Exhaust hood and exhaust device for furnace mouth of carbonization furnace for producing carbon fibers

Abstract

The invention provides an exhaust hood for a furnace mouth of a carbonization furnace for producing carbon fibers. The exhaust hood comprises an exhaust hood body, a movable insertion plate and a displacement controller, the upper end of the exhaust hood body is communicated with an air pipe, and the lower end of the exhaust hood body is a rectangular hood opening. The movable insertion plate is movably connected to the cover opening; the length of the movable inserting plate is not smaller than that of the cover opening, and the width of the movable inserting plate is not smaller than that of the cover opening; one side of the movable insertion plate is provided with scales; the displacement controller is arranged on one side of the exhaust hood body; and the displacement controller is opposite to the scales. Through cooperation of the displacement controller and the movable insertion plate, the air speed of the air suction face of the hood opening is adjustable under the condition that the exhaust air rate of the hood opening is certain, the exhaust air rate of the hood opening is adjustable under the condition that the air speed of the air suction face of the hood opening is certain, and accurate air quantity control and air suction face air speed control are achieved; and finally, the aim of discharging toxic and harmful gases and carbon powder under the condition that the fiber tows are not shaken is fulfilled.

Description

Technical Field

[0001] The present invention belongs to the field of HVAC engineering technology in the fields of petrochemical, chemical fiber, medicine, thermal power plant, etc., especially to a carbon fiber plant with purification requirements that can generate high-temperature exhaust gas, and specifically relates to an exhaust hood for a carbonization furnace mouth for producing carbon fiber. In addition, the present invention also relates to an exhaust device for a carbonization furnace mouth for producing carbon fiber. Background Art

[0002] In the field of carbon fiber production, when the fiber bundles enter and exit the carbonization furnace, toxic and harmful gases in the furnace, such as hydrogen sulfide and hydrocyanic acid, will overflow from the furnace as the fiber bundles are transferred, accompanied by a large amount of carbon powder. At the same time, the temperature of this part of the exhaust gas is relatively high. Therefore, local exhaust hoods are set at the inlet and outlet of the carbonization furnace during design to absorb toxic and harmful high-temperature gases and carbon powder to ensure the local environment for personnel operations. This is also in line with the people-oriented development concept.

[0003] During the production process, since the fiber bundles are very thin, small in diameter and light in weight, the external airflow will interfere with the transmission of the bundles. When the wind speed on the suction side of the furnace exhaust hood is high, the wire surface will shake and a large number of broken wires will be produced; when the wind speed on the suction side of the furnace exhaust hood is low, the exhaust gas and carbon powder removal effect is not good. Therefore, in actual production, the exhaust effect of the hood, especially the wind speed on the suction side, needs to be adjusted according to the process production flow.

[0004] At present, the conventional idea of ​​designers is to add a frequency converter to the exhaust fan. This idea can adjust the wind speed on the suction side of the exhaust hood, but the cost of the frequency converter is high. In addition, a set of control logic is required for frequency conversion adjustment, which increases the investment cost of the project. At the same time, due to the conductivity of carbon powder, there is a risk of short circuit when using a frequency converter in a carbon powder environment. In addition, when carbon powder is discharged through the exhaust duct, it will adhere to the inner wall of the exhaust duct, requiring operators to frequently clean the dust, which is a heavy workload. To solve these pain points, it is necessary to design an exhaust hood that can adjust the air volume or wind speed on the suction side of the hood, achieve a reasonable exhaust effect according to the actual size and weight of the tow, and solve the dust cleaning problem at the same time. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, so that the wind speed of the suction surface of the hood opening can be adjusted when the exhaust volume of the hood opening is certain, and the wind speed of the suction surface of the hood opening can be adjusted when the wind speed of the suction surface of the hood opening is certain, so as to discharge toxic and harmful gases and carbon powder without causing the fiber bundle to shake, and utilize the shielded airflow to produce a good exhaust effect, while facilitating dust cleaning.

[0006] The present invention is achieved through the following technical solutions:

[0007] One of the purposes of the present invention is to provide an exhaust hood for a carbonization furnace for producing carbon fiber, comprising

[0008] The exhaust hood body has an upper end connected to the air duct and a hood opening at the lower end; the hood opening is rectangular;

[0009] A movable plugboard is movably connected to the cover opening; the length of the movable plugboard is not less than the length of the cover opening, and the width of the movable plugboard is not less than the width of the cover opening; one side of the movable plugboard is provided with a scale;

[0010] The displacement controller is arranged on one side of the exhaust hood body; the displacement controller is opposite to the scale.

[0011] In a preferred embodiment of the present invention, the displacement controller comprises:

[0012] An infrared detection component, which is configured to perform infrared imaging of the scale position of the movable plugboard and transmit the infrared imaging to the digital image recognition component;

[0013] A digital image recognition component, which is configured to receive the infrared imaging and identify the specific scale value corresponding to the movable plugboard;

[0014] The control processor is configured to receive the specific scale value of the movable plug plate, call the calculation module, and calculate the real-time hood opening air volume or hood opening suction surface wind speed at the lower end of the exhaust hood body.

[0015] In a preferred embodiment of the present invention, the displacement controller further comprises a display module, which is configured to receive and display the hood opening air volume or the hood opening suction surface wind speed transmitted by the control processor.

[0016] In a preferred embodiment of the present invention, the display module is configured to receive an instruction for setting an operating mode and transmit the instruction to the control processor.

[0017] In a preferred embodiment of the present invention, the exhaust hood for the carbonization furnace for producing carbon fiber further comprises:

[0018] Two shielding hoods are provided outside two opposite sides of the exhaust hood body respectively; the shielding hood and the side of the exhaust hood body form a shielding airflow channel;

[0019] There are two shielded fans; the two shielded fans are respectively connected to two shielded airflow channels.

[0020] In a preferred embodiment of the present invention, the shielded fan is an EC fan.

[0021] In a preferred embodiment of the present invention, the exhaust hood for the mouth of the carbonization furnace for producing carbon fiber further comprises a filter element, which is arranged inside the air duct; the filter element is arranged horizontally.

[0022] In a preferred embodiment of the present invention, the filter element is detachably connected to the air duct.

[0023] The second object of the present invention is to provide an exhaust device for the mouth of a carbonization furnace for producing carbon fiber, comprising an exhaust fan, an air duct and an exhaust hood for the mouth of a carbonization furnace for producing carbon fiber as described in one of the objects of the present invention; wherein the upper end of the air duct is connected to the exhaust fan, and the lower end is connected to the upper end of the exhaust hood.

[0024] In a preferred embodiment of the present invention,

[0025] The exhaust fan is a speed-adjustable fan;

[0026] An air volume sensor is provided at the inlet of the exhaust fan, and the air volume sensor is configured to detect the real-time air volume of the exhaust hood body and control the exhaust fan to adjust its speed according to the change of the real-time air volume.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The exhaust hood for the carbonization furnace mouth of the carbon fiber production of the present invention cooperates with the displacement controller and the movable plug plate, so that the hood mouth exhaust volume is constant and the hood mouth suction surface wind speed is adjustable, and the hood mouth suction surface wind speed is constant. The hood mouth exhaust volume is adjustable, and the hood mouth suction surface wind speed is adjusted, so as to realize precise air volume control and suction surface wind speed control, and finally realize the purpose of exhausting toxic and harmful gases and carbon powder without causing the fiber bundle to shake.

[0029] 2. The exhaust hood for the carbonization furnace mouth of the carbonization furnace for producing carbon fiber of the present invention can form a shielded airflow channel between the exhaust hood body and the shielded air hood. The shielded airflow in the shielded airflow channel can form a negative pressure cavity at the furnace mouth to prevent the exhaust gas from overflowing. At the same time, the generated shielded airflow can reduce the entrained airflow in the environment, greatly improve the exhaust effect, reduce the power load of the exhaust fan, and save energy. At the same time, the shielded airflow will not affect the fiber bundles under the exhaust hood.

[0030] 2. The exhaust hood for the furnace mouth of the carbonization furnace for producing carbon fiber of the present invention is provided with a detachable and washable filter element, which is convenient for dust cleaning and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a right side cross-sectional view of an exhaust hood for a carbonization furnace for producing carbon fiber according to the present invention;

[0032] Figure 2This is a front cross-sectional view of an exhaust hood for a carbonization furnace for producing carbon fibers according to the present invention;

[0033] Figure 3 This is an overall structural diagram of an exhaust hood for a carbonization furnace for producing carbon fibers according to the present invention;

[0034] In the figure, 1-exhaust hood body; 2-filter element; 3-movable plug-in board; 4-displacement controller; 5-EC fan; 6-shielded hood. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0036] like Figures 1 to 3 As shown, the present invention provides a special exhaust hood for exhausting air from a carbonizing furnace, which comprises: an exhaust hood body 1, a movable plug plate 3, and a displacement controller 4. Figure 3 As shown (Description: Figure 3 The shielding hood 6 is not shown in the figure. The upper end of the exhaust hood body 1 of this embodiment is connected to the air duct, and the lower end is a hood opening. The hood opening of the exhaust hood body 1 is rectangular, wherein two opposite sides correspond to the long sides, and the other two opposite sides correspond to the short sides. The length of the movable plug plate 3 is not less than the length of the hood opening at the lower end of the exhaust hood body 1, and the width of the movable plug plate 3 is not less than the width of the hood opening at the lower end of the exhaust hood body 1. The movable plug plate 3 can fully cover the hood opening at the lower end of the exhaust hood body 1.

[0037] Specifically, the movable plug plate 3 is movably connected to the hood opening at the lower end of the exhaust hood body 1, so that the operator can adjust the extension and contraction amount of the movable plug plate 3, thereby adjusting the suction area at the hood opening of the exhaust hood body 1, and ensuring the exhaust effect. In one embodiment of the present invention, the lower edges of the two opposite sides of the exhaust hood body 1 corresponding to the short side are provided with connecting grooves, and the two opposite sides of the movable plug plate 3 (in this embodiment, the two opposite sides are short sides) are provided with plug-ins, which match the connecting grooves, thereby realizing the movable connection of the movable plug plate 3 and the exhaust hood body 1. It should be noted that this movable connection method does not constitute a limitation on the present invention; the movable plug plate 3 can be movably connected to the two opposite sides of the exhaust hood body 1 corresponding to the short side, which does not constitute a limitation on the present invention.

[0038] A scale is provided on one of the short sides of the movable plugboard 3, so that the displacement controller 4 can identify the scale thereon, and then calculate the real-time hood opening air volume or hood opening suction surface wind speed. The displacement controller 4 is arranged on one side of the exhaust hood body 1, and corresponds to the scale on the movable plugboard 3. The displacement controller 4 can automatically identify the extension and contraction amount of the movable plugboard 3, and can calculate the open area of ​​the lower end hood opening of the exhaust hood body 1 (that is, the suction area of ​​the hood opening of the exhaust hood body 1), and then calculate the real-time hood opening air volume or hood opening suction surface wind speed.

[0039] In one embodiment of the present invention, the displacement controller 4 includes an infrared detection component, a digital image recognition component and a control processor. The infrared detection component is configured to perform infrared imaging of the scale position of the movable plugboard 3 and transmit it to the digital image recognition component; specifically, the infrared detection component is provided with a probe, and the scale of the movable plugboard 3 is imaged by the infrared imaging principle. The digital image recognition component is configured to receive the infrared imaging and identify the specific scale value corresponding to the movable plugboard 3, which is the width of the lower end of the hood opening of the exhaust hood body 1, that is, the telescopic amount of the movable plugboard 3. The control processor is configured to receive the specific scale value of the movable plugboard 3, call the calculation module, calculate the area of ​​the lower end of the hood opening of the exhaust hood body 1 (that is, the suction area of ​​the hood opening of the exhaust hood body 1), and then calculate the real-time hood opening air volume or hood opening suction surface wind speed. It should be noted that the air suction area of ​​the hood opening of the exhaust hood body 1 is the width of the opening at the lower end of the exhaust hood body 1 multiplied by the length of the opening at the lower end of the exhaust hood body 1 .

[0040] Specifically, when the operator manually adjusts the extension and contraction amount of the movable plugboard 3, the infrared detection component can identify the position of the movable plugboard 3 and transmit it to the digital image recognition component. The digital image recognition component receives the position of the movable plugboard 3, obtains the specific scale value corresponding to the movable plugboard 3, and transmits it to the control processor. The control processor receives the specific scale value corresponding to the movable plugboard 3, calls the calculation module, calculates the suction area of ​​the hood opening of the exhaust hood body 1, and performs real-time calculation of the suction surface wind speed or hood opening air volume of the hood opening based on the suction area.

[0041] The air volume of the hood opening of the exhaust hood body 1 = the suction area of ​​the hood opening of the exhaust hood body 1 × the suction surface wind speed of the hood opening of the exhaust hood body 1. In the constant wind speed mode (i.e., the suction surface wind speed of the hood opening of the exhaust hood body 1 is constant), the suction surface wind speed is preset and known, and the calculation module multiplies the preset hood suction surface wind speed by the hood suction area to obtain the air volume of the hood opening of the exhaust hood body 1. It should be noted that in the process of adjusting the movable plugboard 3, the air volume obtained by the calculation module also changes in real time. The air volume is used to help the operator adjust the telescopic amount of the movable plugboard 3, and then adjust the suction area of ​​the hood opening of the exhaust hood body 1 by adjusting the telescopic amount of the movable plugboard 3, and finally adjust the air volume of the hood opening of the exhaust hood body 1 to ensure the exhaust effect. In the constant air volume mode (i.e., the air volume of the hood opening of the exhaust hood body 1 is constant), the air volume is preset and known, and the calculation module divides the preset air volume by the suction area to obtain the suction surface wind speed. The suction surface wind speed is used to help the operator adjust the extension and contraction of the movable plug plate 3, and then by adjusting the extension and contraction of the movable plug plate 3, the suction surface wind speed of the hood opening of the exhaust hood body 1 can be adjusted (i.e., the suction force of the suction surface is adjusted) to ensure the exhaust effect.

[0042] In a preferred embodiment of the present invention, the displacement controller 4 is provided with a display module, which is configured to receive the air volume at the hood opening of the exhaust hood body 1 or the wind speed on the suction surface of the hood opening of the exhaust hood body 1 calculated by the control processor, and to display the air volume and the wind speed on the suction surface. The operator can observe the current air volume and wind speed on the suction surface more intuitively, and adjust the extension and contraction amount of the movable plug plate 3 accordingly. In addition, the display module of the displacement controller 4 is also configured to receive instructions from the operator to set the operating mode. The exhaust hood for the carbonization furnace mouth of the carbonization furnace for producing carbon fiber of the present invention has two operating modes, namely a constant air volume control mode and a constant wind speed control mode. It should be noted that when receiving the instruction to set the operating mode, the setting of the wind speed or air volume value is also received. For example, after receiving the instruction of the constant air volume control mode, the setting of the specific value of the air volume is received.

[0043] The special exhaust hood used for carbonization furnace exhaust can realize two operation modes. Before introducing the two operation modes, it should be noted that the carbonization furnace mouth in the carbon fiber field is a pollution source, and toxic and harmful gas detectors are installed around the furnace mouth. When the concentration of harmful gases exceeds the standard, an alarm will be automatically triggered.

[0044] The first operating mode - constant air volume control mode

[0045] In this mode, the frequency of the external exhaust fan is constant, and the air volume of the exhaust hood body 1 is constant. By adjusting the extension and contraction of the movable plug plate 3, the suction area of ​​the exhaust hood body 1 is changed, thereby changing the suction surface wind speed of the exhaust hood body 1, thereby affecting the exhaust effect. Specifically, when the air volume of the exhaust hood body 1 is constant, the greater the suction surface wind speed, the more conducive to improving the exhaust effect. Since the suction volume of the exhaust hood body 1 = the suction area of ​​the exhaust hood body 1 × the suction surface wind speed of the exhaust hood body 1, the greater the suction surface wind speed, the smaller the suction area of ​​the exhaust hood body 1. At the same time, toxic and harmful gas detectors are set around the furnace mouth, and when the concentration of harmful gases exceeds the standard, an alarm will be automatically sounded; and when the suction surface wind speed of the exhaust hood body 1 is large, the silk surface will shake, resulting in a large number of broken silk.

[0046] It can be seen that in the constant air volume control mode, the suction area of ​​the hood opening of the exhaust hood body 1 cannot be too large, otherwise the wind speed on the suction surface is insufficient and the exhaust effect is poor, which will cause the concentration of harmful gases to exceed the standard, and then trigger the toxic and harmful gas detector to automatically alarm; at the same time, the suction area of ​​the hood opening of the exhaust hood body 1 cannot be too small, otherwise the wind speed on the suction surface is too high, which will cause the wire surface to shake and produce a large number of broken wires. In the constant air volume control mode, first, it must not trigger the automatic alarm of the toxic and harmful gas detector, second, it must not cause the wire surface to shake, and third, it must be able to maximize the wind speed on the suction surface under the premise of meeting the first two conditions, which is the optimal exhaust effect.

[0047] During actual operation, the initial suction area of ​​the exhaust hood body 1 is large, and the wind speed of the suction surface is small, the suction force is small, the exhaust effect is not good, the toxic and harmful gases exceed the standard, and the toxic and harmful gas detector is triggered to automatically alarm. The displacement controller 4 obtains the extension amount of the movable plugboard 3, and calculates the current wind speed of the suction surface based on this (since this mode is a fixed air volume control mode, the displacement controller 4 always displays the fixed air volume). At this time, the operator observes the air volume and wind speed of the suction surface displayed by the displacement controller 4, and slowly moves the movable plugboard 3 to reduce the suction area of ​​the hood opening of the exhaust hood body 1. As the suction area of ​​the hood opening of the exhaust hood body 1 gradually decreases, the wind speed of the suction surface gradually increases, the suction force increases, and the exhaust effect gets better and better. When the movable plugboard 3 moves to a certain position, the toxic and harmful detector no longer alarms, and the suction area of ​​the exhaust hood body 1 can continue to be reduced to further enhance the exhaust effect. When the movable plugboard 3 moves to a certain position, the silk surface begins to shake. At this time, the suction area of ​​the exhaust hood body 1 is increased until the silk surface no longer shakes. The toxic and harmful detector no longer alarms and the silk surface no longer shakes. At this time, the suction surface wind speed is the optimal suction surface wind speed, and the exhaust effect is the best.

[0048] If the wire bundle is very fine, in the process of reducing the suction area of ​​the exhaust hood body 1, the wire surface may have begun to shake when the toxic and harmful detector is still alarming. In this case, an exhaust hood body 1 can be added to ensure the exhaust effect. The process of seeking the optimal exhaust effect is the same as above and will not be repeated here.

[0049] The constant air volume control mode is mainly used when the capacity of the exhaust gas treatment equipment has been determined. By adjusting the extension and contraction of the movable plug plate 3, the wind speed of the suction surface of the hood opening of the exhaust hood body 1 is changed to seek the optimal solution for the exhaust effect. In particular, when the filament bundle under the hood opening of the exhaust hood body 1 is very thin, the wind speed of the suction surface of the hood opening cannot be too large.

[0050] The second operating mode - constant wind speed control mode

[0051] In this mode, the wind speed of the suction surface of the hood opening of the exhaust hood body 1 remains unchanged. By adjusting the extension and contraction amount of the movable plug plate 3, the suction area of ​​the hood opening of the exhaust hood body 1 is changed, thereby adjusting the air volume of the hood opening of the exhaust hood body 1, and then affecting the exhaust effect. At this time, the external exhaust fan needs to be a speed-regulating fan. It should be noted that the exhaust fan connected to the exhaust hood body 1 is provided with an air volume sensor at its inlet. When the displacement controller 4 is set to the constant wind speed control mode, the air volume sensor starts to operate. The air volume sensor is configured to detect the real-time air volume of the exhaust hood body 1 on the one hand, and is configured to control the exhaust fan to adjust the speed according to the change of the real-time air volume on the other hand. That is, as the extension and contraction amount of the movable plug plate 3 changes, the air volume sensor controls the exhaust fan to adjust the speed according to the change of the real-time air volume, so as to maintain the wind speed of the suction surface of the hood opening of the exhaust hood body 1 unchanged. The speed-regulating fan and air volume sensor are commercially available products.

[0052] This mode is particularly suitable for situations where the vertical distance between the wire bundle surface and the hood opening is unknown, or the distance deviates from the designed distance due to on-site assembly. In the case where the vertical distance between the wire bundle surface and the hood opening is unknown, the higher the installation position of the exhaust hood body 1, the larger the suction area of ​​the hood opening of the exhaust hood body 1 needs to be to exhaust air and prevent the concentration of harmful gases from exceeding the standard and the toxic and harmful gas detector from automatically alarming; similarly, in the case where the distance deviates from the designed distance due to on-site assembly, it is also necessary to increase the suction area of ​​the hood opening of the exhaust hood body 1 to exhaust air and prevent the concentration of harmful gases from exceeding the standard and the toxic and harmful gas detector from automatically alarming.

[0053] Specifically, when the wind speed on the suction surface is constant, the larger the suction area of ​​the hood opening of the exhaust hood body 1, the more conducive it is to improving the exhaust effect. This is because the air volume of the hood opening of the exhaust hood body 1 = the suction area of ​​the hood opening of the exhaust hood body 1 × the wind speed of the suction surface of the hood opening of the exhaust hood body 1, so the larger the suction area of ​​the hood opening of the exhaust hood body 1, the larger the area it can cover downward, the larger the air volume of the hood opening of the exhaust hood body 1, and the lower the concentration of harmful gases.

[0054] It can be seen that the suction area of ​​the hood opening of the exhaust hood body 1 cannot be too small, otherwise the exhaust hood body 1 will not cover enough and the exhaust effect will be poor, which will cause the concentration of harmful gases to exceed the standard, thereby triggering the toxic and harmful gas detector to automatically alarm; at the same time, the suction area of ​​the hood opening of the exhaust hood body 1 cannot be too large, otherwise it will cause the consumption of the multi-speed adjustable exhaust fan. In the fixed wind speed control mode, on the one hand, it is necessary not to trigger the automatic alarm of the toxic and harmful gas detector, and on the other hand, to minimize the consumption of the exhaust fan, that is, the optimal exhaust effect.

[0055] In actual operation, the initial suction area of ​​the hood opening of the exhaust hood body 1 is small. At this time, the suction area coverage of the hood opening of the exhaust hood body 1 is small, the exhaust effect is not good, and the toxic and harmful gases exceed the standard, triggering the toxic and harmful gas detector to automatically alarm. The displacement controller 4 obtains the extension amount of the movable plugboard 3, and calculates the current air volume based on this (since this mode is a fixed wind speed control mode, the displacement controller 4 always displays the fixed suction surface wind speed). At this time, the operator observes the air volume and suction surface wind speed displayed by the displacement controller 4, and slowly moves the movable plugboard 3 to increase the suction area of ​​the hood opening of the exhaust hood body 1. As the suction area of ​​the hood opening of the exhaust hood body 1 gradually increases, the suction area coverage of the hood opening of the exhaust hood body 1 gradually increases, and the exhaust effect is getting better and better. When the movable plugboard 3 moves to a certain position, the toxic and harmful detector no longer alarms, indicating that the suction area of ​​the hood opening of the exhaust hood body 1 is the optimal suction area at this time, and the exhaust effect is best on the basis of minimizing the consumption of the exhaust fan.

[0056] In a preferred embodiment of the present invention, the dedicated exhaust hood for exhausting the carbonization furnace port includes a shielding hood 6, which is sleeved on the outside of both sides of the exhaust hood body 1 (such as Figure 1 As shown), the shielding hood 6 is not connected to the air duct, and two air outlets are formed between the lower end of the shielding hood 6 and the lower ends of the two side surfaces corresponding to the two short sides of the exhaust hood body 1, and the length direction of the two air outlets is parallel to the moving direction of the filament bundle. A shielding airflow channel is formed between the exhaust hood body 1 and the shielding hood 6, and a shielding fan is provided on the shielding hood 6. The shielding airflow channel is connected to the shielding fan, which generates a shielding airflow flowing downward (as shown in FIG. Figure 2As shown in the figure, the shielding airflow can form a negative pressure cavity at the furnace mouth (i.e., inside the exhaust hood body 1) to prevent the exhaust gas from overflowing, and can also reduce the airflow in the environment, greatly improving the exhaust effect. The shielding airflow flowing downward is discharged from the two opposite sides of the exhaust hood body 1 corresponding to the short side, and the two opposite sides of the exhaust hood body 1 corresponding to the long side do not discharge air, which will not affect the filament bundle. This is because the forward direction of the filament bundle is parallel to the two opposite sides of the exhaust hood body 1 corresponding to the short side. If the two opposite sides of the exhaust hood body 1 corresponding to the long side also discharge air, the filament bundle will shake toward these two sides. Figure 1 The swaying of the yarn bundle back and forth in the figure will cause the yarn to break. Figure 2 The position of the shielded fan does not constitute a limitation to the present invention, as long as the shielded airflow channel can be positively pressurized, i.e., greater than the standard atmospheric pressure. More preferably, the shielded fan is an EC fan 5, which can not only run silently, but also has low noise and vibration, and will not affect the tow.

[0057] In another preferred embodiment of the present invention, the special exhaust hood for exhausting the carbonizing furnace mouth also includes a filter 2. The filter 2 is arranged inside the air duct above the exhaust hood body 1. The filter 2 is arranged horizontally. Preferably, the filter 2 is detachably connected to the air duct, which is convenient for cleaning, dust removal and replacement of the filter 2 and can save costs. In this embodiment, the filter 2 is a pull-out primary filter. After using it for a period of time, the operator can pull out the primary filter, clean it, and then insert it into the air duct for continued use after cleaning.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0060] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. An exhaust hood for a carbonization furnace for producing carbon fiber, characterized in that: include The exhaust hood body has an upper end connected to the air duct and a hood opening at the lower end; the hood opening is rectangular; A movable plugboard is movably connected to the cover opening; the length of the movable plugboard is not less than the length of the cover opening, and the width of the movable plugboard is not less than the width of the cover opening; one side of the movable plugboard is provided with a scale; The displacement controller is arranged on one side of the exhaust hood body; the displacement controller is opposite to the scale.

2. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 1, characterized in that: The displacement controller comprises: An infrared detection component, which is configured to perform infrared imaging of the scale position of the movable plugboard and transmit the infrared imaging to the digital image recognition component; A digital image recognition component, which is configured to receive the infrared imaging and identify the specific scale value corresponding to the movable plugboard; The control processor is configured to receive the specific scale value of the movable plug plate, call the calculation module, and calculate the real-time hood opening air volume or hood opening suction surface wind speed at the lower end of the exhaust hood body.

3. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 2, characterized in that: The displacement controller also includes a display module, which is configured to receive and display the hood opening air volume or the hood opening air suction surface wind speed transmitted by the control processor.

4. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 3, characterized in that: The display module is configured to receive an instruction for setting an operating mode and transmit the instruction to the control processor.

5. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 1, characterized in that: Also includes: Two shielding hoods are provided outside two opposite sides of the exhaust hood body respectively; the shielding hood and the side of the exhaust hood body form a shielding airflow channel; There are two shielded fans; the two shielded fans are respectively connected to two shielded airflow channels.

6. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 5, characterized in that: The shielded fan is an EC fan.

7. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 1, characterized in that: It also includes a filter element, which is arranged inside the air duct; the filter element is arranged horizontally.

8. The exhaust hood for the carbonization furnace mouth for producing carbon fiber according to claim 7, characterized in that: The filter element is detachably connected to the air duct.

9. An exhaust device for a carbonization furnace for producing carbon fiber, characterized in that: It comprises an exhaust fan, an air duct and an exhaust hood for a carbonization furnace for producing carbon fiber as claimed in any one of claims 1 to 8; wherein the upper end of the air duct is connected to the exhaust fan, and the lower end is connected to the upper end of the exhaust hood.

10. The exhaust device for the mouth of a carbonization furnace for producing carbon fiber according to claim 9, characterized in that: The exhaust fan is a speed-adjustable fan; An air volume sensor is provided at the inlet of the exhaust fan, and the air volume sensor is configured to detect the real-time air volume of the exhaust hood body and control the exhaust fan to adjust its speed according to the change of the real-time air volume.

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