Rotary drum type filtering device

Abstract

The utility model relates to a rotary drum type filtering device, which comprises a rotary drum, a filter screen and a filter screen, the fixed cylinder is sleeved with the rotary cylinder and fixed to the rack, the outer circumferential face of the fixed cylinder makes contact with the inner circumferential face of the rotary cylinder, and a plurality of unit cavities distributed in the circumferential direction are formed in the body; the cavities of the unit cavities are respectively communicated with the vacuum pipes through pipeline structures, and pore channel structures for communicating the cavities with the wall of the rotary drum screen plate are arranged on the wall bodies; the slurry spraying and coating unit is oppositely arranged at the upper left part of the rotary drum and can spray the filter slurry on the sieve plate wall of the rotary drum; the leaching unit is oppositely arranged on the downstream side of the slurry spraying and coating unit and can be used for leaching the filter cake layer sprayed and coated outside the rotary drum; the air drying unit is oppositely arranged on the downstream side of the drip washing unit; the scraping plate unit is relatively arranged below the rotary drum and is positioned on the downstream side of the air drying unit; the powder collecting unit is oppositely arranged below the scraper blade unit; and the transmission unit can drive the rotary drum to rotate in the clockwise direction. The energy consumption can be reduced, the structure is simplified, and the failure rate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter equipment technical field, concretely relates to a kind of rotary drum filter device that solid and liquid in slurry can be separated. BACKGROUND

[0002] Filter equipment is the mechanical equipment or device used for filtration, and is a common general-purpose equipment in industrial production. Filter equipment is generally divided into two categories: vacuum and pressurization. Commonly used vacuum types include rotary drum, disc, horizontal belt, etc. Commonly used pressurization types include filter press, press, dynamic filtration and rotary type, etc.

[0003] Rotary drum vacuum filter is a widely used continuous operation filter equipment in industry. The main body of this filter equipment is a rotatable cylinder. The cylinder cavity is divided into several fan-shaped cavities along the radial direction. Each fan-shaped cavity has a separate hole / pipe connected to external equipment. These holes / pipes are connected to vacuum pipes and compressed air pipes in turn through a distribution head. When the cylinder rotates, the lower part of the cylinder is immersed in the filter slurry tank. Therefore, during one revolution of the cylinder, each fan-shaped cavity surface can sequentially perform operations such as filtration, washing, drying, blowing, unloading, etc. When some fan-shaped cavities start to immerse in the filter slurry, the corresponding holes on the cylinder are connected to the vacuum pipes, and the filtrate is sucked away. After these fan-shaped cavities are turned out of the filter slurry tank, they are still connected to the vacuum pipes to continue to suck the filtrate remaining in the filter cake. As the cylinder rotates, these fan-shaped cavities are turned to the washing spray area to spray washing water on the filter cake. At this time, these fan-shaped cavities suck the washing water through other vacuum pipes. When the cylinder rotates out of the washing area, the corresponding position of these fan-shaped cavities is not connected to any pipe, which is called the non-working area. A cutter is provided at the end of the non-working area to cut the filter cake solidified on the outer surface of the cylinder. Therefore, when the fan-shaped cavities on the cylinder are transferred from one area to another, the existence of the non-working area prevents the operation areas from being connected to each other.

[0004] The existing rotary drum vacuum filter device needs to immerse the cylinder into the filter slurry tank. Not only does this cause relatively high energy consumption due to the relatively large resistance experienced by the rotating cylinder, but it also affects the degree of complete suction of the filtrate. In addition, the holes / pipes connected to each fan-shaped cavity need to be selectively connected to the corresponding vacuum pipes, compressed air pipes, etc. through a distribution head, which has a relatively complex structure and a relatively high failure rate. SUMMARY

[0005] The rotary drum type filtering device sprays slurry on the screen plate wall of the rotary drum, and through the vacuum cavity communicated with the screen plate wall, the slurry attached to the outer surface of the rotary drum is subjected to slurry suction, cleaning and other steps, and the filtering operation is completed.

[0006] The technical scheme adopted by the utility model to solve its technical problems is as follows: a rotary drum type filtering device, comprising:

[0007] The rotary drum is arranged on the frame in a horizontal direction and is pivotally arranged on the frame; the middle part of the side wall of the rotary drum is formed as a screen plate wall;

[0008] The fixed cylinder is coaxially arranged opposite to the rotary drum and is fixed on the frame; the outer peripheral surface of the fixed cylinder is in contact with the inner peripheral surface of the rotary drum; a plurality of independent unit cavities are arranged in the circumferential direction in the cylinder cavity of the fixed cylinder; a hole structure communicated with the cavity of the unit cavity is formed on the side wall of the unit cavity in contact with the rotary drum; the cavity of the unit cavity is communicated with the vacuum pipe through a pipeline structure;

[0009] The slurry spraying unit is arranged opposite to the upper left of the rotary drum and corresponds to at least one unit cavity, and can spray filter slurry on the screen plate wall of the rotary drum at the corresponding position of the unit cavity;

[0010] The elution unit is arranged opposite to the downstream side of the slurry spraying unit and corresponds to another unit cavity or a plurality of unit cavities, and can elute the filter cake layer attached to the outer surface of the rotary drum;

[0011] The air drying unit is arranged opposite to the downstream side of the elution unit, can blow hot air to the filter cake layer attached to the outer surface of the rotary drum, and performs drying operation;

[0012] The scraper unit is arranged opposite to the lower left or lower right of the rotary drum and is located on the downstream side of the air drying unit, and can scrape the filter cake layer attached to the outer surface of the rotary drum from the rotary drum;

[0013] The powder collecting unit is arranged below the scraper unit and is used for collecting the filter cake powder scraped from the rotary drum;

[0014] And the transmission unit is matched with the rotary drum and can drive the rotary drum to rotate in the clockwise direction.

[0015] Optionally, the unit cavity corresponding to the rinsing unit has multiple unit cavities arranged in sequence along the circumferential direction, and a rinsing nozzle is arranged corresponding to each unit cavity to rinse the filter cake layer adhered to the rotating drum outside the radially corresponding position of each unit cavity.

[0016] Optionally, an annular flange extending radially outward is arranged at the port of the rotating drum. The outer circumferential surface of the annular flange is formed as a tooth surface, and the output gear of the transmission unit is engaged with the tooth surface of the annular flange.

[0017] Optionally, the unit cavity is open on the side facing the inner circumferential surface of the rotating drum, and the slot extends axially. At least one rotating roller is arranged at each end of the slot on both sides of the unit cavity, and the axial extension direction of the rotating roller is parallel to the axial extension direction of the fixed drum. When the fixed drum is sleeved inside the rotating drum, the roller surface of the rotating roller can be in sealing contact with the inner circumferential surface of the rotating drum. When the rotating drum rotates, the contact friction between the inner circumferential surface of the rotating drum and the roller surface of the rotating roller can drive the rotating roller to rotate relative to the fixed drum.

[0018] Optionally, the air drying unit is matched with at least one unit cavity arranged on the downstream side of the rinsing unit. The unit cavity matched with the air drying unit is communicated with a fan pipeline or a compressor pipeline, so that the hot air blown out of the rotating drum can be sucked into the unit cavity, achieving the purpose of recycling the hot air.

[0019] Optionally, a metal mesh is arranged outside the screen wall of the rotating drum, and a filter cloth is arranged on the metal mesh.

[0020] The patent also relates to a rotating drum filter device, which comprises:

[0021] a rotating drum, the axis of which is arranged in the horizontal direction and is pivotally arranged on the frame; the middle part of the side wall of the rotating drum is formed as a screen wall;

[0022] a fixed drum, which is coaxially arranged opposite to the rotating drum and is fixed on the frame; the outer circumferential surface of the fixed drum is in contact with the inner circumferential surface of the rotating drum; an annular cavity is formed on the fixed drum, and a plurality of hole structures distributed in sequence along the circumference are formed on the side wall of the annular cavity in contact with the rotating drum; the annular cavity is communicated with an external vacuum pipe through a pipeline structure;

[0023] a slurry spraying unit, which is arranged opposite to the upper left side of the rotating drum and is matched with the hole structure at one end of the annular cavity, so as to spray the filter slurry on the screen wall of the rotating drum;

[0024] A rinsing unit is arranged on the downstream side of the slurry spraying unit and corresponds to one or more of the channel structures, and is capable of rinsing the filter cake layer on the outer surface of the rotary drum;

[0025] A drying unit is arranged on the downstream side of the rinsing unit, and is capable of blowing hot air to the filter cake layer on the outer surface of the rotary drum to perform drying;

[0026] A scraper unit is arranged on the lower left or right side of the rotary drum and on the downstream side of the drying unit, and is capable of scraping the filter cake layer on the outer surface of the rotary drum from the rotary drum;

[0027] A powder collecting unit is arranged below the scraper unit, and is capable of collecting the filter cake powder scraped from the rotary drum;

[0028] A driving unit is arranged corresponding to the rotary drum, and is capable of driving the rotary drum to rotate in the clockwise direction.

[0029] The plurality of channel structures formed on the fixed drum in the circumferential direction correspond to the screen plate wall on the rotary drum, and the holes on the screen plate wall are in communication with the annular cavity of the fixed drum through each channel structure on the fixed drum. Then, the suction force is formed at each channel structure through the vacuum tube connected to the annular cavity of the fixed drum by the external vacuum device, so that the filtrate or rinsing liquid in the filter cake layer on the radial outer side of each channel structure is sucked into the annular cavity of the fixed drum, achieving the purpose of separating the filtrate or rinsing liquid.

[0030] Therefore, at least one or more channel structures are arranged on the fixed drum corresponding to the positions of the slurry spraying unit and the rinsing unit to establish a flow channel for sucking the filtrate or rinsing liquid into the annular cavity on the fixed drum. In order to realize the recovery of the hot air blown by the drying unit and reduce energy loss, one or more channel structures can also be arranged on the fixed drum corresponding to the position of the drying unit to suck the hot air blown onto the filter cake layer on the outer surface of the rotary drum into the annular cavity. Each channel structure arranged on the fixed drum extends in the axial direction of the fixed drum, and each channel structure can be continuously connected in the circumferential direction or can be distributed intermittently.

[0031] The beneficial effects of this utility model are as follows: The rotary drum filtration device provided by this patent sprays the slurry / filter slurry onto the screen wall of the rotary drum. Then, through a vacuum chamber connected to the screen wall (i.e., the aforementioned unit chamber or annular chamber), the slurry adhering to the outer surface of the rotary drum is sequentially subjected to suction, washing, and other treatment steps to complete the filtration operation. Compared to existing rotary drum vacuum filtration devices, this patent does not require the rotary drum to be immersed in the slurry tank, significantly reducing the resistance encountered during rotation and thus relatively reducing energy consumption. Furthermore, the multiple independent chambers / units formed on the fixed drum correspond to different positions on the screen wall as the drum rotates, eliminating the need for related structures such as distribution heads. This greatly simplifies the overall structure and significantly reduces the failure rate of the entire device. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the assembly structure of the filtration device.

[0033] Figure 2 This is a schematic cross-sectional view of the rotating cylinder in the filtration device.

[0034] Figure 3 This is a cross-sectional structural diagram of the fixed cylinder in the filtration device (Example 1).

[0035] Figure 4 This is a cross-sectional structural diagram of the fixed cylinder in the filtration device (Example 2).

[0036] In the figure: 10 Rotary drum, 11 Annular flange; 20 Fixed cylinder, 21 First cavity, 22 Second cavity, 23 Third cavity, 24 Fourth cavity, 25 Shaft cavity, 26 Connecting pipe, 27 Radial partition, 27.1 Rotary roller, 28 Radial flange, 29 Annular end plate; 30 Slurry nozzle; 40 Washing nozzle, 41 First washing nozzle, 42 Second washing nozzle; 50 Hot air distributor; 60 Scraper; 70 Collection funnel; 80 Transmission unit; 90 Filter cake layer; 100 Inner circumferential surface; 200 Outer circumferential surface. Detailed Implementation

[0037] The structures, proportions, and sizes shown in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0038] like Figures 1 to 3 The rotary drum filter device shown includes a rotary drum 10, a fixed drum 20, a slurry spraying unit (only the slurry nozzle 30 is shown in the figure), a rinsing unit (only the rinsing nozzle 40 is shown in the figure), an air drying unit (only the hot air distributor 50 is shown in the figure), a scraper unit (only the scraper 60 is shown in the figure), a powder collection unit (only the collection funnel 70 is shown in the figure), and a transmission unit 80.

[0039] The rinsing nozzle 40 of the rinsing unit can be selected from existing washing nozzles. The rinsing unit can refer to existing washing devices, and the purpose of both is the same: to perform washing operations on the filter cake (layer). The hot air distributor 50 of the drying unit is connected to a hot air blower through a pipe, which can deliver the hot air generated by the hot air blower to the surface of the filter cake layer 90 attached to the outer wall of the rotating drum 10 to perform air drying operations on the filter cake layer 90, causing the filter cake layer 90 to crack.

[0040] The axis of the rotating drum 10 is set horizontally and pivotally mounted on the frame. The middle part of the side wall of the rotating drum 10 is formed as a screen plate wall. If the mesh count of the screen plate wall is large, a metal mesh can be provided outside the screen plate wall of the rotating drum 10, and a filter cloth can be covered on the metal mesh so that the filter slurry is sprayed onto the filter cloth.

[0041] The axis of the rotating drum 10 can be on a horizontal plane or form a small angle with respect to the horizontal plane. Therefore, the above understanding of the technical feature "the axis of the rotating drum 10 is set in the horizontal direction" should be interpreted broadly.

[0042] The fixed cylinder 20 is coaxially arranged opposite to the rotating cylinder 10 and fixed on the frame, and the outer peripheral surface 200 of the fixed cylinder 20 is in close contact with the inner peripheral surface 100 of the rotating cylinder 10.

[0043] Within the cavity of the fixed cylinder 20, four independent unit cavities are arranged circumferentially, namely, the first cavity 21, the second cavity 22, the third cavity 23, and the fourth cavity 24 shown in the figure. Specifically, an annular cavity is formed on the side wall of the fixed cylinder 20. The front and rear ends of the annular cavity can be sealed by separately provided cover plates, or sealed by the assembly connection structure between it and the rotating cylinder 10 (as shown in the embodiment). Multiple radial baffles 21 are arranged alternately circumferentially within the annular cavity, dividing the annular cavity into four (or five) axially extending unit cavities. Each of the four unit cavities is provided with a connecting pipe 26. The connecting pipe 26 extends radially into the axial cavity 25 of the fixed cylinder 20 and then extends axially to the outside, either connecting to a vacuum pipe and / or a compressed air pipe, or connecting to a fan pipe, to perform corresponding vacuuming or hot air recovery operations.

[0044] The side wall of each unit cavity, i.e. the side wall of the first cavity 21, the side wall of the second cavity 22, the side wall of the third cavity 23, and the side wall of the fourth cavity 24, which are in contact with the drum 10, are provided with a channel structure in communication with the cavity of each unit cavity, so that the screen wall of the drum 10 can be in communication with each unit cavity.

[0045] The cavity of the first cavity 21, the cavity of the second cavity 22, and the cavity of the third cavity 23 are respectively in communication with different vacuum pipes through pipeline structures (communication pipes 26 shown in the figure), so that the cavity of the first cavity 21 can be independently evacuated to extract the liquid in the filter slurry sprayed on the screen wall of the drum 10 corresponding to the first cavity 21, and the filtrate in the filter cake layer 90 can be sucked away to realize the separation of the filtrate and the solid component; the cavity of the second cavity 22 and the cavity of the third cavity 23 can be independently evacuated to extract the elution liquid sprayed in the filter cake layer 90 corresponding to the two unit cavities, respectively, and the elution liquid in the filter cake layer 90 can be sucked away.

[0046] The fourth cavity 24 is connected with the fan pipeline through the communication pipe 26 to realize the purpose of hot air recovery.

[0047] As can be seen from the figure, the extension length of the unit cavity with different functions / design purposes in the circumferential direction is different. The extension length shown in the figure should not be understood as a limitation on the scope of protection of the patent.

[0048] The slurry spraying unit of the slurry spraying head 30 is arranged opposite to the upper left of the drum 10 (corresponding to the case where the rotation direction of the drum 10 is clockwise in the embodiment shown in the figure, if the drum rotates in the counterclockwise direction, the slurry spraying head 30 will be arranged opposite to the upper right of the drum 10), and corresponds to the first cavity 21, so that the filter slurry can be sprayed on the screen wall of the drum 10 at the position corresponding to the first cavity 21. With the rotation of the drum 10, the screen wall area of the drum 10 corresponding to the first cavity 21 will move to the position corresponding to the other unit cavity on the downstream side.

[0049] The elution unit is arranged on the downstream side of the slurry spraying head 30. In the scheme shown in the figure, two elution spraying heads are provided, i.e. the first elution spraying head 41 and the second elution spraying head 42, the first elution spraying head 41 corresponds to the second cavity 22, and the second elution spraying head 42 corresponds to the third cavity 23, so that the filter cake layer 90 attached to the outside of the drum 10 can be eluted with different elution liquids, respectively.

[0050] Mostly, the slurry spraying head 30 and the rinsing spraying head 40 are arranged above the rotary drum 10 (including the upper position, the left upper position and the right upper position, etc.).

[0051] The hot air distributor of the air drying unit is arranged at the downstream side of the rinsing unit, and can blow hot air to the filter cake layer 90 attached to the outer wall of the rotary drum 10 to perform drying operation on the filter cake layer 90. In the illustrated scheme, the air outlet of the hot air distributor 50 is arc-shaped, and can uniformly send hot air to the filter cake layer 90 at the lower right position of the rotary drum 10, so that the filter cake layer 90 receives air drying treatment in this area. At the position corresponding to the fixed cylinder 20, the fourth cavity 24 is arranged on the fixed cylinder 20 to recycle hot air. The side wall of the fourth cavity 24 in contact with the rotary drum 10 is provided with a channel structure, so that the cavity of the fourth cavity 24 can be in communication with the sieve plate wall of the rotary drum 10, and the hot air blown on the filter cake layer 90 is sucked into the cavity of the fourth cavity 24 through the mesh holes of the sieve plate wall of the rotary drum 10 for recycling and energy saving.

[0052] The scraper 60 of the scraper unit is arranged below the rotary drum 10 and at the downstream side of the hot air distributor 50, and can scrape the filter cake layer 90 attached to the outer wall of the rotary drum 10 from the rotary drum 10.

[0053] The collecting funnel 70 of the powder collecting unit is arranged below the scraper 60, and is used to collect the filter cake powder scraped from the rotary drum 10 by the scraper 60. The collecting funnel 70 in the illustrated scheme can be replaced by a guide plate, a conveyor belt, etc.

[0054] The transmission unit 80 is matched with the rotary drum 10, and can drive the rotary drum 10 to rotate in the clockwise direction. In the illustrated scheme, the annular flange 11 extending radially outward is formed at the end of the rotary drum 10, and the outer rear surface of the annular flange 11 is formed as a gear surface to engage with the transmission gear of the transmission unit 80.

[0055] The speed of the rotary drum 10 driven by the transmission unit 80 to rotate around the horizontal axis should not be too large, and slow rotation is preferred. The centrifugal force should not be too large to cause the filter slurry to be thrown out of the outer wall of the rotary drum 10, or to cause the vacuum suction force to be significantly increased, so that the energy consumption is increased.

[0056] Embodiment one: as Figure 3As shown, an inwardly extending radial flange 28 is provided at the port of the fixed cylinder 20, and the radial flange 28 is annular. Simultaneously, an annular end plate 29 is provided at the port of the fixed cylinder 20. Threaded holes are provided on both edges of the annular end plate 29, allowing bolts to be used to fix the annular end plate 29 to the radial flanges 28 on both sides, thereby sealing the ports of each unit cavity of the fixed cylinder 20 and forming multiple independent unit cavities. Each unit cavity on the fixed cylinder 20 can also be an integrally formed structure with the body of the fixed cylinder 20.

[0057] Example 2: Figure 4 As shown, the outer side of each unit cavity has an open structure (i.e., an open channel structure, forming a long, narrow slot). After the fixed cylinder 20 is inserted into the rotating cylinder 10, the inner circumferential surface 100 of the rotating cylinder 10 can seal the open slots on the outer side of each unit cavity, thus forming a cavity. Simultaneously, at least at the edge of each unit cavity, a rotating roller 27.1 is provided, and the roller surface of the rotating roller 27.1 can form a sealed contact with the inner circumferential surface 100 of the rotating cylinder 10. As the rotating cylinder 10 rotates, the rotating roller 27.1 can rotate relative to the inner circumferential surface 100, thereby reducing the relative frictional resistance when the rotating cylinder 10 rotates relative to the fixed cylinder 20, which not only reduces energy consumption but also reduces wear between the contact surfaces.

[0058] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit it. Many aspects of this utility model can be improved without departing from the overall concept. Those skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A drum filter apparatus, characterised in that, The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device.

2. A drum filter apparatus according to claim 1, characterised in that: The application relates to a filter cake drying device.

3. A drum filter apparatus according to claim 1, characterised in that: The application relates to a filter cake drying device.

4. The drum filter apparatus according to claim 1, characterized in that: The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device.

5. The drum filter apparatus according to claim 1, characterized in that: The application relates to a filter cake drying device. The application relates to a filter cake drying device.

6. A drum filter apparatus according to any one of claims 1 to 5, characterised in that: The application relates to a filter cake drying device.

7. A drum filter apparatus, characterised in that, The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. The application relates to a filter cake drying device. 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The application relates to a filter cake drying The slurry spraying unit is arranged opposite to the upper left of the rotary drum and matches the hole structure at one end of the annular cavity, and can spray the filter cake on the screen wall of the rotary drum; The washing unit is arranged opposite to the downstream side of the slurry spraying unit and matches one or more hole structures, and can wash the filter cake layer sprayed on the outer surface of the rotary drum; The air drying unit is arranged opposite to the downstream side of the washing unit, can blow hot air to the filter cake layer adhered to the outer surface of the rotary drum, and implements the drying operation; The scraper unit is arranged opposite to the lower left or right of the rotary drum and at the downstream side of the air drying unit, can scrape the filter cake layer adhered to the outer surface of the rotary drum from the rotary drum; The powder collecting unit is arranged below the scraper unit and is used to collect the filter cake powder scraped from the rotary drum; The transmission unit matches the rotary drum and can drive the rotary drum to rotate in the clockwise direction.

8. A drum filter apparatus according to claim 7, characterised in that: The air drying unit matches at least one hole structure arranged on the fixed cylinder and arranged opposite to the downstream side of the washing unit; The hole structure matched with the air drying unit is individually communicated with the fan pipeline or the compressor pipeline, and can suck the hot air blown on the rotary drum into the fan pipeline or the compressor pipeline.

9. A drum filter apparatus, characterised in that, The slurry spraying unit is arranged opposite to the upper left of the rotary drum and matches the hole structure at one end of the annular cavity, and can spray the filter cake on the screen wall of the rotary drum; The transmission unit matches the rotary drum and can drive the rotary drum to rotate in the clockwise direction. The slurry spraying unit is arranged opposite to the upper left of the rotary drum and matches the hole structure at one end of the annular cavity, and can spray the filter cake on the screen wall of the rotary drum; The transmission unit matches the rotary drum and can drive the rotary drum to rotate in the clockwise direction. ​ 10. A drum filter apparatus, characterised in that, ​ ​ ​ ​ ​

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