Screening structure for blending chemical fertilizer raw materials

Abstract

The utility model relates to the technical field of chemical fertilizer processing, in particular to a screening structure for mixing chemical fertilizer raw materials, which comprises a frame-shaped support, three screening assemblies are arranged in the frame-shaped support, every two adjacent screening assemblies are connected through a connecting rod, each screening assembly comprises a screening barrel, and a barrel cover is connected to the top of each screening barrel through a flange. A feeding pipe is arranged at the top of the barrel cover, a feeding hose is arranged at the top end of the feeding pipe, a first motor is arranged at the top of the barrel cover, an output shaft of the first motor is coaxially connected with a rotating rod, three transverse rods are arranged on the outer wall of the rotating rod, and a plurality of vertical rods distributed at equal intervals are arranged at the bottoms of the outer walls of the transverse rods. A screening net plate is arranged in the annular butt-joint plate, and a conical discharging pipe is arranged at the bottom of the annular butt-joint plate. According to the screening structure for chemical fertilizer raw material blending, through the stirring effect of the first motor and the rotating rod, caked materials can be effectively crushed, and therefore it is ensured that raw materials entering the screening barrel are evenly dispersed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical fertilizer processing, specifically to a screening structure for chemical fertilizer raw material blending. BACKGROUND

[0002] Chemical fertilizer raw material blending is an important process link in the production of chemical fertilizers. The main purpose is to mix different types of chemical fertilizer raw materials according to a specific ratio, so as to ensure the uniformity of the composition of the final chemical fertilizer product and meet the nutrient needs of crops. In actual production, chemical fertilizer raw material blending usually involves multiple solid granular materials. After screening and weighing in the early stage, these materials are conveyed to the blending machine through a conveyor belt for mixing and processing. However, due to the hygroscopicity and caking of chemical fertilizer raw materials during storage or transportation, some caked materials directly enter the blending machine, which can cause uneven mixing of materials in the blending machine and affect the quality and application effect of chemical fertilizer products.

[0003] Patent No. CN217024569U discloses a screening structure for chemical fertilizer raw material blending, which includes a discharge port and a conveyor belt. The discharge port is provided with a filter screen on one side. The lower side of the filter screen is provided with a material guide bin. The material guide bin is located on the upper side of the conveyor belt on one side. A chain for hitting the filter screen and the material guide bin is arranged in the material guide bin. The utility model has a simple structure. Different materials are poured into the discharge port. The materials fall onto the conveyor belt through the material guide bin. The different raw materials are then conveyed to the blending machine for processing. The processing process is simple and convenient. Moreover, during the pouring process, the chain hits the lower side of the material guide bin and the filter screen. The materials are subjected to the action of vibration. This can prevent the accumulation of materials in the material guide bin and avoid the caked materials from falling through the filter screen.

[0004] The above-mentioned prior art uses a chain to hit the lower side of the material guide bin and the filter screen, so that the materials are subjected to the action of vibration. This can prevent the accumulation of materials and reduce the retention of caked materials. However, this method can improve the passability of materials to some extent, but for larger caked materials, the vibration action is often not strong enough to completely break them. This can cause some caked materials to remain on the filter screen. In addition, with the long-term use of the equipment, the filter screen may gradually accumulate caked materials that have not been broken. This can cause the filter screen to be blocked. This not only increases the cleaning frequency of the equipment, but also affects the discharging efficiency of the system. It increases the maintenance and labor costs of production. In view of this, we propose a screening structure for chemical fertilizer raw material blending. SUMMARY

[0005] The purpose of the utility model is to provide a screening structure for chemical fertilizer raw material blending to solve the problems raised in the background art.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of screening structure for mixing chemical fertilizer raw materials, including frame support, the left and right sides between the inner wall of frame support and the position close to front and back sides are equipped with guide rail, guide rail is used to guide screening assembly reciprocating movement along left and right direction;

[0008] Three screening assemblies that are left and right equidistance arrangement are equipped in the frame support, the number of screening assembly can be increased or reduced according to actual needs, just need to increase or reduce the length of frame support and guide rail, the left and right adjacent two screening assemblies are connected by connecting rod, so that multiple screening assemblies can be moved synchronously left and right, realize screening effect;

[0009] The screening assembly includes screening bucket, the top and bottom of screening bucket are open structure, screening bucket is used to accommodate incoming chemical fertilizer raw materials, screening during raw materials, the top flange of screening bucket is connected with bucket cover, the top of bucket cover is equipped with feed pipe, electromagnetic valve is equipped on the feed pipe, to control the switch and flow of feed, the top end of feed pipe is equipped with feed hose, feed hose is connected with chemical fertilizer raw material supply equipment, for conveying chemical fertilizer raw materials into screening bucket;

[0010] The middle part of the top of bucket cover is equipped with first motor, the output shaft of first motor passes through the top of bucket cover and is coaxially connected with rotating rod, the outer wall of rotating rod and the position close to bottom are equipped with three transverse rods arranged in annular array, the bottom of the outer wall of transverse rod is equipped with multiple equidistance arranged vertical rods, rotating rod is driven to rotate by first motor, rotating rod drives transverse rod and vertical rod to rotate, impact and break the caked raw materials, enhance raw material agitation and screening effect, so that the raw materials entering into screening bucket can be all output, to ensure the accuracy of various raw material ratio amount;

[0011] The bottom of the outer wall of screening bucket is equipped with annular butt joint plate, the annular butt joint plate is equipped with screening mesh plate, the bottom of annular butt joint plate is equipped with conical discharge pipe, annular butt joint plate is used to fix screening mesh plate and guide screened material to conical discharge pipe below, conical discharge pipe is used to uniformly guide screened material;

[0012] The middle and lower part of the outer wall of screening bucket is equipped with two protruding plates arranged in front and back symmetry, protruding plate provides additional stability to support screening bucket, the bottom of protruding plate is equipped with U-shaped solid block, multiple left and right equidistance arranged rollers are rotatably connected in the U-shaped solid block, the rollers are located on guide rail, for reducing the friction force of screening assembly when moving on guide rail, ensure smooth operation, the left side of frame support is equipped with reciprocating drive part for driving screening assembly reciprocating movement left and right.

[0013] Preferably, the front and rear sides of the frame-shaped support are provided with L-shaped supports near the left and right ends, two L-shaped supports are arranged opposite to each other, and support plates are arranged between the two L-shaped supports. The top of the two support plates is connected with a feeding assembly, and the support plates provide support for the feeding assembly.

[0014] Preferably, the feeding assembly comprises a U-shaped bottom plate fixedly connected to the top of the support plate, a conveying belt is arranged in the U-shaped bottom plate, and the conveying belt is used for receiving the materials discharged by the screening assembly and conveying the materials to the next process. A third motor is arranged on the front side of the U-shaped bottom plate and used for driving the conveying belt to work. The third motor provides power to drive the conveying belt to run, so that the screened materials can be timely conveyed to the subsequent mixing equipment.

[0015] Preferably, two positioning grooves are arranged on the outer wall of the screening barrel near the bottom, and two fixed bolts are threadedly connected to the outer wall of the annular butt joint plate. The threaded ends of the two fixed bolts are located in the two positioning grooves, respectively. The annular butt joint plate is stably fixed, and is convenient to disassemble and assemble, so that the staff can replace the screening mesh plate with different aperture according to needs.

[0016] Preferably, the top of the screening mesh plate is attached to the bottom of the screening barrel, and the bottom end of the vertical rod is 1-2 mm away from the top of the screening mesh plate, so as to avoid abrasion.

[0017] Preferably, an annular support block is arranged on the inner wall of the annular butt joint plate, and the top of the annular support block abuts against the bottom of the screening mesh plate, so as to provide additional support and ensure that the screening mesh plate does not sink during operation.

[0018] Preferably, the reciprocating driving member comprises a U-shaped plate fixedly connected to the left side of the frame-shaped support, the U-shaped plate is used for supporting and connecting the reciprocating driving member, a second motor is arranged on the top of the U-shaped plate near the left side, the first motor, the second motor and the third motor are cooperatively operated by being connected with an external power supply and a controller, and the output shaft of the second motor penetrates through the top of the U-shaped plate and is coaxially connected with a cam. The second motor drives the cam to rotate, and the cam is used for converting the rotary motion into reciprocating motion.

[0019] Preferably, the reciprocating driving member further comprises a push rod, the right end of the push rod penetrates through the left side of the frame-shaped support and is fixedly connected to the outer wall of the leftmost screening barrel, the push rod is used for transmitting the reciprocating motion to the screening barrel, a U-shaped connecting block is arranged on the left end of the push rod, a spring is arranged on the outer wall of the push rod, the spring is located between the U-shaped connecting block and the frame-shaped support, and the spring provides restoring force to ensure the continuity of the motion. A rotating wheel is rotatably connected between the upper side and the lower side of the inner wall of the U-shaped connecting block, and the outer wall of the rotating wheel abuts against the outer wall of the cam, so that the push rod can smoothly and coordinately perform reciprocating motion.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. The fertilizer raw material blending screening structure effectively solves the problem of caking caused by moisture absorption during storage and transportation of fertilizer raw materials. Through the stirring action of the first motor and rotating rod, the caking material can be effectively broken up, thereby ensuring that the raw materials entering the screening barrel are evenly dispersed and improving the screening efficiency.

[0022] 2. The screening structure for blending fertilizer raw materials, with the combination of conical discharge pipe and screening screen plate, not only improves the discharge efficiency of the screened material, but also avoids the accumulation of material during the discharge process, ensuring that the material can be uniformly and quickly transported to the subsequent blending machine, providing a smooth material flow for the entire production process.

[0023] 3. The screening structure for blending fertilizer raw materials, with its connection design between the annular connecting plate and the screening screen plate, and the use of threaded fixing bolts, facilitates the replacement and maintenance of the screening screen plate, reduces downtime caused by equipment failure during production, and improves the availability and maintenance efficiency of the equipment.

[0024] 4. The screening structure for blending fertilizer raw materials features a reciprocating drive component that enables the screening components to achieve efficient left and right reciprocating motion, enhancing the agitation and screening effect of materials and improving overall production efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall first-view structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall second-view structure of this utility model;

[0027] Figure 3 This is one of the partial structural schematic diagrams of this utility model;

[0028] Figure 4 This is the second partial structural schematic diagram of the present utility model;

[0029] Figure 5 This is a schematic diagram of the screening component structure in this utility model;

[0030] Figure 6 This is a cross-sectional structural diagram of the annular connecting plate in this utility model;

[0031] Figure 7 This is a cross-sectional structural diagram of the screening barrel in this utility model;

[0032] In the figure: 1, frame support; 10, guide rail; 2, screening assembly; 20, screening bucket; 200, positioning groove; 201, convex plate; 21, bucket cover; 210, feeding pipe; 22, first motor; 23, rotating rod; 24, cross rod; 240, vertical rod; 25, annular butt plate; 250, conical discharge pipe; 26, annular supporting block; 27, screening mesh plate; 28, fixing bolt; 29, U-shaped fixed block; 290, roller; 3, feeding hose; 4, reciprocating driving part; 40, U-shaped cross plate; 41, second motor; 42, cam; 43, push rod; 44, U-shaped connecting block; 45, rotating wheel; 46, spring; 5, L-shaped support; 50, supporting cross plate; 6, feeding assembly; 60, U-shaped bottom plate; 61, conveying belt; 62, third motor; 7, connecting rod. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] Please refer to Figures 1-7 The present application provides a technical solution:

[0036] A screening structure for mixing chemical fertilizer raw materials, comprising a frame support 1, guide rails 10 are arranged between the left and right sides of the inner wall of the frame support 1 and close to the front and rear sides, the guide rails 10 are used to guide the screening assembly 2 to move back and forth along the left and right directions;

[0037] Three screening assemblies 2 are arranged in the frame support 1, the number of the screening assemblies 2 can be increased or decreased according to actual needs, only the length of the frame support 1 and the guide rails 10 needs to be increased or decreased, the left and right adjacent two screening assemblies 2 are connected through the connecting rod 7, so that the multiple screening assemblies 2 can move left and right synchronously, and the screening function is realized;

[0038] The screening assembly 2 comprises a screening barrel 20, the top and bottom of which are open structures, and is used to accommodate the incoming fertilizer raw materials and screen the raw materials during the screening process. The top flange of the screening barrel 20 is connected with a barrel cover 21, the top of which is provided with a feeding pipe 210, and an electromagnetic valve is arranged on the feeding pipe 210 to control the opening and closing and flow of the feeding. The top end of the feeding pipe 210 is provided with a feeding hose 3, which is connected with a fertilizer raw material supply device and is used to deliver the fertilizer raw materials into the screening barrel 20.

[0039] A first motor 22 is arranged at the middle of the top of the barrel cover 21, and the output shaft of the first motor 22 is coaxially connected with a rotating rod 23 which penetrates through the top of the barrel cover 21. Three horizontal rods 24 are arranged in an annular array on the outer wall of the rotating rod 23 and close to the bottom. A plurality of vertical rods 240 are arranged on the outer wall of the horizontal rods 24 and are equidistantly arranged. The rotating rod 23 is driven to rotate by the first motor 22, and the rotating rod 23 drives the horizontal rods 24 and the vertical rods 240 to rotate, so as to impact and break the caked raw materials, enhance the stirring and screening effect of the raw materials, and ensure that all the raw materials entering the screening barrel 20 can be output to ensure the accuracy of the proportioning amount of various raw materials.

[0040] A ring-shaped butt joint plate 25 is arranged on the bottom of the outer wall of the screening barrel 20, and a screening mesh plate 27 is arranged in the ring-shaped butt joint plate 25. A conical discharge pipe 250 is arranged at the bottom of the ring-shaped butt joint plate 25. The ring-shaped butt joint plate 25 is used to fix the screening mesh plate 27 and guide the screened materials to the conical discharge pipe 250 below. The conical discharge pipe 250 is used to uniformly guide the screened materials out.

[0041] Two convex plates 201 which are symmetrically arranged front and back are arranged at the middle and lower part of the outer wall of the screening barrel 20. The convex plates 201 provide additional stability to support the screening barrel 20. A U-shaped fixed block 29 is arranged at the bottom of the convex plate 201, and a plurality of rollers 290 which are equidistantly arranged left and right are rotatably connected in the U-shaped fixed block 29. The rollers 290 are arranged on the guide rail 10 and are used to reduce the friction when the screening assembly 2 moves on the guide rail 10, so as to ensure smooth operation. The left side of the frame-shaped support 1 is provided with a reciprocating driving member 4 which is used to drive the screening assembly 2 to move back and forth.

[0042] In this embodiment, L-shaped supports 5 are arranged at the front and back sides and close to the left and right ends of the frame-shaped support 1. Support cross plates 50 are arranged between the two L-shaped supports 5 which are arranged front and back. The top of the two support cross plates 50 is connected with a feeding assembly 6.

[0043] Specifically, the feeding assembly 6 comprises a U-shaped bottom plate 60 fixedly connected to the top of the support transverse plate 50, a conveying belt 61 is arranged in the U-shaped bottom plate 60, and the conveying belt 61 is used for receiving the materials discharged by the screening assembly 2 and conveying the materials to the next process. A third motor 62 for driving the conveying belt 61 to work is arranged on the front side of the U-shaped bottom plate 60. The third motor 62 provides power to drive the conveying belt 61 to run, so that the screened materials are timely conveyed to the subsequent blending equipment.

[0044] Further, two positioning grooves 200 are arranged on the outer wall of the screening barrel 20 and close to the bottom, the outer wall of the annular butt plate 25 is threadedly connected with two fixing bolts 28, the threaded ends of the two fixing bolts 28 are located in the two positioning grooves 200 respectively, so that the annular butt plate 25 is stably fixed and is convenient to disassemble and assemble, thereby facilitating workers to replace the screening mesh plate 27 with different aperture according to needs.

[0045] Further, the top of the screening mesh plate 27 is attached to the bottom of the screening barrel 20, and the bottom end of the vertical rod 240 is 1-2 mm away from the top of the screening mesh plate 27, so as to avoid abrasion.

[0046] Further, the inner wall of the annular butt plate 25 is provided with an annular supporting block 26, the top of the annular supporting block 26 abuts against the bottom of the screening mesh plate 27, so as to provide additional support and ensure that the screening mesh plate 27 does not sink during operation.

[0047] Further, the reciprocating driving member 4 comprises a U-shaped transverse plate 40 fixedly connected to the left side of the frame-shaped support 1, the U-shaped transverse plate 40 is used for supporting and connecting the reciprocating driving member 4, a second motor 41 is arranged on the top of the U-shaped transverse plate 40 and close to the left side, the first motor 22, the second motor 41 and the third motor 62 are all externally connected with a power supply and a controller to work cooperatively, the output shaft of the second motor 41 penetrates through the top of the U-shaped transverse plate 40 and is coaxially connected with a cam 42, the cam 42 is driven to rotate by the second motor 41, and the cam 42 is used for converting the rotary motion into reciprocating motion.

[0048] Further, the reciprocating driving member 4 further comprises a push rod 43, the right end of the push rod 43 penetrates through the left side of the frame-shaped support 1 and is fixedly connected to the outer wall of the leftmost screening barrel 20, the push rod 43 is used for transmitting the reciprocating motion to the screening barrel 20, the left end of the push rod 43 is provided with a U-shaped connecting block 44, a spring 46 is arranged on the outer wall of the push rod 43 and located between the U-shaped connecting block 44 and the frame-shaped support 1, so as to provide restoring force to ensure the continuity of the motion, and a rotating wheel 45 is rotatably connected between the upper side and the lower side of the inner wall of the U-shaped connecting block 44, the outer wall of the rotating wheel 45 abuts against the outer wall of the cam 42, so that the push rod 43 can smoothly and coordinately perform the reciprocating motion.

[0049] The fertilizer raw material mixing screen structure in the embodiment is used, first, the fertilizer raw material is connected to the feeding hose 3 through the external feeding device, and the electromagnetic valve is ensured to be in the open state, after the power is turned on, the first motor 22 starts to operate, the rotating rod 23 rotates, the horizontal rod 24 and the vertical rod 240 drive the fertilizer raw material in the screening barrel 20 to be stirred and impacted to break the caked material, in this way, the material is uniformly dispersed in the screening barrel 20, and all the raw materials can smoothly pass through the screening mesh plate 27;

[0050] When the screening process starts, the material passing through the screening mesh plate 27 flows into the annular butt joint plate 25 and is uniformly discharged through the conical discharge pipe 250 at the bottom of the annular butt joint plate 25, at the same time, the reciprocating driving part 4 starts to work, the second motor 41 drives the cam 42 to rotate, and the push rod 43 moves left and right, so that the plurality of screening assemblies 2 can move left and right at the same time, and the stirring effect of the material is further enhanced;

[0051] The screened material is rapidly conveyed to the subsequent mixing machine through the U-shaped bottom plate 60 and the conveying belt 61, the efficient and smooth production process is ensured, along with the continuous transmission of the material, the working personnel can monitor the working state of the electromagnetic valve and the motors at any time, so that the normal operation of the equipment is ensured, when the screening mesh plate 27 needs to be replaced, only the fixing bolts 28 on the annular butt joint plate 25 are loosened, the mesh plate with different aperture diameters is quickly disassembled and replaced, which is convenient and fast, after the screen structure is used, the efficiency and product quality of the fertilizer production are significantly improved, and uniform nutrient supply is provided for crops.

[0052] The basic principle, main characteristics and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model, and are not used to limit the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A screening structure for blending raw materials of chemical fertilizers, comprising a frame-shaped support (1), characterized in that: The left and right sides of the inner wall of the frame support (1) are provided with guide rails (10) near the front and rear positions, and the frame support (1) is provided with three screening assemblies (2) arranged equidistantly left and right, and the two screening assemblies (2) adjacent left and right are connected by connecting rods (7), the screening assembly (2) comprises a screening barrel (20), the top flange of the screening barrel (20) is connected with a barrel cover (21), the top of the barrel cover (21) is provided with a feeding pipe (210), the feeding pipe (210) is provided with a solenoid valve, the top end of the feeding pipe (210) is provided with a feeding hose (3), the middle of the top of the barrel cover (21) is provided with a first motor (22), the output shaft of the first motor (22) penetrates through the top of the barrel cover (21) and is coaxially connected with a rotating rod (23), the outer wall of the rotating rod (23) and the position close to the bottom are provided with three horizontal rods (24) arranged in a ring array, the bottom of the outer wall of the horizontal rod (24) is provided with a plurality of vertical rods (240) arranged equidistantly, the bottom of the outer wall of the barrel (20) is provided with a ring-shaped butt joint plate (25), the ring-shaped butt joint plate (25) is provided with a screening mesh plate (27), the bottom of the ring-shaped butt joint plate (25) is provided with a conical discharge pipe (250), the middle and lower part of the outer wall of the screening barrel (20) is provided with two convex plates (201) arranged symmetrically front and rear, the bottom of the convex plate (201) is provided with a U-shaped fixed block (29), the U-shaped fixed block (29) is rotatably connected with a plurality of rollers (290) arranged equidistantly left and right, the rollers (290) are located on the guide rail (10), and the left side of the frame support (1) is provided with a reciprocating driving member (4) for driving the screening assembly (2) to move left and right reciprocatingly.

2. The screening structure for blending of chemical fertilizer raw materials according to claim 1, characterized in that: The front and rear sides of the frame support (1) and the positions close to the left and right ends are provided with L-shaped supports (5), and the two L-shaped supports (5) arranged opposite front and rear are provided with support cross plates (50), and the top of the two support cross plates (50) is connected with a feeding assembly (6) in common.

3. The screening structure for blending of chemical fertilizer raw materials according to claim 2, characterized in that: The feeding assembly (6) comprises a U-shaped bottom plate (60) fixedly connected to the top of the support cross plate (50), and the U-shaped bottom plate (60) is provided with a conveying belt (61) therein.

4. The screening structure for blending of chemical fertilizer raw materials according to claim 1, characterized in that: The outer wall of the screening barrel (20) and the position close to the bottom are provided with two positioning grooves (200) arranged symmetrically left and right, and the outer wall of the ring-shaped butt joint plate (25) is threadedly connected with two fixed bolts (28), and the threaded ends of the two fixed bolts (28) are located in the two positioning grooves (200) respectively.

5. The screening structure for blending of chemical fertilizer raw materials according to claim 1, characterized in that: The top of the screening mesh plate (27) is attached to the bottom of the screening barrel (20), and the bottom end of the vertical rod (240) is 1-2mm away from the top of the screening mesh plate (27).

6. The screening structure for blending of chemical fertilizer raw materials according to claim 1, characterized in that: The inner wall of the ring-shaped butt joint plate (25) is provided with a ring-shaped supporting block (26), and the top of the ring-shaped supporting block (26) abuts against the bottom of the screening mesh plate (27).

7. The screening structure for blending of chemical fertilizer raw materials according to claim 1, characterized in that: The reciprocating driving piece (4) comprises a U-shaped horizontal plate (40) fixedly connected to the left side of the frame-shaped support (1), and a second motor (41) is arranged on the top of the U-shaped horizontal plate (40) and close to the left side; the output shaft of the second motor (41) penetrates the top of the U-shaped horizontal plate (40) and is coaxially connected with a cam (42).

8. The screening structure for blending of chemical fertilizer raw materials according to claim 7, characterized in that: The reciprocating driving piece (4) further comprises a push rod (43), the right end of the push rod (43) penetrates the left side of the frame-shaped support (1) and is fixedly connected to the outer wall of the leftmost screening barrel (20), the left end of the push rod (43) is provided with a U-shaped connecting block (44), the outer wall of the push rod (43) is sleeved with a spring (46), the spring (46) is located between the U-shaped connecting block (44) and the frame-shaped support (1), and a rotating wheel (45) is rotatably connected between the upper side and the lower side of the inner wall of the U-shaped connecting block (44); and the outer wall of the rotating wheel (45) abuts against the outer wall of the cam (42).

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