CN115625910A - Fiber low-pressure impregnation device for wet winding - Google Patents

Abstract

The invention discloses a low-pressure fiber impregnation device for wet winding, relates to an impregnation device, aims to solve the problems of inaccurate impregnation and poor impregnation environment in the impregnation process of fiber winding, and comprises an impregnation mechanism main body, a resin injection mechanism and a resin mixing barrel; the resin injection mechanism is arranged close to one end of the resin mixing barrel and is installed on the resin mixing barrel, and the resin mixing barrel is arranged close to the resin injection mechanism and is communicated with the resin injection mechanism. The invention belongs to the technical field of fiber composite material forming.

Description

A fiber low-pressure dipping device for wet winding

technical field

The invention relates to a dipping device, in particular to a fiber low-pressure dipping device for wet winding, and belongs to the technical field of fiber composite material molding.

Background technique

In the development of modern aerospace, composite materials have improved the performance and reliability of the system while reducing the weight and maintenance requirements of the aircraft. Therefore, composite material technology is considered to be one of the key technologies in the development of modern aerospace. Advanced resin-based composite materials not only have the advantages of light weight, high strength, fatigue resistance, and corrosion resistance, but also integrate design and manufacturing and can be used to form complex components. It has become the fourth largest aerospace structure after aluminum, steel, and titanium. Material.

Regarding the automatic molding technology of resin-based composite materials, there are mainly automatic laying/laying, pultrusion, and fiber winding. Among them, the fiber winding can design the winding law according to the stress condition of the product, and can fully exert the strength of the fiber. Filament winding machines usually consist of a fiber yarn box, a moving trolley glue tank and a tension mechanism, a winding nozzle and a moving main shaft. The fiber yarn box is used to realize the initial supply of continuous fibers and ensure the stability of the initial tension. The moving trolley includes There are two parts: the dipping tank for mixing fibers and resin and the tension control mechanism for improving fiber tension. The winding nozzle is used to realize the unfolding and sending of fiber tow. The fiber bundle is wound on the surface of the mandrel, and the processing of the fiber winding product is initially completed, and then the winding product is realized through curing and demoulding. Therefore, fiber winding products are easy to realize mechanized and automatic production. After the process conditions are determined, the quality of the wound products is stable and accurate. At the same time, the production efficiency of fiber winding is high, and it has a wide range of applications in the aerospace field.

However, the current traditional fiber winding machine has a relatively prominent shortcoming. During the impregnation process of fiber bundles and resin, most of the existing winding machines use open impregnation mechanisms, as shown in Figure 1. The resin content is controlled by mechanical devices. Simple control, it is difficult to accurately infiltrate the resin with the required content of the fiber into the fiber bundle, and the fiber cannot be impregnated accurately. The glue content in the fiber bundle is too high or too low, which will reduce the quality of the filament winding product. At the same time, the current Some dipping mechanisms directly expose the mixed resin to the air, and impurities are easily mixed in during the winding process, which affects the quality of the wound product. In terms of dipping regulation at different speeds, only by adjusting the distance from the scraper to the roller To make adjustments, there is no more intuitive reflection. Therefore, it is of great significance to design a precise dipping mechanism to improve the quality of filament winding products.

Contents of the invention

The purpose of the present invention is to solve the problems of imprecise dipping and poor dipping environment in the fiber winding dipping process, and further provide a fiber low-pressure dipping device for wet winding.

The technical scheme that the present invention adopts in order to solve the above problems is:

A fiber low-pressure impregnation device for wet winding, which includes a main body of a dipping mechanism, a resin injection mechanism and a resin mixing barrel; the resin injection mechanism is set at one end close to the resin mixing barrel and installed on the resin mixing barrel, and the resin mixing barrel Set close to the resin injection mechanism and communicate with the resin injection mechanism.

The beneficial effects of the present invention are:

1. During the impregnation process of fiber winding, this application reduces the contact between resin and air, and reduces the possibility of resin being polluted.

2 In terms of the mixing of fiber bundles and resin, the extrusion of resin is realized through the resin mixing barrel 13, which can directly control and realize the required value of the product, ensure the resin content of fiber bundles after dipping, and realize the content of fiber dipping Precise control.

3 In this application, each fiber bundle is separated, and fiber impregnation is realized in different cavities to ensure the control of the glue content of each fiber bundle.

4. The present invention can be expanded according to the actual requirements of the fiber bundles to ensure the usage requirements under different conditions.

5. The precise dipping mechanism of the present invention mainly includes a dipping mechanism main body 11, a resin injection mechanism 12 and a resin mixing barrel 13. According to the speed of the fiber bundle, the extrusion speed of the resin can be adjusted by changing the resin mixing barrel 13, so that the fiber bundle The impregnation process is completed in the impregnation cavity with the resin to realize the pretreatment before the fiber bundle is wound. In the present invention, the manufactured product is made of light aluminum alloy material to ensure the lightness of the mechanism. In terms of the structural design of the resin injection mechanism, it is necessary to ensure the entry of the resin and prevent the backflow of the resin.

Description of drawings

Figure 1 Traditional open dipping mechanism

Figure 2 is a schematic diagram of the overall structure of the application.

FIG. 3 is a schematic diagram of the connection between the main body 11 of the dipping mechanism and the resin injection mechanism 12 .

FIG. 4 is a cross-sectional view of the dipping mechanism main body 11 and the resin injection mechanism 12 .

FIG. 5 is a schematic diagram of opening the dipping mechanism main body 11 and the resin injection mechanism 12 of the dipping upper platen 2 and the resin injection upper platen 5 .

FIG. 6 is a side view of the main body 11 of the dipping mechanism.

Fig. 7 is an A-A view of Fig. 6 .

FIG. 8 is a circuit connection diagram of the proportional valve 14 .

Detailed ways

Specific embodiment 1: This embodiment is described in conjunction with Fig. 2-Fig. 7, a fiber low-pressure impregnation device for wet winding, which includes a dipping mechanism main body 11, a resin injection mechanism 12 and a resin mixing tank 13; resin injection The mechanism 12 is arranged near one end of the resin mixing barrel 13 and installed on the resin mixing barrel 13 , and the resin mixing barrel 13 is arranged near the resin injection mechanism 12 and communicated with the resin injection mechanism 12 .

Specific embodiment two: this embodiment is described in conjunction with Fig. 2-Fig. Vinyl fluoride tube 9; the top of the dipping cavity 1 is processed with multiple dipping tanks along the length direction of the dipping cavity 1, and each dipping tank is equipped with a polytetrafluoroethylene tube 9, and the dipping upper platen 2 The cover is installed on the cavity 1 under the dipping. Other compositions and connection methods are the same as those in Embodiment 1.

Specific embodiment three: This embodiment is described in conjunction with Fig. 2-Fig. 7. The difference between this embodiment and specific embodiment one is that the top of the dipped lower cavity 1 is processed with an arc-shaped groove along the length direction, and the dipped upper platen 2 The lower end surface of the bottom is processed with arc-shaped protrusions, and the arc-shaped dipping upper pressing plate 2 is arranged in the arc-shaped groove of the dipping lower mold cavity 1. Other compositions and connection methods are the same as those in the second embodiment.

Specific Embodiment 4: This embodiment is described in conjunction with FIGS. 2-7 . The difference between this embodiment and Embodiment 1 is that the resin injection mechanism 12 includes a resin injection lower cavity 4 and a resin injection upper platen 5; the resin injection lower cavity 4 is processed with multiple cavities, and the resin injection upper platen 5 is covered on the resin injection lower cavity 4, and the resin injection lower cavity 4 is fixedly connected with one end of the impregnated lower cavity 1, and the resin is injected into the lower cavity 4 Each channel of each cavity communicates with one end of the dipping tank of a dipping cavity 1 respectively. The cavity on the resin injection lower cavity 4 is used to store resin and play a buffer role. The front end of the resin injection lower cavity 4 is higher than the rear end outlet to facilitate the flow of resin into the dipped lower cavity 1. Other components and connections The method is the same as that in the third embodiment.

Embodiment 5: This embodiment is described with reference to FIGS. 2-7 . The difference between this embodiment and Embodiment 1 is that the cross-section of each cavity on the resin injection lower cavity 4 is a 'V' shape. Other composition and connection modes are the same as those in Embodiment 4.

Specific embodiment six: this embodiment is described in conjunction with Fig. 2-Fig. The number is three. Other compositions and connection methods are the same as those in Embodiment 5.

Embodiment 7: This embodiment is described in conjunction with Fig. 2-Fig. 7. The difference between this embodiment and Embodiment 1 is that the resin injection mechanism 12 also includes a four-way 4, three joints 6 and three rubber hoses 7; each joint One end of 6 communicates with a cavity of a resin injection lower cavity 4, the other end of each joint 6 is respectively connected with one end of a rubber hose 7, and the other end of each rubber hose 7 is respectively communicated with an outlet of the cross 4, An inlet of the four-way 4 is communicated with the resin mixing barrel 13 through an air pipe. The joint 6 is installed on the resin injection lower cavity 4 through threaded connection. The mixed resin is extruded into the resin injection mechanism 12 by the air pressure in the resin mixing barrel 13, and the fiber bundle enters the polytetrafluoroethylene tube 9 between the resin injection lower cavity 4 and the dipping mechanism main body 11 through the resin injection mechanism 12 , complete the impregnation in Teflon tube 9. Other compositions and connection methods are the same as those in Embodiment 6.

Embodiment 8: This embodiment is described with reference to FIGS. 2-7 . The difference between this embodiment and Embodiment 1 is that the outlet end of each dipping tank at the top of the dipping cavity 1 is equipped with a convex stopper. The polytetrafluoroethylene tube 9 is fixed by the convex block of the dipping tank and the fiber bundle after dipping is spread. Other compositions and connection methods are the same as those in Embodiment 7.

Specific embodiment nine: this embodiment is described in conjunction with Fig. 2-Fig. The upper platen 5 is rotatably connected by two hinges 8, and the resin injection lower cavity 4 and the resin injection upper platen 5 are snapped and fixed by two buckles 10, and the dipped lower cavity 1 and the dipped upper platen 2 are passed through two hinges 8 are connected by rotation, and the dipped lower cavity 1 and the dipped upper platen 2 are clamped and fixed by two hasps 10 . Other compositions and connection modes are the same as those in Embodiment 8.

Embodiment 10: This embodiment is described with reference to FIGS. 2-7 . The difference between this embodiment and Embodiment 1 is that the main body 11 of the dipping mechanism and the resin injection mechanism 12 are fixedly connected by bolts. Other compositions and connection methods are the same as those in Embodiment 1.

Embodiment 11: This embodiment is described in conjunction with FIG. 8. The difference between this embodiment and Embodiment 1 is that a proportional valve 14 is installed on the resin mixing barrel 13. The proportional valve 14 controls the pressure of the gas and regulates the extrusion rate of the resin. , in order to achieve the adjustment of the resin extrusion rate under different fiber winding speeds, in terms of the mixing of fiber bundles and resin, the resin extrusion can be realized by adjusting the size of the proportional valve 14, and the required value of the product can be directly controlled and realized to ensure that the fiber The resin content of the fiber after dipping can be controlled precisely to achieve the precise control of the fiber dipping content. The proportional valve 14 is controlled by an external PLC controller, and the value of the proportional valve 14 is adjusted to change the air pressure to control the rate of resin into the resin injection mechanism 12, matching the required rate of fiber winding, and realizing the production of winding products of a certain specification.

working principle

After the fiber bundle comes out from the yarn box, it enters the gap between the resin injection lower cavity 4 and the resin injection upper platen 5. The front end of the resin injection lower cavity 4 is higher than the rear end. During the fiber winding process, the fiber bundle Advance towards the main body of the dipping mechanism 11, carry the resin and inject the resin into the lower cavity 4 into the polytetrafluoroethylene tube 9, so as to facilitate the flow of the resin toward the main body of the dipping mechanism and prevent the resin from flowing back.

In terms of resin extrusion, the proportional valve 14 of the resin mixing tank 13 is controlled by PLC, and the value of the proportional valve 14 is adjusted to change the air pressure to control the rate at which the resin is injected into the lower cavity 4 and the required rate of fiber winding Matching is carried out to realize the production of winding products of certain specifications. The low-pressure impregnation principle is used to design multi-segment curves, and the degree of impregnation increases continuously through the movement of fiber bundles on the multi-segment curves, and the impregnation is completed according to requirements.

In order to reduce the wear of the fiber bundles, the fiber bundles carry the resin into the PTFE tube 9 between the dipped lower cavity 1 and the dipped upper platen 2, and pass through multiple curves, wherein the resin will change with the path Continuously penetrate or squeeze into the fiber bundle to complete the impregnation of the fiber bundle and ensure the content of the fiber bundle.

Since the polytetrafluoroethylene tube 9 will be deformed during the extrusion process, and the two ends will be rounded, in order to ensure that there will be no lateral deviation during the working process, the polytetrafluoroethylene tube 9 is fixed at the same time as shown in Figure 6 In the cross-sectional structure shown in the side view, during the impregnation process, since the fiber bundle is continuously advancing along the track, there is a force in the same direction on the PTFE tube 9. In order to prevent displacement along the direction, the dipping A convex block is installed behind the upper polytetrafluoroethylene tube 9 on the lower cavity 1, and the convex block is used to fix the polytetrafluoroethylene tube 9 while spreading the fiber bundles after dipping to a certain extent. Here, the impregnation lower cavity 1, the impregnation upper platen 2, the resin injection lower cavity 4 and the resin injection upper platen 5 form the shell of the impregnation mechanism to ensure the sealing of the entire impregnation mechanism and reduce the contact with air during the impregnation process. direct contact to reduce the mixing of impurities in the air. In the impregnation of fiber bundles, separate impregnation is adopted, and each bundle of fibers is impregnated separately to ensure the resin content in each bundle of fibers, which is convenient for multi-filament winding and ensures the quality of multi-filament winding products.

Claims (10)

1. The utility model provides a fibre low pressure gumming device for wet process winding which characterized in that: the device comprises a gum dipping mechanism main body (11), a resin injection mechanism (12) and a resin mixing barrel (13); the resin injection mechanism (12) is arranged close to one end of the resin mixing barrel (13) and is installed on the resin mixing barrel (13), and the resin mixing barrel (13) is arranged close to the resin injection mechanism (12) and is communicated with the resin injection mechanism (12).

2. The low-pressure impregnation device for wet-wound fibers according to claim 1, characterized in that: the gum dipping mechanism main body (11) comprises a gum dipping lower cavity (1), a gum dipping upper pressing plate (2) and a plurality of polytetrafluoroethylene tubes (9); the top end of the lower gumming cavity (1) is provided with a plurality of gumming grooves along the length direction of the lower gumming cavity (1), a polytetrafluoroethylene tube (9) is arranged in each gumming groove, and the upper gumming pressing plate (2) is covered on the lower gumming cavity (1).

3. The low-pressure impregnation device for wet-wound fibers according to claim 2, characterized in that: an arc-shaped groove is processed at the top end of the lower gumming cavity (1) along the length direction, an arc-shaped bulge is processed at the lower end face of the upper gumming press plate (2), and the arc-shaped part of the upper gumming press plate (2) is arranged in the arc-shaped groove of the lower gumming cavity (1).

4. The low-pressure impregnation device for wet-wound fibers according to claim 3, characterized in that: the resin injection mechanism (12) comprises a resin injection lower cavity (4) and a resin injection upper pressure plate (5); a plurality of cavities are processed on the resin injection lower cavity (4), the resin injection upper pressing plate (5) is covered on the resin injection lower cavity (4), the resin injection lower cavity (4) is fixedly connected with one end of the gum dipping lower cavity (1), and each cavity of the resin injection lower cavity (4) is respectively communicated with one end of a gum dipping groove of one gum dipping lower cavity (1).

5. The low-pressure impregnation device for wet-wound fibers according to claim 4, characterized in that: the section of each cavity channel on the resin injection lower cavity (4) is V-shaped.

6. The low-pressure impregnation device for wet-wound fibers according to claim 5, characterized in that: the number of the resin injection lower cavity (4) upper cavity channels is three, and the number of the polytetrafluoroethylene tubes (9) is three.

7. The low-pressure impregnation device for wet-wound fibers according to claim 6, characterized in that: the resin injection mechanism (12) also comprises a four-way joint (4), three joints (6) and three rubber pipes (7); one end of each joint (6) is communicated with a cavity channel of the lower cavity (4) for resin injection, the other end of each joint (6) is connected with one end of a rubber tube (7), the other end of each rubber tube (7) is communicated with an outlet of the cross joint (4), and an inlet of the cross joint (4) is communicated with the resin mixing barrel (13) through an air tube.

8. The low-pressure impregnation device for wet-wound fibers according to claim 7, characterized in that: and a convex stop block is arranged at the outlet end of each impregnation tank at the top end of the lower impregnation cavity (1).

9. The low-pressure impregnation device for wet-wound fibers according to claim 8, characterized in that: it also comprises a plurality of hinges (8) and a plurality of hasps (10); the resin injection lower cavity (4) and the resin injection upper pressing plate (5) are rotationally connected through two hinges (8), the resin injection lower cavity (4) and the resin injection upper pressing plate (5) are clamped and fixed through two hasps (10), the impregnation lower cavity (1) and the impregnation upper pressing plate (2) are rotationally connected through the two hinges (8), and the impregnation lower cavity (1) and the impregnation upper pressing plate (2) are clamped and fixed through the two hasps (10).

10. The low-pressure impregnation device for wet-wound fibers according to claim 1, characterized in that: the gum dipping mechanism main body (11) and the resin injection mechanism (12) are fixedly connected through bolts.

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