Self-cleaning drum screen for compound fertilizer production and screening system

Abstract

The utility model discloses a self-cleaning drum screen for compound fertilizer production and a screening system, and relates to the technical field of compound fertilizer finished product screening devices. The screen drum is rotationally arranged in the shell and obliquely arranged in the horizontal direction, a raw material feeding port is formed in one end of the screen drum, a tailing discharging port is formed in the other end of the screen drum, the screen drum is divided into a first screening section and a second screening section in the axis direction, and the first screening section is located on the side close to the raw material feeding port; the aperture of the sieve pores of the first sieving section is smaller than that of the sieve pores of the second sieving section; the driving mechanism is arranged on the shell and used for driving the screen drum to rotate; and the cleaning mechanism comprises an adjusting seat and a brush roller, the adjusting seat is movably arranged on the shell, the brush roller is rotationally assembled on the adjusting seat, and the adjusting seat can adjust the contact degree of the brush roller and the screen drum so that the brush roller can be driven by the screen drum to rotate. As the screen drum is matched with the cleaning mechanism, the problem that the screen of the screening device needs to be replaced frequently can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of compound fertilizer finished product screening devices, and in particular to a self-cleaning drum screen and a screening system for compound fertilizer production. Background Art

[0002] Finished product screening is an important link in the production of compound fertilizers. Its main purpose is to separate qualified product particles from non-compliant return materials (oversized or undersized particles, impurities, etc.) to ensure that the finished product is uniform and meets standard specifications. Currently, vibrating screens are mostly used as screening devices in the finished product screening process.

[0003] However, since some raw material components in compound fertilizers, such as potassium humate, are easy to absorb moisture, easy to form powder, and have high adhesion, they can easily cause the sieve holes to become clogged, which in turn will increase the proportion of returned materials. Therefore, the sieve holes need to be cleaned frequently. However, due to the limitations of the vibrating screen structure, the sieve holes are mostly cleaned by beating on them, which can easily cause damage to the screen and require frequent replacement of the screen. Utility Model Content

[0004] In order to improve the problem that the screening device needs to frequently replace the screen, the present application provides a self-cleaning drum screen and a screening system for compound fertilizer production.

[0005] According to the first aspect, an embodiment provides a self-cleaning drum screen for compound fertilizer production, comprising:

[0006] case;

[0007] A screen drum, wherein the screen drum is rotatably disposed in the housing and is tilted in the horizontal direction, wherein one end of the screen drum has a raw material feed port and the other end has a tailings discharge port, and the screen drum is divided into a first screening section and a second screening section along the axial direction, wherein the first screening section is located on a side close to the raw material feed port, and the screen hole diameter of the first screening section is smaller than the screen hole diameter of the second screening section;

[0008] A driving mechanism, the driving mechanism is arranged on the housing and is used to drive the screen drum to rotate;

[0009] The cleaning mechanism includes an adjustment seat and a brush roller, wherein the adjustment seat is movably arranged on the shell, the brush roller is rotatably assembled on the adjustment seat, and the brush roller is arranged on one side of the screen cylinder in a direction parallel to the screen cylinder, and the adjustment seat can adjust the contact degree between the brush roller and the screen cylinder so that the brush roller can rotate under the drive of the screen cylinder to clean the screen cylinder.

[0010] In one embodiment, the adjustment seat comprises:

[0011] A seat body, wherein the seat body is slidably disposed on the housing along the radial direction of the screen drum, and the brush roller is rotatably disposed on the seat body;

[0012] An adjusting component is arranged on the shell, and the adjusting component is linked with the seat body to drive the seat body to slide so that the brush roller abuts against the screen cylinder.

[0013] In one embodiment, the adjusting component comprises:

[0014] A driving member, the driving member is used to output a linear motion along the sliding direction of the seat body;

[0015] An elastic member is arranged between the driving end of the driving member and the seat body. The elastic member can drive the seat body to move under the driving of the driving member, so that the brush roller and the screen drum are elastically pressed against each other.

[0016] In one embodiment, the brush roller comprises:

[0017] A roller shaft, the end of which is rotatably connected to the seat body;

[0018] A brush cylinder is sleeved on the roller shaft, and the brush cylinder is provided in multiple groups, and the multiple groups of brush cylinders are arranged along the axial direction of the roller shaft.

[0019] In one embodiment, the brush cartridge comprises:

[0020] A brush module, the brush module comprising a plate body and bristles, the plate body having an arc surface that can fit with the roller surface of the roller shaft, and the bristles are arranged on the side of the plate body away from the arc surface; a plurality of brush modules can be assembled to cover the roller shaft circumferentially;

[0021] A fixing member is used to detachably fix the brush module on the roller shaft.

[0022] In one embodiment, the fixing member includes a fixing ring, which is movably mounted on the roller shaft, and a step surface is provided between the inner wall and the side wall of the fixing ring, and the step surface and the roller surface of the roller shaft can form a fixing cavity for the end of the plate body to be embedded.

[0023] In one embodiment, an elastic cushion layer is provided on the step surface.

[0024] In one embodiment, a threaded through hole is provided on the fixing ring, the threaded through hole is arranged axially along the fixing ring, and a fixing bolt is arranged in the threaded through hole.

[0025] In one embodiment, the shell is provided with a small particle feed bin, a finished product feed bin and a large particle feed bin, the small particle feed bin is used to receive the material screened out by the first screening section, the finished product feed bin is used to receive the material screened out by the second screening section, and the large particle feed bin is used to receive the material discharged from the tail material outlet.

[0026] According to the second aspect, an embodiment provides a screening system for compound fertilizer production, including a self-cleaning drum screen for compound fertilizer production and a finished product conveyor belt, a small particle material conveyor belt and a return material conveyor belt, the self-cleaning drum screen for compound fertilizer production is the self-cleaning drum screen for compound fertilizer production described in any of the above items, and the shell of the self-cleaning drum screen for compound fertilizer production is provided with a small particle discharge bin, a finished product discharge bin and a large particle discharge bin, the small particle discharge bin is used to receive the material screened out by the first screening section, the finished product discharge bin is used to receive the material screened out by the second screening section, the large particle discharge bin is used to receive the material discharged from the tail material outlet, the finished product conveyor belt is used to convey the material discharged from the finished product discharge bin, the small particle material conveyor belt is used to convey the material discharged from the small particle discharge bin to the return material conveyor belt, and the return material conveyor belt is used to convey the material discharged from the large particle discharge bin and the material transmitted by the small particle material conveyor belt.

[0027] According to the self-cleaning drum screen for compound fertilizer production in the above-mentioned embodiment, the screen drum and the driving mechanism cooperate to form a drum-type screening structure. The first screening section screens out materials with too small a particle size, the second screening section screens out finished materials with qualified particle sizes, and materials with too large a particle size are discharged from the tailing material outlet, thereby meeting the screening needs in compound fertilizer production; the coordinated arrangement of the brush roller and the adjusting seat enables the brush roller to be driven by the adjusting seat to move and contact the screen drum when the screen drum needs to be cleaned during operation, and the sieve holes on the screen drum are cleaned by the bristles on the brush roller. Compared with the knocking cleaning method, this helps to reduce the impact of cleaning on the service life of the screen on the screen drum, reduce the replacement frequency, and also helps to improve the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the internal structure of a self-cleaning drum screen for compound fertilizer production in an embodiment;

[0029] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0030] Figure 3 is a schematic structural diagram of a fixing member in an embodiment;

[0031] Figure 4 The figure is a schematic diagram of the overall structure of a screening system for compound fertilizer production in one embodiment.

[0032] In the figure, 100, housing; 101, small particle discharge bin; 102, finished product discharge bin; 103, large particle discharge bin; 104, feed hopper; 105, chute;

[0033] 200, screen drum; 201, mounting shaft; 202, mounting frame; 203, screen mesh; 210, raw material feed port; 220, tailing material discharge port; 230, first screening section; 240, second screening section;

[0034] 300, driving mechanism;

[0035] 400, cleaning mechanism; 410, adjustment seat; 411, seat body; 412, adjustment component; 4121, driving member; 4122, elastic member; 420, brush roller; 421, roller shaft; 422, brush cylinder; 4221, plate brush module; 42211, plate body; 42212, bristles; 4222, fixing member; 42221, step surface; 42222, elastic cushion layer; 42223, fixing bolt;

[0036] 500. Finished product conveyor belt;

[0037] 600. Conveyor belt for small particle materials;

[0038] 700. Return material conveyor belt. DETAILED DESCRIPTION

[0039] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0040] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0041] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0042] In the embodiment of the present application, the sieve drum 200 and the driving mechanism 300 cooperate to form a drum-type screening structure, which can meet the screening needs in the production of compound fertilizers and facilitate the setting of the cleaning mechanism 400 to clean the sieve drum 200; and the matching design of the brush roller 420 and the adjusting seat 410 enables the sieve drum 200 to achieve self-cleaning, that is, when the sieve drum 200 needs maintenance and cleaning, the adjusting seat 410 can drive the brush roller 420 to move to a position that fits closely with the surface of the sieve drum 200, and the brush roller 420 is driven to rotate to effectively clear the blockage of the sieve holes. Compared with the knocking cleaning method, it is more gentle, helps to reduce the impact of cleaning on the service life of the screen 203 on the sieve drum 200, reduces the replacement frequency, and helps to enhance the cleaning effect.

[0043] In one embodiment, a self-cleaning drum screen for compound fertilizer production is disclosed, please refer to Figure 1-3 The self-cleaning drum screen for compound fertilizer production includes: a shell 100 and a screen drum 200, a driving mechanism 300 and a cleaning mechanism 400 arranged on the shell 100.

[0044] In one embodiment, please refer to Figure 1 The screen drum 200 is rotatably arranged in the housing 100, and the screen drum 200 is tilted in the horizontal direction. The driving mechanism 300 is arranged on the housing 100 to drive the screen drum 200 to rotate. Among them, the screen drum 200 has a raw material feed port 210 at one end and a tailing material discharge port 220 at the other end. The end of the screen drum 200 with the raw material feed port 210 is higher than the end with the tailing material discharge port 220. The screen drum 200 is divided into a first screening section 230 and a second screening section 240 along the axial direction. The first screening section 230 is located on the side close to the raw material feed port 210, and the screen hole diameter of the first screening section 230 is smaller than the screen hole diameter of the second screening section 240. By designing the screen drum 200, it can automatically screen out small-particle materials, finished materials and large-particle materials according to the screening needs of compound fertilizers, meet the use requirements, and can achieve continuous screening.

[0045] For example, please refer to Figure 1The screen drum 200 includes a mounting shaft 201, a mounting frame 202 and a screen 203. The mounting shaft 201 is rotatably mounted in the inner cavity of the housing 100 through bearing seats arranged at both ends of the housing 100. The mounting frame 202 is covered outside the mounting shaft 201 and is fixedly connected to the mounting shaft 201. The screen 203 is mounted on the mounting frame 202, and the screen 203 is arranged in sections along the axis direction of the mounting shaft 201 to form a first screening section 230 and a second screening section 240, wherein the screen aperture of the screen 203 of the first screening section 230 is smaller than the screen aperture of the screen 203 of the second screening section 240. For example, the first screening section 230 may use a screen 203 with a screen aperture of 1.2 cm, and the second screening section 240 may use a screen 203 with a screen aperture of 1.8 cm.

[0046] Please refer to Figure 1 , the driving mechanism 300 is arranged at one end of the housing 100 close to the raw material feed port 210. For example, the driving mechanism 300 is a reduction motor, and the output shaft of the reduction motor is coaxially connected to the mounting shaft 201, so that the reduction motor can drive the screen drum 200 to rotate. In some other examples, the driving mechanism 300 may also include a driving motor and a reducer, the driving motor and the reducer are connected by a belt drive, and the output shaft of the reducer is coaxially connected to the mounting shaft 201, so that the driving motor can drive the screen drum 200 to rotate through the reducer. The driving mechanism 300 can also be set as other power output components that can output rotational motion, and any power output component that can drive the screen drum 200 to rotate for screening can be used.

[0047] In one embodiment, please refer to Figure 1 The housing 100 is provided with a small particle feed bin 101, a finished product feed bin 102 and a large particle feed bin 103. The small particle feed bin 101 is used to receive the material screened out by the first screening section 230, the finished product feed bin 102 is used to receive the material screened out by the second screening section 240, and the large particle feed bin 103 is used to receive the material discharged from the tailing material outlet 220. In some embodiments, a feed hopper 104 is further provided on the side of the housing 100 opposite to the raw material feed inlet 210, and the material to be screened can enter the raw material feed inlet 210 through the feed hopper 104, and then be screened by the screen drum 200.

[0048] Exemplarily, the shell 100 is provided with a small particle discharge bin 101, a finished product discharge bin 102 and a large particle discharge bin 103 in the area below the screen drum 200, and the small particle discharge bin 101, the finished product discharge bin 102 and the large particle discharge bin 103 are arranged in sequence along the material direction in the screen drum 200, wherein the finished product discharge bin 102 is inclined compared with the small particle discharge bin 101 and the large particle discharge bin 103, so that the discharge port of the finished product discharge bin 102 is staggered with the discharge ports of the small particle discharge bin 101 and the large particle discharge bin 103, so as to coordinate the arrangement of the corresponding material conveying mechanism.

[0049] In one embodiment, please refer to Figure 1 and 2 The cleaning mechanism 400 includes an adjusting seat 410 and a brush roller 420. The adjusting seat 410 is movably arranged on the shell 100. The brush roller 420 is rotatably assembled on the adjusting seat 410, and the brush roller 420 is arranged on one side of the sieve drum 200 along a direction parallel to the sieve drum 200. The adjusting seat 410 can adjust the contact degree between the brush roller 420 and the sieve drum 200 so that the brush roller 420 can rotate driven by the sieve drum 200 to clean the sieve drum 200.

[0050] When the screen drum 200 needs maintenance and cleaning, the adjustment seat 410 can drive the brush roller 420 to move to a position that is closely fitted with the surface of the screen drum 200, so that the brush roller 420 can be driven by the screen drum 200 to rotate to effectively remove the blockage of the screen hole. The cleaning method is relatively gentle and is not easy to cause damage to the screen mesh 203 on the screen drum 200, which helps to extend the service life of the screen mesh 203, reduce the replacement frequency, and help to enhance the cleaning effect. Moreover, when the screen drum 200 does not need to be cleaned temporarily, the brush roller 420 can be adjusted to separate from the screen drum 200 to reduce the loss of the brush roller 420.

[0051] Exemplarily, two groups of adjustment seats 410 are provided at both ends of the shell 100, and the brush roller 420 is rotatably assembled between the two adjustment seats 410. The two adjustment seats 410 can be adjusted synchronously to drive the brush roller 420 to maintain a parallel state with the screen drum 200 and move closer to or away from the screen drum 200, thereby adjusting whether the brush roller 420 is in contact with the screen drum 200 and the contact tightness.

[0052] In some other embodiments, the brush roller 420 may also be provided with a power source for driving the brush roller 420 to rotate, so that the brush roller 420 can actively rotate to clean the screen drum 200 .

[0053] In one embodiment, please refer to Figure 2 The adjustment seat 410 includes a seat body 411 and an adjustment component 412, wherein the seat body 411 is slidably arranged on the housing 100 along the radial direction of the screen drum 200, and the brush roller 420 is rotatably arranged on the seat body 411; the adjustment component 412 is arranged on the housing 100, and the adjustment component 412 is linked with the seat body 411 to drive the seat body 411 to slide, so that the brush roller 420 abuts against the screen drum 200. By controlling the adjustment component 412 to drive the seat body 411 to slide, the abutment degree of the brush roller 420 and the screen drum 200 can be controlled, which is convenient for adjustment according to actual production needs.

[0054] Exemplarily, a slide groove 105 is provided on the side walls of the shell 100 at both ends of the screen drum 200. The slide groove 105 is defined by two fixed plates arranged in parallel and spaced apart on the shell 100. The slide groove 105 is arranged along the radial direction of the screen drum 200. The seat body 411 is slidably arranged in the slide groove 105. The adjusting component 412 is arranged on the shell 100 to drive the seat body 411 to slide along the slide groove 105, thereby realizing the brush roller 420 approaching or moving away from the screen drum 200.

[0055] For a further embodiment, please refer to Figure 2 The adjusting component 412 includes a driving member 4121 and an elastic member 4122. The driving member 4121 is used to output a linear motion along the sliding direction of the seat body 411. The elastic member 4122 is arranged between the driving end of the driving member 4121 and the seat body 411. The elastic member 4122 can drive the seat body 411 to move under the driving of the driving member 4121, so that the brush roller 420 and the screen drum 200 are elastically pressed against each other. The arrangement of the driving member 4121 and the elastic member 4122 enables the brush roller 420 to move in a small range when it is in contact with the screen drum 200 at different positions, adapts to the local shape change of the screen drum 200, and helps to better clean the screen drum 200.

[0056] Exemplarily, the driving member 4121 is a linear cylinder, and the elastic member 4122 is a spring. The linear cylinder and the spring are both arranged in the slide groove 105 along the length direction of the slide groove 105. One end of the spring is connected to the end of the piston rod of the linear cylinder, and the other end is connected to the seat body 411. The extension of the linear cylinder piston rod can drive the spring to move, and then drive the seat body 411 to move through the spring, so that the brush roller 420 is elastically pressed against the seat body 411.

[0057] In other embodiments, the slide groove 105 can also be set as an arc-shaped slide groove, one end of the arc-shaped slide groove is close to the screen cylinder 200, and the other end is away from the screen cylinder 200, and a rotating arm with a driving motor is used as an adjusting component 412. The adjusting component 412 drives the seat body 411 to slide along the arc-shaped slide groove to adjust the position of the brush roller 420. Of course, other structures that meet design and usage requirements can also be used.

[0058] In one embodiment, please refer to Figure 1 and 2 The brush roller 420 includes a roller shaft 421 and a brush cylinder 422. The end of the roller shaft 421 is rotatably connected to the base body 411. The brush cylinder 422 is sleeved on the roller shaft 421. There are multiple groups of brush cylinders 422, and the multiple groups of brush cylinders 422 are arranged in parallel along the axial direction of the roller shaft 421. The brush cylinder 422 specifically refers to a cylinder structure with bristles 42212 arranged on the outer wall. The split design of the brush cylinder 422 and the roller shaft 421 allows only the brush cylinder 422 to be replaced when the bristles 42212 of the brush roller 420 are excessively worn, thereby reducing the maintenance cost of the brush roller 420.

[0059] In a further embodiment, please refer to Figure 2 The brush cylinder 422 includes a brush module 4221 and a fixing member 4222. The brush module 4221 includes a plate body 42211 and bristles 42212. The plate body 42211 has an arc surface that can fit with the roller surface of the roller shaft 421. The bristles 42212 are arranged on the side of the plate body 4221 away from the arc surface; multiple brush modules 4221 can be assembled to circumferentially cover the roller shaft 421; the fixing member 4222 is used to detachably fix the brush module 4221 on the roller shaft 421.

[0060] Exemplarily, the plate body 42211 is configured as an arc-shaped plate whose cross-sectional curvature matches the curvature of the roller surface of the roller shaft 421. Multiple plate bodies 42211 can be assembled into a cylindrical structure to cover the roller shaft 421, and then fixed to the roller shaft 421 through the fixing member 4222. In this way, when replacing the brush cylinder 422, it is not necessary to disassemble the roller shaft 421, and only the plate brush module 4221 needs to be replaced. In addition, part of the plate brush module 4221 can be selectively replaced according to the wear condition, which helps to further reduce the maintenance cost of the brush roller 420.

[0061] In one embodiment, please refer to Figure 2 and Figure 3 The fixing member 4222 includes a fixing ring, which is movably sleeved on the roller shaft 421. A step surface 42221 is provided between the inner wall and the side wall of the fixing ring. The step surface 42221 and the roller surface of the roller shaft 421 can form a fixing cavity for the end of the plate body 42211 to be embedded. The brush module 4221 can be clamped on the roller shaft 421 through the fixing ring, which is simple and convenient.

[0062] In one embodiment, please refer to Figure 3 An elastic cushion layer 42222 is provided on the step surface 42221. The setting of the elastic cushion layer 42222 helps to improve the clamping effect of the fixing ring on the brush module 4221, so that the fixing ring is not easily separated from the brush module 4221. The elastic cushion layer 42222 can be made of a rubber cushion layer, a polyurethane cushion layer or other materials that meet the design and use requirements.

[0063] In a further embodiment, please refer to Figure 3 The fixing ring is provided with a threaded through hole, which is arranged along the axial direction of the fixing ring, and a fixing bolt 42223 is arranged in the threaded through hole. After the fixing ring is installed in place, the fixing bolt 42223 can be adjusted to abut against the roller surface of the roller shaft 421, further locking the position of the fixing ring to improve the safety of use.

[0064] In an embodiment of a screening system for compound fertilizer production, referring to Figure 4The screening system for compound fertilizer production includes a self-cleaning drum screen for compound fertilizer production, a finished product conveyor belt 500, a small particle material conveyor belt 600 and a return material conveyor belt 700. The self-cleaning drum screen for compound fertilizer production is the self-cleaning drum screen for compound fertilizer production in any of the above embodiments.

[0065] The shell 100 of the self-cleaning drum screen for compound fertilizer production is provided with a small particle discharge bin 101, a finished product discharge bin 102 and a large particle discharge bin 103, wherein the small particle discharge bin 101 is arranged below the first screening section 230, for receiving the material screened out by the first screening section 230; the finished product discharge bin 102 is arranged below the second screening section 240, for receiving the material screened out by the second screening section 240; the large particle discharge bin 103 is arranged below the discharge area of ​​the tailings discharge port 220, for receiving the material discharged from the tailings discharge port 220.

[0066] The receiving area of ​​the finished product conveyor belt 500 is arranged below the discharge port of the finished product discharge bin 102, so that the finished product conveyor belt 500 can convey the material discharged from the finished product discharge bin 102 to the next process. The receiving area of ​​the small particle material conveyor belt 600 is arranged below the discharge port of the small particle discharge bin 101, and the discharge area of ​​the small particle material conveyor belt 600 is located above the return conveyor belt 700, and the receiving area of ​​the return conveyor belt 700 is arranged below the discharge port of the large particle discharge bin 103, so that the small particle material conveyor belt 600 can convey the material discharged from the small particle discharge bin 101 to the return conveyor belt 700, and the large particle material discharged from the large particle discharge bin 103 directly falls to the return conveyor belt 700, and is conveyed by the return conveyor belt 700 back to the previous processing step for re-processing and granulation.

[0067] In one embodiment, referring to Figure 4 , two groups of self-cleaning drum screens for compound fertilizer production can share one finished product conveyor belt 500, which helps to improve the utilization rate of the finished product conveyor belt 500.

[0068] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. A self-cleaning drum screen for compound fertilizer production, characterized in that: include: case; A screen drum, wherein the screen drum is rotatably disposed in the housing and is tilted in the horizontal direction, wherein one end of the screen drum has a raw material feed port and the other end has a tailings discharge port, and the screen drum is divided into a first screening section and a second screening section along the axial direction, wherein the first screening section is located on a side close to the raw material feed port, and the screen hole diameter of the first screening section is smaller than the screen hole diameter of the second screening section; A driving mechanism, the driving mechanism is arranged on the housing and is used to drive the screen drum to rotate; The cleaning mechanism includes an adjustment seat and a brush roller, wherein the adjustment seat is movably arranged on the shell, the brush roller is rotatably assembled on the adjustment seat, and the brush roller is arranged on one side of the screen cylinder in a direction parallel to the screen cylinder, and the adjustment seat can adjust the contact degree between the brush roller and the screen cylinder so that the brush roller can rotate under the drive of the screen cylinder to clean the screen cylinder.

2. The self-cleaning drum screen for compound fertilizer production according to claim 1, characterized in that: The adjustment seat comprises: A seat body, wherein the seat body is slidably disposed on the housing along the radial direction of the screen drum, and the brush roller is rotatably disposed on the seat body; An adjusting component is arranged on the shell, and the adjusting component is linked with the seat body to drive the seat body to slide so that the brush roller abuts against the screen cylinder.

3. The self-cleaning drum screen for compound fertilizer production according to claim 2, characterized in that: The adjusting component comprises: A driving member, the driving member is used to output a linear motion along the sliding direction of the seat body; An elastic member is arranged between the driving end of the driving member and the seat body. The elastic member can drive the seat body to move under the driving of the driving member, so that the brush roller and the screen drum are elastically pressed against each other.

4. The self-cleaning drum screen for compound fertilizer production according to claim 2, characterized in that: The brush roller comprises: A roller shaft, the end of which is rotatably connected to the seat body; A brush cylinder is sleeved on the roller shaft, and the brush cylinder is provided in multiple groups, and the multiple groups of brush cylinders are arranged along the axial direction of the roller shaft.

5. The self-cleaning drum screen for compound fertilizer production according to claim 4, characterized in that: The brush cartridge comprises: A brush module, the brush module comprising a plate body and bristles, the plate body having an arc surface that can fit with the roller surface of the roller shaft, and the bristles are arranged on the side of the plate body away from the arc surface; a plurality of brush modules can be assembled to cover the roller shaft circumferentially; A fixing member is used to detachably fix the brush module on the roller shaft.

6. The self-cleaning drum screen for compound fertilizer production according to claim 5, characterized in that: The fixing member comprises a fixing ring, which is movably sleeved on the roller shaft. A step surface is provided between the inner wall and the side wall of the fixing ring. The step surface and the roller surface of the roller shaft can form a fixing cavity for the end of the plate body to be embedded.

7. The self-cleaning drum screen for compound fertilizer production according to claim 6, characterized in that: An elastic cushion layer is arranged on the step surface.

8. The self-cleaning drum screen for compound fertilizer production according to claim 6, characterized in that: The fixing ring is provided with a threaded through hole, the threaded through hole is arranged along the axial direction of the fixing ring, and a fixing bolt is arranged in the threaded through hole.

9. The self-cleaning drum screen for compound fertilizer production according to any one of claims 1 to 8, characterized in that: The shell is provided with a small particle feed bin, a finished product feed bin and a large particle feed bin. The small particle feed bin is used to receive the material screened out by the first screening section, the finished product feed bin is used to receive the material screened out by the second screening section, and the large particle feed bin is used to receive the material discharged from the tail material discharge port.

10. A screening system for compound fertilizer production, characterized in that: It comprises a self-cleaning drum screen for compound fertilizer production, a finished product conveyor belt, a small particle material conveyor belt and a return material conveyor belt, wherein the self-cleaning drum screen for compound fertilizer production is the self-cleaning drum screen for compound fertilizer production according to any one of claims 1 to 8, and the shell of the self-cleaning drum screen for compound fertilizer production is provided with a small particle discharge bin, a finished product discharge bin and a large particle discharge bin, the small particle discharge bin is used to receive the material screened out by the first screening section, the finished product discharge bin is used to receive the material screened out by the second screening section, the large particle discharge bin is used to receive the material discharged from the tail material discharge port, the finished product conveyor belt is used to convey the material discharged from the finished product discharge bin, the small particle material conveyor belt is used to convey the material discharged from the small particle discharge bin to the return material conveyor belt, and the return material conveyor belt is used to convey the material discharged from the large particle discharge bin and the material transmitted by the small particle material conveyor belt.

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