Large-tow carbon fiber yarn spreading device

Abstract

The utility model relates to a large-tow carbon fiber yarn spreading device, and belongs to the technical field of yarn spreading devices, the large-tow carbon fiber yarn spreading device comprises an unwinding mechanism, a heating mechanism, an electrostatic induction mechanism, an airflow yarn spreading mechanism and a winding mechanism which are arranged in sequence, the heating mechanism is used for heating a carbon fiber tow, and the electrostatic induction mechanism is used for enabling the carbon fiber tow to carry charges. The electrostatic induction mechanism is used for pre-spreading yarn, then the airflow yarn spreading mechanism is used for secondary yarn spreading, the surface appearance of broadened fiber bundles is uniform, the yarn spreading effect is ideal, and compared with traditional mechanical yarn spreading, reduction of abrasion to the carbon fiber bundles is facilitated, and the possibility of fuzzing, yarn breaking and yarn mess is reduced.

Description

Technical Field

[0001] The present application relates to the field of yarn spreading devices, and in particular to a large-tow carbon fiber yarn spreading device. Background Art

[0002] With the key technological breakthroughs in large-tow carbon fiber in my country, the application of carbon fiber will become more and more popular, and the application of industrial composite materials will also usher in a blowout development. Among them, continuous carbon fiber reinforced thermoplastic composites have been widely used in the industrial field due to their excellent performance.

[0003] However, in the process of preparing continuous carbon fiber reinforced thermoplastic unidirectional prepreg (UD), it is difficult to fuse the carbon fiber and thermoplastic resin using a melt infusion mold. The main manifestation is that it is difficult for the resin to impregnate the carbon fiber. The thickness and quality of the manufactured composite material are difficult to meet the product structure design requirements, which affects the widespread application of this material. Moreover, as the carbon fiber tow becomes larger, the carbon fiber tends to aggregate more easily, and the yarn spreading effect becomes worse. Therefore, the carbon fiber tow yarn spreading device has become a research focus.

[0004] Most existing yarn unwinding devices use a mechanical method, employing vertical and horizontal vibrations of the unwinding roller. This method is prone to fuzzing during the unwinding process, leading to yarn tangles and breakage, which impacts production efficiency and product quality. Alternatively, an airflow-induced unwinding method is used, which is effective and less likely to damage the yarn bundle. However, this device is complex and requires very high tension control before and after unwinding. This also places high demands on the control accuracy of the equipment, significantly increasing the manufacturing cost of the device. Utility Model Content

[0005] In order to reduce tow damage and improve the yarn spreading effect, the present application provides a large-tow carbon fiber yarn spreading device.

[0006] The present application provides a large-tow carbon fiber yarn spreading device, which adopts the following technical solution:

[0007] A large-tow carbon fiber yarn spreading device comprises an unwinding mechanism, a heating mechanism, an electrostatic induction mechanism, an airflow yarn spreading mechanism and a winding mechanism arranged in sequence. The heating mechanism is used to heat the carbon fiber tow. The electrostatic induction mechanism comprises an induction roller, an insulating cover and a discharge electrode. The insulating cover is arranged on one side of the induction roller. An induction gap for the carbon fiber tow to pass through is provided between the insulating cover and the induction roller. The discharge electrode is arranged on the side of the insulating cover close to the induction gap.

[0008] Optionally, a shielding cover is provided on the side of the insulating cover facing away from the discharge electrode.

[0009] Optionally, the insulating cover is arranged in a circular arc shape, and the discharge electrode is provided in a plurality of numbers, and the plurality of discharge electrodes are uniformly arranged on one side of the insulating cover close to the induction gap.

[0010] Optionally, the airflow spreading mechanism comprises a yarn spreader arranged on one side of the carbon fiber tows, the yarn spreader is a cavity structure with an opening at the top, the yarn spreader is provided with a negative pressure channel, one end of the negative pressure channel is arranged towards the top opening of the yarn spreader, and the other end is communicated with a negative pressure source.

[0011] Optionally, the negative pressure channel is provided with a negative pressure cover at the end towards the top opening of the yarn spreader, the large end of the negative pressure cover is arranged towards the top opening of the yarn spreader, and the small end is communicated with the negative pressure channel.

[0012] Optionally, the negative pressure source is a negative pressure fan.

[0013] Optionally, the heating mechanism is a heating roller.

[0014] In summary, the present application has the following at least one beneficial technical effect:

[0015] 1. The present application utilizes the good electrical conductivity of carbon fiber tows, and makes the carbon fiber tows carry electric charges by arranging an electrostatic induction mechanism. Since the surface of the carbon fiber tows carries the same kind of electric charges, the same kind of electric charges repel each other, so that the carbon fiber tows can be fully spread during the yarn spreading process. Subsequently, an airflow spreading mechanism is added to further spread the carbon fiber tows, and the yarn spreading effect can be significantly improved.

[0016] 2. The present application utilizes the electrostatic induction mechanism for pre-spreading, and then utilizes the airflow spreading mechanism for secondary spreading, so that the yarn spreading effect is ideal, and compared with the traditional mechanical spreading, the damage to the carbon fiber tows is reduced, and the possibility of hairiness, broken yarns and messy yarns is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of a large tow carbon fiber yarn spreading device according to an embodiment of the present application.

[0018] Figure 2 is a schematic diagram of the structure of the electrostatic induction mechanism according to an embodiment of the present application.

[0019] Figure 3 is a schematic diagram of the structure of the airflow spreading mechanism according to an embodiment of the present application.

[0020] Explanation of reference signs: 1, unwinding mechanism; 11, unwinding roller; 12, tension roller; 2, heating mechanism; 3, electrostatic induction mechanism; 31, induction roller; 311, induction gap; 32, insulating cover; 33, discharge electrode; 34, shielding cover; 4, airflow yarn spreading mechanism; 41, yarn spreader; 42, negative pressure channel; 43, negative pressure source; 44, negative pressure cover; 5, winding mechanism. DETAILED DESCRIPTION

[0021] The application will be further described below in conjunction with the accompanying drawings. Figures 1-3 The application will be further described below in conjunction with the accompanying drawings. EMBODIMENT

[0022] The embodiment of the application discloses a large-tow carbon fiber yarn spreading device. Figure 1 The large-tow carbon fiber yarn spreading device comprises, in sequence, an unwinding mechanism 1, a heating mechanism 2, an electrostatic induction mechanism 3, an airflow yarn spreading mechanism 4 and a winding mechanism 5.

[0023] The unwinding mechanism 1 comprises an unwinding roller 11 and a plurality of tension rollers 12, and is used for unwinding and tension control of the carbon fiber tow. Figure 1 The winding mechanism 5 is a winding roller, and is used for winding the carbon fiber tow after spreading.

[0024] The heating mechanism 2 is a heating roller, and is used for heating the carbon fiber tow. Figures 1-2 The electrostatic induction mechanism 3 is used for charging the carbon fiber tow, and comprises an induction roller 31, an insulating cover 32 and a discharge electrode 33.

[0025] The insulating cover 32 is arranged on one side of the induction roller 31, and the induction gap 311 for passing the carbon fiber tow is arranged between the insulating cover 32 and the induction roller 31. Figure 2 In order to uniformly charge the carbon fiber tow and improve the uniformity of spreading, the insulating cover 32 is arranged in a circular arc shape, and the discharge electrode 33 is provided with a plurality of discharge electrodes 33 arranged on one side of the insulating cover 32 close to the induction gap 311.

[0026] In order to shield interference signals and protect the discharge electrode 33, the shielding cover 34 is fixedly connected to the side of the insulating cover 32 away from the discharge electrode 33. Figure 1 andFigure 3 The air flow spreading mechanism 4 comprises a spreading device 41 arranged on one side of the carbon fiber tows, the spreading device 41 is a cavity structure with an opening at one end, the spreading device 41 is provided with a negative pressure channel 42, one end of the negative pressure channel 42 is arranged towards the opening of the spreading device 41, and the other end is communicated with a negative pressure source 43, the negative pressure source 43 is a negative pressure fan. The negative pressure channel 42 is fixedly communicated with a negative pressure cover 44 at the end towards the opening of the spreading device 41, the large end of the negative pressure cover 44 is arranged towards the opening of the spreading device 41, and the small end is communicated with the negative pressure channel 42.

[0027] Due to the action of the negative pressure fan, a certain negative pressure area is generated at the large end of the negative pressure cover 44, when the carbon fiber tows pass through the opening of the spreading device 41, they will be bent under the action of atmospheric pressure, the airflow passes through the gaps between the tows, so that the binding force between the tows is weakened, and when the airflow uniformly passes through the gaps between the tows, the filaments are gradually spread, the tows are uniformly dispersed, the filaments are arranged in parallel along the width direction and are uniformly distributed, and the spreading effect is ensured.

[0028] The working principle of the large tow carbon fiber spreading device according to the embodiment of the application is as follows: the carbon fiber tows have good electrical conductivity, the carbon fiber tows are charged by the electrostatic induction mechanism 3, the carbon fiber tows are fully spread due to the repulsion between the same charges on the surface of the carbon fiber tows during the spreading process. The air flow spreading mechanism 4 is additionally arranged, the carbon fiber tows are further spread, and the spreading effect is significantly improved.

[0029] The electrostatic induction mechanism 3 is used for pre-spreading, and the air flow spreading mechanism 4 is used for secondary spreading, the spreading effect is improved, and compared with the traditional mechanical spreading, the damage to the carbon fiber tows is reduced, and the possibility of fuzzing, breaking and disordering is reduced.

[0030] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A large-tow carbon fiber spreading device characterized by comprising: The device comprises unwinding mechanism (1), heating mechanism (2), electrostatic induction mechanism (3), airflow spreading mechanism (4) and winding mechanism (5) arranged in sequence, the heating mechanism (2) is used for heating carbon fiber tows, the electrostatic induction mechanism (3) comprises induction roller (31), insulating cover (32) and discharge electrode (33), the insulating cover (32) is arranged on one side of the induction roller (31), the insulating cover (32) and the induction roller (31) are provided with induction gap (311) for the carbon fiber tows, the discharge electrode (33) is arranged on one side of the insulating cover (32) close to the induction gap (311).

2. A large tow carbon fiber spreader device according to claim 1, characterized in that: The side of the insulating cover (32) away from the discharge electrode (33) is provided with a shielding cover (34).

3. A large tow carbon fiber spreader device according to claim 1, characterized in that: The insulating cover (32) is arranged in a circular arc shape, and the discharge electrode (33) is provided with a plurality of discharge electrodes (33) arranged uniformly on one side of the insulating cover (32) close to the induction gap (311).

4. A large tow carbon fiber spreader device according to claim 1, characterized in that: The airflow spreading mechanism (4) comprises a yarn spreader (41) arranged on one side of the carbon fiber tows, the yarn spreader (41) is a cavity structure with an opening at one end, a negative pressure channel (42) is arranged in the yarn spreader (41), one end of the negative pressure channel (42) is arranged towards the opening of the yarn spreader (41), and the other end is communicated with a negative pressure source (43).

5. A large tow carbon fiber unwinder as defined in claim 4, characterized in that: The negative pressure channel (42) is provided with a negative pressure cover (44) at one end of the opening of the yarn spreader (41), the large end of the negative pressure cover (44) is arranged towards the opening of the yarn spreader (41), and the small end is communicated with the negative pressure channel (42).

6. A large tow carbon fiber unwinder as defined in claim 4, characterized by: The negative pressure source (43) is a negative pressure fan.

7. A large tow carbon fiber spreader device according to claim 1, characterized by: The heating mechanism (2) is a heating roller.

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