Wastewater pretreatment device

Abstract

The utility model provides a wastewater pretreatment device, and belongs to the technical field of wastewater treatment. The device comprises a solid-liquid separation unit and a deslagging unit, the solid-liquid separation unit comprises a shell as well as a filtering structure, a cleaning structure and a collecting hopper which are respectively mounted on the shell, the filtering structure comprises one of a grating and a screen, and the cleaning structure is configured to clean solid pollutants intercepted by the filtering structure to the collecting hopper; the slag discharging unit comprises a slag discharging pipeline and a spiral conveying assembly, a slag discharging inlet of the slag discharging pipeline is communicated with a slag outlet of the collecting hopper, and the spiral conveying assembly is rotatably installed in the slag discharging pipeline; the spiral conveying assembly comprises shaftless spiral conveying blades distributed at intervals in the axial direction of the slag discharging pipeline and connecting shafts for connecting every two adjacent sections of shaftless spiral conveying blades. A cutting blade is arranged on the inner wall of the deslagging pipeline, corresponds to the connecting shaft and is provided with a cutting part facing the upstream of the deslagging pipeline. The wastewater pretreatment device can solve the problem that the deslagging pipeline is easy to block.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a wastewater pretreatment device. Background Art

[0002] In the wastewater treatment process, it is usually necessary to first use physical treatment methods to remove solid pollutants in the wastewater. Among them, screen machines are widely used in physical treatment, and solid pollutants are intercepted by screens to ensure the normal operation of subsequent treatment facilities. In wastewater treatment, screen machines usually have too many solid pollutants in the sewage and are entangled on the bars, which can easily cause blockage, thereby affecting the treatment efficiency. In some processes, a pretreatment device is added upstream of the screen machine to remove larger, easily entangled solid pollutants in advance to reduce the burden on the screen machine. However, in the pretreatment device, since a large number of larger, easily entangled solid pollutants are intercepted, in the process of discharging slag, the larger, easily entangled solid pollutants can easily cause the slag discharge pipe to be blocked. Utility Model Content

[0003] The purpose of this application is to provide a wastewater pretreatment device that can improve the problem of easy blockage of slag discharge pipes.

[0004] The embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application provides a wastewater pretreatment device, comprising a solid-liquid separation unit and a slag discharge unit;

[0006] The solid-liquid separation unit includes a housing and a filtering structure, a cleaning structure and a collection hopper respectively mounted on the housing, wherein the filtering structure includes one of a grid and a screen, and the cleaning structure is configured to clean the solid pollutants intercepted by the filtering structure into the collection hopper;

[0007] The slag discharge unit includes a slag discharge pipe and a screw conveying assembly. The slag discharge inlet of the slag discharge pipe is connected to the slag discharge port of the collecting hopper in the solid-liquid separation unit. The screw conveying assembly is rotatably installed in the slag discharge pipe.

[0008] The spiral conveying assembly includes shaftless spiral conveying blades and a connecting shaft distributed along the axial direction of the slag discharge pipe. The shaftless spiral conveying blades are distributed at intervals along the axial direction of the slag discharge pipe, and two adjacent sections of shaftless spiral conveying blades are connected by a connecting shaft.

[0009] The inner wall of the slag discharge pipe is provided with a cutting blade, the cutting blade corresponds to the connecting shaft, and the cutting blade has a cutting portion facing the upstream of the slag discharge pipe.

[0010] In some embodiments, the screw conveying assembly further includes a conical protrusion matching the connecting shaft, and a bottom surface of the conical protrusion is connected to an end surface of the connecting shaft.

[0011] In some embodiments, the cutting blade is parallel to the axial direction of the slag discharge pipe, and the cutting portion is arc-shaped and protrudes toward the upstream of the slag discharge pipe.

[0012] In some embodiments, in the radial direction of the slag discharge pipe, the size of the cutting blade is D1, the distance between the outer edge of the shaftless spiral conveying blade and the inner wall of the slag discharge pipe is D2, and D1>D2.

[0013] In some embodiments, the inner wall of the slag discharge pipe is provided with one or more groups of cutting blades, each group of cutting blades contains multiple cutting blades, the multiple cutting blades in each group of cutting blades are distributed at intervals along the circumference of the slag discharge pipe, and the multiple groups of cutting blades are distributed at intervals along the axial direction of the slag discharge pipe.

[0014] In some embodiments, the inner wall of the slag discharge pipe is provided with multiple groups of cutting blades, and two connected groups of cutting blades are staggered in the circumferential direction of the slag discharge pipe.

[0015] In some embodiments, the spiral conveying assembly further includes a cutting blade connected to a side wall of the connecting shaft, and the cutting blade is perpendicular to the axial direction of the slag discharge pipe.

[0016] In some embodiments, the cutting blades and the cutting blades are staggered in the axial direction of the slag discharge pipe.

[0017] In some embodiments, in the radial direction of the slag discharge pipe, the size of the cutting blade is D3, the distance between the cutting blade and the connecting shaft is D4, and D3>D4.

[0018] In some embodiments, the spiral conveying assembly includes one or more groups of cutting blades, each group of cutting blades contains multiple cutting blades, the multiple cutting blades in each group of cutting blades are distributed at intervals along the circumference of the connecting shaft, and the multiple groups of cutting blades are distributed at intervals along the axial direction of the connecting shaft.

[0019] The wastewater pretreatment device provided in the embodiment of the present application has the following beneficial effects:

[0020] A spiral conveying assembly is set in the slag discharge pipe, and the slag is discharged by spiral conveying. The spiral conveying blades can push the material efficiently. The spiral conveying blades can also stir and break up the waste slag, reducing the risk of waste slag accumulation and effectively improving the blockage problem.

[0021] In the spiral conveying assembly, a shaftless spiral conveying blade is provided, and the central axis of the spiral conveying blade is eliminated, which effectively avoids the entanglement of strip-shaped waste slag and can further improve the blockage problem. This design can also increase the waste slag circulation space and improve the waste slag conveying efficiency. Among them, the shaftless spiral conveying blades are distributed at intervals, and two adjacent sections of shaftless spiral conveying blades are connected by a connecting shaft, which can improve the overall structural strength of the spiral conveying assembly; at the same time, a cutting blade corresponding to the connecting shaft is provided on the inner wall of the slag discharge pipe, and the cutting portion of the cutting blade is configured toward the upstream of the slag discharge pipe. The waste slag is cut by the cutting blade, which first increases the objects for breaking up the waste slag and can improve the breaking up of the waste slag. At the same time, the cutting direction of the cutting blade on the waste slag is opposite to the waste slag conveying direction, which can well cut off large particles and easily entangled waste slag, and can better improve the blockage problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic structural diagram of a wastewater pretreatment device provided in an embodiment of the present application;

[0024] Figure 2 A schematic structural diagram of a slag discharge unit provided in an embodiment of the present application from a first perspective;

[0025] Figure 3 A schematic structural diagram of a slag discharge unit provided in an embodiment of the present application at a second viewing angle;

[0026] Figure 4 A schematic structural diagram of a spiral conveying assembly provided in an embodiment of the present application;

[0027] Figure 5 A schematic structural diagram of a slag discharge pipe provided in an embodiment of the present application from a first perspective;

[0028] Figure 6 A structural schematic diagram of a slag discharge pipe from a second perspective provided in an embodiment of the present application.

[0029] icon:

[0030] 100-wastewater pretreatment device;

[0031] 110-solid-liquid separation unit; 111-slag outlet;

[0032] 120-slag discharge unit; 121-slag discharge pipe; 1211-slag discharge inlet; 1212-slag discharge outlet; 1213-cutting blade; 12131-cutting part; 122-screw conveying assembly; 1221-shaftless spiral conveying blade; 1222-connecting shaft; 1223-connecting disk; 1224-conical protrusion; 1225-cutting blade; 123-rotating motor. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this application, it should be noted that the terms "center", "up", "down", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0037] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0038] Furthermore, the terms “vertical”, “parallel”, etc. do not mean that the components are required to be absolutely vertical or parallel, but may be slightly tilted.

[0039] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] The technical solution of this application will be exemplarily described below through some embodiments.

[0041] See also Figure 1 , an embodiment of the present application provides a wastewater pretreatment device 100 , including a solid-liquid separation unit 110 and a slag discharge unit 120 .

[0042] The solid-liquid separation unit 110 includes a shell and a filtering structure, a cleaning structure and a collecting hopper respectively installed on the shell. The filtering structure includes one of a grid and a screen. The cleaning structure is used to clean the solid pollutants intercepted by the filtering structure into the collecting hopper.

[0043] The filter structure may be a grid, exemplified by a coarse grid with a grid gap width of 20 mm to 100 mm, for removing larger, easily entangled solid contaminants. The cleaning structure may be conventionally configured, such as, but not limited to, rake teeth that match the bars of the grid.

[0044] In the present application, the configuration form of the solid-liquid separation unit 110 can be conventionally selected, for example, but not limited to, the solid-liquid separation form of the equipment configured as an arm screen machine, chain screen machine, steel rope screen machine, rotary screen machine, drum screen machine, etc.

[0045] See also Figure 2 and Figure 3 The slag discharge unit 120 includes a slag discharge pipe 121 and a screw conveying assembly 122 . The screw conveying assembly 122 is rotatably installed in the slag discharge pipe 121 .

[0046] In this application, a spiral conveying assembly 122 is set in the slag discharge pipe 121, and the slag is discharged by spiral conveying. The spiral conveying blades can push the material efficiently, and the spiral conveying blades can also stir and break up the waste slag, reducing the risk of waste slag accumulation and effectively improving the blockage problem.

[0047] The slag discharge pipe 121 can be conventionally designed to have a slag discharge inlet 1211 and a slag discharge outlet 1212 at both ends. The slag discharge inlet 1211 and the slag discharge outlet 1212 are exemplarily provided on the side wall of the slag discharge pipe 121 to better match the spiral conveying assembly 122 .

[0048] The slag discharge inlet 1211 of the slag discharge pipe 121 is connected to the slag outlet 111 of the solid-liquid separation unit 110. The end where the slag discharge inlet 1211 is located is the feed end of the slag discharge pipe 121, that is, the upstream of the slag discharge pipe 121; the end where the slag discharge outlet 1212 is located is the discharge end of the slag discharge pipe 121, that is, the downstream of the slag discharge pipe 121.

[0049] It can be understood that the spiral conveying assembly 122 can be rotatably installed in the slag discharge pipe 121 in a conventional manner, for example, by being rotatably connected to the slag discharge pipe 121 at both ends in the axial direction; correspondingly, the slag discharge unit 120 is fixedly connected to the rotating motor 123 on the outer wall of one end of the slag discharge pipe 121, and is connected to the end of the spiral conveying assembly 122 through the rotating motor 123, thereby driving the spiral conveying assembly 122 to rotate in the slag discharge pipe 121.

[0050] The spiral conveying assembly 122 includes shaftless spiral conveying blades 1221 and a connecting shaft 1222 distributed along the axial direction of the slag discharge pipe 121. The shaftless spiral conveying blades 1221 are distributed at intervals along the axial direction of the slag discharge pipe 121, and two adjacent sections of shaftless spiral conveying blades 1221 are connected by the connecting shaft 1222.

[0051] In the present application, the shaftless spiral conveying blade 1221 and the connecting shaft 1222 are connected by welding, for example. When one or both ends of the spiral conveying assembly 122 are shaftless spiral conveying blades 1221, the shaftless spiral conveying blades 1221 are connected to the rotating motor 123 by, for example but not limited to, a flange, a coupling, etc.

[0052] Exemplarily, the screw conveying assembly 122 further includes connecting discs 1223 located at both ends of the axial direction. The connecting discs 1223 are connected to the shaftless screw conveying blade 1221 by welding or other means. At one end of the screw conveying assembly 122, the screw conveying assembly 122 is rotatably connected to the slag discharge pipe 121 via the connecting disc 1223. At the other end of the screw conveying assembly 122, the screw conveying assembly 122 is rigidly connected to the output flange of the rotating motor 123 via the connecting disc 1223, and the connection is achieved, for example, by bolting.

[0053] A cutting blade 1213 is provided on the inner wall of the slag discharge pipe 121 . The cutting blade 1213 corresponds to the connecting shaft 1222 . The cutting blade 1213 has a cutting portion 12131 facing upstream of the slag discharge pipe 121 .

[0054] The wastewater pretreatment device 100 provided in the present application is provided with a shaftless spiral conveying blade 1221 in the spiral conveying component 122, which eliminates the central axis of the spiral conveying blade, effectively avoids the entanglement of strip-shaped waste residue, and can further improve the blockage problem. This design can also increase the waste residue circulation space and improve the waste residue conveying efficiency.

[0055] Among them, the shaftless spiral conveying blades 1221 are distributed at intervals, and two adjacent sections of the shaftless spiral conveying blades 1221 are connected by a connecting shaft 1222, which can improve the overall structural strength of the spiral conveying assembly 122; at the same time, a cutting blade 1213 corresponding to the connecting shaft 1222 is set on the inner wall of the slag discharge pipe 121, and a cutting part 12131 facing upstream of the slag discharge pipe 121 is configured on the cutting blade 1213. The waste slag is cut by the cutting blade 1213. First, the objects for breaking up the waste slag are increased, which can improve the breaking up of the waste slag. At the same time, the cutting direction of the waste slag by the cutting blade 1213 is opposite to the waste slag conveying direction, which can well cut off large particles and easily entangled waste slag, and can better improve the blockage problem of the slag discharge pipe 121.

[0056] See also Figure 4 In some embodiments, the spiral conveying assembly 122 further includes a conical protrusion 1224 that matches the connecting shaft 1222 , and the bottom surface of the conical protrusion 1224 is connected to the end surface of the connecting shaft 1222 .

[0057] Among them, the conical protrusion 1224 refers to a conical protrusion, and the bottom surface of the conical protrusion 1224 is the bottom surface of the cone; the conical protrusion 1224 matches the connecting shaft 1222, which means that the bottom surface of the conical protrusion 1224 and the end surface of the connecting shaft 1222 are basically the same in size and shape, and the two are basically aligned. The conical protrusion 1224 and the connecting shaft 1222 are exemplarily formed as one piece.

[0058] In the above design, a conical protrusion 1224 is connected to the end face of the connecting shaft 1222. The conical protrusion 1224 can guide the waste residue to both sides, thereby reducing the accumulation of waste residue at the connection between the connecting shaft 1222 and the shaftless spiral conveying blade 1221, and playing a better anti-blocking role.

[0059] See also Figure 5 In some embodiments, the cutting blade 1213 is parallel to the axial direction of the slag discharge pipe 121, that is, the two side surfaces of the cutting blade 1213 are parallel to the axial direction of the slag discharge pipe 121. The cutting portion 12131 is arc-shaped and protrudes toward the upstream of the slag discharge pipe 121. For example, the distance from the arc-shaped cutting portion 12131 to the upstream of the slag discharge pipe 121 gradually increases from the end close to the inner wall of the slag discharge pipe 121 to the end close to the connecting shaft 1222.

[0060] In the above design, the cutting blade 1213 is positioned at a suitable angle, effectively cutting the waste in the direction opposite to the waste conveying direction. The arc-shaped cutting portion 12131 provides a better cutting effect and a longer cutting surface. Based on this, the cutting blade 1213 can effectively cut through large particles and easily entangled waste, which can effectively reduce the clogging problem.

[0061] For example, in the radial direction of the slag discharge pipe 121 , the size of the cutting blade 1213 is D1 , the distance between the outer edge of the shaftless spiral conveying blade 1221 and the inner wall of the slag discharge pipe 121 is D2 , and D1 > D2 .

[0062] That is to say, in the cross section perpendicular to the axis of the slag discharge pipe 121, in the radial direction of the slag discharge pipe 121, the cutting blade 1213 and the shaftless spiral conveying blade 1221 can partially overlap. Based on this design, the cutting blade 1213 has a larger cutting range, and the cutting blade 1213 can better cooperate with the shaftless spiral conveying blade 1221, which is conducive to the cutting blade 1213 to better cut the waste slag.

[0063] See also Figure 5 and Figure 6 Optionally, the inner wall of the slag discharge pipe 121 is provided with one or more groups of cutting blades 1213. Each group of cutting blades 1213 contains multiple cutting blades 1213, and the multiple cutting blades 1213 in each group of cutting blades 1213 are distributed at intervals along the circumference of the slag discharge pipe 121.

[0064] When a plurality of groups of cutting blades 1213 are provided on the inner wall of the slag discharge pipe 121 , the plurality of groups of cutting blades 1213 are distributed at intervals along the axial direction of the slag discharge pipe 121 .

[0065] Furthermore, the inner wall of the slag discharge pipe 121 is provided with multiple groups of cutting blades 1213; in the circumferential direction of the slag discharge pipe 121, two connected groups of cutting blades 1213 are staggered, such as Figure 6 As shown, the structures of the two groups of cutting blades 1213 can be exactly the same, and the two groups of cutting blades 1213 are used to highlight the staggered distribution state with different filling styles. Based on this, in the cross section perpendicular to the axis of the slag discharge pipe 121, the two groups of cutting blades 1213 do not overlap.

[0066] In this design, the cutting blades 1213 are configured into multiple groups distributed in an interlaced manner, and all the cutting blades 1213 cooperate to achieve a better cutting effect as a whole.

[0067] See also Figure 4 The spiral conveying assembly 122 also includes a cutting blade 1225, which is connected to the side wall of the connecting shaft 1222; the cutting blade 1225 is perpendicular to the axial direction of the slag discharge pipe 121, that is, the two side surfaces of the cutting blade 1213 are perpendicular to the axial direction of the slag discharge pipe 121.

[0068] The cutting blade 1225 refers to a blade having a cutting edge, which may be, for example but not limited to, a propeller-shaped blade, a leaf-shaped blade, etc. The cutting blade 1225 is exemplarily connected to the side of the connecting shaft 1222 by welding.

[0069] In the above design, the cutting blade 1225 is connected to the side of the connecting shaft 1222. When the spiral conveying assembly 122 rotates, the connecting shaft 1222 drives the cutting blade 1225 to rotate. The cutting blade 1225 can cut the waste slag close to the side of the connecting shaft 1222. First, the cutting object of the waste slag is increased, and the cutting direction of the cutting blade 1225 is perpendicular to the cutting direction of the cutting blade 1213. The cutting blade 1225 and the cutting blade 1213 cooperate to better cut off large particles and easily entangled waste slag; moreover, the cutting blade 1225 cuts on the surface of the connecting shaft 1222, and the cutting direction is perpendicular to the waste slag conveying direction, which can reduce the entanglement of the waste slag on the connecting shaft 1222.

[0070] See also Figure 2 and Figure 3 Optionally, in the axial direction of the slag discharge pipe 121, the cutting blades 1225 and the cutting blades 1213 are staggered so that the two can better cooperate in cutting.

[0071] For example, in some embodiments, in the radial direction of the slag discharge pipe 121 , the size of the cutting blade 1225 is D3, the distance between the cutting blade 1213 and the connecting shaft 1222 is D4, and D3>D4.

[0072] That is to say, in the cross section perpendicular to the axis of the slag discharge pipe 121, in the radial direction of the slag discharge pipe 121, the cutting blade 1213 and the cutting blade 1225 can partially overlap. Based on this design, the cutting blade 1225 has a larger cutting range, and the cutting blade 1225 can better cooperate with the cutting blade 1213, which is conducive to the cutting blade 1213 to better cut the waste slag.

[0073] As an example, the spiral conveying assembly 122 includes one or more groups of cutting blades 1225 , each group of cutting blades 1225 includes a plurality of cutting blades 1225 , and the plurality of cutting blades 1225 in each group of cutting blades 1225 are distributed at intervals along the circumference of the connecting shaft 1222 .

[0074] When the spiral conveying assembly 122 includes multiple groups of cutting blades 1225 , the multiple groups of cutting blades 1225 are distributed at intervals along the axial direction of the connecting shaft 1222 .

[0075] It is understandable that when the spiral conveying assembly 122 includes multiple groups of cutting blades 1225, in the circumferential direction of the slag discharge pipe 121, two adjacent groups of cutting blades 1225 can be arranged in an overlapping and aligned manner, or can be distributed in a staggered manner.

[0076] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A wastewater pretreatment device, characterized in that: The wastewater pretreatment device includes a solid-liquid separation unit and a slag discharge unit; The solid-liquid separation unit includes a housing and a filtering structure, a cleaning structure and a collecting hopper respectively mounted on the housing, wherein the filtering structure includes one of a grid and a screen, and the cleaning structure is used to clean the solid pollutants intercepted by the filtering structure into the collecting hopper; The slag discharge unit includes a slag discharge pipe and a screw conveying assembly, the slag discharge inlet of the slag discharge pipe is connected to the slag discharge port of the collecting hopper in the solid-liquid separation unit, and the screw conveying assembly is rotatably installed in the slag discharge pipe; The spiral conveying assembly includes shaftless spiral conveying blades and a connecting shaft distributed along the axial direction of the slag discharge pipe. The shaftless spiral conveying blades are distributed at intervals along the axial direction of the slag discharge pipe, and two adjacent sections of the shaftless spiral conveying blades are connected by the connecting shaft. A cutting blade is provided on the inner wall of the slag discharge pipe. The cutting blade corresponds to the connecting shaft and has a cutting portion facing upstream of the slag discharge pipe.

2. The wastewater pretreatment device according to claim 1, characterized in that: The spiral conveying assembly further includes a conical protrusion matched with the connecting shaft, and the bottom surface of the conical protrusion is connected to the end surface of the connecting shaft.

3. The wastewater pretreatment device according to claim 1, characterized in that: The cutting blade is parallel to the axial direction of the slag discharge pipe, and the cutting portion is arc-shaped and protrudes toward the upstream of the slag discharge pipe.

4. The wastewater pretreatment device according to claim 1, characterized in that: In the radial direction of the slag discharge pipe, the size of the cutting blade is D1, the distance between the outer edge of the shaftless spiral conveying blade and the inner wall of the slag discharge pipe is D2, and D1>D2.

5. The wastewater pretreatment device according to claim 1, characterized in that: The inner wall of the slag discharge pipe is provided with one or more groups of cutting blades, each group of cutting blades contains multiple cutting blades, the multiple cutting blades in each group of cutting blades are distributed at intervals along the circumference of the slag discharge pipe, and multiple groups of cutting blades are distributed at intervals along the axial direction of the slag discharge pipe.

6. The wastewater pretreatment device according to claim 5, characterized in that: The inner wall of the slag discharge pipe is provided with a plurality of groups of cutting blades, and two connected groups of cutting blades are staggeredly distributed in the circumferential direction of the slag discharge pipe.

7. The wastewater pretreatment device according to claim 1, characterized in that: The spiral conveying assembly further includes a cutting blade connected to the side wall of the connecting shaft, and the cutting blade is perpendicular to the axial direction of the slag discharge pipe.

8. The wastewater pretreatment device according to claim 7, characterized in that: In the axial direction of the slag discharge pipe, the cutting blades and the cutting blades are staggered.

9. The wastewater pretreatment device according to claim 8, characterized in that: In the radial direction of the slag discharge pipe, the size of the cutting blade is D3, the distance between the cutting blade and the connecting shaft is D4, and D3>D4.

10. The wastewater pretreatment device according to any one of claims 7 to 9, characterized in that: The spiral conveying assembly includes one or more groups of cutting blades, each group of cutting blades contains multiple cutting blades, the multiple cutting blades in each group of cutting blades are distributed at intervals along the circumference of the connecting shaft, and multiple groups of cutting blades are distributed at intervals along the axial direction of the connecting shaft.

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