Cylindrical precleaner

Abstract

The utility model discloses a cylinder precleaner which comprises a shell and a screen drum rotationally arranged in the shell, a supporting assembly is further arranged in the shell, a beating assembly is arranged above the screen drum, and a cleaning assembly is arranged on one side of the screen drum. The beating assembly comprises a transmission shaft and a supporting shaft, a plurality of protrusions are arranged on the surface of the transmission shaft, a plurality of swing rods are arranged on the supporting shaft, the middles of the swing rods are hinged to the supporting shaft, and beating blocks are installed at the ends, away from the transmission shaft, of the swing rods; a gear is arranged at one end of the transmission shaft; a gear ring is arranged on the outer wall of the screen drum; a feeding hopper is arranged at the top of the shell, the end, away from the feeding hopper, of the screen drum inclines downwards, a conveying assembly is arranged at the bottom of an inner cavity of the feeding hopper, a feeding pipe is arranged on the left side of the bottom of the conveying assembly in a communicating mode, and one end of the feeding pipe extends into the screen drum. According to the utility model, after the striking block strikes the screen drum, the brush is used for cleaning, so that dust blocking the screen holes can be better cleaned, manual cleaning is not needed, and convenience is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of grain impurity removal, in particular to a cylindrical primary cleaning screen. Background Art

[0002] Before grain enters the raw material bin of a processing workshop, a cylindrical primary cleaning screen is typically used for pre-processing. This screen is primarily used to remove larger impurities such as straw, fiber bands, bricks, and mud. Like other pre-cleaning equipment, the cylindrical primary cleaning screen aims to improve grain quality, prevent clogging and damage to subsequent machinery, and prepare the grain for the next process step.

[0003] A cylindrical primary cleaning screen usually includes a housing, in which a screen drum is rotatably connected. The sidewall of the screen drum is provided with a plurality of sieve holes for screening grain particles. The screen drum is driven to rotate by a rotary motor fixed at one end of the housing. One end of the screen drum is connected to a feed hopper, which passes through the housing and extends above the housing at the end of the feed hopper away from the screen drum. The end of the screen drum away from the feed hopper is rotatably connected to a waste pipe, which passes through the housing and extends downward. The bottom end of the housing is connected to a discharge pipe. When in use, grain is poured into the screen drum from the feed hopper, and then the sieve drum is driven to rotate by the rotary motor. As the sieve drum rotates, the grain will be continuously thrown through the sieve holes into the space between the sieve drum and the housing, and then discharged through the discharge pipe. Impurities remain in the sieve drum and are discharged through the discharge pipe as the sieve drum rotates, thus achieving separation of grain and impurities.

[0004] In the actual operation of the cylindrical primary cleaning screen in the existing technology, a lot of dust accumulates in the sieve holes of the sieve drum due to the large amount of dust in the raw grain. Over time, the sieve holes are easily clogged, resulting in reduced screening efficiency. In addition, there is no cleaning device on the sieve drum, and manual cleaning is required after the machine is shut down. This increases the workload of the staff on the one hand, and on the other hand, the cleaning efficiency is low, which affects the working efficiency of the sieve drum. Summary of the Invention

[0005] In order to solve the problems pointed out in the background technology, the utility model proposes a cylindrical primary cleaning screen. By arranging a knocking component and a cleaning component, when the knocking block knocks the screen cylinder, it is cleaned by a brush. This can better clean the dust clogging the screen holes and does not require manual cleaning, which is more convenient.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A cylindrical primary cleaning screen comprises a housing and a screen drum rotatably arranged in the housing, a supporting assembly is further arranged in the housing, a knocking assembly is arranged above the screen drum, and a cleaning assembly is arranged on one side of the screen drum;

[0008] The knocking assembly includes a transmission shaft and a support shaft arranged on one side of the transmission shaft. A number of protrusions are spaced on the surface of the transmission shaft. A number of swing rods are spaced on the support shaft. The middle of the swing rod is hinged on the support shaft. A striking block is installed at one end of the swing rod away from the transmission shaft. The end face of the swing rod near the transmission shaft is in movable pressing connection with the protrusion. A gear is arranged at one end of the transmission shaft. A toothed ring meshing with the gear is arranged on the outer wall of the sieve cylinder.

[0009] A feed hopper extending to its left is arranged at the top of the housing. One end of the sieve cylinder away from the feed hopper is inclined downward. A conveying assembly is arranged at the bottom of the inner cavity of the feed hopper. A feeding pipe is communicated with the left side of the bottom of the conveying assembly. One end of the feeding pipe away from the feed hopper extends into the sieve cylinder.

[0010] Preferably, the support assembly includes a support plate and rollers. A through hole is formed in the center of the support plate. The support plate is fixedly connected with the housing. The right end of the sieve cylinder passes through the through hole in the center of the support plate. Two groups of supports are symmetrically arranged on the hole wall of the through hole of the support plate. The number of supports in each group is two. The rollers are rotatably arranged between the two supports in the same group. The rollers are in contact with the sieve cylinder. The part of the sieve cylinder in contact with the rollers is solid.

[0011] Preferably, the cleaning assembly includes a mounting plate. The mounting plate is fixed on the inner wall of the housing. A brush is installed at one end of the mounting plate close to the sieve cylinder.

[0012] Preferably, a number of through holes are arranged on the outer side of the sieve cylinder on the right side of the support plate. The multiple through holes are distributed in a circular array along the outer peripheral surface of the sieve cylinder.

[0013] Preferably, a partition plate is arranged at the high end of the sieve cylinder. A central hole is formed in the center of the partition plate. The feeding pipe is an L-shaped pipe. The horizontal part of the feeding pipe penetrates through the central hole of the partition plate.

[0014] Preferably, the low end of the sieve cylinder is a closed end. The through holes are located between the support plate and the closed end of the sieve cylinder. A number of sieve holes are also arranged on the outer side of the sieve cylinder on the left side of the support plate. The multiple sieve holes are arrayed on the sieve cylinder. The sieve holes are located between the support plate and the left side wall of the housing.

[0015] Preferably, the conveying assembly includes a feeding bin, a rotating shaft and a first motor. The rotating shaft is horizontally arranged inside the feeding bin. The right end of the rotating shaft is rotatably arranged on the right side wall of the feeding bin. A spiral blade is arranged on the rotating shaft. The first motor is located on the left side of the feed hopper. The left end of the rotating shaft sequentially penetrates through the feeding bin and the feed hopper and is connected with the output shaft of the first motor through a coupling. A conveying inlet is arranged on the right side of the top of the feeding bin. The vertical part of the feeding pipe penetrates through the outer walls of the feed hopper and the feeding bin and is communicated with the feeding bin.

[0016] Preferably, a discharge pipe and a drainage pipe are provided at the bottom of the shell, the upper ends of the discharge pipe and the drainage pipe both pass through the interior of the shell and are connected to the shell, the discharge pipe is located on the left side of the support plate, and the drainage pipe is located on the right side of the support plate.

[0017] Preferably, it also includes a driving assembly for driving the screen drum to rotate, the driving assembly is located on the right side of the shell, and support legs are provided at the four corners of the bottom of the shell. The driving assembly includes motor 2, and motor 2 is installed on the support legs through a bracket. A driving sprocket is provided on the output shaft of motor 2, and a driving shaft is provided on the outer side of the closed end of the screen drum. The driving shaft is concentrically arranged with the screen drum, and a passive sprocket is provided on the driving shaft, and a chain is provided between the active sprocket and the passive sprocket.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model is provided with a knocking assembly and a cleaning assembly. When the screen drum rotates, the ring gear will drive the gear to rotate. As the gear rotates, the transmission shaft will drive the protrusion to rotate. When the protrusion rotates to contact the rocker arm, it will squeeze one end of the rocker arm, and the striking block installed at the other end of the rocker arm will tilt. When the protrusion continues to rotate until it is disengaged from the rocker arm, the striking block falls and waits for the arrival of the next protrusion. This is repeated, which will cause the striking block to continuously knock on the screen drum. The striking of the striking block will cause a certain vibration at the striking location, which helps to shake off the dust blocked in the screen hole. At the same time, as the screen drum rotates, the striking block knocks on the screen drum and then is cleaned by a brush, which can better clean the dust blocking the screen hole.

[0020] 2. The utility model uses a conveying component to convey the grain in the feed hopper to the screen drum through the feeding pipe. Specifically, after the grain to be screened is poured into the feed hopper, the grain enters the feeding bin from the conveying inlet. Once the motor is started, it drives the spiral blades on the rotating shaft to rotate. The rotating spiral blades can push the grain to the left of the feeding bin in equal amounts, so that the grain is conveyed in equal amounts to the feeding pipe and then enters the screen drum, preventing the grain inside the feed hopper from being blocked, effectively improving the operating efficiency of the cylindrical primary cleaning screen, and by providing a support component, the rotating roller can support the screen drum, thereby improving the stability of the screen drum during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front perspective view of a cylindrical primary cleaning screen of the present invention.

[0022] Figure 2 It is a front view of a cylindrical primary cleaning screen of the present utility model.

[0023] Figure 3 This utility model is a cylindrical primary cleaning screen Figure 2 Cross-sectional view at AA in the middle.

[0024] Figure 4 It is a cross-sectional view of a screen drum in a cylindrical primary cleaning screen of the present invention.

[0025] Figure 5 It is a schematic diagram of a knocking component in a cylindrical primary cleaning screen of the present invention.

[0026] Figure 6 It is a schematic diagram of a cleaning component in a cylindrical primary cleaning screen of the present invention.

[0027] Figure 7 It is a schematic diagram of a supporting assembly in a cylindrical primary cleaning screen of the present invention.

[0028] Figure 8 This is a connection diagram of a screen drum, a beating assembly, a cleaning assembly and a supporting assembly in a cylindrical primary cleaning screen of the utility model.

[0029] Figure 9 It is a three-dimensional back view of a cylindrical primary cleaning screen of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0031] like Figures 1 to 9 As shown, a cylindrical primary cleaning screen comprises a shell 1 and a screen drum 2 rotatably arranged in the shell 1, a supporting assembly is further provided in the shell 1, a knocking assembly is provided above the screen drum 2, and a cleaning assembly is provided on one side of the screen drum 2, and the cleaning assembly comprises a mounting plate 16, the mounting plate 16 is fixed to the inner wall of the shell 1, and a brush 17 is installed at one end of the mounting plate 16 close to the screen drum 2, wherein the length of the brush 17 is greater than the distance between the end face of the mounting plate 16 and the outer wall of the drum 2, so that the bristles of the brush 17 abut against the outer wall of the screen drum 2, and as the screen drum 2 rotates, the bristles of the brush 17 are realized Purpose of cleaning the sieve hole 21; Specifically, the knocking assembly includes a transmission shaft 3 and a support shaft 4 arranged on one side of the transmission shaft 3, three protrusions 5 are arranged at intervals on the surface of the transmission shaft 3, and the three protrusions 5 are distributed in a ring array, and a number of rocker arms 6 are arranged at intervals on the support shaft 4, the middle part of the rocker arm 6 is hinged on the support shaft 4, and a striking block 7 is installed on the end of the rocker arm 6 away from the transmission shaft 3, and the end face of the rocker arm 6 close to the transmission shaft 3 is movably pressed against the protrusion 5; a gear 8 is provided at one end of the transmission shaft 3, and a gear ring 9 meshing with the gear 8 is provided on the outer wall of the sieve drum 2. When the sieve drum 2 rotates, the gear ring 9 will drive the gear 8 to rotate, and the diameter of the gear ring 9 is larger than the diameter of the gear 8, so when the gear ring 9 drives the gear 8 to rotate, it plays a role in increasing the speed, and as the gear 8 rotates, it will drive the transmission shaft 3 to rotate, so that the rotation of the transmission shaft 3 will drive the protrusion 5 to rotate.

[0032] Further, please refer to again Figure 3 : The transmission shaft 3 rotates counterclockwise. When the protrusion 5 rotates to contact the swing rod 6, it will squeeze one end of the swing rod 6, and the striker 7 installed at the other end of the swing rod 6 will tilt up. When the protrusion 5 continues to rotate and disengages from the swing rod 6, the striker 7 will fall, waiting for the arrival of the next protrusion 5. Repeating this way will cause the striker 7 to continuously strike the sieve cylinder 2. The striking of the striker 7 will generate a certain vibration at the striking point, which helps to shake off the dust clogged in the sieve holes 21. At the same time, the sieve cylinder 2 rotates clockwise, and the striking assembly is in front of the cleaning assembly. In this way, after the striker 7 strikes the sieve cylinder 2, it will be cleaned by the brush 17, which can better clean the dust clogging the sieve holes 21.

[0033] Please refer to again Figure 5 , the swing rods 6 are arranged in a row on the support shaft 4. Among them, the striker 7 is rotatably arranged on the swing rod 6. It is worth mentioning that the striker 7 is made of rubber material, and the inside of the striker 7 is a hollow structure, and stone sand can be injected into the striker 7 as a counterweight to enhance the weight of the striker 7.

[0034] The applicant wishes to state that since the existing cylindrical primary cleaner uses a chute feeding method, when screening grains with poor fluidity, it is easy to cause the grains to accumulate in the chute, resulting in chute blockage. Therefore, in view of the situation that the feeding chute is prone to blockage during the working process, in the present utility model, a feed hopper 10 extending to its left is provided at the top of the housing 1. One end of the sieve cylinder 2 away from the feed hopper 10 is inclined downward. A conveying assembly is provided at the bottom of the inner cavity of the feed hopper 10. The left side of the bottom of the conveying assembly is connected and provided with a feed pipe 11, and one end of the feed pipe 11 away from the feed hopper 10 extends into the sieve cylinder 2.

[0035] Specifically, please refer to again Figure 2, the conveying assembly includes a feeding bin 22, a rotating shaft 23 and a first motor 24. The rotating shaft 23 is horizontally arranged inside the feeding bin 22. The right end of the rotating shaft 23 is rotatably arranged on the right side wall of the feeding bin 22. A spiral blade 25 is arranged on the rotating shaft 23. The first motor 24 is located on the left side of the feeding hopper 10. The left end of the rotating shaft 23 sequentially penetrates through the feeding bin 22 and the feeding hopper 10 and is connected to the output shaft of the first motor 24 through a coupling. A conveying inlet 26 is opened on the right side of the top of the feeding bin 22; the vertical part of the feeding pipe 11 penetrates through the outer walls of the feeding hopper 10 and the feeding bin 22 and is communicated with the feeding bin 22. The grains in the feeding hopper 10 are conveyed into the screening cylinder 2 through the feeding pipe 11 by the conveying assembly. During use, the grains to be screened are poured into the feeding hopper 10. The grains enter the feeding bin 2 from the conveying inlet 26. After the first motor 24 is started, the spiral blade 25 on the rotating shaft 23 rotates. The rotating spiral blade 25 can push the grains to the left of the feeding bin 22 in equal amounts, so that the grains are conveyed into the feeding pipe 11 in equal amounts and then enter the screening cylinder 2, preventing the grains inside the feeding hopper 10 from being blocked and effectively improving the operating efficiency of the cylindrical primary cleaner.

[0036] Please refer to again Figure 7 , the supporting assembly includes a support plate 12 and rollers 13. A through hole 14 is opened in the center of the support plate 12. The support plate 12 is fixedly connected to the housing 1. The right end of the screening cylinder 2 passes through the through hole 14 in the center of the support plate 12. Two groups of supports 15 are symmetrically arranged on the hole wall of the through hole 14 of the support plate 12. The number of supports 15 in each group is two. The rollers 13 are rotatably arranged between the two supports 15 in the same group. The rollers 13 are in contact with the screening cylinder 2. The part of the screening cylinder 2 in contact with the rollers 13 is solid. By setting the supporting assembly, the rotating screening cylinder 2 can drive the rollers 13 to rotate. The rotating rollers 13 can support the screening cylinder 2 and improve the stability of the screening cylinder 2 during rotation.

[0037] Please refer to again Figure 4 , a plurality of through holes 18 are opened on the outer side of the screening cylinder 2 and are located on the right side of the support plate 12; at the same time, a partition 19 is arranged at the high end of the screening cylinder 2. A central hole 20 is opened in the center of the partition 19. The feeding pipe 11 is an L-shaped pipe. The horizontal part of the feeding pipe 11 penetrates through the central hole 20 of the partition 19.

[0038] Further, the low end of the screening cylinder 2 is a closed end. The through holes 18 are located between the support plate 12 and the closed end of the screening cylinder 2. A plurality of screening holes 21 are also opened on the outer side of the screening cylinder 2 and are located on the left side of the support plate 12. The plurality of screening holes 21 are arranged in an array on the screening cylinder 2. The screening holes 21 are located between the support plate 12 and the left side wall of the housing 1.

[0039] In this embodiment, a discharge pipe 27 and a discharge pipe 28 are provided at the bottom of the shell 1. The upper ends of the discharge pipe 27 and the discharge pipe 28 pass through the interior of the shell 1 and are connected to the shell 1. The discharge pipe 27 is located on the left side of the support plate 12, and the discharge pipe 28 is located on the right side of the support plate 12.

[0040] Through the above-mentioned structure, during screening, the grain is continuously thrown from the sieve holes 21 into the space between the sieve drum 2 and the shell 1, and then discharged from the discharge pipe 27; while the impurities remain in the sieve drum 2, and as the sieve drum 2 rotates, the impurities are discharged from the discharge pipe 28, thereby realizing the primary screening of the grain.

[0041] In this embodiment, a drive assembly for driving the screen drum 2 to rotate is also included. The drive assembly is located on the right side of the housing 1. Support legs 29 are provided at the four corners of the bottom of the housing 1. The drive assembly includes a second motor 30. The second motor 30 is mounted on the support legs 29 through a bracket. A driving sprocket 31 is provided on the output shaft of the second motor 30. A drive shaft 32 is provided on the outer side of the closed end of the screen drum 2. The drive shaft 32 is concentrically arranged with the screen drum 2. A driven sprocket 33 is provided on the drive shaft 32. A chain 34 is provided between the driving sprocket 31 and the driven sprocket 33. The chain 34 engages with the driving sprocket 31 and the driven sprocket 33 to transmit the power of the second motor 30 to the driven sprocket 33, thereby driving the screen drum 2 to rotate.

[0042] How to use this product:

[0043] The grain to be screened is poured into the feed hopper 10, and the grain enters the feeding bin 22 from the conveying inlet 26. The motor 24 drives the spiral blade 25 to rotate. The rotating spiral blade 25 can push the grain to the left of the feeding bin 22 in equal amounts, so that the grain is transported in equal amounts to the feeding pipe 11 and the screen drum 2.

[0044] Start the second motor 30, which engages with the driving sprocket 31 through the chain 34, and then transmits power to the driven sprocket 33, thereby driving the screen drum 2 to rotate. The grain flowing into the screen drum 2 will be screened. During screening, the grain is continuously thrown from the screen holes 21 into the space between the screen drum 2 and the shell 1, and then discharged from the discharge pipe 27; while the impurities remain in the screen drum 2. As the screen drum 2 rotates, the impurities are discharged from the discharge pipe 28, thereby realizing the primary screening of the grain.

[0045] During the initial screening of grain, when the screen drum 2 rotates, the ring gear 9 will drive the gear 8 to rotate, and as the gear 8 rotates, the transmission shaft 3 will drive the protrusion 5 to rotate. When the protrusion 5 rotates to contact the rocker arm 6, it will squeeze one end of the rocker arm 6, and the striking block 7 installed at the other end of the rocker arm 6 will tilt. When the protrusion 5 continues to rotate until it is disengaged from the rocker arm 6, the striking block 7 falls and waits for the arrival of the next protrusion 5. This is repeated, which will cause the striking block 7 to continuously hit the screen drum 2. The striking of the striking block 7 will cause a certain vibration at the striking point, which will help to shake off the dust blocked in the screen hole 21. At the same time, as the screen drum 2 rotates, the striking block 7 hits the screen drum 2 and then is cleaned by the brush 17, which can better clean the dust blocking the screen hole 21.

[0046] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A cylindrical primary cleaner, comprising a housing (1) and a sieve drum (2) rotatably arranged within the housing (1), characterized in that, A support assembly is also provided inside the housing (1), a knocking assembly is provided above the sieve cylinder (2), and a cleaning assembly is provided on one side of the sieve cylinder (2). The knocking assembly includes a transmission shaft (3) and a support shaft (4) provided on one side of the transmission shaft (3). A number of protrusions (5) are spacedly arranged on the surface of the transmission shaft (3). A number of swing rods (6) are spacedly arranged on the support shaft (4). The middle of the swing rod (6) is hinged to the support shaft (4). A striking block (7) is installed at one end of the swing rod (6) away from the transmission shaft (3). The end face of the swing rod (6) near the transmission shaft (3) is movably pressed against the protrusion (5). One end of the transmission shaft (3) is provided with a gear (8), and a gear ring (9) meshing with the gear (8) is provided on the outer wall of the sieve cylinder (2). A feed hopper (10) extending to its left is provided at the top of the housing (1). One end of the sieve cylinder (2) away from the feed hopper (10) is inclined downward. A conveying assembly is provided at the bottom of the inner cavity of the feed hopper (10). A feeding pipe (11) is communicated and provided at the left side of the bottom of the conveying assembly. One end of the feeding pipe (11) away from the feed hopper (10) extends into the sieve cylinder (2).

2. The cylinder pre-cleaning sieve according to claim 1, wherein The support assembly includes a support plate (12) and rollers (13). A through hole (14) is provided at the center of the support plate (12). The support plate (12) is fixedly connected to the housing (1). The right end of the sieve cylinder (2) passes through the through hole (14) at the center of the support plate (12). Two groups of supports (15) are symmetrically provided on the hole wall of the through hole (14) of the support plate (12). The number of supports (15) in each group is two. The rollers (13) are rotatably arranged between the two supports (15) in the same group. The rollers (13) are abutted against the sieve cylinder (2), and the part of the sieve cylinder (2) abutted against the rollers (13) is provided in a solid state.

3. The cylinder pre-cleaning sieve according to claim 1, characterized in that, The cleaning assembly includes a mounting plate (16). The mounting plate (16) is fixed on the inner wall of the housing (1). A brush (17) is installed at one end of the mounting plate (16) close to the sieve cylinder (2).

4. A cylindrical primary cleaner according to claim 2, characterized in that, A number of through holes (18) are provided on the outer side of the sieve cylinder (2) on the right side of the support plate (12). The multiple through holes (18) are circularly arrayed along the outer peripheral surface of the sieve cylinder (2).

5. A cylindrical initial cleaning sieve according to claim 1, characterized in that, A partition plate (19) is provided at the high end of the sieve cylinder (2). A central hole (20) is provided at the center of the partition plate (19). The feeding pipe (11) is an L-shaped pipe, and the horizontal part of the feeding pipe (11) penetrates through the central hole (20) of the partition plate (19).

6. The cylinder pre-cleaning sieve according to claim 4, wherein, The low end of the sieve cylinder (2) is a closed end. The through holes (18) are located between the support plate (12) and the closed end of the sieve cylinder (2). A number of sieve holes (21) are also provided on the outer side of the sieve cylinder (2) on the left side of the support plate (12). The number of sieve holes (21) is arrayed on the sieve cylinder (2). The sieve holes (21) are located between the support plate (12) and the left side wall of the housing (1).

7. A cylindrical primary cleaner according to claim 5, characterized in that, The conveying assembly includes a feeding bin (22), a rotating shaft (23) and a first motor (24). The rotating shaft (23) is horizontally arranged inside the feeding bin (22). The right end of the rotating shaft (23) is rotatably arranged on the right side wall of the feeding bin (22). A spiral blade (25) is arranged on the rotating shaft (23). The first motor (24) is located on the left side of the feed hopper (10). The left end of the rotating shaft (23) sequentially penetrates through the feeding bin (22) and the feed hopper (10) and is connected to the output shaft of the first motor (24) through a coupling. A conveying inlet (26) is opened on the right side of the top of the feeding bin (22). The vertical part of the feeding pipe (11) penetrates through the outer walls of the feed hopper (10) and the feeding bin (22) and is communicated with the feeding bin (22).

8. The cylinder pre-cleaning sieve according to claim 2, characterized in that, An outlet pipe (27) and a waste discharging pipe (28) are opened at the bottom of the housing (1). The upper ends of the outlet pipe (27) and the waste discharging pipe (28) both penetrate into the housing (1) and are communicated with the housing (1). The outlet pipe (27) is located on the left side of the support plate (12), and the waste discharging pipe (28) is located on the right side of the support plate (12).

9. A cylindrical primary cleaner according to claim 6, characterized in that, It further includes a driving assembly for driving the sieve cylinder (2) to rotate. The driving assembly is located on the right side of the housing (1). Support legs (29) are arranged at the four corners of the bottom of the housing (1). The driving assembly includes a second motor (30). The second motor (30) is installed on the support legs (29) through a bracket. A driving sprocket (31) is arranged on the output shaft of the second motor (30). A driving shaft (32) is arranged outside the closed end of the sieve cylinder (2). The driving shaft (32) is concentric with the sieve cylinder (2). A driven sprocket (33) is arranged on the driving shaft (32). A chain (34) is arranged between the driving sprocket (31) and the driven sprocket (33).

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