An environmental test device for carbon fiber composite materials

Abstract

The present invention discloses an environmental test device for carbon fiber composite materials, which includes a high-temperature environmental chamber, a low-temperature environmental chamber, and a robotic arm; the high-temperature environmental chamber is provided with a seawater tank, and a heating pipeline for heating seawater is arranged in the seawater tank. A rotatable turntable is arranged in the high-temperature environmental chamber, and a first specimen placement rack is arranged between the turntables; a first temperature and humidity sensor for monitoring the internal environment of the chamber is arranged in the high-temperature environmental chamber, and a ventilation port is arranged on the side wall; a second specimen placement rack, a refrigeration pipeline, a stretching component, and a second temperature and humidity sensor are arranged inside the low-temperature environmental chamber. The refrigeration pipeline is connected to a compressor outside the box through a low-temperature transmission pipeline. The stretching component includes a stretching fixture and a hydraulic rod for driving the stretching fixture. This test device can realize a device for performing various environmental tests on carbon fiber composite materials, and can directly perform mechanical tests under low-temperature environments, improving the working efficiency of the environmental test chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber, and particularly to a device for environmental testing of carbon fiber composites. Background Art

[0002] Carbon fiber composites have the advantages of high specific strength, high specific modulus, good fatigue resistance, etc., and are increasingly used in the fields of aerospace, rail transit, etc. However, different environments will cause different forms of damage to the matrix and fibers of carbon fiber composites, resulting in changes in the material properties of carbon fiber composites and certain losses.

[0003] The environmental test chamber for carbon fiber composites can be used to detect the mechanical properties of products under high temperature, humid heat, seawater, and low temperature. The traditional high and low temperature environmental chamber for carbon fiber only has two environments of high temperature and low temperature, and there is no situation of synchronously carrying out seawater or salt spray humidity. Moreover, it cannot directly perform mechanical tests by stretching inside the environmental chamber. Conducting multiple groups of tests takes a long time. Moreover, for the low temperature environmental test of carbon fiber composites, if the test piece is taken out of the environmental chamber and then a tensile mechanical test is carried out, when the test piece changes from a low temperature to a normal temperature state, it will inevitably cause dew drops to form on the surface of the test piece, changing the humidity and temperature of the test piece, thereby affecting the accuracy of the test. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for environmental testing of carbon fiber composites. This test device can realize a device for performing various environmental tests on carbon fiber composites, and can directly perform mechanical tests under low temperature environments, improving the working efficiency of the environmental test chamber.

[0005] To achieve the above purpose, the present invention provides a device for environmental testing of carbon fiber composites, including a high temperature environmental chamber, a low temperature environmental chamber, and a robotic arm; a seawater tank is provided at the bottom of the high temperature environmental chamber, and a heating pipeline for heating seawater is provided in the seawater tank. A rotatable turntable is provided in the high temperature environmental chamber, and a first test piece placement rack is provided between the turntables. A part of the turntable is located inside the seawater tank, and the other part is higher than the seawater tank; a first temperature and humidity sensor for monitoring the environment inside the chamber is provided in the high temperature environmental chamber, and ventilation holes are provided on the side wall of the high temperature environmental chamber; a second test piece placement rack, a refrigeration pipeline located below the second test piece placement rack, a stretching assembly located above the second test piece placement rack, and a second temperature and humidity sensor are provided inside the low temperature environmental chamber. The refrigeration pipeline is connected to a compressor outside the box body through a low temperature transmission pipeline. The stretching assembly includes a stretching fixture and a hydraulic rod for driving the stretching fixture, and a load sensor is provided on the stretching fixture.

[0006] Optionally, the hydraulic rod includes a first hydraulic rod and a second hydraulic rod that are arranged at intervals up and down and are parallel to each other. The stretching fixture is located between the first hydraulic rod and the second hydraulic rod. The movable ends of the first hydraulic rod, the second hydraulic rod, and the stretching fixture all extend outward through the side wall of the low-temperature environmental chamber. The movable end of the stretching fixture is connected to the movable ends of the first hydraulic rod and the second hydraulic rod through a connecting rod and a fixing block, and the load sensor is arranged between the connecting rod and the movable end of the stretching fixture.

[0007] Optionally, a horizontal rotating shaft is provided inside the high-temperature environmental chamber, and the turntable is installed on the horizontal rotating shaft.

[0008] Optionally, the turntable includes a first turntable and a second turntable that are arranged at intervals left and right and are parallel to each other. The first specimen placement rack is arranged between the first turntable and the second turntable.

[0009] Optionally, the number of the first specimen placement racks is multiple, and the multiple first specimen placement racks are distributed circumferentially around the horizontal rotating shaft.

[0010] Optionally, the high-temperature environmental chamber and the low-temperature environmental chamber are respectively provided with chamber doors that can automatically lift with the moving action of the robotic arm. The high-temperature environmental chamber and the low-temperature environmental chamber are provided with guide grooves and gaskets for guiding the lifting of the chamber doors.

[0011] Optionally, the chamber doors of the high-temperature environmental chamber and the low-temperature environmental chamber are respectively provided with observation windows of double-layer heat-insulating glass.

[0012] Optionally, a gripper for gripping a specimen or a specimen placement rack for carrying is provided at the end of the robotic arm.

[0013] Optionally, guide rails are provided on the outer sides of the high-temperature environmental chamber and the low-temperature environmental chamber, and the robotic arm is movably installed on the guide rails.

[0014] Optionally, a xenon lamp is provided at the inner top of the high-temperature environmental chamber.

[0015] The carbon fiber composite material environmental test device provided by the present invention can simulate the environments of the underwater area, the water splash area on the water surface, and the salt spray area above the water in a high-temperature environmental chamber, and can periodically simulate the changes in various different environments through the rotation of the first specimen placement rack. In a low-temperature environmental chamber, a low-temperature environmental test can be carried out on the carbon fiber composite material. Without taking the specimen out of the low-temperature environmental chamber, a tensile mechanical test can be directly carried out, avoiding the change of the specimen from a low-temperature environment to a normal-temperature environment, which may cause dew drops to form on the surface of the specimen, changing the humidity and temperature of the specimen, thereby affecting the accuracy of the test. Moreover, when using two environmental test chambers to carry out an alternating temperature test, it is not necessary to change the temperature of a single environmental chamber, which can save time. On the other hand, both environmental chambers can work independently, which can increase the specimen capacity while accelerating the test. In addition, by using a robotic arm for handling, not only can the safety of the operator be ensured, but also the work efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a carbon fiber composite material environmental test device provided by an embodiment of the present invention;

[0017] Figure 2 is Figure 1 a schematic cross-sectional view in the front view direction of the carbon fiber composite material environmental test device shown;

[0018] Figure 3 is Figure 1 a side view of the carbon fiber composite material environmental test device shown.

[0019] In the figure:

[0020] 1. Door; 2-1. High-temperature environmental chamber; 2-2. Low-temperature environmental chamber; 3. Hydraulic rod; 3-1. First hydraulic rod; 3-2. Second hydraulic rod; 4. Load sensor; 5. Fixed block; 6. Low-temperature transmission pipeline; 7. Compressor; 8. Second specimen placement rack; 9. Robotic arm; 10. Seawater tank; 11. Gripper; 12. Specimen; 13. Turntable; 13-1. First turntable; 13-2. Second turntable; 14. First specimen placement rack; 15. Observation window; 16. Second temperature and humidity sensor; 17. Tensile fixture; 18. Refrigeration pipeline; 19. Heating pipe; 20. First temperature and humidity sensor; 21. Xenon lamp; 22. Specimen; 23. Ventilation hole DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to enable those skilled in the art 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.

[0022] In this text, terms such as "upper, lower, inner, outer" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they should not be understood as absolute limitations on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0023] Please refer to Figures 1 to 3 , Figure 1 which is a schematic diagram of the overall structure of an environmental test device for carbon fiber composite materials provided by an embodiment of the present invention; Figure 2 is Figure 1 a schematic cross-sectional view in the front view direction of the carbon fiber composite material environmental test device shown; Figure 3 is Figure 1 a side view of the carbon fiber composite material environmental test device shown.

[0024] In a specific embodiment, the environmental test device for carbon fiber composite materials provided by the present invention uses a combination of a high-temperature environmental chamber and a low-temperature environmental chamber. It mainly consists of a high-temperature environmental chamber 2-1, a low-temperature environmental chamber 2-2, and a robotic arm 9. The high-temperature environmental chamber 2-1 and the low-temperature environmental chamber 2-2 are arranged side by side and can be an integrated structure. Using two environmental chambers can reduce the large amount of time required for the temperature change of a single environmental chamber during high-low temperature alternating tests.

[0025] Guide rails (not shown in the figure) are provided on the outer sides of the high-temperature environmental chamber 2-1 and the low-temperature environmental chamber 2-2. The robotic arm 9 is movably installed on the guide rails. A gripper 11 is provided at the end of the robotic arm 9, which can grip the test piece or the test piece placement rack and transfer it between the two environmental chambers. Using the robotic arm 9 not only ensures the safety of the operator but also improves work efficiency, and can transfer the test piece at regular intervals according to the test requirements.

[0026] A seawater tank 10 is provided at the bottom of the high-temperature environmental chamber 2-1. The seawater tank 10 is provided with a seawater discharge port and a seawater injection pipeline. A heating pipeline 19 for heating seawater is provided in the seawater tank 10. A rotatable turntable 13 is provided in the high-temperature environmental chamber 2-1, and a first test piece placement rack 14 is provided between the turntables 13. A part of the turntable 13 is located inside the seawater tank 10, and the other part protrudes above the seawater tank 10.

[0027] Specifically, a horizontal rotating shaft is provided inside the high-temperature environmental chamber 2-1. The turntable 13 is installed on the horizontal rotating shaft. The turntable 13 is divided into a first turntable 13-1 and a second turntable 13-2 that are spaced left and right and parallel to each other. The first specimen placement rack 14 is provided between the first turntable 13-1 and the second turntable 13-2. Moreover, the number of the first specimen placement racks 14 is multiple, and the multiple first specimen placement racks 14 are distributed circumferentially around the horizontal rotating shaft.

[0028] When the rotating shaft rotates, it will drive the first turntable 13-1 and the second turntable 13-2 to rotate together, so that a part of the first specimen placement racks 14 are immersed in the seawater tank 10, and the other part of the first specimen placement racks 14 are located above the seawater tank 10. That is to say, through the rotation of the first specimen placement racks 14, the changes of various different environments can be periodically simulated, meeting the test requirements of multiple environments such as the underwater area, the splash area on the water surface, and the salt spray area above the water.

[0029] The connection method of the first specimen placement rack 14 with the first turntable 13-1 and the second turntable 13-2 can be either fixed or freely rotatable. If the freely rotatable connection method is adopted, the first specimen placement rack 14 always remains horizontal during the rotation of the turntable 13. If the fixed connection method is adopted, the specimen 12 can be positioned on the first specimen placement rack 14 to prevent the specimen 12 from falling off the first specimen placement rack 14 during the test.

[0030] A first temperature and humidity sensor 20 is provided inside the high-temperature environmental chamber 2-1 to monitor the environment inside the chamber. Ventilation holes 23 are provided on the side wall of the high-temperature environmental chamber 2-1. The seawater in the seawater tank 10 can be directly heated through the heating pipeline 19, and then the salt spray, temperature, and humidity inside the high-temperature environmental chamber 2-1 can be controlled. The first temperature and humidity sensor 20 can automatically monitor the environment inside the chamber, and then by controlling the ventilation holes 23, the temperature and humidity conditions inside the high-temperature environmental chamber 2-1 can be adjusted to meet the test requirements.

[0031] A xenon lamp 21 is provided at the inner top of the high-temperature environmental chamber 2-1 to simulate actual light.

[0032] Inside the low-temperature environmental chamber 2-2, there are a second specimen placement rack 8, a refrigeration pipeline 18, a stretching assembly, and a second temperature and humidity sensor 16. Among them, the refrigeration pipeline 18 is located below the second specimen placement rack 16, and the stretching assembly is located above the second specimen placement rack 16. The refrigeration pipeline 18 is connected to the compressor 7 outside the box through a low-temperature transmission pipeline 6. The refrigeration pipeline 18 is located at the bottom of the low-temperature environmental chamber 2-2 and below the second specimen placement rack 8, which can effectively cool down and reduce space occupation. The stretching assembly mainly consists of a stretching fixture 17 and a hydraulic rod 3 that drives the stretching fixture, and a load sensor 4 is provided on the stretching fixture 17. By setting the stretching fixture 17, a stretching test can be carried out under low-temperature conditions to analyze the influence of low temperature on materials.

[0033] Specifically, the hydraulic rod 3 is divided into a first hydraulic rod 3-1 and a second hydraulic rod 3-2 that are arranged at intervals up and down and are parallel to each other. The stretching fixture 17 is located between the first hydraulic rod 3-1 and the second hydraulic rod 3-2. There are through holes opened on the side of the low-temperature environmental chamber 2-2. One end of the first hydraulic rod 3-1 or the second hydraulic rod 3-2 is fixed, and the other end passes through the corresponding through hole and extends outwards. Similarly, one end of the stretching fixture 17 is fixed, and the other end passes through the corresponding through hole and extends outwards. Double-layer gasket treatment is added at the opening positions. The movable end of the stretching fixture 17 is connected to the movable ends of the first hydraulic rod 3-1 and the second hydraulic rod 3-2 through a connecting rod and a fixed block 5. When the first hydraulic rod 3-1 and the second hydraulic rod 3-2 expand and contract synchronously, a load can be applied to the stretching fixture 17. A load sensor 4 is provided between the connecting rod and the stretching fixture 17 to monitor the change of the load during loading.

[0034] The second specimen placement rack 8 in the low-temperature environmental chamber 2-2 can perform low-temperature treatment on multiple groups of specimens at one time. Subsequently, a tensile mechanical test can be directly carried out in the box without performing low-temperature tests on individual specimens one by one, which improves the efficiency and saves time. And it avoids taking the specimen out of the low temperature and contacting the outside world, preventing the formation of condensation from affecting the specimen.

[0035] The high-temperature environmental chamber 2-1 and the low-temperature environmental chamber 2-2 are respectively provided with a box door 1 that can automatically lift and lower with the moving action of the robotic arm 9.

[0036] In this embodiment, the box doors 1 of the two environmental chambers can be automatically controlled to lift, open and close with the handling of the robotic arm 9. There are guide grooves and gaskets provided at the box body. The box door 1 can realize the lifting movement through the guide grooves and the motor, and there are gaskets at the edge to ensure sufficient sealing performance. And its observation window 15 is double-layer heat-insulating glass to reduce temperature changes.

[0037] When conducting an environmental test on a carbon fiber composite material, this test device can perform environmental treatment on multiple groups of specimens at one time.

[0038] The first test condition:

[0039] When conducting the high and low temperature and humidity alternating environment test, the external specimen 12 is clamped by the gripper 11 of the robotic arm 9, and then placed on the first specimen placement rack 14. The heating system is turned on to raise the temperature, the xenon lamp 21 is turned on to simulate light, and the heating pipeline 19 starts to heat the seawater in the seawater tank 10 and the environmental chamber. While raising the temperature, the humidity and salt mist in the environmental chamber are increased to simulate the environmental conditions of the natural marine environment. The first temperature and humidity sensor 20 in the chamber monitors the environmental conditions in the chamber. If there are fluctuations, the exhaust can be controlled through the ventilation hole 23 to control the temperature and humidity.

[0040] At this time, the specimens located below the first specimen placement rack 14 are immersed in seawater, and the specimens located above the first specimen placement rack 14 are in a high-temperature and humid environment. When the specified time is reached, the chamber door 1 is opened, and the gripper 11 of the robotic arm 9 clamps the specimen from the high-temperature environmental chamber 2-1 to the low-temperature environmental chamber 2-2. After the chamber door 1 is closed, the compressor 7 starts to work, the refrigerant is transmitted through the low-temperature transmission pipeline 6, and then the refrigeration pipe 18 starts to refrigerate for the low-temperature test. The second temperature and humidity sensor 16 monitors the temperature conditions in the environmental chamber.

[0041] In this way, the specimen can be subjected to multiple environmental alternating tests. When the test time requirement is reached, the specimen can be placed in the low-temperature environmental chamber and clamped by the tensile fixture 17. Subsequently, driven by the hydraulic rod 3, the fixed block 5 drives the tensile fixture 17 to conduct the mechanical tensile test. The test data is detected by the load sensor 4 and analyzed and recorded.

[0042] The second test condition:

[0043] When conducting the high-temperature and humidity environment test, the specimen is placed on the first specimen placement rack 14 by the gripper 11 of the robotic arm 9. The high-temperature seawater salt mist environmental chamber closes the chamber door 1, the xenon lamp 21 is turned on, and the heating pipe 19 below the seawater tank 10 starts to heat. The temperature conditions in the environmental chamber are monitored by the first temperature and humidity sensor 20, and the exhaust is controlled through the ventilation hole 23 to control the temperature and humidity in the environmental chamber.

[0044] The specimen placement rack 14 can be rotated according to the time of the seawater immersion environment and the high-temperature and humidity environment specified in the test requirements. The specimen placement rack 14 is connected to the turntable 13. Driven by the turntable 13, the specimen is periodically in the seawater immersion or high-temperature and humidity salt mist environment, which can meet the periodic test requirements.

[0045] After the environmental test is completed, the specimen is taken out and placed in the low-temperature environmental chamber. It can be on the tensile fixture 17. Subsequently, driven by the hydraulic rod 3, the fixed block 5 drives the tensile fixture 17 to conduct the tensile test. The experimental data is detected by the load sensor 4, and the mechanical properties of the specimen are analyzed.

[0046] The third test condition:

[0047] When conducting the low-temperature environment test, the gripper 11 of the robotic arm 9 places the test piece on the second test-piece placement rack 8, and the chamber door 1 is closed. The compressor 7 starts to operate, the low-temperature transmission pipeline 6 transmits the refrigerant, the refrigeration pipe 18 starts to refrigerate, the temperature inside the low-temperature environment chamber decreases, and refrigeration is monitored by the second temperature and humidity sensor 16.

[0048] After reaching the time set for the test requirements in the low-temperature environment, a single test piece 22 is fixed on the tensile fixture 17. Subsequently, driven by the hydraulic rod 3, the fixed block 5 drives the tensile fixture 17 to conduct a tensile mechanical test, and the load sensor 4 detects the data to test the mechanical properties of the test piece.

[0049] The above embodiments are only the preferred solutions of the present invention, and are not specifically limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation manners. For example, changing the turntable 13 to a bracket, or driving the tensile fixture 17 in other ways, etc. Since there are many possible implementation manners, they will not be listed one by one here.

[0050] The present invention uses two environmental chambers, which can reduce the large amount of time required for the temperature change of a single high and low temperature environmental chamber during high and low temperature alternating tests. Moreover, the two environmental chambers can be modularly selected according to task requirements to meet the test requirements of various environments, such as underwater areas, water splash areas, and above-water salt spray areas, etc. And through the rotation of the test-piece rack, the changes of various different environments can be periodically simulated. The low-temperature environmental chamber 2-2 can perform tensile tests at low temperatures to analyze the impact of low temperature on materials.

[0051] In addition, by using the robotic arm 9, while ensuring the safety of the operator, the work efficiency is also improved, effectively avoiding the danger of manually transporting test pieces into the high and low temperature environment in the existing high and low temperature environmental chambers, and improving the test efficiency.

[0052] The above has introduced in detail the carbon fiber composite material environmental test device provided by the present invention. 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 core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still 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. An environmental test device for carbon fiber composite materials, characterized in that, It includes a high-temperature environmental chamber (2-1), a low-temperature environmental chamber (2-2) and a robotic arm (9); a seawater tank (10) is provided at the bottom of the high-temperature environmental chamber (2-1), a heating pipeline (19) for heating seawater is provided in the seawater tank (10), a rotatable turntable (13) is provided in the high-temperature environmental chamber (2-1), and a first specimen placement rack (14) is provided between the turntables (13). A part of the turntable (13) is located inside the seawater tank (10), and the other part protrudes above the seawater tank (10); a first temperature and humidity sensor (20) for monitoring the internal environment of the chamber is provided in the high-temperature environmental chamber (2-1), and ventilation holes (23) are provided on the side wall of the high-temperature environmental chamber (2-1); a second specimen placement rack (8), a refrigeration pipeline (18) located below the second specimen placement rack (8), a stretching assembly located above the second specimen placement rack (8) and a second temperature and humidity sensor (16) are provided inside the low-temperature environmental chamber (2-2). The refrigeration pipeline (18) is connected to a compressor (7) outside the box body through a low-temperature transmission pipeline (6). The stretching assembly includes a stretching fixture (17) and a hydraulic rod (3) for driving the stretching fixture (17), and a load sensor (4) is provided on the stretching fixture (17).

2. The carbon fiber composite material environmental test device according to claim 1, wherein The hydraulic rod (3) includes a first hydraulic rod (3-1) and a second hydraulic rod (3-2) which are arranged at intervals up and down and are parallel to each other. The stretching fixture (17) is located between the first hydraulic rod (3-1) and the second hydraulic rod (3-2); the moving ends of the first hydraulic rod (3-1), the second hydraulic rod (3-2) and the stretching fixture (17) all extend outward through the side wall of the low-temperature environmental chamber (2-2). The moving end of the stretching fixture (17) is connected to the moving ends of the first hydraulic rod (3-1) and the second hydraulic rod (3-2) through a connecting rod and a fixing block (5), and the load sensor (4) is arranged between the connecting rod and the moving end of the stretching fixture (17).

3. The carbon fiber composite material environmental test device according to claim 1, characterized in that, A horizontal rotating shaft is provided inside the high-temperature environmental chamber (2-1), and the turntable (13) is installed on the horizontal rotating shaft.

4. The carbon fiber composite material environmental test device according to claim 3, characterized in that The turntable (13) includes a first turntable (13-1) and a second turntable (13-2) which are arranged at intervals left and right and are parallel to each other. The first specimen placement rack (14) is arranged between the first turntable (13-1) and the second turntable (13-2).

5. The carbon fiber composite material environmental test device according to claim 4, characterized in that, The number of the first specimen placement racks (14) is multiple, and the multiple first specimen placement racks (14) are distributed circumferentially around the horizontal rotating shaft.

6. The carbon fiber composite material environmental test device according to claim 1, characterized in that, The high-temperature environmental chamber (2-1) and the low-temperature environmental chamber (2-2) are respectively provided with a chamber door (1) that can automatically lift with the moving action of the robotic arm (9). The high-temperature environmental chamber (2-1) and the low-temperature environmental chamber (2-2) are provided with a guide groove and a sealing gasket for guiding the lifting of the chamber door (1).

7. The carbon fiber composite material environmental test device according to claim 6, characterized in that, The chamber doors (1) of the high-temperature environmental chamber (2-1) and the low-temperature environmental chamber (2-2) are respectively provided with an observation window (15) of double-layer heat-insulating glass.

8. The carbon fiber composite material environmental test device according to claim 1, characterized in that A gripper (11) for gripping a test piece or a test piece placement rack for handling is provided at the end of the robotic arm (9).

9. The carbon fiber composite material environmental test device according to claim 8, characterized in that Guide rails are provided on the outer sides of the high-temperature environmental chamber (2-1) and the low-temperature environmental chamber (2-2), and the robotic arm (9) is movably mounted on the guide rails.

10. The carbon fiber composite material environmental test device according to any one of claims 1 to 9, characterized in that, A xenon lamp (21) is provided at the inner top of the high-temperature environmental chamber (2-1).

Images