A polygonal drum screening device

Abstract

This utility model relates to the field of fluid treatment and separation technology, and discloses a polygonal drum screening device, including a base plate, a first support block and a second support block fixed to the upper part of the base plate, a second fixed cylinder fixed to the first support block, a first fixed cylinder fixed to the second support block, an outer cylinder fixed to both the first and second fixed cylinders at their respective ends, a maintenance mechanism on the outer cylinder, a solid-liquid separation mechanism on the upper part of the base plate, a drainage mechanism at the lower end of the outer cylinder, a first limiting post rotatably mounted on the inner wall of the second fixed cylinder, a second limiting post rotatably mounted on the inner wall of the first fixed cylinder, and a hexagonal cylinder fixed to both the first and second limiting posts at their respective ends. This utility model has the advantages of high integration, good separation efficiency, anti-clogging and easy maintenance, and continuous automated operation.

Description

Technical Field

[0001] This utility model relates to the field of fluid treatment and separation technology, specifically a polygonal drum screening device. Background Technology

[0002] In the fields of petroleum refining and chemical production, the industrial wastewater generated has a complex composition, often containing suspended solids (such as catalyst powder and coke powder), grease, and dissolved inorganic pollutants (such as fluoride ions). The effective treatment and reuse of such wastewater is of great significance for environmental protection and resource conservation.

[0003] Currently, the treatment of this type of wastewater usually requires multiple processes in series. Existing technologies generally adopt a process of physical separation followed by chemical treatment. For example, most of the suspended solids are removed by equipment such as sedimentation tanks, centrifuges or vibrating screens. Then, the preliminarily clarified wastewater is transported to a separate reaction tank or flocculation tank. Chemical agents are added to cause the dissolved pollutants to form precipitates or flocs. Finally, it undergoes sedimentation and filtration again to achieve deep purification. This kind of process is lengthy, requires a lot of equipment, occupies a large area, and has high investment and operating costs. At the same time, physical separation units (such as screens) are prone to clogging when processing viscous and fine materials, resulting in frequent shutdowns for cleaning. The degree of automation is low, the maintenance workload is large, and it is difficult to meet the stable operation requirements of continuous production. Utility Model Content

[0004] The purpose of this invention is to provide a polygonal drum screening device, which has the advantages of high integration, good separation efficiency, anti-clogging and easy maintenance, and continuous automated operation, thus solving the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A polygonal drum screening device includes a base plate, a first support block and a second support block fixed to the upper part of the base plate, a second fixed cylinder fixed to the first support block, a first fixed cylinder fixed to the second support block, an outer cylinder fixed to one end of the first and second fixed cylinders near each other, a maintenance mechanism disposed on the outer cylinder, a solid-liquid separation mechanism disposed on the upper part of the base plate, a drainage mechanism disposed at the lower end of the outer cylinder, a first limiting post rotatably mounted on the inner wall of the second fixed cylinder, a second limiting post rotatably mounted on the inner wall of the first fixed cylinder, and a maintenance mechanism disposed on the outer cylinder. The components include a hexagonal cylinder with the first and second limiting posts close to each other at one end, a motor fixed to the first fixed cylinder for rotating the second limiting post, at least one water injection groove penetrating the end of the second limiting post, a pipe connected to the side wall of the first fixed cylinder, a filter mechanism on one side of the hexagonal cylinder, filter holes penetrating the other five sides of the hexagonal cylinder, a liquid injection mechanism on the upper part of the bottom plate for injecting liquid into the outer cylinder, a fixed plate fixed to the inner wall of the outer cylinder, and a scraping mechanism sleeved on the outer peripheral wall of the hexagonal cylinder and the liquid injection mechanism.

[0007] The motor's output shaft is fixed to the end of the second limiting post away from the hexagonal cylinder, and the end of the hexagonal cylinder near the second limiting post has at least one inlet hole corresponding to the water injection tank.

[0008] Preferably, the maintenance mechanism includes a first groove extending through the upper end of the outer cylinder, a cover plate hinged to the inner wall of the first groove, and a handle fixed to the end of the cover plate away from the center of the outer cylinder. The cover plate is provided with a lock, and the locking block of the lock is adapted to the locking groove opened on the inner wall of the first groove.

[0009] It is worth noting that when the filter holes inside the hexagonal cylinder become severely clogged or when it is necessary to check the wear of internal components, operators can unlock and open the cover to directly and quickly carry out cleaning, repair or replacement work, which greatly simplifies the maintenance process, shortens equipment downtime, and ensures production continuity.

[0010] Preferably, the solid-liquid separation mechanism includes a collection box fixed to the upper end of the base plate, a support block fixed to both sides of the inner wall of the collection box, a first filter plate placed on the upper ends of the two support blocks, a water outlet pipe fixed through the side wall of the collection box, and a first valve body disposed on the water outlet pipe.

[0011] It is worth noting that the solid-liquid separation mechanism constitutes a secondary fine processing unit for the liquid after the initial separation. The liquid discharged from the outer cylinder first flows into the collection box and is intercepted by the first filter plate, which can effectively capture the fine solid particles or flocculent matter that may escape during the drum screening process, thereby deepening the degree of solid-liquid separation and improving the purity of the final discharged liquid.

[0012] Preferably, the draining mechanism includes a fixed pipe fixed to the lower end of the outer cylinder and a second valve body disposed on the fixed pipe.

[0013] It is worth noting that the fixed pipe is directly connected to the lowest point of the outer cylinder, which conforms to the principle that liquids naturally converge and flow due to gravity. This ensures that the liquid entering the outer cylinder through the hexagonal filter holes during the screening process is discharged in a timely and thorough manner, avoiding the accumulation of liquid in the outer cylinder that would affect the separation efficiency or increase the load on the cylinder. The integration of the second valve body enables active management of the drainage process. At the beginning of the screening operation or when the process needs to be adjusted, the second valve body can be closed to temporarily store the liquid in the outer cylinder, which plays a certain role in buffering or mixing. When discharge is required, the opening degree can be precisely controlled to adjust the flow rate, or it can be fully opened for rapid emptying, providing high operational flexibility.

[0014] Preferably, the filtration mechanism includes a second groove extending through one side of the hexagonal cylinder, a second filter plate hinged to the inner wall of the second groove, and a lock body disposed on the second filter plate, wherein the lock block of the lock body is adapted to the lock groove of the inner wall of the second groove.

[0015] It is worth noting that after prolonged operation, the inside of the hexagonal cylindrical filter holes may be clogged by tough or embedded impurities. In this case, the filter holes on that side can be directly exposed by unlocking and opening the second filter plate, and tools can be used to physically unclog them, making it easy to restore the filtration performance.

[0016] Preferably, the liquid injection mechanism includes a water pump and a solution tank fixed to the upper end of the base plate. The pump's suction end is fixedly connected to a suction pipe, the suction pipe's inlet end is connected to the solution tank's outlet end, the outer cylinder's side wall is fixedly connected to an inlet pipe, the pump's outlet end is connected to the inlet end of the inlet pipe via a pipe, the inlet pipe's outlet end is fixedly connected to a bend, the bend's outlet pipe is fixedly connected to a straight pipe, and the straight pipe's side wall has multiple through holes.

[0017] It is worth noting that by pumping cleaning fluid (such as water, solvent, or specific chemical agents) from the solution tank and spraying it evenly onto the inner wall or outer space of the hexagonal cylinder through the through-holes in the straight pipe sidewall, residual solid materials adhering to the filter holes and cylinder wall can be effectively washed away, achieving in-line cleaning (CIP) of the equipment and maintaining optimal separation efficiency. Secondly, this design allows the device to not only perform physical sieving but also integrate chemical treatment steps. For example, flocculants can be added to the solution tank and added simultaneously with sieving to promote the aggregation of fine particles, thereby allowing them to be better intercepted by the hexagonal cylinder and improving the separation effect. Thirdly, the spray cleaning or treatment process can be carried out automatically during equipment operation or intermittently without manual intervention, improving the automation level of the equipment and operational safety.

[0018] Preferably, the scraping mechanism includes a scraper that is simultaneously sleeved on the outer peripheral wall of the straight pipe and the outer peripheral wall of the hexagonal cylinder, a threaded post threaded on the scraper, a nut threaded on the outer peripheral wall of the threaded post, and a hand grip post fixed to one end of the scraper near the center of the second support block. One end of the threaded post passes through the scraper and is threaded into the wall of the fixed plate.

[0019] It is worth noting that during the screening process, a small amount of sticky material may pass through the filter holes or flow down the cylinder wall and adhere to the outer surface of the hexagonal cylinder. Long-term accumulation will affect the permeability of the filter holes and the flow of liquid. By rotating the hand-held column, the scraper can be moved axially along the straight pipe. The edge of the scraper can effectively scrape off these residues adhering to the outer wall of the hexagonal cylinder, keeping its surface clean. This mechanism fixes the position of the scraper through the threaded engagement of the threaded column and the fixed plate, and locks it with a nut. The structure is stable and reliable. In the non-cleaning state, the scraper can be fixed at a position away from the hexagonal cylinder to avoid interfering with normal screening. When cleaning is required, it can be easily adjusted to contact the cylinder wall.

[0020] Preferably, the straight pipe is located below the hexagonal cylinder, and there is a gap between the outer peripheral wall of the straight pipe and the inner wall of the hexagonal cylinder.

[0021] It is worth noting that the straight pipe is located below the hexagonal cylinder, allowing the cleaning or treatment fluid sprayed from the through-hole of the straight pipe to radiate upwards or outwards, more fully covering the inner wall area of ​​the hexagonal cylinder, achieving better cleaning or treatment results. The gap reserved between the straight pipe and the inner wall of the hexagonal cylinder fundamentally avoids the risk of contact, friction, or collision between the high-speed rotating hexagonal cylinder and the stationary straight pipe, ensuring the safety and reliability of equipment operation. At the same time, it ensures that the flow space of liquid and material in the cylinder is unobstructed. This gap provides the necessary installation and movement space for the scraper assembly in the scraping mechanism, which is the basis for the overall structural coordination design.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] 1. By setting a high-speed rotating hexagonal cylinder as the core dynamic filtration unit, and cooperating with the liquid injection mechanism (water pump, solution tank, straight pipe, etc.), the wastewater to be treated can be injected through the pipe and first undergo efficient separation of suspended solids by the centrifugal action of the hexagonal cylinder; at the same time or subsequently, chemical agents can be directly and evenly added to the separated water body by the liquid injection mechanism, and the flocculation reaction and secondary sedimentation are completed in the continuous space formed by the outer cylinder and the collection box, which significantly reduces the number of required equipment, floor space and pipeline connections, and lowers construction and operation and maintenance costs;

[0024] 2. The high-speed rotation of the hexagonal cylinder driven by the motor itself can generate strong shearing and scattering effects, which can reduce the adhesion of materials on the filter hole surface. Secondly, the specially designed scraping mechanism (scraper, threaded column, etc.) can be manually operated to move the scraper along the outer wall of the hexagonal cylinder to directly scrape off the sticky residue that has passed through the filter holes or adhered to the outside of the cylinder. The filter mechanism is designed with an openable structure. When the filter holes are severely blocked, the second filter plate can be opened for direct unblocking without disassembling the entire drum, which reduces the frequency of blockage and maintenance difficulty, and improves the online rate and processing continuity of the equipment.

[0025] 3. The non-circular cross-section structure of the hexagonal cylinder makes the material tumble more violently when it rotates, which enhances the kinetic conditions for solid-liquid separation and improves the primary separation effect. The separated water is fully mixed and reacted with the reagent in the outer cylinder, and the generated flocs are further intercepted by the first filter plate in the collection box under the action of gravity, thus achieving deep purification. Attached Figure Description

[0026] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0027] Figure 2 The diagram shown is a three-dimensional cross-sectional view of the present invention.

[0028] Figure 3 The diagram shown is a three-dimensional structural schematic of the hexagonal cylinder of this utility model.

[0029] Figure 4 The diagram shown is a three-dimensional structural schematic of the solid-liquid separation mechanism of this utility model.

[0030] Figure 5 The diagram shown is a three-dimensional cross-sectional view of the solid-liquid separation mechanism of this utility model.

[0031] Figure 6 The diagram shown is a three-dimensional structural schematic of the liquid injection mechanism of this utility model.

[0032] Figure 7 The diagram shown is a three-dimensional structural schematic of the straight tube of this utility model.

[0033] Figure 8 The diagram shown is a three-dimensional structural schematic of the scraping mechanism of this utility model.

[0034] Reference numerals: 1. Base plate; 101. Collection box; 102. Support block; 103. First filter plate; 104. Water outlet pipe; 105. First valve body; 2. First support block; 3. Second support block; 4. Outer cylinder; 5. First fixed cylinder; 501. Connecting pipe; 6. Second fixed cylinder; 7. First tank; 8. Cover plate; 9. Handle; 10. Motor; 11. Fixed pipe; 12. Second valve body; 13. Hexagonal cylinder; 14. First limiting post; 15. Second limiting post; 16. Water filling tank; 17. Second tank; 18. Second filter plate; 19. Lock body; 20. Filter hole; 21. Water pump; 22. Pumping pipe; 23. Solution tank; 24. Water inlet pipe; 25. Bend; 26. Straight pipe; 27. Through hole; 28. Fixed plate; 29. ​​Scraper; 30. Threaded post; 31. Nut; 32. Hand grip post. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] To address the problems of lengthy process flows, complex equipment, easy screen clogging and inconvenient maintenance, and low automation levels in existing technologies, the following technical solution is proposed. Please refer to [link / reference needed]. Figures 1-8 ;

[0037] A polygonal drum screening device includes a base plate 1, a first support block 2 and a second support block 3 fixed to the upper end of the base plate 1, a second fixed cylinder 6 fixed to the first support block 2, a first fixed cylinder 5 fixed to the second support block 3, an outer cylinder 4 fixed to one end of the first fixed cylinder 5 and the second fixed cylinder 6, a maintenance mechanism disposed on the outer cylinder 4, a solid-liquid separation mechanism disposed on the upper end of the base plate 1, a drainage mechanism disposed on the lower end of the outer cylinder 4, a first limiting post 14 rotatably mounted on the inner wall of the second fixed cylinder 6, a second limiting post 15 rotatably mounted on the inner wall of the first fixed cylinder 5, and a first limiting post 14 fixed to the inner wall of the second fixed cylinder 6. 14. A hexagonal cylinder 13 close to one end of the second limiting post 15; a motor 10 fixed to the first fixed cylinder 5 for rotating the second limiting post 15; at least one water injection groove 16 penetrating the end of the second limiting post 15; a pipe 501 penetrating and fixed to the side wall of the first fixed cylinder 5; a filter mechanism disposed on one side of the hexagonal cylinder 13; filter holes 20 penetrating the other five sides of the hexagonal cylinder 13; a liquid injection mechanism disposed on the upper end of the bottom plate 1 for injecting liquid into the outer cylinder 4; a fixed plate 28 fixed to the inner wall of the outer cylinder 4; and a scraping mechanism sleeved on the outer peripheral wall of both the hexagonal cylinder 13 and the liquid injection mechanism.

[0038] The output shaft of the motor 10 is fixed to the end of the second limiting post 15 away from the hexagonal cylinder 13. The end of the hexagonal cylinder 13 near the second limiting post 15 has at least one inlet hole corresponding to the water injection tank 16.

[0039] In use, refinery water containing oil, fine catalyst powder, and fluoride ions is injected into the outer cylinder 4 through the pipe 501 and flows into the hexagonal cylinder 13 through at least one water injection tank 16. Then, the motor 10 is turned on to make the second limit column 15 rotate, which drives the hexagonal cylinder 13 to rotate at high speed, thereby filtering out the non-impurity water in the water. Then, the liquid injection mechanism puts the reagent into the outer cylinder 4, so that the reagent and the non-impurity water react to generate flocculent matter. Then, the liquid discharge mechanism is turned on to discharge the mixture into the solid-liquid separation mechanism for secondary solid-liquid separation, so as to obtain reusable water.

[0040] It should be noted that the scraping mechanism is an auxiliary cleaning device used when the equipment is shut down for maintenance and does not affect the automated process during normal operation.

[0041] In this embodiment, specifically: the maintenance mechanism includes a first groove 7 that runs through the upper end of the outer cylinder 4, a cover plate 8 hinged to the inner wall of the first groove 7, and a handle 9 fixed to the end of the cover plate 8 away from the center of the outer cylinder 4. The cover plate 8 is provided with a lock, and the locking block of the lock is adapted to the locking groove opened in the inner wall of the first groove 7.

[0042] In this embodiment, the solid-liquid separation mechanism specifically includes a collection box 101 fixed to the upper end of the base plate 1, a support block 102 fixed to both sides of the inner wall of the collection box 101, a first filter plate 103 placed on the upper ends of the two support blocks 102, a water outlet pipe 104 fixed through the side wall of the collection box 101, and a first valve body 105 disposed on the water outlet pipe 104.

[0043] In this embodiment, specifically: the draining mechanism includes a fixed pipe 11 fixed to the lower end of the outer cylinder 4 and a second valve body 12 disposed on the fixed pipe 11.

[0044] In this embodiment, the filtering mechanism specifically includes a second groove 17 that extends through one of the faces of the hexagonal cylinder 13, a second filter plate 18 hinged to the inner wall of the second groove 17, and a lock body 19 disposed on the second filter plate 18. The lock block 2 of the lock body 19 is adapted to the lock groove 2 opened on the inner wall of the second groove 17.

[0045] In this embodiment, specifically: the liquid injection mechanism includes a water pump 21 and a solution tank 23 fixedly connected to the upper end of the base plate 1. The pump 21 has a pump pipe 22 fixedly connected to its pumping end. The pump pipe 22 is connected to the outlet end of the solution tank 23. The outer cylinder 4 has an inlet pipe 24 fixedly connected through the side wall. The pump 21 has an outlet end connected to the inlet end of the inlet pipe 24 through a pipe. The inlet pipe 24 has a bend 25 fixedly connected to its outlet end. The bend 25 has a straight pipe 26 fixedly connected to its outlet pipe. The straight pipe 26 has multiple through holes 27 opened through its side wall.

[0046] In this embodiment, specifically: the scraping mechanism includes a scraper 29 that is simultaneously sleeved on the outer peripheral wall of the straight pipe 26 and the outer peripheral wall of the hexagonal cylinder 13, a threaded post 30 threaded on the scraper 29, a nut 31 threaded on the outer peripheral wall of the threaded post 30, and a hand grip post 32 fixed to one end of the scraper 29 near the center of the second support block 3. One end of the threaded post 30 passes through the scraper 29 and is threaded into the wall of the fixed plate 28.

[0047] In this embodiment, specifically: the straight tube 26 is located below the hexagonal cylinder 13, and there is a gap between the outer peripheral wall of the straight tube 26 and the inner wall of the hexagonal cylinder 13.

[0048] Working principle: Refinery wastewater containing complex pollutants (such as oil, catalyst powder and fluoride ions) is first injected into a closed cavity consisting of a first fixed cylinder 5, a second fixed cylinder 6 and an outer cylinder 4 through the inlet pipe 501.

[0049] Wastewater then enters the interior of the hexagonal cylinder 13, which is supported by the first limiting post 14 and the second limiting post 15 and is rotatable, through the water injection groove 16 opened at the end of the second limiting post 15 and the corresponding inlet hole.

[0050] The motor 10, which is fixed to the first fixed cylinder 5, is started, and its output shaft drives the second limit post 15 to rotate, thereby driving the entire hexagonal cylinder 13 to rotate at high speed around its axis.

[0051] Under the action of centrifugal force, suspended solids in the wastewater with a particle size larger than the size of the filter hole 20 on the hexagonal cylinder 13 are trapped inside the cylinder, while the water penetrates the filter hole 20 under pressure, completing the initial solid-liquid separation. The separated filtrate enters the cavity between the hexagonal cylinder 13 and the outer cylinder 4.

[0052] After initial separation, the filtrate is collected at the lower part of the outer cylinder 4. At this time, the liquid injection mechanism consisting of water pump 21, solution tank 23, water suction pipe 22, water inlet pipe 24, bend pipe 25 and straight pipe 26 is started. The chemical agent (such as flocculant) prepared in the solution tank 23 is evenly sprayed into the filtrate in the cavity of the outer cylinder 4 through the through hole 27 on the side wall of the straight pipe 26, so that the dissolved pollutants undergo chemical reaction to generate flocculent precipitate.

[0053] Open the second valve body 12 located on the fixed pipe 11 at the lower end of the outer cylinder 4 to discharge the mixed liquid containing newly formed flocculents into the solid-liquid separation mechanism located on the bottom plate 1;

[0054] After the mixture enters the collection box 101, it flows through the first filter plate 103 placed on the support block 102. The flocculent matter and any remaining fine particles are further intercepted, achieving secondary deep solid-liquid separation. The purified water is discharged through the outlet pipe 104 and under the control of the first valve body 105 for reuse.

[0055] When impurities adhere to the outer wall of the hexagonal cylinder 13 due to long-term operation, the scraping mechanism can be operated. After loosening the nut 31, the hand grip column 32 is rotated to drive the scraper 29 to move along the axial direction of the threaded column 30, thereby scraping off the adhering substances. After cleaning, the nut 31 can be tightened to fix the position of the scraper 29.

[0056] If the filter holes 20 of the hexagonal cylinder 13 become severely clogged, the lock body 19 located on the second filter plate 18 in the filter mechanism can be unlocked to open the second filter plate 18 and directly unclog the interior.

[0057] Overall equipment maintenance can be performed by unlocking the lock body 19 on the cover plate 8 in the maintenance mechanism and opening the cover plate 8 using the handle 9, and then directly inspecting and cleaning the inside of the outer cylinder 4.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A polygonal drum screening device, characterized in that: The system includes a base plate (1), a first support block (2) and a second support block (3) fixed to the upper end of the base plate (1), a second fixed cylinder (6) fixed to the first support block (2), a first fixed cylinder (5) fixed to the second support block (3), an outer cylinder (4) fixed to one end of the first fixed cylinder (5) and the second fixed cylinder (6) close to each other, a maintenance mechanism on the outer cylinder (4), a solid-liquid separation mechanism on the upper end of the base plate (1), a drainage mechanism on the lower end of the outer cylinder (4), a first limiting post (14) rotatably installed on the inner wall of the second fixed cylinder (6), a second limiting post (15) rotatably installed on the inner wall of the first fixed cylinder (5), and a maintenance mechanism fixed to the first limiting post (14) and the second fixed cylinder (6). Two limiting posts (15) are close to each other at one end of a hexagonal cylinder (13), a motor (10) fixed to the first fixed cylinder (5) for rotating the second limiting post (15), at least one water injection tank (16) through the end of the second limiting post (15), a pipe (501) through the side wall of the first fixed cylinder (5), a filter mechanism set on one side of the hexagonal cylinder (13), filter holes (20) through the other five sides of the hexagonal cylinder (13), a liquid injection mechanism set on the upper end of the bottom plate (1) for injecting liquid into the outer cylinder (4), a fixed plate (28) fixed to the inner wall of the outer cylinder (4), and a scraping mechanism sleeved on the outer peripheral wall of the hexagonal cylinder (13) and the liquid injection mechanism. The output shaft of the motor (10) is fixed to the end of the second limiting post (15) away from the hexagonal cylinder (13), and the end of the hexagonal cylinder (13) near the second limiting post (15) has at least one inlet hole corresponding to the water injection tank (16).

2. The polygonal drum screening device according to claim 1, characterized in that: The maintenance mechanism includes a first groove (7) that runs through the upper end of the outer cylinder (4), a cover plate (8) hinged to the inner wall of the first groove (7), and a handle (9) fixed to the end of the cover plate (8) away from the center of the outer cylinder (4). The cover plate (8) is provided with a lock, and the locking block of the lock is compatible with the locking groove opened on the inner wall of the first groove (7).

3. A polygonal drum screening apparatus according to claim 1, characterized in that: The solid-liquid separation mechanism includes a collection box (101) fixed to the upper end of the base plate (1), a support block (102) fixed to both sides of the inner wall of the collection box (101), a first filter plate (103) placed on the upper end of the two support blocks (102), a water outlet pipe (104) fixed through the side wall of the collection box (101), and a first valve body (105) set on the water outlet pipe (104).

4. A polygonal drum screening apparatus according to claim 1, characterized in that: The draining mechanism includes a fixed pipe (11) fixed to the lower end of the outer cylinder (4) and a second valve body (12) disposed on the fixed pipe (11).

5. A polygonal drum screening apparatus according to claim 1, characterized in that: The filtration mechanism includes a second groove (17) that runs through one of the faces of the hexagonal cylinder (13), a second filter plate (18) hinged to the inner wall of the second groove (17), and a lock body (19) disposed on the second filter plate (18). The lock block of the lock body (19) is adapted to the lock groove of the inner wall of the second groove (17).

6. A polygonal drum screening apparatus according to claim 1, characterized in that: The liquid injection mechanism includes a water pump (21) and a solution tank (23) fixed to the upper end of the base plate (1). The pump (21) has a pump pipe (22) fixed to its pumping end. The pump pipe (22) has an inlet end connected to the outlet end of the solution tank (23). The outer cylinder (4) has an inlet pipe (24) fixed through its side wall. The pump (21) has an outlet end connected to the inlet end of the inlet pipe (24) through a pipe. The inlet pipe (24) has a bend pipe (25) fixed to its outlet end. The bend pipe (25) has a straight pipe (26) fixed to its outlet pipe. The straight pipe (26) has multiple through holes (27) through its side wall.

7. A polygonal drum screening device according to claim 6, characterized in that: The scraping mechanism includes a scraper (29) that is simultaneously fitted on the outer peripheral wall of the straight tube (26) and the outer peripheral wall of the hexagonal cylinder (13), a threaded post (30) threaded on the scraper (29), a nut (31) threaded on the outer peripheral wall of the threaded post (30), and a hand grip post (32) fixed to one end of the scraper (29) near the center of the second support block (3). One end of the threaded post (30) passes through the scraper (29) and is threaded into the wall of the fixed plate (28).

8. A polygonal drum screening apparatus according to claim 7, characterized in that: The straight tube (26) is located below the hexagonal cylinder (13), and there is a gap between the outer wall of the straight tube (26) and the inner wall of the hexagonal cylinder (13).

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