An automatically adjustable oil mist exhaust device and method

Abstract

The application provides an automatically adjustable oil mist exhaust device and method, comprising mixing cavities arranged on both sides of a rolling mill respectively, the mixing cavities are provided with exhaust ports, the mixing cavities arranged on both sides of the rolling mill are connected with a same fan through the exhaust ports, the same fan can control the suction of oil mist on both sides of the rolling mill relatively evenly; a flow guide bottom plate is arranged at the bottom of the mixing cavity, the flow guide bottom plate is a reverse V-shaped structure, the flow guide bottom plate and the inner wall of the mixing cavity are spaced apart to form at least two air inlets, the reverse V-shaped structure facilitates the gathering of oil mist to the air inlets, and after the condensation of oil mist, the condensed oil mist is facilitated to be recycled under the action of gravity; a flow guide inclined plate is arranged on the side wall of the mixing cavity close to the rolling mill, the flow guide inclined plate facilitates the recycling of the condensed oil mist under the action of gravity, a spoiler extending inward is arranged at the bottom of the mixing cavity, the spoiler can increase the length of the movement path of oil mist, and also can change the movement direction of oil mist, so that the oil mist forms a local air vortex after entering the mixing cavity, and the oil mist removal efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil mist exhaust, in particular to an automatic adjustable oil mist exhaust device and method. BACKGROUND

[0002] Aluminum is an important non-ferrous metal processing raw material, widely used in the fields of aviation, chips and transportation. The oil mist particles generated in the aluminum rolling process are currently widely existing gaseous pollutants in non-ferrous metal processing plants. The oil mist particles dispersed into the plant environment can enter the human body through the respiratory tract and skin exposure, which seriously endangers the health of workers. At the same time, the condensed oil mist droplets falling on the processed metal strip will also affect the quality of the finished strip.

[0003] At present, the aluminum rolling plant widely uses ring suction type oil mist exhaust hood to control the oil mist particles emitted during rolling. The ring suction exhaust technology is widely used in the kitchen fume field, and its basic idea is to install a rectifier plate at the bottom of the exhaust hood to form a circle of air ports around the exhaust hood. However, due to the large difference between the kitchen fume control field and the rolling oil mist control source, and because the rolling oil mist presents a non-steady state change rule in different periods, the design of the constant air volume exhaust system cannot meet the requirements of good control of pollutants and the lowest system energy consumption. SUMMARY

[0004] In order to solve the problems in the prior art, the application provides an automatic adjustable oil mist exhaust device and method to solve the technical problem that the oil mist generated in the aluminum processing process cannot be quickly and efficiently exhausted in the prior art.

[0005] To achieve the above purpose, the application provides the following technical scheme:

[0006] An automatic adjustable oil mist exhaust device, comprising mixing cavities respectively arranged on both sides of a rolling mill, wherein the mixing cavities are provided with exhaust ports, and the mixing cavities respectively arranged on both sides of the rolling mill are connected with the same fan through the exhaust ports.

[0007] The bottom of the mixing cavity is provided with a flow guide bottom plate, the flow guide bottom plate is a reverse V-shaped structure, and the flow guide bottom plate and the inner wall of the mixing cavity are spaced apart to form at least two air ports.

[0008] The side wall of the mixing cavity away from the rolling mill is provided with a flow guide inclined plate, and the bottom of the mixing cavity is provided with an inwardly extending spoiler.

[0009] Further, the reverse V-shaped structure comprises a first baffle and a second baffle, adjacent sides of the first baffle and the second baffle are provided with the same fixed shaft, and the fixed shaft can be rotatably penetrated through the mixing cavity.

[0010] The fixed shaft is provided with a limiting block near one end of the rolling mill, and a driving device is drivingly connected to the other end of the fixed shaft.

[0011] Further, the driving device is arranged outside the mixing chamber.

[0012] The fixed shaft is provided with a driving nut fixedly arranged at the end away from the rolling mill, the driving device comprises a driving motor and a driving screw rod arranged at the output end of the driving motor, and the driving nut is threadedly sleeved on the driving screw rod.

[0013] Further, a Z-direction baffle is sealingly and fixedly connected to the upper side of the flow guide bottom plate, the top of the Z-direction baffle is arranged in spaced relation with the top of the mixing chamber, the side wall of the Z-direction baffle abuts against the inner wall of the mixing chamber, and the Z-direction baffle divides the air outlet into two areas.

[0014] Further, the Z-direction baffle divides the air outlet into two areas of different sizes, and the area of the divided area near the rolling mill is less than or equal to the area of the divided area away from the rolling mill.

[0015] Further, an X-direction baffle is sealingly and fixedly connected to the upper side of the flow guide bottom plate, the top of the X-direction baffle is arranged in spaced relation with the bottom of the flow guide inclined plate, the side wall of the X-direction baffle abuts against the inner wall of the mixing chamber, and the X-direction baffle is provided with two flow guide openings.

[0016] Further, the area of the flow guide opening near the rolling mill is less than or equal to the area of the flow guide opening away from the rolling mill.

[0017] Further, the X-direction baffle is inserted into the Z-direction baffle, the top of the X-direction baffle is arranged in spaced relation with the bottom of the flow guide inclined plate, the side wall of the X-direction baffle abuts against the inner wall of the mixing chamber, and the X-direction baffle is provided with two flow guide openings.

[0018] Further, the area of the flow guide opening near the rolling mill is less than or equal to the area of the flow guide opening away from the rolling mill, the Z-direction baffle divides the air outlet into two areas of different sizes, and the area of the divided area near the rolling mill is less than or equal to the area of the divided area away from the rolling mill.

[0019] A method for automatically adjusting an oil mist air exhaust device, comprising the following steps:

[0020] The fan simultaneously sucks air through the air outlet to the mixing chambers located on both sides of the rolling mill;

[0021] The air outlet area forms a low-pressure area, and the oil mist in the area around the flow guide bottom plate is sucked;

[0022] When the oil mist converges to the low-pressure area around the flow guide bottom plate, part of the oil mist enters the mixing chamber from the air outlet, and another part of the oil mist converges into the air outlet through the flow guide bottom plate and then enters the mixing chamber.

[0023] Compared with the prior art, the present application has the following beneficial technical effects:

[0024] The present application provides an automatic adjustable oil mist exhaust device and method, comprising a mixing chamber arranged on each side of the rolling mill, the mixing chamber is provided with an exhaust port, and the mixing chambers arranged on each side of the rolling mill are connected with the same fan through the exhaust port, and the same fan can control the suction of oil mist on both sides of the rolling mill relatively evenly; the bottom of the mixing chamber is provided with a flow guide bottom plate, the flow guide bottom plate is a inverted V-shaped structure, and the flow guide bottom plate and the inner wall of the mixing chamber are spaced apart to form at least two air inlets, the inverted V-shaped structure can guide the flow of oil mist, facilitate the convergence of oil mist to the air inlet, and facilitate the recovery of condensed oil mist under the action of gravity after the oil mist condenses; the side wall of the mixing chamber close to the rolling mill is provided with a flow guide inclined plate, the flow guide inclined plate is used to adapt to the structure of the rolling mill, so that the mixing chamber can be as close to the rolling mill as possible, facilitating the collection of oil mist, and facilitating the recovery of condensed oil mist under the action of gravity; the bottom of the mixing chamber is provided with an inwardly extending spoiler, the spoiler can increase the length of the oil mist movement path, and also change the direction of the oil mist movement, so that the oil mist forms an air vortex after entering the mixing chamber, the air vortex can quickly collect the oil mist, and can also increase the airflow velocity in the mixing chamber, improving the oil mist removal efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic diagram of an automatic adjustable oil mist exhaust device for the embodiment of the present disclosure;

[0026] Figure 2 It is a structure schematic diagram of an automatic adjustable oil mist exhaust device provided with a Z-direction baffle for the embodiment of the present disclosure;

[0027] Figure 3 It is a structure schematic diagram of an automatic adjustable oil mist exhaust device provided with an X-direction baffle for the embodiment of the present disclosure;

[0028] Figure 4 It is a structure schematic diagram of an automatic adjustable oil mist exhaust device provided with a Z-direction baffle and an X-direction baffle for the embodiment of the present disclosure;

[0029] Figure 5 It is a front view of the mixing chamber provided with a driving assembly for the embodiment of the present disclosure;

[0030] Figure 6 It is a side view of the mixing chamber provided with a driving assembly for the embodiment of the present disclosure.

[0031] In the drawings: 1, air inlet; 2, guide inclined plate; 3, first baffle; 4, second baffle; 5, guide bottom plate; 6, mixing cavity; 7, air outlet; 70, limiting block; 71, fixed shaft; 72, driving motor; 73, transmission nut; 8, Z-direction baffle; 9, X-direction baffle; 90, guide opening; 10, spoiler. DETAILED DESCRIPTION

[0032] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0033] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0037] It should be understood that the terms "comprises" and "comprising" when used in this specification and the following claims, indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0038] It should also be understood that the terms used in the present application specification are only for the purpose of describing particular embodiments and are not intended to limit the present application. As used in the present application specification and the following claims, unless otherwise clearly indicated by the context, the singular forms "a," "an," and "the" are intended to include the plural forms as well.

[0039] It should be further understood that the term "and / or" used in the present application specification and the following claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0040] Various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These diagrams are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and some details may be omitted. The shapes and relative sizes of the various regions, layers, and their relative positions illustrated in the drawings are merely exemplary, and in actuality may deviate due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes, and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0041] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0042] The disclosed embodiments provide an automatically adjustable oil mist exhaust device, as shown in Figure 1 The mixed chambers 6 respectively arranged on both sides of the rolling mill are connected with the same fan through the exhaust ports 7.

[0043] The bottom of the mixing cavity 6 is provided with a flow guide bottom plate 5, the flow guide bottom plate 5 is a reverse V-shaped structure, and the flow guide bottom plate 5 is spaced apart from the inner wall of the mixing cavity 6 to form at least two air outlets 1;

[0044] The side wall of the mixing cavity 6 close to the rolling mill is provided with a flow guide inclined plate 2, and the bottom of the mixing cavity 6 is provided with an inwardly extending spoiler 10.

[0045] Preferably, in the embodiment of the present disclosure, the reverse V-shaped structure comprises a first baffle 3 and a second baffle 4, adjacent sides of the first baffle 3 and the second baffle 4 are provided with the same fixed shaft 71, and the fixed shaft 71 can be rotatably connected through the mixing cavity 6;

[0046] One end of the fixed shaft 71 close to the rolling mill is provided with a limiting block 70, and the other end of the fixed shaft 71 away from the rolling mill is drivingly connected with a driving device;

[0047] Further, the driving device is arranged outside the mixing cavity 6;

[0048] The other end of the fixed shaft 71 away from the rolling mill is fixedly provided with a transmission nut 73, the driving device comprises a driving motor 72 and a transmission screw 74 arranged at the output end of the driving motor 72, and the transmission nut 73 is threadedly sleeved on the shaft body of the transmission screw 74;

[0049] Specifically, the driving motor 72 drives the transmission screw 74 to rotate, and the transmission screw 74 rotates relative to the transmission nut 73, so that the transmission nut 73 moves axially upward or downward along the transmission screw 74, and then drives the fixed shaft 71 to move upward or downward relative to the mixing cavity 6; in some embodiments, the mixing cavity 6 is provided with a vertical guide groove, and the width of the guide groove is at least greater than the diameter of the fixed shaft 71.

[0050] Preferably, in the embodiment of the present disclosure, Figure 2 Another structure schematic diagram of an automatically adjustable oil mist exhaust device is shown, as shown in Figure 2 As shown, the upper side of the flow guide bottom plate 5 is sealingly and fixedly connected with a Z-direction baffle 8, the top of the Z-direction baffle 8 is spaced apart from the top of the mixing cavity 6, the side wall of the Z-direction baffle 8 abuts the inner wall of the mixing cavity 6, and the Z-direction baffle 8 divides the exhaust port 7 into two areas; specifically, the Z-direction baffle 8 is a cross-connection of the flow guide bottom plate 5; it should be noted that the bottom of the Z-direction baffle 8 is provided with a reverse V-shaped structure matched with the structure of the flow guide bottom plate 5, and the Z-direction baffle 8 and the flow guide bottom plate 5 are connected by welding or screws.

[0051] Furthermore, the Z-direction baffle 8 divides the exhaust port 7 into two areas of different sizes, and the area of ​​the divided area on the side away from the rolling mill is less than or equal to the area of ​​the divided area on the side close to the rolling mill, so that the area away from the rolling mill has a larger cavity, forming a greater negative pressure acting on the side away from the rolling mill. This is because generally speaking, the closer to the rolling mill, the emitted oil mist is below the control area of ​​the exhaust hood, and the farther away from the rolling mill, the greater the amount of oil mist emitted from the surface of the coil exposed to the outside, and the more difficult it is to control. A larger cavity volume can generate a greater negative pressure, and the greater negative pressure can collect the oil mist in this area as much as possible.

[0052] Preferably, in the embodiment of the present disclosure, Figure 3 Another automatic adjustable oil mist exhaust device structure diagram is shown in FIG. Figure 3 As shown, the upper side of the guide bottom plate 5 is sealed and fixedly connected to an X-direction baffle 9, the top of the X-direction baffle 9 is spaced apart from the bottom of the guide inclined plate 2, the side wall of the X-direction baffle 9 abuts the inner wall of the mixing chamber 6, and the X-direction baffle 9 is penetrated by two guide ports 90;

[0053] Furthermore, the area of ​​the guide port 90 close to the rolling mill is less than or equal to the area of ​​the guide port 90 away from the rolling mill, so that the area away from the rolling mill has a higher flow rate, forming a larger negative pressure acting on the side close to the rolling mill. This is because generally speaking, the farther away from the rolling mill side, the greater the amount of oil mist emitted from the surface of the coil exposed to the outside, and the more difficult it is to control. Therefore, designs with different guide port areas can provide local negative pressure appropriately. That is to say, the larger the area of ​​the guide port 90, the more flow can be guaranteed, thereby creating a larger negative pressure, and the larger local negative pressure can collect the oil mist in this area as much as possible into the exhaust hood.

[0054] Preferably, in the embodiment of the present disclosure, Figure 4 Another automatic adjustable oil mist exhaust device structure diagram is shown in FIG. Figure 4 As shown, the Z-direction baffle 8 is plugged into the X-direction baffle 9, the top of the X-direction baffle 9 is spaced apart from the bottom of the guide ramp 2, the side wall of the X-direction baffle 9 abuts the inner wall of the mixing chamber 6, and the X-direction baffle 9 is penetrated by two guide ports 90; specifically, in some embodiments, the Z-direction baffle 8 and / or the X-direction baffle 9 are provided with a plug-in snap-in groove, and the Z-direction baffle 8 and the X-direction baffle 9 are connected through the snap-in groove. After they are connected through the snap-in groove, some limiting structures can also be provided to make them fixedly connected at a vertical angle to improve their structural strength and stability.

[0055] Furthermore, the area of ​​the guide port 90 near the rolling mill is smaller than or equal to the area of ​​the guide port 90 far from the rolling mill. The Z-direction baffle 8 divides the exhaust port 7 into two areas of unequal size, and the area of ​​the divided area near the rolling mill is smaller than or equal to the area of ​​the divided area far from the rolling mill. Specifically, the division by the Z-direction baffle 8 and the X-direction baffle 9 forms four cavities within the mixing chamber 6. These four cavities ensure the directional removal of oil mist from the exhaust ports 7 at different locations. Based on the principle of static pressure box diversion, the area of ​​the guide port 90 is adjusted to achieve orderly distribution of airflow within the mixing chamber, greatly reducing airflow interference between the two areas without increasing the overall resistance of the exhaust hood.

[0056] At the same time, it should be noted that in some embodiments of the combined cavity 6 formed in conjunction with a driving device and containing a Z-direction baffle 8 and / or an X-direction baffle 9, it should be noted that the distance between the top of the Z-direction baffle 8 and the X-direction baffle 9 and the top of the combined cavity 6 should be greater than or equal to the moving distance of the driving device.

[0057] The present invention also provides a method for automatically adjusting the oil mist exhaust device, comprising the following steps:

[0058] The fan simultaneously draws air through the exhaust port 7 into the mixing chamber 6 located on both sides of the rolling mill;

[0059] A low-pressure area is formed in the air outlet 1 area, which absorbs the oil mist located in the area around the guide bottom plate 5;

[0060] When the oil mist converges to the negative pressure area around the guide bottom plate 5 , part of the oil mist enters the mixing chamber 6 from the air outlet 1 , and the other part of the oil mist is guided by the guide bottom plate 5 into the air outlet 1 and then into the mixing chamber 6 .

[0061] It should be noted that during the oil mist extraction process, by pre-collecting an image of the oil mist generated during the operation of the rolling mill, the relative positions of the Z-direction baffle 8 and the X-direction baffle 9, as well as the sizes of the exhaust port 7 and the air outlet 1 are specifically set. The size of the air outlet 1 is adjusted based on the transmission device, and the size of the guide port 90 is also included. This achieves targeted extraction of the oil mist. Specifically, this process is based on a method for processing oil mist images in industrial building interiors and includes the following steps:

[0062] Collect visual information of oil mist particles in the target area and determine video frames in the visual information;

[0063] Describing the background of each pixel in the video frame based on a mixed Gaussian background model, and separating a first dynamically changing area and a first static area based on the background of each pixel;

[0064] Using morphological methods to enhance the oil mist image features in the first dynamic change area;

[0065] The morphological method is used to enhance the image features of the first dynamic region, the wavelet analysis method is used to extract the energy features of the enhanced first dynamic region, a threshold is set based on the energy features, the second dynamic region is determined through the threshold determination, and the second dynamic region is taken as the oil mist region.

[0066] Further, the process of describing the background of each pixel in the video frame is:

[0067] The observation value of the pixel point is taken as a random variable, and the probability distribution of the random variable is composed of a plurality of Gaussian distributions, which represents the typical value of the pixel at different time periods.

[0068] The mixed Gaussian background model assumes that the observation value of each pixel is I, and the probability distribution of a single sample It can be represented as:

[0069]

[0070] Wherein, K is the number of Gaussian distributions, the higher the value of K, the better the system describes the complex environment; ω kt is the weight of the kth Gaussian distribution in time, which is used to reflect the importance of the Gaussian distribution in the model, and all the weights add up to 1; η is the probability density function of the Gaussian distribution, which is defined as:

[0071]

[0072] According to the size of the weight coefficient or the ratio of the weight coefficient ω kt to the standard deviation σ, all Gaussian components are sorted to determine the importance and order of the Gaussian components in the model, and the Gaussian distribution is divided into a first dynamic change region and a first static region.

[0073] When describing the background, a number of Gaussian distributions whose weight cumulative values first exceed a certain preset threshold T are selected as a first static region set, and the remaining Gaussian distributions are classified as a first dynamic change region set; the first static region set is sorted by the cumulative weight of the Gaussian distribution, and if the cumulative value exceeds the set threshold T, it is taken as the boundary between the first dynamic change region and the first static region.

[0074] The background formula is represented as:

[0075]

[0076] Wherein, B is the number of Gaussian distributions representing the background.

[0077] Further, the process of separating the first dynamic change region and the first static region based on the background of each pixel point is:

[0078] The mixed Gaussian background model comprises K Gaussian distributions, each of which has a mean vector μ kt and a standard deviation σ.

[0079] The mixed Gaussian background model calculates the distance between the observation value I t and the mean value μ kt of each Gaussian distribution based on the arrangement order of the K Gaussian distributions, and matches the observation value I t with one of the Gaussian distributions.

[0080] The matching principle is that when the distance of the Kth Gaussian distribution first satisfies λ times of the standard deviation λσ of the distribution, the Gaussian distribution is matched with the observation value I t ; the observation value I t is any pixel point in a video frame.

[0081] The matching function M kt of the pixel point is assigned a value of 1 if the matching is successful, otherwise the matching function remains 0, indicating that the matching fails.

[0082] If the matching is successful, the pixel point is regarded as a first static region, otherwise the pixel point is regarded as a first dynamic change region.

[0083] Further, the mixed Gaussian background model is used to adapt to background changes by learning and updating the parameters of each Gaussian distribution.

[0084] The parameters of the Gaussian distribution include weight, mean value and variance.

[0085] The rule for the mixed Gaussian background model to learn and update the parameters of each Gaussian distribution is:

[0086] At time t, if no Gaussian distribution is matched with the observation value I t , the mixed Gaussian background model introduces a new Gaussian distribution, the mean value of the new Gaussian distribution is set as the current observation value I t , a large initial variance and a small weight are set, and the existing distribution with the lowest weight is removed.

[0087] If the observation value I t is matched with a specific Gaussian distribution, the mixed Gaussian background model updates the weight, mean value and variance according to formula (5).

[0088]

[0089] In the formula, ω kt+1 is the updated weight coefficient of the kth Gaussian distribution at time t+1; α is the learning rate, and the value range is 0<α<1; M ktAn indicator function representing a match success, 1 when the match is successful, otherwise 0; μ kt+1 is the updated mean of the kth Gaussian distribution at t+1; ρ kT is the adaptive learning rate, representing the influence of the observation value I t on the update of the mean of the Gaussian distribution; is the probability density function of the Gaussian distribution, calculating the probability of the observation value I t on the kth Gaussian distribution; is the updated variance of the kth Gaussian distribution at t+1.

[0090] Further, the morphological method includes dilation, erosion, opening operation and closing operation method.

[0091] Further, the process of extracting the energy features of the enhanced first dynamic region using wavelet analysis method is:

[0092] The enhanced first dynamic region is decomposed in one direction to produce two subbands: low-frequency subband L and high-frequency subband H;

[0093] The wavelet analysis method is based on two-dimensional wavelet transform, which decomposes the image by applying low-pass and high-pass filters to produce four different subbands: low-frequency information subgraph LL1, horizontal high-frequency edge subgraph HL1, vertical high-frequency edge subgraph LH1 and diagonal high-frequency edge subgraph HH1;

[0094] The two-dimensional wavelet transform is:

[0095]

[0096] where, represents a two-dimensional scaling function with separation, derived from a one-dimensional scaling function At the same time ψ 1 (x,y), ψ 2 (x,y), ψ 3 (x,y) as a separable two-dimensional wavelet function with "directional perception" characteristics, respectively corresponding to the horizontal edge of the image in the column direction, the vertical edge in the row direction, and the change of the edge gray scale in the diagonal direction, is the representation of a one-dimensional wavelet function;

[0097] The energy value of the high-frequency subband H is calculated to extract the features related to the second dynamic change region;

[0098] The energy value is calculated by summing the squares of all pixel values in the subband, and the specific calculation formula is:

[0099] ENergy = |LH| 2 + |HL|2 +|HH| 2

[0100] The process of determining the second dynamic region by threshold determination is:

[0101] Suppose ENergy represents the energy value of the image to be detected at position (x1, y1), and B(x1, y1) represents the high-frequency component energy value of the first static change region image at the corresponding position after two-dimensional discrete wavelet transform. If the energy value of the image to be detected is lower than the energy value of the first static region, it is determined that the image block at this position is a second dynamic change region.

[0102] The condition for determining whether the second dynamic change region exists is:

[0103] T1×B(x1, y1)<E(x1, y1)<T2×B(x1, y1) (10)

[0104] If the energy value of the image block to be detected is between T1 times and T2 times the high-frequency component energy value at the corresponding position of the background image, it is considered that the image block is a second dynamic change region, and this region is marked as an oil mist region.

[0105] The process of processing the collected oil mist escape image based on the image processing algorithm to obtain the actual oil mist area is:

[0106] The contour of the second dynamic change region obtained by the oil mist processing algorithm is extracted, and the width of the circumscribed rectangle of each contour is calculated. The contour detection and width calculation formula is:

[0107] W i =x max -x min

[0108] Where W i is the width of the i-th contour, x max and x min are the maximum and minimum coordinate values of the contour in the x direction, respectively.

[0109] The maximum circumscribed rectangle width in all contours is selected as the maximum width of the smoke, and the maximum width calculation formula is:

[0110] W smoke =max{W i}

[0111] Where W smoke is the maximum width of the detected smoke.

[0112] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the exact details shown above and described herein, and obvious modifications will occur to those skilled in the art upon reading the foregoing description. Therefore, the scope of the application is not to be determined by the specific examples shown above, but only by the claims below. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0113] Furthermore, it should be understood that although the description above relates to embodiments, not every embodiment contains only one independent technical solution, and the description above is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical idea of the present application, which is within the scope of the technical solutions, falls within the protection scope of the claims of the present application.

Claims

1. An automatically adjustable oil mist exhaust device, characterized by, Including respectively setting in the mixing cavity (6) of rolling mill two sides, The mixing cavity (6) is provided with exhaust port (7), The mixing cavity (6) of respectively setting in rolling mill two sides is connected with same fan through exhaust port (7); The bottom of the mixing cavity (6) is provided with a flow guide bottom plate (5), the flow guide bottom plate (5) is a inverted V-shaped structure, the flow guide bottom plate (5) and the inner wall of the mixing cavity (6) are spaced apart to form at least two air outlets (1); The side wall of the mixing cavity (6) away from the rolling mill is provided with a flow guide inclined plate (2), the bottom of the mixing cavity (6) is provided with an inwardly extending spoiler (10), the inverted V-shaped structure includes a first baffle (3) and a second baffle (4), the adjacent side of the first baffle (3) and the second baffle (4) is provided with a same fixed shaft (71), the fixed shaft (71) can be rotatably connected through the mixing cavity (6); The end of the fixed shaft (71) close to the rolling mill is provided with a limiting block (70), the end of the fixed shaft (71) away from the rolling mill is drivingly connected with a driving device, the upper side of the flow guide bottom plate (5) is sealingly and fixedly connected with a Z-direction baffle (8), the top of the Z-direction baffle (8) is spaced apart from the top of the mixing cavity (6), the side wall of the Z-direction baffle (8) abuts against the inner wall of the mixing cavity (6), and the Z-direction baffle (8) divides the exhaust port (7) into two areas.

2. The automatically adjustable oil mist exhaust device of claim 1, wherein, The driving device is arranged outside the mixing cavity (6); The end of the fixed shaft (71) away from the rolling mill is fixedly provided with a transmission nut (73), the driving device includes a driving motor (72) and a transmission screw rod (74) arranged at the output end of the driving motor (72), and the transmission nut (73) is threadedly sleeved on the rod body of the transmission screw rod (74).

3. The automatically adjustable oil mist exhaust device of claim 1, wherein, The Z-direction baffle (8) divides the exhaust port (7) into two areas of different sizes, and the area of the partition area close to the rolling mill is less than or equal to the area of the partition area away from the rolling mill.

4. The automatically adjustable oil mist exhaust device of claim 1, wherein, The Z-direction baffle (8) is inserted with an X-direction baffle (9), the top of the X-direction baffle (9) is spaced apart from the bottom of the flow guide inclined plate (2), the side wall of the X-direction baffle (9) abuts against the inner wall of the mixing cavity (6), and the X-direction baffle (9) is provided with two flow guide openings (90).

5. An automatically adjustable oil mist exhaust device according to claim 4, wherein The area of the flow guide opening (90) close to the rolling mill is less than or equal to the area of the flow guide opening (90) away from the rolling mill, the Z-direction baffle (8) divides the exhaust port (7) into two areas of different sizes, and the area of the partition area close to the rolling mill is less than or equal to the area of the partition area away from the rolling mill.

6. An automatically adjustable oil mist exhaust device, characterized by, Including respectively setting in the mixing cavity (6) of rolling mill two sides, The mixing cavity (6) is provided with exhaust port (7), The mixing cavity (6) of respectively setting in rolling mill two sides is connected with same fan through exhaust port (7); The bottom of the mixing cavity (6) is provided with a flow guide bottom plate (5), the flow guide bottom plate (5) is a inverted V-shaped structure, the flow guide bottom plate (5) and the inner wall of the mixing cavity (6) are spaced apart to form at least two air outlets (1); The side wall of the mixing cavity (6) away from the rolling mill is provided with a flow guide inclined plate (2), the bottom of the mixing cavity (6) is provided with an inwardly extending spoiler (10), the inverted V-shaped structure comprises a first baffle (3) and a second baffle (4), the adjacent sides of the first baffle (3) and the second baffle (4) are provided with the same fixed shaft (71), and the fixed shaft (71) can be rotatably connected through the mixing cavity (6); The end of the fixed shaft (71) close to the rolling mill is provided with a limiting block (70), the end of the fixed shaft (71) away from the rolling mill is drivingly connected with a driving device, the upper side of the flow guide bottom plate (5) is sealingly and fixedly connected with an X-direction baffle (9), the top of the X-direction baffle (9) is spaced apart from the bottom of the flow guide inclined plate (2), the side wall of the X-direction baffle (9) abuts against the inner wall of the mixing cavity (6), and the X-direction baffle (9) is provided with two flow guide openings (90).

7. An automatically adjustable oil mist exhaust device according to claim 6, wherein The area of the flow guide opening (90) close to the rolling mill is less than or equal to the area of the flow guide opening (90) away from the rolling mill.

8. A method of using an automatically adjustable oil mist exhaust device, comprising: The automatic adjustable oil mist exhaust device based on any one of claims 1-7 comprises the following steps: The fan simultaneously sucks air through the exhaust opening (7) to the mixing cavities (6) located on both sides of the rolling mill; The area of the flow guide opening (90) close to the rolling mill is less than or equal to the area of the flow guide opening (90) away from the rolling mill. The fan simultaneously sucks air through the exhaust opening (7) to the mixing cavities (6) located on both sides of the rolling mill; The area of the flow guide opening (90) close to the rolling mill is less than or equal to the area of the flow guide opening (90) away from the rolling mill.

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