Observable thermosetting resin vacuum tank auxiliary resin transfer system

Abstract

The utility model relates to the technical field of aerospace thermal protection and force bearing part manufacturing, in particular to an observable thermosetting resin vacuum tank auxiliary resin transfer system. The problems that in the resin injection process, the injection process and the resin infiltration degree of a prefabricated body cannot be directly observed, so that the resin injection process is uncontrollable, incomplete resin infiltration is likely to occur, a poor resin area appears in a product, and the product quality is affected are solved. According to the technical scheme adopted by the utility model, the device comprises an air compressor, a glue storage tank, a vacuum tank and a vacuum pump, wherein a mold is arranged in the vacuum tank; the air compressor is connected with a glue storage tank air inlet valve of the glue storage tank through an air pipe, a glue storage tank air outlet valve of the glue storage tank is connected with the vacuum pump through an air pipe, a glue outlet valve of the glue storage tank is connected with a vacuum tank glue injection port valve of the vacuum tank through a glue pipe, and a mold glue injection port valve of the mold is connected with the vacuum tank glue injection port valve through a glue pipe. The die is a combined die with a sealed lower end and an open upper end.

Description

TECHNICAL FIELD

[0001] The utility model relates to aerospace heat protection and force component manufacturing technical field, concretely relates to an observable thermosetting resin vacuum tank auxiliary resin transfer system. BACKGROUND

[0002] Vacuum Assisted Resin Transfer Molding (VARTM) is a kind of composite material manufacturing process combined with traditional resin transfer molding (RTM) and vacuum assisted principle.

[0003] It is especially suitable for the extremely high requirement of material in the field of aerospace, needs to have high strength, light weight, high temperature resistance, corrosion resistance and other characteristics, and also has strict requirement to the precision and reliability of manufacturing process. Although the traditional autoclave forming process can meet the manufacturing requirement of high-performance composite material, there are problems such as high equipment cost, low production efficiency and size limitation. As a kind of low-cost, high-efficiency and suitable for large-scale complex structure process, VARTM forming process has long-term development space in the field of aerospace.

[0004] VARTM process utilizes vacuum negative pressure to drive resin to infiltrate dry fiber reinforced material, and finally solidifies and forms. Its core is to pull resin into the mold in the vacuum tank through vacuum pressure difference, so as to realize uniform resin injection and sufficient fiber infiltration. The overall structure of the previous vacuum tank is made of metal material, and the internal injection condition cannot be observed during use, so that the key resin transfer process in VARTM process cannot be directly observed. If pipeline blockage or pipeline damage occurs, the problem cannot be found at the first time, and problems such as pipeline blockage, excessive resin injection or insufficient resin injection during glue injection are easy to occur, which seriously affects product manufacturing cost and product quality. And the traditional resin transfer mold is designed as a closed mold, and the vacuum pump is connected through the mold glue outlet to apply negative pressure, so that a vacuum cavity is formed in the mold cavity, and resin is pulled into the mold cavity to realize resin transfer, but the closed mold structure cannot observe whether the resin in the mold cavity is completely filled.

[0005] In the production process of VARTM process, if the viscosity of resin is too large, only relying on the vacuum pressure to pull the resin, the pulling force provided by the vacuum is often not enough, which leads to slow resin injection speed and increases the manufacturing cost. In severe cases, the resin begins to cure before the injection is completed, which directly leads to product scrap. UTILITY MODEL CONTENTS

[0006] Therefore, the utility model discloses to solve the problem that the resin injection process is uncontrollable, resin impregnation is incomplete, and resin-poor areas appear in products, affecting product quality, in the resin injection process, the resin injection process and the resin impregnation degree of the prefabricated body cannot be directly observed, provide a kind of observable thermosetting resin vacuum tank auxiliary resin delivery system.

[0007] To realize the above-mentioned purpose, the utility model discloses the technical scheme that a kind of observable thermosetting resin vacuum tank auxiliary resin delivery system, including air compressor, glue storage tank, vacuum tank and vacuum pump, vacuum tank is provided with mould;The air compressor is connected with the glue storage tank inlet valve of glue storage tank by air pipe, the glue storage tank outlet valve of glue storage tank is connected with vacuum pump by air pipe, the glue outlet valve of glue storage tank is connected with the vacuum tank glue injection port valve of vacuum tank by rubber tube, the mould glue injection port valve of mould is connected with vacuum tank glue injection port valve by rubber tube, the mould is the lower end sealed upper end open type combined mould.

[0008] Further, the vacuum tank glue injection port valve is arranged on the upper cover of the vacuum tank, and the upper cover is further provided with a vacuum tank negative pressure gauge, a vacuum tank observation window, a vacuum tank exhaust port valve and a vacuum tank outlet valve.

[0009] Further, the upper part of the glue storage tank is further provided with a glue storage tank negative pressure gauge, a glue storage tank positive pressure gauge and a glue storage tank exhaust port valve.

[0010] Further, the top of the mould is provided with a glue storage groove.

[0011] Further, the glue storage tank is further provided with an observation window.

[0012] Further, the two sides of the vacuum tank are further provided with reinforcing ribs, and the reinforcing ribs are provided with lifting lugs.

[0013] Further, the mould glue injection port valve is provided with two.

[0014] Further, the air pipe is a transparent air pipe.

[0015] Further, the rubber tube is a transparent rubber tube.

[0016] Compared with the prior art, the utility model has the following effects:

[0017] 1. The utility model discloses that the observable vacuum tank, the observable resin delivery mould and the observable glue storage tank are designed, and the internal conditions are observed conveniently.

[0018] 2. Compared with the traditional vacuum tank, the upper cover of the vacuum tank is designed as an integral detachable structure, heavy-duty mould hoisting and transportation are facilitated, and glue injection holes, exhaust holes, pressure gauges and three observation windows are provided.

[0019] 3. The mold in the utility model can be observed in real time, is designed as an open-top mold, and the open-top mold cannot realize a vacuum cavity simply by relying on the mold structure, must be placed in a vacuum tank, and provides pulling force for resin by using the vacuum cavity of the vacuum tank, and whether the mold is full of resin is judged by observing the glue discharging condition in the glue storage groove of the mold in the vacuum tank through the observation window of the vacuum tank.

[0020] 4. When working, compressed air is injected into the glue storage tank, a pushing force is provided for the resin, so that the resin has not only the pulling force provided by the vacuum tank, but also the pushing force of the compressed air, and the resin injection speed can be significantly improved by one pulling and one pushing. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the utility model.

[0022] Figure 2 It is a sectional view of the mold.

[0023] Mark description: 1: air compressor, 2: glue storage tank, 3: vacuum tank, 4: mold, 5: vacuum pump, 6: air pipe, 7: rubber pipe.

[0024] 2-1: glue storage tank negative pressure gauge, 2-2: glue storage tank positive pressure gauge, 2-3: glue storage tank exhaust valve, 2-4: glue storage tank air outlet valve, 2-5: glue storage tank air inlet valve; 2-6: glue storage tank observation window; 2-7: glue outlet valve of glue storage tank;

[0025] 3-1: upper cover, 3-2: vacuum tank negative pressure gauge, 3-3: observation window, 3-4: vacuum tank exhaust valve, 3-5: vacuum tank glue inlet valve, 3-6: vacuum tank air outlet valve, 3-7: base, 3-8: handle, 3-9: reinforcing rib, 3-10: lifting lug, 3-11: flange;

[0026] 4-1: mold glue inlet valve, 4-2: glue storage groove. DETAILED DESCRIPTION

[0027] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood by specific circumstances.

[0028] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of the utility model protection.

[0029] The embodiment provides a kind of observable thermosetting resin vacuum tank auxiliary resin transfer system, as shown in Figure 1 It includes air compressor 1, glue storage tank 2, vacuum tank 3, mould 4 and vacuum pump 5;Mould 4 is arranged in vacuum tank 3;Air compressor 1 is connected with the glue storage tank inlet valve 2-5 of glue storage tank 2 by air pipe 6, the glue storage tank outlet valve 2-4 of glue storage tank 2 is connected with vacuum pump 5 by air pipe 6, the glue outlet valve 2-7 of glue storage tank 2 is connected with the vacuum tank glue injection port valve 3-5 of vacuum tank 3 by rubber tube 7, the bottom of mould 4 is provided with mould glue injection port valve 4-1 on both sides, mould glue injection port valve 4-1 is connected with vacuum tank glue injection port valve 3-5 by rubber tube 7, and glue is injected into mould.

[0030] As an embodiment in the embodiment, the upper portion of glue storage tank 2 is provided with upper cover, glue storage tank negative pressure gauge 2-1, glue storage tank positive pressure gauge 2-2, glue storage tank exhaust port valve 2-3 and glue storage tank inlet valve 2-5 are arranged on upper cover, and glue storage tank observation window 2-6 is arranged on the side of glue storage tank 2, to facilitate observing the glue storage condition.

[0031] As an embodiment in the embodiment, the upper portion of vacuum tank 3 is provided with upper cover 3-1, and vacuum tank glue injection port valve 3-5 is arranged on the upper cover 3-1 of vacuum tank 3, and vacuum tank negative pressure gauge 3-2, vacuum tank observation window 3-3, vacuum tank exhaust port valve 3-4 and vacuum tank outlet valve 3-6 are further arranged on upper cover 3-1, and vacuum tank outlet valve 3-6 is further connected with air pipe 6 between vacuum pump 5 and glue storage tank 2.

[0032] Three reinforcing ribs 3-9 are arranged on the circumference of the body of vacuum tank 3, to increase the strength of the tank body, and lifting lugs 3-10 are arranged on reinforcing ribs 3-9, to facilitate hoisting, and handles 3-8 are further arranged on both sides of upper cover 3-1. Two bases 3-7 are arranged on the bottom of vacuum tank 3, to facilitate forklift loading and transportation, and flange 3-11 is arranged on the tank opening of vacuum tank, to increase the pressure receiving area of the tank opening and tank cover, and improve the sealing performance.

[0033] As an embodiment in the embodiment, mould 4 is a combined mould with sealed lower end and open upper end, and glue storage groove 4-2 is arranged on the top, and the glue storage condition of glue storage groove 4-2 can be observed through vacuum tank observation window 3-3. Figure 2 As shown in

[0034] As an embodiment in the present embodiment, the air pipe 6 and the rubber pipe 7 are both transparent pipes.

[0035] As an embodiment in the present embodiment, the vacuum tank 3 has a height of about 1500 mm, a diameter of about 1300 mm, and a wall thickness of 15 mm, which can basically meet the use space of most small and medium-sized molds; the vacuum tank 3 is made of Q235 steel material, which has good comprehensive mechanical properties and good machining properties, and can improve the service life of the vacuum tank; the upper cover of the vacuum tank is made of 6061 aluminum alloy material, which has good comprehensive mechanical properties and good machining properties, and has a relatively low density, which facilitates disassembly and assembly.

[0036] The upper cover of the vacuum tank is provided with an air outlet hole and an air outlet valve for connecting a vacuum pump to provide negative pressure for the vacuum tank.

[0037] The upper cover of the vacuum tank is provided with an air inlet hole and an air inlet hole valve for air inlet and release of the negative pressure in the vacuum tank.

[0038] The upper cover of the vacuum tank is provided with a negative pressure gauge and a negative pressure gauge valve for observing the negative pressure value in the tank.

[0039] The upper cover of the vacuum tank is provided with three observation windows for observing the situation in the tank.

[0040] Four handles 3-8 are arranged around the upper cover of the vacuum tank for facilitating opening of the cover; the handles are designed in the shape of handles, which can be manually opened, and can also be lifted by a crane.

[0041] A sealing groove is arranged around the upper cover of the vacuum tank for installing a sealing ring to realize sealing of the cover opening.

[0042] The mold is composed of an inner mold and four outer molds to form a mold cavity; after the mold is combined, an open type glue storage tank is formed at the upper end, and after the resin fills the mold, it will flow into the glue storage tank, so that the resin flow-out state can be directly observed to determine the resin injection condition in the mold.

[0043] The glue storage tank is used for storing resin and is mainly composed of a tank body and a tank cover; the tank body is made of Q235 steel material, which has good comprehensive mechanical properties and good machining properties, and can improve the service life of the vacuum tank; the tank cover is made of 6061 aluminum alloy material, which has good comprehensive mechanical properties and good machining properties, and has a relatively low density, which facilitates disassembly and assembly.

[0044] The tank cover is a whole detachable structure, which facilitates filling of resin and cleaning after production; six threaded holes are arranged around the tank cover for fixing the tank cover; a sealing groove is arranged around the lower surface of the tank cover, and a sealing ring is installed in the groove for sealing; the tank cover is provided with a positive pressure gauge and a negative pressure gauge for observing the pressure in the tank.

[0045] The tank cover of the glue storage tank is provided with an air inlet and an air inlet valve, which is used for connecting the air compressor and providing positive pressure in the tank when injecting resin.

[0046] The tank cover of the glue storage tank is provided with an air outlet and an air outlet valve, which is used for connecting the air compressor and providing negative pressure in the tank when defoaming the resin.

[0047] The tank body of the glue storage tank is provided with a glue outlet and a glue outlet valve, which is used for connecting the glue pipe.

[0048] The tank body of the glue storage tank is provided with an observation window, which is used for observing the resin in the tank.

[0049] The vacuum pump is used for providing negative pressure for the vacuum tank and the glue storage tank.

[0050] The air compressor is used for providing positive pressure for the glue storage tank.

[0051] The operation process of the utility model is as follows:

[0052] During operation, first, the mold is placed into the vacuum tank, the glue inlet of the mold is connected to the glue inlet below the tank cover of the vacuum tank through a transparent glue pipe, and then the upper cover of the hot-pressing tank is closed.

[0053] The air outlet valve above the tank cover of the vacuum tank and the air outlet valve above the tank cover of the glue storage tank are connected in parallel with the vacuum pump through a transparent air pipe.

[0054] The glue inlet valve above the tank cover of the vacuum tank is connected with the glue storage tank through a transparent glue pipe (the transparent glue pipe is made of PU material, can more intuitively observe the flow state of the resin in the pipe, has certain strength and can withstand 0.8Mpa atmospheric pressure to meet the use requirement).

[0055] The air inlet valve of the glue storage tank is connected with the compressed air source through an air pipe.

[0056] The resin is loaded into the glue storage tank, the tank cover of the glue storage tank is locked, the vacuum pump and the air outlet valve of the glue storage tank are opened, the resin is defoamed, and the air outlet valve is closed after the defoaming is completed.

[0057] The air inlet valve is opened, the compressed air is punched into the glue storage tank, the resin is subjected to thrust through the compressed air, the resin is injected into the mold through the cooperation of positive and negative pressure, and the preform is impregnated. The problem of slow injection speed when injecting high-viscosity resin can be solved.

[0058] The vacuum pump is opened, negative pressure is applied to the vacuum tank, and the resin is provided with pulling force.

[0059] Opening the valve on the glue injection pipeline can inject resin into the mold, the resin injection condition can be observed through the observation port of the vacuum tank, when the preform is completely impregnated, the resin will overflow into the glue storage groove at the upper end of the mold, and the resin impregnation degree can be judged through the overflow amount and overflow form of the resin. The problem that the resin injection process in the vacuum tank cannot be observed can be solved.

[0060] Many specific details are set forth in the foregoing description in order to provide a thorough understanding of the application. However, the application can be practiced according to other embodiments that do not require the specific details described above. Therefore, the scope of the present application is not limited to the specific embodiments described above.

[0061] The preferred embodiments of the present application have been described above with the specific details. However, the present application can be implemented in other ways different from the description herein, and therefore, the protection scope of the present application is not limited to the specific embodiments disclosed above.

Claims

1. An observable thermosetting resin vacuum tank-assisted resin transfer system, characterized in that, The system includes an air compressor (1), a glue storage tank (2), a vacuum tank (3), and a vacuum pump (5). A mold (4) is installed inside the vacuum tank (3). The air compressor (1) is connected to the glue storage tank inlet valve (2-5) of the glue storage tank (2) via an air pipe (6). The glue storage tank outlet valve (2-4) of the glue storage tank (2) is connected to the vacuum pump (5) via an air pipe (6). The glue outlet valve (2-7) of the glue storage tank (2) is connected to the vacuum tank glue injection port valve (3-5) of the vacuum tank (3) via a glue pipe (7). The mold injection port valve (4-1) of the mold (4) is connected to the vacuum tank glue injection port valve (3-5) via a glue pipe (7). The mold (4) is a combined mold with a sealed bottom and an open top.

2. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 1, characterized in that, The vacuum tank filling port valve (3-5) is located on the upper cover (3-1) of the vacuum tank (3). The upper cover (3-1) is also equipped with a vacuum tank negative pressure gauge (3-2), a vacuum tank observation window (3-3), a vacuum tank exhaust port valve (3-4), and a vacuum tank air outlet valve (3-6). The vacuum tank air outlet valve (3-6) is also connected to the air pipe (6) between the vacuum pump (5) and the glue storage tank (2).

3. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 1 or 2, characterized in that, The upper part of the glue storage tank (2) is also equipped with a glue storage tank negative pressure gauge (2-1), a glue storage tank positive pressure gauge (2-2), and a glue storage tank exhaust valve (2-3).

4. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 3, characterized in that, The top of the mold (4) is provided with a glue storage tank (4-2).

5. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 4, characterized in that, The storage tank (2) is also equipped with an observation window (2-6).

6. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 5, characterized in that, The vacuum tank (3) is also provided with reinforcing ribs (3-9) on both sides, and lifting lugs (3-10) are provided on the reinforcing ribs (3-9). The top cover (3-1) is also provided with handles (3-8) on both sides.

7. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 6, characterized in that, The mold injection port valve (4-1) is provided with two valves.

8. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 7, characterized in that, The trachea (6) is a transparent trachea.

9. The observable thermosetting resin vacuum tank-assisted resin transfer system according to claim 8, characterized in that, The tubing (7) is a transparent tubing.

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