rod 26 will be pulled into the corresponding limiting slot 27 under the elastic force of the limiting spring 29, limiting the sliding position of the sliding plate 11, and ensuring the stability during the shearing test.

[0047] In summary, through the design of the above structure, the original shearing test of multiple composite test blocks one by one can be changed into simultaneous shearing test, so as to flexibly change according to the test requirements, significantly improve the test efficiency, data consistency and equipment utilization, and be suitable for the research and development verification and rapid sampling inspection of the interlaminar shear performance of composite materials.

[0048] The foregoing shows and describes the basic principles, main features and advantages of the present application.

[0049] Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A composite material strength testing device, comprising a testing instrument (1), wherein the testing instrument (1) is provided with a moving platform (2) for moving up and down to perform testing, characterized in that: The tester (1) has a base (3) bolted to its bottom. An L-shaped plate (4) is fixedly connected to the top of the base (3). A right-angle plate (5) with an inclined surface is provided below the moving platform (2). An L-shaped clamping seat (6) is fixedly connected to the front of the L-shaped plate (4). Several clamping blocks (7) are equidistantly arranged on the inner side of the clamping seat (6). Through slots (8) are opened on the side wall of the clamping seat (6) relative to the positions between the clamping blocks (7). A connecting rod is fixedly connected between the front sides of the clamping blocks (7). The connecting plate (9) is provided with a clamping mechanism (10) for driving the connecting plate (9) to move. The front side of the L-shaped plate (4) is slidably connected to an L-shaped slide plate (11). The front side of the slide plate (11) is slidably connected to a T-shaped rod (12) relative to the position next to the through groove (8). The side wall of the T-shaped rod (12) is provided with an upper round rod (13). The inclined surface of the right angle plate (5) is set on the side close to the clamping seat (6). A co-movement mechanism for simultaneously driving multiple T-shaped rods (12) to move is also provided. The same-movement mechanism includes a lower round rod (21), a side block (23) is fixedly connected to the middle of the side wall of the slide plate (11), the lower round rod (21) is fixedly connected to the front side of the side block (23), a rear groove (24) is opened on the rear side of the slide plate (11), a limit plate (25) is laterally slidably connected to the inner side of the rear groove (24), three limit rods (26) are fixedly connected to the rear side of the limit plate (25), and a limit groove (27) is opened on the front side of the L-shaped plate (4) relative to the rear side of the three limit rods (26), and the three limit rods (27) are fixedly connected to the limit plate (25). The limiting rods (26) are all inserted into the inner side of the corresponding limiting grooves (27). A rectangular rod (28) is fixedly connected to the middle of the front side of the limiting plate (25), and the front side of the rectangular rod (28) passes through the front side of the sliding plate (11). Several limiting springs (29) are fixedly connected between the inner side of the rear groove (24) and the front side of the limiting plate (25). A release groove (30) is opened on the side wall of the rectangular rod (28), and the front side of the release groove (30) is inclined. The release groove (30) is located on the side close to the side block (23). The bottom of the mobile platform (2) is threadedly connected to a mobile frame (31). An adjustment block (32) is slidably connected to the inner side of the mobile frame (31). A release rod (33) is provided on the rear side of the adjustment block (32). A connecting rod (34) is fixedly connected between the rear side of the adjustment block (32), the release rod (33), and the front side of the right angle plate (5). A stud (22) is threadedly connected through the side wall of the mobile frame (31). The side end of the stud (22) is rotatably connected to the side wall of the adjustment block (32). The front side of the bottom end of the release rod (33) is inclined.

2. The composite material strength testing device according to claim 1, characterized in that: A central electric telescopic cylinder (14) is fixedly connected to the middle of the side wall of the clamping seat (6). The output end of the central electric telescopic cylinder (14) passes through the side wall of the clamping seat (6) and is fixedly connected to the side wall of the connecting plate (9).

3. The composite material strength testing device according to claim 1, characterized in that: The T-shaped rod (12) has a side groove on its side wall, and an extrusion head (15) with a pressure sensor is fixedly connected to the inside of the side groove.

4. The composite material strength testing device according to claim 1, characterized in that: The front side of each T-shaped rod (12) is provided with a circular groove (16), and the upper circular rod (13) is slidably connected to the inside of the circular groove (16). An upper spring (17) is fixedly connected between the inside of the circular groove (16) and the side wall of the upper circular rod (13). The front side of each upper circular rod (13) is set as a smooth arc surface. The top of each right angle plate (5) is fixedly connected with a right angle block (18) with an inclined surface, and the inclined surface of the right angle block (18) is set on the side close to the L-shaped plate (4).

5. The composite material strength testing device according to claim 1, characterized in that: The front side of the T-shaped rod (12) is provided with a sliding groove, and the front side of the slide plate (11) is fixedly connected to a fixing plate (19) relative to the inner side of the sliding groove. The side wall of the fixing plate (19) and the inner side of the sliding groove are both fixedly connected to an upper return spring (20).

6. The composite material strength testing device according to claim 1, characterized in that: A pair of reset slots (35) are provided through the rear side of the L-shaped plate (4). A reset plate (36) is fixedly connected to the rear side of the slide plate (11) relative to the inner side of the reset slot (35). The reset plate (36) is slidably connected to the inner side of the reset slot (35). A lower reset spring (37) is fixedly connected between the inner side of the reset slot (35) and the side wall of the reset plate (36).

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