A pre-oxidation furnace orifice plate of a carbon fiber production line that can be adjusted on demand and an adjustment method thereof

Abstract

The present invention relates to the technical field of oxidation furnaces, and in particular to an orifice plate of a pre-oxidation furnace of a carbon fiber production line that can be adjusted as needed and an adjustment method thereof, comprising an installation frame, and a first air permeable layer arranged in the installation frame at an air outlet side and a second air permeable layer arranged at an air inlet side; a plurality of first long strips are arranged on the first air permeable layer, and a plurality of second long strips are arranged on the second air permeable layer, and the plurality of first long strips and the plurality of second long strips are arranged crosswise to form throttling holes and blocking surfaces that are distributed at intervals; locking mechanisms are provided at both ends of the first long strips and the second long strips, and the locking mechanisms can be slidably arranged in guide grooves of frames around the installation frame; guide plates are provided on the first long strips, which are inclined along the air flow direction to control the flow rate, flow direction and distribution of the air flow, and the locking mechanism changes the gap between the long strips, thereby adjusting the size of the throttling holes to match the air flow speed requirements required for different raw fibers, thereby improving the flexibility and adaptability of the production line.

Description

Technical Field

[0001] The invention relates to the technical field of oxidation furnaces, and in particular to an orifice plate of a pre-oxidation furnace of a carbon fiber production line which can be adjusted as needed and an adjustment method thereof. Background Art

[0002] The pre-oxidation furnace is an important equipment for the carbon fiber production line. The uniformity and stability of the wind field and temperature field inside it determine the quality difference of the same batch of carbon fibers. In order to improve the uniformity of the flow field in the pre-oxidation furnace, high design requirements are imposed on the central distributor and the end return air chamber of the pre-oxidation furnace. Among them, the orifice plate is an important device for adjusting the uniformity of the wind speed. The function of the orifice plate is to use the throttling method to make the airflow turn when it flows through the throttling surface / hole, and flow in the direction and flow rate required by the design.

[0003] In the prior art, the orifice plates of the pre-oxidation furnace of the carbon fiber production line are mostly formed in one piece, and multiple groups of circular holes are generated on a rectangular metal plate by stamping. The orifice plates are arranged evenly or in a certain pattern to achieve the throttling and guiding effects of the airflow.

[0004] However, when using different precursors or producing carbon fibers of different specifications, the temperature and speed of the airflow in the oxidation furnace need to be adjusted, and the fixed-arrangement perforated plate structure cannot fully meet the requirements of the flow field and temperature field after different precursors enter the oxidation furnace. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a pre-oxidation furnace orifice plate of a carbon fiber production line which can be adjusted as needed and an adjustment method thereof, so as to effectively solve the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a perforated plate of a pre-oxidation furnace of a carbon fiber production line which can be adjusted as needed is arranged on the dividing surface of two adjacent chambers in the oxidation furnace, and comprises a mounting frame, and a first air permeable layer arranged in the mounting frame on the air outlet side and a second air permeable layer arranged in the air inlet side;

[0007] A plurality of first long strips are arranged along a first direction on the first air permeable layer, and a plurality of second long strips are arranged along a second direction on the second air permeable layer, and the plurality of first long strips and the plurality of second long strips are arranged crosswise to form throttling holes and blocking surfaces distributed at intervals in the gaps between two adjacent first long strips and two adjacent second long strips;

[0008] Wherein, locking mechanisms are provided at both ends of the first long strip and the second long strip, and a plurality of the locking mechanisms can be slidably arranged in the guide grooves of the frames around the installation frame;

[0009] Guide plates are arranged on the first plurality of long strips of the first air-permeable layer, and the guide plates are arranged obliquely along the airflow direction.

[0010] Furthermore, the first long plate and the second long plate both adopt a metal sheet structure.

[0011] Furthermore, the plurality of the first long strips and the plurality of the second long strips are arranged at equal intervals.

[0012] Furthermore, the plurality of the first long strips are arranged at equal intervals, and the distribution intervals of the plurality of the second long strips gradually increase along the gas guide direction.

[0013] Furthermore, the plurality of the second long strips are arranged at equal intervals, and the distribution intervals of the plurality of the first long strips gradually increase along the gas guide direction.

[0014] Furthermore, a hinge structure is provided at the connection between the first long board and the guide plate, the hinge structure comprises a fixing seat fixed on the first long board and a connecting seat fixed on the guide plate, a hinge shaft is provided on the connecting seat, a locking hole is provided on the fixing seat for the hinge shaft to be embedded, and a locking gap is provided on the fixing seat corresponding to the locking hole;

[0015] The hinge shaft and the fixing seat are both provided with positioning holes for the pin shaft to be inserted.

[0016] Further, the installation frame includes a first frame body for installing the first breathable layer and a second frame body for installing the second breathable layer;

[0017] The two ends of the first strip are fixed to the opposite frames of the first frame through the locking mechanism;

[0018] The two ends of the second strip are fixed to the opposite frames of the second frame through the locking mechanism;

[0019] Wherein, the locking mechanism comprises a fixing bolt and a nut, and the fixing bolt passes through the first strip and the protruding end of the first frame in sequence and is connected to the nut;

[0020] The fixing bolt passes through the second strip and the protruding end of the second frame in sequence and is connected to the nut.

[0021] Furthermore, the first frame and the second frame are both provided with grooves at positions corresponding to the guide grooves;

[0022] One end of the fixing bolt away from the nut is embedded in the groove.

[0023] Furthermore, the outer edge of the first frame body extends an abutment edge toward the second frame body;

[0024] Furthermore, the sum of the depth of the abutting edge and the depth of the groove is greater than the distance between the head of the fixing bolt and the end surface of the second frame body.

[0025] The present invention also provides a method for adjusting the orifice plate of the preoxidation furnace of the carbon fiber production line as described above, which can be adjusted as needed, comprising the following steps:

[0026] According to the process requirements, the corresponding locking mechanism on the first air permeable layer or the second air permeable layer that needs to be adjusted is loosened and unlocked by using an unlocking tool;

[0027] The position of the first long board or the second long board on the corresponding air permeable layer is adjusted by sliding the position of the locking mechanism, and the locking mechanisms moved into position are pre-locked one by one to achieve pre-adjustment of the position of the long board;

[0028] After all pre-adjustments are completed, the levelness of all long boards is calibrated by using a level meter, and the locking mechanisms corresponding to the calibrated long boards are locked in turn.

[0029] The beneficial effects of the present invention are as follows: the present invention can control the flow rate, flow direction and distribution of the airflow through the arrangement of the cross-arranged first long strips, the second long strips and the guide plates, thereby ensuring uniform distribution of the airflow in the pre-oxidation furnace, thereby improving the effect and quality of pre-oxidation, and through the arrangement of the locking mechanism, it can change the gap between the long strips, thereby adjusting the size of the throttling hole, thereby achieving precise control of the airflow flow, so as to match the airflow speed requirements required for different raw fibers, and improve the flexibility and adaptability of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a first isometric view of the orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as needed in an embodiment of the present invention;

[0032] Figure 2 It is a second isometric view of the orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as needed in the embodiment of the present invention;

[0033] Figure 3 It is a cross-sectional view and a partial enlarged view of the orifice plate in the embodiment of the present invention;

[0034] Figure 4It is a schematic diagram of a first frame body and a second frame body in an embodiment of the present invention from a first perspective;

[0035] Figure 5 It is a schematic diagram of a second perspective decomposition of the first frame and the second frame in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the distribution of the first long strips and the second long strips with equal spacing in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the distribution of first long strips with equal spacing and second long strips with unequal spacing in an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the distribution of the first long strips with unequal spacing and the second long strips with equal spacing in an embodiment of the present invention;

[0039] Fig. 9 It is a schematic diagram and a partial enlarged diagram of the installation of the hinge structure in the embodiment of the present invention. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] like Figures 1 to 9The orifice plate of the pre-oxidation furnace of the carbon fiber production line shown in the figure, which can be adjusted as needed, is arranged on the dividing surface of two adjacent chambers in the oxidation furnace, and the orifice plate includes a mounting frame 1, and a first air-permeable layer 2 and a second air-permeable layer 3 arranged in the mounting frame 1 on the air outlet side; a plurality of first long strips 21 are arranged along the first direction on the first air-permeable layer 2, and a plurality of second long strips 31 are arranged along the second direction on the second air-permeable layer 3, and the plurality of first long strips 21 and the plurality of second long strips 31 are arranged in a cross arrangement to form throttling holes 2A and blocking surfaces 2B distributed at intervals in the gaps between the two adjacent first long strips 21 and the two adjacent second long strips 31; wherein, locking mechanisms 4 are provided at both ends of the first long strips 21 and the second long strips 31, and the plurality of locking mechanisms 4 can be slidably arranged in the guide grooves 1A of the frames around the mounting frame 1; and guide plates 22 are provided on the plurality of first long strips 21 of the first air-permeable layer 2, and the guide plates 22 are inclined along the airflow direction.

[0044] The implementation process of the present invention is that when the airflow enters a certain chamber, it will first contact the second air permeable layer 3 of the orifice plate, and further pass through the first air permeable layer 2. The airflow is blocked and guided to a certain extent by the blocking surface 2B, so that the airflow passes through the throttle hole 2A to form a specific flow rate and flow direction, and the airflow passing through the throttle hole 2A will continue to enter the next chamber along the inclined surface of the guide plate 22. The present invention can control the flow rate, flow direction and distribution of the airflow through the cross-arranged first long strip plate 21, the second long strip plate 31 and the guide plate 22, ensure the uniform distribution of the airflow in the pre-oxidation furnace, thereby improving the effect and quality of pre-oxidation, and through the setting of the locking mechanism 4, it can change the gap between the long strip plates, and then adjust the size of the throttle hole 2A, to achieve precise control of the airflow flow, so as to match the airflow speed requirements required by different raw fibers, and improve the flexibility and adaptability of the production line.

[0045] In order to prevent the phenomenon of partial gas reverse flow when the airflow encounters obstacles or changes direction, the first long strip plate 21 and the second long strip plate 31 are both made of metal sheet structure. The metal sheet has good strength and toughness, which enables it to effectively resist the backflow of the airflow when facing the high-temperature and high-speed airflow in the pre-oxidation furnace. When the airflow tries to flow back, the structure of the metal sheet can maintain its shape and position stability, prevent the airflow from unnecessary backflow, and ensure that the airflow can flow in the predetermined direction.

[0046] In a preferred embodiment of the present invention, a plurality of first long strips 21 and a plurality of second long strips 31 are arranged at equal intervals to form throttling holes 2A of uniform size. When the airflow passes through the throttling holes 2A, it will encounter uniform resistance, thereby ensuring that the airflow is more evenly distributed in the pre-oxidation furnace.

[0047] In another embodiment, a plurality of first long strips 21 are arranged at equal intervals, and the distribution spacing of a plurality of second long strips 31 gradually increases along the gas flow direction. In the above distribution form, the spacing between the second long strips 31 is small, and the throttling holes 2A are relatively dense, which makes the airflow encounter greater resistance here and the flow rate is faster. As the airflow moves along the flow direction, the spacing between the second long strips 31 gradually increases, the throttling holes 2A become sparse, the resistance to the airflow gradually decreases, and the flow rate gradually slows down. This gradually changing air intake condition can be precisely adjusted according to the process requirements of different areas in the pre-oxidation furnace. For example, in areas where strong airflow penetration is required, it can be achieved by a smaller spacing between the second long strips 31; and in areas where slower airflow is required, the flow rate can be reduced by increasing the spacing. Similarly, a plurality of second long strips 31 are arranged at equal intervals, and the distribution spacing between the plurality of first long strips 21 gradually increases along the gas flow direction.

[0048] In actual use, facing central distributors or end air sealing boxes in different positions and structures, it is necessary to select guide plates 22 with different inclination angles to adapt to different airflow guiding requirements. Preferably, a hinge structure 23 is provided at the connection between the first long strip 21 and the guide plate 22. The hinge structure 23 includes a fixing seat 231 fixed on the first long strip 21 and a connecting seat 232 fixed on the guide plate 22. A hinge shaft is provided on the connecting seat 232. The fixing seat 231 is provided with a locking hole for the hinge shaft to be embedded. A locking gap 23a is provided at the position of the fixing seat 231 corresponding to the locking hole. During use, the fixing seat 231 is locked and the locking gap 23a is reduced at the same time, so that the diameter of the locking hole becomes smaller to clamp the locking shaft. In order to prevent the guide plate 22 from accidentally moving during use, a positioning hole 23b for the pin shaft to be inserted is provided on the hinge shaft and the fixing seat 231.

[0049] In a preferred embodiment of the present invention, the mounting frame 1 includes a first frame body 11 for mounting the first air permeable layer 2 and a second frame body 12 for mounting the second air permeable layer 3; the two ends of the first strip are fixed to the relative frames of the first frame body 11 through a locking mechanism 4; the two ends of the second strip are fixed to the relative frames of the second frame body 12 through a locking mechanism 4; wherein the locking mechanism 4 includes a fixing bolt 41 and a nut 42, wherein the fixing bolt 41 passes through the protruding ends of the first strip and the first frame body 11 in turn and is connected to the nut 42; the fixing bolt 41 passes through the protruding ends of the second strip and the second frame body 12 in turn and is connected to the nut 42.

[0050] Specifically, the first strip and the second strip are respectively fixed on the relative frames of the first frame 11 and the second frame 12 by the locking mechanism 4, thereby ensuring the stability of the entire installation frame 1. This fixing method is not only simple and effective, but also can resist external vibration and impact, ensuring that the breathable layer is not easy to loosen or shift during long-term use. In addition, bolts and nuts 42 are used as the locking mechanism 4. When the breathable layer needs to be replaced or repaired, only the two frames need to be separated, which is convenient for installation and disassembly, reducing the maintenance difficulty and time cost. Preferably, when selecting a fixing screw, in order to facilitate adjustment, a pin hole is provided at the end of the rod body of the fixing bolt 41. During the adjustment process, the fixing bolt 41 is inserted with the help of a pin shaft to limit the rotation. At this time, the nut 42 is turned by a wrench to loosen the locking mechanism 4, and the locking mechanism 4 is slid to the desired position, and finally the nut 42 is tightened.

[0051] Based on the above embodiment, the first frame 11 and the second frame 12 are both provided with grooves 1B at positions corresponding to the guide grooves 1A; the end of the fixing bolt 41 away from the nut 42 is embedded in the groove 1B, ensuring the feasibility of sliding of the long board during adjustment.

[0052] In order to ensure the sealing of the contact surface between the first frame 11 and the second frame 12, the outer edge of the first frame 11 extends an abutment edge 1C toward the second frame 12; and the sum of the depth of the abutment edge 1C and the depth of the groove 1B is greater than the distance between the bolt head and the end face of the second frame 12.

[0053] The present invention also provides a method for adjusting a perforated plate of a preoxidation furnace of a carbon fiber production line that can be adjusted as needed, comprising the following steps: according to process requirements, a corresponding locking mechanism 4 on a first air permeable layer 2 or a second air permeable layer 3 that needs to be adjusted is loosened and unlocked by an unlocking tool;

[0054] The position of the first long board 21 or the second long board 31 on the corresponding air permeable layer is adjusted by sliding the position of the locking mechanism 4, and the moved locking mechanisms 4 are pre-locked one by one to achieve pre-adjustment of the position of the long board;

[0055] After all the pre-adjustments are completed, the levelness of all the long boards is calibrated by using a level meter, and the locking mechanisms 4 corresponding to the calibrated long boards are locked in turn.

[0056] During the above adjustment process, the pre-locking and locking steps of the locking mechanism 4 can ensure that the long strips are firm and stable after adjustment, avoiding safety hazards caused by displacement or loosening of the long strips during use. Using a level meter to calibrate the horizontality of the long strips can ensure that the long strips are installed flat, and can accurately control the positions of the first long strips 21 and the second long strips 31 on the air permeable layer, thereby accurately adjusting the size and distribution of the throttling holes 2A to achieve precise control of the airflow distribution.

[0057] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A perforated plate of a pre-oxidation furnace for a carbon fiber production line which can be adjusted as needed, arranged on the dividing surface of two adjacent chambers in the oxidation furnace, characterized in that: It comprises an installation frame, and a first air permeable layer arranged in the installation frame at the air outlet side and a second air permeable layer arranged in the installation frame at the air inlet side; A plurality of first long strips are arranged along a first direction on the first air permeable layer, and a plurality of second long strips are arranged along a second direction on the second air permeable layer, and the plurality of first long strips and the plurality of second long strips are arranged crosswise to form throttling holes and blocking surfaces distributed at intervals in the gaps between two adjacent first long strips and two adjacent second long strips; Wherein, locking mechanisms are provided at both ends of the first long strip and the second long strip, and a plurality of the locking mechanisms are slidably arranged in the guide grooves of the frames around the installation frame; Guide plates are arranged on the first plurality of long strips of the first air-permeable layer, and the guide plates are arranged obliquely along the airflow direction.

2. The orifice plate of the pre-oxidation furnace for a carbon fiber production line that can be adjusted on demand according to claim 1 is characterized in that: The first long strip plate and the second long strip plate are both made of metal sheet structure.

3. The orifice plate of the pre-oxidation furnace for a carbon fiber production line that can be adjusted on demand according to claim 1 is characterized in that: The plurality of first long strips and the plurality of second long strips are arranged at equal intervals.

4. The orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as required according to claim 1 is characterized in that: The plurality of first long strips are arranged at equal intervals, and the distribution intervals of the plurality of second long strips gradually increase along the gas guide direction.

5. The orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as required according to claim 1 is characterized in that: The plurality of the second long strips are arranged at equal intervals, and the distribution intervals of the plurality of the first long strips gradually increase along the gas guide direction.

6. The orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as required according to claim 1 is characterized in that: A hinge structure is provided at the connection between the first long strip and the guide plate, the hinge structure comprises a fixing seat fixed on the first long strip and a connecting seat fixed on the guide plate, a hinge shaft is provided on the connecting seat, a locking hole is provided on the fixing seat for the hinge shaft to be embedded, and a locking gap is provided on the fixing seat corresponding to the locking hole; The hinge shaft and the fixing seat are both provided with positioning holes for the pin shaft to be inserted.

7. The orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as required according to claim 1 is characterized in that: The installation frame includes a first frame body for installing the first air-permeable layer and a second frame body for installing the second air-permeable layer; The two ends of the first strip are fixed to the opposite frames of the first frame through the locking mechanism; The two ends of the second strip are fixed to the opposite frames of the second frame through the locking mechanism; Wherein, the locking mechanism comprises a fixing bolt and a nut, and the fixing bolt passes through the first strip and the protruding end of the first frame in sequence and is connected to the nut; The fixing bolt passes through the second strip and the protruding end of the second frame in sequence and is connected to the nut.

8. The orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as required according to claim 7 is characterized in that: The first frame and the second frame are both provided with grooves corresponding to the guide grooves; One end of the fixing bolt away from the nut is embedded in the groove.

9. The orifice plate of the pre-oxidation furnace of the carbon fiber production line which can be adjusted as required according to claim 8 is characterized in that: The outer edge of the first frame body extends an abutment edge toward the second frame body; Furthermore, the sum of the depth of the abutting edge and the depth of the groove is greater than the distance between the head of the fixing bolt and the end surface of the second frame body.

10. A method for adjusting the orifice plate of a preoxidation furnace of a carbon fiber production line that can be adjusted on demand as described in any one of claims 1 to 9, characterized in that: The following steps are involved: According to the process requirements, the corresponding locking mechanism on the first air permeable layer or the second air permeable layer that needs to be adjusted is loosened and unlocked by using an unlocking tool; The position of the first long board or the second long board on the corresponding air permeable layer is adjusted by sliding the position of the locking mechanism, and the locking mechanisms moved into position are pre-locked one by one to achieve pre-adjustment of the position of the long board; After all pre-adjustments are completed, the levelness of all long boards is calibrated by using a level meter, and the locking mechanisms corresponding to the calibrated long boards are locked in turn.

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