Closed slurry filtering equipment

Abstract

The utility model discloses closed slurry filtering equipment, which comprises a box body, a filtering device, a filtering device and a filtering device, wherein the box body is provided with a feeding hole, a liquid discharge hole and a solid discharge hole; the grid bars are horizontally arranged and extend in the first horizontal direction, the grid bars are distributed in the second horizontal direction at intervals, and the second horizontal direction is perpendicular to the first horizontal direction; the liquid outlet is positioned below the grid bars; the solid discharging port and the feeding port are located on the two sides of the grid bars in the first horizontal direction respectively, the solid discharging port is located below the grid bars, and the feeding port is located above the grid bars; the chain is rotationally arranged in the box body and is positioned above the grid bars; the moving direction of the face, facing the grid bars, of the chain is the first horizontal direction from the feeding port to the solid discharging port. The rake tooth plate is fixedly connected to the chain and provided with a plurality of first rake teeth, and the multiple first rake teeth are distributed in the second horizontal direction at intervals; and the first rake teeth can extend into gaps between the adjacent grid bars. The closed slurry filtering equipment provided by the specification is small in filtering resistance, high in filtering efficiency and convenient to mount.

Description

Technical Field

[0001] This specification relates to the technical field of sewage treatment, and in particular to a closed slurry filtration device. Background Art

[0002] In the fields of urban fecal sewage slurry treatment, restaurant kitchen waste slurry treatment, and other organic waste treatment fields or other treatment fields containing mixed slurries, because the sewage slurry contains a large amount of various garbage impurities and other faulty substances, it is usually necessary to pretreat the sewage slurry, that is, to fully filter it to remove various garbage impurities, that is, faulty substances in the slurry, so as to ensure that the operation of the subsequent process treatment stage of the sewage slurry is not interfered with by the garbage faulty substances, and to ensure the normal operation of the treatment system.

[0003] Screens are commonly used for slurry pretreatment. Commonly used screens include tilted rake-tooth screens. These typically require channel-mounted installation and are difficult to install at a high height. They are also inconvenient to install in locations with limited space, difficult to maintain, and difficult to integrate into mobile skid-mounted systems. Furthermore, screens are difficult to seal and operate, making them inefficient for deodorization. Furthermore, tilted screens create high filtration resistance and low filtration efficiency due to the liquid level difference between the front and back of the screen during sewage slurry filtration.

[0004] In summary, the conventional rake grille device has many problems that need to be overcome and solved in the fields of organic waste treatment such as urban fecal sewage slurry treatment, restaurant kitchen waste slurry treatment, or other fields of treatment of impurity slurries. Utility Model Content

[0005] In view of the deficiencies in the prior art, one purpose of this specification is to provide a closed slurry filtration device with low filtration resistance, high filtration efficiency, and easy installation.

[0006] To achieve the above objectives, the embodiments of this specification provide a closed slurry filtration device, comprising:

[0007] A box body, wherein the box body is provided with a feed port, a liquid discharge port and a solid discharge port;

[0008] A plurality of bars fixedly disposed within the housing, the bars being arranged horizontally and extending along a first horizontal direction, the bars being spaced apart in a second horizontal direction, the second horizontal direction being perpendicular to the first horizontal direction; the liquid discharge port being located below the bars; the solid discharge port and the feed port being located on either side of the bars in the first horizontal direction, respectively, with the solid discharge port being located below the bars and the feed port being located above the bars;

[0009] Rotating a chain disposed in the box, the chain being located above the grid; the movement direction of a side of the chain facing the grid is a first horizontal direction from the feed port to the solid discharge port;

[0010] A rake tooth plate is fixedly connected to the chain, and a plurality of first rake teeth are provided at one end of the rake tooth plate away from the chain, and the plurality of first rake teeth are spaced apart in the second horizontal direction; the distance between the chain and the bars is set to allow the first rake teeth to extend into the gaps between adjacent bars.

[0011] As a preferred embodiment, a bracket extending along the second horizontal direction is fixedly provided in the box body, and the grid bars are fixedly connected to the bracket.

[0012] As a preferred embodiment, in the vertical direction, the width of the bars gradually increases from both ends to the middle, or the gap between adjacent bars gradually decreases from both ends to the middle.

[0013] As a preferred embodiment, a driving sprocket and a driven sprocket are spaced apart in the first horizontal direction in the box, and the driving sprocket is connected to a driving member; and the chain is sleeved outside the driving sprocket and the driven sprocket.

[0014] As a preferred embodiment, a slag stopping rake is provided above the discharge port in the box body, and the slag stopping rake is located above the chain. The slag stopping rake is provided with a plurality of second rake teeth on the side facing the chain, and the plurality of second rake teeth are spaced apart in the second horizontal direction; the distance between the slag stopping rake and the chain is set to allow the second rake teeth to extend into the gap between the adjacent first rake teeth.

[0015] As a preferred embodiment, the slag-blocking rake is rotatably connected to the box body at a side away from the chain, and a limiting member for limiting the slag-blocking rake is fixedly provided in the box body so that the slag-blocking rake is tilted toward the chain.

[0016] As a preferred embodiment, the box body is provided with one or more flushing ports, and the flushing ports are located above the bars.

[0017] As a preferred embodiment, the bottom of the box body is provided with two opposite inclined surfaces below the grid bars, the lowest point of the inclined surfaces is aligned with the middle position of the grid bars in the first horizontal direction; the drain port is located at the lowest point.

[0018] As a preferred embodiment, a baffle is provided in the box body at a position corresponding to the feed port, and the baffle has a connected horizontal section and an inclined section, the horizontal section is fixedly connected to the box body, and the inclined section is inclined downward.

[0019] As a preferred embodiment, the closed slurry filtration equipment further includes a plurality of legs for supporting the box body; an odor treatment port is provided on the top surface of the box body, and an inspection port is provided on the side surface of the box body. Beneficial effects

[0020] The closed slurry filtration equipment provided in this embodiment has the following advantages:

[0021] 1. It adopts a box-type structure and does not require channel installation, so it is very convenient to use and install. It is also suitable for system integration installation with other equipment on a skid-mounted structure.

[0022] 2. The fully enclosed box structure is more conducive to preventing odor leakage and is also convenient for equipment operation observation and maintenance.

[0023] 3. The bars are installed horizontally, so the installation height of the equipment can be reduced to a minimum. According to the amount of slurry processed, the lateral size and longitudinal size (i.e. the size of the bars in the first horizontal direction and the size of the bars in the second horizontal direction) of the filtration surface (i.e. the area of ​​the multiple bars) can be flexibly designed without affecting the overall height of the equipment. That is, the filtration area can be increased as needed without changing the height direction, which is highly flexible.

[0024] 4. The bars are installed horizontally, and there is no problem of overcoming the resistance of the liquid level difference between the front and back of the grid when filtering, which is usually encountered in inclined installations. The filtration resistance is small, the filtration speed is fast, and the filtration efficiency is high. It is suitable for the working condition of rapid discharge of the slurry to be filtered at the front end.

[0025] 5. This equipment uses fixed-grid filtration and rake plate batch cleaning, resulting in fewer working parts and more stable operation. The number of rake plates can be flexibly adjusted based on the sewage characteristics, i.e., the amount of slag contained. For high slag loads, the number of rake plates can be increased, while for low slag loads, the number can be reduced.

[0026] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be employed. It should be understood that the scope of the embodiments of the present invention is not limited thereby.

[0027] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0028] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] Figure 1 This is a schematic structural diagram of a closed slurry filtration device provided in this embodiment;

[0031] Figure 2 This is a schematic structural diagram of a grid bar and a bracket provided in this embodiment;

[0032] Figure 3 for Figure 2 A partially enlarged structural schematic diagram;

[0033] Figure 4 Schematic diagram of the structure when the rake teeth plate and the bars on the bracket face each other in this embodiment;

[0034] Figure 5 for Figure 4 The enlarged structural diagram of part A in the middle (for clarity, the rake plate is moved upwards a certain distance, or the grid bars are moved downwards a certain distance);

[0035] Figure 6 A schematic cross-sectional view of a grid bar provided in this embodiment;

[0036] Figure 7 This is an enlarged structural diagram of the rake tooth plate and the slag-blocking rake facing each other in this embodiment (for clarity, the distance between the rake tooth plate and the slag-blocking rake is enlarged).

[0037] Description of reference numerals:

[0038] 1. Box body; 11. Feed inlet; 12. Liquid discharge port; 13. Solid discharge port; 14. Flushing port; 15. Odor treatment port; 16. Inspection port; 17. Inclined surface; 2. Bars; 21. Upper part; 22. Middle part; 23. Lower part; 3. Bracket; 4. Chain; 5. Driving sprocket; 6. Driven sprocket; 7. Support leg; 8. Rake tooth plate; 81. First rake tooth; 9. Slag rake; 91. Second rake tooth; 10. Baffle; 101. Horizontal section; 102. Inclined section; 18. Driving member; 20. Press; X, first horizontal direction; Y, second horizontal direction; Z, vertical direction. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] See also Figures 1 to 7 The embodiment of the present application provides a closed slurry filtering device, comprising: a box 1 , a plurality of bars 2 fixedly disposed in the box 1 , a chain 4 rotatably disposed in the box 1 , and a rake plate 8 fixedly connected to the chain 4 .

[0043] like Figure 1 As shown, the box body 1 adopts a fully enclosed structure, which is more conducive to preventing the leakage of odor and is also convenient for the operation observation and repair and maintenance of the equipment. In addition, the equipment adopts a box body 1 structure, so there is no need for channel installation. Therefore, the use and installation of the equipment is very convenient, and it is also suitable for system integration installation with other equipment on a skid-mounted structure. Specifically, the box body 1 is provided with a feed port 11, a liquid discharge port 12 and a solid discharge port 13. The slurry to be treated (solid-liquid mixture) enters the equipment from the feed port 11, and the liquid flows downward from the gap between the bars 2 and is finally discharged from the liquid discharge port 12; the solids are intercepted by the bars 2, and the rake tooth plate 8 is driven to move by the chain 4, pushing the solids on the bars 2 to the solid discharge port 13 for discharge.

[0044] like Figure 1 、 Figure 2 and Figure 3As shown, the bars 2 are arranged horizontally and extend along a first horizontal direction X, and a plurality of the bars 2 are spaced apart in a second horizontal direction Y. The second horizontal direction Y is perpendicular to the first horizontal direction X, and both are perpendicular to the vertical direction Z. The liquid discharge port 12 is located below the bars 2. The solid discharge port 13 and the feed port 11 are respectively located on both sides of the bars 2 in the first horizontal direction X, with the solid discharge port 13 located below the bars 2 and the feed port 11 located above the bars 2.

[0045] The horizontal installation of the bars 2 minimizes the installation height of the device. Furthermore, the lateral and longitudinal dimensions of the filtration surface (i.e., the area of ​​the multiple bars 2) (i.e., the dimensions of the bars 2 in the first horizontal direction X and the second horizontal direction Y) can be flexibly designed based on the amount of slurry being processed, without affecting the overall height of the device. This allows for increased filtration area as needed without changing the height, resulting in greater flexibility. The horizontal installation of the bars 2 eliminates the resistance of the liquid level difference between the front and rear of the bars, as is typically the case with tilted grates. This results in low filtration resistance, fast filtration speed, and high filtration efficiency, making it suitable for applications requiring rapid discharge of slurry from the front end.

[0046] like Figure 1 As shown, the chain 4 is located above the grid 2. The moving direction of the chain 4 facing the grid 2 is the first horizontal direction X from the feed port 11 to the discharge port 13, that is, Figure 1 In the figure, the chain 4 at the bottom moves from left to right.

[0047] The end of the rake plate 8 away from the chain 4 is provided with a plurality of first rake teeth 81, and the plurality of first rake teeth 81 are distributed at intervals in the second horizontal direction Y. Figure 4 As shown, the distance between the chain 4 and the bars 2 is set to allow the first rake teeth 81 to extend into the gaps between the adjacent bars 2, so that when the chain 4 drives the rake tooth plate 8 to move from left to right, the first rake teeth 81 can push the solids on and between the bars 2 toward the solid discharge port 13, and finally discharge them from the solid discharge port 13.

[0048] This closed slurry filtration equipment uses fixed bars 2 for filtration and rake plates 8 for batch slag removal, resulting in fewer working parts and more stable operation. The number of rake plates 8 can be flexibly adjusted based on the sewage characteristics, i.e., the amount of slag contained. When the slag amount is large, the number of rake plates 8 can be increased, while when the slag amount is small, the number of rake plates 8 can be reduced.

[0049] In this embodiment, if Figures 1 to 3As shown, a bracket 3 extending along the second horizontal direction Y is fixedly provided in the box body 1, and the grid bar 2 is fixedly connected to the bracket 3. The number of the brackets 3 is preferably three, and in the first horizontal direction X, two brackets 3 are close to the ends of the grid bar 2, and one bracket 3 is close to the middle position of the grid bar 2.

[0050] like Figure 5 and Figure 6 As shown, in the vertical direction Z, the width of the bars 2 gradually increases from the two ends to the middle, or the gap between adjacent bars 2 gradually decreases from the two ends to the middle. In other words, the cross section of the bars 2 is roughly diamond-shaped. The width in this embodiment refers to the dimension in the second horizontal direction Y.

[0051] In a preferred embodiment, Figure 6 As shown, the cross section of the grid bar 2 includes an upper portion 21 whose width gradually increases from top to bottom, a middle portion 22 whose width remains constant, and a lower portion 23 whose width gradually decreases from top to bottom. Figure 6 The dotted lines in FIG. 2 are for illustration only and have no practical significance. The upper portion 21 and the lower portion 23 are symmetrically arranged about the middle portion 22 .

[0052] In a specific embodiment, the top width of the upper portion 21 (i.e., the bottom width of the lower portion 23) can be 3 mm, and the width of the middle portion 22 can be 5 mm. The height of the middle portion 22 can be 4 mm, and the heights of both the upper and lower portions 21, 23 can be 8 mm. In this embodiment, the height refers to the dimension in the vertical direction Z. Of course, the specific dimensions of the bars 2 can be appropriately set according to filtering needs, and this application does not impose a single limitation on the dimensions of the bars 2.

[0053] In this embodiment, regarding the gaps between adjacent bars 2, the gaps between the upper parts 21 are roughly in the shape of a positive V, and the gaps between the lower parts 23 are roughly in the shape of an inverted V. The filtered liquid flows down through the positive V-shaped gap and the inverted V-shaped gap in turn, which can speed up the flow rate of the filtered liquid, so that the bar 2 network formed by the combination of the bars 2 has a large flow rate and smaller filtration resistance, and faulty materials such as stones are not easily stuck in the gaps of the bars 2, so the slag cleaning resistance is small, thereby ensuring the efficient operation of the equipment.

[0054] In this embodiment, in order to ensure that the first rake teeth 81 inserted into the gaps between the bars 2 have sufficient thickness to ensure the strength of the first rake teeth 81 and enable the first rake teeth 81 to remove slag smoothly, the spacing between adjacent bars 2 is set to at least 5 mm.

[0055] like Figure 1As shown, a drive sprocket 5 and a driven sprocket 6 are spaced apart within the housing 1 in the first horizontal direction X. The drive sprocket 5 is connected to a drive member 18. The chain 4 is sleeved around the drive sprocket 5 and the driven sprocket 6. The drive member 18 drives the drive sprocket 5 to rotate counterclockwise, thereby rotating the chain 4 and rotating the driven sprocket 6 counterclockwise. The chain 4 drives the rake teeth 8 to move, clearing solids from the bars 2 from left to right to the solid discharge port 13.

[0056] Preferably, a slag-blocking rake 9 is provided above the discharge port 13 in the box body 1, and the slag-blocking rake 9 is located above the chain 4. Figure 7 As shown, the slag-blocking rake 9 is provided with a plurality of second rake teeth 91 on a side facing the chain 4 , and the plurality of second rake teeth 91 are spaced apart in the second horizontal direction Y. The distance between the slag-blocking rake 9 and the chain 4 is set to allow the second rake teeth 91 to extend into the gaps between adjacent first rake teeth 81 , thereby efficiently cleaning the residual grating residue on the rake plate 8 .

[0057] Specifically, driven by the driving sprocket 5, when the rake plate 8 rotates counterclockwise with the chain 4 to above the discharge port 13, the second rake teeth 91 arranged above can extend into the gap of the first rake teeth 81, so that the residual grating residue on the rake plate 8 can be efficiently cleaned.

[0058] like Figure 1 As shown, the side of the slag-blocking rake 9 away from the chain 4 is rotatably connected to the box body 1. Specifically, the two ends of the slag-blocking rake 9 along the second horizontal direction Y on the side away from the chain 4 are rotatably connected to the box body 1. A limiting member (not shown) for limiting the position of the slag-blocking rake 9 is fixedly provided in the box body 1, so that the slag-blocking rake 9 is tilted toward the chain 4. There are two limiting members, one is located below the connection between the slag-blocking rake 9 and the box body 1, and the other is located above the connection between the slag-blocking rake 9 and the box body 1. The slag-blocking rake 9 can rotate between the two limiting members. The movable slag-blocking rake 9 can be used to perform reverse slag cleaning on the first rake teeth 81, so that the first rake teeth 81 remain clean.

[0059] In this embodiment, the box body 1 is provided with one or more flushing ports 14, and the flushing ports 14 are located above the bars 2. The number of flushing ports 14 can be set as needed, and the flushing surface is large, which can ensure efficient cleaning of the retained filter residue, so that the organic matter content of the discharged residue is lower and the sanitation level is higher.

[0060] like Figure 1As shown, the bottom of the box body 1 is provided with two opposing inclined surfaces 17 below the bars 2. The lowest point of the inclined surfaces 17 is aligned with the middle position of the bars 2 in the first horizontal direction X, so that the liquid filtered by the bars 2 can be more easily collected and discharged. The drain port 12 is located at the lowest point.

[0061] Specifically, a baffle 10 is provided in the box body 1 at a position corresponding to the feed port 11 for preventing impact. The baffle 10 comprises a connected horizontal section 101 and an inclined section 102. The horizontal section 101 is fixedly connected to the box body 1, and the inclined section 102 is inclined downward.

[0062] like Figure 1 As shown, the closed slurry filtration device further comprises a plurality of legs 7 for supporting the box body 1. The top surface of the box body 1 is provided with an odor treatment port 15, and the side surface of the box body 1 is provided with an inspection port 16.

[0063] exist Figure 1 In the figure, multiple arrows are used to indicate the flow direction of the material. The arrow outside the feed port 11 represents the solid-liquid mixed slurry to be treated, the arrow below the grid 2 represents the filtered liquid, and the arrow above the grid 2 represents the solid. Figure 5 and Figure 7 In the figure, for clarity, the distance between the rake plate 8 and the grid bar 2 / slag harrow 9 is enlarged. In actual operation, the first rake teeth 81 and the grid bar 2 / second rake teeth 91 are engaged. The solids discharged from the solid discharge port 13 can be sent to the press 20 for subsequent processing.

[0064] It should be noted that, in the description of this specification, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be understood to indicate or imply relative importance. Furthermore, in the description of this specification, unless otherwise specified, "plurality" means two or more.

[0065] Any numerical value cited herein includes all values ​​of the lower and upper values ​​in increments of one unit from the lower value to the upper value, provided that there is at least a two-unit interval between any lower value and any higher value. For example, if the value of a component quantity or process variable (e.g., temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are also explicitly listed in this specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples intended to be clearly stated, and it is to be understood that all possible combinations of the values ​​listed between the minimum and maximum values ​​are explicitly stated in this specification in a similar manner.

[0066] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. When used with a range, "about" or "approximately" applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the specified endpoints.

[0067] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." when describing a combination should include the identified elements, ingredients, components, or steps and other elements, ingredients, components, or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may," it is intended to indicate that any attribute described as "may" be optional.

[0068] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0069] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the inventors did not consider such subject matter to be part of the disclosed utility model subject matter.

Claims

1. A closed slurry filtration device, characterized in that: include: A box body, wherein the box body is provided with a feed port, a liquid discharge port and a solid discharge port; A plurality of bars fixedly disposed within the housing, the bars being arranged horizontally and extending along a first horizontal direction, the bars being spaced apart in a second horizontal direction, the second horizontal direction being perpendicular to the first horizontal direction; the liquid discharge port being located below the bars; the solid discharge port and the feed port being located on either side of the bars in the first horizontal direction, respectively, with the solid discharge port being located below the bars and the feed port being located above the bars; Rotating a chain disposed in the box, the chain being located above the grid; the movement direction of a side of the chain facing the grid is a first horizontal direction from the feed port to the solid discharge port; A rake tooth plate is fixedly connected to the chain, and a plurality of first rake teeth are provided at one end of the rake tooth plate away from the chain, and the plurality of first rake teeth are spaced apart in the second horizontal direction; the distance between the chain and the bars is set to allow the first rake teeth to extend into the gaps between adjacent bars.

2. The closed slurry filtration equipment according to claim 1, characterized in that: A bracket extending along the second horizontal direction is fixedly provided in the box body, and the grid bars are fixedly connected to the bracket.

3. The closed slurry filtration equipment according to claim 1, characterized in that: In the vertical direction, the width of the bars gradually increases from the two ends to the middle, or the gap between adjacent bars gradually decreases from the two ends to the middle.

4. The closed slurry filtration equipment according to claim 1, characterized in that: A driving sprocket and a driven sprocket are spaced apart in the first horizontal direction within the box body, wherein the driving sprocket is connected to a driving member; and the chain is sleeved outside the driving sprocket and the driven sprocket.

5. The closed slurry filtration equipment according to claim 1, characterized in that: A slag stopping rake is provided in the box body above the discharge port, and the slag stopping rake is located above the chain. A plurality of second rake teeth are provided on a side of the slag stopping rake facing the chain, and the plurality of second rake teeth are spaced apart in the second horizontal direction; the distance between the slag stopping rake and the chain is set to allow the second rake teeth to extend into the gap between adjacent first rake teeth.

6. The closed slurry filtration equipment according to claim 5, characterized in that: The side of the slag-blocking rake away from the chain is rotatably connected to the box body, and a limiting member for limiting the position of the slag-blocking rake is fixedly provided in the box body, so that the slag-blocking rake is tilted toward the chain.

7. The closed slurry filtration equipment according to claim 1, characterized in that: The box body is provided with one or more flushing ports, and the flushing ports are located above the bars.

8. The closed slurry filtration equipment according to claim 1, characterized in that: The bottom of the box body is provided with two opposite inclined surfaces below the grid bars, the lowest point of the inclined surfaces is aligned with the middle position of the grid bars in the first horizontal direction; the drain port is located at the lowest point.

9. The closed slurry filtration equipment according to claim 1, characterized in that: A baffle is provided at a position corresponding to the feed port in the box body. The baffle has a connected horizontal section and an inclined section. The horizontal section is fixedly connected to the box body, and the inclined section is inclined downward.

10. The closed slurry filtration device according to claim 1, characterized in that: The closed slurry filtering equipment further comprises a plurality of legs for supporting the box body; the top surface of the box body is provided with an odor treatment port, and the side surface of the box body is provided with an inspection port.

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