Rotary drum type filtering device

Abstract

The invention relates to a rotary drum type filtering device, which comprises a rotary drum, a filtering device and a filtering device, 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 invention relates to the technical field of filtering equipment, and in particular to a rotary drum filtering device capable of separating solid and liquid in slurry. Background Art

[0002] Filtering equipment is a mechanical device or device used for filtering, and is a common general-purpose equipment in industrial production. Filtering equipment is generally divided into two categories: vacuum and pressurized. Common vacuum types include drums, discs, horizontal belts, etc., and pressurized types include filter presses, squeezers, dynamic filters, and rotary types.

[0003] The rotary drum vacuum filter is the most widely used continuous operation filtering equipment in industry. The main body of this filtering equipment is a rotating cylinder. The cylinder cavity of the cylinder is divided into several fan-shaped cavities along the radial direction. Each fan-shaped cavity has a separate channel / pipeline connected to the external equipment. These channels / pipelines are connected to the vacuum pipe and the compressed air pipe in turn through the distribution head. When the cylinder rotates, the lower part of the cylinder is immersed in the filter slurry pool. Therefore, during the process of the cylinder rotating one circle, each fan-shaped cavity surface can be filtered, washed, sucked dry, blown loose, unloaded cakes and other operations in sequence. When part of the fan-shaped cavity begins to immerse in the filter slurry, the corresponding channel on the cylinder / rotating drum is connected to the vacuum pipe to absorb the filtrate. After the part of the fan-shaped cavity is rotated out of the filter slurry tank, it is still connected to the vacuum pipe to continue to absorb the filtrate remaining in the filter cake. As the cylinder rotates, the part of the fan-shaped cavity turns to the washing spraying area to spray washing water on the filter cake. At this time, the part of the fan-shaped cavity absorbs the washing water through other vacuum pipes. When the cylinder is rotated out of the washing area, the sector cavity corresponds to a position that is not connected to any pipeline, and this position is called the non-working area. A cutter is provided at the end of the non-working area to cut off the filter cake solidified on the surface of the cylinder. Therefore, when the sector cavity on the cylinder is transferred from one area to another, the existence of the non-working area prevents the operating areas from being connected to each other.

[0004] The existing rotary drum vacuum filtration device needs to insert the drum into the filter slurry pool, which not only encounters relatively large resistance when the drum rotates, resulting in relatively high energy consumption, but also limits the degree to which the filtrate is sucked away. In addition, the channels / 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, and the structure is relatively complex, and the failure rate is relatively high. Summary of the invention

[0005] The present invention provides a rotary drum filter device, which sprays the slurry / filter slurry on the sieve plate wall of the rotary drum, and through the vacuum chamber connected to the sieve plate wall, successively implements the steps of slurry suction and cleaning on the slurry attached to the surface of the rotary drum to complete the filtering operation. Compared with the existing rotary drum vacuum filter device, this patent does not require the rotary drum to be immersed in the slurry pool, but can significantly reduce the resistance encountered by the rotary drum during rotation, and can reduce energy consumption. In addition, the multiple independent chambers divided on the fixed drum correspond to different positions of the sieve plate wall as the rotary drum rotates, so it is no longer necessary to set up related structures such as distribution heads, which can simplify the overall structure and reduce the failure rate.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a rotary drum filter device, comprising:

[0007] 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 plate wall;

[0008] A fixed cylinder is coaxially arranged opposite to the rotating cylinder and fixed on the frame; the outer circumference of the fixed cylinder contacts the inner circumference of the rotating cylinder; a plurality of independent unit cavities are arranged in the cylinder cavity of the fixed cylinder around the circumference; a channel structure connected with the mold cavity of the unit cavity is formed on the wall surface of one side of the unit cavity in contact with the rotating cylinder; the mold cavity of the unit cavity is connected with the vacuum tube through the pipeline structure;

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

[0010] A washing unit is arranged at the downstream side of the slurry spraying unit and corresponds to another one or more unit cavities, and can wash the filter cake layer attached to the outside of the drum;

[0011] An air drying unit is arranged at the downstream side of the rinsing unit and can blow hot air to the filter cake layer attached to the outside of the drum to perform a drying operation;

[0012] A scraper unit is relatively arranged at the lower left or lower right of the drum and at the downstream side of the air drying unit, and can scrape the filter cake layer attached to the outside of the drum from the drum;

[0013] A powder collecting unit is relatively arranged below the scraper unit and is used to collect filter cake powder scraped from the rotating drum;

[0014] And a transmission unit matched with the rotating drum can drive the rotating drum to rotate in a clockwise direction.

[0015] Optionally, there are multiple unit cavities corresponding to the elution unit and the multiple unit cavities are arranged in sequence around the circumferential direction, and each unit cavity is respectively configured with an elution nozzle to perform elution treatment on the filter cake layer attached to the drum that moves to the outer side of the radial corresponding position of each unit cavity. The elution liquids sprayed by the elution nozzles configured corresponding to different unit cavities may be partially the same or completely different.

[0016] Optionally, an annular flange extending radially outward is provided at the port of the drum, the outer peripheral surface of the annular flange is formed as a tooth surface, and the output gear of the transmission unit meshes with the tooth surface on the annular flange.

[0017] Optionally, one side of the unit cavity facing the inner circumference of the drum is an open slot and the slot extends in the axial direction. At least rollers are provided at both ends of the slot of the unit cavity and the axial extension direction of the rollers is parallel to the axial extension direction of the fixed drum. After the fixed drum is sleeved inside the drum, the roller surface of the roller can be in sealing contact with the inner circumference of the drum. When the drum rotates, the contact friction between the inner circumference of the drum and the roller surface of the roller can drive the 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 connected with a fan duct or a compressor duct, and the hot air blown outside the drum can be sucked into the unit cavity to achieve the purpose of recycling the hot air.

[0019] Optionally, a metal mesh is provided outside the sieve plate wall of the drum and the metal mesh is covered with filter cloth.

[0020] This patent also relates to a rotary drum filter device, which includes:

[0021] The rotary drum has an axis line arranged 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;

[0022] The fixed cylinder is coaxially arranged opposite to the rotating cylinder and fixed on the frame; the outer circumference of the fixed cylinder contacts the inner circumference of the rotating cylinder; an annular cavity is formed on the fixed cylinder, and a plurality of channel structures distributed sequentially around the circumference are formed on a side wall of the annular cavity in contact with the rotating cylinder; the annular cavity is connected to an external vacuum tube through a pipeline structure;

[0023] The slurry spraying unit is relatively arranged on the upper left of the drum and corresponds to the channel structure at one end of the annular cavity, and can spray the filter slurry on the screen plate wall of the drum;

[0024] The washing unit is relatively arranged at the downstream side of the slurry spraying unit and is matched with one or more pore structures, and can wash the filter cake layer sprayed on the outside of the drum;

[0025] The air drying unit is arranged at the downstream side of the elution unit, and can blow hot air to the filter cake layer attached to the outside of the drum to implement the drying operation;

[0026] The scraper unit is relatively arranged at the lower left or lower right of the drum and at the downstream side of the air drying unit, and can scrape the filter cake layer attached to the outside of the drum from the drum;

[0027] The powder collecting unit is relatively arranged below the scraper unit and is used to collect the filter cake powder scraped from the rotating drum;

[0028] And a transmission unit, matched with the rotating drum, can drive the rotating drum to rotate in a clockwise direction.

[0029] The multiple channel structures distributed around the circumference of the fixed cylinder can all be opposite to the sieve plate wall on the rotating cylinder, so that the channels on the sieve plate wall can establish a communication relationship with the annular cavity of the fixed cylinder through each channel structure (provided on the fixed cylinder), and then be connected with the annular cavity of the fixed cylinder through a vacuum tube through an external vacuum device, and a suction force can be formed at each channel structure to suck the filtrate or eluent in the filter cake layer corresponding to the radial outside of each channel structure into the annular cavity of the fixed cylinder, thereby achieving the operation purpose of extracting the filtrate or eluent.

[0030] Therefore, at least one or more channel structures should be provided on the fixed cylinder corresponding to the setting positions of the slurry spraying unit and the rinsing unit to establish a circulation channel for sucking the filtrate or the rinsing liquid into the annular cavity on the fixed cylinder. In order to recover the hot air blown by the air-drying unit and reduce energy loss, one or more channel structures can also be provided on the fixed cylinder corresponding to the setting position of the air-drying unit to suck the hot air blown onto the filter cake layer on the outer surface of the rotating cylinder into the annular cavity. Each channel structure provided on the fixed cylinder extends along the axial distribution of the fixed cylinder, and each channel structure can be distributed in a continuous connection or in an alternating manner in the circumferential direction.

[0031] The beneficial effects of the present invention are as follows: the rotary drum filter device provided by the present invention sprays the slurry / filter slurry on the sieve plate wall of the rotary drum, and then successively performs slurry suction, cleaning and other processing steps on the slurry attached to the surface of the rotary drum through the vacuum chamber connected to the sieve plate wall, that is, the above-mentioned unit chamber or annular chamber, to complete the filtering operation. Compared with the existing rotary drum vacuum filter device, the present patent does not require the rotary drum to be immersed in the slurry pool, but can significantly reduce the resistance encountered by the rotary drum during rotation, and can relatively reduce energy consumption. In addition, the multiple independent chambers / units formed by segmentation on the fixed drum correspond to different positions of the sieve plate wall as the rotary drum rotates, so it is no longer necessary to set up related structures such as distribution heads, which can greatly simplify the overall structure and significantly reduce the failure rate of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the assembly structure of the filtering device.

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the drum in the filtering device.

[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of a fixed cylinder in a filtering device (Example 1).

[0035] Figure 4 It is a schematic diagram of the cross-sectional structure of the fixed cylinder in the filtering device (Example 2).

[0036] In the figure: 10 rotating drum, 11 annular flange;

[0037] 20 fixed cylinder, 21 first cavity, 22 second cavity, 23 third cavity, 24 fourth cavity, 25 shaft cavity, 26 connecting pipe, 27 radial partition plate, 27.1 rotating roller, 28 radial flange, 29 annular end plate;

[0038] 30 slurry nozzle; 40 rinsing nozzle, 41 first rinsing nozzle, 42 second rinsing nozzle; 50 hot air distributor;

[0039] 60 scraper; 70 collecting funnel; 80 transmission unit; 90 filter cake layer; 100 inner circumference; 200 outer circumference. DETAILED DESCRIPTION

[0040] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0041] like Figures 1 to 3 A rotary drum filtering device is shown, comprising 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 collecting unit (only the collecting funnel 70 is shown in the figure) and a transmission unit 80.

[0042] The rinsing nozzle 40 of the rinsing unit can be selected from existing washing nozzles. The rinsing unit can refer to the existing washing device, and the purpose of both is the same, that is, to wash the filter cake (layer). The hot air distributor 50 of the air drying unit is connected to the hot air blower through a pipeline, and can send 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, so as to perform air drying on the filter cake layer 90 and cause the filter cake layer 90 to crack.

[0043] The axis of the drum 10 is arranged horizontally and pivotally arranged on the frame. The middle part of the side wall of the drum 10 is formed as a screen wall. If the mesh number of the screen wall is large, a metal mesh can be arranged outside the screen wall of the drum 10 and the metal mesh can be covered with a filter cloth so that the filter slurry is sprayed on the filter cloth.

[0044] The axis of the rotating drum 10 may be on a horizontal plane, or may form a small angle relative to the horizontal plane. Therefore, the above-mentioned understanding of the technical feature "the axis of the rotating drum 10 is arranged along the horizontal direction" should be interpreted in an expanded manner.

[0045] The fixed cylinder 20 is coaxially disposed opposite to the rotating cylinder 10 and fixed on a frame, and an outer peripheral surface 200 of the fixed cylinder 20 is in close contact with an inner peripheral surface 100 of the rotating cylinder 10 .

[0046] In the cylinder cavity of the fixed cylinder 20, four independent unit cavities are distributed around the circumferential direction, 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, and the front and rear ends of the annular cavity can be blocked by a separately arranged cover plate, or the blocking can be achieved by means of an assembly connection structure with the rotating cylinder 10 (as shown in the embodiment shown in the figure). In the annular cavity, a plurality of radial partitions 21 are alternately arranged around the circumferential direction, dividing the annular cavity into four (also understood as five) unit cavities extending in the axial direction. The four unit cavities formed by the division are respectively provided with a connecting pipe 26, which extends radially into the axial cavity 25 of the fixed cylinder 20 and then extends axially to the outside or is connected to the vacuum pipe and / or the compressed air pipe, or is connected to the fan pipe, so as to implement the corresponding vacuuming or hot air recovery operation purpose.

[0047] On the side walls of each unit cavity, that is, on the side wall surface of the first cavity 21 in contact with the rotating drum 10, on the side wall surface of the second cavity 22 in contact with the rotating drum 10, on the side wall surface of the third cavity 23 in contact with the rotating drum 10, and on the side wall surface of the fourth cavity 24 in contact with the rotating drum 10, a channel structure connected with the mold cavity of each unit cavity is formed, so that the screen plate wall of the rotating drum 10 can establish a connecting relationship with each unit cavity.

[0048] The cavity of the first cavity 21, the cavity of the second cavity 22, and the cavity of the third cavity 23 are connected to different vacuum tubes through pipeline structures (the connecting pipe 26 shown in the figure), and the cavity of the first cavity 21 can be vacuumed separately to extract the liquid in the filter slurry sprayed on the screen plate wall of the drum 10 corresponding to the first cavity 21, and suck out the filtrate in the filter cake layer 90 to separate the filtrate from the solid components; the cavity of the second cavity 22 and the cavity of the third cavity 23 can be vacuumed separately to extract the eluent sprayed in the filter cake layer 90 corresponding to the two unit cavities, and suck out the eluent in the filter cake layer 90.

[0049] The fourth chamber 24 is connected to the fan pipeline through the connecting pipe 26 to implement the purpose of hot air recovery.

[0050] As can be seen from the figure, the extension lengths of the unit cavities with different functions / design purposes around the circumference are different. The extension lengths shown in the figure should not be understood as limiting the scope of protection of this patent.

[0051] The slurry spraying unit's slurry spraying head 30 is relatively arranged at the upper left of the drum 10 (adapting to the situation that the rotation direction of the drum 10 is set to be clockwise in the illustrated embodiment, if the drum rotates counterclockwise, the slurry spraying head 30 is correspondingly arranged at the upper right of the drum 10), and corresponds to the first cavity 21, and can spray the filter slurry on the sieve wall of the drum 10 at the corresponding position of the first cavity 21. As the drum 10 rotates, the sieve wall area of ​​the drum 10 corresponding to the first cavity 21 will move to the corresponding position of other unit cavities on the downstream side.

[0052] The rinsing nozzle 40 of the rinsing unit is relatively arranged at the downstream side of the slurry nozzle 30. In the illustrated scheme, two rinsing nozzles are arranged, namely a first rinsing nozzle 41 and a second rinsing nozzle 42, the first rinsing nozzle 41 corresponds to the second cavity 22, and the second rinsing nozzle 42 corresponds to the third cavity 23, and can respectively rinse the filter cake layer 90 attached to the outside of the drum 10 with different rinsing liquids.

[0053] In most cases, the slurry nozzle 30 and the rinse nozzle 40 are relatively arranged above the rotating drum 10 (including spatial areas such as the directly above, the upper left and the upper right).

[0054] The hot air blower 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 outside of the drum 10, so as to dry the filter cake layer 90. In the illustrated scheme, the air outlet of the hot air blower 50 is arc-shaped, and can evenly send hot air to the filter cake layer 90 that rotates to the lower right position with the drum 10, so that the filter cake layer 90 is air-dried in this area. At the position of the fixed drum 20 corresponding to the hot air blower 50, the fourth cavity 24 is arranged on the fixed drum 20 to recycle the hot air. A channel structure is formed on the side wall of the fourth cavity 24 that contacts the drum 10, so that the cavity of the fourth cavity 24 can establish a communication relationship with the sieve plate wall on the 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 of the sieve plate wall of the drum 10 for recycling and utilization, thereby achieving the purpose of energy saving.

[0055] The scraper 60 or scraper of the scraper unit is relatively arranged at the lower left of the drum 10 and at the downstream side of the hot air distributor 50 , and can scrape the filter cake layer 90 attached to the outside of the drum 10 off the drum 10 .

[0056] The collecting funnel 70 of the powder collecting unit is relatively arranged below the scraper 60, and is used to collect the filter cake powder scraped off the drum 10 by the scraper 60. The collecting funnel 70 shown in the figure can be replaced by a guide plate, a conveyor belt, etc.

[0057] The transmission unit 80 matches the drum 10 and can drive the drum 10 to rotate clockwise. In the illustrated embodiment, an annular flange 11 extending radially outward is formed at the end of the drum 10, and the outer rear surface of the annular flange 11 is formed as a gear surface to mesh with the transmission gear of the transmission unit 80.

[0058] The transmission unit 80 should not drive the drum 10 to rotate around the horizontal axis at a too high speed, and can rotate slowly. It should be avoided that the centrifugal force is too large to cause the filter pulp to be thrown out from the outer wall of the drum 10, or the vacuum suction force required to be provided becomes significantly larger, which increases energy consumption.

[0059] Embodiment 1: Figure 3 As shown, a radial flange 28 extending inward is provided at the port of the fixed cylinder 20, and the radial flange 28 is annular. At the same time, an annular end plate 29 is provided at the port of the fixed cylinder 20. Threaded holes are provided at the two edges of the annular end plate 29, and the annular end plate 29 can be fixedly connected with the radial flanges 28 on both sides by bolts, so that the ports of each unit cavity of the fixed cylinder 20 are blocked to form multiple independent unit cavities. Each unit cavity on the fixed cylinder 20 can also be a structure integrally formed with the body of the fixed cylinder 20.

[0060] Embodiment 2: Figure 4 As shown, the outside of each unit cavity is an open structure (i.e., an open channel structure, formed as a long strip of slots). After the fixed cylinder 20 is installed in the rotating cylinder 10, the inner circumference 100 of the rotating cylinder 10 can block the open slots on the outside of each unit cavity to form a cavity. At the same time, at least a roller 27.1 is provided at the edge of each unit cavity, and a sealing contact can be formed between the roller surface of the roller 27.1 and the inner circumference 100 of the rotating cylinder 10. As the rotating cylinder 10 rotates, the roller 27.1 can rotate relative to the inner circumference 100, thereby reducing the relative friction resistance when the rotating cylinder 10 rotates relative to the fixed cylinder 20, which can not only reduce energy consumption but also reduce the wear between the contact surfaces.

[0061] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A rotary drum filter device, characterized in that: include: The rotary drum has an axis line arranged 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; The fixed cylinder is coaxially arranged opposite to the rotating cylinder and fixed on the frame; the outer circumference of the fixed cylinder contacts the inner circumference of the rotating cylinder; a plurality of independent unit cavities are arranged in the cylinder cavity of the fixed cylinder around the circumference, and a channel structure is formed on the wall surface of one side of the unit cavity in contact with the rotating cylinder; the cavities of the unit cavities are respectively connected with the vacuum tubes through the pipeline structure; The slurry spraying unit is relatively arranged at the upper left of the drum and corresponds to at least one unit cavity, and can spray the filter slurry on the screen plate wall of the drum at the corresponding position of the unit cavity; The washing unit is arranged at the downstream side of the slurry spraying unit and corresponds to another one or more unit cavities, and can wash the filter cake layer sprayed on the outside of the drum; The air drying unit is arranged at the downstream side of the elution unit, and can blow hot air to the filter cake layer attached to the outside of the drum to implement the drying operation; The scraper unit is relatively arranged at the lower left or lower right of the drum and at the downstream side of the air drying unit, and can scrape the filter cake layer attached to the outside of the drum from the drum; The powder collecting unit is relatively arranged below the scraper unit and is used to collect the filter cake powder scraped from the rotating drum; and a transmission unit, which is matched with the rotating drum and can drive the rotating drum to rotate in a clockwise direction.

2. The rotary drum filter device according to claim 1, characterized in that: There are a plurality of unit cavities corresponding to the rinsing unit, and the plurality of unit cavities are arranged in sequence around the circumferential direction, and a rinsing nozzle is respectively configured corresponding to each unit cavity.

3. The rotary drum filter device according to claim 1, characterized in that: An annular flange extending radially outward is provided at the port of the drum; the outer peripheral surface of the annular flange is formed as a tooth surface and the output gear of the transmission unit is meshed with the tooth surface on the annular flange.

4. The rotary drum filter device according to claim 1, characterized in that: The side of the unit cavity facing the inner circumference of the drum is an open slot and the slot extends in the axial direction; At least two ends of the notch of the unit cavity are provided with rollers, and the axial extension direction of the rollers is parallel to the axial extension direction of the fixed cylinder; After the fixed cylinder is sleeved in the rotating cylinder, the roller surface of the rotating roller can be in sealing contact with the inner circumferential surface of the rotating cylinder; 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.

5. The rotary drum filter device according to claim 1, characterized in that: The air-drying unit is matched with at least one unit cavity arranged on the downstream side of the rinsing unit; The unit cavity corresponding to the air-drying unit is connected to a fan duct or a compressor duct, which can suck the hot air blown on the rotating drum into this part of the unit cavity.

6. The drum filter device according to any one of claims 1 to 5, characterized in that: A metal mesh is arranged outside the screen plate wall of the rotating drum and the metal mesh is covered with filter cloth.

7. A rotary drum filter device, characterized in that: include: The rotary drum has an axis line arranged 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; The fixed cylinder is coaxially arranged opposite to the rotating cylinder and fixed on the frame; the outer circumference of the fixed cylinder contacts the inner circumference of the rotating cylinder; an annular cavity is formed on the fixed cylinder, and a plurality of channel structures distributed sequentially around the circumference are formed on a side wall of the annular cavity in contact with the rotating cylinder; the annular cavity is connected to an external vacuum tube through a pipeline structure; The slurry spraying unit is relatively arranged on the upper left of the drum and corresponds to the channel structure at one end of the annular cavity, and can spray the filter slurry on the screen plate wall of the drum; The washing unit is relatively arranged at the downstream side of the slurry spraying unit and is matched with one or more pore structures, and can wash the filter cake layer sprayed on the outside of the drum; The air drying unit is arranged at the downstream side of the elution unit, and can blow hot air to the filter cake layer attached to the outside of the drum to implement the drying operation; The scraper unit is relatively arranged at the lower left or lower right of the drum and at the downstream side of the air drying unit, and can scrape the filter cake layer attached to the outside of the drum from the drum; The powder collecting unit is relatively arranged below the scraper unit and is used to collect the filter cake powder scraped from the rotating drum; and a transmission unit, which is matched with the rotating drum and can drive the rotating drum to rotate in a clockwise direction.

8. The rotary drum filter device according to claim 7, characterized in that: The air drying unit is matched with at least one channel structure provided on the fixed cylinder and provided on the downstream side of the rinsing unit; The hole structure corresponding to the air-drying unit is independently connected to a fan duct or a compressor duct, so that the hot air blown onto the rotating drum can be sucked into the fan duct or the compressor duct.

9. A rotary drum filter device, characterized in that: include: The rotary drum has an axis line arranged 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; The fixed cylinder is coaxially arranged opposite to the rotating cylinder and fixed on the frame; the outer circumference of the fixed cylinder contacts the inner circumference of the rotating cylinder; a plurality of independent unit cavities are arranged in the cylinder cavity of the fixed cylinder around the circumference, and a channel structure is formed on the wall surface of one side of the unit cavity in contact with the rotating cylinder; the cavities of the unit cavities are respectively connected with the vacuum tubes through the pipeline structure; The slurry spraying unit is relatively arranged at the upper left of the drum and corresponds to at least one unit cavity, and can spray the filter slurry on the screen plate wall of the drum at the corresponding position of the unit cavity; and a transmission unit, which is matched with the rotating drum and can drive the rotating drum to rotate in a clockwise direction.

10. A rotary drum filter device, characterized in that: include: The rotary drum has an axis line arranged 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; The fixed cylinder is coaxially arranged opposite to the rotating cylinder and fixed on the frame; the outer circumference of the fixed cylinder contacts the inner circumference of the rotating cylinder; an annular cavity is formed on the fixed cylinder, and a plurality of channel structures distributed sequentially around the circumference are formed on a side wall of the annular cavity in contact with the rotating cylinder; the annular cavity is connected to an external vacuum tube through a pipeline structure; The slurry spraying unit is relatively arranged on the upper left of the drum and corresponds to the channel structure at one end of the annular cavity, and can spray the filter slurry on the screen plate wall of the drum; and a transmission unit, which is matched with the rotating drum and can drive the rotating drum to rotate in a clockwise direction.

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