A device to prevent the spread of fire after a carbon fiber oxidation furnace catches fire.

Abstract

This invention belongs to the technical field of carbon fiber production equipment, specifically a device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire. The device includes a horizontal drive body and a flame-arresting mechanism. The horizontal drive body is equipped with guide rollers for guiding carbon fibers. The flame-arresting mechanism is located on the horizontal drive body and includes a stainless steel water tank installed on the horizontal drive body and surrounding the guide rollers, and a stainless steel plate fixed to the upper part of the stainless steel water tank. This invention provides a simple and low-cost device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire. By instantly inflating an airbag, the water level in the tank is raised, allowing the water to quickly submerge the guide rollers. When the oxidation furnace catches fire, the flames spread along the polyacrylonitrile precursor fibers. When the flames reach the water tank, they are extinguished by the water, preventing all the polyacrylonitrile precursor fibers on the feeding rack from igniting. A continuous supply of fresh water via a water replenishment pipe lowers the water temperature and improves safety.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber production equipment technology, specifically to a device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire. Background Technology

[0002] PAN-based carbon fiber is a fibrous carbon material in which carbon accounts for more than 90% of the total mass. The carbon fiber structure consists of incomplete graphite crystals arranged along the fiber axis, with irregularly packed parallel layers of atoms, exhibiting a disordered layer structure. It possesses the general characteristics of carbon materials, such as high temperature resistance, abrasion resistance, and electrical conductivity. Due to its lightweight, high tensile strength, high elastic modulus, high temperature resistance, and abrasion resistance, carbon fiber is widely used in aerospace, wind power, and automotive industries.

[0003] The main raw material of PAN-based carbon fiber is polyacrylonitrile precursor fiber. Untreated precursor fiber is flammable and easily combustible at room temperature. Therefore, pre-oxidation is a very important intermediate process to enable the precursor fiber to undergo high-temperature carbonization. During the pre-oxidation process, the molecular chain of polyacrylonitrile precursor fiber gradually transforms into a heat-resistant trapezoidal cyclic structure. The pre-oxidation process is an oxidation, dehydrogenation, denitrogenation, and cyclization process. Each process is an exothermic reaction, which can cause heat storage and overheating within the fiber. In mild cases, the monofilaments may burn out due to heat melting, while in severe cases, multiple fibers may become entangled together and cause a fire.

[0004] Currently, if an oxidation furnace catches fire, the fire spreads too quickly and fiercely. Since the raw yarn is a highly flammable material, if the connection between the fire and the raw yarn is not cut off instantly, all the raw yarn on the yarn feeding rack will catch fire, with unimaginable consequences. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows:

[0007] A device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire includes: a horizontal drive body and a flame arresting mechanism; wherein, a guide roller for guiding carbon fibers is installed on the horizontal drive body; the flame arresting mechanism is disposed on the horizontal drive body, and the flame arresting mechanism includes a stainless steel water tank installed on the horizontal drive body and surrounding the side of the guide roller, a stainless steel plate fixed to the upper part of the stainless steel water tank, airbags fixed to the bottom of both sides of the stainless steel water tank, an air source pipe connected to the airbag, an air pump connected to the other end of the air source pipe, a controller installed on the air pump, a stainless steel pipe connected to the stainless steel water tank for injection, a control valve one disposed on the stainless steel pipe, a drain pipe connected to the bottom of the stainless steel water tank, and a control valve two disposed on the water inlet side of the drain pipe.

[0008] In a preferred embodiment, the present invention can be further configured such that: the guide rollers are provided in multiple sets, and the center point of the carbon fiber guide rollers located in the middle of the stainless steel water tank is flush with the upper edge of the stainless steel water tank.

[0009] In a preferred embodiment, the present invention can be further configured such that a gap is left between the bottom of the stainless steel plate and the bottom of the stainless steel water tank, so that the stainless steel plate forms a semi-sealed space in the stainless steel water tank.

[0010] In a preferred embodiment, the invention may be further configured such that the airbag is located at the bottom of the semi-sealed space between the stainless steel water tank and the stainless steel plate.

[0011] In a preferred embodiment, the present invention can be further configured such that: an oxidation furnace is provided on the side of the flame arrestor mechanism, and the control valve and the controller are signal-connected to the control system of the oxidation furnace.

[0012] In a preferred embodiment, the present invention can be further configured such that a liquid level detector is installed on the inner wall of the stainless steel water tank, and the liquid level detector is signal-connected to the control valve.

[0013] In a preferred embodiment, the present invention can be further configured such that: the stainless steel water tank contains pure water with a liquid level lower than the bottom of the guide roller.

[0014] The above-described technical solution of the present invention has the following beneficial technical effects:

[0015] The device invented in this invention for preventing the spread of fire after a carbon fiber oxidation furnace catches fire has a simple structure and low cost. By instantly inflating the airbag, the water level in the tank is raised, allowing the water to quickly submerge the guide rollers. When the oxidation furnace catches fire, the flames spread along the polyacrylonitrile filaments. When the flames reach the water tank, they are extinguished by the water, preventing all the polyacrylonitrile filaments on the feeding rack from igniting. In addition, a water supply pipe continuously adds new water to lower the water temperature and improve safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention.

[0017] Figure label:

[0018] 1. Stainless steel pipe; 2. Control valve one; 3. Stainless steel water tank; 4. Airbag; 5. Stainless steel plate; 6. Air source pipe; 7. Air pump; 8. Controller; 9. Control valve two; 10. Drain pipe; 11. Pure water; 12. Horizontal drive body; 13. Guide roller. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0020] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a device for preventing the spread of fire after a carbon fiber oxidation furnace has caught fire.

[0021] Example 1:

[0022] Combination Figure 1 As shown, the present invention provides a device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire, comprising: a horizontal drive body 12 and a fire-arresting mechanism.

[0023] The horizontal drive body 12 is equipped with a guide roller 13 for guiding carbon fibers. The horizontal drive body 12 is connected to the guide roller 13 for transmission. A drive motor is installed inside the drive body 12. The drive motor has the functions of driving the guide roller 13 to rotate and providing a platform for the flame arresting mechanism. This device is set between the oxidation furnace and the fiber feeding frame to achieve flame arresting.

[0024] Specifically, the guide roller 13 is provided in multiple sets, and the center point of the carbon fiber guide roller located in the middle of the stainless steel water tank 3 is flush with the upper edge of the stainless steel water tank 3. That is, the guide roller 13 in the middle is slightly lower than the two sides, which makes it convenient for the airbag 4 to squeeze the pure water 11 to contact the bottom of the guide roller 13 in the middle, thereby preventing the fire from spreading along the silk thread and achieving the blocking.

[0025] The flame-arresting mechanism is mounted on the horizontal drive body 12. The flame-arresting mechanism includes a stainless steel water tank 3 mounted on the horizontal drive body 12 and surrounding the guide roller 13; a stainless steel plate 5 fixed to the upper part of the stainless steel water tank 3; airbags 4 fixed to the bottom of both sides of the stainless steel water tank 3; an air source pipe 6 connected to the airbags 4; an air pump 7 connected to the other end of the air source pipe 6; a controller 8 mounted on the air pump 7; a stainless steel pipe 1 connected to the stainless steel water tank 3 for injection; a control valve 2 mounted on the stainless steel pipe 1; a drain pipe 10 connected to the bottom of the stainless steel water tank 3; and a control valve 9 mounted on the inlet side of the drain pipe 10. The flame-arresting mechanism... Upon receiving a fire alarm, controller 8 activates air pump 7, instantly filling airbag 4 with gas. This allows a portion of the pre-reserved pure water 11 in stainless steel water tank 3 to quickly submerge the guide roller 13 on the horizontal drive body 12. Control valve 2, upon receiving the alarm, opens, injecting pure water 11 into stainless steel water tank 3 through stainless steel pipe 1. The flames spreading from the oxidation furnace are instantly extinguished when they reach the guide roller 13 because the water has already submerged the roller. The flames cannot spread to the wire feeding frame and ignite the raw wire. This prevents the oxidation furnace from igniting and failing to immediately cut off the direct connection between the fire source and the raw wire, thus preventing the fire from spreading to the raw wire and causing a serious fire.

[0026] Specifically, the other end of the stainless steel pipe 1 is connected to a water storage tank. There is a gap between the bottom of the stainless steel plate 5 and the bottom of the stainless steel water tank 3. The airbag 4 is located at the bottom of the semi-sealed space between the stainless steel water tank 3 and the stainless steel plate 5. The stainless steel plate 5 forms a semi-sealed space in the stainless steel water tank 3. The airbag 4 in the semi-sealed space expands and squeezes the pure water 11 inside to the middle position, so that the pure water 11 overflows the lower part of the guide roller 13, thereby achieving flame arrest, which is quite reasonable.

[0027] Furthermore, the flame arrestor mechanism is equipped with an oxidation furnace, and the control valve 2 and controller 8 are connected to the control system of the oxidation furnace for easy automation control. PLC controllers and other control devices can be used, which are relatively common and simple.

[0028] Example 2:

[0029] Based on Embodiment 1, a liquid level detector is also installed on the inner wall of the stainless steel water tank 3, and the liquid level detector signal is connected to the control valve 2 9. The liquid level detector can cooperate with the control valve 2 9 to open and drain water when the water level reaches a certain height to prevent overflow. At the same time, pure water 11 is reserved in the stainless steel water tank 3 with the liquid level lower than the bottom of the guide roller 13. The reserved pure water 11 can play an emergency blocking effect, and water can be continuously added through the stainless steel pipe 1 for subsequent blocking.

[0030] The working principle and usage process of this invention are as follows: When the oxidation furnace catches fire and the fire spreads outward, the controller 8 receives information from the oxidation furnace control system and starts the air pump 7 to instantly fill the air bag 4 with gas, allowing a portion of the pure water 11 reserved in the stainless steel water tank 3 to quickly submerge the guide roller 13 on the horizontal drive body 12. After receiving the information, the control valve 2 opens and injects the pure water 11 into the stainless steel water tank 3 through the stainless steel pipe 1. When the flames spreading from the oxidation furnace reach the guide roller 13, the flames are instantly extinguished because the water has already submerged the guide roller. The flames cannot spread to the wire feeding frame and ignite the raw wire, thus preventing the fire from spreading. Then, the control valve 2 opens and new water is continuously added through the stainless steel pipe 1 to lower the water temperature. In conjunction with the opening of the control valve 9, the water is discharged through the drain pipe 10 to prevent overflow.

[0031] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is limited by the claims and their equivalents.

Claims

1. A device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire, characterized in that, include: A horizontal drive body (12) is provided with guide rollers (13) for guiding carbon fibers. A flame arresting mechanism is provided on the horizontal drive body (12). The flame arresting mechanism includes a stainless steel water tank (3) installed on the horizontal drive body (12) and surrounding the side of the guide roller (13), a stainless steel plate (5) fixed on the upper part of the stainless steel water tank (3), an air bag (4) fixed on the bottom of both sides of the stainless steel water tank (3), an air source pipe (6) connected to the air bag (4), an air pump (7) connected to the other end of the air source pipe (6), a controller (8) installed on the air pump (7), a stainless steel pipe (1) connected to the stainless steel water tank (3) for injection, a control valve one (2) provided on the stainless steel pipe (1), a drain pipe (10) connected to the bottom of the stainless steel water tank (3), and a control valve two (9) provided on the water inlet side of the drain pipe (10). A gap is left between the bottom of the stainless steel plate (5) and the bottom of the stainless steel water tank (3). The stainless steel plate (5) makes the stainless steel water tank (3) form a semi-sealed space. Pure water (11) with a liquid level lower than the bottom of the guide roller (13) is reserved in the stainless steel water tank (3). After receiving the information, the control valve (2) opens and injects pure water (11) into the stainless steel water tank (3) through the stainless steel pipe (1); New water is continuously added through the stainless steel pipe (1) to lower the water temperature. In conjunction with the opening of control valve 2 (9), the water is discharged through the drain pipe (10) to prevent overflow.

2. The device for preventing the spread of fire after ignition in a carbon fiber oxidation furnace according to claim 1, characterized in that, The guide roller (13) is provided in multiple sets, and the center point of the carbon fiber guide roller located in the middle of the stainless steel water tank (3) is flush with the upper edge of the stainless steel water tank (3).

3. The device for preventing the spread of fire after ignition in a carbon fiber oxidation furnace according to claim 1, characterized in that, The airbag (4) is located at the bottom of the semi-sealed space between the stainless steel water tank (3) and the stainless steel plate (5).

4. The device for preventing the spread of fire after a carbon fiber oxidation furnace catches fire according to claim 1, characterized in that, The flame arrestor is equipped with an oxidation furnace, and the control valve (2) and controller (8) are connected to the control system of the oxidation furnace.

5. The device for preventing the spread of fire after ignition in a carbon fiber oxidation furnace according to claim 1, characterized in that, A liquid level detector is also installed on the inner wall of the stainless steel water tank (3), and the liquid level detector is connected to the control valve (9).

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