Compound fertilizer bulk material crusher

Abstract

The invention relates to a compound fertilizer bulk material crusher, which comprises: a casing, the top of the casing is provided with a feed inlet, and the bottom of the casing is provided with a discharge outlet; the barrel-shaped filter cover is rotatably arranged in the machine shell through a bearing, filter holes are formed in the peripheral side wall of the barrel-shaped filter cover, and a notch is formed in the position, corresponding to the feeding opening, of the side wall of the barrel-shaped filter cover; a plurality of material returning plates are uniformly distributed on the inner side wall of the barrel-shaped filter casing in the circumferential direction, and the front ends of the material returning plates are bent towards the rotating direction of the barrel-shaped filter casing; the cutter shaft is rotatably and coaxially arranged in the barrel-shaped filter cover through a bearing, and a cutter is mounted on the cutter shaft; a first driving mechanism; by arranging the barrel-shaped filter casing capable of rotating reversely and the internal cutter shaft, an efficient bidirectional shearing and grinding area is formed, hardened compound fertilizer blocks can be specifically crushed, the problem that existing equipment is large in material and small in use or incomplete in crushing is solved, and special machine operation with compact structure, high crushing efficiency and low energy consumption is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fertilizer processing, and in particular to a compound fertilizer large material crusher. BACKGROUND

[0002] Compound fertilizer is prone to hardening and forming hard blocks during storage due to moisture absorption, pressure or chemical reactions. Before use, these hardening large fertilizer blocks need to be crushed to restore their loose state for easy application and mixing. However, the current equipment commonly used to crush hardened compound fertilizer often has the problem of insufficient matching.

[0003] Currently, some production or use sites choose heavy-duty crushers to process hardened fertilizer. Although such equipment has strong crushing force, it is not ideal in terms of economy and applicability for non-high-strength materials such as fertilizer. On the other hand, if a small or ordinary crusher is used, due to its limited structural strength and crushing capacity, it is often difficult to effectively crush high-hardness hardened fertilizer in one pass, and may require repeated crushing, which not only reduces crushing efficiency, but also increases energy consumption and time costs.

[0004] Therefore, there is an urgent need to develop a special crusher for hardened compound fertilizer that can achieve economic, efficient and stable operation while ensuring crushing effect. SUMMARY

[0005] To solve the problems of low efficiency, high cost or unsatisfactory crushing effect of traditional crushers in processing fertilizer in the prior art, the present application provides a compound fertilizer large material crusher with high crushing efficiency and specially designed for the physical properties of hardened compound fertilizer.

[0006] The technical scheme is as follows: a compound fertilizer large material crusher, comprising: a machine shell, the top of the machine shell is provided with a feeding port, and the bottom is provided with a discharging port; a barrel-shaped filter cover is rotatably arranged in the machine shell through a bearing, a filter hole is arranged on the circumferential wall of the barrel-shaped filter cover, and an opening is formed in the side wall of the barrel-shaped filter cover corresponding to the position of the feeding port; a plurality of return plates are uniformly arranged on the inner side wall of the barrel-shaped filter cover, the front end of the return plate is curved towards the rotation direction of the barrel-shaped filter cover; a cutter shaft is coaxially arranged in the barrel-shaped filter cover through a bearing, and a cutter is mounted on the cutter shaft; a first driving mechanism is used to drive the cutter shaft and the barrel-shaped filter cover to rotate in opposite directions.

[0007] As a further preferred solution, the first driving mechanism comprises a first driving motor, a first transmission gear arranged at one end of the cutter shaft, a second transmission gear arranged at one end of the barrel-shaped filter cover, and an intermediate gear; the first driving motor is in transmission connection with the cutter shaft, and the intermediate gear is in meshing connection with the first transmission gear and the second transmission gear; wherein the second transmission gear is an internal gear.

[0008] As a further preferred solution, the barrel-shaped filter cover is fixedly provided with at least one annular ring on each of the two opposite inner side walls perpendicular to the cutter shaft axis; the cutter comprises a connecting portion fixed to the cutter shaft, and a plurality of crushing portions uniformly arranged along the outer side of the connecting portion, the crushing portions being in S-shaped structure extending along the radial direction of the cutter shaft; the inner side wall and / or the outer side wall of the annular ring is / are provided with protrusions at intervals, and the annular ring is embedded in the inner recessed portion of the S-shaped structure, so that an extrusion area is formed between the annular ring and the top and bottom of the inner recessed portion of the S-shaped structure.

[0009] As a further preferred solution, the barrel-shaped filter cover is fixedly provided with a textured disc on the inner side wall perpendicular to the cutter shaft axis, and the disc face of the textured disc is provided with corrugated protrusions along the axial direction thereof.

[0010] As a further preferred solution, a feeding hopper is arranged at the feeding port, and the bottom of the feeding hopper is provided with a primary crushing mechanism for pre-crushing the material.

[0011] As a further preferred solution, the primary crushing mechanism comprises a main shaft horizontally arranged at the lower end of the feeding hopper, a crushing cutter arranged on the main shaft, and a second driving motor for driving the main shaft.

[0012] As a further preferred solution, a collecting bin is connected to the discharging port, and a flat screen is arranged in the collecting bin in an inclined manner for screening the crushed material into fine material and coarse material; the collecting bin is provided with a first discharging port corresponding to the lower end of the flat screen, and a second discharging port for discharging fine material arranged on the side opposite to the first discharging port.

[0013] As a further preferred solution, the higher end of the flat screen is connected to the collecting bin through a hinged shaft, and the lower end is hung at the top of the first discharging port of the collecting bin through a tension spring; a rotating shaft is horizontally arranged in the collecting bin, one end of the rotating shaft is in transmission connection with the first driving motor, and a plurality of cams are arranged on the rotating shaft in an axial direction at intervals; the cams are in periodic contact with the bottom of the collecting bin when rotating, thereby driving the flat screen to vibrate.

[0014] As a further preferred solution, the plurality of cams are staggered along the circumferential direction of the rotating shaft, and the phase angle between the outer convex portions of adjacent cams is 30° to 90°.

[0015] As a further preferred solution, a scrap lifter is also included, the feed end of which is connected with the first discharge port for receiving the coarse particles screened by the flat screen, and the discharge end of which is connected with the top of the feed hopper for feeding the coarse particles back into the circulating crushing.

[0016] Compared with the prior art, the present application has the following advantages: 1. The present application sets up a reversely rotatable barrel-shaped filter cover and an internal cutter shaft, forming a high-efficiency bidirectional shearing and grinding area, which can break the compact compound fertilizer block in a targeted manner, solves the problem of underutilization or incomplete breaking of the existing equipment, and realizes compact structure, high breaking efficiency and low energy consumption.

[0017] 2. The driving mechanism of the present application utilizes the compact meshing of the internal gear and the intermediate gear to reversely rotate the cutter shaft and the filter cover by a single motor, which has direct transmission and good synchronism, simplifies the structure while ensuring powerful breaking, and reduces the manufacturing and maintenance costs.

[0018] 3. The present application embeds a ring-shaped ring in the inner recess of the S-shaped breaking part, forming a changing dynamic extrusion and shearing space between the protrusions and the S-shaped structure when the cutter shaft rotates, which can finely crush the block material entering this area from multiple angles and multiple levels, significantly improving the one-time breaking qualification rate.

[0019] 4. The present application uses a corrugated disc with axial corrugated protrusions, which can produce additional friction and rubbing effects when the material contacts it under the action of centrifugal force, effectively breaking up the compact particles and further refining the particle size of the material.

[0020] 5. The present application adds a preliminary breaking mechanism at the bottom of the feed hopper, which can pre-break the large blocky fertilizer, reduce the instantaneous load of the main crushing area, and prevent clogging.

[0021] 6. The present application connects a material collecting bin with an inclined flat screen at the discharge port, which realizes instant screening of the crushed material, can separate qualified fine material and coarse material that needs to be reworked at one time, and ensures the uniformity of the particle size of the final product.

[0022] In addition, the bottom of the material collecting bin is periodically jolted by a cam linked with the main drive, which cleverly causes the flat screen to vibrate continuously, has high screening efficiency without the need for additional vibration motor, has simple structure, energy saving and reliability.

[0023] Furthermore, multiple cams are staggered at a specific phase angle, so that the excitation force on the screen is more evenly distributed in time and space, avoiding material accumulation or screen hole clogging, and ensuring stable and continuous screening effect.

[0024] 7. The present invention automatically returns the screened coarse particles to the feed inlet through the crushing and lifting mechanism, forming a closed-loop circulation crushing. No manual intervention is required for the return of materials, which not only improves the utilization rate of raw materials, but also ensures that all materials can meet the predetermined fineness requirements. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 2 This is a schematic diagram of the barrel-shaped filter cover and the internal cutting tool of the present invention.

[0027] Figure 3 This is a schematic diagram of the rear structure of the barrel-shaped filter cover of the present invention.

[0028] Figure 4 This is a partial exploded view of the present invention.

[0029] Figure 5 This is a cross-sectional view of the feed hopper of the present invention along its AA direction.

[0030] Figure 6 This is a longitudinal sectional view of the receiving bin of the present invention.

[0031] Figure 7 This is a schematic diagram of the overall structure of the present invention with the addition of a material crushing and hoisting machine.

[0032] The meanings of the reference numerals in the figure are as follows: 1: Machine casing, 11: Feed inlet, 12: Discharge outlet, 13: Receiving bin, 131: First discharge outlet, 132: Second discharge outlet, 14: Flat screen, 141: Hinge shaft, 142: Tension spring, 151: Rotating shaft, 153: Cam, 16: Crusher, 2: Barrel-shaped filter cover, 21: Notch, 22: Return plate, 23: Second transmission gear, 3: Cutter shaft, 31: First transmission gear, 4: Cutting tool, 41: Connecting part, 42: Crushing part, 51: First drive motor, 52: Intermediate gear, 6: Annular ring, 61: Protrusion, 7: Textured disc, 8: Feed hopper, 9: Primary crushing mechanism, 91: Main shaft, 92: Crushing blade, 93: Second drive motor, 10: Frame. Detailed Implementation

[0033] 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.

[0034] like Figures 1-7 This is a preferred embodiment of the compound fertilizer crusher shown. Please refer to [link / reference].Figure 1 The crusher of the embodiment is integrally installed on a stable frame 10. It comprises a semi-closed casing 1, which is provided with a feeding port 11 at the top of one side for feeding the large-sized cemented fertilizer and with a discharging port 12 at the bottom. Inside the casing 1, two main rotating components are coaxially arranged: one is an outer barrel-shaped filter cover 2, and the other is an inner cutter shaft 3. Referring to the drawings in detail, Figures 2-4 The barrel-shaped filter cover 2 is rotatably supported on the inner wall of the casing 1 through a bearing at one end thereof, and a large number of filter holes are uniformly distributed on the cylindrical side wall thereof, allowing the material powder meeting the fineness requirement to pass through, and an opening 21 is formed on the side wall of the barrel-shaped filter cover 2 at a position opposite to the feeding port 11, so as to facilitate the material to enter the internal crushing cavity from the feeding channel. In order to better drive and lift the material during rotation, a plurality of material return plates 22 are circumferentially and uniformly welded on the inner side wall of the barrel-shaped filter cover 2, and the front ends (i.e., the ends away from the inner side wall of the barrel-shaped filter cover 2) of the material return plates 22 are bent towards the rotating direction of the barrel-shaped filter cover 2. This structure can effectively lift the falling or adhered material, so that it is repeatedly thrown to the crushing area, prolongs the residence and collision time of the material in the crushing cavity, and thus improves the crushing efficiency.

[0035] Continuing to refer to Figures 2 to 4 The cutter shaft 3 is coaxially and rotatably arranged in the inner center of the barrel-shaped filter cover 2 through a bearing, and is also rotatably connected with the side wall of the casing 1, and a cutter 4 for crushing is fixedly installed on the cutter shaft 3. In order to drive the cutter shaft 3 and the barrel-shaped filter cover 2 to rotate in opposite directions, so as to form high-efficiency relative movement and shearing force between them and between the material and the inner wall of the casing, the first driving mechanism is arranged in the embodiment. Specifically, the first driving mechanism comprises a first driving motor 51 fixed on the frame, and the output shaft of the motor is in transmission connection with one end of the cutter shaft 3 through a belt wheel set to drive the rotation thereof. At the same end of the cutter shaft 3, a first transmission gear 31 is coaxially and fixedly installed. At the side of the barrel-shaped filter cover 2 corresponding to the first transmission gear 31, a second transmission gear 23 is coaxially and fixedly installed, which is designed as an internal gear. Another intermediate gear 52 is installed on the casing 1 through its own support shaft, and the position is such that it is simultaneously engaged with the first transmission gear 31 and the internal teeth of the second transmission gear 23 (internal gear). When the first driving motor 51 is started, it directly drives the cutter shaft 3 and the first transmission gear 31 to rotate in one direction; the rotation of the first transmission gear 31 is transmitted to the second transmission gear 23 through the intermediate gear 52, and finally drives the barrel-shaped filter cover 2 to rotate in the opposite direction of the cutter shaft 3 due to the transmission of the gear engagement direction. This gear transmission system has compact structure and good synchronism, and only one motor is used to realize the reverse rotation of the core components, which simplifies the power configuration and reduces the cost.

[0036] In order to form a more intense local extrusion and shearing area near the high-speed rotating cutter, so as to thoroughly crush the hard and cemented blocks, at least one annular ring 6 is welded and fixed on the inner side wall of the two opposite inner side walls of the barrel-shaped filter cover 2 perpendicular to the axis of the cutter shaft 3. Figure 4 As shown, two annular rings 6 of different sizes are arranged on one side close to the second transmission gear 23, and one annular ring 6 is arranged on the other side. The inner side wall and the outer side wall of each annular ring 6 are spaced apart and processed with a plurality of hard protrusions 61. At the same time, the cutter 4 mounted on the cutter shaft 3 is designed to have a specific structure. Specifically, the cutter 4 includes a disc-shaped connecting part 41 fixed to the cutter shaft 3 by key connection or welding, and a plurality of structure identical breaking parts 42 uniformly arranged along the outer circumferential surface of the connecting part 41 and extending outward. Each breaking part 42 is in S-shaped bending structure extending along the radial direction of the cutter shaft. In the assembled state, the annular rings 6 on both sides are embedded into the inner recessed part of the S-shaped structure of the breaking part 42 at the corresponding position. When the cutter shaft 3 rotates at high speed with the cutter 4, the S-shaped breaking part 42 will continuously sweep the annular ring 6. At this time, the top and bottom of the inner recessed part of the S-shaped structure will form a rapidly changing and small gap dynamic extrusion and shearing space with the inner and outer side walls of the annular ring 6 with protrusions 61. Any fertilizer block entering this area will be subjected to the combined action of impact, scraping with fixed protrusions and repeated rubbing and shearing in this narrow space, so as to be efficiently crushed into fine particles. This design significantly improves the fine crushing capacity and one-time crushing qualified rate of the cemented material.

[0037] In order to further assist in crushing and dispersing the fine powder that may be agglomerated, a corrugated disc 7 is also fixedly installed on the inner side wall of the barrel-shaped filter cover 2 perpendicular to the axis of the cutter shaft 3. The disc surface of the corrugated disc 7 is processed with corrugated protrusions continuously extending in the axial direction (i.e. parallel to the direction of the cutter shaft axis). When the material is thrown to the inner wall of the casing under the action of centrifugal force and contacts the corrugated disc 7, the corrugated protrusions can produce additional friction and rubbing effect on the material, which helps to disperse the fine particles adhered together, so as to make the particle size of the final discharge more uniform.

[0038] Reference Figure 1 and Figure 5, considering that the initial input of the hardened fertilizer block may be large in size, directly entering the main crushing chamber can easily cause excessive instantaneous load or even blockage, the embodiment is provided with a pre-crushing link on the feeding channel. Specifically, a horn-shaped feeding hopper 8 is installed at the feeding port 11 of the machine shell 1 for receiving and guiding the material. A set of preliminary crushing mechanism 9 is integrated at the bottom outlet of the feeding hopper 8. The mechanism includes a main shaft 91 horizontally installed between the two side plates at the lower end of the feeding hopper 8, a plurality of crushing knives 92 installed on the main shaft 91 in a certain spiral arrangement or uniform arrangement, and a second driving motor 93 directly driving the main shaft 91 to rotate through a shaft coupling. When the large block of fertilizer falls from the feeding hopper 8, it will first pass through the area of the high-speed rotating crushing knife 92 and be initially broken into smaller block or granular shape, and then enter the main crushing chamber through the aperture 21 of the barrel-shaped filter cover 2. This effectively reduces the burden of the main crushing system and ensures the smooth operation of the subsequent process. Of course, other devices similar to the preliminary crushing mechanism 9 can also be used for preliminary crushing of large blocks to ensure their smooth entry into the main crushing chamber.

[0039] In addition, in order to classify the particle size of the crushed material and separate the unqualified coarse particles for reprocessing, the embodiment is connected with a collecting bin 13 below the discharge port 12 of the machine shell 1. A flat sieve screen 14 is installed inside the collecting bin 13 at an angle, and the size of the sieve holes is set according to the particle size requirements of the finished fertilizer. The higher end of the flat sieve screen 14 is connected to the side wall of the collecting bin 13 through a transverse hinged shaft 141, so that it can swing slightly around the shaft; the lower end is suspended on the top of the side wall of the collecting bin 13 through a tension spring 142. The collecting bin 13 is provided with a first discharge port 131 above the lower end of the flat sieve screen 14, for discharging coarse particles that fail to pass through the sieve screen; and a second discharge port 132 is provided at the bottom of the side wall on the opposite side of the first discharge port 131, i.e. below the flat sieve screen 14, for collecting qualified fine materials that pass through the sieve screen. In order to drive the flat sieve screen 14 to vibrate continuously to improve the screening efficiency and prevent the sieve holes from being blocked, the inventor has also designed a clever vibration mechanism. Inside the collecting bin 13 below, a rotating shaft 151 is horizontally arranged, and one end of the rotating shaft 151 is connected to the output shaft of the aforementioned first drive motor 51 through a transmission belt or chain, so that the power of the main machine is utilized without the need for an additional vibration motor. A plurality of cams 153 are installed on the rotating shaft 151 along the axial direction of the rotating shaft 151. When the rotating shaft 151 is rotated, the outer edges of the cams 153 will periodically push upwards and contact and separate from the bottom of the collecting bin 13, thereby transmitting periodic impact force to the entire collecting bin 13 and the flat sieve screen 14 inside it, causing it to vibrate with high frequency and small amplitude. In order to make the excitation force more evenly distributed on the sieve screen surface, avoid one-way flow or local accumulation of materials, the plurality of cams 153 are staggered in the circumferential direction of the rotating shaft 151, i.e. the outer convex parts (highest points) of adjacent cams 153 have a specific phase angle between them, preferably between 30° and 90°. Such a layout makes the cam's lifting action on the bin bottom staggered in time and space, forming a smooth and uniform composite vibration mode.

[0040] Reference Figure 7 Finally, in order to realize the automatic recycling of unqualified coarse particles and form a closed-loop production system, the embodiment also includes a crushed material elevator 16. The feed end (usually the hopper at the bottom) of the crushed material elevator 16 is connected to the first discharge port 131 of the collecting bin 13 through a pipe or chute, for automatically receiving the coarse particles that slide off the flat sieve screen 14. The discharge end, i.e. the discharge port at the top of the crushed material elevator 16, is connected back to the top of the feed hopper 8. In this way, the coarse particles separated by the sieve are automatically lifted and sent back to the inlet of the crusher for the next crushing cycle until their particle size meets the requirements. This greatly improves the utilization rate of raw materials and the consistency of the final product, and realizes continuous and automatic production.

[0041] The working principle and working steps of the compound fertilizer large material crusher are as follows: firstly, the first driving motor 51 and the second driving motor 93 are started. The operator puts the cemented compound fertilizer large material into the feeding hopper 8. During falling, the material is first broken into smaller blocks by the high-speed rotating crushing knife 92 in the primary crushing mechanism 9, and then enters the main crushing cavity in the barrel-shaped filter cover 2 through the gap 21. In the main crushing cavity, the knife shaft 3 drives the S-shaped cutter 4 to rotate at high speed, and the barrel-shaped filter cover 2 rotates in the opposite direction under the gear transmission. The material is repeatedly thrown and impacted under the centrifugal force, the lifting effect of the return plate 22 and the direct impact of the cutter. Especially, when the material is brought into the dynamic extrusion area between the S-shaped crushing part 42 of the cutter 4 and the annular ring 6 with the protrusion 61 on the barrel-shaped filter cover 2, it is further refined under strong shearing and rubbing. Part of the fine particles are thrown out during rotation through the filter hole of the barrel-shaped filter cover 2, and are further dispersed after rubbing with the moire disc 7 on the inner wall of the barrel-shaped filter cover 2, and finally fall into the receiving bin 13 from the bottom discharge port 12. The material entering the receiving bin 13 falls on the inclined vibrating flat screen 14, and the qualified fine material (undersize) passes through the screen hole from the second discharge port 132 to become the finished product; the unqualified coarse material (oversize) slides along the screen surface and is discharged from the first discharge port 131, and is automatically conveyed back to the top of the feeding hopper 8 by the crushed material elevator 16, and reenters the crushing cycle. Thus, the reciprocating, until all the material is crushed to the qualified particle size, completes the entire efficient and continuous crushing operation.

[0042] The above-described embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, several modifications, improvements and substitutions can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A compound fertilizer large material crusher characterized by, The utility model provides a kind of material crushing device, including: Machine shell (1), the top of the machine shell (1) is equipped with feed inlet (11), bottom is equipped with discharge outlet (12); Barrel type filter cover (2), it is rotatably arranged in the machine shell (1) by bearing, the circumferential wall of the barrel type filter cover (2) is equipped with filter hole, and its side wall is opened with gap (21) in the position corresponding to the feed inlet (11);The inner side wall of the barrel type filter cover (2) is uniformly arranged with multiple return material plates (22), and the front end of the return material plate (22) is curved towards the rotating direction of the barrel type filter cover (2); Knife shaft (3), it is rotatably coaxially arranged inside the barrel type filter cover (2) by bearing, and the cutter (4) is installed on the knife shaft (3); First driving mechanism, for driving the knife shaft (3) and the barrel type filter cover (2) reverse rotation.

2. The compound fertilizer large material crusher according to claim 1, characterized in that: The first driving mechanism includes first driving motor (51), first transmission gear (31) equipped in one end of the knife shaft (3), second transmission gear (23) equipped in one end of the barrel type filter cover (2) and intermediate gear (52); The first driving motor (51) is in transmission connection with the knife shaft (3), and the intermediate gear (52) is in meshing with the first transmission gear (31) and the second transmission gear (23) simultaneously;Wherein, the second transmission gear (23) is internal gear.

3. Compound fertilizer macropellet crusher according to claim 1 or 2, characterized in that The barrel type filter cover (2) is fixedly provided with at least one annular ring (6) on two opposite inner side walls perpendicular to the axis of the knife shaft (3) respectively; The cutter (4) includes the connecting portion (41) fixed with the knife shaft (3), and the plurality of crushing parts (42) uniformly arranged along the outside of the connecting portion (41), and the crushing part (42) is S-shaped structure extending along the radial direction of the knife shaft; The inner side wall and / or the outer side wall of the annular ring (6) are provided with protrusions (61) at intervals, and the annular ring (6) is embedded in the recessed part of the S-shaped structure, so that the annular ring (6) and the top and bottom of the recessed part of the S-shaped structure form a squeezing area.

4. The compound fertilizer large material crusher according to claim 1, characterized in that: The barrel type filter cover (2) is fixedly provided with a corrugated disc (7) on the inner side wall perpendicular to the axis of the knife shaft (3), and the disc surface of the corrugated disc (7) is provided with corrugated protrusions in the axial direction.

5. The compound fertilizer large material crusher according to claim 1, characterized in that: The feed inlet (11) is provided with a feed hopper (8), and the bottom of the feed hopper (8) is provided with a preliminary crushing mechanism (9) for pre-crushing the material.

6. The compound fertilizer macropellet crusher according to claim 5, characterized in that: The preliminary crushing mechanism (9) includes a main shaft (91) horizontally installed at the lower end of the feed hopper (8), a crushing knife (92) installed on the main shaft (91), and a second driving motor (93) driving the main shaft (91).

7. The compound fertilizer macerating machine of claim 1, wherein: The discharge outlet (12) is connected with a material collecting bin (13), and the material collecting bin (13) is provided with an inclined flat screen (14) inside, which is used for screening the crushed material into fine material and coarse material.

8. The compound fertilizer macropellet crusher according to claim 7, characterized in that: The higher end of the flat screen (14) is connected with the collecting bin (13) through a hinged shaft (141), and the lower end is hung on the top of the first discharge port (131) of the collecting bin (13) through a tension spring (142); A rotating shaft (151) is horizontally arranged in the collecting bin (13), one end of the rotating shaft (151) is drivingly connected with a first driving motor (51), a plurality of cams (153) are axially and spaced arranged on the rotating shaft (151), the cams (153) periodically contact the bottom of the collecting bin (13) when rotating, thereby driving the flat screen (14) to vibrate.

9. The compound fertilizer macerating machine of claim 8, wherein: The plurality of cams (153) are staggered arranged along the circumference of the rotating shaft (151), and the phase angle between the outer convex parts of adjacent cams (153) is 30° to 90°.

10. The compound fertilizer macerating machine of claim 7, wherein: A crushed material elevator (16) is further included, the feeding end of the crushed material elevator (16) is connected with the first discharge port (131) for receiving the coarse particles screened by the flat screen (14), and the discharging end of the crushed material elevator (16) is connected with the top of the feeding hopper (8) for re-feeding the coarse particles into the circulating crushing.

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