Efficient defluorination, dechlorination and denitrification treatment device and method for aluminum ash

Abstract

The invention relates to the technical field of aluminum ash slag treatment, and discloses an efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag and a method thereof.The efficient defluorination, dechlorination and denitrification treatment device for the aluminum ash slag comprises a treatment device body, a screening mechanism, a blockage clearing mechanism and a driving mechanism; the defluorination tank body, the dechlorination tank body and the denitrification tank body are arranged above the fixing plate at intervals, and the crushing assembly is arranged above the fixing plate and located on one side of the defluorination tank body. According to the device, the blockage clearing mechanism and the driving mechanism are arranged, full-automatic operation of the blockage clearing mechanism can be provided through the driving mechanism, manual operation by personnel cannot be achieved, when the blockage clearing mechanism conducts blockage clearing on the screening plate, part of holes of the screening plate can be cleared in each batch, and the blockage clearing efficiency is improved in the clearing process. The residual unblocked holes in the screening plate can still screen the aluminum ash slag at the same time, and it is ensured that in the blockage cleaning process, it is avoided that too much aluminum ash slag is accumulated on the screening plate, and consequently the screening efficiency is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum ash residue treatment, and particularly to a device and method for efficiently removing fluorine, chlorine, and nitrogen from aluminum ash residue. Background Art

[0002] Aluminum ash residue is a waste generated during the production process of the aluminum industry, which contains a certain amount of fluorine, chlorine, and nitrogen elements. The emission of these harmful elements not only pollutes the environment but also may pose a hazard to human health. Therefore, it is of great significance to carry out defluorination, dechlorination, and denitrification treatment on aluminum ash residue.

[0003] The aluminum ash residue is crushed and screened for subsequent treatment. For defluorination treatment: the pretreated aluminum ash residue is mixed with an appropriate amount of calcium salt, stirred evenly, and then a precipitation reaction is carried out. After the reaction ends, calcium fluoride precipitate and defluorinated aluminum ash residue are obtained by filtration; for dechlorination treatment: the defluorinated aluminum ash residue is subjected to high-temperature roasting or chloride reduction treatment to convert the chlorine element into a gas or a low-toxic substance. After the treatment ends, dechlorinated aluminum ash residue is obtained; for denitrification treatment: the dechlorinated aluminum ash residue is treated by biological denitrification or chemical reduction method. The biological denitrification method converts nitrogen elements into nitrogen gas through the metabolic action of microorganisms; the chemical reduction method uses a reducing agent to reduce nitrogen elements into nitrogen gas or other harmless substances. After the above steps are completed with efficient treatment, denitrified aluminum ash residue is obtained, and the defluorinated, dechlorinated, and denitrified aluminum ash residue is subjected to resource utilization or safe landfill treatment.

[0004] During the process of crushing and screening aluminum ash residue in the early stage, the screening mesh is vibrated by a vibration motor to provide smooth passage of the aluminum ash residue. During the screening of aluminum ash residue, due to the size difference of the aluminum ash residue, it is easy for the aluminum ash residue to get stuck in the mesh holes of the screening mesh. At this time, the blocked mesh holes prevent the aluminum ash residue from being quickly discharged, resulting in an increase in the time for the pre-treatment of aluminum ash residue and a reduction in the overall efficiency of subsequent defluorination, dechlorination, and denitrification. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for efficiently removing fluorine, chlorine, and nitrogen from aluminum ash residue to solve the problem proposed in the above background art that during the screening of aluminum ash residue, due to the size difference of the aluminum ash residue, it is easy for the aluminum ash residue to get stuck in the mesh holes of the screening mesh. At this time, the blocked mesh holes prevent the aluminum ash residue from being quickly discharged, resulting in an increase in the time for the pre-treatment of aluminum ash residue and a reduction in the overall efficiency of subsequent defluorination, dechlorination, and denitrification.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag, comprising: a treatment device main body, a screening mechanism, a clogging clearing mechanism and a driving mechanism. The treatment device main body consists of a fixing plate, a defluorination tank body, a dechlorination tank body and a denitrification tank body which are arranged at intervals above the fixing plate, and a crushing assembly arranged on one side of the defluorination tank body above the fixing plate. The screening mechanism is arranged at the discharge port at the bottom of the crushing assembly. The screening mechanism includes a screening plate arranged at the discharge port at the bottom of the crushing assembly and a vibration motor fixed at one end of the bottom of the screening plate. The clogging clearing mechanism is arranged at the bottom of the screening plate. The number of the clogging clearing mechanisms is three. The clogging clearing mechanism includes guide rods welded on both sides of the bottom of the screening plate, mounting blocks vertically slidably connected to the guide rods, clogging clearing rods welded on the tops of the mounting blocks, and connecting rods welded on the outer walls of the mounting blocks. The driving mechanism is arranged on the outer wall of the screening plate.

[0008] By adopting the above technical scheme, it can quickly clean the blocked screening plate, thereby improving the treatment efficiency of aluminum ash slag.

[0009] Preferably, the driving mechanism includes a fixing block welded on the outer wall of the screening plate and a groove opened above the fixing block.

[0010] By adopting the above technical scheme, it can enable the internal structure to move horizontally inside the groove.

[0011] Preferably, the driving mechanism further includes a driving motor fixed on the outer wall of the fixing block and a threaded rod arranged at the output end of the driving motor, and the threaded rod is arranged inside the groove.

[0012] By adopting the above technical scheme, it can drive the structure outside the rod to move inside the groove by the rotation of the threaded rod.

[0013] Preferably, the driving mechanism further includes a slider threadedly connected to the threaded rod, and the slider is arranged inside the groove.

[0014] By adopting the above technical scheme, it can drive the connected structure to generate displacement together by sliding.

[0015] Preferably, the driving mechanism further includes a cylinder horizontally fixed on the top of the slider.

[0016] By adopting the above technical scheme, it can drive the structure at the output end to generate displacement by pushing.

[0017] Preferably, the driving mechanism further includes a first trapezoidal block arranged at the output end of the cylinder and a second trapezoidal block arranged on the connecting rod.

[0018] By adopting the above technical solution, the first trapezoidal block can horizontally move to drive the second trapezoidal block to generate an upward vertical movement force.

[0019] Preferably, the first trapezoidal block and the second trapezoidal block have the same shape.

[0020] A method for using an aluminum ash slag high-efficiency defluorination, dechlorination and denitrification treatment device includes the following steps:

[0021] Step S1: Place the aluminum ash slag into the interior of the crushing component and drive the crushing roller to rotate through a large-sized motor, thereby crushing the aluminum ash slag. Then, let the crushed aluminum ash slag fall onto the screening plate of the screening mechanism, and drive the screening plate to vibrate through the vibration motor, so that the aluminum ash slag can quickly carry out the screening work;

[0022] Step S2: When the screening plate becomes blocked, drive the blockage clearing mechanism to clean the screening plate through the driving mechanism;

[0023] Step S3: After the aluminum ash slag is screened, convey the screened aluminum ash slag into the interior of the defluorination tank. The defluorination tank adopts the chemical precipitation method, and uses the reaction of fluoride ions with calcium salts to generate insoluble calcium fluoride precipitation, thereby achieving the removal of fluorine. Convey the defluorinated aluminum ash slag into the interior of the dechlorination tank. The dechlorination tank converts chlorine elements into gases or low-toxic substances through high-temperature roasting or the chloride reduction method, reducing the chlorine content in the aluminum ash slag. Convey the defluorinated and dechlorinated aluminum ash slag into the interior of the denitrification tank. The denitrification tank adopts biological denitrification or chemical reduction methods to convert the nitrogen elements in the aluminum ash slag into nitrogen gas or other harmless substances, thereby achieving the removal of nitrogen;

[0024] Step S4: When it is necessary to clean the blockage of the screening plate, start the driving motor outside the fixed block. The driving motor drives the threaded rod on the output end to rotate, and the threaded rod enables the slider on the rod to stably move horizontally inside the groove;

[0025] Step S5: When the cylinder on the slider moves to the designated position, it drives the first trapezoidal block on the output end to move horizontally. During the horizontal movement of the first trapezoidal block, it will drive the second trapezoidal block and its connected structure to move vertically;

[0026] Step S6: When the second trapezoidal block moves vertically, it will drive the connecting rod and the mounting block connected to the connecting rod to move vertically synchronously. The mounting block will provide the upper blockage clearing rod to clean the mesh holes of the screening plate, and the first trapezoidal block provides an upward vertical force to the blockage clearing mechanism at different positions, thereby cleaning the blockage at different positions of the screening plate.

[0027] By adopting the above technical solution, it can be smoother during the fitting movement process.

[0028] In summary, the present invention includes the following beneficial effects: By providing a blockage clearing mechanism and a driving mechanism, the driving mechanism can provide full-automatic operation for the blockage clearing mechanism, and manual operation by personnel is not possible. When the blockage clearing mechanism clears the screening plate, it can clean part of the holes of the screening plate in each batch. During the cleaning process, the remaining unblocked holes of the screening plate can still simultaneously screen the aluminum ash slag, ensuring that during the process of cleaning the blockage, excessive accumulation of aluminum ash slag on the screening plate will not cause a reduction in the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional top view structural diagram of the present invention;

[0030] Figure 2 is a three-dimensional top view structural diagram of the screening mechanism, blockage clearing mechanism and driving mechanism of the present invention;

[0031] Figure 3 is a three-dimensional bottom view structural diagram of the screening mechanism, blockage clearing mechanism and driving mechanism of the present invention.

[0032] In the figure:

[0033] 1, fixed plate; 2, defluorination tank body; 3, dechlorination tank body; 4, denitrification tank body; 5, crushing assembly;

[0034] 6, screening mechanism; 601, screening plate; 602, vibration motor;

[0035] 7, blockage clearing mechanism; 701, guide rod; 702, mounting block; 703, blockage clearing rod; 704, connecting rod;

[0036] 8, driving mechanism; 801, fixed block; 802, groove; 803, driving motor; 804, threaded rod; 805, slider; 806, cylinder; 807, first trapezoidal block; 808, second trapezoidal block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] The following will further describe the embodiments of the present invention in detail with reference to the attached Figures 1-3 drawings.

[0039] Embodiment 1:

[0040] Please refer toFigures 1-3 , this embodiment provides a technical solution: a device and method for efficient defluorination, dechlorination and denitrification of aluminum ash slag, including: a fixed plate 1, a defluorination tank body 2, a dechlorination tank body 3, a denitrification tank body 4, a crushing assembly 5, a screening mechanism 6, a blockage clearing mechanism 7 and a driving mechanism 8;

[0041] The main body of the processing device consists of a fixed plate 1, a defluorination tank body 2, a dechlorination tank body 3 and a denitrification tank body 4 that are arranged at intervals above the fixed plate 1, and a crushing assembly 5 arranged on one side of the defluorination tank body 2 above the fixed plate 1. The screening mechanism 6 is arranged at the bottom discharge port of the crushing assembly 5. The screening mechanism 6 includes a screening plate 601 arranged at the bottom discharge port of the crushing assembly 5 and a vibration motor 602 fixed at one end of the bottom of the screening plate 601. The defluorination tank body 2 adopts the chemical precipitation method, and uses the reaction of fluoride ions with calcium salts to generate insoluble calcium fluoride precipitation, so as to achieve the removal of fluorine. The dechlorination tank body 3 converts chlorine elements into gases or low-toxic substances through high-temperature roasting or chloride reduction method, so as to reduce the chlorine content in the aluminum ash slag. The denitrification tank body 4 adopts biological denitrification or chemical reduction method to convert the nitrogen elements in the aluminum ash slag into nitrogen gas or other harmless substances, so as to achieve the removal of nitrogen. The crushing assembly 5 drives the crushing roller to rotate through a large motor, so as to crush the aluminum ash slag. The above is the prior art and will not be elaborated below.

[0042] The blockage clearing mechanism 7 is arranged at the bottom of the screening plate 601. The number of the blockage clearing mechanisms 7 is three. The blockage clearing mechanism 7 includes guide rods 701 welded on both sides of the bottom of the screening plate 601, mounting blocks 702 vertically slidably connected to the guide rods 701, blockage clearing rods 703 welded on the top of the mounting blocks 702 and connecting rods 704 welded on the outer walls of the mounting blocks 702. The driving mechanism 8 is arranged on the outer wall of the screening plate 601.

[0043] Put the aluminum ash slag into the inside of the crushing assembly 5 and drive the crushing roller to rotate through a large motor, so as to crush the aluminum ash slag. Then the crushed aluminum ash slag falls onto the screening plate 601 of the screening mechanism 6, and the vibration motor 602 drives the screening plate 601 to vibrate, so that the aluminum ash slag can be quickly screened. When the screening plate 601 is blocked, at this time, the driving mechanism 8 can automatically drive the blockage clearing mechanism 7 to clean the screening plate 601. When the screening of the aluminum ash slag is completed, at this time, the screened aluminum ash slag is transported to the inside of the defluorination tank body 2. The defluorination tank body 2 adopts the chemical precipitation method, and uses the reaction of fluoride ions with calcium salts to generate insoluble calcium fluoride precipitation, so as to achieve the removal of fluorine. The defluorinated aluminum ash slag is transported to the inside of the dechlorination tank body 3. The dechlorination tank body 3 converts chlorine elements into gases or low-toxic substances through high-temperature roasting or chloride reduction method, so as to reduce the chlorine content in the aluminum ash slag. The defluorinated and dechlorinated aluminum ash slag is transported to the inside of the denitrification tank body 4. The denitrification tank body 4 adopts biological denitrification or chemical reduction method to convert the nitrogen elements in the aluminum ash slag into nitrogen gas or other harmless substances, so as to achieve the removal of nitrogen.

[0044] When the second trapezoidal block 808 moves vertically, it will drive the connecting rod 704 and the mounting block 702 connected to the connecting rod 704 to move vertically synchronously. At this time, the mounting block 702 can move more stably through the guide rod 701 during the movement. At this time, the mounting block 702 will provide the upper blockage clearing rod 703 to clean the mesh holes of the screening plate 601, and the first trapezoidal block 807 will provide vertically upward power to the blockage clearing mechanism 7 at different positions, so as to clean the blockages at different positions of the screening plate 601.

[0045] Embodiment 2:

[0046] Please refer to Figures 1-3 In this embodiment, a technical solution is provided: an aluminum ash residue high-efficiency defluorination, dechlorination and denitrification treatment device and method, including: a fixed block 801, a groove 802, a driving motor 803, a threaded rod 804, a slider 805, a cylinder 806, a first trapezoidal block 807 and a second trapezoidal block 808;

[0047] The driving mechanism 8 includes a fixed block 801 welded to the outer wall of the screening plate 601 and a groove 802 opened above the fixed block 801, a driving motor 803 fixed on the outer wall of the fixed block 801 and a threaded rod 804 arranged on the output end of the driving motor 803. The threaded rod 804 is arranged inside the groove 802, a slider 805 threadedly connected to the threaded rod 804, and the slider 805 is arranged inside the groove 802. A cylinder 806 horizontally fixed on the top of the slider 805, a first trapezoidal block 807 arranged on the output end of the cylinder 806 and a second trapezoidal block 808 arranged on the connecting rod 704. The first trapezoidal block 807 and the second trapezoidal block 808 have the same shape.

[0048] When it is necessary to clean the blockage of the screening plate 601, at this time, by starting the driving motor 803 outside the fixed block 801, when the driving motor 803 is working, it can drive the threaded rod 804 on the output end to rotate. The threaded rod 804 can provide the slider 805 on the rod to stably move horizontally inside the groove 802. When the cylinder 806 on the slider 805 moves to the designated position, it will push the first trapezoidal block 807 on the output end to move horizontally. During the horizontal movement of the first trapezoidal block 807, it will drive the second trapezoidal block 808 and its connected structure to move vertically.

[0049] Embodiment 3:

[0050] On the basis of Embodiments 1 and 2, a use method of an aluminum ash residue high-efficiency defluorination, dechlorination and denitrification treatment device is further disclosed, including the following steps:

[0051] Step S1: Place the aluminum ash residue into the interior of the crushing assembly 5 and drive the crushing roller to rotate by a large motor to crush the aluminum ash residue. Then, let the crushed aluminum ash residue fall onto the screening plate 601 of the screening mechanism 6, and drive the screening plate 601 to vibrate through the vibration motor 602, enabling the aluminum ash residue to be quickly screened;

[0052] Step S2: When the screening plate 601 becomes blocked, drive the clogging cleaning mechanism 7 through the driving mechanism 8 to clean the screening plate 601;

[0053] Step S3: After the aluminum ash residue is screened, convey the screened aluminum ash residue into the interior of the defluorination tank 2. The defluorination tank 2 adopts the chemical precipitation method, using the reaction of fluoride ions with calcium salts to generate insoluble calcium fluoride precipitate, thereby achieving the removal of fluorine. Then, convey the defluorinated aluminum ash residue into the interior of the dechlorination tank 3. The dechlorination tank 3 converts chlorine elements into gases or low-toxic substances through high-temperature roasting or chloride reduction method to reduce the chlorine content in the aluminum ash residue. Next, convey the defluorinated and dechlorinated aluminum ash residue into the interior of the denitrification tank 4. The denitrification tank 4 adopts biological denitrification or chemical reduction method to convert the nitrogen elements in the aluminum ash residue into nitrogen gas or other harmless substances, thereby achieving the removal of nitrogen;

[0054] Step S4: When it is necessary to clean the blockage of the screening plate 601, start the driving motor 803 outside the fixed block 801. The driving motor 803 drives the threaded rod 804 on the output end to rotate, and the threaded rod 804 enables the slider 805 on the rod to stably move horizontally inside the groove 802;

[0055] Step S5: When the cylinder 806 on the slider 805 moves to the specified position, it then pushes the first trapezoidal block 807 on the output end to move horizontally. During the horizontal movement of the first trapezoidal block 807, it will drive the second trapezoidal block 808 and its connected structure to move vertically;

[0056] Step S6: When the second trapezoidal block 808 moves vertically, it will drive the connecting rod 704 and the mounting block 702 connected to the connecting rod 704 to move vertically synchronously. The mounting block 702 will provide the clogging cleaning rod 703 above to clean the mesh holes of the screening plate 601, and the first trapezoidal block 807 provides vertically upward power to the clogging cleaning mechanism 7 at different positions, thereby cleaning the blockages at different positions of the screening plate 601.

[0057] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. An efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag, characterized in that, Including: A main body of a processing device, which consists of a fixing plate (1), a defluorination tank body (2), a dechlorination tank body (3) and a denitrification tank body (4) arranged at intervals above the fixing plate (1), and a crushing assembly (5) arranged above the fixing plate (1) on one side of the defluorination tank body (2); A screening mechanism (6), which is arranged at the discharge port at the bottom of the crushing assembly (5). The screening mechanism (6) includes a screening plate (601) arranged at the discharge port at the bottom of the crushing assembly (5) and a vibration motor (602) fixedly arranged at one end of the bottom of the screening plate (601); A blockage clearing mechanism (7), which is arranged at the bottom of the screening plate (601), and the number of the blockage clearing mechanisms (7) is three groups; A driving mechanism (8), which is arranged on the outer wall of the screening plate (601).

2. An efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag according to claim 1, characterized in that: The blockage clearing mechanism (7) includes guide rods (701) welded on both sides of the bottom of the screening plate (601), mounting blocks (702) vertically slidably connected to the guide rods (701), blockage clearing rods (703) welded on the tops of the mounting blocks (702) and connecting rods (704) welded on the outer walls of the mounting blocks (702).

3. An aluminum ash slag high-efficiency defluorination, dechlorination and denitrification treatment device according to claim 2, characterized in that: The driving mechanism (8) includes a fixing block (801) welded on the outer wall of the screening plate (601) and a groove (802) opened above the fixing block (801).

4. An efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag according to claim 3, characterized in that: The driving mechanism (8) further includes a driving motor (803) fixedly arranged on the outer wall of the fixing block (801) and a threaded rod (804) arranged on the output end of the driving motor (803), and the threaded rod (804) is arranged inside the groove (802).

5. The high-efficiency fluorine, chlorine, and nitrogen removal treatment device for aluminum ash slag according to claim 4, characterized in that: The driving mechanism (8) further includes a slider (805) threadedly connected to the threaded rod (804), and the slider (805) is arranged inside the groove (802).

6. The high-efficiency defluorination, dechlorination and denitrification treatment device for aluminum ash slag according to claim 5, characterized in that: The driving mechanism (8) further includes a cylinder (806) horizontally fixedly arranged on the top of the slider (805).

7. An efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag according to claim 6, characterized in that: The driving mechanism (8) further includes a first trapezoidal block (807) arranged on the output end of the cylinder (806) and a second trapezoidal block (808) arranged on the connecting rod (704).

8. An efficient defluorination, dechlorination and denitrification treatment device for aluminum ash slag according to claim 7, characterized in that: The first trapezoidal block (807) and the second trapezoidal block (808) have the same shape.

9. The usage method of a device for efficiently removing fluorine, chlorine, and nitrogen from aluminum ash slag according to any one of claims 1-8, characterized in that, Including the following steps: Step S1: Place the aluminum ash residue into the inside of the crushing assembly (5), drive the crushing roller to rotate through a large-sized motor, so as to crush the aluminum ash residue, and then drop the crushed aluminum ash residue onto the screening plate (601) of the screening mechanism (6), and drive the screening plate (601) to vibrate through the vibration motor (602), so that the aluminum ash residue can quickly carry out the screening work; Step S2: When the screening plate (601) is blocked, drive the blockage clearing mechanism (7) through the driving mechanism (8) to clean the screening plate (601); Step S3: After the aluminum ash slag is screened, the screened aluminum ash slag is conveyed into the interior of the defluorination tank body (2). The defluorination tank body (2) adopts the chemical precipitation method, and uses the reaction of fluoride ions with calcium salts to generate insoluble calcium fluoride precipitate, so as to achieve the removal of fluorine. Then the defluorinated aluminum ash slag is conveyed into the interior of the dechlorination tank body (3). The dechlorination tank body (3) converts chlorine elements into gases or low-toxic substances through high-temperature roasting or the chloride reduction method, reducing the chlorine content in the aluminum ash slag. Then the defluorinated and dechlorinated aluminum ash slag is conveyed into the interior of the denitrification tank body (4). The denitrification tank body (4) adopts biological denitrification or chemical reduction method to convert the nitrogen elements in the aluminum ash slag into nitrogen gas or other harmless substances, so as to achieve the removal of nitrogen; Step S4: When it is necessary to clean the blockage of the screening plate (601), by starting the drive motor (803) outside the fixed block (801), the drive motor (803) drives the threaded rod (804) on the output end to rotate, and the threaded rod (804) enables the slider (805) on the rod to stably move horizontally inside the groove (802); Step S5: When the cylinder (806) on the slider (805) moves to the specified position, it horizontally moves by pushing the first trapezoidal block (807) on the output end. During the horizontal movement of the first trapezoidal block (807), it will drive the second trapezoidal block (808) and its connected structure to move vertically; Step S6: When the second trapezoidal block (808) moves vertically, it will drive the connecting rod (704) and the mounting block (702) connected to the connecting rod (704) to move vertically synchronously. The mounting block (702) will provide the cleaning rod (703) above to clean the mesh holes of the screening plate (601), and the first trapezoidal block (807) provides vertically upward power to the blockage cleaning mechanism (7) at different positions, so as to clean the blockage at different positions of the screening plate (601).

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