Pre-filtering device of centrifugal machine

Abstract

The pre-filtering device comprises a rack, the centrifugal machine is arranged on the rack, a mounting cylinder is arranged on the rack, one end of the mounting cylinder is connected with the centrifugal machine, a filter cylinder is rotationally mounted in the mounting cylinder, a feeding pipe communicated with the interior of the filter cylinder is arranged at the end, away from a feeding pipe, of the mounting cylinder, and spiral blades are rotationally mounted on the inner side of the filter cylinder; a driving part is arranged on the mounting cylinder, and a recycling box communicating with the interior of the mounting cylinder is arranged on the rack; materials enter the filter cylinder through the feeding pipe, the driving piece drives the spiral blade to rotate to convey the materials, the materials make contact with the filter cylinder to be filtered, filtered liquid is conveyed to the recycling box to be collected, the spiral blade conveys the materials, then the materials enter the centrifugal machine to be subjected to centrifugal operation, and the materials are filtered once before centrifugal operation; the centrifugal machine has the advantages that the water content of materials is low, and the time needed by centrifugation is shortened.

Description

Technical Field

[0001] This application relates to the field of centrifuges, and more particularly to a pre-filtration device for centrifuges. Background Technology

[0002] In a water washing kettle, the semi-finished tetrachlorophthalic anhydride is washed multiple times with cold water to remove free acid. The washed solid material is then centrifuged and dried in a dryer to form the final product for packaging.

[0003] In related technologies, please refer to the invention patent with announcement number CN104668112B, which discloses a material distribution device in a bottom discharge centrifuge, including a base, a main shaft, a rotating drum, and a feed pipe. The material distribution device is located in the inner cavity of the rotating drum and includes an upper baffle cone ring, a material distribution cone, and a material distribution inclined plate. The upper baffle cone ring is provided with a feeding chamber communicating with the feed pipe. The material distribution device also includes an upper positioning ring and a lower positioning ring. The upper positioning ring is sleeved on the outer circumferential surface of the upper baffle cone ring, and the lower positioning ring is sleeved on the material distribution cone or the main shaft. Through this material distribution device, the material is evenly thrown into the rotating drum, reducing the amount of material flying out from the upper and lower ends of the rotating drum and improving the material utilization rate.

[0004] In the aforementioned technologies, the high moisture content of the material during centrifugation results in a long centrifugation time and low centrifugation efficiency. Summary of the Invention

[0005] To address the problem of high material moisture content during centrifugation leading to long centrifugation times and low operating efficiency, this application provides a pre-filtration device for centrifuges.

[0006] The pre-filtration device for a centrifuge provided in this application adopts the following technical solution: A pre-filtration device for a centrifuge includes a frame, a centrifuge mounted on the frame, an mounting cylinder on the frame, one end of the mounting cylinder being connected to the feed pipe of the centrifuge, a filter cartridge for filtering water from materials being rotatably mounted inside the mounting cylinder, a feeding pipe being provided at the end of the mounting cylinder opposite to the feed pipe, the feeding pipe communicating with the interior of the filter cartridge, a spiral blade for propelling material transport being rotatably mounted on the mounting cylinder located inside the filter cartridge, a driving component for driving the spiral blade to rotate being provided on the mounting cylinder, and a recovery box being provided on the frame, the recovery box communicating with the interior of the mounting cylinder via a water pipe.

[0007] By adopting the above technical solution, the material enters the filter cartridge through the feeding pipe, and the driving component drives the spiral blades to rotate to transport the material. During the transportation process, the material comes into contact with the filter cartridge for filtration. The filtered liquid is transported to the recycling tank for collection through the water pipe. The filtered material is then transported to the feeding pipe through the spiral blades and then enters the centrifuge for centrifugation. The material is filtered once before centrifugation, resulting in a lower water content and reducing the centrifugation time.

[0008] Optionally, a rotating ring is rotatably mounted on the mounting cylinder. The rotating ring is coaxially distributed with the mounting cylinder. The end of the filter cylinder is connected to the rotating ring. The rotating ring is rotatably connected to the spiral blade. When the driving component drives the spiral blade to rotate, the rotating ring rotates synchronously with the spiral blade.

[0009] By adopting the above technical solution, when the moving part drives the spiral blade to rotate, the rotating ring rotates synchronously with the spiral blade, thereby driving the filter cartridge to rotate, so that the material is filtered more thoroughly in the filter cartridge and the filtration effect is improved.

[0010] Optionally, the driving component includes a drive motor, a first gear, a second gear, a third gear, and a gear ring. The gear ring is coaxially disposed on one side of the rotating ring. The drive motor is disposed at the end of the mounting cylinder. The first gear is coaxially disposed at the output shaft of the drive motor. An outer gear ring is disposed on the outer circumferential wall of the gear ring. The first gear meshes with one side of the outer gear ring of the gear ring. A rotating shaft is coaxially rotatably mounted in the mounting cylinder. The helical blade is disposed on the rotating shaft. The second gear is coaxially disposed at one end of the rotating shaft. The third gear is rotatably mounted at one end of the mounting cylinder. One side of the third gear meshes with one side of the second gear. An inner gear ring is disposed on the inner circumferential wall of the gear ring. The side of the third gear away from the second gear meshes with the inner gear ring of the gear ring.

[0011] By adopting the above technical solution, the drive motor drives the first gear to rotate, the first gear drives the gear ring to rotate through the meshing outer gear ring, the gear ring drives the rotating ring to rotate, and at the same time the inner gear ring of the gear ring drives the meshing third gear to rotate, the third gear drives the second gear to rotate, and then drives the rotating shaft to rotate, driving the spiral blades to rotate synchronously in opposite directions with the filter cartridge, ensuring that the material is conveyed and filtered in the filter cartridge.

[0012] Optionally, a scraper is provided on the rotating ring, the scraper is distributed along the length of the mounting cylinder, one side of the scraper is in contact with the inner peripheral wall of the mounting cylinder, a cleaning roller is rotatably installed inside the mounting cylinder, cleaning bristles are provided on the outer peripheral wall of the cleaning roller, the cleaning bristles are in contact with the outer peripheral wall of the filter cartridge, and the cleaning brush is connected to the scraper through a connector.

[0013] By adopting the above technical solution, when the rotating ring rotates, it drives the scraper to rotate. The scraper cleans the inner peripheral wall of the installation cylinder, reducing the adhesion of some of the sedimented material. At the same time, the scraper drives the cleaning roller to rotate through the connecting part. The cleaning brush on the cleaning roller cleans the outer peripheral wall of the filter cylinder simultaneously, reducing filter cylinder clogging.

[0014] Optionally, the connector includes a connecting gear ring and a connecting gear. The connecting gear ring is rotatably installed inside the mounting cylinder. The scraper is connected to the connecting gear ring. The connecting gear is coaxially connected to the cleaning roller and meshes with the connecting gear ring.

[0015] By adopting the above technical solution, the scraper rotates with the rotating ring, and through the cooperation of the connecting gear ring and the connecting gear, the cleaning roller is driven to rotate synchronously. The cleaning brush on the cleaning roller cleans the outer peripheral wall of the filter cartridge, and the synchronous drive operation is convenient.

[0016] Optionally, a scraper is provided on the rotating shaft, the scraper is distributed along the length of the filter cartridge, the scraper is in contact with the inner peripheral wall of the filter cartridge, the scraper slides along the radius of the rotating shaft section, and an elastic element is provided on the rotating shaft for pushing the scraper to slide.

[0017] By adopting the above technical solution, when the rotating shaft rotates, the scraper on the rotating shaft scrapes the material on the inner peripheral wall of the filter cartridge, reducing the material adhering to the inner peripheral wall of the filter cartridge and affecting the filtration effect. The scraper slides along the radius of the rotating shaft section, and the elastic element pushes the scraper to slide, so that the scraper always maintains good contact with the inner peripheral wall of the filter cartridge, thereby enhancing the scraping effect.

[0018] Optionally, the elastic element includes a sleeve and a sliding strip. The sleeve is disposed on the outer peripheral wall of the rotating shaft and distributed along the cross-sectional radius of the rotating shaft. The sliding strip is slidably installed at one end of the sleeve away from the rotating shaft. An abutment spring is disposed inside the sleeve. The abutment spring is connected to one end of the sliding strip. The end of the sliding strip away from the sleeve is connected to the scraper.

[0019] By adopting the above technical solution, the abutment spring pushes the scraper to slide along the radius of the rotating shaft section and fit against the inner circumferential wall of the filter cartridge. When the spiral blades rotate, the scraper can clean the inner circumferential wall of the filter cartridge, reducing the impact of material adhesion on the filtration effect.

[0020] Optionally, an opening is provided on the outer peripheral wall of the mounting cylinder and on the downward side, and a water inlet groove is provided on the lower side of the mounting cylinder below the opening. The water inlet groove is inclined, and the water pipe is connected to one side of the water inlet groove.

[0021] By adopting the above technical solution, the filtered liquid can flow into the water inlet tank through the opening, and then be smoothly transported to the recycling tank through the water pipe using the inclined structure of the water inlet tank, which facilitates the collection of the liquid.

[0022] Optionally, an installation frame is slidably installed at the water inlet channel, the installation frame is distributed along the length direction of the water inlet channel, and a filter screen is provided on the installation frame, the filter screen is distributed along the length direction of the installation frame.

[0023] By adopting the above technical solution, the mounting frame that slides at the water inlet tank and the filter screen on the mounting frame perform secondary filtration on the liquid flowing into the water inlet tank, further improving the purity of the recovered liquid.

[0024] Optionally, a plug rod is slidably installed on the water inlet channel, a limiting spring is sleeved on the plug rod, a limiting block is provided on one side of the mounting frame, a limiting hole is opened on the limiting block, and the plug rod is inserted and connected to the limiting block through the limiting hole.

[0025] By adopting the above technical solution, the insertion rod and the limiting block are connected through the limiting hole, and the insertion rod is fitted with a limiting spring, which facilitates the disassembly and installation of the frame and makes it easy to clean or replace the filter screen.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Filter the material once before centrifugation to reduce the moisture content, shorten the centrifugation time, and improve the efficiency of centrifugation. 2. During the material conveying process, the filter cartridge rotates synchronously with the rotating spiral blades, ensuring full contact between the material and the filter cartridge and improving the filtration effect; 3. The scraper, cleaning roller and scraper bar clean the mounting cylinder and filter cylinder to prevent material blockage and ensure the normal operation of the filtration device. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of this application.

[0028] Figure 2 This is a three-dimensional structural diagram of the mounting cylinder located at one end of the feeding pipe in this application.

[0029] Figure 3 This is a partial cross-sectional structural diagram of the interior of the mounting cylinder of this application.

[0030] Figure 4 This is a partial cross-sectional structural diagram of the inner side of the filter cartridge of this application.

[0031] Figure 5 This is an exploded structural diagram of the water inlet channel and mounting frame of this application.

[0032] Those skilled in the art will understand that the elements in the accompanying drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be enlarged relative to other elements to aid in understanding the embodiments of the invention.

[0033] Reference numerals: 1. Frame; 11. Recycling bin; 12. Water pipe; 2. Centrifuge; 3. Mounting cylinder; 31. Feeding pipe; 32. Rotating shaft; 321. Scraper; 33. Spiral blade; 34. Rotating ring; 341. Scraper rod; 35. Opening; 36. Water inlet trough; 361. Mounting frame; 362. Filter screen; 363. Insert rod; 364. Limiting spring; 365. Limiting block; 3651. Limiting hole; 37. Cleaning roller; 4. Filter cartridge; 5. Driving component; 51. Drive motor; 52. First gear; 53. Second gear; 54. Third gear; 55. Gear ring; 551. External gear ring; 552. Internal gear ring; 6. Connecting component; 61. Connecting gear ring; 62. Connecting gear; 7. Elastic component; 71. Sleeve; 72. Sliding bar; 73. Abutment spring. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] This application discloses a pre-filtration device for a centrifuge, referring to... Figure 1 and Figure 2 The centrifuge 2 is mounted on a frame 1. A feed pipe is vertically mounted on the top of the centrifuge 2. An inclined mounting cylinder 3 is mounted on the frame 1, with its lower side connected to the feed pipe of the centrifuge 2. A filter cartridge 4 for filtering materials is coaxially mounted inside the mounting cylinder 3. A feeding pipe 31 is located at the end of the mounting cylinder 3 facing away from the centrifuge 2, communicating with the interior of the filter cartridge 4. A rotating shaft 32 is coaxially mounted inside the mounting cylinder 3, with spiral blades 33 on the shaft 32 for propelling the material. A drive component 5 is mounted on the mounting cylinder 3 to drive the spiral blades 33. A recovery box 11 is mounted on the frame 1, communicating with the interior of the mounting cylinder 3 via a water pipe 12. After the material enters the filter cartridge 4 through the feeding pipe 31, the spiral blades 33 rotate, propelling the material. During transport, the material contacts the filter cartridge 4, achieving filtration. The filtered liquid is collected in the recovery box 11, reducing the moisture content of the material entering the centrifuge 2. Pre-filtering the material before centrifugation reduces its moisture content and shortens the centrifugation time.

[0036] Reference Figure 2 and Figure 3The filter cartridge 4 is typically made of metal mesh and is cylindrical in shape, coaxially distributed with the mounting cylinder 3. A rotating ring 34 is rotatably mounted on one end face of the mounting cylinder 3, and the rotating ring 34 is coaxially distributed with the mounting cylinder 3. The upper end of the filter cartridge 4 is connected to the rotating ring 34. The driving component 5 includes a drive motor 51, a first gear 52, a second gear 53, a third gear 54, and a gear ring 55. The drive motor 51 is located at the end of the mounting cylinder 3. The first gear 52 is coaxially fixed at the output shaft of the drive motor 51. The gear ring 55 is coaxially located on the side of the rotating ring 34 away from the filter cartridge 4. An outer gear ring 551 is provided on the outer circumferential wall of the gear ring 55. The first gear 52 meshes with one side of the outer gear ring 551 of the gear ring 55. The second gear 53 is coaxially disposed at one end of the rotating shaft 32 and located outside the mounting cylinder 3. The third gear 54 is rotatably mounted at one end of the mounting cylinder 3. One side of the third gear 54 meshes with one side of the second gear 53. An inner gear ring 552 is provided on the inner circumferential wall of the gear ring 55. The side of the third gear 54 away from the second gear 53 meshes with the inner gear ring 552 of the gear ring 55.

[0037] When the drive motor 51 drives the first gear 52 to rotate, the first gear 52 drives the gear ring 55 to rotate through the meshing outer gear ring 551. The gear ring 55 drives the rotating ring 34 to rotate. At the same time, the inner gear ring 552 of the gear ring 55 drives the meshing third gear 54 to rotate. The third gear 54 drives the second gear 53 to rotate, which in turn drives the rotating shaft 32 to rotate. This realizes that the spiral blade 33 and the filter cartridge 4 rotate synchronously in opposite directions, ensuring that the material is conveyed and filtered in the filter cartridge 4.

[0038] Reference Figure 2 and Figure 3 An opening 35 is provided on the outer peripheral wall of the mounting cylinder 3, facing downwards. The opening 35 is distributed along the length of the mounting cylinder 3. A water inlet trough 36 is provided below the opening 35, covering it. The water inlet trough 36 is inclined and distributed along the length of the mounting cylinder 3. The upward end of the water pipe 12 is connected to the downward side of the water inlet trough 36. The filtered liquid flows into the water inlet trough 36 through the opening 35, and is smoothly transported to the recovery tank 11 through the water pipe 12 by the inclined structure of the water inlet trough 36, facilitating the collection of the liquid.

[0039] Reference Figure 3 and Figure 4 A scraper 341 is provided on the rotating ring 34 and located inside the mounting cylinder 3. The scraper 341 is distributed along the length of the mounting cylinder 3, and one side of the scraper 341 is in contact with the inner peripheral wall of the mounting cylinder 3. There are two scraper 341s, which are distributed relative to each other about the axis of the mounting cylinder 3. When the rotating ring 34 rotates, it drives the scraper 341 to rotate, and the scraper 341 cleans the inner peripheral wall of the mounting cylinder 3, reducing the adhesion of some of the deposited material.

[0040] Reference Figure 3 and Figure 4A cleaning roller 37 is rotatably mounted inside the mounting cylinder 3 at the end opposite to the rotating ring 34. The cleaning roller 37 is distributed along the length of the mounting cylinder 3. Cleaning bristles are provided on the outer circumferential wall of the cleaning roller 37, with one end of the cleaning bristles in contact with the outer circumferential wall of the filter cartridge 4. The cleaning brush is connected to the scraper rod 341 via a connector 6. The connector 6 includes a connecting gear ring 61 and a connecting gear 62. The connecting gear ring 61 is rotatably mounted inside the mounting cylinder 3 at the end opposite to the rotating ring 34. One end of the scraper rod 341 is connected to the connecting gear ring 61. The connecting gear 62 is coaxially connected to the cleaning roller 37, and the connecting gear 62 meshes with the inner teeth of the connecting gear ring 61. The scraper rod 341 rotates with the rotating ring 34, and through the cooperation of the connecting gear ring 61 and the connecting gear 62, the cleaning roller 37 is driven to rotate synchronously. The cleaning bristles on the cleaning roller 37 clean the outer circumferential wall of the filter cartridge 4. The synchronous drive operation is convenient.

[0041] Reference Figure 3 and Figure 4 A scraper 321 is provided on the rotating shaft 32, distributed along the length of the filter cartridge 4. The scraper 321 is in contact with the inner peripheral wall of the filter cartridge 4. An elastic element 7 is provided on the rotating shaft 32, including a sleeve 71 and a sliding strip 72. The sleeve 71 is provided on the outer peripheral wall of the rotating shaft 32 and distributed along the radius of the cross section of the rotating shaft 32. The sliding strip 72 is slidably installed at the end of the sleeve 71 away from the rotating shaft 32. An abutment spring 73 is provided inside the sleeve 71 and is connected to one end of the sliding strip 72. The end of the sliding strip 72 away from the sleeve 71 is connected to the scraper 321. When the rotating shaft 32 rotates, the abutment spring 73 pushes the scraper 321 to slide along the radius of the cross section of the rotating shaft 32 and fit against the inner peripheral wall of the filter cartridge 4. When the spiral blade 33 rotates, the scraper 321 scrapes the material on the inner peripheral wall of the filter cartridge 4, reducing the material adhering to the inner peripheral wall of the filter cartridge 4 and affecting the filtration effect.

[0042] Reference Figure 3 and Figure 5 A mounting frame 361 is slidably installed at the water inlet trough 36, and the mounting frame 361 is distributed along the length of the water inlet trough 36. A filter screen 362 is installed on the mounting frame 361, and the filter screen 362 is distributed along the length of the mounting frame 361. The filter screen 362 is a metal filter screen, which performs secondary filtration on the liquid flowing into the water inlet trough 36, further improving the purity of the recovered liquid.

[0043] Reference Figure 5A vertically sliding insert rod 363 is mounted on the outer side of the water inlet trough 36, and a limiting spring 364 is fitted onto the insert rod 363. A horizontal limiting block 365 is provided on one side of the mounting frame 361, and a vertical limiting hole 3651 is opened on the limiting block 365. The insert rod 363 is inserted into the limiting block 365 through the limiting hole 3651. The insertion rod 363 and the limiting block 365 are inserted into each other through the limiting hole 3651, and the limiting spring 364 is fitted onto the insert rod 363, which facilitates the disassembly and installation of the mounting frame 361 and makes it easy to clean or replace the filter screen 362.

[0044] The implementation principle of the pre-filtration device of a centrifuge in this embodiment is as follows: the material enters the filter cylinder 4 from the feeding pipe 31, the drive motor 51 starts to work, and drives the first gear 52 to rotate. The first gear 52 drives the gear ring 55 to rotate through the meshing outer gear ring 551. The gear ring 55 drives the rotating ring 34 to rotate. The rotating ring 34 drives the filter cylinder 4 to rotate. At the same time, the inner gear ring 552 of the gear ring 55 drives the meshing third gear 54 to rotate. The third gear 54 drives the second gear 53 to rotate, which in turn drives the rotating shaft 32 to rotate. This realizes that the spiral blades 33 and the filter cylinder 4 rotate synchronously in opposite directions. The spiral blades 33 push the material to be transported in the filter cylinder 4. During the transportation process, the material comes into contact with the rotating filter cylinder 4 to achieve water filtration.

[0045] The filtered liquid flows into the water inlet tank 36 through the opening 35 and is then transported to the recovery tank 11 for collection via the water pipe 12. A filter screen 362 is installed on the mounting frame 361 at the water inlet tank 36 to perform secondary filtration on the liquid flowing into the water inlet tank 36, further improving the purity of the recovered liquid.

[0046] During the rotation of the rotating ring 34, the scraper 341 on the rotating ring 34 rotates accordingly. The scraper 341 cleans the inner peripheral wall of the mounting cylinder 3. At the same time, the scraper 341 drives the cleaning roller 37 to rotate synchronously through the cooperation of the connecting gear ring 61 and the connecting gear 62. The cleaning bristles on the outer peripheral wall of the cleaning roller 37 clean the outer peripheral wall of the filter cylinder 4.

[0047] When the rotating shaft 32 rotates, the abutting spring 73 pushes the scraper 321 to slide and adhere to the inner peripheral wall of the filter cylinder 4, scraping the material on the inner peripheral wall of the filter cylinder 4, reducing the material adhering to the inner peripheral wall of the filter cylinder 4 and affecting the filtration effect.

[0048] The limiting spring 364 pushes the insertion rod 363 to connect with the limiting block 365 through the limiting hole 3651, which facilitates the disassembly and installation of the mounting frame 361 and makes it easy to clean or replace the filter screen 362.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pre-filtration device for a centrifuge, comprising a frame (1) and a centrifuge (2) mounted on the frame (1), characterized in that: The frame (1) is provided with an installation cylinder (3), one end of which is connected to the feed pipe of the centrifuge (2). A filter cylinder (4) for filtering water from the material is rotatably installed inside the installation cylinder (3). A feeding pipe (31) is provided at the end of the installation cylinder (3) away from the feed pipe. The feeding pipe (31) is connected to the inside of the filter cylinder (4). A spiral blade (33) for pushing the material is rotatably installed inside the filter cylinder (4) on the installation cylinder (3). A drive component (5) for driving the spiral blade (33) to rotate is provided on the installation cylinder (3). A recycling box (11) is provided on the frame (1). The recycling box (11) is connected to the inside of the installation cylinder (3) through a water pipe (12).

2. The pre-filtration device for a centrifuge according to claim 1, characterized in that: A rotating ring (34) is rotatably mounted on the mounting cylinder (3). The rotating ring (34) is coaxially distributed with the mounting cylinder (3). The end of the filter cylinder (4) is connected to the rotating ring (34). The rotating ring (34) is rotatably connected to the spiral blade (33). When the driving component (5) drives the spiral blade (33) to rotate, the rotating ring (34) and the spiral blade (33) rotate synchronously.

3. The pre-filtration device for a centrifuge according to claim 2, characterized in that: The driving component (5) includes a drive motor (51), a first gear (52), a second gear (53), a third gear (54), and a gear ring (55). The gear ring (55) is coaxially disposed on one side of the rotating ring (34). The drive motor (51) is disposed at the end of the mounting cylinder (3). The first gear (52) is coaxially disposed at the output shaft of the drive motor (51). An outer gear ring (551) is disposed on the outer circumferential wall of the gear ring (55). The first gear (52) meshes with one side of the outer gear ring (551) of the gear ring (55). A rotating shaft (32) is coaxially rotatably mounted in the mounting cylinder (3). The spiral blade (33) is disposed on the rotating shaft (32). The second gear (53) is coaxially disposed at one end of the rotating shaft (32). The third gear (54) is rotatably mounted at one end of the mounting cylinder (3). One side of the third gear (54) meshes with one side of the second gear (53). An internal gear ring (552) is disposed on the inner circumferential wall of the gear ring (55). The side of the third gear (54) away from the second gear (53) meshes with the internal gear ring (552) of the gear ring (55).

4. The pre-filtration device for a centrifuge according to claim 2, characterized in that: A scraper (341) is provided on the rotating ring (34). The scraper (341) is distributed along the length of the mounting cylinder (3). One side of the scraper (341) is in contact with the inner circumferential wall of the mounting cylinder (3). A cleaning roller (37) is rotatably installed inside the mounting cylinder (3). A cleaning brush is provided on the outer circumferential wall of the cleaning roller (37). The cleaning brush is in contact with the outer circumferential wall of the filter cylinder (4). The cleaning brush is connected to the scraper (341) through a connector (6).

5. A pre-filtration device for a centrifuge according to claim 4, characterized in that: The connector (6) includes a connecting gear ring (61) and a connecting gear (62). The connecting gear ring (61) is rotatably installed inside the mounting cylinder (3). The scraper (341) is connected to the connecting gear ring (61). The connecting gear (62) is coaxially connected to the cleaning roller (37). The connecting gear (62) meshes with the connecting gear ring (61).

6. A pre-filtration device for a centrifuge according to claim 3, characterized in that: The rotating shaft (32) is provided with a scraper (321), the scraper (321) is distributed along the length direction of the filter cylinder (4), the scraper (321) is attached to the inner peripheral wall of the filter cylinder (4), the scraper (321) slides along the radius direction of the cross section of the rotating shaft (32), and the rotating shaft (32) is provided with an elastic element (7) for pushing the scraper (321) to slide.

7. A pre-filtration device for a centrifuge according to claim 6, characterized in that: The elastic element (7) includes a sleeve (71) and a sliding strip (72). The sleeve (71) is disposed on the outer peripheral wall of the rotating shaft (32) and distributed along the cross-sectional radius of the rotating shaft (32). The sliding strip (72) is slidably installed on one end of the sleeve (71) away from the rotating shaft (32). A retaining spring (73) is disposed inside the sleeve (71). The retaining spring (73) is connected to one end of the sliding strip (72). The end of the sliding strip (72) away from the sleeve (71) is connected to the scraper (321).

8. A pre-filtration device for a centrifuge according to claim 1, characterized in that: An opening (35) is provided on the outer peripheral wall of the mounting cylinder (3) and on the downward side. A water inlet trough (36) is provided on the lower side of the mounting cylinder (3) and the water inlet trough (36) is inclined. The water pipe (12) is connected to one side of the water inlet trough (36).

9. A pre-filtration device for a centrifuge according to claim 8, characterized in that: An installation frame (361) is slidably installed at the water inlet channel (36). The installation frame (361) is distributed along the length direction of the water inlet channel (36). A filter screen (362) is provided on the installation frame (361). The filter screen (362) is distributed along the length direction of the installation frame (361).

10. A pre-filtration device for a centrifuge according to claim 9, characterized in that: A plug rod (363) is slidably installed on the water inlet channel (36). A limiting spring (364) is sleeved on the plug rod (363). A limiting block (365) is provided on one side of the mounting frame (361). A limiting hole (3651) is opened on the limiting block (365). The plug rod (363) is plugged into the limiting block (365) through the limiting hole (3651).

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