Waste incineration slag screening device

Abstract

The invention discloses a waste incineration slag screening device, and relates to the technical field of waste treatment. The device comprises a water tank, a feeding connecting frame, an outer pipe, an inner pipe, a containing box and a driving structure, the outer pipe is obliquely installed in the water tank and is coaxial with the inner pipe, the outer pipe is provided with a water inlet hole and a blocking structure, and the inner pipe is provided with a filtering hole; the driving structure drives the outer pipe and the inner pipe to rotate, after high-temperature slag enters the inner pipe through the feeding connecting frame, cooling and screening are synchronously completed under the action of cooling water of the water tank and dynamic water inlet of the blocking structure, fine particles enter the outer pipe through the filtering holes, and the fine particles and large slag are discharged into the two cavities of the containing box respectively. According to the device, cooling-screening integrated treatment of the high-temperature slag is achieved, transfer links are reduced, the pollution risk is reduced, and the treatment efficiency and the resource utilization rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste treatment, in particular to a waste incineration slag screening device, which is particularly suitable for cooling and grading and screening high-temperature slag after waste incineration. Background Art

[0002] Incineration technology is widely used in municipal solid waste management due to its significant waste reduction and heat recovery. However, the slag produced by incineration (primarily composed of molten silicates, metal oxides, and unburned residues) requires screening and processing to enable metal recovery, harmless landfill, or resource reuse (such as as building aggregate).

[0003] In existing technology, the temperature of slag discharged from the incinerator is usually as high as 600-800℃. Direct screening will cause damage to the screening equipment due to high temperature (such as deformation of the screen and failure of transmission components due to overheating). In addition, slag is prone to agglomeration at high temperatures, affecting the screening accuracy. Therefore, the industry generally adopts the "cooling first, then screening" process: One method is to pile the hot slag in an open area and allow it to cool naturally to room temperature (usually taking 24-48 hours), during which time the slag will continue to release heat and volatile matter. Another way is to cool the slag through a forced cooling device (such as a spray cooling tower, an air-cooled conveyor belt), and then transfer it to the screening equipment after cooling.

[0004] However, the above process has significant drawbacks: Multiple transfers increase health risks: The slag cooling process releases smoke and dust containing heavy metals and dioxins, as well as irritating gases (such as hydrogen chloride and sulfur dioxide). Workers are exposed to these pollutants directly or at close range when transferring high-temperature slag to the cooling area and then to the screening equipment. Long-term operation can easily lead to respiratory problems or skin damage. Inefficiency and high cost: Natural cooling takes too long and requires a lot of space; forced cooling devices consume additional energy (such as electricity and water) and have high equipment maintenance costs; multiple transfers require manpower and transportation equipment, further increasing processing costs; Secondary pollution risk: During the cooling process, smoke and dust in the slag are emitted in an unorganized manner, which can easily cause pollution to the surrounding air and soil. If the cooling wastewater is not treated properly (such as wastewater generated by spray cooling), it may also cause heavy metals to penetrate into the groundwater system.

[0005] Therefore, in order to address the problems of "time-consuming cooling, cumbersome transfer, and high pollution risk" caused by high temperature in the existing slag screening process, there is an urgent need for a screening device that can directly screen high-temperature slag, reduce transfer links, and reduce health and environmental hazards. Summary of the Invention

[0006] Based on this, the purpose of the present invention is to provide a waste incineration slag screening device to solve the problems of low efficiency, high pollution risk, and easy damage to equipment in the "cooling first, then screening" process in the prior art.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a waste incineration slag screening device, comprising a water tank, a feed connecting frame, an outer tube, and an inner tube, wherein a placement box and a drive structure are respectively provided on both sides outside the water tank, one end of the feed connecting frame is a slag inlet, and the other end of the feed connecting frame is detachably connected to one end of the outer tube, the inner tube is fixedly arranged inside the outer tube, and one end of the inner tube is connected to the interior of the feed connecting frame inside the outer tube, so that the slag passing through the feed connecting frame will flow into the inner tube; A rotating mounting bracket is installed on both side walls of the water tank, and the two rotating mounting brackets are arranged on the water tank in a high and low manner. The two rotating mounting brackets can enable the outer tube to be installed on the water tank in an inclined state, and both ends of the outer tube extend to the outside of the water tank, and the other ends of the outer tube and the inner tube are both located in the placement box; The outer tube and the inner tube are both provided with a plurality of openings distributed at equal intervals. The plurality of openings on the inner tube are filtering holes, and the plurality of openings on the outer tube are water inlet holes. Each water inlet hole on the outer tube is provided with a blocking structure, which is similar to a one-way valve structure. The driving structure is located on one side of the water tank and below one end of the outer tube. The working end of the driving structure is connected to the outside of the outer tube. The driving structure can rotate the outer tube on the water tank along the axis of the outer tube.

[0008] Furthermore, a partition plate is provided in the placement box, and the partition plate can divide the interior of the placement box into two to form two placement chambers, and a salvage rack is placed in one of the chambers in the placement box.

[0009] Through the separation of the partition plate, the smoke and fine slag discharged from the outer tube and the larger slag discharged from the inner tube can be collected separately to avoid mixing; the salvage rack facilitates the rapid removal of the larger slag after cooling, improving the convenience of operation.

[0010] Furthermore, the feed connecting frame is composed of a feed frame, a feed pipe and a mounting frame. One end of the feed frame is open, and the other end is connected to the feed pipe and the two are internally connected. The mounting frame is set on the side of the feed pipe that is inclined downward. The mounting frame can enable the outer tube to be installed on the feed pipe by bolts.

[0011] The large opening design of the feed rack is convenient for docking with the discharge end of the incinerator and for manual feeding; the detachable mounting frame facilitates the maintenance and replacement of the outer pipe.

[0012] Furthermore, an assembly bracket is provided on one side where the outer tube is connected to the feed tube, and the outer tube can be fixedly installed on the feed tube through the assembly bracket and bolts. A rotating bracket is provided between the assembly bracket and the outer tube, and the rotating bracket can enable the outer tube to be rotatably installed on the assembly bracket. A transmission gear is provided on the tube body of the outer tube, and the outer tube is connected to the working end of the drive structure through the transmission gear.

[0013] The rotating frame ensures that the outer tube rotates stably on the assembly frame. Cooperating with the linkage of the transmission gear and the drive structure, the outer tube can drive the inner tube to rotate synchronously, thereby accelerating the contact efficiency between the slag and the cooling water, and promoting the discharge of smoke and fine particles.

[0014] Furthermore, mounting plates are provided at both ends of the inner tube, and the inner tube is fixedly installed in the outer tube through the mounting plates on both sides, and a discharge port is provided at the bottom end of the mounting plate on the side of the inner tube close to the discharge end of the outer tube.

[0015] The mounting plate not only fixes the inner tube and the outer tube, but also ensures that there is a gap between them to facilitate the circulation of smoke and cooling water; the discharge port is used to guide the larger slag after cooling in the inner tube into the placement box.

[0016] Furthermore, each group of the blocking structure includes a fixed pipe, a water inlet pipe, a blocking frame and a spring. The fixed pipe is fixedly installed on the outer pipe and corresponds to the position of the water inlet hole. The water inlet pipe is arranged on the fixed pipe and the two are internally connected. The blocking frame is slidably installed on the water inlet pipe. One end of the blocking frame is located outside the water inlet pipe and contacts the clean water in the water tank, and the other end is located at the opening of the fixed pipe and blocks it. The spring is arranged between the blocking frame and the water inlet pipe, and the blocking frame closes the opening of the fixed pipe through the tension of the spring.

[0017] The one-way valve characteristic of the blocking structure can prevent a large amount of water in the water tank from flowing into the outer tube, and only allows a small amount of water to penetrate into the inner wall of the outer tube to form a water film; when the water vapor generated by the high-temperature slag impacts the blocking frame, the spring is compressed, the fixed tube opens, and the water in the water tank can enter the outer tube through the water inlet hole, realizing directional cooling of the slag.

[0018] Furthermore, each of the blocking racks is composed of a blocking plate and a connecting pipe. The blocking plate is slidably installed in the water inlet pipe through the connecting pipe. The spring is located around the connecting pipe between the blocking plate and the water inlet pipe. The interior of the blocking plate is hollow and has through holes at both ends. The interior of the blocking plate is connected to the interior of the connecting pipe.

[0019] The hollow structure of the connecting pipe and the blocking plate facilitates the water in the water tank to slowly seep into the outer pipe; the through hole ensures smooth water flow, and at the same time provides a force point for the blocking plate when water vapor impacts, thereby realizing the dynamic opening and closing of the water inlet hole.

[0020] Furthermore, the driving structure includes a driving mounting frame, a driving power supply, a transmission rod and a driving gear. The driving mounting frame is arranged on one side of the bottom end of the water tank, the driving power supply is installed on the driving mounting frame, the transmission rod is rotatably installed on one side of the water tank, the driving gear is installed on the transmission rod, the transmission rod is connected to the working end of the driving power supply, and the driving gear is engaged with the transmission gear on the outer tube.

[0021] The driving power drives the driving gear to rotate through the transmission rod, and is transmitted to the outer tube through the transmission gear, thereby realizing stable rotation of the outer tube. The structure is simple and the transmission efficiency is high.

[0022] Furthermore, the water level in the water tank is higher than the outer tube, the outer tube and the inner tube are concentrically arranged, and a gap is left between the inner walls of the inner tube and the outer tube.

[0023] The high water level of the water tank ensures that the outer tube is completely immersed in the cooling water, ensuring the cooling effect; the concentric setting and gap design facilitate the relative movement of the inner and outer tubes, while providing circulation space for water flow and smoke.

[0024] In summary, the present invention mainly has the following beneficial effects: 1. The present invention uses a feed rack through a feed connection rack that can be directly connected to the discharge end of the incinerator. The high-temperature slag enters the inner pipe directly through the feed pipe without being transferred to the cooling zone first. The inner pipe and the outer pipe are tilted and installed in the water tank through a rotating mounting frame. The whole is immersed in cooling water, and the slag is cooled and screened simultaneously in the pipe. The slag after cooling and screening is directly discharged into the placement box without the need for secondary transportation. In this application, the multiple transfer processes of "slag-cooling zone-screening equipment" in the prior art are omitted, avoiding exposure of workers to smoke and irritating gases containing heavy metals and dioxins during the transfer process. At the same time, the slag is cooled in a closed pipe, reducing the unorganized emission of smoke and dust, solving the problems of "time-consuming cooling, cumbersome transfer, and high pollution risk". The processing cycle is shortened from 24-48 hours in the prior art to 1-2 hours.

[0025] 2. In this invention, the drive mechanism rotates the outer and inner tubes (5-10 rpm) via transmission gears. The filter holes in the inner tube separate smoke and fine particles. The outer tube's blocking structure, activated by steam generated by the high-temperature slag, opens the water inlet, allowing cooling water to directly spray the slag for cooling. Larger slag is then discharged through the discharge port. During rotation, the slag is both dynamically cooled (to prevent agglomeration) and filtered through the filter holes, eliminating the need for staged operation. The tilt angle (5-15°) combined with the rotational force propels the slag continuously, enabling batch and continuous processing, increasing processing efficiency by over 50% compared to existing technologies.

[0026] 3. In this invention, the blocking structure's blocking frame seals the fixed tube under spring tension, allowing only a small amount of water to penetrate the inner wall of the outer tube, forming a water film. Steam generated by the hot slag contacting the water film impacts the blocking plate, compressing the spring to open the water inlet, allowing cooling water to enter on demand. As the slag cools, the steam decreases, and the spring pushes the blocking plate back into place, closing the water inlet. Cooling water is only replenished when the slag is hot, avoiding waste caused by continuous water inflow and achieving a water savings of 30%. Furthermore, the cooling intensity dynamically adjusts with the slag temperature, preventing undercooling (caking) or overcooling (slag soaking and dissolving), ensuring screening accuracy.

[0027] 4. In this invention, the outer and inner tubes are permanently immersed in the cooling water in the water tank, preventing high-temperature slag from directly contacting the pipes. A drive mechanism rotates the pipes, ensuring uniform slag contact with the inner wall, reducing localized wear. Removable mounting and assembly brackets facilitate pipe maintenance. The pipe temperature remains below 100°C, preventing deformation and oxidation caused by high temperatures (600-800°C). The rotational motion reduces wear on the pipes caused by slag agglomeration, extending the equipment's service life by over 30% compared to existing screening equipment.

[0028] 5. In this invention, the storage box's partition divides the chamber into two sections. Dust and fine particles (0.1-5 mm) discharged from the outer tube enter one chamber, while larger slag (>5 mm) discharged from the inner tube falls into a salvage rack on the other side. Slag of different particle sizes is collected separately, eliminating the need for secondary separation. Fine particles can be directly used for brick making, while larger particles facilitate metal recovery, increasing resource utilization by 20%. Wastewater is centrally treated in the storage box, preventing heavy metal infiltration and reducing secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the interior of the water tank of the present invention; Figure 3 Schematic diagram of the interior of the outer tube in the present invention; Figure 4 A partial schematic diagram of the outer tube and inner tube in the present invention Figure 1 ; Figure 5 A partial schematic diagram of the outer tube and inner tube in the present invention Figure 2 ; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 Schematic diagram of the ends of the outer tube and the inner tube in the present invention.

[0030] In the figure: 1. Water tank; 2. Feed connecting frame; 3. Outer pipe; 4. Inner pipe; 5. Placement box; 11. Rotating mounting frame; 21. Feed frame; 22. Feed pipe; 23. Mounting frame; 31. Water inlet; 32. Assembly frame; 33. Rotating frame; 34. Transmission gear; 41. Filter hole; 42. Mounting plate; 43. Discharge port; 51. Partition plate; 52. Salvage frame; 6. Blocking structure; 61. Fixed pipe; 62. Water inlet pipe; 63. Blocking frame; 631. Blocking plate; 632. Connecting pipe; 633. Through hole; 64. Spring; 7. Driving structure; 71. Driving mounting frame; 72. Driving power supply; 73. Transmission rod; 74. Driving gear. DETAILED DESCRIPTION

[0031] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0032] The following describes an embodiment of the present invention based on its overall structure.

[0033] Example 1 Feeding and initial state setting Structural Design: One end of the feed rack 21 features an open, wide opening, allowing it to dock directly with the incinerator's slag discharge port (secured via a flange or snap-fit ​​mechanism). If direct docking isn't possible, high-temperature slag (600-800°C) can be manually or mechanically poured into the feed rack 21. The other end of the feed rack 21 communicates with the feed pipe 22, a downward-sloping arc. Its distal end is secured to the assembly bracket 32 ​​of the outer tube 3 via a mounting bracket 23, securing the feed channel to the outer tube 3 with bolts. This seals the connection. The outer tube 3 is flexibly connected to the assembly bracket 32 ​​via a rotating bracket 33, ensuring that the outer tube 3 can rotate freely about its axis while the feed pipe 22 remains stationary.

[0034] Effect: The arc-shaped inclined feed pipe 22 uses gravity to make the slag slide naturally into the inner pipe 4, without the need for additional power transmission, saving energy consumption; the detachable bolt connection facilitates the later cleaning and maintenance of the inside of the pipeline; the design of the rotating frame 33 provides a structural basis for the rotary screening of the outer pipe 3.

[0035] Rotation drive of outer tube and inner tube Structural coordination: When the drive power supply 72 is activated, its output shaft drives the transmission rod 73 to rotate. The drive gear 74 at the end of the transmission rod 73 engages with the transmission gear 34 on the outer wall of the outer tube 3, thereby driving the outer tube 3 to rotate about its own axis (the speed can be adjusted by the drive power supply 72, typically set to 5-10 rpm). The inner tube 4 is fixedly connected to the outer tube 3 via mounting plates 42 at both ends, so it rotates synchronously with the outer tube 3. The ends of the outer tube 3 are mounted on either side of the water tank 1 via rotating mounting brackets 11, with the height difference between the two ends forming an inclination angle of 5-15°.

[0036] Effect: The slow rotational motion causes the slag in the inner tube 4 to roll continuously, avoiding agglomeration, ensuring uniform contact between the slag surface and the cooling medium, and improving cooling efficiency; the tilt angle combined with the rotational force can push the slag to move slowly toward the discharge end, realizing continuous processing; the rotating mounting frame 11 not only ensures the stable rotation of the outer tube 3, but also immerses the entire tube 3 in the cooling water of the water tank 1, forming a low-temperature environment.

[0037] At the same time, the rotation of the outer tube 3 not only provides the basis for the synchronous rotation of the inner tube 4, but its own rotation also produces the following key effects through dynamic coordination with the water flow and slag particles: Accelerate water circulation and heat exchange As outer tube 3 rotates within the cooling water in water tank 1, its outer wall continuously cuts through the water, forming a spiral flow along the axial direction of outer tube 3. This flow quickly removes heat absorbed by the outer tube 3's surface from contact with the high-temperature slag, preventing localized temperature increases within outer tube 3. Furthermore, the spiral flow enhances the overall circulation of the cooling water within water tank 1, making the water temperature more evenly distributed within tank 1, preventing localized temperature increases due to continuous heat absorption and ensuring stable cooling efficiency.

[0038] Enhance inner wall cleaning to prevent clogging The inner wall of outer tube 3 is clogged with soot, fine slag particles, and especially viscous molten residues that fall through filter holes 41 of inner tube 4. The rotation of outer tube 3 creates relative motion between the inner wall and the infiltrating cooling water. Centrifugal force forces the water to flow against the inner wall, continuously flushing the adhering particles and effectively reducing residue accumulation. Simultaneously, the rotational motion, combined with the tilt angle of outer tube 3, propels the flushed particles toward the discharge port, preventing clogging of filter holes 41 and water inlet 31 and ensuring long-term, stable operation of the equipment.

[0039] Optimizing the synergistic effect between the water inlet 31 and the blocking structure 6 As outer tube 3 rotates, its surface water inlet holes 31 and plugging structure 6 periodically dip into different water level areas of tank 1. This cyclical motion ensures more even contact between the connecting pipe 632 of plugging structure 6 and the cooling water, ensuring stable water infiltration efficiency. Furthermore, the slight vibration generated by the rotation helps plugging structure 6 return to its original position more flexibly under the action of spring 64, reducing the risk of loose closure of plugging plate 631 due to particle jamming and improving the accuracy of "water inlet on demand."

[0040] Promote the discharge of particles in the gap between the outer tube 3 and the inner tube 4 In the gap between outer tube 3 and inner tube 4, smoke and fine particles falling through filter holes 41 rely on water flow and gravity to move toward the discharge end. The rotation of outer tube 3 drives the water flow in the gap to form a spiral trajectory. The axial thrust generated by the spiral water flow accelerates particle movement, preventing particles from settling in the gap, especially at the bottom of the pipe, ensuring the gap is unobstructed and further improving screening efficiency.

[0041] Dynamic coordination of cooling and blocking structures Structural coordination: The cooling water level in water tank 1 (temperature controlled at 20-30°C) is higher than that of outer tube 3, and connecting tube 632 of plugging structure 6 is submerged in water. Initially, the tension of spring 64 forces plugging plate 631 to fit tightly against the opening of fixed tube 61, allowing only a small amount of water to penetrate into outer tube 3 through the gap between plugging plate 631 and fixed tube 61 and through hole 633, forming a thin film of water on the inner wall of outer tube 3. When high-temperature slag enters inner tube 4 and comes into contact with the water film, it instantly generates a large amount of water vapor. This water vapor enters fixed tube 61 through water inlet 31, exerting an outward force on plugging plate 631, compressing spring 64 and separating plugging plate 631 from fixed tube 61. This opens water inlet 31, allowing cooling water to flow through fixed tube 61 into outer tube 3.

[0042] The dynamic feedback mechanism of "small water seepage - steam thrust - large water inflow" ensures on-demand cooling water supply: the higher the slag temperature, the more steam is generated, the wider the opening of the water inlet 31 is, and the greater the cooling intensity. When the slag cools below 100°C, the steam decreases, and the spring 64 pushes the blocking plate 631 back to its original position, stopping water inflow and avoiding water waste. This design ensures rapid cooling of high-temperature slag while preventing slag soaking caused by excessive cooling water (preventing excessive dissolution of fine particles and affecting screening accuracy).

[0043] Screening and graded collection Structural coordination: As the inner tube 4 rotates, smoke (particle size <0.1mm) and fine particles (0.1-5mm) in the slag pass through the filter holes 41 (set to 5mm) and fall into the gap between the outer tube 3 and inner tube 4, while larger slag (particle size >5mm) is retained in the inner tube 4. The cooling water on the inner wall of the outer tube 3 forms a spiral flow under the action of rotation, carrying the smoke and fine particles in the gap toward the discharge end, ultimately discharging from the end of the outer tube 3 into a chamber on one side of the storage box 5 (not on the side of the overturning frame). The larger slag in the inner tube 4 moves toward the discharge port 43 under the action of the rotation and tilting force, ultimately falling into the overturning frame 52 on the other side of the storage box 5.

[0044] Effect: The particle size design of the filter holes 41 enables preliminary classification of the slag, meeting the different needs of subsequent resource reuse (such as fine particles can be used for brick making, and larger particles can be used for metal recovery); the combination of spiral water flow and rotational motion improves the discharge efficiency of fine particles and avoids blockage; the separation design of the partition plate 51 enables the classification and collection of slag of different particle sizes, reducing the subsequent separation process; the salvage frame 52 adopts a grid structure, which can quickly drain the moisture on the surface of larger slag, facilitating direct removal.

[0045] Equipment reset and cycle operation Structural coordination: After processing a batch of slag (the single processing volume depends on the pipe diameter, typically 50-100 kg), turn off the drive power supply 72 and the feed channel. Open the drain valve (not shown) of the storage box 5 to drain the wastewater (which can be connected to a sewage treatment system). Remove the larger slag from the salvage frame 52, and clean any remaining particles in the chambers on both sides. The blocking mechanism 6 automatically resets when steam pressure is lost, continuing to moisten the inner wall of the outer pipe 3 with a small amount of water seepage, waiting for the next batch of slag to enter.

[0046] Effect: The automated reset process reduces manual intervention and improves operational continuity; the centralized drainage design facilitates unified treatment of wastewater containing heavy metals, reducing the risk of environmental pollution; the automatic reset of the blocking structure 6 ensures the equipment's cyclic operation capability.

[0047] Through the coordinated cooperation of the above-mentioned structures, the present invention realizes the integrated treatment of "cooling-screening-grading and collection" of high-temperature slag, solves the problems of cumbersome transfer, low efficiency and high pollution risk in the existing technology, and has significant practical value and environmental significance.

[0048] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A waste incineration slag screening device, characterized by: It comprises a water tank (1), a feed connecting frame (2), an outer tube (3) and an inner tube (4), wherein a placement box (5) and a driving structure (7) are respectively provided on both sides outside the water tank (1), one end of the feed connecting frame (2) is a slag inlet, and the other end of the feed connecting frame (2) is detachably connected to one end of the outer tube (3), and the inner tube (4) is fixedly arranged inside the outer tube (3), and one end of the inner tube (4) is in communication with the interior of the feed connecting frame (2) inside the outer tube (3); A rotating mounting frame (11) is installed on both side walls of the water tank (1), and the two rotating mounting frames (11) are arranged on the water tank (1) in a high and low position. The two rotating mounting frames (11) can enable the outer tube (3) to be installed on the water tank (1) in an inclined state, and both ends of the outer tube (3) extend to the outside of the water tank (1), and the other ends of the outer tube (3) and the inner tube (4) are both located in the placement box (5); The outer tube (3) and the inner tube (4) are both provided with a plurality of openings distributed at equal intervals, the plurality of openings on the inner tube (4) are filter holes (41), the plurality of openings on the outer tube (3) are water inlet holes (31), and each water inlet hole (31) on the outer tube (3) is provided with a blocking structure (6), and the blocking structure (6) is similar to a one-way valve structure; The driving structure (7) is located on one side of the water tank (1) and below one end of the outer tube (3). The working end of the driving structure (7) is connected to the outer side of the outer tube (3). The driving structure (7) enables the outer tube (3) to rotate on the water tank (1) along the axis of the outer tube (3).

2. The waste incineration slag screening device according to claim 1, characterized in that: The placement box (5) is provided with a partition plate (51), and the partition plate (51) can divide the interior of the placement box (5) into two to form two placement chambers. A salvage rack (52) is placed in one of the chambers in the placement box (5).

3. The waste incineration slag screening device according to claim 1, characterized in that: The feed connection frame (2) is composed of a feed frame (21), a feed pipe (22) and a mounting frame (23). One end of the feed frame (21) is open, and the other end is connected to the feed pipe (22) and the two are internally communicated. The mounting frame (23) is arranged on the side of the feed pipe (22) that is tilted downward. The mounting frame (23) can enable the outer tube (3) to be mounted on the feed pipe (22) by bolts.

4. The waste incineration slag screening device according to claim 3, characterized in that: An assembly frame (32) is provided on one side of the outer tube (3) connected to the feed tube (22). The outer tube (3) can be fixedly mounted on the feed tube (22) via the assembly frame (32) and bolts. A rotating frame (33) is provided between the assembly frame (32) and the outer tube (3). The rotating frame (33) can rotatably mount the outer tube (3) on the assembly frame (32). A transmission gear (34) is provided on the body of the outer tube (3). The outer tube (3) is connected to the working end of the drive structure (7) via the transmission gear (34).

5. The waste incineration slag screening device according to claim 1, characterized in that: Both ends of the inner tube (4) are provided with mounting plates (42), and the inner tube (4) is fixedly mounted in the outer tube (3) via the mounting plates (42) on both sides, and a discharge port (43) is provided at the bottom end of the mounting plate (42) on the side of the inner tube (4) close to the discharge end of the outer tube (3).

6. The waste incineration slag screening device according to claim 1, characterized in that: Each group of the blocking structures (6) comprises a fixed tube (61), a water inlet tube (62), a blocking frame (63) and a spring (64). The fixed tube (61) is fixedly mounted on the outer tube (3) and corresponds to the position of the water inlet hole (31). The water inlet tube (62) is arranged on the fixed tube (61) and the two are internally connected. The blocking frame (63) is slidably mounted on the water inlet tube (62). One end of the blocking frame (63) is located outside the water inlet tube (62) and contacts the clean water in the water tank (1), and the other end is located at the opening of the fixed tube (61) and blocks it. The spring (64) is arranged between the blocking frame (63) and the water inlet tube (62). The blocking frame (63) closes the opening of the fixed tube (61) through the tension of the spring (64).

7. The waste incineration slag screening device according to claim 6, characterized in that: Each of the blocking frames (63) is composed of a blocking plate (631) and a connecting pipe (632). The blocking plate (631) is slidably installed in the water inlet pipe (62) via the connecting pipe (632). The spring (64) surrounds the connecting pipe (632) and is located between the blocking plate (631) and the water inlet pipe (62). The blocking plate (631) is hollow inside and has through holes (633) at both ends. The inside of the blocking plate (631) is connected to the inside of the connecting pipe (632).

8. The waste incineration slag screening device according to claim 1, characterized in that: The driving structure (7) comprises a driving mounting frame (71), a driving power supply (72), a transmission rod (73) and a driving gear (74); the driving mounting frame (71) is arranged on one side of the bottom end of the water tank (1); the driving power supply (72) is mounted on the driving mounting frame (71); the transmission rod (73) is rotatably mounted on one side of the water tank (1); the driving gear (74) is mounted on the transmission rod (73); the transmission rod (73) is connected to the working end of the driving power supply (72); and the driving gear (74) is meshed with the transmission gear (34) on the outer tube (3).

9. The waste incineration slag screening device according to claim 1, characterized in that: The water level in the water tank (1) is higher than the outer tube (3); the outer tube (3) and the inner tube (4) are concentrically arranged, and a gap is left between the inner walls of the inner tube (4) and the outer tube (3).

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