An aqueous polyurethane attapulgite coated slow-release fertilizer preparation device

Abstract

The application belongs to the technical field of preparation of film-coated slow-release fertilizer, and discloses a water-based polyurethane attapulgite film-coated slow-release fertilizer preparation device, which comprises a base, the top end of the base is fixed with a supporting wheel, the top end of a storage cylinder is fixedly connected with a conveying pump, the output end of the conveying pump is fixed with a conveying pipe, one end of the conveying pipe is provided with an adjusting mechanism, and the outside of the base is provided with a discharging mechanism; the device can adjust the spraying angle and coverage according to the accumulation height of the fertilizer particles in the rotating drum through the cooperation of the conveying head, the protective shell, the first spraying frame and other structures, the problem that the uneven film coating caused by the fixed spraying head failing to adapt to different material surface heights is solved, the electric motor drives the first gear to rotate to drive the first spraying frame to rotate and adjust the spraying direction, meanwhile, the first gear drives the second spraying frame to slide along the guide groove to expand and enlarge the spraying coverage, so that the slurry can uniformly cover the fertilizer particles at different positions in the film coating cylinder, and finally the effect of uniform and consistent film coating is achieved.

Description

Technical Field

[0001] This invention belongs to the field of coating slow-release fertilizer preparation technology, specifically a device for preparing water-based polyurethane attapulgite coated slow-release fertilizer. Background Technology

[0002] Coated slow-release fertilizer is a fertilizer product that releases nutrients slowly at a set rate by coating the surface of fertilizer granules with a layer of polymer film material. Waterborne polyurethane attapulgite coated slow-release fertilizer is a composite coating system with waterborne polyurethane emulsion as the film-forming body and attapulgite fibrous clay as the filling and reinforcing phase. During preparation, a slurry containing attapulgite is evenly sprayed onto the surface of fertilizer granules tumbling inside a drum. After drying and curing, a dense composite film layer is formed on the surface of the granules. Existing coated slow-release fertilizer preparation equipment usually includes a drum, a storage tank, a delivery pump, and a nozzle. The slurry in the storage tank is sent into the drum by the delivery pump, and the nozzle sprays the slurry onto the surface of the tumbling fertilizer granules to complete the coating operation.

[0003] Publication No. CN117602989A discloses a low-energy-consumption continuous coated controlled-release fertilizer automated production device and coating method, including a rotary drum, a solid raw material pretreatment mechanism, a spraying mechanism, and a liquid raw material storage mechanism; an infrared dynamic detection probe is installed inside the rotary drum; the spraying mechanism includes a slide rail and a sliding block, with a nozzle mounted on the sliding block, and the nozzle is conveyed by a pressure pump located in a storage tank; the infrared dynamic detection probe, the pressure pump, and the drive motor of the rotary drum are all connected to a controller circuit. This device lifts, screens, preheats, meters, coats, and discharges fertilizer granules, achieving a low-energy-consumption, automated, and continuous production process; the coated product can achieve multi-layer composite coating and cross-linked interpenetrating coating, with high membrane uniformity, less waste in the production process, and a controlled-release period of 1 to 12 months, with precise release timing, enabling precise controlled release of nutrients.

[0004] This device enables continuous coating operations and monitors the coating progress using a detection probe. However, the spray nozzle of the spraying mechanism is fixedly mounted on the sliding block, and the spraying angle and coverage of the nozzle cannot be adjusted according to the amount of fertilizer particles accumulated in the drum. When the feed rate changes, the distribution height of the particles in the drum varies, and the fixed nozzle cannot adapt to different material surface heights, resulting in inconsistent spraying distance and uneven coating of some particles. At the same time, fertilizer particles are prone to accumulate and block the discharge port when the device discharges, affecting continuous discharge. Therefore, a water-based polyurethane attapulgite coated slow-release fertilizer preparation device is proposed, which can adjust the spraying angle and coverage according to the distribution state of fertilizer particles in the drum and achieve vibration-based anti-blocking discharge. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a waterborne polyurethane attapulgite coated slow-release fertilizer preparation device, comprising a base, a support wheel fixed to the top of the base, a coating cylinder installed at the top of the support wheel, a storage cylinder provided outside the base, a conveying pump fixedly connected to the top of the storage cylinder, a conveying pipe fixedly connected to the output end of the conveying pump, an adjusting mechanism installed at one end of the conveying pipe, and a unloading mechanism provided outside the base; The adjustment mechanism includes a conveying head, a protective shell, and a first spray frame. The conveying head is fixed to the bottom end of the conveying pipe, the protective shell is fixed to the outside of the conveying head, and the first spray frame is rotatably connected to the inside of the conveying head. The unloading mechanism includes a support frame, an unloading plate, and a first motor. The support frame is located outside the base, the unloading plate is fixed to the top of the support frame, and the first motor is fixed to one end of the unloading plate.

[0007] Preferably, a second spray frame is rotatably connected inside the conveyor head, an electric motor is fixed to one end of the conveyor head, and a first gear is fixed to the drive end of the electric motor.

[0008] Preferably, the conveying heads are arranged in several groups, and the conveying heads are distributed in an array, and the protective shell is a hollow hemispherical shape.

[0009] Preferably, one end of the protective shell is provided with a guide groove, the first spray frame is slidably connected to the guide groove, and the second spray frame is slidably connected to the guide groove.

[0010] Preferably, the first spray frame has several sets of atomizing nozzles fixed to its exterior, and the atomizing nozzles are arranged in an array. The second spray frame also has several sets of atomizing nozzles fixed to its exterior, and the atomizing nozzles are arranged in an array.

[0011] Preferably, one end of the first spray frame is fixed with several sets of teeth, the first gear and the first spray frame are meshed and connected, and one end of the second spray frame is provided with several sets of teeth, the first gear and the second spray frame are meshed and connected.

[0012] Preferably, a drive disk is fixed to the drive end of the first motor, and a vibration groove is opened at one end of the drive disk. A return spring is fixed inside the unloading plate, and a ball is fixed at one end of the return spring. The drive disk is driven to rotate by the first motor, and the return spring continuously squeezes the ball to roll along the vibration groove to generate continuous vibration. Vibration anti-clogging of the unloading plate can be achieved without additional vibration equipment. The structure is compact and the vibration frequency is synchronously adjustable with the speed of the drive disk.

[0013] Preferably, the top of the unloading plate is unfolded, and the bottom of the unloading plate is inclined.

[0014] Preferably, the vibration grooves are provided in several groups and are arranged in a circular array, and the return spring is used to squeeze the ball bearings.

[0015] Preferably, a second motor is fixed to the top of the base, a reduction gearbox is fixed to the drive end of the second motor, a second gear is fixed to the output end of the reduction gearbox, and a third gear is fixed to the outside of the coating cylinder, with the second gear and the third gear meshing together.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordinated arrangement of a conveyor head, protective shell, and first spray frame, enables the device to adjust the spraying angle and coverage area according to the accumulation height of fertilizer particles inside the drum. This solves the problem of uneven coating caused by the fixed spray head being unable to adapt to different material surface heights. The electric motor drives the first gear to rotate, causing the first and second spray frames to unfold in opposite directions along the guide groove, expanding the spraying coverage area and enabling the slurry to evenly cover fertilizer particles at different positions inside the coating cylinder, ultimately achieving a uniform coating effect.

[0017] This invention, through the coordinated arrangement of a support frame, a discharge plate, and a first motor, enables the device to continuously vibrate the discharge plate during discharge, solving the problem of fertilizer granules accumulating and clogging at the discharge port, thus affecting continuous discharge. The first motor drives the drive disc to rotate, and the balls roll along the vibration groove on the surface of the drive disc under the compression of the return spring. The balls continuously enter and leave the vibration groove, causing the discharge plate to vibrate, which disperses the fertilizer granules accumulated on the discharge plate and allows them to be discharged smoothly, ultimately achieving the effect of preventing discharge blockage and ensuring continuous discharge. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall right-side structure of the present invention; Figure 3 This is a schematic diagram of the conveying pipe structure of the present invention; Figure 4 This is a schematic diagram of the adjustment mechanism structure of the present invention; Figure 5 This is a schematic diagram of the internal cross-sectional structure of the adjustment mechanism of the present invention; Figure 6 For the present invention Figure 5 Enlarged cross-sectional view of a portion of point A in the middle section; Figure 7 This is an enlarged structural diagram of the unloading mechanism of the present invention; Figure 8 This is a schematic diagram of the unloading mechanism of the present invention.

[0019] In the diagram: 1. Base; 2. Support wheel; 3. Coating cylinder; 4. Storage cylinder; 5. Conveying pump; 6. Conveying pipe; 7. Adjusting mechanism; 701. Conveying head; 702. Protective shell; 703. First spray frame; 704. Second spray frame; 705. Electric motor; 706. First gear; 8. Unloading mechanism; 801. Support frame; 802. Unloading plate; 803. First motor; 804. Drive disc; 805. Vibration groove; 806. Return spring; 807. Ball bearing; 9. Second motor; 10. Gearbox; 11. Second gear; 12. Third gear. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 8 As shown, the present invention provides a device for preparing waterborne polyurethane attapulgite coated slow-release fertilizer, including a base 1, a support wheel 2 fixed to the top of the base 1, a coating cylinder 3 installed on the top of the support wheel 2, a storage cylinder 4 provided outside the base 1, a conveying pump 5 fixedly connected to the top of the storage cylinder 4, a conveying pipe 6 fixedly connected to the output end of the conveying pump 5, an adjusting mechanism 7 installed at one end of the conveying pipe 6, a unloading mechanism 8 provided outside the base 1, a second motor 9 fixed to the top of the base 1, a reduction gearbox 10 fixed to the drive end of the second motor 9, a second gear 11 fixed to the output end of the reduction gearbox 10, and a third gear 12 fixed to the outside of the coating cylinder 3, with the second gear 11 and the third gear 12 meshing together.

[0022] The above scheme is adopted: by starting the second motor 9 to drive the reduction gearbox 10 to rotate, the reduction gearbox 10 drives the second gear 11 to rotate, and the second gear 11 drives the third gear 12 and the coating cylinder 3 to rotate, thereby causing the material inside the coating cylinder 3 to rotate. Then, by starting the conveying pump 5, the liquid material inside the storage cylinder 4 is sprayed through the conveying pipe 6 and the adjusting mechanism 7.

[0023] like Figures 1 to 6As shown, the adjusting mechanism 7 includes a conveying head 701, a protective shell 702, and a first spray frame 703. The conveying head 701 is fixed to the bottom end of the conveying pipe 6, the protective shell 702 is fixed to the outside of the conveying head 701, the first spray frame 703 is rotatably connected to the inside of the conveying head 701, and a second spray frame 704 is rotatably connected to the inside of the conveying head 701. An electric motor 705 is fixed to one end of the conveying head 701, and a first gear 706 is fixed to the drive end of the electric motor 705. Several sets of conveying heads 701 are arranged in an array, and the protective shell 702 is a hollow hemisphere. The protective shell 702 has a guide groove at one end. The first spray frame 703 is slidably connected to the guide groove, and the second spray frame 704 is slidably connected to the guide groove. Several sets of atomizing nozzles are fixed on the outside of the first spray frame 703, and the atomizing nozzles are arranged in an array. Several sets of atomizing nozzles are fixed on the outside of the second spray frame 704, and the atomizing nozzles are arranged in an array. Several sets of teeth are fixed on one end of the first spray frame 703, and the first gear 706 is meshed with the first spray frame 703. Several sets of teeth are provided on one end of the second spray frame 704, and the first gear 706 and the second spray frame 704 are meshed with each other.

[0024] The above scheme is adopted as follows: after the liquid material is transported to the inside of the conveying head 701 through the conveying pipe 6, it is transported into the first spray frame 703 and the second spray frame 704 through the conveying head 701, and then sprayed through the atomizing nozzles on the outside of the first spray frame 703 and the second spray frame 704. The first gear 706 is rotated by starting the electric motor 705, so that the first gear 706 meshes with the teeth on the outside of the first spray frame 703 and the second spray frame 704 when it rotates, thereby driving the first spray frame 703 and the second spray frame 704 to rotate in opposite directions.

[0025] like Figures 1 to 8 As shown, the unloading mechanism 8 includes a support frame 801, an unloading plate 802, and a first motor 803. The support frame 801 is disposed outside the base 1. The unloading plate 802 is fixed to the top of the support frame 801. The first motor 803 is fixed to one end of the unloading plate 802. A drive disk 804 is fixed to the drive end of the first motor 803. A vibration groove 805 is provided at one end of the drive disk 804. A return spring 806 is fixed inside the unloading plate 802. A ball bearing 807 is fixed to one end of the return spring 806. The top of the unloading plate 802 is unfolded, and the bottom of the unloading plate 802 is inclined. Several sets of vibration grooves 805 are provided and distributed in a circular array. The return spring 806 is used to squeeze the ball bearing 807.

[0026] The above scheme is adopted as follows: After the material inside the coating cylinder 3 is coated, the material can be driven to the top by the coating cylinder 3. When the material reaches the top, it falls into the unloading plate 802 and is unloaded. By starting the first motor 803, the drive disk 804 is driven to rotate. When the drive disk 804 rotates, the return spring 806 always squeezes the ball bearings 807 into the vibration groove 805 in sequence to generate vibration and maintain vibration. The vibration is transmitted to the unloading plate 802, so that the material falling into the top of the unloading plate 802 is improved by vibration and the unloading efficiency is improved. One end of the conveying pipe 6 is fixedly connected to the unloading plate 802. The vibration of the unloading plate 802 is also transmitted to the conveying pipe 6, so that the sprayed liquid can also be improved by vibration and the spraying range can be improved and blockage is avoided.

[0027] The working principle and usage process of this invention are as follows: When in use, the fertilizer granules to be coated are fed into the coating cylinder 3 from the feed end of the coating cylinder 3. At the same time, a mixed slurry of water-based polyurethane and attapulgite is prepared in the storage cylinder 4. After the preparation work is completed, the coating operation stage begins.

[0028] During the slurry preparation process, attapulgite fibrous clay and water-based polyurethane emulsion are mixed and stirred inside the storage cylinder 4. The density of attapulgite fibers is greater than that of polyurethane emulsion. When stirring stops or the speed is insufficient, attapulgite tends to settle and agglomerate at the bottom of the storage cylinder 4, resulting in a decrease in the attapulgite content in the upper layer of slurry and a higher concentration in the lower layer of slurry. The proportion of attapulgite in the slurry pumped by the delivery pump 5 at different times is inconsistent, which causes differences in the amount of attapulgite filling in the coating layer on the surface of different batches of fertilizer granules, affecting the consistency of the coating layer performance. Therefore, the stirring inside the storage cylinder 4 needs to continue until the delivery pump 5 completes the delivery of all slurry to ensure that the slurry entering the delivery pipe 6 is always in a uniformly dispersed state.

[0029] During the coating operation, the second motor 9 is started. The drive end of the second motor 9 drives the reduction gearbox 10 to operate. The reduction gearbox 10 reduces the speed and outputs to the second gear 11. The second gear 11 meshes with the third gear 12 on the outside of the coating cylinder 3, causing the coating cylinder 3 to rotate on the support wheel 2. The fertilizer granules inside the coating cylinder 3 are continuously tumbled and lifted as the coating cylinder 3 rotates, and then fall back to the bottom of the coating cylinder 3 under the action of gravity, forming a continuous tumbling state. At the same time, the conveying pump 5 is started, and the conveying pump 5 pumps the storage cylinder... The slurry inside 4 is transported through the conveying pipe 6 to the conveying head 701 of the regulating mechanism 7. After entering the conveying head 701, the slurry flows into the first spray frame 703 and the second spray frame 704 respectively. The slurry is atomized and sprayed out by the atomizing nozzles distributed in the array outside the first spray frame 703 and the second spray frame 704. The atomized slurry adheres to the surface of the tumbling fertilizer particles. As the coating cylinder 3 continues to rotate, the fertilizer particles tumble continuously, causing the slurry to spread evenly on the particle surface. After drying and curing, a coating layer is formed on the particle surface.

[0030] During the spraying process, the electric motor 705 is started. The drive end of the electric motor 705 drives the first gear 706 to rotate. The first gear 706 meshes with the teeth at one end of the first spray frame 703 and simultaneously with the teeth at one end of the second spray frame 704. When the first gear 706 rotates, it drives the first spray frame 703 and the second spray frame 704 to rotate in opposite directions along the guide groove on the protective shell 702. When the first spray frame 703 and the second spray frame 704 expand in opposite directions, the spraying coverage of the atomizing nozzle is expanded. When they retract in opposite directions, the spraying coverage is reduced and the spraying distance is concentrated. When the feed volume inside the coating cylinder 3 is large and the fertilizer particles are piled up high, the first spray frame 703 and the second spray frame 704 can be used to spray the fertilizer particles. The opposing spraying frames 704 expand the spraying range to accommodate the particle distribution range. When the feed rate is small and the particle accumulation is low, the first spray frame 703 and the second spray frame 704 converge to concentrate the slurry onto the area where the particles are concentrated. The protective shell 702 is a hollow hemispherical shape, which protects the first spray frame 703 and the second spray frame 704 inside the conveying head 701, preventing the fertilizer particles tumbling inside the coating cylinder 3 from directly impacting the conveying head 701 and the spray frame structure. The conveying head 701 is provided in several groups and is arranged in an array. Each group of conveying heads 701 can independently adjust the spraying angle. Multiple groups of conveying heads 701 work together to cover different areas inside the coating cylinder 3.

[0031] Inside the coating cylinder 3, fertilizer granules are lifted to a certain height by the lifting plates on the inner wall of the coating cylinder 3 and then thrown down. During this process, they come into contact with slurry droplets sprayed from the atomizing nozzle. After the slurry droplets adhere to the surface of the granules, the granules continue to tumble, causing the slurry to spread along the surface of the granules. The rotation speed of the coating cylinder 3 is adjusted by the second motor 9 and the reduction gearbox 10. When the speed is lower, the tumbling frequency of the granules inside the coating cylinder 3 is reduced, and the granules stay in the air for a longer time. This allows the slurry droplets more time to spread on the surface of the granules and to undergo preliminary drying, which is suitable for applications requiring a single layer of fertilizer. In thick film coating processes, higher rotation speeds increase particle tumbling frequency, leading to increased collisions and friction between particles and faster slurry spreading on particle surfaces. This is suitable for coating processes requiring multiple layers of film. By adjusting the rotation speed of the coating cylinder 3 to match the delivery flow rate of the delivery pump 5, the ratio between slurry supply and particle tumbling frequency is controlled, ensuring that each particle is coated with an appropriate amount of slurry during a single tumbling process. This avoids excessive slurry supply causing adhesion and clumping between adjacent particles, or insufficient slurry supply resulting in exposed areas of the coating layer on the particle surface.

[0032] After coating is completed, the unloading stage begins. The coating cylinder 3 rotates continuously, carrying the fertilizer granules inside to the top of the coating cylinder 3. The fertilizer granules at the top fall out of the discharge end of the coating cylinder 3 under gravity and into the unloading plate 802. The top of the unloading plate 802 is open to receive the fertilizer granules falling from the coating cylinder 3. The bottom of the unloading plate 802 is inclined, guiding the fertilizer granules towards the discharge direction. The first motor 803 is started, and its drive end drives the drive disc 804 to rotate. One end of the drive disc 804 has several sets of vibration grooves 805 arranged in a circular array. When the drive disc 804 rotates, the unloading plate... The return spring 806 inside 802 constantly presses the ball 807 against the surface of the drive disc 804. Under the thrust of the return spring 806, the ball 807 enters and exits the vibration groove 805 in sequence. When the ball 807 enters the vibration groove 805, it moves radially inward. When it exits the vibration groove 805, it is ejected outward under the thrust of the return spring 806. The repeated entry and exit of the ball 807 into the vibration groove 805 generates continuous vibration. This vibration is transmitted to the unloading plate 802, causing the unloading plate 802 to vibrate. The fertilizer particles that fall into the unloading plate 802 are dispersed and slide downward under the action of vibration, thus avoiding the accumulation and blockage of fertilizer particles inside the unloading plate 802.

[0033] In addition, one end of the conveying pipe 6 is fixedly connected to the unloading plate 802. The vibration generated by the unloading plate 802 is transmitted to the conveying pipe 6 through the connection. The conveying pipe 6 further transmits the vibration to the conveying head 701 and the spray frame structure, so that the slurry attached to the inner wall of the spraying channel falls off under the action of vibration, avoiding the slurry from solidifying inside the conveying head 701 and the atomizing nozzle and causing blockage.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer, comprising a base (1), characterized in that: The base (1) is fixed with a support wheel (2) at the top, and a coating cylinder (3) is installed at the top of the support wheel (2). A storage cylinder (4) is provided on the outside of the base (1). A conveying pump (5) is fixedly connected to the top of the storage cylinder (4). A conveying pipe (6) is fixed at the output end of the conveying pump (5). An adjustment mechanism (7) is installed at one end of the conveying pipe (6). A discharge mechanism (8) is provided on the outside of the base (1). The adjustment mechanism (7) includes a conveying head (701), a protective shell (702), and a first spray frame (703). The conveying head (701) is fixed to the bottom end of the conveying pipe (6), the protective shell (702) is fixed to the outside of the conveying head (701), and the first spray frame (703) is rotatably connected to the inside of the conveying head (701). The unloading mechanism (8) includes a support frame (801), an unloading plate (802), and a first motor (803). The support frame (801) is located outside the base (1), the unloading plate (802) is fixed to the top of the support frame (801), and the first motor (803) is fixed to one end of the unloading plate (802).

2. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 1, characterized in that: The conveying head (701) is rotatably connected to a second spray frame (704), and an electric motor (705) is fixed to one end of the conveying head (701). A first gear (706) is fixed to the drive end of the electric motor (705).

3. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 1, characterized in that: The conveying head (701) is provided in several groups, and the conveying head (701) is arranged in an array. The protective shell (702) is a hollow hemispherical shape.

4. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 2, characterized in that: The protective shell (702) has a guide groove at one end, the first spray frame (703) is slidably connected to the guide groove, and the second spray frame (704) is slidably connected to the guide groove.

5. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 2, characterized in that: The first spray frame (703) has several sets of atomizing nozzles fixed to its exterior, and the atomizing nozzles are arranged in an array. The second spray frame (704) has several sets of atomizing nozzles fixed to its exterior, and the atomizing nozzles are arranged in an array.

6. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 2, characterized in that: One end of the first spray frame (703) is fixed with several sets of teeth, and the first gear (706) and the first spray frame (703) are meshed together. One end of the second spray frame (704) is provided with several sets of teeth, and the first gear (706) and the second spray frame (704) are meshed together.

7. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 1, characterized in that: The first motor (803) has a drive disk (804) fixed at its drive end. One end of the drive disk (804) has a vibration groove (805). The unloading plate (802) has a reset spring (806) fixed inside. One end of the reset spring (806) has a ball (807) fixed.

8. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 1, characterized in that: The top of the unloading plate (802) is open, and the bottom of the unloading plate (802) is inclined.

9. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 7, characterized in that: The vibration groove (805) is provided in several groups and is arranged in a ring array. The reset spring (806) is used to squeeze the ball (807).

10. The apparatus for preparing waterborne polyurethane attapulgite-coated slow-release fertilizer according to claim 1, characterized in that: The top of the base (1) is fixed with a second motor (9), the drive end of the second motor (9) is fixed with a reduction gearbox (10), the output end of the reduction gearbox (10) is fixed with a second gear (11), the outside of the coating cylinder (3) is fixed with a third gear (12), and the second gear (11) and the third gear (12) are meshed together.

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