Hot air circulation pre-oxidation equipment based on carbon fiber precursor

Abstract

The present invention belongs to the technical field of carbon fiber precursor pre-oxidation, and specifically relates to hot air circulation pre-oxidation equipment based on carbon fiber precursor, which comprises a pre-oxidizer, a hot air circulation mechanism and a plurality of sleeves, wherein the pre-oxidizer comprises an oxidation chamber and an air inlet pipe, and the hot air circulation mechanism comprises a circulation pipe; the two ends of the circulation pipe are respectively connected to the air inlet pipe and the right side of the oxidation chamber, the air inlet pipe is connected to the top of the oxidation chamber, a circulation pump and a high-temperature heater are arranged inside the circulation pipe, the interior of the oxidation chamber is hollow, and a blowing pipe is connected to the shaft above the inner wall, the blowing pipe is connected to the air inlet pipe hose, and a guide rail is fixedly installed on the bottom of the inner wall of the oxidation chamber. The device solves the problem that the current carbon fiber precursor cannot automatically control the drawing length of the precursor during the pre-oxidation process, and the precursor is blown evenly, resulting in low pre-oxidation efficiency and poor pre-oxidation quality of the carbon fiber precursor.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon fiber precursor preoxidation, and in particular relates to hot air circulation preoxidation equipment based on carbon fiber precursor. Background Art

[0002] The oxidation process of carbon fiber precursor mainly occurs in the pre-oxidation stage, which is a key step in the production of carbon fiber. During the pre-oxidation process, the carbon fiber precursor (usually polyacrylonitrile (PAN)-based precursor) undergoes a series of chemical changes, including cyclization, oxidation and dehydrogenation reactions. These reactions convert the linear molecular chain of the precursor into a heat-resistant ladder structure. This structural change not only lays the foundation for the subsequent carbonization process, but also improves the stability of the precursor. During the pre-oxidation process, the color of the precursor gradually changes, starting from pure white, passing through light yellow, beige, light brown, and finally turning black. The temperature of the pre-oxidation process is generally between 200°C and 300°C, especially at about 240°C, the oxygen content rises rapidly, and a rapid chemical reaction occurs. In this process, a certain drafting force needs to be applied to ensure that the structure of the wire does not de-orientate, thereby maintaining the strength of the pre-oxidized wire. In the prior art, it is impossible to intelligently control the drafting length and drafting force of the precursor, and the blowing is uneven or the hot air continues to blow the precursor, resulting in damage to the internal structure of the carbon fiber precursor, or even breakage. This phenomenon has become a problem that needs to be solved by people in this field. Summary of the invention

[0003] The object of the present invention is to provide a hot air circulation pre-oxidation device based on carbon fiber precursor to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a hot air circulation pre-oxidation device based on carbon fiber precursor, comprising a pre-oxidation machine, a hot air circulation mechanism and a plurality of sleeves, the pre-oxidation machine comprising an oxidation chamber and an air inlet pipe, the hot air circulation mechanism comprising a circulation pipe; the two ends of the circulation pipe are respectively connected to the air inlet pipe and the right side of the oxidation chamber, the air inlet pipe is connected to the top of the oxidation chamber, a circulation pump and a high-temperature heater are arranged inside the circulation pipe, the interior of the oxidation chamber is hollow, and a blowing pipe is connected to the axis above the inner wall, the blowing pipe is connected to the air inlet pipe hose, a guide rail is fixedly installed at the bottom of the inner wall of the oxidation chamber, a slider is slidably connected above the guide rail, a telescopic rod is fixedly installed above the slider, a sleeve pipe 1 is installed on the upper end bearing of the telescopic rod, a sleeve pipe 2 is installed on the inner wall bearing of the oxidation chamber, and the sleeve pipe 2 is located on the left side of the sleeve pipe 1 and is horizontally aligned.

[0005] The present invention further illustrates that a toothed plate is fixedly mounted on one side of the slider, a motor is fixedly mounted on the inner wall of the oxidation chamber, a gear is fixedly connected to the output end of the motor, and the gear and the toothed plate are meshed with each other.

[0006] The present invention further illustrates that a pneumatic chamber is fixedly installed on the right side of the inner wall of the oxidation chamber, and a reciprocating cylinder is fixedly installed on the right side of the inner wall of the pneumatic chamber; a pneumatic plate is slidably connected to the inner wall of the pneumatic chamber, and the pneumatic plate is fixedly connected to the output end of the reciprocating cylinder, and a connecting rod is connected between the pneumatic plate and the right side of the blowing pipe.

[0007] The present invention further describes that a sliding hole is provided on the left side of the air pressure chamber, and a limiting block is slidably connected in the sliding hole, a tooth plate is fixedly connected to the left end of the limiting block, and a plurality of tooth blocks are provided below the tooth plate, and the tooth plate is meshed with the top of the gear.

[0008] The present invention further illustrates that the left side of the air pressure chamber is connected to an external pipeline, and a one-way valve is arranged in the pipeline; the left side of the air pressure chamber is connected to a telescopic rod pipeline, and an air cavity is arranged in the pipeline, and a pressure valve is arranged on the left side of the air cavity; the telescopic rod is connected to an external control valve pipeline.

[0009] The present invention further illustrates that a processor is provided inside the pre-oxidizer, and an intelligent operating system is provided inside the processor, the intelligent operating system includes a precursor model module, a data processing module, and an intelligent control module, the data processing module is electrically connected to the precursor model module and the intelligent control module respectively, and the intelligent control module is electrically connected to the motor; the precursor model module is used for the operator to manually select the corresponding carbon fiber precursor model according to the carbon fiber precursor placed, and judge the thickness of the carbon fiber precursor by the model, the data processing module is used for data processing, and calculates the rotation angle of the motor according to the thickness of the carbon fiber precursor, and the intelligent control module is used to control the rotation of the motor and the rotation angle according to the data calculated by the data processing module.

[0010] The present invention further illustrates that the operation steps of the intelligent operating system include: step S1, the intelligent operating system is running, the operator puts the carbon fiber precursor into the oxidation chamber, and then manually selects the corresponding carbon fiber precursor model through the precursor model module, and judges the thickness of the carbon fiber precursor by the model; step S2, the data processing module and the intelligent control module respectively calculate and control the rotation angle of the motor to make the motor rotate; step S3, the rotation angle of the motor changes, so that the rotation angle of the gear changes, and the length of the carbon fiber precursor stretched, the swing amplitude of the blowing pipe and the telescopic frequency of the telescopic rod change synchronously; step S4, after the pre-oxidation is completed, the intelligent operating system stops running.

[0011] The present invention further illustrates that in the steps S1 to S3, the length of the carbon fiber precursor being stretched, the swing amplitude of the blowing tube, and the extension and retraction frequency of the telescopic rod vary according to the thickness of the carbon fiber precursor.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention performs hot air circulation through a circulation pipeline, has high pre-oxidation efficiency, and simultaneously stretches the carbon fiber precursor, which can not only ensure the strength of the carbon fiber precursor, but also enable the precursor to be blown more comprehensively by the blowing pipe, and the pre-oxidation efficiency is greatly improved. During the pre-oxidation process, the reciprocating cylinder performs reciprocating motion, thereby driving the air pressure plate to slide left and right along the inner wall of the air pressure chamber, and the air pressure plate drives the blowing pipe to swing left and right through the axis through the connecting rod, and when the blowing pipe swings left and right, the surface of the carbon fiber precursor can be blown more comprehensively, further enhancing the pre-oxidation efficiency and quality;

[0013] The moving distance of the limit block controls the reciprocating movement stroke of the air pressure plate, thereby controlling the frequency of extension and contraction of the telescopic rod. That is, the longer the precursor is stretched, the higher the frequency of extension and contraction of the telescopic rod. When the telescopic rod is extended, the precursor is further stretched relatively slightly after being stretched. Therefore, by increasing the extension and contraction frequency of the telescopic rod, the precursor will not be further stretched for a long time, thereby preventing the carbon fiber precursor from being broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the internal structure of the oxidation chamber of the present invention;

[0017] Figure 3 It is a schematic plan view of the oxidation chamber of the present invention;

[0018] Figure 4 It is a schematic diagram of the meshing relationship between the tooth plate and the gear of the present invention;

[0019] Figure 5 It is a schematic diagram of the connection relationship between the air pressure plate and the blowing pipe and the meshing relationship between the tooth plate and the gear of the present invention;

[0020] Figure 6 It is a schematic diagram of the pipeline connection relationship between the air pressure chamber and the telescopic rod of the present invention;

[0021] Figure 7 It is a schematic diagram of the module connection relationship of the intelligent operating system of the present invention;

[0022] In the figure: 1. oxidation chamber; 101. blowing pipe; 102. guide rail; 103. slider; 104. telescopic rod; 105. sleeve pipe 1; 106. sleeve pipe 2; 107. tooth plate; 2. air inlet pipe; 3. circulation pipe; 31. circulation pump; 32. high temperature heater; 4. motor; 41. gear; 5. air pressure chamber; 51. reciprocating cylinder; 52. air pressure plate; 53. connecting rod; 54. limit block; 541. tooth plate; 55. air chamber; 56. pressure valve. DETAILED DESCRIPTION

[0023] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-7 The present invention provides a technical solution: a hot air circulation preoxidation device based on carbon fiber precursor, comprising a preoxidation machine, a hot air circulation mechanism and a plurality of sleeves, the preoxidation machine comprising an oxidation chamber 1 and an air inlet pipe 2, the hot air circulation mechanism comprising a circulation pipe 3;

[0025] The two ends of the circulation pipeline 3 are respectively connected to the air inlet pipe 2 and the right side of the oxidation chamber 1, the air inlet pipe 2 is connected to the top of the oxidation chamber 1, and a circulation pump 31 and a high-temperature heater 32 are arranged inside the circulation pipeline 3. The interior of the oxidation chamber 1 is hollow, and a blowing pipe 101 is connected to the axis above the inner wall, and the blowing pipe 101 is connected to the air inlet pipe 2 hose. A guide rail 102 is fixedly installed at the bottom of the inner wall of the oxidation chamber 1, and a slider 103 is slidably connected above the guide rail 102. A telescopic rod 104 is fixedly installed above the slider 103, and a sleeve pipe 105 is installed on the upper end bearing of the telescopic rod 104. A sleeve pipe 105 is installed on the inner wall bearing of the oxidation chamber 1, and a sleeve pipe 2 106 is installed, and the sleeve pipe 2 106 is located on the left side of the sleeve pipe 105 and is horizontally aligned;

[0026] The carbon fiber precursor is wound on two sleeves, and the two sleeves are respectively inserted into the sleeve tube 2 106 and the sleeve tube 1 105, and then the circulation pump 31 and the high-temperature heater 32 are operated simultaneously, and the hot air enters the air inlet pipe 2 through the circulation pipe 3, and then enters the blowing pipe 101 through the hose, and then is sprayed from the blowing pipe 101 to the carbon fiber precursor. The oxygen content in the oxidation chamber 1 rises rapidly, and a rapid chemical reaction occurs. In this process, the precursor is converted into a pre-oxidized yarn with a heat-resistant trapezoidal structure, so that in the subsequent carbonization process, the pre-oxidized yarn can maintain the fiber morphology in a high-temperature environment under the protection of an inert gas, and finally converted into a carbon fiber with a turbostratic graphite structure. During the pre-oxidation process, the circulation pump 31 extracts the high-temperature gas in the oxidation chamber 1, thereby performing hot air circulation through the circulation pipe 3, and the pre-oxidation efficiency is high.

[0027] A toothed plate 107 is fixedly mounted on one side of the slider 103, a motor 4 is fixedly mounted on the inner wall of the oxidation chamber 1, a gear 41 is fixedly connected to the output end of the motor 4, and the gear 41 is meshed with the toothed plate 107;

[0028] During the pre-oxidation process, a certain stretching force needs to be applied to the carbon fiber precursor to ensure that the structure of the fiber is not deoriented, thereby maintaining the strength of the pre-oxidized fiber. At this time, the motor 4 runs, driving the gear 41 to rotate, and the gear 41 drives the tooth plate 107 to move to the right through meshing, and the tooth plate 107 drives the slider 103 to slide to the right along the guide rail 102. The slider 103 drives the sleeve tube 105 to move to the right through the telescopic rod 104, thereby stretching the carbon fiber precursor, which can not only ensure the strength of the carbon fiber precursor, but also enable the precursor to be blown more comprehensively by the blowing pipe 101, and the pre-oxidation efficiency is greatly improved.

[0029] A pressure chamber 5 is fixedly installed on the right side of the inner wall of the oxidation chamber 1, and a reciprocating cylinder 51 is fixedly installed on the right side of the inner wall of the pressure chamber 5;

[0030] The inner wall of the air pressure chamber 5 is slidably connected with an air pressure plate 52, the air pressure plate 52 is fixedly connected to the output end of the reciprocating cylinder 51, and a connecting rod 53 is connected between the air pressure plate 52 and the right side of the blowing pipe 101;

[0031] During the pre-oxidation process, the reciprocating cylinder 51 performs reciprocating motion, thereby driving the air pressure plate 52 to slide left and right along the inner wall of the air pressure chamber 5. The air pressure plate 52 drives the blowing pipe 101 to swing left and right through the axis through the connecting rod 53. When the blowing pipe 101 swings left and right, the surface of the carbon fiber precursor can be blown more comprehensively, further enhancing the pre-oxidation efficiency and quality.

[0032] A sliding hole is provided on the left side of the air pressure chamber 5, and a limit block 54 is slidably connected in the sliding hole. A tooth piece 541 is fixedly connected to the left end of the limit block 54, and a plurality of tooth blocks are provided below the tooth piece 541. The tooth piece 541 meshes with the upper part of the gear 41.

[0033] When the reciprocating cylinder 51 reciprocates, the limit block 54 limits the air pressure plate 52, thereby controlling the left and right swing amplitude of the blowing tube 101. While the carbon fiber precursor is being stretched, the gear 41 drives the limit block 54 to move to the left by engaging with the tooth plate 541. At this time, the longer the carbon fiber precursor is stretched, the greater the distance the limit block 54 moves to the left, thereby making the left and right swing amplitude of the blowing tube 101 larger. The two are in a proportional relationship, thereby ensuring that the stretching length is proportional to the swing amplitude of the blowing tube 101, and enabling the blowing tube 101 to blow the surface of the carbon fiber precursor evenly from left to right in real time, thereby further improving the pre-oxidation quality.

[0034] The left side of the air pressure chamber 5 is connected to the external pipeline, and a one-way valve is arranged in the pipeline. The left side of the air pressure chamber 5 is connected to the telescopic rod 104 pipeline, and an air cavity 55 is arranged in the pipeline. A pressure valve 56 is arranged on the left side of the air cavity 55.

[0035] The telescopic rod 104 is connected to the external control valve pipeline;

[0036] Through the above steps, the reciprocating cylinder 51 drives the air pressure plate 52 to slide left and right along the inner wall of the air pressure chamber 5 when reciprocating. The left side of the air pressure plate 52 extracts gas from the outside through the pipeline and injects it into the air chamber 55, and repeats the operation until the air pressure in the air chamber 55 reaches the pressure bearing limit of the pressure valve 56. The pressure valve 56 opens, and the gas quickly enters the telescopic rod 104 through the pipeline to stretch it, thereby driving the sleeve tube 105 to move upward, shortening the distance between the blowing pipe 101 and the carbon fiber precursor, thereby strengthening the blowing intensity on the surface of the carbon fiber precursor, which can further accelerate the pre-oxidation efficiency. In order to prevent the carbon fiber precursor from being subjected to continuous high-temperature blowing, after the telescopic rod 104 is stretched, the external control valve is opened, and the air pressure inside the telescopic rod 104 returns to normal. At the same time, it is affected by the weight of the sleeve tube 105 and shrinks and resets, so that the telescopic rod 104 performs intermittent extension and contraction movements, preventing the carbon fiber precursor from being subjected to continuous high temperature and damaging the structure, thereby protecting the carbon fiber precursor.

[0037] The moving distance of the limit block 54 controls the reciprocating movement stroke of the air pressure plate 52, thereby controlling the frequency of extension and contraction of the telescopic rod 104. That is, the longer the precursor is stretched, the higher the frequency of extension and contraction of the telescopic rod 104. When the telescopic rod 104 is stretched, the precursor is further stretched relatively slightly after being stretched. Therefore, by increasing the extension and contraction frequency of the telescopic rod 104, the precursor will not be further stretched for a long time, thereby preventing the carbon fiber precursor from being broken.

[0038] A processor is provided inside the pre-oxidizer, and an intelligent operating system is provided inside the processor, the intelligent operating system includes a raw silk model module, a data processing module, and an intelligent control module, the data processing module is electrically connected to the raw silk model module and the intelligent control module respectively, and the intelligent control module is electrically connected to the motor 4;

[0039] The precursor model module is used for the operator to manually select the corresponding carbon fiber precursor model according to the inserted carbon fiber precursor, and judge the thickness of the carbon fiber precursor by the model. The data processing module is used for data processing, and calculates the rotation angle of the motor 4 according to the thickness of the carbon fiber precursor. The intelligent control module is used to control the rotation and rotation angle of the motor 4 according to the data calculated by the data processing module.

[0040] The operation steps of the intelligent operating system include:

[0041] Step S1, the intelligent operating system is running, the operator puts the carbon fiber precursor into the oxidation chamber 1, and then manually selects the corresponding carbon fiber precursor model through the precursor model module, and determines the thickness of the carbon fiber precursor by the model;

[0042] Step S2: the data processing module and the intelligent control module respectively calculate and control the rotation angle of the motor 4 to make the motor 4 rotate;

[0043] Step S3, the rotation angle of the motor 4 changes, so that the rotation angle of the gear 41 changes, and the length of the carbon fiber precursor being drawn, the swing amplitude of the blowing tube 101 and the extension frequency of the telescopic rod 104 change synchronously;

[0044] Step S4: After the pre-oxidation is completed, the intelligent operating system stops running.

[0045] In step S1 to step S3, the length of the carbon fiber precursor being drawn, the swing amplitude of the blowing tube 101, and the extension frequency of the telescopic rod 104 are changed according to the thickness of the carbon fiber precursor;

[0046] On the one hand, it ensures sufficient pre-oxidation effect, and on the other hand, it protects the carbon fiber precursor from continuous high temperature and excessive stretching that may cause structural damage or even breakage, thereby fully protecting the carbon fiber precursor.

[0047] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0048] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hot air circulation preoxidation device based on carbon fiber precursor, comprising a preoxidation machine, a hot air circulation mechanism and a plurality of sleeves, characterized in that: The pre-oxidizer comprises an oxidation chamber (1) and an air inlet pipe (2), and the hot air circulation mechanism comprises a circulation pipeline (3); The two ends of the circulation pipeline (3) are respectively connected to the air inlet pipe (2) and the right side of the oxidation chamber (1); the air inlet pipe (2) is connected to the top of the oxidation chamber (1); a circulation pump (31) and a high-temperature heater (32) are arranged inside the circulation pipeline (3); the inside of the oxidation chamber (1) is hollow, and a blow pipe (101) is axially connected to the top of the inner wall; the blow pipe (101) is connected to the air inlet pipe (2) hose; a guide rail (102) is fixedly installed at the bottom of the inner wall of the oxidation chamber (1); a slider (103) is slidably connected to the top of the guide rail (102); a telescopic rod (104) is fixedly installed above the slider (103); the telescopic rod (104) is fixedly installed above the slider (103); The upper end bearing of the retracting rod (104) is installed with a sleeve tube 1 (105), the inner wall bearing of the oxidation chamber (1) is installed with a sleeve tube 2 (106), and the sleeve tube 2 (106) is located on the left side of the sleeve tube 1 (105) and is horizontally aligned, a tooth plate (107) is fixedly installed on one side of the slider (103), a motor (4) is fixedly installed on the inner wall of the oxidation chamber (1), a gear (41) is fixedly connected to the output end of the motor (4), and the gear (41) and the tooth plate (107) are meshed with each other, a pneumatic chamber (5) is fixedly installed on the right side of the inner wall of the oxidation chamber (1), and a reciprocating cylinder (51) is fixedly installed on the right side of the inner wall of the pneumatic chamber (5); The inner wall of the air pressure chamber (5) is slidably connected to a pressure plate (52), the pressure plate (52) is fixedly connected to the output end of the reciprocating cylinder (51), a connecting rod (53) is connected between the pressure plate (52) and the right side of the blowing pipe (101), a sliding hole is provided on the left side of the air pressure chamber (5), and a limit block (54) is slidably connected in the sliding hole, a tooth piece (541) is fixedly connected to the left end of the limit block (54), and a plurality of tooth blocks are provided below the tooth piece (541), the tooth piece (541) and the upper part of the gear (41) are meshed with each other, the left side of the air pressure chamber 5 is connected to an external pipeline, and a one-way valve is provided in the pipeline, the left side of the air pressure chamber (5) is connected to the telescopic rod (104) pipeline, and an air cavity (55) is provided in the pipeline, and a pressure valve (56) is provided on the left side of the air cavity (55); The telescopic rod (104) is connected to an external control valve pipeline.

2. The hot air circulation pre-oxidation equipment based on carbon fiber precursor according to claim 1 is characterized in that: The pre-oxidizer is provided with a processor inside, and the processor is provided with an intelligent operating system inside, the intelligent operating system comprises a raw silk model module, a data processing module, and an intelligent control module, the data processing module is electrically connected to the raw silk model module and the intelligent control module respectively, and the intelligent control module is electrically connected to the motor (4); The precursor model module is used for an operator to manually select a corresponding carbon fiber precursor model according to the inserted carbon fiber precursor, and to judge the thickness of the carbon fiber precursor by the model; the data processing module is used for data processing, and to calculate the rotation angle of the motor (4) according to the thickness of the carbon fiber precursor; and the intelligent control module is used for controlling the rotation and rotation angle of the motor (4) according to the data calculated by the data processing module.

3. The hot air circulation pre-oxidation equipment based on carbon fiber precursor according to claim 2 is characterized in that: The operation steps of the intelligent operating system include: Step S1, the intelligent operating system is running, and the operator puts the carbon fiber precursor into the oxidation chamber (1), and then manually selects the corresponding carbon fiber precursor model through the precursor model module, and determines the thickness of the carbon fiber precursor according to the model; Step S2: the data processing module and the intelligent control module respectively calculate and control the rotation angle of the motor (4) to make the motor (4) rotate; Step S3, the rotation angle of the motor (4) changes, thereby changing the rotation angle of the gear (41), and the length of the carbon fiber precursor being drawn, the swing amplitude of the blowing tube (101), and the extension and retraction frequency of the telescopic rod (104) change synchronously; Step S4: After the pre-oxidation is completed, the intelligent operating system stops running.

4. The hot air circulation pre-oxidation equipment based on carbon fiber precursor according to claim 3 is characterized in that: In the steps S1 to S3, the length of the carbon fiber precursor stretched, the swing amplitude of the blowing pipe (101), and the extension and retraction frequency of the telescopic rod (104) are varied according to the thickness of the carbon fiber precursor.

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