A drying area waste gas purification and dynamic fly capturing and filtering system of a whole pulp combined machine

Abstract

The present application belongs to the technical field of textile filtering system, and particularly relates to a waste gas purification and flying particle dynamic capture filtering system for drying area of a whole sizing combined machine, comprising a filtering device for filtering waste gas containing flying particles and a plurality of gas collection hoods equidistantly installed on the top of the drying area of the whole sizing combined machine, the plurality of gas collection hoods are connected in parallel to the same main pipeline through branch pipelines, one end of the main pipeline is communicated with the air inlet of the filtering device, and the plurality of gas collection hoods are each provided with an independent lifting mechanism. The present application can accurately capture flying particles, the visual system can real-time locate the flying particle concentration area, and the gas collection hoods can act as required, thereby avoiding the disadvantages of invalid suction of the whole area in the traditional scheme, greatly improving the capture efficiency, optimizing the dynamic air volume, and realizing the advanced capture of flying particles and avoiding the air flow impact on the cloth surface by setting the change of the communication area as "first increasing and then decreasing" in the descending stroke, so as to integrate the capture efficiency and process safety.

Description

Technical Field

[0001] This invention belongs to the technical field of textile filtration systems, specifically relating to a waste gas purification and fly waste dynamic capture and filtration system for the drying zone of a sizing and finishing machine. Background Technology

[0002] A sizing and warping machine is a specialized piece of equipment that combines the two textile preparation processes of warping and sizing into one. It is widely used in the textile industry. In the drying zone of the sizing and warping machine, yarn or fabric is sized and then enters the drying room for drying. During this process, the fuzz on the surface of the yarn breaks off under the action of high-temperature hot air, forming a large amount of fly filaments (short fiber flocculent material). These fly filaments not only pollute the workshop environment and endanger the health of the operators, but may also be dispersed to other parts of the equipment by the hot air circulation system, affecting product quality and equipment operation stability.

[0003] In existing technologies, the drying zone of a pulping and finishing machine is typically equipped with a fixed air collection hood and filtration system. Continuous air intakes are installed at the top of the drying zone along the entire drying tunnel to extract the waste gas containing fly ash from the drying zone with a constant airflow. However, this traditional solution has the following shortcomings:

[0004] The generation of fly waste in the drying zone exhibits obvious regional concentration and temporal dynamics. Fly waste is only generated on a large scale after the fabric has been dried. Furthermore, due to differences in fiber characteristics, yarn structure, moisture content, and drying process parameters such as temperature, wind speed, and machine speed, different types of fabrics will have different locations in the drying zone where fly waste is generated on a large scale. Traditional solutions continuously extract air with a uniform air volume throughout the entire drying tunnel, which cannot dynamically adjust the collection position according to the actual fly waste generation area. As a result, most of the air volume is consumed in areas with no or few fly waste, leading to low collection efficiency and high energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a waste gas purification and fly waste dynamic capture and filtration system for the drying zone of a pulping and finishing machine, which can achieve precise capture to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a waste gas purification and fly waste dynamic capture and filtration system for the drying zone of a pulping and finishing machine, comprising a filter device for filtering waste gas containing fly waste and several gas collection hoods equidistantly installed on the top of the drying zone of the pulping and finishing machine, wherein the several gas collection hoods are all connected in parallel to the same main pipe through branch pipes, and one end of the main pipe is connected to the air inlet of the filter device.

[0007] Each of the aforementioned gas collection hoods is equipped with an independent lifting mechanism to drive the gas collection hood to move up and down relative to the fabric surface;

[0008] A linkage air volume adjustment mechanism is provided between the gas collection hood and the branch pipe. The linkage air volume adjustment mechanism is linked to the lifting and lowering movement of the gas collection hood to change the communication area between the gas collection hood and the branch pipe.

[0009] The linkage action is to make the connection area between the air collecting hood and the branch pipe change according to the following rules during the descent of the air collecting hood: the connection area first increases and then decreases as the air collecting hood descends, and when the air collecting hood descends to the target position, the connection area is greater than the connection area at the initial position, so that the air intake of the air collecting hood gradually increases in the early stage of descent to capture escaped flying flowers, and the air intake decreases in the later stage of descent to avoid the airflow impacting the fabric surface when the air collecting hood approaches the fabric surface. After the air collecting hood stops descending, the connection area is fixed to maintain the air intake for accurate capture of flying flowers.

[0010] The system also includes a vision control module, which is used to acquire image information of the fabric in the drying zone of the pulping machine in real time, identify the target area where fly waste is concentrated, and drive the air collection hood corresponding to the target area to descend according to the target area.

[0011] Furthermore, the lifting mechanism includes symmetrically arranged mounting brackets, one side of which is fixedly connected to an electric telescopic rod for driving the air collection hood to rise and fall. The bottom end of the electric telescopic rod is fixedly connected to the top end of the side wall of the air collection hood, and the top end of the air collection hood is fixedly connected to a telescopic corrugated pipe.

[0012] Furthermore, the linkage air volume adjustment mechanism includes a housing fixedly connected to the bottom end of the branch pipe, the top end of the mounting bracket fixedly connected to one end of the housing, two vertically distributed adjustment plates slidably connected inside the housing, the surface of the adjustment plates having circular holes, the communication area between the air collection hood and the branch pipe being the area of ​​the two circular holes overlapping in the vertical direction, one end of the adjustment plate being fixedly connected to a connecting rod for pushing the adjustment plate to move and change the overlapping area of ​​the two circular holes, the connecting rod penetrating the side wall of the housing, a linear bearing being provided at the connection between the connecting rod and the housing, the bottom end of the housing being fixedly connected to a connecting pipe that overlaps with the branch pipe in the vertical direction, and the top end of the telescopic corrugated pipe being fixedly connected to the bottom end of the connecting pipe.

[0013] Furthermore, square tubes are fixedly connected to both sides of the housing, and connectors are slidably connected inside the square tubes. One end of the connector is fixedly connected to one end of the corresponding connecting rod. A first standard spring that provides a stable thrust to the connector is movably sleeved on the outside of the connecting rod. An elastic pull member is rotatably connected to the middle of the connector.

[0014] Furthermore, one end of the elastic pull member is fixedly connected to the top of the gas collection hood, and the length of the elastic pull member extends and retracts as the gas collection hood rises and falls, so as to change the tension of the elastic pull member on the connector.

[0015] Furthermore, the elastic tension member includes a cylinder rotatably connected inside the connector. The bottom end of the cylinder has a through groove, through which the cylinder passes. A sleeve is slidably connected to the outer wall of the cylinder. One end of the sleeve is rotatably connected to a connecting seat, which is fixedly connected to the side wall of the gas collection hood. A second standard spring is provided inside the cylinder, and the two ends of the second standard spring are fixedly connected to one end of the inner wall of the cylinder and one end of the inner wall of the sleeve, respectively.

[0016] Furthermore, the vision control module includes several vision detection devices for image information acquisition and an interactive controller for information processing. The vision detection devices are signal-connected to the interactive controller, and the filtering device and the electric telescopic rod are both electrically connected to the interactive controller.

[0017] Furthermore, the interactive controller has a built-in control module that generates control commands to drive the gas collection hood to rise and fall according to the following logic:

[0018] Set the high-level start threshold and low-level stop threshold for pollen concentration;

[0019] When the visual detection device detects that the concentration of fly ash in the target area is higher than the high-level start threshold, it generates a command to drive the electric telescopic rod to extend so as to drive the corresponding gas collection hood to descend.

[0020] When the concentration of fly ash in the target area is lower than the low-level stop threshold, the rising delay timer is started.

[0021] If the fly ash concentration exceeds the low-level stop threshold again during the rising delay timer, the timer is reset and the descent state of the gas collection hood is maintained.

[0022] A command to drive the gas collection hood to rise is generated only after the rise delay timer has ended and the fly ash concentration remains below the low-level stop threshold.

[0023] Furthermore, the visual control module uses frame difference method to identify the target area generated by the concentrated fly petals, including:

[0024] Perform grayscale difference operations on continuously acquired image frames to extract dynamic motion regions;

[0025] Calculate the rate of change of the area of ​​the dynamically moving region;

[0026] When the dynamic pixel density of a certain partition exceeds a preset threshold, the partition is determined to be a region where fly-flowers are concentrated.

[0027] Furthermore, when the vision control module drives any of the air collection hoods to descend, it simultaneously sends a power increase command to the air intake fan of the filter device to compensate for the air volume change of the other air collection hoods caused by the increased air intake of that air collection hood.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. Precise collection: The vision system locates the concentrated area of ​​fly ash in real time, and the gas collection hood moves as needed, avoiding the drawbacks of ineffective suction of the entire area in traditional solutions, and greatly improving collection efficiency;

[0030] 2. Dynamic airflow optimization: By setting the connection area change of "increase first and then decrease" during the descent stroke, it not only achieves the advance collection of fly waste, but also avoids the airflow impact on the fabric, combining collection efficiency and process safety.

[0031] 3. Energy saving and consumption reduction: The dust collection hood only operates in the area where fly ash is concentrated, and the air volume changes dynamically with the position of the dust collection hood. It does not need to operate at full load all the time, and the system energy consumption is significantly reduced.

[0032] 4. Purely mechanical linkage, zero delay and high reliability: The change in the connected area depends entirely on the lifting and displacement drive of the gas collection hood itself. There is no need for additional control actuators, no risk of electronic component failure, zero response delay, and no need for additional power supply, making it more energy-efficient. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0034] Figure 2 This is a front view of the present invention;

[0035] Figure 3 This is a schematic diagram of the connection structure between the main pipeline and the gas collection hood of the present invention;

[0036] Figure 4 This is a schematic diagram of the installation structure of the lifting mechanism of the present invention;

[0037] Figure 5 This is a front sectional view of the linkage air volume adjustment mechanism of the present invention;

[0038] Figure 6 The lifting mechanism of the present invention Figure 5 A magnified structural diagram of part A in the middle;

[0039] Figure 7 This is a schematic diagram of the internal structure of the lifting mechanism housing of the present invention.

[0040] The attached diagram lists the components represented by each number as follows:

[0041] 1. Filter device; 2. Air collection hood; 3. Main pipe; 31. Branch pipe; 4. Vision control module; 41. Vision inspection device; 42. Interactive controller; 5. Lifting mechanism; 51. Mounting bracket; 52. Electric telescopic rod; 53. Telescopic corrugated pipe; 6. Linked air volume adjustment mechanism; 61. Housing; 62. Adjusting plate; 63. Connecting rod; 64. Round hole; 65. Connecting pipe; 66. Square tube; 67. Connector; 671. Through groove; 68. First standard spring; 69. Elastic pull element; 691. Cylinder; 692. Sleeve; 693. Second standard spring; 694. Connecting seat. Detailed Implementation

[0042] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0043] Example 1: System Overall Architecture

[0044] like Figures 1-4 As shown, the present invention provides a waste gas purification and fly waste dynamic capture and filtration system for the drying zone of a pulping machine. The application environment is the drying zone of a pulping machine. The drying zone is usually a box-type structure with insulated wall panels. It is equipped with a hot air circulation system and a motor that drives the fabric to move. The fabric moves along the length of the drying zone under the drive of the motor and is gradually dried during the operation.

[0045] In this embodiment, the system mainly includes: a filter device 1, an air collection hood 2, a main pipe 3, a vision control module 4, a lifting mechanism 5, and a linkage air volume adjustment mechanism 6.

[0046] Multiple air collection hoods 2 are arranged sequentially inside the drying zone along the length of the drying zone, i.e. the direction of fabric movement. Adjacent air collection hoods 2 are arranged at equal intervals, and the opening of each air collection hood 2 faces the surface of the fabric to collect the fly shavings generated by the fabric during the drying process.

[0047] Each gas collection hood 2 is equipped with an independent lifting mechanism 5. The lifting mechanism 5 includes symmetrically arranged mounting brackets 51. An electric telescopic rod 52 for driving the gas collection hood 2 to rise and fall is fixedly connected to one side of the mounting bracket 51. The bottom end of the electric telescopic rod 52 is fixedly connected to the top end of the side wall of the gas collection hood 2. A telescopic corrugated pipe 53 is fixedly connected to the top end of the gas collection hood 2. The electric telescopic rod 52 is electrically connected to the vision control module 4. The control command sent by the vision control module 4 drives its telescopic movement, thereby driving the gas collection hood 2 to rise and fall in a direction perpendicular to the fabric surface.

[0048] The preferred travel range of the electric telescopic rod 52 is 0~150mm. When the air collection hood 2 is in the initial position (high position), it is about 120~150mm away from the fabric surface, and when it is in the target position (low position), it is about 20~40mm away from the fabric surface.

[0049] Several air collection hoods 2 are connected in parallel to the same main pipe 3 through branch pipes 31. One end of the main pipe 3 is connected to the air inlet of the filter device 1. A linkage air volume adjustment mechanism 6 is provided between the air collection hood 2 and the branch pipe 31. The linkage air volume adjustment mechanism 6 changes the connection area between the air collection hood 2 and the branch pipe 31 through the lifting and lowering action of the air collection hood 2.

[0050] The filter device 1 is located outside the drying area. The air intake fan of the filter device 1 is used to create negative pressure in the main pipe 3, driving the waste gas containing fly ash from the gas collection hood 2 into the filter device 1 through the main pipe 3.

[0051] The filter device 1 adopts a conventional fabric sizing and drying filter device, which can adsorb and treat VOCs waste gas and fly waste generated during fabric drying.

[0052] The vision control module 4 is used to acquire image information of the fabric in the drying zone of the pulping and finishing machine in real time, and to identify the target area where fly waste is concentrated. Based on the target area, it drives the corresponding air collection hood 2 to descend. The vision control module 4 includes several vision detection devices 41 for image information acquisition and an interactive controller 42 for information processing. The vision detection devices 41 are signal-connected to the interactive controller 42. The filter device 1 and the electric telescopic rod 52 are both electrically connected to the interactive controller 42. The vision detection device 41 includes an industrial camera, a lens and a matching light source. Its installation position and angle should ensure that it can completely cover the partition range corresponding to each air collection hood 2. In a preferred embodiment, the vision detection device 41 uses multiple cameras arranged along the length of the drying zone, and each camera covers one or more partitions of the air collection hood 2.

[0053] The interactive controller 42 is an industrial computer or a programmable logic controller. Its signal input terminal is connected to the vision inspection device 41, and its signal output terminal is connected to the electric telescopic rod 52 and the filter device 1. The interactive controller 42 receives the image data collected by the vision inspection device 41 and processes and analyzes it. When a certain area is identified as a concentrated area for the generation of fly ash, a control command is generated to drive the corresponding air collection hood 2 of that area to descend.

[0054] Example 2: Linked air volume adjustment mechanism and change in connected area

[0055] like Figures 5-7As shown, the linkage air volume adjustment mechanism 6 includes a housing 61 fixedly connected to the bottom end of the branch pipe 31. The top end of the mounting bracket 51 is fixedly connected to one end of the housing 61. Two adjusting plates 62, which are distributed vertically, are slidably connected inside the housing 61. The surface of the adjusting plate 62 is provided with a circular hole 64. The communication area between the air collection hood 2 and the branch pipe 31 is the area of ​​the two circular holes 64 overlapping in the vertical direction. One end of the adjusting plate 62 is fixedly connected to a connecting rod 63 for pushing the adjusting plate 62 to change the overlapping area of ​​the two circular holes 64. The connecting rod 63 passes through the side wall of the housing 61. A linear bearing is provided at the connection between the connecting rod 63 and the housing 61. The bottom end of the housing 61 is fixedly connected to a connecting pipe 65 that overlaps with the branch pipe 31 in the vertical direction. The top end of the telescopic corrugated pipe 53 is fixedly connected to the bottom end of the connecting pipe 65.

[0056] Square tubes 66 are fixedly connected to both sides of the housing 61. Connector 67 is slidably connected inside the square tubes 66. One end of connector 67 is fixedly connected to one end of the corresponding connecting rod 63. A first standard spring 68 is movably sleeved on the outside of the connecting rod 63 to provide a stable thrust to connector 67. Elastic pull member 69 is rotatably connected to the middle of connector 67.

[0057] One end of the elastic pull member 69 is fixedly connected to the top of the gas collection hood 2. The length of the elastic pull member 69 extends and retracts as the gas collection hood 2 rises and falls, so as to change the tension of the elastic pull member 69 on the connector 67.

[0058] The elastic pull member 69 includes a cylinder 691 rotatably connected inside the connector 67. A through groove 671 is provided at the bottom end of the square tube 66, through which the cylinder 691 passes. A sleeve 692 is slidably connected to the outer wall of the cylinder 691. A connecting seat 694 is rotatably connected to one end of the sleeve 692. The connecting seat 694 is fixedly connected to the side wall of the gas collection hood 2. A second standard spring 693 is provided inside the cylinder 691. The two ends of the second standard spring 693 are fixedly connected to one end of the inner wall of the cylinder 691 and one end of the inner wall of the sleeve 692, respectively.

[0059] The change pattern of the connected area is as follows: the initial area is about 20%-30% of the cross-section of the inner wall of the branch pipe 31, and it gradually increases to the maximum area, that is, equal to the cross-section of the inner wall of the branch pipe 31. During this stage, the gas collection hood 2 gradually approaches the fabric surface. Since the gas collection hood 2 has not yet completely covered the area where fly shavings are generated, the increased connected area causes the air intake to gradually increase, so that the fly shavings are sucked in when they begin to be generated but have not yet spread in large quantities, thus achieving advanced capture.

[0060] After the connecting area increases to its maximum, it gradually decreases because the two round holes 64 are staggered again. At this stage, the air collection hood 2 is already quite close to the fabric surface. If a high air intake is maintained, the high-speed airflow may impact the fabric surface. By reducing the connecting area, the air intake and wind speed are reduced to avoid interference with the fabric surface and the drying hot air field.

[0061] The gas collection hood 2 descends to the target position, and the connected area stabilizes at a set value of approximately 60%-70% of the cross-sectional area of ​​the inner wall of the branch pipe 31. The specific value is determined based on the actual fabric width, fly waste generation, and process requirements. At this time, the gas collection hood 2 accurately captures the fly waste generated in the target area with a moderate air intake.

[0062] Once the amount of fly ash generated decreases below the low threshold, the gas collection hood 2 rises and resets. During the rising process, the change in the connected area follows the opposite pattern to the falling process.

[0063] The specific process of the air collection hood 2 descending is as follows: the electric telescopic rod 52 is extended to a certain length by the interactive controller 42. During the extension process, the air collection hood 2 descends and at the same time pulls the second standard spring 693 to extend. After the second standard spring 693 extends, it generates a corresponding pulling force. Part of the pulling force acts in the horizontal direction to push the connector 67 to counteract the elastic force of the first standard spring 68, thereby pushing the connecting rod 63 to move and finally pushing the adjusting plate 62 to move, thereby changing the relative position of the circular holes 64 on the two adjusting plates 62, thus achieving the effect of changing the connected area.

[0064] Example 3: Visual Recognition and Region Localization

[0065] like Figure 2 In this embodiment, the industrial camera of the vision inspection device 41 continuously acquires images of the drying area at a fixed frame rate, preferably 25 to 30 frames per second. Each frame of image covers one or more partitions corresponding to the gas collection hood 2. Taking a drying area with a length of 12 meters as an example, if 6 gas collection hoods are set up, one every 2 meters, the image can be divided into 6 partitions.

[0066] After receiving the image sequence, the interactive controller 42 uses the frame difference method to identify the flying flower region. The specific steps include:

[0067] Step 1: Preprocessing. The current frame image and the previous frame image are converted to grayscale and then subjected to Gaussian filtering for noise reduction to eliminate random noise and minor disturbances caused by the heat wave.

[0068] Step 2: Frame difference calculation. The grayscale image of the current frame is subtracted pixel by pixel from the grayscale image of the previous frame, and the absolute value is taken to obtain the difference image. The area with a larger grayscale value in the difference image is the area where changes have occurred between the two frames, that is, the area where there are moving objects. Since the flying flowers are fluffy materials that are suspended in the air and move, while the background such as the fabric and the inner wall of the oven is stationary for a short time, the frame difference method can effectively separate the flying flowers from the static background.

[0069] Step 3: Morphological processing. An opening operation is performed on the difference image to eliminate isolated noise points while preserving connected, fluffy regions.

[0070] Step 4: Partition Statistics. Divide the processed differential image into several partitions corresponding to each gas collection hood 2 according to the preset partition boundaries. Count the number of pixels in each partition whose gray value exceeds the preset threshold, and calculate the percentage of this number to the total number of pixels in the partition. This is the "flying flower concentration index" of the partition.

[0071] Step 5: Target Area Determination. The fly ash concentration index of each zone is compared with the preset start threshold. When the fly ash concentration index of a certain zone exceeds the start threshold, the zone is determined to be a "fly ash concentrated generation area". The interactive controller 42 generates a control command to drive the corresponding gas collection hood 2 of the zone to descend.

[0072] During the process of identifying flying petals, the interactive controller 42 also calculates the area change rate or aspect ratio of the dynamic movement area to further distinguish flying petals from other dynamic interferences such as water droplets and water mist. Specifically, flying petals are usually long and curled, with a large aspect ratio and irregular shape, while water droplets are usually round or elliptical with an aspect ratio close to 1; water mist is diffuse and has a slow area change rate. By extracting these shape feature parameters, the accuracy of identification can be effectively improved and the false alarm rate can be reduced.

[0073] Example 4: Control Logic

[0074] like Figure 1 and Figure 4 As shown, the specific control logic in the lifting control of the gas collection hood 2 is as follows:

[0075] Step S1: The visual inspection device 41 collects and calculates the pollen concentration index of each zone in real time;

[0076] Step S2: Determine whether the pollen concentration index is greater than the high-level start threshold. If not, continue monitoring; if yes, proceed to step S3.

[0077] Step S3: The interactive controller 42 generates a drive command to extend the electric telescopic rod 52 corresponding to the zone, causing the air collection hood 2 to descend. At the same time, the air volume adjustment mechanism 6 is activated, and the system enters the collection state.

[0078] Step S4: During the descent of the gas collection hood 2, continuously monitor the fly ash concentration index;

[0079] Step S5: Determine whether the pollutant concentration index is lower than the low-level stop threshold. If not, maintain the descent state of the gas collection hood 2 and return to step S4 to continue monitoring; if yes, proceed to step S6.

[0080] Step S6: Start the rise delay timer and set the delay time, preferably 10 seconds to 60 seconds;

[0081] Step S7: During the timing process, continuously monitor the fly ash concentration index and determine whether the fly ash concentration index is higher than the low stop threshold again. If so, it means that fly ash is generated again in a concentrated manner. Then reset the timer, maintain the state of the gas collection hood 2, and return to step S4; otherwise, proceed to step S8.

[0082] Step S8: Determine if the timer has reached the set time. If it has not reached the set time, return to step S7 to continue monitoring; if it has reached the set time, proceed to step S9.

[0083] Step S9: The interactive controller 42 generates an upward command, the air collection hood 2 rises and resets, the linkage air volume adjustment mechanism 6 resets synchronously, and the system returns to standby state.

[0084] Through the above control logic, even if the dust collection hood 2 descends and sucks away the fly ash, causing the visually detected concentration to temporarily decrease, the dust collection hood 2 will not rise immediately. Instead, it will maintain a descending state within a safe time window. This is equivalent to an "over-collection period" to ensure that the most intense dust generation stage of the batch of fabric in this area passes smoothly. Only when the fly ash concentration remains low during this period can it be determined that there is no need for collection in this area, and the dust collection hood 2 can be reset.

[0085] Example 5: Inlet Fan Power Linkage Adjustment

[0086] In this embodiment, when the interactive controller 42 drives any air collection hood 2 to descend, the corresponding connected area of ​​the air collection hood 2 increases, the local resistance decreases, and the air volume allocated to that branch increases. If the air intake fan of the filter device 1 maintains constant power operation and the total air volume remains unchanged, the increase in the air volume of that branch will lead to a decrease in the air volume of other inactive branches, affecting the overall balance of the system.

[0087] To this end, while the interactive controller 42 issues a command to lower the air collection hood, it also sends a power increase command to the air intake fan of the filter device 1, which increases the speed of the air intake fan of the filter device 1 by a preset increment, preferably 5% to 15%. The specific increment is determined according to the number of air collection hoods that are lowered and the change in the connected area. In this way, the total air volume of the system is actively compensated, the activated air collection hood can obtain the expected precise air volume increment, and the air volume of other air collection hoods is not significantly affected, and the system pressure remains stable.

[0088] When the air collection hood rises and resets, the interactive controller 42 synchronously sends a power reduction command to restore the air intake fan of the filter device 1 to the reference operating frequency.

[0089] This linkage adjustment can be expressed in the control logic as: P = P0 + ΣΔPᵢ, where P is the target power of the air intake fan of filter device 1, P0 is the reference power, and ΔPᵢ is the power compensation amount required for the i-th action of the air collection hood.

[0090] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A waste gas purification and fly waste dynamic capture and filtration system for the drying zone of a pulping and finishing machine, characterized in that: It includes a filter device (1) for filtering waste gas containing fly ash and several gas collection hoods (2) installed at equal intervals on the top of the drying area of ​​the pulping unit. Several of the gas collection hoods (2) are connected in parallel to the same main pipe (3) through branch pipes (31). One end of the main pipe (3) is connected to the air inlet of the filter device (1). Each of the aforementioned air collection hoods (2) is equipped with an independent lifting mechanism (5) to drive the air collection hood (2) to move up and down relative to the fabric surface; A linkage air volume adjustment mechanism (6) is provided between the air collection hood (2) and the branch pipe (31). The linkage air volume adjustment mechanism (6) is linked to the lifting and lowering action of the air collection hood (2) to change the communication area between the air collection hood (2) and the branch pipe (31). The system also includes a vision control module (4), which is used to collect image information of the fabric in the drying zone of the pulping machine in real time, identify the target area where fly waste is concentrated, and drive the air collection hood (2) corresponding to the target area to descend according to the target area.

2. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 1, characterized in that: The linkage action is that during the descent of the air collecting hood (2), the connection area between the air collecting hood (2) and the branch pipe (31) changes according to the following rule: the connection area increases first and then decreases as the air collecting hood (2) descends, and when the air collecting hood (2) descends to the target position, the connection area is greater than the connection area at the initial position, so that the air intake of the air collecting hood (2) gradually increases in the early stage of descent to capture the escaped flying flowers, and the air intake decreases in the later stage of descent to avoid the airflow impacting the fabric when the air collecting hood (2) approaches the fabric. After the air collecting hood (2) stops descending, the connection area is fixed to maintain the air intake to accurately capture the flying flowers.

3. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 1, characterized in that: The lifting mechanism (5) includes symmetrically arranged mounting brackets (51). An electric telescopic rod (52) for driving the air collection hood (2) to rise and fall is fixedly connected to one side of the mounting bracket (51). The bottom end of the electric telescopic rod (52) is fixedly connected to the top end of the side wall of the air collection hood (2). A telescopic corrugated pipe (53) is fixedly connected to the top end of the air collection hood (2).

4. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 3, characterized in that: The linkage air volume adjustment mechanism (6) includes a housing (61) fixedly connected to the bottom end of the branch pipe (31), the top end of the mounting bracket (51) fixedly connected to one end of the housing (61), and two vertically distributed adjustment plates (62) slidably connected inside the housing (61). The surface of each adjustment plate (62) has a circular hole (64). The connecting area between the air collection hood (2) and the branch pipe (31) is the area of ​​the two circular holes (64) overlapping vertically. One end of the plate (62) is fixedly connected to a connecting rod (63) for pushing the adjusting plate (62) to move and change the overlapping area of ​​the two circular holes (64). The connecting rod (63) passes through the side wall of the housing (61). A linear bearing is provided at the connection between the connecting rod (63) and the housing (61). The bottom end of the housing (61) is fixedly connected to a connecting pipe (65) that coincides with the branch pipe (31) in the vertical direction. The top end of the telescopic corrugated pipe (53) is fixedly connected to the bottom end of the connecting pipe (65).

5. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 4, characterized in that: Both sides of the housing (61) are fixedly connected to square tubes (66), and a connector (67) is slidably connected inside the square tube (66). One end of the connector (67) is fixedly connected to one end of the corresponding connecting rod (63). A first standard spring (68) is movably sleeved on the outside of the connecting rod (63) to provide a stable thrust to the connector (67). A spring tension member (69) is rotatably connected to the middle of the connector (67).

6. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 5, characterized in that: One end of the elastic pull member (69) is fixedly connected to the top of the gas collection hood (2). The length of the elastic pull member (69) extends and retracts with the rise and fall of the gas collection hood (2) to change the tension of the elastic pull member (69) on the connector (67).

7. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 6, characterized in that: The elastic pull member (69) includes a cylinder (691) rotatably connected inside the connector (67). The bottom end of the square tube (66) is provided with a through groove (671). The cylinder (691) passes through the through groove (671). A sleeve (692) is slidably connected to the outer wall of the cylinder (691). A connecting seat (694) is rotatably connected to one end of the sleeve (692). The connecting seat (694) is fixedly connected to the side wall of the gas collection hood (2). A second standard spring (693) is provided inside the cylinder (691). The two ends of the second standard spring (693) are fixedly connected to one end of the inner wall of the cylinder (691) and one end of the inner wall of the sleeve (692), respectively.

8. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 7, characterized in that: The visual control module (4) includes several visual detection devices (41) for image information acquisition and an interactive controller (42) for information processing. The visual detection devices (41) are signal-connected to the interactive controller (42). The filter device (1) and the electric telescopic rod (52) are both electrically connected to the interactive controller (42). The interactive controller (42) has a built-in control module. The control module generates control commands to drive the air collection hood (2) to rise and fall according to the following logic: Set the high-level start threshold and low-level stop threshold for pollen concentration; When the visual detection device (41) detects that the concentration of fly ash in the target area is higher than the high-level start threshold, it generates a command to drive the electric telescopic rod (52) to extend so as to drive the corresponding gas collection hood (2) to descend. When the concentration of fly ash in the target area is lower than the low-level stop threshold, the rising delay timer is started. If the concentration of fly ash exceeds the low-level stop threshold again during the rising delay timer, the timer is reset and the falling state of the gas collection hood (2) is maintained; An instruction to drive the gas collection hood (2) to rise is generated only after the rise delay timer has ended and the fly ash concentration remains below the low-level stop threshold.

9. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 8, characterized in that: The visual control module (4) uses the frame difference method to identify the target area generated by the concentrated fly flower, including: Perform grayscale difference operations on continuously acquired image frames to extract dynamic motion regions; Calculate the rate of change of the area of ​​the dynamically moving region; When the dynamic pixel density of a certain partition exceeds a preset threshold, the partition is determined to be a region where fly-flowers are concentrated.

10. The waste gas purification and fly waste dynamic collection and filtration system for the drying zone of a pulping and finishing machine according to claim 9, characterized in that: When the vision control module (4) drives any of the air collection hoods (2) to descend, it simultaneously sends a power increase command to the air intake fan of the filter device (1) to compensate for the air volume change of the other air collection hoods (2) caused by the increase in the air intake of the air collection hood (2).

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