Fertilizer core pretreatment device in coated controlled-release fertilizer production

Abstract

The invention relates to the field of fertilizer production, in particular to a fertilizer core pretreatment device in coated controlled-release fertilizer production, which comprises a support frame, a fixed cylinder arranged on the support frame, a rounding unit arranged on the fixed cylinder, a separation unit arranged on one side of the fixed cylinder, and a recovery unit arranged on the separation unit, the rounding unit comprises a rounding assembly arranged on the fixed cylinder, a connecting ring arranged on the rounding assembly and a first power assembly arranged on the connecting ring; the recovery unit comprises a recovery assembly arranged on the fixed cylinder, a friction assembly arranged on the recovery assembly and a second power assembly arranged on the recovery assembly, the fertilizer cores are driven by the separation holes to roll and rub each other in the grinding cylinder, so that the fertilizer cores are rounded mutually, the surface smoothness of the fertilizer cores is improved, and the fertilizer cores can be recycled. And powder generated by rounding and fertilizer cores with fine particles in the fertilizer cores are screened out by matching with the separation holes, so that the powder is prevented from being adhered to the surfaces of the fertilizer cores.

Description

Technical Field

[0001] The invention relates to the field of fertilizer production, in particular to a fertilizer core pretreatment device in the production of coated controlled-release fertilizer. Background Art

[0002] Coated controlled-release fertilizer is a new type of fertilizer. Compared with ordinary fertilizers, it prolongs the decomposition and release time of fertilizers by coating, wrapping, adding inhibitors, etc., thereby reducing the amount of fertilizer used, improving fertilizer utilization, and increasing crop yields.

[0003] In the production process of coated controlled-release fertilizers, the uniformity and surface roughness of the fertilizer core are important factors affecting the effect of controlled-release fertilizers. Existing pretreatment devices usually only include simple screening and drying steps, which cannot effectively improve the surface quality of the fertilizer core, resulting in pores and thin layers in the core during the coating process, affecting the controlled-release effect of the fertilizer. Summary of the invention

[0004] In view of the fact that the existing pretreatment devices in the above-mentioned or prior art usually only include simple screening and drying steps, which cannot effectively improve the surface quality of the fertilizer core, resulting in pores and thin layers easily appearing in the core during the coating process, affecting the controlled release effect of the fertilizer, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: including a support frame, a fixed cylinder arranged on the support frame, a rounding unit arranged on the fixed cylinder, a separation unit arranged on one side of the fixed cylinder, and a recovery unit arranged on the separation unit; the rounding unit includes a rounding component arranged on the fixed cylinder, a connecting ring arranged on the rounding component, and a first power component arranged on the connecting ring; the recovery unit includes a recovery component arranged on the fixed cylinder, a friction component arranged on the recovery component, and a second power component arranged on the recovery component.

[0007] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, the grinding assembly includes a grinding cylinder arranged in the fixed cylinder, a separation hole arranged on the grinding cylinder, and a stirring plate arranged on the grinding cylinder; the width of the stirring plate is smaller than the diameter of a normal fertilizer core, and the length of the stirring plate is much larger than the width.

[0008] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, wherein: the first power component includes a first motor arranged on the fixed cylinder, an output gear arranged at the output end of the first motor, and an input gear arranged on the connecting ring and meshing with the output gear; a discharge port is rotatably arranged on the connecting ring, and the discharge port is fixedly arranged on the support frame.

[0009] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, wherein: the fixed cylinder is inclined, and a discharge port is provided at the lower end of the fixed cylinder; a separation chamber is provided between the fixed cylinder and the grinding cylinder; and a conveying channel is provided on the fixed cylinder to connect the separation chamber and the recovery component.

[0010] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, wherein: the separation unit includes a separation cylinder arranged below the discharge port, a conveying pipe arranged on the separation cylinder, and a screening assembly arranged on the separation cylinder; the upper end of the separation cylinder is inclined toward the side close to the discharge port, and a channel gate is arranged on the side of the separation cylinder close to the conveying pipe; one end of the conveying pipe is rotatably connected to the friction assembly.

[0011] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, the screening component includes a sieve plate arranged on the separation cylinder, a buffer spring arranged on the sieve plate, a telescopic rod arranged on the sieve plate, and a fixed block arranged on the separation cylinder; one end of the buffer spring and the telescopic rod are fixedly arranged on the fixed block; the diameter of the holes on the sieve plate is slightly larger than the diameter of the fertilizer core; the sieve plate is arranged to be in an inclined state in coordination with the inclination of the upper part of the separation cylinder.

[0012] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, the recovery component includes a recovery cylinder arranged below the conveying pipe, and a separation net arranged on the recovery cylinder, and the separation net divides the internal space of the recovery cylinder into a first collection chamber and a second collection chamber.

[0013] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, the friction assembly includes a rotating sleeve arranged on the recovery cylinder, an upper grinding disc arranged on the rotating sleeve, a lower grinding disc arranged on the upper grinding disc, and a support column arranged on the lower grinding disc.

[0014] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, wherein: the upper grinding disc is provided with a grinding groove, and the grinding groove is spiral; the lower grinding disc is provided with an extrusion groove, and the cross-sectional area of ​​the extrusion groove gradually decreases from the middle to the outside of the lower grinding disc; the cross-sectional area of ​​the lower grinding disc gradually decreases from the middle to the surrounding areas, and the lower grinding disc is also provided with a protrusion connected to the extrusion groove.

[0015] As a preferred solution of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention, the second power component includes a second motor arranged on the recovery drum, an output wheel arranged at the output end of the second motor, and a transmission belt arranged on the output wheel and the rotating sleeve.

[0016] The beneficial effects of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers of the present invention are as follows: the present invention drives the fertilizer cores to roll and rub against each other in the grinding cylinder through the separation holes, so that the fertilizer cores are rounded against each other, thereby improving the surface smoothness of the fertilizer cores; the powder produced by rounding and the fertilizer cores with fine particles in the fertilizer cores are screened out in cooperation with the separation holes to avoid the powder adhering to the surface of the fertilizer cores and to prevent the subsequent coating operation from being uneven; the large-particle fertilizer cores in the fertilizer cores are separated out through the screening component, and are sent into the friction component in cooperation with the conveying pipe; the large-particle fertilizer cores are ground into the size of standard fertilizer cores in cooperation with the friction component, and are used to be put into the grinding cylinder together with the next batch of fertilizer cores to be pretreated, thereby improving the utilization rate of the fertilizer cores; the remaining fertilizer powder and small-particle fertilizer cores are collected through the second collecting chamber and used as raw materials for making fertilizers, thereby reducing material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0019] Figure 2 This is a schematic diagram of the structure of the rounding component of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the fixed cylinder of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0021] Figure 4This is a schematic diagram of the cross-sectional structure of the separation cylinder of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0022] Figure 5 Fertilizer core pretreatment device for the production of coated controlled-release fertilizer Figure 4 A magnified view of the structure in the middle.

[0023] Figure 6 This is a schematic diagram of the structure of the recovery component of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0024] Figure 7 This is a schematic diagram of the cross-sectional structure of the recovery component of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0025] Figure 8 This is a schematic diagram of the cross-sectional structure of the separation net of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0026] Fig. 9 This is a schematic diagram of the upward structure of the rotating sleeve of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0027] Fig.10 This is a schematic diagram of the structure of the lower grinding plate of the fertilizer core pretreatment device in the production of coated controlled-release fertilizers.

[0028] In the figure: 1, support frame; 2, fixed cylinder; 21, discharge port; 22, separation chamber; 23, conveying channel; 3, rounding unit; 31, rounding assembly; 311, rounding cylinder; 312, separation hole; 313, stirring plate; 32, connecting ring; 321, discharge port; 33, first power assembly; 331, first motor; 332, output gear; 333, input gear; 4, separation unit; 41, separation cylinder; 42, conveying pipe; 43, screening assembly; 431, sieve plate; 432, buffer spring Spring; 433, telescopic rod; 434, fixed block; 5, recovery unit; 51, recovery assembly; 511, recovery cylinder; 512, separation net; 513, first collection chamber; 514, second collection chamber; 52, friction assembly; 521, rotating sleeve; 522, upper grinding disc; 5221, grinding groove; 523, lower grinding disc; 5231, extrusion groove; 5232, protrusion; 524, support column; 53, second power assembly; 531, second motor; 532, output wheel; 533, transmission belt. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] Example 1, reference Figure 1 , Figure 2 ,as well as Figure 6, which is the first embodiment of the present invention, and this embodiment provides a fertilizer core pretreatment device in the production of coated controlled-release fertilizers, which includes a support frame 1, a fixed cylinder 2 arranged on the support frame 1, a rounding unit 3 arranged on the fixed cylinder 2, a separation unit 4 arranged on one side of the fixed cylinder 2, and a recovery unit 5 arranged on the separation unit 4, the support frame 1 and the fixed cylinder 2 cooperate to support the entire device, the rounding unit 3 is used to pretreatment the fertilizer core to reduce the roughness of the fertilizer core surface, the separation unit 4 is used to cooperate with the rounding unit 3 to remove the fertilizer cores that do not meet the size and the powder produced by rounding, so as to facilitate the next step, the recovery unit 5 is used to recover the raw materials produced by the pretreatment, and at the same time process the separated large-particle fertilizer cores into sizes that meet the standards; The rounding unit 3 includes a rounding assembly 31 disposed on the fixed cylinder 2 for pre-processing the fertilizer core, a connecting ring 32 disposed on the rounding assembly 31 for driving the rounding assembly 31 to rotate, and a first power assembly 33 disposed on the connecting ring 32 for generating power to drive the connecting ring 32 to rotate; The recovery unit 5 includes a recovery component 51 arranged on the fixed cylinder 2, which is used to collect unqualified raw materials left over from pretreatment, a friction component 52 arranged on the recovery component 51, which is used to process the collected large-particle fertilizer cores into a standard size, and a second power component 53 arranged on the recovery component 51, which is used to drive the friction component 52 to operate.

[0031] In summary, firstly, the fertilizer cores to be processed are put into the rounding component 31, and then the first power component 33 is started to drive the rounding component 31 to rotate. At this time, the fertilizer cores in the rounding component 31 are tumbled, and the fertilizer cores are rubbed against each other to be rounded. At this time, the small-particle fertilizer cores and the powder produced by rounding are separated from the tumbling fertilizer cores by the rounding component 31 and enter the recovery component 51. When the set time is reached, the rounded fertilizer cores are sent to the separation unit 4 through the fixed cylinder 2, and the large-particle cores in the fertilizer cores are separated by the separation unit 4 and sent to the friction component 52. At this time, the second power component 53 is started to control the friction component 52 to process the large-particle fertilizer cores into a standard size, and then the unqualified raw materials and the processed fertilizer cores are collected separately through the recovery component 51.

[0032] Example 2, reference Figure 1-Figure 6, which is the second embodiment of the present invention, and is different from the previous embodiment in that: the fertilizer core is pre-treated. Compared with the embodiment 1, further, the rounding assembly 31 includes a rounding cylinder 311 disposed in the fixed cylinder 2, which is used to hold the fertilizer core to be treated, a separation hole 312 disposed on the rounding cylinder 311, which is used to drive the fertilizer core as a whole to roll with the rotation of the rounding cylinder 311, so that the fertilizer cores rub against each other to be rounded, and a stirring plate 313 disposed on the rounding cylinder 311, which is used to separate the small particle cores in the fertilizer core and the powder produced by rounding; The width of the stirring plate 313 is smaller than the diameter of a normal fertilizer core, and the length of the stirring plate 313 is much larger than the width, which can accelerate the separation of the small-particle fertilizer core and the powder, and prevent the powder from clogging the stirring plate 313 or the powder and the small-particle core from clogging the stirring plate 313.

[0033] The first power assembly 33 includes a first motor 331 disposed on the fixed cylinder 2 for generating power, an output gear 332 disposed at the output end of the first motor 331 for rotating in coordination with the first motor 331, and an input gear 333 disposed on the connecting ring 32 and meshing with the output gear 332 for rotating in coordination with the output gear 332 to drive the connecting ring 32 to rotate, thereby driving the first motor 331 to rotate; A feeding port 321 is rotatably provided on the connecting ring 32 , and the feeding port 321 is fixedly provided on the supporting frame 1 , and is used for feeding the fertilizer cores to be processed into the grinding cylinder 311 .

[0034] The fixed cylinder 2 is tilted to prevent the fertilizer core from remaining in the grinding cylinder 311. A discharge port 21 is provided at the lower end of the fixed cylinder 2. The discharge port 21 is opened and closed by an electronic valve to discharge the ground fertilizer core into the separation unit 4. A separation chamber 22 is provided between the fixed cylinder 2 and the grinding cylinder 311, which is used to guide the separated small-particle fertilizer cores and powder; A conveying channel 23 is provided on the fixed cylinder 2 to connect the separation chamber 22 and the recovery component 51, and is used to deliver the small-particle fertilizer cores and powder on the separation chamber 22 into the recovery component 51 through the conveying channel 23. At the same time, a fan and other devices can be installed on the conveying channel 23 to generate suction in the conveying channel 23 to accelerate the collection efficiency.

[0035] The separation unit 4 includes a separation cylinder 41 disposed below the discharge port 21 for receiving the fertilizer cores released from the discharge port 21, a delivery pipe 42 disposed on the separation cylinder 41 for releasing the large-particle fertilizer cores in the separation cylinder 41, and a screening assembly 43 disposed on the separation cylinder 41 for separating the large-particle fertilizer cores from the rounded fertilizer cores. The upper end of the separation cylinder 41 is inclined toward the side close to the discharge port 21, so that the fertilizer core released from the discharge port 21 can be better received, and the contact area between the fertilizer core and the screening assembly 43 is increased. A channel gate is provided on the side of the separation cylinder 41 close to the conveying pipe 42 to control the communication between the conveying pipe 42 and the separation cylinder 41; One end of the delivery pipe 42 is rotatably connected to the friction assembly 52 .

[0036] The screening assembly 43 includes a sieve plate 431 disposed on the separation cylinder 41, used to separate large-particle fertilizer cores from fertilizer cores, a buffer spring 432 disposed on the sieve plate 431, used to move up and down when impacted by the falling fertilizer cores, and accelerate the qualified fertilizer cores to pass through the sieve plate 431, a telescopic rod 433 disposed on the sieve plate 431, used to limit the moving direction of the buffer spring 432, so that the buffer spring 432 can only drive the sieve plate 431 to move up and down, and a fixed block 434 disposed on the separation cylinder 41, used for supporting. The buffer spring 432 and one end of the telescopic rod 433 are fixedly disposed on the fixing block 434; The diameter of the holes on the sieve plate 431 is slightly larger than the diameter of the fertilizer core, which can accelerate the fertilizer core to pass through the sieve plate 431; The sieve plate 431 is arranged in an inclined state in coordination with the inclination of the upper portion of the separation cylinder 41 , so that the large-particle fertilizer cores can be easily gathered toward the conveying pipe 42 while being separated.

[0037] The rest of the structure is the same as that of Example 1.

[0038] In summary, when the fertilizer core enters the grinding cylinder 311 through the discharge port 321, the first motor 331 is started, and the connection ring 32 is driven to rotate through the cooperation of the output gear 332 and the input gear 333. At this time, the grinding cylinder 311 rotates. At this time, as the grinding cylinder 311 rotates, the separation hole 312 drives the fertilizer core in the grinding cylinder 311 to roll as a whole, so that the fertilizer cores rub against each other to be rounded. At this time, the small particle cores in the fertilizer core and the powder produced by rounding enter the separation chamber 22 through the stirring plate 313. At this time, as the fertilizer core rolls and continuously impacts the fixed cylinder 2, the fixed cylinder 2 is in an inclined state. At this time, the small particle cores and powder in the separation chamber 22 gather downward and enter the recovery component 51 through the conveying channel 23; When the rounding set time is reached, the discharge port 21 is opened. The rounded fertilizer cores enter the separation barrel 41, impacting the sieve plate 431. The sieve plate 431 moves up and down continuously under the action of the buffer spring 432 and the telescopic rod 433, accelerating the qualified fertilizer cores to pass through the sieve plate 431 and enter the next process. The large-particle fertilizer cores are retained on the sieve plate 431 and gathered on the side close to the conveying pipe 42. When no more fertilizer cores flow out of the discharge port 21, the conveying pipe 42 is opened to allow the large-particle fertilizer cores to enter the friction assembly 52 through the conveying pipe 42. The second power assembly 53 is started to drive the friction assembly 52 to run, and the large-particle fertilizer cores entering the friction assembly 52 are processed into a standard size. At this time, the recovery assembly 51 collects the processed large-particle fertilizer cores and the remaining unqualified raw materials separately.

[0039] Example 3, reference Figure 1-Figure 10 , which is the second embodiment of the present invention, and is different from the previous embodiment in that: the raw materials left over from the pretreatment are collected for the next production. Compared with the embodiment 1, further, the recovery component 51 includes a recovery cylinder 511 disposed below the conveying pipe 42, for collecting the incoming unqualified raw materials, and a separation net 512 disposed on the recovery cylinder 511, for separating the processed large-particle fertilizer cores from the remaining unqualified raw materials, and the separation net 512 divides the internal space of the recovery cylinder 511 into a first collection chamber 513 and a second collection chamber 514, the first collection chamber 513 is used to store the processed large-particle fertilizer cores, and the second collection chamber 514 is used to store the remaining unqualified raw materials.

[0040] Among them, the friction assembly 52 includes a rotating sleeve 521 arranged on the recovery cylinder 511, which is used to connect the conveying pipe 42, an upper grinding disc 522 arranged on the rotating sleeve 521, a lower grinding disc 523 arranged on the upper grinding disc 522, which is used to cooperate with the upper grinding disc 522 to grind the added large-particle fertilizer core, and a support column 524 arranged on the lower grinding disc 523, which is used to support the lower grinding disc 523.

[0041] The upper grinding disc 522 is provided with a grinding groove 5221, which is spiral-shaped, so that the upper grinding disc 522 can generate an outward thrust on the fertilizer core entering when rotating, and cooperate with the lower grinding disc 523 to grind the fertilizer core while discharging the fertilizer core to prevent blockage. The lower grinding disc 523 is provided with an extrusion groove 5231, the cross-sectional area of ​​which gradually decreases from the middle of the lower grinding disc 523 to the outside, and is used to cooperate with the grinding groove 5221 to grind the fertilizer core entering the extrusion groove 5231; The cross-sectional area of ​​the lower grinding disc 523 gradually decreases from the middle to the surroundings. A protrusion 5232 is further provided on the lower grinding disc 523 and is connected to the extrusion groove 5231 to prevent the fertilizer core from remaining on the lower grinding disc 523 .

[0042] Among them, the second power assembly 53 includes a second motor 531 arranged on the recovery drum 511, which is used to generate power, an output wheel 532 arranged at the output end of the second motor 531, which is used to cooperate with the second motor 531 to rotate, and a transmission belt 533 arranged on the output wheel 532 and the rotating sleeve 521, which is used to cooperate with the output wheel 532 to rotate and drive the rotating sleeve 521 to rotate.

[0043] The rest of the structure is the same as that of Example 2.

[0044] In summary, when the large-particle fertilizer core enters the rotating sleeve 521, the fertilizer core is dispersed into the extrusion groove 5231 through the protrusion 5232. At this time, the second motor 531 is started. At this time, in conjunction with the output wheel 532 and the transmission belt 533, the rotating sleeve 521 drives the upper grinding disc 522 to rotate. At this time, the grinding groove 5221 rotates, pushing the fertilizer core in the extrusion groove 5231 outward while cooperating with the extrusion groove 5231 to grind the fertilizer core. Finally, the fertilizer core and residue that meet the standards are discharged from the extrusion groove 5231 into the first collecting chamber 513. At this time, the separation net 512 stops the falling fertilizer core, and the remaining residue enters the second collecting chamber 514 through the separation hole 312. The two are stored separately, and the ground fertilizer core above and the next batch of pretreated fertilizer cores are put into the grinding cylinder 311 together, and the residue below is used to make new fertilizer cores.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fertilizer core pretreatment device in the production of coated controlled-release fertilizers, characterized in that: It comprises a support frame (1), a fixed cylinder (2) arranged on the support frame (1), a rounding unit (3) arranged on the fixed cylinder (2), a separation unit (4) arranged on one side of the fixed cylinder (2), and a recovery unit (5) arranged on the separation unit (4); The rounding unit (3) comprises a rounding assembly (31) arranged on the fixed cylinder (2), a connecting ring (32) arranged on the rounding assembly (31), and a first power assembly (33) arranged on the connecting ring (32); The recovery unit (5) comprises a recovery component (51) arranged on the fixed cylinder (2), a friction component (52) arranged on the recovery component (51), and a second power component (53) arranged on the recovery component (51).

2. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 1, characterized in that: The rounding assembly (31) comprises a rounding cylinder (311) arranged in the fixed cylinder (2), a separation hole (312) arranged on the rounding cylinder (311), and a stirring plate (313) arranged on the rounding cylinder (311); The width of the stirring plate (313) is smaller than the diameter of a normal fertilizer core, and the length of the stirring plate (313) is much greater than the width.

3. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 2, characterized in that: The first power assembly (33) comprises a first motor (331) arranged on the fixing cylinder (2), an output gear (332) arranged at the output end of the first motor (331), and an input gear (333) arranged on the connecting ring (32) and meshing with the output gear (332); The connection ring (32) is rotatably provided with a material discharge port (321), and the material discharge port (321) is fixedly arranged on the support frame (1).

4. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 3, characterized in that: The fixed cylinder (2) is arranged in an inclined manner, and a discharge port (21) is arranged at a lower end of the fixed cylinder (2); A separation chamber (22) is provided between the fixed cylinder (2) and the grinding cylinder (311); The fixed cylinder (2) is provided with a conveying channel (23) for connecting the separation chamber (22) and the recovery component (51).

5. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 4, characterized in that: The separation unit (4) comprises a separation cylinder (41) arranged below the discharge port (21), a delivery pipe (42) arranged on the separation cylinder (41), and a screening assembly (43) arranged on the separation cylinder (41); The upper end of the separation cylinder (41) is inclined toward a side close to the discharge port (21), and a channel gate is provided on a side of the separation cylinder (41) close to the conveying pipe (42); One end of the delivery pipe (42) is rotatably connected to the friction assembly (52).

6. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 5, characterized in that: The screening assembly (43) comprises a sieve plate (431) arranged on the separation cylinder (41), a buffer spring (432) arranged on the sieve plate (431), a telescopic rod (433) arranged on the sieve plate (431), and a fixing block (434) arranged on the separation cylinder (41); The buffer spring (432) and one end of the telescopic rod (433) are fixedly disposed on the fixing block (434); The diameter of the holes on the sieve plate (431) is slightly larger than the diameter of the fertilizer core; The sieve plate (431) is arranged in an inclined state in coordination with the inclination of the upper portion of the separation cylinder (41).

7. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 6, characterized in that: The recovery component (51) comprises a recovery cylinder (511) arranged below the delivery pipe (42), and a separation net (512) arranged on the recovery cylinder (511), wherein the separation net (512) divides the internal space of the recovery cylinder (511) into a first collection chamber (513) and a second collection chamber (514).

8. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 7, characterized in that: The friction assembly (52) comprises a rotating sleeve (521) arranged on the recovery drum (511), an upper grinding disc (522) arranged on the rotating sleeve (521), a lower grinding disc (523) arranged on the upper grinding disc (522), and a support column (524) arranged on the lower grinding disc (523).

9. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 8, characterized in that: The upper grinding disc (522) is provided with a grinding groove (5221), and the grinding groove (5221) is spiral-shaped; The lower grinding disc (523) is provided with an extrusion groove (5231), and the cross-sectional area of ​​the extrusion groove (5231) gradually decreases from the middle of the lower grinding disc (523) to the outside; The cross-sectional area of ​​the lower grinding disc (523) gradually decreases from the middle to the periphery, and a protrusion (5232) is also provided on the lower grinding disc (523) and is connected to the extrusion groove (5231).

10. The fertilizer core pretreatment device in the production of coated controlled-release fertilizer according to claim 9, characterized in that: The second power assembly (53) comprises a second motor (531) arranged on the recovery drum (511), an output wheel (532) arranged at the output end of the second motor (531), and a transmission belt (533) arranged on the output wheel (532) and the rotating sleeve (521).

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