High-modulus carbon fiber sizing and drying equipment

Abstract

The utility model provides high-modulus carbon fiber sizing and drying equipment. The high-modulus carbon fiber sizing and drying equipment comprises an air inlet distributor, a yarn guide carrier roller, an infrared heater, an in-furnace pressure detector, an air outlet distributor, an air outlet adjusting valve, an air outlet temperature measuring thermocouple and a waste discharge fan. Carbon fibers are heated through the infrared heater at the top in the furnace, the pressure in the furnace is automatically controlled through the waste discharge fan, low-air-speed drying and energy saving in the furnace are achieved, the air outlet adjusting valve is controlled through the air outlet temperature measuring thermocouple, the uniformity of an air field in the furnace is achieved, and graphite fibers do not need to be bent in the furnace and are rapidly dried in a reciprocating mode.

Description

Technical Field

[0001] The utility model relates to the field of high modulus carbon fiber production equipment, in particular to high modulus carbon fiber sizing and drying equipment. Background Art

[0002] Carbon fiber is known as the "black gold" of the materials world. Mesophase pitch-based carbon fibers possess superior modulus, thermal conductivity, and electrical conductivity compared to PAN-based carbon fibers, and are widely used in aerospace and civilian industries. As applications in automobiles, aircraft, high-speed rail, and other sectors place new demands on lightweight materials, high performance, and reliability, the superior mechanical properties of carbon fiber will play a significant role in these areas. Currently, domestic high-modulus carbon fiber sizing and drying equipment requires high-speed, forced hot air circulation, resulting in high energy consumption. Due to the high wind speed disturbance, the fibers rub against each other during operation, causing frequent lint and breakage. Broken fibers can cause short circuits and damage to the heater, and moisture within the drying furnace is discharged from both ends, causing environmental pollution. Mesophase pitch-based graphite fibers have a high modulus and are prone to breaking when bent, making them unsuitable for repeated drying within the same furnace. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a high modulus carbon fiber sizing and drying device, and the technical solution for solving the technical problems is as follows: the device comprises an air inlet distributor (1), a wire guide roller (2), an infrared heater (3), a furnace pressure detector (4), an air outlet distributor (5), an air outlet regulating valve (6), an air outlet temperature measuring thermocouple (7), and an exhaust fan (8).

[0004] The high-modulus carbon fibers described in this utility model refer to fibers with a modulus of 600 GPa or higher, specifically mesophase pitch-based graphite fibers. These fibers enter the drying furnace from one end and exit from the other, eliminating the need for back-and-forth drying within the furnace. This reduces bending and thus breakage.

[0005] Furthermore, the air inlet distributor and the air outlet distributor are both two-layered, each layer is made of white steel plates with different pore sizes evenly distributed, the bottom layer is made of white steel plates with a pore size of Φ20mm, a center distance of 40mm between holes, and evenly distributed, and the upper layer is made of white steel plates with a pore size of Φ5mm, a center distance of 10mm between holes, and evenly distributed.

[0006] Furthermore, the guide wire rollers are made of graphite and are evenly distributed at the bottom of the furnace. The diameter of the rollers is Φ25mm and the center distance between the rollers is 200mm, in order to reduce the fuzz and broken wires caused by friction.

[0007] Furthermore, the back plate of the infrared heater has holes with the same and evenly distributed hole diameters. The infrared heater heats the mesophase pitch-based graphite fibers and simultaneously heats the air, which moves upward and evenly distributes the exhaust gas, ensuring a uniform gas field in the furnace.

[0008] Furthermore, the exhaust fan is frequency-controlled, and the pressure of the pressure detector in the furnace is set. By controlling the frequency of the exhaust fan, the pressure in the furnace is controlled to be stable, and a certain adjustable power is provided for air intake and exhaust, so that air is introduced in a small amount from the furnace openings at both ends, preventing the moisture in the furnace from being discharged outward in an unorganized manner and polluting the environment.

[0009] Furthermore, the air outlet regulating valve is an electric regulating valve, which sets the temperature of the thermocouples at the air outlets of each temperature zone to be consistent. By controlling the valve opening of the electric regulating valve, the air outlet flow rate of each temperature zone is controlled, thereby adjusting the uniformity of the wind field in each temperature zone in the furnace.

[0010] The utility model has a scientific and reasonable structure. It heats with an infrared heater, automatically controls the pressure in the furnace, and automatically controls the air flow rate, so as to achieve low wind speed, low energy consumption, low lint, and fast single-pass drying of mesophase asphalt-based graphite fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the present utility model.

[0012] Among them, 1. Air inlet distributor; 2. Wire guide roller; 3. Infrared heater; 4. Furnace pressure detector; 5. Air outlet distributor; 6. Air outlet regulating valve; 7. Air outlet temperature measuring thermocouple; 8. Exhaust fan. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0014] A high modulus carbon fiber sizing and drying device, wherein the high modulus carbon fiber refers to a carbon fiber with a modulus of more than 600GPa, especially a mesophase asphalt-based graphite fiber. After the mesophase asphalt-based graphite fiber is sizing in the previous step, it enters from one end of the drying furnace through a drawing machine and is drawn out from the other end of the drying furnace through the drawing machine. It does not dry back and forth in the furnace, which reduces bending and thus reduces breakage. Air passes through the air inlet distributor (1) at a low speed and blows evenly on the heated mesophase asphalt-based graphite fiber, taking away the moisture in the sizing agent. The heated exhaust gas passes through the perforated back plate of the infrared heater (3) and the air outlet distributor, and evenly enters the exhaust pipe. After passing through the air outlet regulating valve (6) and the exhaust fan (8), the exhaust gas is sent to the exhaust gas treatment system.

[0015] In this embodiment, the guide wire rollers (2) are preferably made of graphite and are evenly distributed at the bottom of the furnace. The diameter of the rollers is Φ25 mm and the center distance between the rollers is 200 mm, in order to reduce the friction that causes hair and broken wires.

[0016] In this embodiment, the exhaust fan (8) is preferably frequency-controlled, and the pressure of the furnace pressure detector (4) is set. By controlling the frequency of the exhaust fan (8), the pressure in the furnace is controlled to be stable, and a certain adjustable power is provided for air intake and exhaust.

[0017] In this embodiment, the air outlet regulating valve (6) is preferably an electric valve, and the temperature of the thermocouple (7) at the air outlet of each temperature zone is set to be consistent. By controlling the valve opening of the electric regulating valve, the air outlet flow rate of each temperature zone is controlled, thereby adjusting the uniformity of the wind field in each temperature zone in the furnace.

[0018] In this embodiment, the apertures of the back plate of the infrared heater (3) are uniformly distributed. The infrared heater (3) heats the mesophase pitch-based graphite fibers and heats the air at the same time. The hot air moves upward, and the back plate of the infrared heater (3) evenly distributes the exhaust gas, ensuring a uniform gas field in the furnace. At the same time, the hot exhaust gas flows upward, forming a chimney effect, providing power for the air intake.

[0019] In this embodiment, the air inlet distributor (1) and the air outlet distributor (5) are two layers, each layer is made of white steel plates with different pore sizes evenly distributed, the bottom layer is made of white steel plates with pore sizes of Φ20mm and a center distance of 40mm between holes, and are evenly distributed, and the top layer is made of white steel plates with pore sizes of Φ5mm and a center distance of 10mm between holes, and are evenly distributed.

[0020] The above embodiments do not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A high modulus carbon fiber sizing and drying device, characterized in that: The invention comprises an air inlet distributor (1), a wire guide roller (2), an infrared heater (3), a furnace pressure detector (4), an air outlet distributor (5), an air outlet regulating valve (6), an air outlet temperature measuring thermocouple (7), and an exhaust fan (8). The air inlet distributor (1) is divided into two layers, each layer is made of a white steel plate with circular holes of different apertures evenly distributed. The wire guide roller (2) is made of graphite material, has a roller diameter of Φ25mm, and a center distance between rollers is 200mm. The back plate of the infrared heater (3) has holes with the same and evenly distributed apertures. The air outlet distributor (5) is divided into two layers, each layer is made of a white steel plate with circular holes of different apertures evenly distributed.

2. The high modulus carbon fiber sizing and drying equipment according to claim 1, characterized in that: The air outlet regulating valve (6) is an electric regulating valve.

3. The high modulus carbon fiber sizing and drying equipment according to claim 1, characterized in that: The exhaust fan (8) is frequency-controlled.

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