A vertical fertilizer coating system

Abstract

The application discloses a vertical fertilizer coating system, which comprises a first coating machine assembly and a switching assembly. The first coating machine assembly comprises a mixing cylinder, a support, a fixed platform, a discharging part and a stirring part. The support is fixed to the bottom of the mixing cylinder, the fixed platform is fixed to the middle of the support, the discharging part is arranged at the bottom of one side of the mixing cylinder, and the stirring part is arranged in the mixing cylinder. The switching assembly is arranged at the bottom of the fixed platform and comprises a closed box, a driving part, a transmission part, an adjusting part and a limiting part. The closed box is fixed to the bottom of the fixed platform. The switching assembly can switch the rotating direction of the stirring plate, so that the fertilizer particles can be thrown up when the fertilizer is stirred, the rolling of the fertilizer particles in the tank is promoted, and the fertilizer particles can be fully mixed with the coating agent. When discharging, the stirring plate can rotate reversely, so that the discharging efficiency of the fertilizer can be improved, and the blockage can be prevented. Meanwhile, the closed door can be fixed when mixing and discharging, so that the accidental movement can be prevented.

Description

Technical Field

[0001] This invention relates to the field of fertilizer coating technology, and in particular to a vertical fertilizer coating system. Background Technology

[0002] Currently, fertilizer coating machines are mainly divided into rotary drum coating machines and bottom spray coating machines. Rotary drum coating machines are mostly horizontal, which can easily lead to material residue sticking to the wall during discharge. Bottom spray coating machines require a strong blower at the bottom, which greatly increases energy consumption compared to rotary drum coating machines. Vertical fertilizer coating systems have smaller mixing dead zones compared to horizontal coating machines, allowing fertilizer granules and coating agents to be fully mixed. However, existing vertical fertilizer coating systems rely solely on the material's own gravity for discharge, resulting in low efficiency and a tendency for blockages near the discharge port. Furthermore, the baffle plate limiting structure at the discharge port is relatively complex, causing some inconvenience for operators. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problems existing in the above and / or existing vertical fertilizer coating systems, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is that the existing vertical fertilizer coating system discharges the material by gravity alone, which is inefficient and prone to blockage near the discharge port. In addition, the baffle plate limiting structure of the discharge port is relatively complex, which causes some inconvenience to the operator.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vertical fertilizer coating system, comprising a coating machine assembly including a mixing cylinder, a support, a fixed platform, a discharge component, and a stirring component, wherein the support is fixed to the bottom of the mixing cylinder, the fixed platform is fixed to the middle of the support, the discharge component is disposed at the bottom of one side of the mixing cylinder, and the stirring component is disposed inside the mixing cylinder; and a switching assembly disposed at the bottom of the fixed platform, including a closed box, a driving component, a transmission component, an adjusting component, and a limiting component, wherein the closed box is fixed to the bottom of the fixed platform, the driving component is disposed inside the closed box, the transmission component is disposed at the bottom of the stirring component and cooperates with the driving component, the adjusting component is disposed on both sides of the transmission component, and the limiting component is disposed on both sides of the closed box.

[0007] As a preferred embodiment of the vertical fertilizer coating system of the present invention, the discharge component includes a discharge track, a sealing door and a buckle, a discharge port is provided at the bottom of one side of the mixing cylinder, the discharge track is fixed to the bottom of the discharge port, the sealing door slides on the discharge track, and the buckle is fixed on the mixing cylinder.

[0008] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the stirring component includes a stirring shaft and stirring blades, the stirring shaft is rotatably connected inside the mixing cylinder, and the stirring blades are fixed to the surface of the stirring shaft.

[0009] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the driving component includes a drive motor and an output shaft. The drive motor is fixed to the bottom of the fixed platform and located below the enclosed box. The output shaft is fixed to the output end of the drive motor, and its top end extends into the enclosed box.

[0010] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the driving component further includes a first gear, a second gear, and a transmission gear. The first gear and the second gear are respectively fixed to the top and bottom of the output shaft, and the transmission gear is disposed on one side of the first gear and meshes with it.

[0011] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the transmission component includes a third gear and a fourth gear, the bottom end of the stirring shaft extends into the enclosed box, the third gear slides on the surface of the stirring shaft and cooperates with the second gear, and the fourth gear is fixed to the top of the third gear and cooperates with the transmission gear.

[0012] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the transmission component further includes protrusions fixed to both sides of the inner wall of the third gear, and a sliding groove that cooperates with the protrusions is provided on the stirring shaft.

[0013] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the adjusting component includes a sliding frame, a connecting rod, a support plate, and a first spring. The sliding frame slides on both sides of the enclosed box. A limiting groove is provided on the third gear to cooperate with it. One end of the connecting rod is fixed to one side of the sliding frame, and the other end is fixed to the bottom of the enclosed door. The support plate is fixed to the top of the fixed platform. The first spring is sleeved on the outside of the connecting rod and located at the bottom of the support plate.

[0014] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the limiting component includes a protruding rod, a movable plate, a hydraulic buffer, a push plate, and a limiting rod. The protruding rod is fixed on both sides of the output shaft and located below the enclosed box. The movable plate slides on the bottom of the enclosed box and is located on both sides of the output shaft. The hydraulic buffer is disposed on one side of the movable plate. The push plate is fixed on the outside of the movable plate. The limiting rod slides on one side of the enclosed box and cooperates with the push plate. The sliding frame has an insertion hole that cooperates with the limiting rod.

[0015] In a preferred embodiment of the vertical fertilizer coating system of the present invention, the limiting component further includes a limiting frame, a limiting block, and a second spring. The limiting frame is fixed to both sides of the enclosed box, the limiting rod slides within the limiting frame, the limiting block is fixed to the limiting rod, and the two ends of the second spring are respectively fixed to the limiting block and the limiting frame.

[0016] The beneficial effects of this invention are as follows: the rotating direction of the stirring plate can be switched by the switching component, so that the fertilizer particles can be thrown up when stirring the fertilizer, promoting the rolling of the fertilizer particles in the tank and fully mixing with the coating agent. The reverse rotation during discharge can improve the fertilizer discharge efficiency and prevent blockage. At the same time, the sealing door can be fixed during mixing and discharge to prevent accidental movement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0018] Figure 1 This is a structural diagram of a vertical fertilizer coating system.

[0019] Figure 2 This is a cross-sectional view of the vertical fertilizer coating system.

[0020] Figure 3 This is a structural diagram of the switching components for a vertical fertilizer coating system.

[0021] Figure 4 This is a structural diagram of the adjusting components of a vertical fertilizer coating system.

[0022] Figure 5 This is a structural diagram of the limiting component for a vertical fertilizer coating system.

[0023] Figure 6 Another perspective view of the limiting component of the vertical fertilizer coating system. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1

[0028] Reference Figure 1 and Figure 2 This is the first embodiment of the present invention. This embodiment provides a vertical fertilizer coating system, including a coating machine assembly 100 and a switching assembly 200. The coating machine assembly 100 is capable of coating fertilizer and is a vertical coating machine in the prior art. The switching assembly 200 can switch the rotation direction of its internal stirring plate and can control its discharge.

[0029] Specifically, the coating machine assembly 100 includes a mixing cylinder 101, a support 102, a fixed platform 103, a discharge component 104, and a stirring component 105. The support 102 is fixed to the bottom of the mixing cylinder 101, the fixed platform 103 is fixed to the middle of the support 102, the discharge component 104 is located at the bottom of one side of the mixing cylinder 101, and the stirring component 105 is located inside the mixing cylinder 101.

[0030] The mixing cylinder 101 is funnel-shaped, and an electric heating wire can be placed in the cavity between its outer and inner tanks to heat the inner tank and improve the coating efficiency. A temperature measuring device is added inside the mixing cylinder 101, and the temperature of the heating wire can be set to be adjustable, with an adjustment range of 80-100℃, to meet the mixing efficiency of fertilizer under various conditions. This part is not shown in the figure, but those skilled in the art can set it as needed. The support 102 and the fixed platform 103 support the entire device to make its operation more stable. The discharge part 104 is used to discharge the coated fertilizer from the mixing cylinder 101. The stirring part 105 can stir the material in the mixing cylinder 101 to improve its mixing efficiency and uniformity.

[0031] The switching component 200 is located at the bottom of the fixed platform 103 and includes a closed box 201, a driving component 202, a transmission component 203, an adjusting component 204, and a limiting component 205. The closed box 201 is fixed to the bottom of the fixed platform 103. The driving component 202 is located inside the closed box 201. The transmission component 203 is located at the bottom of the stirring component 105 and cooperates with the driving component 202. The adjusting component 204 is located on both sides of the transmission component 203, and the limiting component 205 is located on both sides of the closed box 201.

[0032] The driving component 202 and the transmission component 203 are used to drive the stirring component 105 to move. The state of rotation of the stirring component 105 can be switched by adjusting the setting of the adjusting component 204, which can improve the efficiency of material mixing and discharge, and play a role in preventing blockage. The limiting component 205 is used to limit the discharge component 104, so that the discharge component 104 cannot move during the operation of the driving component 202, thereby avoiding accidental operation and ensuring high safety.

[0033] Example 2

[0034] Reference Figures 1-4 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0035] Specifically, the discharge component 104 includes a discharge track 104a, a sealing door 104b, and a buckle 104c. A discharge port S is provided at the bottom of one side of the mixing cylinder 101. The discharge track 104a is fixed to the bottom of the discharge port S. The sealing door 104b slides on the discharge track 104a. The buckle 104c is fixed on the mixing cylinder 101.

[0036] The feeding track 104a is U-shaped and inclined. The material is discharged from the feeding port S and then guided to the collection position by the feeding track 104a. The closing door 104b can move up and down to open and close the feeding port S. The selection and use of the buckle 104c can be set by the staff as needed. It is used to pre-fix and limit the closing door 104b after it is pushed up to prevent it from falling accidentally during the feeding process and affecting subsequent operations.

[0037] The stirring component 105 includes a stirring shaft 105a and a stirring blade 105b. The stirring shaft 105a is rotatably connected to the mixing cylinder 101, and the stirring blade 105b is fixed to the surface of the stirring shaft 105a.

[0038] The bottom end of the stirring shaft 105a extends to the bottom of the fixed platform 103. It can be driven by a variable frequency motor or other means. The stirring blade 105b is spiral in shape. When stirring the fertilizer, it can throw the fertilizer particles up, promote the rolling of the fertilizer particles in the tank and fully mix them with the coating agent. It can rotate in the opposite direction when discharging, which can improve the discharge efficiency of the material from the discharge port S. At the same time, since the fertilizer is always stirred, it can avoid excessive fertilizer accumulation near the discharge port S and blockage.

[0039] Example 3

[0040] Reference Figures 1-6 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0041] Specifically, the drive unit 202 includes a drive motor 202a and an output shaft 202b. The drive motor 202a is fixed to the bottom of the fixed platform 103 and located below the enclosed box 201. The output shaft 202b is fixed to the output end of the drive motor 202a, and its top end extends into the enclosed box 201.

[0042] The drive motor 202a is fixed to the bottom of the fixed platform 103 by the mounting bracket. It is a variable frequency motor and operates at a slow speed to prevent the mixing blade 105b from breaking the fertilizer due to excessive speed. Part of the output shaft 202b is located inside the closed box 201, and a small part is located below the closed box 201.

[0043] The drive unit 202 also includes a first gear 202c, a second gear 202d, and a transmission gear 202e. The first gear 202c and the second gear 202d are fixed to the top and bottom of the output shaft 202b, respectively. The transmission gear 202e is disposed on one side of the first gear 202c and meshes with it.

[0044] The first gear 202c is located inside the enclosed box 201 at a slightly higher position. The transmission gear 202e is rotatably connected to the bottom of the fixed platform 103 via a rotating shaft and meshes with the first gear 202c. The second gear 202d is located inside the enclosed box 201 at a slightly higher position, and the diameter of the first gear 202c is smaller than the diameter of the second gear 202d.

[0045] The transmission component 203 includes a third gear 203a and a fourth gear 203b. The bottom end of the stirring shaft 105a extends into the enclosed box 201. The third gear 203a slides on the surface of the stirring shaft 105a and engages with the second gear 202d. The fourth gear 203b is fixed to the top of the third gear 203a and engages with the transmission gear 202e.

[0046] The diameter of the third gear 203a is larger than that of the fourth gear 203b. The engagement is as follows: when the third gear 203a moves to the position where it meshes with the second gear 202d, the second gear 202d drives the third gear 203a and the output shaft 202b to rotate, thereby driving the stirring plate 105b to perform a stirring operation and improve the coating efficiency of the fertilizer. When the third gear 203a moves upward until the fourth gear 203b meshes with the transmission gear 202e, the first gear 202c and the transmission gear 202e drive the fourth gear 203b and the output shaft 202b to rotate. At this time, due to the transmission of the transmission gear 202e, the output shaft 202b rotates in the opposite direction relative to the transmission of the second gear 202d, which drives the stirring plate 105b to rotate in the opposite direction, discharging the fertilizer towards the discharge port S. This also prevents excessive fertilizer from accumulating near the discharge port S and causing blockage.

[0047] The transmission component 203 also includes a protrusion 203c, which is fixed to both sides of the inner wall of the third gear 203a, and a groove P that cooperates with it is opened on the stirring shaft 105a.

[0048] Two protrusions 203c are symmetrically arranged. When the third gear 203a and the fourth gear 203b rotate, the protrusions 203c and the slide groove P can drive the stirring shaft 105a to rotate. At the same time, the two gears can move up and down on the surface of the stirring shaft 105a to switch the rotation direction of the stirring blade 105b. A baffle is fixed at the bottom of the stirring shaft 105a to prevent the third gear 203a and the fourth gear 203b from disengaging from the stirring shaft 105a.

[0049] The adjusting component 204 includes a sliding frame 204a, a connecting rod 204b, a support plate 204c, and a first spring 204d. The sliding frame 204a slides on both sides of the enclosed box 201. A limiting groove V that cooperates with the third gear 203a is provided on the third gear 203a. One end of the connecting rod 204b is fixed to one side of the sliding frame 204a, and the other end is fixed to the bottom of the enclosed door 104b. The support plate 204c is fixed to the top of the fixed platform 103. The first spring 204d is sleeved on the outside of the connecting rod 204b and is located at the bottom of the support plate 204c.

[0050] The sliding frame 204a is U-shaped, and the limiting groove V is symmetrically opened at the top and bottom of the third gear 203a. It is annular, and both ends of the sliding frame 204a slide within the limiting groove V. The connecting rod 204b is divided into three parts: one part is fixed to the sliding frame 204a, one part is fixed to the bottom of the closed door 104b, and the other part is used to connect the two parts. Thus, when the closed door 104b is opened and closed, the sliding frame 204a can be moved up and down by the connecting rod 204b to switch the rotation direction of the stirring plate 105b. That is, when the closed door 104b is opened upward, the rotation direction of the stirring plate 105b is to facilitate material feeding and prevent blockage. When the closed door 104b is closed downward, the rotation direction of the stirring plate 105b is to throw the fertilizer upward and improve the coating efficiency.

[0051] The support plate 204c is L-shaped and contacts the bottom of the feeding track 104a for support. The connecting rod 204b slides on the support plate 204c through a part of the fixed platform 103. A stop block is also fixed on its surface. When the closing door 104b is closed, the stop block contacts the top of the fixed platform 103 and can play a limiting role. One end of the first spring 204d is fixed to the stop block and the other end is fixed to the support plate 204c. It is used to apply a downward reset force to the closing door 104b and the connecting rod 204b, so that in the initial state, the closing door 104b can more stably close the feeding port S.

[0052] The limiting component 205 includes a protruding rod 205a, a movable plate 205b, a hydraulic buffer 205c, a push plate 205d, and a limiting rod 205e. The protruding rod 205a is fixed on both sides of the output shaft 202b and located below the enclosed box 201. The movable plate 205b slides on the bottom of the enclosed box 201 and is located on both sides of the output shaft 202b. The hydraulic buffer 205c is disposed on one side of the movable plate 205b. The push plate 205d is fixed on the outside of the movable plate 205b. The limiting rod 205e slides on one side of the enclosed box 201 and cooperates with the push plate 205d. The sliding frame 204a has an insertion hole K that cooperates with the limiting rod 205e.

[0053] Two protruding rods 205a and two movable plates 205b are provided, symmetrically distributed on both sides of the output shaft 202b. A baffle is fixed at the bottom of the enclosed box 201 and outside the movable plates 205b. A guide rod is fixed between the two baffles. Both movable plates 205b slide on the guide rod to limit their movement. The other end of the hydraulic buffer 205c is also fixed to the baffle. The hydraulic buffer 205c has a slow reset effect. The working principle of this part is existing technology and can be clearly understood by those skilled in the art. The end of the push plate 205d is chamfered. The limiting rod 205e has three parts: two rods that are horizontal to the enclosed box 201, and another part that is fixed to the end of the two rods and perpendicular to the push plate 205d. The side near the push plate 205d is also chamfered.

[0054] The side of the movable plate 205b closest to the protruding rod 205a is arc-shaped. When the output shaft 202b rotates slowly, the protruding rod 205a pushes the movable plate 205b to move outward. During the continuous rotation of the output shaft 202b, the reset of the movable plate 205b is relatively slow due to the action of the hydraulic buffer 205c. Therefore, the movable plate 205b can only reset inward when the output shaft 202b stops rotating. When the movable plate 205b moves outward, the push plate 205d drives the limit rod 205e to move. At this time, the horizontal end of the limit rod 205e will be inserted into the socket K, which can fix the position of the sliding frame 204a and the third gear 203a, and also fix the position of the closed door 104b.

[0055] When the output shaft 202b rotates, it can simultaneously fix the positions of the sliding frame 204a, the third gear 203a, and the closing door 104b. That is, when the equipment is performing coating and feeding operations, the stirring plate 105b can automatically switch to a suitable motion state, and it cannot be manually operated before it stops rotating, which greatly reduces the occurrence of accidental contact and makes the safety performance higher.

[0056] The limiting component 205 also includes a limiting frame 205f, a limiting block 205g, and a second spring 205h. The limiting frame 205f is fixed to both sides of the enclosed box 201, the limiting rod 205e slides inside the limiting frame 205f, the limiting block 205g is fixed on the limiting rod 205e, and the two ends of the second spring 205h are fixed to the limiting block 205g and the limiting frame 205f, respectively.

[0057] Four limit frames 205f are provided, and two limit rods are provided on the two horizontal rod surfaces of the limit rod 205e to limit the limit rod 205e and prevent it from deviating during left and right movement. Limit blocks 205g are provided between each group of two limit frames 205f. The second spring 205h applies a force away from the sliding frame 204a to the limit blocks 205g and the limit rod 205e, making it easier to reset when the output shaft 202b stops rotating.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vertical fertilizer coating system characterized by: The coating machine assembly (100) comprises a mixing cylinder (101), a support (102), a fixed platform (103), a discharge part (104) and a stirring part (105), the support (102) is fixed to the bottom of the mixing cylinder (101), the fixed platform (103) is fixed to the middle of the support (102), the discharge part (104) is arranged at the bottom of one side of the mixing cylinder (101), and the stirring part (105) is arranged in the mixing cylinder (101); and The switching assembly (200) is arranged at the bottom of the fixed platform (103) and comprises a closed box (201), a driving part (202), a transmission part (203), an adjusting part (204) and a limiting part (205), the closed box (201) is fixed to the bottom of the fixed platform (103), the driving part (202) is arranged in the closed box (201), the transmission part (203) is arranged at the bottom of the stirring part (105) and cooperates with the driving part (202), the adjusting part (204) is arranged on both sides of the transmission part (203), and the limiting part (205) is arranged on both sides of the closed box (201); The stirring part (105) comprises a stirring shaft (105a) and stirring blades (105b), the stirring shaft (105a) is rotationally connected in the mixing cylinder (101), and the stirring blades (105b) are fixed to the surface of the stirring shaft (105a); The driving part (202) comprises a driving motor (202a) and an output shaft (202b), the driving motor (202a) is fixed to the bottom of the fixed platform (103) and located below the closed box (201), and the output shaft (202b) is fixed to the output end of the driving motor (202a) and extends to the closed box (201); The driving part (202) further comprises a first gear (202c), a second gear (202d) and a transmission gear (202e), the first gear (202c) and the second gear (202d) are fixed to the top and the bottom of the output shaft (202b) respectively, and the transmission gear (202e) is arranged on one side of the first gear (202c) and meshes with the first gear (202c); The transmission part (203) comprises a third gear (203a) and a fourth gear (203b), the bottom end of the stirring shaft (105a) extends to the closed box (201), the third gear (203a) slides on the surface of the stirring shaft (105a) and cooperates with the second gear (202d), and the fourth gear (203b) is fixed to the top of the third gear (203a) and cooperates with the transmission gear (202e); The transmission part (203) further comprises a protruding block (203c) fixed to the inner walls on both sides of the third gear (203a), and a sliding groove (P) matched with the protruding block (203c) is formed in the stirring shaft (105a). ​ The adjusting piece (204) comprises a sliding frame (204a), a connecting rod (204b), a supporting plate (204c) and a first spring (204d), the sliding frame (204a) is slid on both sides of the closed box (201), a limiting groove (V) matched with the third gear (203a) is formed on the third gear (203a), one end of the connecting rod (204b) is fixed to one side of the sliding frame (204a), the other end is fixed to the bottom of the closed door (104b), the supporting plate (204c) is fixed to the top of the fixed platform (103), the first spring (204d) is sleeved outside the connecting rod (204b) and located at the bottom of the supporting plate (204c).

2. The vertical fertilizer coating system of claim 1, wherein: The discharging piece (104) comprises a discharging track (104a), a closed door (104b) and a buckle (104c), a discharging port (S) is formed at the bottom of one side of the mixing cylinder (101), the discharging track (104a) is fixed to the bottom of the discharging port (S), the closed door (104b) is slid on the discharging track (104a), and the buckle (104c) is fixed to the mixing cylinder (101).

3. The vertical fertilizer coating system of claim 2, wherein: The limiting piece (205) comprises a convex rod (205a), a movable plate (205b), a hydraulic buffer (205c), a push plate (205d) and a limiting rod (205e), the convex rod (205a) is fixed to both sides of the output shaft (202b) and located below the closed box (201), the movable plate (205b) is slid on the bottom of the closed box (201) and located on both sides of the output shaft (202b), the hydraulic buffer (205c) is arranged on one side of the movable plate (205b), the push plate (205d) is fixed outside the movable plate (205b), the limiting rod (205e) is slid on one side of the closed box (201) and matched with the push plate (205d), and the sliding frame (204a) is provided with a jack (K) matched with the limiting rod (205e).

4. The vertical fertilizer coating system of claim 3, wherein: The limiting piece (205) further comprises a limiting frame (205f), a limiting block (205g) and a second spring (205h), the limiting frame (205f) is fixed to both sides of the closed box (201), the limiting rod (205e) is slid in the limiting frame (205f), the limiting block (205g) is fixed to the limiting rod (205e), and the second spring (205h) is fixed at both ends to the limiting block (205g) and the limiting frame (205f).

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