Visualization device and method for vibration process evolution of bubbles in resin

Abstract

The invention discloses a visualization device and method for vibration process evolution of bubbles in resin. The visualization device comprises a vibration system, a pneumatic control system, a vacuum generation device, a high-speed camera and a light supplementing device. The vibration system comprises a resin container, a vibration motor, a vibration platen and a graduated scale, threaded guide columns are arranged around the resin container, and the graduated scale is arranged on one side of the resin container; the pneumatic control system comprises a micro air compressor, an air channel pipeline and a flow control valve, and the micro air compressor is connected with the resin container; the vacuum generating device comprises a vacuum pump and a vacuum pipeline; the high-speed camera and the light supplementing device are arranged on the two sides of the resin container. According to the visualization device disclosed by the invention, vibration is introduced and a visualization monitoring means is provided, so that the behavior of the bubbles in the resin can be efficiently and accurately researched, the technical blank of research on the evolution behavior of the bubbles in the existing resin-based composite material is filled, and a powerful experimental tool is provided for research in related fields.

Description

Technical Field

[0001] The invention relates to the technical field of resin-based composite material curing and molding, and in particular to a device and method for visualizing the evolution of bubble vibration process in resin. Background Art

[0002] Carbon fiber reinforced polymer (CFRP) has been widely used in aerospace, automobile, wind turbine blades, sports equipment and other fields due to its excellent properties such as light weight, high strength and high rigidity. However, during the curing process of composite materials, pores, as a common defect that has a significant impact on material properties, have become one of the important factors affecting the quality of composite materials. The generation of pores usually originates from the failure of the resin to completely fill the fiber gaps during the resin impregnation process due to the failure to completely exclude air or insufficient resin fluidity, thus forming pores. The presence of pores will significantly reduce the strength, stiffness and fatigue life of the composite material. Therefore, the pore problem is one of the key factors in the production of carbon fiber reinforced resin composite materials, which directly affects the mechanical properties, durability and overall application effect of the material. In order to optimize the performance of composite materials, it is necessary to deeply study the pore generation and elimination mechanism in the composite material manufacturing process.

[0003] To solve the above problems, relevant bubble observation research in the industry has developed. For example, in the invention patent application with application number CN201310048560.X, a new type of observation system is proposed, which consists of a model box, a laser, a sheet light source, a camera and a lens, and an image acquisition and processing module. Although the bubble observation system has certain advantages in certain application scenarios, its ability to observe bubble behavior under vibration conditions is still limited, especially in the process of studying the dynamic characteristics of bubbles of a specific diameter and the interaction between adjacent bubbles, it cannot provide an effective solution.

[0004] Therefore, how to accurately observe and analyze bubble behavior under vibration conditions, especially the study of different bubble diameters and their interactions, remains an urgent issue to be solved. Summary of the invention

[0005] The present invention aims to overcome the deficiencies of the prior art and provide a visualization device for the evolution of bubble vibration process in resin, which can observe the movement behavior of bubbles in resin during the vibration process, thereby providing an effective observation means for studying the dynamic changes of pores under vibration.

[0006] To achieve the above-mentioned purpose, the present invention provides a visualization device for the evolution of the vibration process of bubbles in resin, comprising a vibration system, a pneumatic control system, a vacuum generating device, a high-speed camera and a fill light device; the vibration system comprises a resin container, a vibration motor, a vibration table and a scale, the resin container and the vibration motor are arranged on the vibration table, the resin container comprises a cylinder with a top opening and an upper cover for sealing the top opening, a plurality of threaded guide pins are arranged around the outer periphery of the cylinder, the lower ends of the threaded guide pins are connected to the vibration table, the upper ends of the threaded guide pins penetrate the upper cover, the threaded guide pins seal and lock the upper cover to the cylinder through an adjusting nut, and the scale The ruler is arranged on one side of the outside of the resin container; the pneumatic control system includes a micro air compressor, an air pipeline and a flow control valve, the micro air compressor is connected to the gas inlet of the resin container through the air pipeline, and the flow control valve is arranged on the air pipeline; the vacuum generating device includes a vacuum pump and a vacuum pipeline, the vacuum pump is connected to the vacuum port of the resin container through the vacuum pipeline; the high-speed camera and the fill light device are respectively arranged on the front and back sides of the resin container, the high-speed camera is used to record the movement trajectory of the bubbles in the resin container under the action of vibration, and the fill light device is used to improve the molding quality of the bubble movement captured by the high-speed camera.

[0007] Furthermore, a breathable felt blanket is provided on the top of the cylinder to prevent the resin liquid from being drawn into the vacuum generating device.

[0008] Furthermore, a mounting seat for positioning the resin container is provided at the top center of the vibration table, and a slot for installing the scale is provided on the mounting seat; a balance column for fixation is provided at each of the four corners of the bottom of the vibration table; the number of the vibration motors is two, and the two vibration motors are symmetrically arranged on the left and right sides of the resin container.

[0009] Furthermore, the vibration table plate is provided with a plurality of first through holes having the same number as the threaded guide pillars; and the plurality of threaded guide pillars are arranged to penetrate the plurality of first through holes in a one-to-one correspondence.

[0010] Furthermore, the air path pipeline includes a first curved pipe portion, a transition air pipe portion, a second curved pipe portion and a check valve, one end of the first curved pipe portion is connected to the gas inlet, the other end of the first curved pipe portion is connected to one end of the transition air pipe portion through a check valve, the other end of the transition air pipe portion is connected to one end of the second curved pipe portion through a flow control valve, and the other end of the second curved pipe portion is connected to the micro air compressor.

[0011] Furthermore, the gas inlet is arranged at the bottom of the cylinder, the number of the gas inlet is 2-3, the number of the gas pipelines is the same as the number of the gas inlet; the vacuum port is arranged on the upper cover.

[0012] Furthermore, the vibration table is provided with a plurality of second through holes, the number of which is the same as that of the gas pipelines; and the plurality of gas pipelines are arranged to penetrate the plurality of second through holes in a one-to-one correspondence.

[0013] Furthermore, the working pressure of the flow control valve is 0.1-0.3 bar, the working flow rate is 0-3 ml / s, and the gas supply time is 0-5 s / time.

[0014] The present invention also provides a method for observing the evolution of bubble vibration process in resin, using the above-mentioned visualization device for observation, and the observation method comprises the following steps: S1. First, a certain volume of liquid resin is injected into the resin container, then the upper cover of the resin container is covered, and the adjusting nut on the peripheral side is locked; S2, check the sealing of the resin container; after the inspection is qualified, start the micro air compressor, and set the pressure of the flow control valve to 0.1-0.3 bar, the flow rate to 0-3 ml / s, and the air supply time to 0-5 s / time, so as to generate bubbles of a certain diameter and frequency in the resin container; while the bubbles are generated, turn on the high-speed camera and the fill light device, and adjust the shooting angle and focal length of the high-speed camera so that the shooting range of the high-speed camera can completely cover the resin container and the bubbles inside it; the shooting frame rate of the high-speed camera is 1000-2000fps; S3, start the vibration motor, and adjust the speed of the vibration motor to control its frequency range within 30-500 Hz; finally, open 1-2 air pipelines, and the high-speed camera records the movement trajectory of the bubbles under the vibration for subsequent analysis.

[0015] Furthermore, before step S1, the following steps are also included: S0. Use a vacuum pump to evacuate the resin container to achieve a certain vacuum degree and sealing test in the resin container; the vacuum pressure of the resin container is controlled within the range of -1-0 bar.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a visualization device for the evolution of bubble vibration process in resin, which can track the movement and behavior changes of bubbles in resin in real time by introducing vibration and providing visualization monitoring means. It can efficiently and accurately study the behavior of bubbles in resin, especially the effects of different vibration frequencies and vibration source positions on bubble movement, thus filling the technical gap in the study of bubble evolution behavior in existing resin-based composite materials and providing a powerful experimental tool for research in related fields.

[0017] (2) The present invention provides a method for observing the evolution of bubble vibration process in resin, which can observe in real time the dynamic changes of bubbles under vibration and the aggregation behavior of multiple bubbles, thus making up for the technical difficulty that the pore behavior cannot be effectively observed in the traditional curing process due to the limitations of high temperature, high pressure and vacuum environment.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a device for visualizing the evolution of bubble vibration process in resin according to the present invention; Figure 2 is a schematic diagram of the top view of the visualization device in the present invention; Figure 3 It is a structural schematic diagram of the vibration system in the present invention; Figure 4 is a schematic diagram of the internal structure of the resin container in the present invention; Figure 5 It is a structural schematic diagram of the pneumatic control system in the present invention; Among them, 1-resin container; 1.1-cylinder; 1.2-upper cover; 1a-vacuum port; 2-vibration motor; 3-vibration table; 4-scale; 5-threaded guide column; 6-micro air compressor; 7-air pipeline; 7.1-first bend; 7.2-transition air pipe; 7.3-second bend; 7.4-check valve; 8-flow control valve; 9-vacuum pump; 10-vacuum pipeline; 11-high-speed camera; 12-fill light device; 13-breathable felt blanket; 14-mounting seat; 14a-card slot; 15-balance column; 16-adjusting nut. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0021] See also Figure 1 and Figure 2 In an embodiment of the present invention, a visualization device for the evolution of bubble vibration process in resin is provided, including a vibration system, a pneumatic control system, a vacuum generating device, a high-speed camera 11 and a fill light device 12; the specific structure is as follows: Combination Figure 3 As shown, the vibration system in this embodiment includes a resin container 1, a vibration motor 2, a vibration table 3 and a scale 4, and the resin container 1 and the vibration motor 2 are arranged on the vibration table 3. The resin container 1 is made of high-transmittance glass and is hollow inside. The resin container 1 includes a cylinder 1.1 with a top opening and an upper cover 1.2 for sealing the top opening. A gas inlet (not shown in the figure) is provided at the bottom of the cylinder 1.1, and a vacuum port 1a connected to a vacuum generating device and four openings for threaded guide pins 5 to pass through are provided on the upper cover 1.2. Four threaded guide pins 5 are evenly spaced around the outer periphery of the cylinder 1.1, and the lower ends of the four threaded guide pins 5 are connected to the vibration table 3, and the upper ends of the threaded guide pins 5 pass through the openings of the upper cover 1.2, and each threaded guide pin 5 is provided with an adjusting nut 16. By adjusting the position of the adjusting nut 16, the upper cover 1.2 can be sealed and locked with the cylinder 1.1. Combined with Figure 4 As shown, the cylinder 1.1 is a cylindrical cylinder, and a breathable felt blanket 13 is arranged on the top of the cylinder. The breathable felt blanket is only breathable, but the resin liquid cannot pass through it, so as to prevent the resin liquid from being sucked into the vacuum generating device during operation. The scale 4 is vertically arranged on one side of the outside of the cylinder 1.1, and is used to characterize the shape and size of bubbles in image analysis.

[0022] The pneumatic control system includes a micro air compressor 6, an air pipeline 7 and a flow control valve 8. The micro air compressor 6 is connected to the gas inlet of the resin container 1 through the air pipeline 7. The flow control valve 8 is arranged on the air pipeline 7. Figure 5As shown, the gas pipeline 7 includes a first curved pipe portion 7.1 with a certain arc, a transitional air pipe portion 7.2, a second curved pipe portion 7.3 and a check valve 7.4 for preventing the backflow of the resin. One end of the first curved pipe portion 7.1 is connected to the gas inlet of the resin container 1, and the other end of the first curved pipe portion 7.1 is connected to one end of the transitional air pipe portion 7.2 through the check valve 7.4. The other end of the transitional air pipe portion 7.2 is connected to one end of the second curved pipe portion 7.3 through the flow control valve 8, and the other end of the second curved pipe portion 7.3 is connected to the micro air compressor 6. In this structural setting, the micro air compressor 6 can provide a pressure of 0-3 bar and a flow rate of 0-1 L / min; the pipeline of the first curved pipe portion 7.1 delivers gas to the resin container 1; the transitional air pipe portion 7.2 is used to connect the flow control valve 8 and the check valve 7.4; the flow control valve 8 is used to control the flow and pressure of the gas input into the resin container 1.

[0023] In the embodiment of the present invention, the vacuum generating device includes a vacuum pump 9 and a vacuum pipeline 10. The vacuum pump 9 is connected to the vacuum port 1a of the resin container 1 through the vacuum pipeline 10. The vacuum pump 9 can generate a vacuum pressure of -1-0 bar, which is used to evacuate the resin container 1 to achieve a certain vacuum degree and sealing test in the resin container. The high-speed camera 11 and the fill light device 12 are respectively arranged on the front and back sides of the resin container 1. The high-speed camera 11 is used to record the movement trajectory of the bubbles in the resin container 1 under the action of vibration. The fill light device 12 is an LED scattered light system that can generate a uniform light source and is used to improve the molding quality of the high-speed camera 11 capturing the bubble movement.

[0024] In a specific embodiment, in order to enable the resin container 1 to be quickly installed and positioned, a mounting seat 14 is provided at the top center of the vibration table 3, and a slot 14a is provided on the mounting seat 14, and the mounting scale 4 is inserted into the slot 14a. A balance column 15 is provided at each of the four corners at the bottom of the vibration table 3, which is used to fix the vibration table 3 to the work surface; there are two vibration motors 2, and the two vibration motors 2 are symmetrically arranged on the left and right sides of the resin container 1. Four first through holes are provided on the vibration table 3, which are the same number as the threaded guide pillars 5; the four threaded guide pillars 5 are arranged to penetrate the four first through holes in a one-to-one correspondence. Similarly, a plurality of second through holes are provided on the vibration table 3, which are the same number as the air pipelines 7; the plurality of air pipelines 7 are arranged to penetrate the plurality of second through holes in a one-to-one correspondence.

[0025] In a specific implementation, the number of gas inlets is 2-3, which is used to study the interaction of multiple bubbles; the number of gas pipelines 7 is the same as the number of gas inlets, and the number of gas pipelines opened can be determined according to actual conditions.

[0026] In a specific implementation, the working pressure of the flow control valve 8 is 0.1-0.3 bar, the working flow is 0-3 ml / s, and the air supply time is 0-5 s / time; thereby, bubbles of a certain diameter and frequency can be generated in the resin container 1 during the working process.

[0027] The present invention also provides a method for observing the evolution of bubble vibration process in resin, using the above-mentioned visualization device to observe the bubble movement behavior, and the observation method comprises the following steps: 1. Use a vacuum pump 9 to evacuate the resin container 1 to achieve a certain vacuum degree and sealing test in the resin container 1; the vacuum pressure of the resin container 1 is controlled within the range of -1-0 bar.

[0028] 2. First, the experiment was conducted according to the viscosity-temperature curve of the EM817 liquid resin. Since the color of the resin is darker, the movement state of the bubbles is difficult to observe accurately, so the equivalent substitution method was used in this embodiment. That is, a mixed liquid of clean water and hydroxypropyl methylcellulose was used, and the viscosity was matched with the resin liquid under study by adjusting the ratio of the two. To ensure uniform mixing, the liquid mixture was heated to 35-40°C in a constant temperature water bath and kept stirring for 1-3h until a uniform white, transparent, viscous liquid was formed. In this embodiment, specifically: the liquid mixture was heated to 38°C in a constant temperature water bath and kept stirring for 2h until a uniform white, transparent, viscous liquid was formed.

[0029] 3. Inject the mixed liquid from the top opening of the resin container 1, with an injection volume of 250 ml. Then, cover the upper cover 1.2 of the resin container 1, and tighten the adjusting nut 16 on the peripheral side to ensure the sealing of the resin container 4. Check the sealing of the resin container 1.

[0030] 4. After the sealing inspection is qualified, start the micro air compressor 6, and set the pressure of the flow control valve 8 to 0.1 bar, the flow rate to 0.3 ml / s, and the air supply time to 2 seconds / time, so that bubbles of a certain diameter and frequency are generated in the resin container 1. While the bubbles are being generated, turn on the high-speed camera 11 and the fill light device 12, and adjust the shooting angle and focal length of the high-speed camera 11 so that the shooting range of the high-speed camera 11 can completely cover the resin container 1 and the bubbles inside it, and ensure that the bubbles and the scale are clearly visible. The shooting frame rate of the high-speed camera 11 is 1200fps to ensure the continuity of the bubble movement.

[0031] 5. Start the vibration motor 2, and use the vibration frequency test system to adjust the speed of the vibration motor 2 so that its frequency range is controlled at 500 Hz. Finally, open the two gas pipelines 7 in the gas system, and use the high-speed camera 11 to record the movement trajectory of the bubbles under the action of vibration, which is used for subsequent analysis of the movement behavior between two adjacent bubbles under the action of vibration.

[0032] 6. After the experiment, the bubble images taken by the high-speed camera 11 were post-processed using Photoshop software. The basic steps of image processing include enhancing the imaging quality and performing bubble contour fitting, etc., in order to improve the accuracy and reliability of data analysis.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for visualizing the evolution of bubble vibration in resin, characterized in that: The invention comprises a vibration system, a pneumatic control system, a vacuum generating device, a high-speed camera (11) and a fill light device (12); the vibration system comprises a resin container (1), a vibration motor (2), a vibration table (3) and a scale (4); the resin container (1) and the vibration motor (2) are arranged on the vibration table (3); the resin container (1) comprises a cylinder (1.1) with a top opening and an upper cover (1.2) for sealing the top opening; a plurality of threaded guide posts (5) are arranged around the outer periphery of the cylinder (1.1); the lower ends of the threaded guide posts (5) are connected to the vibration table (3); the upper ends of the threaded guide posts (5) are arranged through the upper cover (1.2); the threaded guide posts (5) seal and lock the upper cover (1.2) and the cylinder (1.1) through an adjusting nut (16); the scale (4) is arranged on the resin container (1). 1); the pneumatic control system comprises a micro air compressor (6), an air pipeline (7) and a flow control valve (8); the micro air compressor (6) is connected to the gas inlet of the resin container (1) through the air pipeline (7); the flow control valve (8) is arranged on the air pipeline (7); the vacuum generating device comprises a vacuum pump (9) and a vacuum pipeline (10); the vacuum pump (9) is connected to the vacuum port (1a) of the resin container (1) through the vacuum pipeline (10); the high-speed camera (11) and the fill light device (12) are respectively arranged on the front and rear sides of the resin container (1); the high-speed camera (11) is used to record the movement trajectory of the bubbles in the resin container (1) under the action of vibration, and the fill light device (12) is used to improve the molding quality of the bubble movement captured by the high-speed camera (11).

2. The visualization device according to claim 1, characterized in that The top of the cylinder (1.1) is provided with a breathable felt blanket (13) for preventing the resin liquid from being sucked into the vacuum generating device.

3. The visualization device according to claim 1, characterized in that A mounting seat (14) for positioning the resin container (1) is arranged at the top center of the vibration table (3), and a slot (14a) for mounting the scale (4) is provided on the mounting seat (14); a balancing column (15) for fixing is arranged at each of the four corners of the bottom of the vibration table (3); and the number of the vibration motors (2) is two, and the two vibration motors (2) are symmetrically arranged on the left and right sides of the resin container (1).

4. The visualization device according to claim 3, characterized in that The vibration table (3) is provided with a plurality of first through holes, the same number as the number of the threaded guide pillars (5); and the plurality of threaded guide pillars (5) are arranged to penetrate the plurality of first through holes in a one-to-one correspondence.

5. The visualization device according to claim 1, characterized in that: The gas pipeline (7) comprises a first curved pipe portion (7.1), a transitional air pipe portion (7.2), a second curved pipe portion (7.3) and a check valve (7.4); one end of the first curved pipe portion (7.1) is connected to the gas inlet; the other end of the first curved pipe portion (7.1) is connected to one end of the transitional air pipe portion (7.2) via the check valve (7.4); the other end of the transitional air pipe portion (7.2) is connected to one end of the second curved pipe portion (7.3) via a flow control valve (8); and the other end of the second curved pipe portion (7.3) is connected to the micro air compressor (6).

6. The visualization device according to claim 1, characterized in that The gas inlet is arranged at the bottom of the cylinder (1.1), the number of the gas inlet is 2-3, the number of the gas pipelines (7) is the same as the number of the gas inlet; the vacuum port (1a) is arranged on the upper cover (1.2).

7. The visualization device according to claim 6, characterized in that The vibration table (3) is provided with a plurality of second through holes, the same number as the gas pipelines (7); and the plurality of gas pipelines (7) are arranged to penetrate the plurality of second through holes in a one-to-one correspondence.

8. The visualization device according to claim 1, characterized in that The working pressure of the flow control valve (8) is 0.1-0.3 bar, the working flow rate is 0-3 ml / s, and the air supply time is 0-5 s / time.

9. A method for observing the evolution of bubble vibration in resin, characterized in that: Observation is performed using a visualization device as described in any one of claims 1 to 8, wherein the observation method comprises the following steps: S1. First, a certain volume of liquid resin is injected into the resin container (1), then the upper cover (1.2) of the resin container (1) is covered, and the adjusting nut (16) on the peripheral side is locked; S2, check the sealing of the resin container (1); after the inspection is qualified, start the micro air compressor (6), and set the pressure of the flow control valve (8) to 0.1-0.3 bar, the flow rate to 0-3 ml / s, and the air supply time to 0-5 s / time, so as to generate bubbles of a certain diameter and frequency in the resin container (1); while the bubbles are generated, turn on the high-speed camera (11) and the fill light device (12), and adjust the shooting angle and focal length of the high-speed camera (11) so that the shooting range of the high-speed camera (11) can completely cover the resin container (1) and the bubbles inside it; the shooting frame rate of the high-speed camera (11) is 1000-2000fps; S3, starting the vibration motor (2), and adjusting the rotation speed of the vibration motor (2) so that its frequency range is controlled within 30-500 Hz; finally, opening 1-2 air pipelines (7), and the high-speed camera (11) records the movement trajectory of the bubbles under the action of vibration, so as to facilitate subsequent analysis.

10. The observation method according to claim 9, characterized in that: Before step S1, the following steps are also included: S0. The resin container (1) is evacuated by using a vacuum pump (9) to achieve a certain vacuum degree in the resin container (1) and to perform a sealing test. The vacuum pressure of the resin container (1) is controlled within a range of -1 to 0 bar.

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