Urea particle screening equipment

Abstract

The utility model relates to the technical field of urea particle production, in particular to urea particle screening equipment which comprises a screening mechanism, the screening mechanism comprises a shell, two first square holes are formed in the outer walls of the two sides of the shell at equal intervals, and a group of second square holes are formed in the positions, close to the top, of the inner walls of the two sides of the shell; sliding grooves are formed in the positions, located below the second square holes, of the inner walls of the two sides of the shell. The trembling mechanism is fixed in the shell and can screen urea particles; the replacing mechanism is fixed to the top of the shell and can replace the screen frame. According to the urea particle screening device, the first motor is driven to drive the multiple screen frames to vibrate at the same time to screen urea particles, the mechanical linkage is effectively improved, in addition, the screen frames are limited through the first limiting rod or the second limiting rod, and when the screen frames need to be replaced, the replacement mechanism can be conveniently operated and replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to urea particle production technical field, concretely relates to urea particle screening equipment. BACKGROUND

[0002] In the field of modern chemical production, urea as a very important basic chemical product, its production process each link is widely concerned, wherein urea particle screening equipment has the indispensable role in guaranteeing urea product quality.

[0003] The application scenarios of urea are wide, covering multiple fields such as agriculture and industry. Different application fields have completely different requirements for the size of urea particles. Urea particle screening equipment usually needs to replace the screen according to the work requirements. For example, when producing urea for agricultural fertilization, particles with a diameter of 1-2mm may need to be screened. When producing certain fine chemicals in industrial production, the size of urea particles may be required to be more stringent, such as only particles with a diameter of 0.5-1mm. In addition, when the screen is damaged, severely clogged and cannot be cleaned, or reaches the end of its service life, the screen also needs to be replaced to ensure the accuracy and efficiency of screening. However, the existing ones usually need to be replaced manually, which needs to be disassembled and fixed, and is time-consuming and troublesome to replace. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present utility model is to provide a urea particle screening equipment, which can simultaneously drive multiple screen racks to vibrate and screen urea particles by driving a motor. The mechanical linkage is effectively improved. In addition, the screen racks are limited by the limiting rods one or two. When the screen racks need to be replaced, the replacement mechanism can be operated and replaced conveniently.

[0005] The urea particle screening equipment comprises:

[0006] The screening mechanism comprises a shell, two square holes one are formed on the outer walls of the two sides of the shell at equal intervals, a group of square holes two are formed on the inner walls of the two sides of the shell near the top positions, and a sliding groove is formed on the inner walls of the two sides of the shell below the square holes two;

[0007] The vibration mechanism is fixed in the shell and can screen urea particles;

[0008] The replacement mechanism is fixed on the top of the shell and can replace the screen rack;

[0009] The limiting and sealing mechanism is provided with two, which are respectively fixed in the interiors of the two sides of the shell and can seal the square hole one position of the shell.

[0010] Further, the vibration mechanism comprises:

[0011] Square plates are arranged with two, respectively fixed with the inner wall of the shell at the bottom of both ends;

[0012] U-shaped frame one is arranged with a group, which is slidingly inserted with the inner wall of the shell, and one end of the U-shaped frame one is fixedly connected with a square rod one;

[0013] Limiting rods one are arranged with two, respectively fixed between the two square rods one and the one end of the two U-shaped frames one, and the limiting rods one are slidingly inserted with the screen frame;

[0014] Square rods three are arranged with two, fixed on the limiting rods one at equal intervals, and the limiting rods two are fixedly connected between the outer walls of one end of the two square rods three, and the limiting rods two are slidingly inserted with the screen frame;

[0015] Squares are fixed at both ends of the U-shaped frame one, and springs are fixedly connected between the outer wall of the square and the outer wall of the square plate.

[0016] Preferably, the tremor mechanism comprises:

[0017] A first motor is fixed with the outer wall of the shell, and the rotating shaft of the first motor is fixedly connected with a round rod, and the outer wall of the round rod is fixedly connected with two arc-shaped frames at equal intervals.

[0018] Preferably, the replacement mechanism comprises:

[0019] A U-shaped frame two is fixed with the outer wall of the shell, and the outer wall of the U-shaped frame two is fixedly connected with a second motor, and the rotating shaft of the second motor is fixedly connected with a threaded rod;

[0020] A U-shaped frame three is screwed on the outer wall of the threaded rod and slidingly connected with the inner wall of the U-shaped frame two.

[0021] Preferably, the replacement mechanism comprises:

[0022] L-shaped frames are arranged with two groups, respectively fixed on the outer walls of both sides of the U-shaped frame three.

[0023] Preferably, the replacement mechanism comprises:

[0024] Fixed frames are arranged with two, respectively fixed at both ends of the U-shaped frame three, and the outer wall of the fixed frame is fixedly connected with a frame;

[0025] Toothed plates are arranged with two, fixed on the outer wall of one of the second motors at the center;

[0026] Square holes three are opened on one of the frames at the middle of the two toothed plates;

[0027] Spring telescopic rods one are slidingly arranged between the two toothed plates, and one end of the spring telescopic rod one is provided with an inclined angle;

[0028] The third motor is slid on the outer wall of the one side of the toothed plate, the rotating shaft of the third motor is rotationally connected with the bottom of the spring telescopic rod, two straight gears are equidistantly and fixedly connected with the rotating shaft of the third motor, and the straight gears are in mesh transmission with the toothed plate.

[0029] Preferably, the limiting sealing mechanism comprises:

[0030] The two baffle plates are slidably inserted into the sliding groove, and square rods four are fixedly connected between the outer walls of the two ends of the baffle plates.

[0031] The second spring telescopic rod is fixed between the outer wall of the baffle plate and the inner wall of the sliding groove.

[0032] The utility model discloses the beneficial effects of:

[0033] 1. by driving the first motor can drive multiple screen frame to produce tremor simultaneously to the urea particle and carry out screening, effectively improve the mechanical linkage, in addition, by the limiting rod one or limiting rod two to the screen frame is positioned, when needing to replace the screen frame, convenient replacement mechanism operation replaces.

[0034] 2. by replacement mechanism, personnel can replace the screen frame of any position on the shell conveniently, need not to disassemble other parts, can complete quick replacement, effectively improve work efficiency and operation convenience.

[0035] 3. by limiting sealing mechanism, the square hole one of the both sides of the shell can be sealed, and the screen frame in the shell can also be sealed, prevent the screen frame from shaking when shaking, make one end to be stuck in the square hole one, cause the component damage, in addition, when replacing is completed, the baffle plate moves down along the sliding groove, and the two screen frames that are close together can also be separated, effectively improve work stability. BRIEF DESCRIPTION OF DRAWINGS

[0036] The utility model makes further explanation in combination with the drawings.

[0037] Figure 1 It is the whole structure schematic diagram of the utility model;

[0038] Figure 2 It is the shell section structure schematic diagram in the utility model;

[0039] Figure 3 It is the replacement mechanism structure schematic diagram in the utility model;

[0040] Figure 4 It is the replacement mechanism local structure schematic diagram in the utility model;

[0041] Figure 5 It is the limiting sealing mechanism structure schematic diagram in the utility model.

[0042] In the figure: 100, screening mechanism; 110, shell; 111, square hole one; 112, square hole two; 113, chute; 200, tremor mechanism; 210, square plate; 211, U-shaped frame one; 212, square rod one; 213, limiting rod one; 214, square block; 216, square rod three; 217, limiting rod two; 218, spring; 220, inclined plate; 230, No. 1 motor; 231, round rod; 232, arc-shaped frame; 300, replacement mechanism; 310, U-shaped frame two; 311, No. 2 motor; 312, threaded rod; 313, U-shaped frame three; 320, L-shaped frame; 330, fixed frame; 331, frame; 332, toothed plate; 333, square hole three; 340, spring telescopic rod one; 341, spur gear; 342, No. 3 motor; 400, limiting sealing mechanism; 410, partition plate; 411, square rod four; 420, spring telescopic rod two. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0044] Please refer to Figures 1-5As shown, the urea particle screening device comprises a screening mechanism 100, the screening mechanism 100 comprises a shell 110 and the following parts: two square holes one 111 are evenly arranged on the outer walls of the two sides of the shell 110, and a group of square holes two 112 are arranged on the inner walls of the two sides of the shell 110 near the top position, and a chute 113 is arranged on the inner walls of the two sides of the shell 110 below the square holes two 112, a tremor mechanism 200 is fixed in the shell 110, which can screen the urea particles, and a replacement mechanism 300 is fixed on the top of the shell 110, which can replace the screen frame, and two limiting and sealing mechanisms 400 are arranged on the inner walls of the two sides of the shell 110, which can seal the position of the square hole one 111 of the shell 110, the tremor mechanism 200 comprises the following parts: two square plates 210 are arranged on the inner walls of the two ends of the shell 110, and a group of U-shaped frames one 211 are arranged on the inner wall of the shell 110 and are slidably connected, a square rod one 212 is fixedly connected to one end of the U-shaped frame one 211, two limiting rods one 213 are fixed between the two square rods one 212 and the two U-shaped frames one 211, and the limiting rod one 213 is slidably connected with the screen frame, two square rods three 216 are fixed on the limiting rod one 213 at equal intervals, a limiting rod two 217 is fixedly connected between the outer walls of the two square rods three 216, and the limiting rod two 217 is slidably connected with the screen frame, a block 214 is fixed on the two ends of the U-shaped frame one 211, a spring 218 is fixedly connected between the outer wall of the block 214 and the outer wall of the square plate 210, a first motor 230 is fixed on the outer wall of the shell 110, a round rod 231 is fixedly connected to the rotating shaft of the first motor 230, and two arc-shaped frames 232 are fixedly connected to the outer wall of the round rod 231 at equal intervals, the first motor 230 drives the round rod 231 to rotate, drives the arc-shaped frame 232 to contact with the outer wall of the U-shaped frame one 211, the U-shaped frame one 211 is extruded to make the screen frame clamped between the two limiting rods one 213 and the two limiting rods two 217 move upward, when the arc-shaped frame 232 is separated from the U-shaped frame one 211, the spring 218 rebounds to make the screen frame quickly descend, and the U-shaped frame one 211 hits the square plate 210 to produce tremor and screen the urea particles.

[0045] The replacing mechanism 300 comprises the following parts: the U-shaped frame two 310 is fixed to the outer wall of the shell 110, the No. 2 motor 311 is fixedly connected to the outer wall of the U-shaped frame two 310, and the threaded rod 312 is fixedly connected to the rotating shaft of the No. 2 motor 311, the U-shaped frame three 313 is screwed on the outer wall of the threaded rod 312 and slides with the inner wall of the U-shaped frame two 310, the L-shaped frame 320 is provided with two groups and is fixed to the outer walls of the two sides of the U-shaped frame three 313, the fixed frame 330 is provided with two and is fixed to the two ends of the U-shaped frame three 313, the frame 331 is fixedly connected to the outer wall of the fixed frame 330, the toothed plate 332 is provided with two and is fixed to the outer wall of the No. 2 motor 311 at the center, the square hole three 333 is arranged on the frame 331 at the middle of the two toothed plates 332, the spring telescopic rod one 340 slides between the two toothed plates 332, the No. 3 motor 342 is arranged on the outer wall of one side of the toothed plate 332, the rotating shaft of the No. 3 motor 342 is rotatably connected to the bottom of the spring telescopic rod one 340, two straight gears 341 are fixedly connected to the rotating shaft of the No. 3 motor 342 at equal intervals, and the straight gears 341 are in meshing transmission with the toothed plate 332. Through the replacing mechanism 300, personnel can conveniently replace the screen frame at any position of the shell 110, without disassembling other components, so that the screen frame can be quickly replaced, and the working efficiency and operation convenience are improved.

[0046] The limiting and sealing mechanism 400 comprises the following parts: the partition plate 410 is provided with two and is slidably inserted into the inner wall of the sliding groove 113, the square rod four 411 is fixedly connected between the outer walls of the two ends of the partition plate 410, and the spring telescopic rod two 420 is fixed between the outer wall of the partition plate 410 and the inner wall of the sliding groove 113. The No. 2 motor 311 drives the threaded rod 312 to rotate and screw with the U-shaped frame three 313, drives the frames 331 on the two sides to move to the square hole one 111 position corresponding to the screen frame to be replaced, during which the L-shaped frame 320 is separated from the top partition plate 410, the partition plate 410 is released from the limitation, and is moved upward to the inclined angle position at the bottom of the partition plate 410 at the square hole one 111 position by the rebound of the spring telescopic rod two 420. After the replacement is completed, the No. 2 motor 311 drives the U-shaped frame three 313 to move to tightly abut the outer wall of the shell 110, so that one end of the L-shaped frame 320 extrudes the spring telescopic rod two 420 at the top, the partition plate 410 slides along the track of the sliding groove 113 under the extrusion, so that the inclined angle at the bottom of the partition plate 410 is staggered with the port of the square hole one 111, and the limitation is performed.

[0047] Specifically, in operation, urea particles enter the inside of the shell 110 through the feed inlet at the top of the shell 110 and fall on the screen frame at the top. The first motor 230 drives the rotation of the round rod 231, which drives the arc-shaped frame 232 to contact the outer wall of the U-shaped frame one 211. The U-shaped frame one 211 is pressed to move the screen frame, which is clamped between the two limiting rods one 213 and the two limiting rods two 217, upward. When the arc-shaped frame 232 is separated from the U-shaped frame one 211, the screen frame is quickly lowered by the rebound of the spring 218, and the U-shaped frame one 211 hits the square plate 210 to generate vibration for screening the urea particles. When it is necessary to replace the screen frame inside the shell 110, the second motor 311 drives the rotation of the threaded rod 312 to screw with the U-shaped frame three 313, which drives the two side frames 331 to move to the position of the square hole one 111 corresponding to the screen frame to be replaced. During this period, the L-shaped frame 320 is separated from the top partition 410, and the partition 410 is released from the limiting position and moves upward to the inclined angle position at the bottom of the partition 410 to be located at the square hole one 111. The personnel inserts the screen frame to be replaced into the frame 331. When the screen frame contacts the inclined angle at one end of the spring telescopic rod one 340, the spring telescopic rod one 340 is retracted. When the screen frame is completely placed on the frame 331 and separated from one end of the spring telescopic rod one 340, the spring telescopic rod one 340 limits the screen frame by rebound. The third motor 342 drives the rotation of the straight gear 341 to mesh with the toothed plate 332, which drives the spring telescopic rod one 340 to move and push the screen frame on the frame 331 into the shell 110 along the corresponding square hole one 111. When the outer wall of the screen frame on one side contacts the partition 410 in the square hole one 111, it is pressed to move the corresponding partition 410 upward. The screen frame to be replaced presses the screen frame to be replaced to move to the corresponding square hole one 111 on the other side of the shell 110 and is pressed out of the shell 110, and slides to the other frame 331. The new screen frame is inserted into the limiting rod one 213 or the limiting rod two 217. After the replacement is completed, the second motor 311 drives the U-shaped frame three 313 to move close to the outer wall of the shell 110, so that one end of the L-shaped frame 320 presses the top spring telescopic rod two 420. The partition 410 is pressed to slide along the track of the sliding groove 113, so that the inclined angle at the bottom of the partition 410 is offset from the port of the square hole one 111 to be limited. Embodiment one

[0048] As Figure 2As shown, in the embodiment, the vibrating mechanism 200 comprises the following parts: the square plates 210 are provided with two, respectively fixed with the inner walls of the shell 110 at the bottom, and the U-shaped frame one 211 is provided with a group, and the inner wall of the shell 110 is slidingly inserted, and the square rod one 212 is fixedly connected at one end of the U-shaped frame one 211, the limiting rod one 213 is provided with two, respectively fixed between the two square rod one 212 and the one end of the two U-shaped frame one 211, and the limiting rod one 213 is slidingly inserted with the screen frame, the square rod three 216 is provided with two, fixed on the limiting rod one 213 at equal intervals, the limiting rod two 217 is fixedly connected between the outer walls of the two square rod three 216, and the limiting rod two 217 is slidingly inserted with the screen frame, the square block 214 is fixed at both ends of the U-shaped frame one 211, the spring 218 is fixedly connected between the outer wall of the square block 214 and the outer wall of the square plate 210, the No. 230 is fixed with the outer wall of the shell 110, the round rod 231 is fixedly connected with the rotating shaft of the No. 230, and the two arc-shaped frames 232 are fixedly connected with the outer wall of the round rod 231 at equal intervals.

[0049] In the embodiment, the No. 230 drives the round rod 231 to rotate, drives the arc-shaped frame 232 to contact with the outer wall of the U-shaped frame one 211, the U-shaped frame one 211 is extruded to make the screen frame clamped between the two limiting rod one 213 and the two limiting rod two 217 move upward, when the arc-shaped frame 232 is separated from the U-shaped frame one 211, the spring 218 is rebounded to make the screen frame quickly descend, and the U-shaped frame one 211 is impacted on the square plate 210 to produce vibration, and the urea particles are screened, by driving the No. 230, a plurality of screen frames can be driven to vibrate to screen the urea particles, and the mechanical linkage is effectively improved, in addition, the screen frame is limited by the limiting rod one 213 or the limiting rod two 217, when the screen frame needs to be replaced, the replacement mechanism 300 can be conveniently operated and replaced.

[0050] As Figures 3-4As shown, in the embodiment, the replacement mechanism 300 comprises the following parts: the U-shaped frame two 310 is fixed to the outer wall of the shell 110, the No. 2 motor 311 is fixedly connected to the outer wall of the U-shaped frame two 310, and the threaded rod 312 is fixedly connected to the rotating shaft of the No. 2 motor 311, the U-shaped frame three 313 is screwed onto the outer wall of the threaded rod 312 and slides with the inner wall of the U-shaped frame two 310, the L-shaped frame 320 is provided with two groups, which are respectively fixed to the outer walls of the two sides of the U-shaped frame three 313, the fixed frame 330 is provided with two, which are respectively fixed to the two ends of the U-shaped frame three 313, the frame 331 is fixedly connected to the outer wall of the fixed frame 330, the tooth plate 332 is provided with two, which are fixed to the outer wall of one of the No. 2 motors 311 at the center, the square hole three 333 is opened on one of the frames 331 between the two tooth plates 332, the spring telescopic rod one 340 slides between the two tooth plates 332, one end of the spring telescopic rod one 340 is provided with an inclined angle, the No. 3 motor 342 slides on the outer wall of one side of the tooth plate 332, the rotating shaft of the No. 3 motor 342 is rotatably connected to the bottom of the spring telescopic rod one 340, and two straight gears 341 are fixedly connected to the rotating shaft of the No. 3 motor 342 at equal intervals, and the straight gears 341 are meshed with the tooth plate 332.

[0051] In specific implementation, personnel insert the screen frame to be replaced into the frame 331, when the screen frame contacts with the inclined angle of one end of the spring telescopic rod one 340, the spring telescopic rod one 340 will contract, when the screen frame is completely placed on the frame 331 and separated from one end of the spring telescopic rod one 340, the spring telescopic rod one 340 is limited by the rebound of the screen frame, the No. 3 motor 342 drives the straight gear 341 to rotate and mesh with the tooth plate 332, drives the spring telescopic rod one 340 to move, pushes the screen frame on the frame 331 along the corresponding square hole one 111 into the shell 110, when the outer wall of one side of the screen frame contacts with the baffle 410 in the square hole one 111, it is extruded to make the corresponding spring telescopic rod two 420 move upward, the screen frame to be replaced extrudes the screen frame to be replaced to move to the corresponding square hole one 111 on the other side of the shell 110, and is extruded out of the shell 110, slides to the other frame 331, and the new screen frame slides and inserts with the limiting rod one 213 or the limiting rod two 217, through the replacement mechanism 300, personnel can conveniently replace the screen frame at any position of the shell 110, without disassembling other parts, the quick replacement can be completed, the work efficiency and the operation convenience are effectively improved. Embodiment two

[0052] As Figure 5As shown, in this embodiment, the limiting sealing mechanism 400 includes the following parts: two partitions 410 are provided, which are slidably plugged into the inside of the slide groove 113, and a square rod four 411 is fixedly connected between the outer walls at both ends of the two partitions 410, and a spring telescopic rod two 420 is fixed between the outer wall of the partition 410 and the inner wall of the slide groove 113.

[0053] During the specific implementation, the second motor 311 drives the threaded rod 312 to rotate and screw it with the U-shaped frame 313, driving the frames 331 on both sides to move to the position of the square hole 111 corresponding to the screen frame that needs to be replaced. During this period, the L-shaped frame 320 will be separated from the top partition 410, the partition 410 will be released from the limit, and the spring telescopic rod 2 420 will rebound and move upward to the oblique angle position at the bottom of the partition 410 at the square hole 111. After the replacement is completed, the second motor 311 drives the U-shaped frame 313 to move close to the outer wall of the shell 110, so that one end of the L-shaped frame 320 squeezes the spring at the top The telescopic rod 420 and the partition 410 are squeezed and slide along the track of the slide groove 113, so that the bevel angle of the bottom of the partition 410 is staggered with the port of the square hole 111 for limiting the position. The limiting sealing mechanism 400 can seal the square hole 111 on both sides of the shell 110, and at the same time, it can seal the screen frame inside the shell 110 to prevent the screen frame from shaking during vibration, causing one end to be stuck in the square hole 111 and causing damage to the components. In addition, when the replacement is completed, the partition 410 moves downward along the slide groove 113, and can also separate the two screen frames that are tightly attached to each other, effectively improving the working stability.

[0054] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the scope of the present invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

Claims

1. Urea granule screening equipment, characterized in that, include: The screening mechanism (100) comprises a housing (110), wherein two square holes (111) are formed on both sides of the outer wall of the housing (110) at equal intervals, a group of square holes (112) are formed on both sides of the inner wall of the housing (110) near the top, and a chute (113) is formed on both sides of the inner wall of the housing (110) below the square holes (112); A vibrating mechanism (200) is fixed inside the housing (110) and is capable of screening urea particles; A replacement mechanism (300) is fixed to the top of the housing (110) and is capable of replacing the screen frame; Two position-limiting sealing mechanisms (400) are provided and are fixed inside both sides of the shell (110) respectively, and can seal the position of the square hole 1 (111) of the shell (110).

2. The urea granule screening device according to claim 1, characterized in that: The vibration mechanism (200) comprises: Two square plates (210) are provided and are fixed to the inner walls at both ends of the shell (110) at the bottom respectively; A U-shaped frame (211) is provided, which is slidably plugged into the inner wall of the shell (110), and one end of the U-shaped frame (211) is fixedly connected to a square rod (212); There are two limiting rods (213), which are respectively fixed between the two square rods (212) and between one end of the two U-shaped frames (211), and the limiting rods (213) are slidably connected with the screen frame; There are two square rods (216) fixed on the limiting rod (213) at equal intervals, and the limiting rod (217) is fixedly connected between the outer walls of one end of the two square rods (216), and the limiting rod (217) is slidably connected to the screen frame; The block (214) is fixed at both ends of the U-shaped frame (211), and a spring (218) is fixedly connected between the outer wall of the block (214) and the outer wall of the square plate (210).

3. The urea granule screening device according to claim 2, characterized in that: The vibration mechanism (200) comprises: The first motor (230) is fixed to the outer wall of the housing (110), the rotating shaft of the first motor (230) is fixedly connected to a round rod (231), and the outer wall of the round rod (231) is fixedly connected to two arc-shaped frames (232) at equal intervals.

4. The urea granule screening device according to claim 3, characterized in that: The replacement mechanism (300) comprises: A second U-shaped frame (310) is fixed to the outer wall of the housing (110), a second motor (311) is fixedly connected to the outer wall of the second U-shaped frame (310), and a rotating shaft of the second motor (311) is fixedly connected to a threaded rod (312); The U-shaped frame 3 (313) is screwed onto the outer wall of the threaded rod (312) and slides with the inner wall of the U-shaped frame 2 (310).

5. The urea granule screening device according to claim 4, characterized in that: The replacement mechanism (300) comprises: Two groups of L-shaped frames (320) are provided and are respectively fixed to the outer walls on both sides of the U-shaped frame (313).

6. The urea granule screening device according to claim 5, characterized in that: The replacement mechanism (300) comprises: Two fixing frames (330) are provided and fixed at both ends of the U-shaped frame (313), respectively. The outer wall of the fixing frame (330) is fixedly connected to the frame (331); Two tooth plates (332) are provided and fixed to the center of the outer wall of one of the second motors (311); A third square hole (333) is provided on one of the frames (331) and is located between the two tooth plates (332); A spring telescopic rod (340) slides between the two tooth plates (332), and one end of the spring telescopic rod (340) is provided with an oblique angle; The third motor (342) slides on the outer wall of one side of the tooth plate (332), and the rotating shaft of the third motor (342) is rotatably connected to the bottom of the spring telescopic rod (340). The rotating shaft of the third motor (342) is fixedly connected to two spur gears (341) at equal intervals, and the spur gears (341) are meshed with the tooth plate (332) for transmission.

7. The urea granule screening device according to claim 6, characterized in that: The position limiting sealing mechanism (400) comprises: Two partitions (410) are provided, which are slidably plugged into the interior of the chute (113), and a square rod (411) is fixedly connected between the outer walls at both ends of the two partitions (410); The second spring telescopic rod (420) is fixed between the outer wall of the partition (410) and the inner wall of the slide groove (113).

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