Device for detecting tensile property of carbon fiber composite material

Abstract

The invention relates to the technical field of carbon fiber composite material tensile property detection, in particular to a carbon fiber composite material tensile property detection device which comprises a main body, a lower clamping unit, an upper clamping unit, a lower coating unit and an upper coating unit. In the rotating process, the aluminum sheet is unfolded, and the end face, close to one side of the glue spraying part, of the aluminum sheet is subjected to glue spraying treatment, so that the aluminum sheet continuously coats the surface of the carbon fiber composite material sample in the right-front and left-back sequence, the aluminum sheet is tightly attached to the sample, the thicknesses of the coated positions on the upper and lower sides of the sample are uniform, and the clamping and fixing effect is prevented from being influenced; and the rear side, the left side and the right side of the sample sheet during detection are protected through the annular baffle plate, so that fragments of the carbon fiber sample are prevented from splashing to a test site, and the cleaning area is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile property detection of carbon fiber composite materials, and particularly to a tensile property detection device for carbon fiber composite materials. Background Technique

[0002] Carbon fiber composite materials are inorganic high-performance fibers with a carbon content higher than 90% that are transformed from organic fibers through a series of heat treatments. They are new materials with excellent mechanical properties, possessing the inherent nature characteristics of carbon materials and also having the soft processability of textile fibers. They are a new generation of reinforcing fibers. In order to evaluate and determine the mechanical properties of the materials in actual applications and ensure their reliability and safety in actual use, it is necessary to conduct tensile property detection on carbon fiber composite materials.

[0003] Before the tensile property detection of a carbon fiber composite material sample, it is necessary to manually wrap aluminum sheets around the areas to be clamped on the upper and lower sides of the sample and use glue for adhesion. After the glue solidifies, the sample with the wrapped aluminum sheets is placed into a tensile testing machine for a tensile test. When manually wrapping the aluminum sheets, there may be a situation where the aluminum sheets are not completely in close contact with the sample. At this time, the non-closely contacted parts will be filled with glue. After the glue solidifies later, the thickness of this position is greater than that of the other positions, thus affecting the subsequent clamping and fixing effect. During the tensile test, the sample may break, resulting in the splashing of carbon fiber fragments and polluting the test site, which requires subsequent cleaning. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide a tensile property detection device for carbon fiber composite materials to solve the technical problems in the related art that the uneven quality of the wrapped aluminum sheets affects the subsequent clamping and fixing, and the sample breakage causes fragment splashing and pollutes the site. To achieve the above purpose, the embodiments of the present application provide the following technical solutions.

[0005] A tensile property testing device for a carbon fiber composite material according to an embodiment of the present application includes a main body of a tensile testing machine. A lower clamping unit and an upper clamping unit are respectively arranged on the upper and lower sides between the base of the main body and the moving crossbeam. A lower covering unit and an upper covering unit are respectively arranged on the upper and lower sides between the base of the main body and the moving crossbeam. The upper covering unit and the lower covering unit are respectively used for covering aluminum sheets on the upper and lower surfaces of the carbon fiber composite material sample. The upper clamping unit and the lower clamping unit are respectively used for clamping and fixing the upper and lower sides of the carbon fiber composite material sample after covering the aluminum sheets. A linkage telescopic rod is fixedly connected between the lower end on the right side of the upper covering unit and the upper end on the right side of the lower covering unit. The inner end of the upper covering unit is rotatably connected with an annular guard plate with a front opening; A limiting part for limiting the bottom of the carbon fiber composite material sample is arranged at the upper end of the base of the main body. A driving motor is fixedly installed at the inner end on the right side of the base through a motor seat. The lower covering unit includes a driving part, a covering part and a glue spraying part. The output shaft of the driving motor is fixedly installed with a driving part through a coupling. A covering part for covering an aluminum sheet on the lower outer surface of the carbon fiber composite material sample is arranged at the upper end of the driving part. A glue spraying part is arranged on the driving part and on one side close to the central axis of the driving part. The glue spraying part sprays glue onto the surface of the aluminum sheet of the covering part. The driving part drives the covering part and the glue spraying part to rotate together along the central axis of the driving part to automatically cover the aluminum sheet on the lower outer surface of the carbon fiber composite material sample.

[0006] According to an embodiment of the present invention, the limiting part includes an electric push rod. An electric push rod is fixedly installed in the middle of the upper end of the base of the main body. A limiting block for limiting the lower end of the carbon fiber composite material sample is fixedly installed at the telescopic end of the electric push rod. A sample limiting groove matched with the carbon fiber composite material sample is opened in the middle of the limiting block. A lower support bracket is fixedly installed at the upper end of the base and on the left side of the electric push rod.

[0007] According to an embodiment of the present invention, the driving part includes a spur gear. The output shaft of the driving motor is fixedly installed with a spur gear through a coupling. An annular gear is rotatably connected to the lower support bracket. The annular gear meshes with the spur gear. An annular support plate is fixedly installed at the upper end of the annular gear. A linkage telescopic rod is fixedly connected between the lower end on the right side of the upper covering unit and the first spur gear.

[0008] According to an embodiment of the present invention, the covering part includes a limiting rod. A limiting rod is fixedly installed at the upper end of the annular support plate. A covering aluminum cylinder formed by winding a roll of aluminum sheet is sleeved on the limiting rod. A cylindrical groove is opened in the middle of the limiting rod. A half-turn thread groove is opened in the cylindrical groove. A right-angle plate is threadedly connected in the thread groove. A plurality of extrusion springs are uniformly fixedly installed at one end of the vertical section of the right-angle plate facing the central axis of the annular gear. The ends of the extrusion springs are jointly fixedly installed with an aluminum sheet extrusion plate that is in close contact with the outermost surface of the covering aluminum cylinder.

[0009] According to an embodiment of the present invention, the glue spraying part includes a sector-shaped fixing plate. The inner ring wall of the annular support plate is fixedly installed with a sector-shaped fixing plate. The upper end of the sector-shaped fixing plate is fixedly installed with a glue storage cylinder, which contains epoxy resin glue. The lower end of the sector-shaped fixing plate is fixedly installed with a micro delivery pump. The water inlet pipe of the micro delivery pump extends into the bottom of the glue storage cylinder. The end of the water outlet pipe of the micro delivery pump is fixedly installed with a delivery pipe. The arc surface of the glue storage cylinder is linearly and evenly fixedly installed with glue spray nozzles from top to bottom. A connecting pipe is fixedly installed between each glue spray nozzle and the delivery pipe.

[0010] According to an embodiment of the present invention, a fixing bracket is fixedly installed at the rear end of the base of the main body. A lower clamping unit is arranged at the front end of the horizontal section on the upper side of the fixing bracket. A rectangular plate is fixedly installed at the lower end of the middle part of the movable crossbeam of the main body. An upper clamping unit is fixedly installed at the lower end of the rectangular plate. A lower support bracket is fixedly installed on the upper end of the left side of the base of the main body. A lower covering unit is arranged on the lower support bracket. An upper support bracket is fixedly installed at the lower end of the left side of the movable crossbeam of the main body. An upper covering unit is arranged on the upper support bracket.

[0011] According to an embodiment of the present invention, the lower clamping unit includes a guide plate. The guide plate is fixedly installed at the front end of the horizontal section on the upper side of the fixing bracket. A rectangular guide groove is opened at the front end of the guide plate. A bidirectional screw is rotatably connected in the middle of the guide plate. Rectangular clamping blocks are symmetrically threaded on the left and right of the bidirectional screw. Both rectangular clamping blocks are slidably connected left and right with the guide groove.

[0012] According to an embodiment of the present invention, the structure of the upper clamping unit is the same as that of the lower clamping unit, and the structure of the upper covering unit is the same as that of the lower covering unit.

[0013] As can be seen from the above technical solutions, the present invention has the following advantages: 1. In the present invention, the covering part and the glue spraying part are driven by the driving part to rotate synchronously. During the rotation, the aluminum sheet unfolds and the end face on the side close to the glue spraying part is sprayed with glue. Then the aluminum sheet continues to cover the surface of the carbon fiber composite material sample in the order of right front left rear, ensuring that the aluminum sheet is closely attached to the sample, making the thickness of the covered parts on the upper and lower sides of the sample uniform, avoiding affecting the clamping and fixing effect and ultimately affecting the test results. The annular protective baffle protects the rear side and the left and right sides of the sample during detection, preventing the carbon fiber sample fragments from splashing onto the test site and reducing the cleaning area.

[0014] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions, the other technical problems that can be solved by the carbon fiber composite material tensile property detection device provided by the embodiments of the present application, the other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the 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 drawings can also be obtained according to the provided drawings.

[0016] Figure 1 Shows a front view three-dimensional structure schematic diagram provided according to an embodiment of the present invention.

[0017] Figure 2 Shows a front view three-dimensional structure schematic diagram of the present invention with the main body part structure removed.

[0018] Figure 3 Shows a front view cross-sectional plane structure schematic diagram of the present invention.

[0019] Figure 4 Shows a left view cross-sectional plane structure schematic diagram of the present invention.

[0020] Figure 5 Shows a top view plane structure schematic diagram of the lower covering unit of the present invention.

[0021] Figure 6 Shows Figure 5 A cross-sectional view taken along the A-A direction of

[0022] Figure 7 Shows Figure 6 A partial enlarged view at position N of

[0023] Figure 8 Shows a front view three-dimensional structure schematic diagram of the conveying pipe, the glue spray head and the connecting pipe.

[0024] Figure 9 Shows a process schematic diagram of the lower covering unit covering an aluminum sheet on a carbon fiber sample.

[0025] Among them, the above-mentioned drawings include the following reference numerals: 1, main body; 11, limiting part; 111, electric push rod; 112, limiting block; 113, sample limiting groove; 114, lower support bracket; 12, driving motor; 13, fixing bracket; 14, rectangular plate; 15, upper support bracket; 2, lower clamping unit; 21, guide plate; 22, guide groove; 23, bidirectional screw; 24, rectangular clamping block; 3, upper clamping unit; 4, lower covering unit; 41, driving part; 411, straight gear; 412, annular gear; 413, annular support plate; 42, covering part; 421, limiting rod; 422, covering aluminum cylinder; 423, cylindrical groove; 424, threaded groove; 425, right-angled plate; 426, extrusion spring; 427, aluminum sheet extrusion plate; 43, glue spraying part; 431, fan-shaped fixing plate; 432, glue storage cylinder; 433, micro delivery pump; 434, delivery pipe; 435, glue nozzle; 436, connecting pipe; 5, upper covering unit; 51, linkage telescopic rod; 52, annular guard plate. Detailed implementation manners

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific implementation manners of the present invention with reference to the drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] Refer to Figure 1 、 Figure 2 And Figure 3, a tensile property detection device for carbon fiber composite materials, including the main body 1 of a tensile testing machine. On the upper and lower sides between the base of the main body 1 and the moving crossbeam, a lower clamping unit 2 and an upper clamping unit 3 are respectively arranged. On the upper and lower sides between the base of the main body 1 and the moving crossbeam, a lower covering unit 4 and an upper covering unit 5 are respectively arranged. The upper covering unit 5 and the lower covering unit 4 are respectively used for covering aluminum sheets on the upper and lower surfaces of the carbon fiber composite material sample. The upper clamping unit 3 and the lower clamping unit 2 are respectively used for clamping and fixing the upper and lower sides of the carbon fiber composite material sample after covering aluminum sheets. A linkage telescopic rod 51 is fixedly connected between the lower end on the right side of the upper covering unit 5 and the upper end on the right side of the lower covering unit 4. The inner end of the upper covering unit 5 is rotatably connected with an annular guard plate 52 with a front opening; on the upper end of the base of the main body 1, a limiting part 11 for limiting the bottom of the carbon fiber composite material sample is arranged. Inside the right end of the base, a driving motor 12 is fixedly installed through a motor base. The lower covering unit 4 includes a driving part 41, a covering part 42 and a glue spraying part 43. The output shaft of the driving motor 12 is fixedly installed with the driving part 41 through a coupling. On the upper end of the driving part 41, a covering part 42 for covering the outer surface of the lower side of the carbon fiber composite material sample with an aluminum sheet is arranged. On the driving part 41 and on the side close to the central axis of the driving part 41, a glue spraying part 43 is arranged. The glue spraying part 43 sprays glue onto the surface of the aluminum sheet of the covering part 42. The driving part 41 drives the covering part 42 and the glue spraying part 43 to rotate together along the central axis of the driving part 41 to automatically cover the outer surface of the lower side of the carbon fiber composite material sample with an aluminum sheet.

[0028] Refer to Figure 1 , the structure of the upper clamping unit 3 is the same as that of the lower clamping unit 2, and the structure of the upper covering unit 5 is the same as that of the lower covering unit 4.

[0029] Refer to Figure 3 And Figure 4 , the limiting part 11 includes an electric push rod 111. In the middle of the upper end of the base of the main body 1, an electric push rod 111 is fixedly installed. The telescopic end of the electric push rod 111 is fixedly installed with a limiting block 112 for limiting the lower end of the carbon fiber composite material sample. A sample limiting groove 113 matching the carbon fiber composite material sample is opened in the middle of the limiting block 112. On the upper end of the base and on the left side of the electric push rod 111, a lower support bracket 114 is fixedly installed.

[0030] Refer to Figure 5 , Figure 6 And Figure 7, the covering part 42 includes a limiting rod 421. The limiting rod 421 is fixedly installed at the upper end of the annular support plate 413. A covering aluminum cylinder 422 composed of coiled aluminum sheets is sleeved on the limiting rod 421. A cylindrical groove 423 is opened in the middle of the limiting rod 421. A semi-circular thread groove 424 is opened in the cylindrical groove 423. A right-angle plate 425 is threadedly connected in the thread groove 424. The vertical section of the right-angle plate 425 is evenly fixedly installed with extrusion springs 426 at one end facing the central axis of the annular gear 412. The ends of the extrusion springs 426 are jointly fixedly installed with an aluminum sheet extrusion plate 427 that is in close contact with the outermost surface of the covering aluminum cylinder 422.

[0031] Refer to Figure 5 , Figure 6 and Figure 8 , the glue spraying part 43 includes a sector-shaped fixing plate 431. The sector-shaped fixing plate 431 is fixedly installed on the inner ring wall of the annular support plate 413. A glue containing cylinder 432 is fixedly installed at the upper end of the sector-shaped fixing plate 431. The glue containing cylinder 432 contains epoxy resin glue. A micro transfer pump 433 is fixedly installed at the lower end of the sector-shaped fixing plate 431. The water inlet pipe of the micro transfer pump 433 extends into the bottom of the glue containing cylinder 432. The end of the water outlet pipe of the micro transfer pump 433 is fixedly installed with a transfer pipe 434. Glue spray nozzles 435 are linearly and evenly fixedly installed on the arc surface of the glue containing cylinder 432 from top to bottom. A connecting pipe 436 is fixedly installed between each glue spray nozzle 435 and the transfer pipe 434.

[0032] First, hold the carbon fiber composite material sample by hand and insert it into the sample limiting groove 113 on the limiting block 112 to make the carbon fiber composite material sample in a vertical state. At this time, after the movable crossbeam drives the upper clamping unit 3 and the upper covering unit 5 to move down to a suitable position, unfold the covering aluminum cylinder 422, and draw the aluminum sheet to the left end of the sample in the order of right-front-left-back. During the drawing process, the glue in the glue containing cylinder 432 is sent to the glue spray nozzles 435 through the transfer pipe 434 and the connecting pipes 436 by the transfer pump and sprayed onto the end face of the aluminum sheet close to the glue containing cylinder 432. At this time, manually bend the aluminum sheet to make it in close contact with the surface of the carbon fiber composite material sample, and manually squeeze the aluminum sheet and the carbon fiber composite material sample.

[0033] Refer to Figure 3 , the driving part 41 includes a spur gear 411. The output shaft of the driving motor 12 is fixedly installed with a spur gear 411 through a coupling. An annular gear 412 is rotatably connected to the lower support bracket 114. The annular gear 412 meshes with the spur gear 411. The annular support plate 413 is fixedly installed at the upper end of the annular gear 412. A linkage telescopic rod 51 is fixedly connected between the lower right side of the upper covering unit 5 and the spur gear 411.

[0034] Refer to Figure 9, the driving motor 12 drives the spur gear 411 to rotate. The spur gear 411 drives the ring gear 412 to rotate, and the ring gear 412 drives the ring support plate 413 to rotate, thereby driving the aluminum-coated cylinder 422 and the glue storage cylinder 432 to rotate together. During the rotation process, the aluminum sheet continues to unfold and is spray-coated on the end face on the side close to the glue storage cylinder 432, so that the aluminum sheet continues to wrap the surface of the carbon fiber composite material sample in the order of right-front-left-back. After the aluminum sheet has completed one and a half laps, there is no need to manually press the aluminum sheet and the carbon fiber composite material sample anymore. At this time, the ring support plate 413 continues to rotate until the aluminum sheet has completed two full laps. At this time, the driving motor 12 stops working, the spur gear 411 no longer rotates, and a cutting tool is used to cut the aluminum sheet so that the aluminum sheet on the aluminum-coated cylinder 422 no longer winds around the surface of the carbon fiber composite material sample. Driven by the linkage telescopic rod 51, the upper covering unit 5 on the upper side performs the same action, and at the same time covers and cuts the aluminum sheet on the upper side of the carbon fiber composite material sample.

[0035] Refer to Figure 3 and Figure 4 , a fixed bracket 13 is fixedly installed at the rear end of the base of the main body 1. A lower clamping unit 2 is arranged at the front end of the upper horizontal section of the fixed bracket 13. A rectangular plate 14 is fixedly installed at the lower end of the middle part of the movable cross beam of the main body 1. An upper clamping unit 3 is fixedly installed at the lower end of the rectangular plate 14. A lower support bracket 114 is fixedly installed at the upper left end of the base of the main body 1. A lower covering unit 4 is arranged on the lower support bracket 114. An upper support bracket 15 is fixedly installed at the lower left end of the movable cross beam of the main body 1. An upper covering unit 5 is arranged on the upper support bracket 15.

[0036] Refer to Figure 3 and Figure 4 , the lower clamping unit 2 includes a guide plate 21. The guide plate 21 is fixedly installed at the front end of the upper horizontal section of the fixed bracket 13. A rectangular guide groove 22 is formed at the front end of the guide plate 21. A bidirectional screw 23 is rotatably connected to the middle of the guide plate 21. Rectangular clamping blocks 24 are symmetrically threadedly connected to the left and right of the bidirectional screw 23. Both rectangular clamping blocks 24 are slidably connected to the left and right in the guide groove 22.

[0037] Drive the limit block 112 to move upward through the electric push rod 111, so that the aluminum sheets wrapped on the upper and lower sides of the carbon fiber composite material sample move into the upper clamping unit 3 and the lower clamping unit 2 on the upper and lower sides. At this time, drive the bidirectional screw 23 to rotate through the external drive motor 12, drive the rectangular clamping blocks 24 to move towards each other, and the upper clamping unit 3 performs the same movement, so as to clamp and fix the upper and lower sides of the carbon fiber composite material sample with the same aluminum sheet thickness on the left and right sides at the same time. At this time, start the movable crossbeam of the main body 1, and the movable crossbeam moves upward to stretch the carbon fiber composite material sample. When the carbon fiber composite material sample breaks, the control system of the main body 1 will detect the abnormal change of the tensile force data, so as to trigger the instruction to stop running. At this time, the data can be recorded and compared with the standard data to judge whether the tensile performance of the carbon fiber composite material sample meets the standard. Multiple tests can be carried out as needed, the average value can be calculated, and compared with the standard data to judge the required information. Protect the rear side and the left and right sides of the sample piece through the annular baffle 52.

[0038] The working principle of the present invention: The first step: First, hold the carbon fiber composite material sample and insert it into the limiting part 11, so that the carbon fiber composite material sample is in a vertical state. At this time, after the movable crossbeam drives the upper clamping unit 3 and the upper covering unit 5 to move down to a suitable position, unfold the aluminum sheet in the covering part 42, and pull the aluminum sheet to the left end of the sample in the order of right front left rear. During the pulling process, spray glue from the glue spraying part 43 onto the end face of the aluminum sheet on the side close to the glue spraying part 43. At this time, manually bend the aluminum sheet to make the aluminum sheet closely adhere to the surface of the carbon fiber composite material sample, and manually squeeze the aluminum sheet and the carbon fiber composite material sample.

[0039] The second step: At this time, drive the drive part 41 to rotate through the drive motor 12, so as to drive the covering part 42 and the glue spraying part 43 to rotate together. During the rotation process, the aluminum sheet continues to unfold and the end face of the side close to the glue spraying part 43 is sprayed with glue, so that the aluminum sheet continues to cover the surface of the carbon fiber composite material sample in the order of right front left rear. After the aluminum sheet has completed one and a half circles completely, there is no need to continue manually pressing the aluminum sheet and the carbon fiber composite material sample. At this time, the drive part 41 continues to rotate until the aluminum sheet has completed two circles completely. At this time, the drive motor 12 stops working and the drive part 41 no longer rotates. Hold the cutting tool to cut the aluminum sheet so that the aluminum sheet on the covering part 42 no longer winds around the surface of the carbon fiber composite material sample. Driven by the linkage telescopic rod 51, the upper covering unit 5 on the upper side performs the same action, and at the same time covers the aluminum sheet and cuts the aluminum sheet on the upper side of the carbon fiber composite material sample. After the aluminum sheets at the upper and lower ends of the carbon fiber composite material sample have been covered and cut.

[0040] Step 3: At this time, the limiting part 11 moves upward, so that the aluminum sheets wrapped around the upper and lower sides of the carbon fiber composite material sample are moved into the upper clamping unit 3 and the lower clamping unit 2 on the upper and lower sides. At this time, the external driving motor 12 is used to drive the lower clamping unit 2 and the upper clamping unit 3 to move, so as to clamp and fix the upper and lower sides of the carbon fiber composite material sample with the same thickness of the aluminum sheets on the left and right sides at the same time. Then, the annular guard plate 52 is toggled to make its opening face forward. At this time, the movable crossbeam of the main body 1 is started, and the movable crossbeam moves upward to stretch the carbon fiber composite material sample. When the carbon fiber composite material sample breaks, the control system of the main body 1 will detect the abnormal change of the tensile force data, so as to trigger the instruction to stop running. At this time, the data can be recorded and compared with the standard data to judge whether the tensile performance of the carbon fiber composite material sample meets the standard. Multiple tests can be carried out as needed, the average value can be calculated, and compared with the standard data to judge the required information. The rear side and the left and right sides of the sample are protected by the annular guard plate 52.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "middle part", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "end", "axial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0042] In addition, the terms "first", "second", "No. 1", "No. 2", "one", "two" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, a sliding connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] The embodiments of the present specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A carbon fiber composite material tensile properties testing device, characterized in that: It includes a main body of the tensile testing machine, a lower clamping unit and an upper clamping unit are respectively arranged on the lower and upper sides between the base of the main body and the movable crossbeam, a lower covering unit and an upper covering unit are respectively arranged on the lower and upper sides between the base of the main body and the movable crossbeam, the upper covering unit and the lower covering unit are respectively used to cover the upper side surface and the lower side surface of the carbon fiber composite material sample with aluminum sheets, the upper clamping unit and the lower clamping unit are respectively used to clamp and fix the upper and lower sides of the carbon fiber composite material sample after the aluminum sheets are covered, a linkage telescopic rod is fixedly connected between the lower end of the right side of the upper covering unit and the upper end of the right side of the lower covering unit, and the inner end of the upper covering unit is rotatably connected to a ring-shaped guard plate with a front opening; A limiting portion for limiting the bottom of the carbon fiber composite material sample is arranged at the upper end of the base of the main body, a driving motor is fixedly installed at the right inner end of the base through a motor seat, the lower covering unit comprises a driving portion, a covering portion and a glue spraying portion, the driving portion is fixedly installed on the output shaft of the driving motor through a coupling, a covering portion for covering the lower outer surface of the carbon fiber composite material sample with an aluminum sheet is arranged at the upper end of the driving portion, a glue spraying portion is arranged on the driving portion and on one side close to the central axis of the driving portion, the glue spraying portion sprays glue onto the surface of the aluminum sheet of the covering portion, the driving portion drives the covering portion and the glue spraying portion to rotate together along the central axis of the driving portion, and the lower outer surface of the carbon fiber composite material sample is automatically covered with the aluminum sheet.

2. A carbon fiber composite material tensile properties testing device according to claim 1, characterized in that: The limiting part includes an electric push rod, which is fixedly installed in the middle of the upper end of the base of the main body, and a limiting block for limiting the lower end of the carbon fiber composite material sample is fixedly installed at the telescopic end of the electric push rod. A sample limiting groove matching the carbon fiber composite material sample is opened in the middle of the limiting block, and a lower supporting bracket is fixedly installed on the upper end of the base and on the left side of the electric push rod.

3. A carbon fiber composite material tensile properties testing device according to claim 1, characterized in that: The driving part includes a spur gear, and the output shaft of the driving motor is fixedly installed with the spur gear through a coupling. A ring gear is rotatably connected to the lower supporting bracket, and the ring gear is meshed with the spur gear. An annular supporting plate is fixedly installed on the upper end of the ring gear, and a linkage telescopic rod is fixedly connected between the lower end of the right side of the upper covering unit and the spur gear one.

4. A carbon fiber composite material tensile property testing device according to claim 3, characterized in that: The covering part comprises a limiting rod, the limiting rod is fixedly installed on the upper end of the annular support plate, a covering aluminum cylinder composed of rolled aluminum sheets is sleeved on the limiting rod, a cylindrical groove is opened in the middle of the limiting rod, and a half-circle thread groove is opened in the cylindrical groove.

5. A carbon fiber composite material tensile property testing device according to claim 4, characterized in that: A right-angle plate is connected to the inner thread of the thread groove, and an extrusion spring is evenly fixedly installed on one end of the vertical section of the right-angle plate facing the central axis of the ring gear, and an aluminum sheet extrusion plate tightly attached to the outermost surface of the coated aluminum cylinder is fixedly installed at the end of the extrusion spring.

6. A carbon fiber composite material tensile property testing device according to claim 1, characterized in that: The glue spraying part comprises a fan-shaped fixing plate, the inner ring wall of the annular support plate is fixedly mounted with the fan-shaped fixing plate, the upper end of the fan-shaped fixing plate is fixedly mounted with a glue cylinder, and the glue cylinder is filled with epoxy resin glue.

7. A carbon fiber composite material tensile property testing device according to claim 6, characterized in that: A micro-delivery pump is fixedly installed at the lower end of the fan-shaped fixed plate, the water inlet pipe of the micro-delivery pump extends into the bottom of the glue cylinder, and a delivery pipe is fixedly installed at the end of the water outlet pipe of the micro-delivery pump. Glue nozzles are fixedly installed linearly and evenly along the curved surface of the glue cylinder from top to bottom, and a connecting pipe is fixedly installed between the glue nozzle and the delivery pipe.

8. A carbon fiber composite material tensile property testing device according to claim 2, characterized in that: A fixed bracket is fixedly installed at the rear end of the base of the main body, a lower clamping unit is arranged at the front end of the upper horizontal section of the fixed bracket, a rectangular plate is fixedly installed at the lower end of the middle part of the movable crossbeam of the main body, an upper clamping unit is fixedly installed at the lower end of the rectangular plate, a lower supporting bracket is fixedly installed at the left side of the upper end of the base of the main body, a lower covering unit is arranged on the lower supporting bracket, an upper supporting bracket is fixedly installed at the left side of the lower end of the movable crossbeam of the main body, and an upper covering unit is arranged on the upper supporting bracket.

9. The carbon fiber composite material tensile property testing device according to claim 1, characterized in that: The lower clamping unit includes a guide plate, and the guide plate is fixedly installed at the front end of the upper horizontal section of the fixed bracket. A rectangular guide groove is opened at the front end of the guide plate. A bidirectional screw is rotatably connected to the middle of the guide plate. The bidirectional screw is symmetrically threaded with a rectangular clamping block. The two rectangular clamping blocks are both connected to the guide groove for left and right sliding.

10. The carbon fiber composite material tensile property testing device according to claim 1, characterized in that: The structure of the upper clamping unit is the same as that of the lower clamping unit, and the structure of the upper covering unit is the same as that of the lower covering unit.

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