Anti-blocking screw conveyor for urea aqueous solution production

Abstract

The application discloses a kind of anti-blocking screw conveyors for urea solution production, belong to conveyer technical field, including upper big and small hopper, screw feeding unit and anti-blocking unit are installed on hopper, discharge port is opened on the inner wall of hopper, the input end of screw feeding unit is communicated with discharge port, for conveying urea outward;Anti-blocking unit includes rotating shaft and cylinder, cylinder is slidably connected outside rotating shaft along the axial direction, stirring structure is arranged outside cylinder, for stirring urea in hopper;Driving module is also installed on hopper.The urea solution production anti-blocking screw conveyer, the position of stirring structure is changed by driving module, the action position of stirring structure is adjusted in real time, improve the stirring effect of urea.On the other hand, stirring structure can also move along the axial direction while rotating in the circumferential direction, can increase the action range of stirring structure, can realize stirring urea at bottom from different directions.

Description

Technical Field

[0001] This invention belongs to the field of conveyor technology, and particularly relates to an anti-clogging screw conveyor for the production of urea aqueous solution. Background Technology

[0002] In the urea aqueous solution production process, the screw conveyor is a key piece of equipment for transferring urea granules or powder. Its core function is to propel the urea material along the conveying pipeline by rotating the screw blades. It has advantages such as compact structure, stable conveying efficiency, and small footprint. It can adapt to the continuous and large-scale material transfer needs in the urea production process, ensuring the smooth connection of the entire production chain. It is an indispensable core component for material conveying in the urea aqueous solution production process.

[0003] Urea is prone to clumping and blockage during transportation, mainly due to its material properties and environmental factors. Firstly, urea is highly hygroscopic; when the production environment is humid, urea particles easily absorb moisture from the air, increasing inter-particle adhesion and gradually forming lumpy structures. Secondly, if some urea is not completely cooled before storage or transportation, residual heat accelerates moisture evaporation and recondensation, further exacerbating particle agglomeration. Furthermore, the relatively enclosed internal space of traditional screw conveyors allows clumped urea to easily become stuck between the screw blades and the pipe wall, reducing transportation efficiency and, in severe cases, causing the screw blades to jam, equipment downtime, and increased production maintenance costs and failure risks.

[0004] To address the problem of urea caking, some existing screw conveyors incorporate a fixed agitator at the bottom of the storage hopper. This mechanism typically consists of agitator blades fixed to the inner wall of the hopper and a drive motor. The rotation of the agitator blades disperses the urea within the hopper. However, this fixed agitator has significant drawbacks: the agitator blades' agitation range is limited to the area covered by their rotation radius, failing to comprehensively agitate urea at different axial positions within the hopper. This results in urea caking still occurring in areas far from the agitator blades. Furthermore, the fixed agitator position is unsuitable for varying urea accumulation heights within the hopper. When the urea accumulation height changes, the agitation effect significantly decreases, failing to fundamentally solve the problem of urea caking and clogging the screw conveyor. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of poor performance of fixed stirring mechanisms in the prior art, and to propose an anti-clogging screw conveyor for the production of urea aqueous solution.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A clogging-resistant screw conveyor for producing urea aqueous solution includes a storage hopper that is wider at the top and narrower at the bottom. A screw feeding unit and an anti-clogging unit are installed on the storage hopper. A discharge port is provided on the inner wall of the storage hopper. The input end of the screw feeding unit is connected to the discharge port for conveying urea outward.

[0008] The anti-clogging unit includes a rotating shaft and a cylinder. The cylinder is slidably connected to the outside of the rotating shaft along the axial direction. A stirring structure is provided on the outside of the cylinder for stirring the urea in the storage hopper.

[0009] The storage hopper is also equipped with a drive module, which is used to drive the cylinder to slide axially on the rotating shaft, so that the stirring structure can rotate with the rotating shaft and move axially along the rotating shaft.

[0010] Preferably, the storage hopper has mounting openings on its two opposite side walls, and mounting seats are fixedly connected to the mounting openings. The two ends of the rotating shaft are rotatably connected to the two mounting seats, and the drive module is installed inside the mounting seats.

[0011] Preferably, the drive module includes a spring, which is fixedly connected in one of the mounting seats, and the other end of the spring acts on the end face of the cylinder, causing the cylinder to tend to move away from the spring.

[0012] Another mounting base is fixedly connected to an electromagnet, and a first permanent magnet is installed at the end of the cylinder away from the spring. The electromagnet and the first permanent magnet are arranged opposite to each other, so that when the electromagnet is energized, it can generate a magnetic field that repels the first permanent magnet, so that the cylinder is subjected to a thrust in the opposite direction to the force of the spring. When the current of the electromagnet changes, it can cooperate with the spring to drive the cylinder to move axially.

[0013] Preferably, the drive module further includes two sets of movable rings, one of which is fixedly connected to the end of the spring near the cylinder, and the other is located near the electromagnet, with the first permanent magnet disposed on the side wall of the movable ring.

[0014] Two fixed rings are integrally formed at both ends of the cylinder, and the two fixed rings abut against the two movable rings respectively.

[0015] The outer peripheral walls of both the fixed ring and the movable ring are fitted to the inner peripheral wall of the mounting base.

[0016] Preferably, the stirring structure is a stirring blade or a stirring drum.

[0017] Preferably, when the stirring structure is a stirring blade, the number of stirring blades is provided in multiple sets. The stirring blade located in the middle of the cylinder is arranged perpendicular to the axis of the cylinder, and the stirring blades located on both sides of the cylinder are inclined and have an angle with the axis of the cylinder.

[0018] Preferably, the cross-section of the stirring blade has a wide face and a narrow face, and the wide face of the stirring blade is arranged along the axial direction of the cylinder, while the narrow face of the stirring blade is arranged along the circumference of the cylinder.

[0019] Preferably, when the stirring structure is a stirring cylinder, the stirring cylinder is fixedly connected to the outside of the cylinder body, and the stirring cylinder and the cylinder body are coaxially arranged. Multiple sets of sliding grooves are opened on the inner wall of the stirring cylinder along its axial direction. The multiple sets of sliding grooves are arranged in a circumferential array around the axis of the stirring cylinder. Multiple through grooves are opened on the stirring cylinder, which are respectively connected to each sliding groove.

[0020] A drive rod is slidably connected in the chute, and a stirring blade is rotatably connected in the through groove. The drive rod is simultaneously linked with multiple stirring blades, so that when the drive rod slides along the axial direction of the stirring cylinder, it will cause the stirring blades to swing.

[0021] The end of the drive rod is fixedly connected to a drive head. There is a pushing module between the drive head and the end face of the mixing drum, so that the drive head is always in contact with the inclined side wall of the storage hopper. When the drive rod rotates with the mixing drum, the inclined side wall of the storage hopper will act on the drive head, causing the drive rod to move back and forth.

[0022] Preferably, a rotating wheel is rotatably connected inside the through groove, and the stirring blade is fixedly connected to the peripheral wall of the rotating wheel; the peripheral wall of the rotating wheel and the outer wall of the drive rod are respectively provided with intermeshing teeth, and when the drive rod moves, the rotating wheel and the stirring blade are driven to rotate by the action of the teeth.

[0023] Preferably, the driving module includes a second permanent magnet fixedly connected to the driving head and a third permanent magnet fixedly connected to the end face of the stirring drum. The second and third permanent magnets are arranged correspondingly, and the magnetic poles on their opposite sides are the same, so that the driving head has a tendency to move away from the stirring drum.

[0024] In summary, the technical effects and advantages of this invention are as follows: This anti-clogging screw conveyor for urea aqueous solution production improves the stirring effect on urea by changing the position of the stirring structure through the drive module and adjusting its effective position in real time. Furthermore, the stirring structure can rotate circumferentially while also moving axially, increasing its effective range and allowing for stirring of the urea at the bottom from different directions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a top view of the structure of the present invention;

[0027] Figure 3 for Figure 2 Schematic diagram of the AA-direction cross-section structure;

[0028] Figure 4 This is a schematic diagram of the structure of the stirring blade in this invention;

[0029] Figure 5 This is a schematic diagram of the disassembled structure of the drive module and the cylinder in this invention;

[0030] Figure 6 This is a schematic diagram of the structure of the stirring tank in this invention;

[0031] Figure 7 This is a schematic diagram showing the positional relationship between the sliding groove and the through groove on the stirring cylinder in this invention;

[0032] Figure 8 This is a schematic diagram illustrating the interaction between the drive rod and the stirring plate in this invention;

[0033] Figure 9 This is a schematic diagram of the internal structure of the stirring tank in this invention.

[0034] In the diagram: 1. Storage hopper; 2. Screw feeding unit; 3. Rotating shaft; 4. Cylinder; 5. Mounting base; 6. Mixing drum; 7. Mixing blades; 8. Drive rod;

[0035] 11. First sidewall; 12. Second sidewall; 13. Discharge port; 41. Stirring blade; 42. Fixed ring; 51. Movable ring; 511. Spring; 52. First permanent magnet; 521. Electromagnet; 61. Through groove; 62. Slide groove; 63. Third permanent magnet; 71. Rotating wheel; 81. Drive head; 82. Second permanent magnet. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] like Figures 1-9 As shown, an anti-clogging screw conveyor for urea aqueous solution production includes a storage hopper 1 that is larger at the top and smaller at the bottom. A screw feeding unit 2 and an anti-clogging unit are installed on the storage hopper 1. A discharge port 13 is provided on the inner wall of the storage hopper 1. The input end of the screw feeding unit 2 is connected to the discharge port 13 for conveying urea outward.

[0038] It should be noted that the storage hopper 1 has two sets of first sidewalls 11 and two sets of second sidewalls 12; each of the first sidewalls 11 and second sidewalls 12 is inclined, and the first sidewalls 11 and second sidewalls 12 together form the discharge space of the storage hopper 1. This concentrates the material at the bottom, facilitating the outward conveying of the material. The discharge port 13 is installed on one of the first sidewalls 11, and the anti-blocking unit is installed between the two second sidewalls 12.

[0039] The spiral feeding unit 2 includes an inclined straight pipe with the bottom of the straight pipe connected to the discharge port 13. Spiral blades are installed inside the straight pipe. The spiral blades are driven by a motor installed outside the storage hopper 1. When the spiral blades rotate, they will transport the material outward along the straight pipe.

[0040] The anti-clogging unit includes a rotating shaft 3 and a cylinder 4. The cylinder 4 is slidably connected to the outside of the rotating shaft 3 along the axial direction. The outside of the cylinder 4 is equipped with a stirring structure for stirring the urea in the storage hopper 1 to prevent the urea from accumulating and clumping due to long-term accumulation, thereby playing the role of anti-clogging.

[0041] The rotating shaft 3 is driven by a motor located outside the storage hopper 1, and the cylinder 4 and the rotating shaft 3 are connected by a key, so that the cylinder 4 can rotate circumferentially with the rotating shaft 3, and the cylinder 4 can also move along the axial direction of the rotating shaft 3.

[0042] The storage hopper 1 is also equipped with a drive module, which is used to drive the cylinder 4 to slide axially on the rotating shaft 3, so that the stirring structure can rotate with the rotating shaft 3 and move axially along the rotating shaft 3.

[0043] It should be noted that in this application, the stirring structure is indirectly mounted on the rotating shaft 3 via the cylinder 4. On the one hand, the position of the stirring structure can be changed by the drive module, and the effective position of the stirring structure can be adjusted in real time to improve the stirring effect on urea. On the other hand, the stirring structure can move axially while rotating circumferentially, which can increase the effective range of the stirring structure and achieve stirring of the urea at the bottom from different directions.

[0044] Furthermore, the specific installation method of the rotating shaft 3 is as follows: There are mounting ports on the two opposite side walls of the storage hopper 1, and mounting seats 5 are fixedly connected in the mounting ports. The two ends of the rotating shaft 3 are respectively rotatably connected in the two mounting seats 5, and the drive module is installed inside the mounting seats 5.

[0045] The mounting base 5 is a pipe structure with one end closed and the other end open. The rotating shaft 3 is coaxially connected to the mounting base 5. At the same time, the open end of the mounting base 5 is slanted and flush with the side wall of the storage hopper 1.

[0046] It should be noted that the drive module includes a spring 511, which is fixedly connected in one of the mounting bases 5. The other end of the spring 511 acts on the end face of the cylinder 4, causing the cylinder 4 to tend to move away from the spring 511.

[0047] An electromagnet 521 is fixedly connected inside another mounting base 5. A first permanent magnet 52 is installed at the end of the cylinder 4 away from the spring 511. The electromagnet 521 and the first permanent magnet 52 are arranged opposite to each other so that when the electromagnet 521 is energized, it can generate a magnetic field that repels the first permanent magnet 52, so that the cylinder 4 is subjected to a thrust in the opposite direction to the force of the spring 511. When the current of the electromagnet 521 changes, it can cooperate with the spring 511 to drive the cylinder 4 to move axially.

[0048] In other words, the cylinder 4 in this application is simultaneously subjected to the thrust of the spring 511 and the electromagnet 521 in the axial direction. Specifically, when the current of the electromagnet 521 decreases and the thrust decreases, the cylinder 4 will move closer to the electromagnet 521. When the current of the electromagnet 521 increases and the thrust increases, the cylinder 4 will move away from the electromagnet 521. Therefore, in this application, the position of the cylinder 4 can be adjusted along the axial direction simply by controlling the strength of the current of the electromagnet 521.

[0049] As a further optimization, the drive module also includes two sets of movable rings 51. One movable ring 51 is fixedly connected to the end of the spring 511 near the cylinder 4, and the other movable ring 51 is located near the electromagnet 521. The first permanent magnet 52 is located on the side wall of the movable ring 51. Fixed rings 42 are integrally formed at both ends of the cylinder 4, and the two fixed rings 42 abut against the two movable rings 51 respectively.

[0050] In other words, in this embodiment, the spring 511 and the electromagnet 521 do not directly contact the cylinder 4, but indirectly through the movable ring 51 and the fixed ring 42. This not only reduces the assembly difficulty, but also increases the contact area and makes the thrust more uniform.

[0051] Furthermore, it should be noted that the outer peripheral walls of both the fixed ring 42 and the movable ring 51 are fitted to the inner peripheral wall of the mounting base 5. The advantage of this design is that the double-layer isolation provided by the fixed ring 42 and the movable ring 51 prevents urea particles from entering the interior of the mounting base 5. Simultaneously, when it is necessary to clean urea particles from the opening of the mounting base 5, cleaning can be achieved by the back-and-forth movement of the fixed ring 42 and the movable ring 51.

[0052] Furthermore, the stirring structure can be either a stirring blade 41 or a stirring drum 6, which can be selected according to actual needs. For example, when factors such as the particle size of urea and ambient humidity reduce the probability of urea agglomeration, stirring blade 41 can be selected. If urea is more prone to agglomeration, stirring drum 6 can be selected.

[0053] Specifically, when the stirring structure consists of stirring blades 41, multiple sets of stirring blades 41 are provided. The stirring blades 41 located in the middle of the cylinder 4 are arranged perpendicular to the axis of the cylinder 4, while the stirring blades 41 located on both sides of the cylinder 4 are arranged at an angle to the axis of the cylinder 4, thus being inclined. By setting the stirring blades 41 at different angles, sufficient contact between the stirring blades 41 and urea can be achieved, thereby improving the stirring effect.

[0054] Furthermore, the cross-section of the stirring blade 41 has a wide face and a narrow face; simply put, the cross-section of the stirring blade 41 is rectangular. The wide face of the stirring blade 41 is arranged along the axial direction of the cylinder 4, and the narrow face is arranged along the circumference of the cylinder 4. When the stirring blade 41 rotates around the rotating shaft 3, the surface where the stirring blade 41 interacts with urea is the shorter side of the rectangle, i.e., the narrow face, to reduce the resistance of the stirring blade 41 and the rotational resistance of the rotating shaft 3, ensuring that the rotational speed of the rotating shaft 3 can be maintained at a stable rate. When the stirring blade 41 moves with the cylinder 4 along the axis of the rotating shaft 3, the surface where the stirring blade 41 interacts with urea is the longer side of the rectangle, i.e., the wide face, thereby maximizing the interaction area between the stirring blade 41 and urea and promoting the flow of urea.

[0055] Specifically, when the stirring structure is a stirring cylinder 6, the stirring cylinder 6 is fixedly connected to the outside of the cylinder 4, and the stirring cylinder 6 and the cylinder 4 are coaxially arranged. Multiple sets of sliding grooves 62 are opened on the inner wall of the stirring cylinder 6 along its axial direction. The multiple sets of sliding grooves 62 are arranged in a circumferential array around the axis of the stirring cylinder 6. Multiple through grooves 61 are opened on the stirring cylinder 6, which are respectively connected to each sliding groove 62.

[0056] The stirring drum 6 can also be configured as an integral structure with the drum body 4. The through groove 61 on the stirring drum 6 is arranged along the radial direction of the stirring drum 6. That is to say, the sliding groove 62 and the corresponding through groove 61 are in the same plane.

[0057] A drive rod 8 is slidably connected within the chute 62, and a stirring blade 7 is rotatably connected within the through groove 61. The drive rod 8 is simultaneously linked with multiple stirring blades 7, causing the stirring blades 7 to oscillate as the drive rod 8 slides along the axial direction of the mixing cylinder 6. In other words, the linear motion of the drive rod 8 can be converted into the rotational motion of the stirring blades 7. When the drive rod 8 continues to translate, the stirring blades 7 will continue to rotate. When the drive rod 8 remains stationary, the stirring blades 7 will remain at the corresponding angle.

[0058] The end of the drive rod 8 is fixedly connected to the drive head 81. There is a push module between the drive head 81 and the end face of the mixing drum 6, so that the drive head 81 is always in contact with the inclined side wall of the storage hopper 1. When the drive rod 8 rotates with the mixing drum 6, the inclined side wall of the storage hopper 1 will act on the drive head 81, causing the drive rod 8 to move back and forth.

[0059] Specifically, since the storage hopper 1 is larger at the top and smaller at the bottom, and its side wall is inclined, when the mixing drum 6 rotates, the distance between the drive head 81 and the side wall of the storage hopper 1 is constantly changing, while the other end of the drive head 81 is always subjected to the force from the push module. Therefore, the drive head 81 will move back and forth under the action of the side wall of the storage hopper 1, thereby realizing the reciprocating push of the drive rod 8.

[0060] It should be noted that since the cylinder 4 can move axially, this embodiment has two working modes. In one mode, the drive head 81 is kept in contact with the side wall of the storage hopper 1, thereby enabling the drive rod 8 to drive the stirring blade 7 to oscillate back and forth. In the other mode, the drive head 81 is moved away from the side wall of the storage hopper 1 and kept in a separated state. In this case, the positions of the drive rod 8 and the stirring blade 7 remain unchanged, and the stirring blade 7 rotates and stirs with the stirring cylinder 6 at a fixed angle.

[0061] The specific linkage between the drive rod 8 and the stirring blade 7 is as follows: A rotating wheel 71 is rotatably connected inside the through groove 61, and the stirring blade 7 is fixedly connected to the peripheral wall of the rotating wheel 71; the peripheral wall of the rotating wheel 71 and the outer wall of the drive rod 8 are respectively provided with meshing teeth. When the drive rod 8 moves, the rotating wheel 71 and the stirring blade 7 are driven to rotate through the action of the teeth. Furthermore, the rotating wheel 71 is rotatably mounted inside the through groove 61 through a damping bearing, so that when the drive head 81 does not contact the side wall of the storage hopper 1, the stirring blade 7 can be maintained at a specific angle for stirring.

[0062] Specifically, the pushing module can be implemented using a spring, with both ends of the spring fixedly connected to the stirring drum 6 and the driving head 81, respectively. However, in this embodiment, to reduce dead zones where urea accumulates, the pushing module includes a second permanent magnet 82 fixedly connected to the driving head 81 and a third permanent magnet 63 fixedly connected to the end face of the stirring drum 6. The second permanent magnet 82 and the third permanent magnet 63 are correspondingly arranged, and their opposite sides have the same magnetic poles, giving the driving head 81 a tendency to move away from the stirring drum 6. It should be noted that using magnets to achieve contactless force transmission can reduce urea residue. Furthermore, the stirring drum 6, storage hopper 1, etc., in this application are all made of non-ferromagnetic materials, such as stainless steel, to avoid affecting the implementation of the solution.

[0063] The working principle is as follows: When using this application, the screw feeding unit 2 is started, causing the screw blades to rotate and continuously conveying urea upwards. To avoid caking and blockage, the rotating shaft 3 needs to be started, causing it to rotate continuously and drive the stirring structure on the cylinder 4 to stir the urea and reduce caking.

[0064] When optimization and adjustment are needed, electromagnet 521 can be activated, and by changing the current of electromagnet 521 in conjunction with the action of spring 511, the axial position of cylinder 4 can be adjusted, thereby changing the interaction area between the stirring structure and urea to improve the stirring effect.

[0065] Furthermore, when using the mixing drum 6, the reciprocating motion of the driving rod 8 can be achieved by the continuous contact between the driving head 81 and the inclined side wall of the storage hopper 1, and the driving rod 8 drives multiple mixing blades 7 to swing back and forth, thereby increasing the contact range between the mixing blades 7 and urea and improving the mixing effect of urea.

[0066] Meanwhile, based on the characteristic that the cylinder 4 can move axially in this application, the drive head 81 can be moved away from the side wall of the storage hopper 1, so that the stirring plate 7 can rotate at a fixed angle, thereby reducing energy consumption.

[0067] It should also be noted that during use, the urea in the mounting base 5 can be pushed out by the fixed ring 42 and the movable ring 51 through the axial movement of the cylinder 4, thus avoiding long-term accumulation. In addition, the drive head 81 in this application is in continuous contact with the side wall of the storage hopper 1, which can also clean the small amount of urea adhering to the side wall of the storage hopper 1.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A clog-resistant screw conveyor for urea production, comprising a storage hopper that is wider at the top and narrower at the bottom, characterized in that, The storage hopper is equipped with a screw feeding unit and an anti-clogging unit. The inner wall of the storage hopper is provided with a discharge port. The input end of the screw feeding unit is connected to the discharge port to transport urea outward. The anti-clogging unit includes a rotating shaft and a cylinder. The cylinder is slidably connected to the outside of the rotating shaft along the axial direction. A stirring structure is provided on the outside of the cylinder for stirring the urea in the storage hopper. When the stirring structure is a stirring cylinder, the stirring cylinder is fixedly connected to the outside of the cylinder body, and the stirring cylinder and the cylinder body are coaxially arranged. Multiple sets of sliding grooves are opened on the inner wall of the stirring cylinder along its axial direction. The multiple sets of sliding grooves are arranged in a circumferential array around the axis of the stirring cylinder. Multiple through grooves are opened on the stirring cylinder, which are respectively connected to each sliding groove. A drive rod is slidably connected in the chute, and a stirring blade is rotatably connected in the through groove. The drive rod is simultaneously linked with multiple stirring blades, so that when the drive rod slides along the axial direction of the stirring cylinder, it will cause the stirring blades to swing. The end of the drive rod is fixedly connected to a drive head. There is a push module between the drive head and the end face of the mixing drum, so that the drive head is always in contact with the inclined side wall of the storage hopper. When the drive rod rotates with the mixing drum, the inclined side wall of the storage hopper will act on the drive head, causing the drive rod to move back and forth. The storage hopper is also equipped with a drive module, which includes a spring. The spring is fixedly connected in one of the mounting seats, and the other end of the spring acts on the end face of the cylinder, causing the cylinder to tend to move away from the spring. Another mounting base is fixedly connected to an electromagnet, and a first permanent magnet is installed at the end of the cylinder away from the spring. The electromagnet and the first permanent magnet are arranged opposite to each other, so that when the electromagnet is energized, it can generate a magnetic field that repels the first permanent magnet, so that the cylinder is subjected to a thrust in the opposite direction to the force of the spring. When the current of the electromagnet changes, it can cooperate with the spring to drive the cylinder to move axially. The drive module is used to drive the cylinder to slide axially on the rotating shaft, so that the stirring structure can rotate with the rotating shaft and move axially along the rotating shaft; to adjust the working position of the stirring structure, so that the drive head is away from the side wall of the storage hopper, and the stirring blades rotate at a fixed angle.

2. The anti-clogging screw conveyor for urea production according to claim 1, characterized in that, The storage hopper has mounting openings on its two opposite side walls. Mounting seats are fixedly connected to the mounting openings. The two ends of the rotating shaft are rotatably connected to the two mounting seats respectively. The drive module is installed inside the mounting seats.

3. The anti-clogging screw conveyor for urea production according to claim 1, characterized in that, The drive module also includes two sets of movable rings, one of which is fixedly connected to the end of the spring near the cylinder, and the other is located near the electromagnet, with the first permanent magnet located on the side wall of the movable ring. Two fixed rings are integrally formed at both ends of the cylinder, and the two fixed rings abut against the two movable rings respectively. The outer peripheral walls of both the fixed ring and the movable ring are fitted to the inner peripheral wall of the mounting base.

4. The anti-clogging screw conveyor for urea production according to claim 1, characterized in that, When the stirring structure is a stirring blade, there are multiple sets of stirring blades. The stirring blade located in the middle of the cylinder is arranged perpendicular to the axis of the cylinder, and the stirring blades located on both sides of the cylinder are inclined and have an angle with the axis of the cylinder.

5. The anti-clogging screw conveyor for urea production according to claim 4, characterized in that, The cross-section of the stirring blade has a wide face and a narrow face, with the wide face of the stirring blade arranged along the axial direction of the cylinder and the narrow face of the stirring blade arranged along the circumference of the cylinder.

6. The anti-clogging screw conveyor for urea production according to claim 1, characterized in that, A rotating wheel is rotatably connected inside the through groove, and the stirring blade is fixedly connected to the peripheral wall of the rotating wheel; the peripheral wall of the rotating wheel and the outer wall of the drive rod are respectively provided with intermeshing teeth, and when the drive rod moves, the rotating wheel and the stirring blade are driven to rotate by the action of the teeth.

7. The anti-clogging screw conveyor for urea production according to claim 1, characterized in that, The driving module includes a second permanent magnet fixedly connected to the drive head and a third permanent magnet fixedly connected to the end face of the stirring drum. The second and third permanent magnets are arranged correspondingly, and the magnetic poles on their opposite sides are the same, so that the drive head has a tendency to move away from the stirring drum.

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