A mixing machine for chemical fertilizer production and a method for preventing dust diffusion

Abstract

The application discloses a mixing machine for preventing dust diffusion in chemical fertilizer preparation and a use method, and relates to the technical field of dustproof mixing machines; the mixing machine comprises a device main body, a mixing mechanism is arranged in the device main body, a screening mechanism is arranged at the top of the device main body, the screening mechanism comprises an annular top seat, the annular top seat is fixed to the top of the device main body, an annular lifting seat is slidably connected to the inner wall of the annular top seat, an annular sliding groove is formed in the inner side of the annular lifting seat, an annular sieve frame is rotatably installed in the annular sliding groove of the annular lifting seat, an annular sieve plate is fixed to the inner side of the annular sieve frame, and the annular sieve plate and the annular sieve frame are concentrically arranged. The screening mechanism and the mixing mechanism are arranged, the screening mechanism is used for screening when feeding, so that the particle size and shape are ensured to be as consistent as possible, and the screened material is subjected to mixing treatment by the mixing mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dustproof mixers, in particular to a fertilizer preparation mixer capable of preventing dust diffusion and a use method thereof. BACKGROUND

[0002] In the process of fertilizer production, the components usually need to be mixed. The conventional method is to add raw material particles into a mixer for mixing. How to ensure the consistency of particle size, shape and density to avoid uneven application during fertilization is a problem to be considered.

[0003] According to the search, the patent with the Chinese patent application number CN201721516729.X discloses a granular feed mixing device, which comprises a bottom plate, the upper surfaces of the bottom plate are fixedly connected with the lower surfaces of first and second support plates, the upper surface of the first support plate is fixedly connected with the lower surface of a first fixed plate, and the right side surface of the first fixed plate is fixedly connected with the left side surface of a second fixed plate. The mixing device in the above-mentioned document has the following disadvantages: although it can meet certain use requirements, it cannot ensure the consistency of particle size and needs to be improved. SUMMARY

[0004] The present application aims to solve the problems in the prior art and provides a fertilizer preparation mixer capable of preventing dust diffusion and a use method thereof.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A fertilizer preparation mixer capable of preventing dust diffusion comprises a device main body, a mixing mechanism arranged in the device main body, and a screening mechanism arranged on the top of the device main body.

[0007] An annular top seat is fixed to the top of the device main body.

[0008] An annular lifting seat is slidably connected to the inner wall of the annular top seat and has an annular sliding groove formed in the inner side thereof.

[0009] An annular sieve frame is rotatably installed in the annular sliding groove of the annular lifting seat.

[0010] An annular sieve plate is fixed to the inner side of the annular sieve frame and is concentrically arranged with the annular sieve frame. The height of the annular sieve plate is higher than that of the bottom surface of the annular sieve frame, and the inner side of the annular sieve frame smoothly transitions to the annular sieve plate.

[0011] A sieve disc has an annular elastic connecting part connected between the circumferential outer wall of the sieve disc and the annular sieve plate.

[0012] The mixing mechanism comprises:

[0013] A central cylinder is provided with uniformly distributed arc-shaped columns at the bottom, the bottom ends of the arc-shaped columns are fixed to the inner wall of the bottom of the device body, the bottom of the device body is provided with a discharge port, the arc-shaped columns are distributed on the outer side of the top circumference of the discharge port, and a strip-shaped port is arranged between adjacent arc-shaped columns, and the inside of the device body is communicated with the discharge port through the strip-shaped port;

[0014] A plugging assembly is installed in the central cylinder and used for controlling the opening and closing of the discharge port at the bottom of the device body;

[0015] A mixing assembly is rotatably installed on the central cylinder;

[0016] A driving assembly is used for driving the rotation of the mixing assembly.

[0017] As a preferred embodiment of the present application, the mixing assembly comprises:

[0018] A rotating frame is rotatably installed on the central cylinder;

[0019] A pushing frame is fixed to the end of the rotating frame;

[0020] A mixing arm is installed on the bottom outer wall of the pushing frame.

[0021] As a preferred embodiment of the present application, a lifting driving assembly is installed at the top of the device body, the lifting driving assembly comprises an electric telescopic cylinder, the electric telescopic cylinder is fixed to the device body, the output end of the electric telescopic cylinder is fixed with a connecting plate, and the connecting plate is fixed to the annular lifting seat;

[0022] An arc-shaped cover is fixed at the bottom of the sieve disc, the arc-shaped cover is located directly above the central cylinder, and the top of the central cylinder is provided with an arc surface structure matched with the arc-shaped cover.

[0023] As a preferred embodiment of the present application, a side support is fixed on the sieve disc, a vertical rod is fixed at the bottom of the annular sieve plate, a vertical pipe sleeve is fixed at the end of the side support, the vertical pipe sleeve is slidably connected to the outer wall of the vertical rod, and an inclined pipe sleeve is arranged at the bottom end of the vertical pipe sleeve; the positions of the vertical pipe sleeve and the inclined pipe sleeve are matched with the pushing frame.

[0024] Uniformly circumferentially distributed vertical plates are arranged at the junction of the annular sieve frame and the annular sieve plate, and the gap between two adjacent vertical plates is greater than the gap of the sieve disc, the annular sieve plate and the annular sieve frame.

[0025] As a preferred embodiment of the present application, the driving assembly comprises:

[0026] A first driving motor is installed on one side of the outer wall of the central cylinder through a support;

[0027] A driving gear is installed on the output end of the first driving motor, and the circumferential outer wall of the rotating frame is provided with uniformly distributed protruding teeth, and the driving gear is engaged with the protruding teeth.

[0028] As a preferred embodiment of the present application, a first discharge port is formed on the circumferential side of the annular lifting seat and the annular chute, and a second discharge port is formed on the circumferential outer wall of the annular top seat.

[0029] When the positions of the vertical pipe sleeve and the inclined pipe sleeve are matched with the top of the rotating frame, the second discharge port is located above the first discharge port, and the height of the inner wall of the bottom surface of the annular screen frame gradually decreases away from the center.

[0030] As a preferred embodiment of the present application, a ring-shaped feeding groove is fixed to the outside of the annular top seat, the ring-shaped feeding groove is located below the second discharge port, one side of the ring-shaped feeding groove is connected to a collecting box through a discharge channel, and the height of the ring-shaped feeding groove and the discharge channel gradually decreases towards the collecting box.

[0031] As a preferred embodiment of the present application, a top cover is detachably installed on the top of the annular lifting seat, a feeding channel is arranged on the top cover, the feeding channel is arranged in a Z-shaped structure, a ring-shaped support is installed on the top of the annular top seat through a support, a first curtain is arranged on the outside of the ring-shaped support and uniformly distributed in a circumferential direction, and the first curtain is located outside the second discharge port.

[0032] As a preferred embodiment of the present application, the plugging assembly comprises:

[0033] A second driving motor is installed on the inner wall of the central cylinder through a support.

[0034] A screw rod is in transmission connection with the output end of the second driving motor at one end.

[0035] A screw cylinder is in threaded connection with the outer wall of the screw rod.

[0036] A plugging plug is in sliding connection with the inside of an annular structure formed by the arc-shaped columns in an up-down direction, the inner diameter of the annular structure is matched with the inner diameter of the discharge port, an arc-shaped sliding block is arranged on the circumferential outer wall of the plugging plug, and the arc-shaped sliding block is in sliding connection with the strip-shaped port in an up-down direction.

[0037] A second curtain is arranged on the bottom of the device body and distributed in a circumferential direction, the second curtain is located outside the discharge port, and a receiving box is arranged below the discharge port.

[0038] As a preferred embodiment of the present application, the use method of the mixing machine comprises the following steps:

[0039] S1: feeding materials into the inside of the annular lifting seat through the feeding channel.

[0040] S2: The lifting driving assembly works to drive the screening mechanism to descend, so that the position of the inclined pipe sleeve is adapted to the top of the poking frame;

[0041] S3: The first driving motor works to drive the poking frame to rotate, intermittently hits the inclined pipe sleeve, and promotes the screening mechanism to vibrate to accelerate screening;

[0042] S4: The lifting driving assembly works to drive the screening mechanism to descend, so that the position of the vertical pipe sleeve is adapted to the top of the poking frame;

[0043] S5: The first driving motor works to drive the poking frame to rotate, pokes the vertical pipe sleeve, drives the screening mechanism to rotate, and utilizes the centrifugal force to transport the un-screened material into the annular screen frame;

[0044] S6: The lifting driving assembly works to drive the screening mechanism to ascend, so that the position of the first discharge port is adapted to the second discharge port, thereby guiding the un-screened material out of the device and collecting the material by the collecting box;

[0045] S7: The first driving motor continues to work to drive the mixing arm to mix and process the materials;

[0046] S8: After the mixing is completed, the second driving motor works to unblock the discharge port, and the material is discharged from the discharge port.

[0047] The present application has the following beneficial effects:

[0048] The present application is provided with the screening mechanism and the mixing mechanism, so that the screening mechanism can be used for screening when the material is added, so as to ensure that the particle size and shape are as consistent as possible; and the un-screened material is mixed and processed by the mixing mechanism.

[0049] The present application is provided with the arc-shaped cover, the annular elastic connecting part and other structures, so that the screening mechanism can be lifted and descended based on the working of the lifting driving assembly; when the arc-shaped cover moves downward and contacts the top of the central cylinder, the screening disc can be lifted upward under the cooperation of the deformation of the annular elastic connecting part, the relative movement between the screening disc and the annular screen plate is utilized to increase the flowability of the material in the screening mechanism, so as to improve the screening efficiency.

[0050] The present application is provided with the vertical pipe sleeve and the inclined pipe sleeve and other structures, so that the vertical pipe sleeve or the inclined pipe sleeve can be moved to the movement track of the top of the poking frame based on the stroke when the screening mechanism is controlled to descend by the lifting driving assembly; when the vertical pipe sleeve is located on the movement track of the top of the poking frame, the vertical pipe sleeve can be poked by the poking frame, and the whole screening mechanism is driven to rotate, so as to guide the un-screened material to the annular screen frame by the centrifugal force; when the inclined pipe sleeve is located on the movement track of the top of the poking frame, the poking frame and the inclined pipe sleeve contact each other, the inclined pipe sleeve can be pushed upward, the inclined pipe sleeve is intermittently hit, and the screening disc is continuously vibrated to improve the screening efficiency.

[0051] The application can drive the annular lifting seat to lift based on the operation of the lifting driving assembly, until the positions of the first discharge port and the second discharge port are adapted, since the height of the inner wall of the bottom surface of the annular screen frame gradually decreases in the direction away from the center, thus the material not screened can be discharged from the second discharge port.

[0052] The application can effectively block dust and improve practicability by setting the top cover, the feeding channel and the first curtain, and can block the discharge port by the blocking plug, and when it is needed to open, the second driving motor is operated to drive the screw to rotate, and then the blocking plug is driven to move upward under the cooperation of the arc-shaped sliding block sliding in the strip-shaped port, so as to open the discharge port, facilitating discharging. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 A structure diagram of the mixing machine for preparing chemical fertilizer to prevent dust diffusion is provided;

[0054] Figure 2 A structure diagram of the top cover of the mixing machine for preparing chemical fertilizer to prevent dust diffusion is provided;

[0055] Figure 3 A structure diagram of the device main body of the mixing machine for preparing chemical fertilizer to prevent dust diffusion is provided;

[0056] Figure 4 A structure diagram of the annular lifting seat, the second annular screen plate and the annular top seat of the mixing machine for preparing chemical fertilizer to prevent dust diffusion are provided;

[0057] Figure 5 A structure diagram of the mixing mechanism of the mixing machine for preparing chemical fertilizer to prevent dust diffusion is provided;

[0058] Figure 6 A structure diagram of the center cylinder of the mixing machine for preparing chemical fertilizer to prevent dust diffusion is provided.

[0059] In the diagram: 1. Main body of the device; 2. Lifting drive assembly; 3. Top cover; 4. Feeding channel; 5. Annular support; 6. First baffle; 7. Discharge channel; 8. Collection box; 9. Receiving box; 10. Second baffle; 11. Annular lifting seat; 12. Central cylinder; 13. Convex tooth; 14. Electric telescopic cylinder; 15. Vertical plate; 16. Annular elastic connection part; 17. Annular feeding trough; 18. Drive gear; 19. Pulley; 20. Mixing arm; 21. Annular screen plate; 22. Side support; 23. Vertical sleeve; 24. Annular top seat; 25. Inclined sleeve; 26. Second discharge port; 27. Arc-shaped cover; 28. Screen plate; 29. ​​Annular screen frame; 30. First discharge port; 31. First drive motor; 32. Rotating frame; 33. Arc-shaped column; 34. Discharge port; 35. Sealing plug; 36. Strip-shaped port; 37. Screw; 38. Second drive motor; 39. Screw barrel; 40. Arc-shaped slider. Detailed Implementation

[0060] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0061] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Example 1:

[0062] A mixer for fertilizer preparation that prevents dust dispersion, such as Figures 1-6 As shown, the device includes a main body 1, a mixing mechanism is provided inside the main body 1, and a screening mechanism is provided on the top of the main body 1. The screening mechanism includes:

[0063] Annular top seat 24, which is fixed to the top of the main body 1 of the device;

[0064] An annular lifting seat 11 is slidably connected to the inner wall of the annular top seat 24, and an annular groove is provided on the inner side of the annular lifting seat 11.

[0065] The annular screen frame 29 is rotatably installed in the annular sliding groove of the annular lifting seat 11.

[0066] The annular screen plate 21 is fixed to the inner side of the annular screen frame 29. The annular screen plate 21 and the annular screen frame 29 are concentrically arranged. The height of the annular screen plate 21 is higher than the height of the bottom surface of the annular screen frame 29, and there is a smooth transition between the inner side of the annular screen frame 29 and the annular screen plate 21.

[0067] The sieve disc 28 has the same annular elastic connection part 16 connecting its outer circumference and the annular sieve plate 21.

[0068] The mixing mechanism comprises:

[0069] The center tube 12 is provided with uniformly distributed arc-shaped columns 33 at the bottom, the bottom ends of the arc-shaped columns 33 are fixed to the inner wall of the bottom of the device body 1, the bottom of the device body 1 is provided with a discharge port, the arc-shaped columns 33 are distributed on the outer side of the top circumference of the discharge port, and a strip-shaped port 36 is arranged between adjacent arc-shaped columns 33, and the inside of the device body 1 is communicated with the discharge port through the strip-shaped port 36;

[0070] The plugging assembly is installed in the center tube 12 and is used for controlling the opening and closing of the discharge port 34 at the bottom of the device body 1;

[0071] The mixing assembly is rotatably installed on the center tube 12;

[0072] The driving assembly is used for driving the rotation of the mixing assembly;

[0073] By arranging the screening mechanism and the mixing mechanism, the screening mechanism can be used for screening during feeding, so that the particle size and shape are as consistent as possible; the screened material is subjected to mixing treatment by the mixing mechanism.

[0074] In order to facilitate mixing treatment; as shown in Figure 3 、 Figure 5 The mixing assembly comprises:

[0075] The rotating frame 32 is rotatably installed on the center tube 12;

[0076] The pushing frame 19 is fixed to the end of the rotating frame 32;

[0077] The mixing arm 20 is installed on the bottom outer wall of the pushing frame 19.

[0078] In order to improve the screening efficiency; as shown in Figures 2-5 The lifting driving assembly 2 is installed at the top of the device body 1, the lifting driving assembly 2 comprises an electric telescopic cylinder 14, the electric telescopic cylinder 14 is fixed to the device body 1, the output end of the electric telescopic cylinder 14 is fixed with a connecting plate, and the connecting plate is fixed to the annular lifting seat 11;

[0079] The arc-shaped cover 27 is fixed to the bottom of the sieve disc 28 and is located directly above the center tube 12, and the top of the center tube 12 is in an arc surface structure matched with the arc-shaped cover 27;

[0080] By setting the arc cover 27, the annular elastic connecting part 16 and other structures, the screening mechanism can be driven to lift based on the operation of the lifting driving assembly 2. When the arc cover 27 moves downward and contacts the top of the center cylinder 12, the sieve disc 28 can be lifted upward under the cooperation of the deformation of the annular elastic connecting part 16. The relative movement between the sieve disc 28 and the annular sieve plate 21 can increase the flowability of the material in the screening mechanism, thereby improving the screening efficiency.

[0081] In order to improve the screening efficiency, as shown in the drawings, the sieve disc 28 is fixed with a side support 22; the bottom of the annular sieve plate 21 is fixed with a vertical rod, the end of the side support 22 is fixed with a vertical pipe sleeve 23, the vertical pipe sleeve 23 is slidingly connected to the outer wall of the vertical rod, and the bottom end of the vertical pipe sleeve 23 is integrally provided with an inclined pipe sleeve 25; the positions of the vertical pipe sleeve 23 and the inclined pipe sleeve 25 are matched with the shift bracket 19; Figure 4

[0082] The junction of the annular sieve frame 29 and the annular sieve plate 21 is provided with vertically distributed vertical plates 15, and the gap between two adjacent vertical plates 15 is greater than the gap of the sieve holes of the sieve disc 28, the annular sieve plate 21 and the annular sieve frame 29.

[0083] By setting the vertical pipe sleeve 23 and the inclined pipe sleeve 25 and other structures, the vertical pipe sleeve 23 or the inclined pipe sleeve 25 can be moved to the top of the shift bracket 19 based on the different strokes when the screening mechanism is controlled to descend by the lifting driving assembly 2. When the vertical pipe sleeve 23 is located on the movement track of the top of the shift bracket 19, the shift bracket 19 can be used to shift the vertical pipe sleeve 23, thereby driving the whole screening mechanism to rotate, so as to guide the un-screened material to the annular sieve frame 29 by the centrifugal force. When the inclined pipe sleeve 25 is located on the movement track of the top of the shift bracket 19, the shift bracket 19 contacts the inclined pipe sleeve 25, which can push the inclined pipe sleeve 25 upward, so as to intermittently hit the inclined pipe sleeve 25, thereby promoting the sieve disc 28 to vibrate continuously, so as to improve the screening efficiency.

[0084] In order to facilitate the rotation of the rotating frame 32, as shown in the drawings, the driving assembly comprises: Figure 5

[0085] The first driving motor 31 is mounted on one side of the outer wall of the center cylinder 12 through a support;

[0086] The driving gear 18 is mounted on the output end of the first driving motor 31, and the circumferential outer wall of the rotating frame 32 is provided with uniformly distributed protrusions 13, and the driving gear 18 is engaged with the protrusions 13.

[0087] In order to facilitate the discharge of un-screened material, as shown in the drawings, Figure 3 , Figure 4 ​​As shown, the annular lifting seat 11 and the annular chute are provided with a first discharge port 30 matched with the annular sieve frame 29; the annular top seat 24 is provided with a second discharge port 26 on the outer wall of the circumference;

[0088] When the vertical pipe sleeve 23 and the inclined pipe sleeve 25 are matched with the top of the push frame 19, the second discharge port 26 is located above the first discharge port 30; the height of the inner wall of the bottom surface of the annular sieve frame 29 gradually decreases away from the center;

[0089] Through the structure of the first discharge port 30 and the second discharge port 26, the lifting driving assembly 2 can drive the annular lifting seat 11 to lift until the positions of the first discharge port 30 and the second discharge port 26 are matched, and since the height of the inner wall of the bottom surface of the annular sieve frame 29 gradually decreases away from the center, the materials not sieved can be discharged from the second discharge port 26.

[0090] In order to facilitate collection; as Figure 2 、 Figure 3 As shown, the annular top seat 24 is fixed with an annular feeding groove 17 on the outside, the annular feeding groove 17 is located below the second discharge port 26, one side of the annular feeding groove 17 is communicated with a collection box 8 through a discharge channel 7, and the height of the annular feeding groove 17 and the discharge channel 7 gradually decreases towards the collection box 8.

[0091] In order to achieve the effect of dust prevention; as Figure 2 As shown, the top of the annular lifting seat 11 is detachably mounted with a top cover 3, the top cover 3 is provided with a feeding channel 4, the feeding channel 4 is provided in a Z-shaped structure, the top of the annular top seat 24 is mounted with an annular support 5 through a support, the annular support 5 is provided with a first curtain 6 evenly distributed on the circumference on the outside, and the first curtain 6 is located outside the second discharge port 26.

[0092] Through the structure of the top cover 3, the feeding channel 4 and the first curtain 6, dust can be effectively blocked, and the practicability is improved. Embodiment 2:

[0093] A mixing machine for preventing dust diffusion in the preparation of chemical fertilizers, as Figures 1-6 In order to facilitate discharge; based on the embodiment 1, the following improvements are made in the embodiment:

[0094] A second driving motor 38 is mounted on the inner wall of the center cylinder 12 through a support;

[0095] A screw rod 37 is in transmission connection with the output end of the second driving motor 38 at one end;

[0096] A screw cylinder 39 is in threaded connection with the outer wall of the screw rod 37;

[0097] A blocking plug 35 is slidably connected to the inner side of the annular structure formed by the arc-shaped columns 33, and the inner diameter of the annular structure is matched with the inner diameter of the discharge port 34. An arc-shaped sliding block 40 is arranged on the outer wall of the blocking plug 35, and the arc-shaped sliding block 40 is slidably connected to the strip-shaped port 36.

[0098] By arranging the blocking assembly, the discharge port 34 can be blocked by the blocking plug 35. When it is needed to open, the second driving motor 38 is operated to drive the screw rod 37 to rotate, and then the blocking plug 35 is driven to move upward under the cooperation of the arc-shaped sliding block 40 sliding in the strip-shaped port 36, so as to open the discharge port 34, thereby facilitating the discharging.

[0099] In order to facilitate the receiving of materials, as shown in the drawings, the device body 1 is provided with a second curtain 10 which is circumferentially distributed and located outside the discharge port 34. A receiving box 9 is arranged below the discharge port 34. Figure 3

[0100] The use method of the mixing machine comprises the following steps:

[0101] S1: The materials are added into the inner side of the annular lifting seat 11 through the feeding channel 4;

[0102] S2: The lifting driving assembly 2 is operated to drive the screening mechanism to descend, so that the position of the inclined pipe sleeve 25 is matched with the top of the stirring frame 19;

[0103] S3: The first driving motor 31 is operated to drive the stirring frame 19 to rotate, so as to intermittently hit the inclined pipe sleeve 25 and promote the screening mechanism to vibrate and accelerate the screening;

[0104] S4: The lifting driving assembly 2 is operated to drive the screening mechanism to descend, so that the position of the vertical pipe sleeve 23 is matched with the top of the stirring frame 19;

[0105] S5: The first driving motor 31 is operated to drive the stirring frame 19 to rotate, so as to drive the screening mechanism to rotate and utilize the centrifugal force to convey the materials which are not screened to the annular screening frame 29;

[0106] S6: The lifting driving assembly 2 is operated to drive the screening mechanism to ascend, so that the position of the first discharging port 30 is matched with the second discharging port 26, thereby guiding the materials which are not screened out of the device, and the materials are collected by the collecting box 8;

[0107] S7: The first driving motor 31 is continuously operated to drive the mixing arm 20 to mix and process the materials;

[0108] S8: After the mixing is completed, the second driving motor 38 is operated to unblock the discharge port 34, and the materials are discharged from the discharge port 34.

[0109] ​The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A mixing machine for preventing the diffusion of dust in the production of chemical fertilizers, characterized in that, The device body (1) is provided with a mixing mechanism, the top of the device body (1) is provided with a screening mechanism, and the screening mechanism comprises: An annular top seat (24) is fixed to the top of the device body (1); An annular lifting seat (11) is slidably connected to the inner wall of the annular top seat (24); An annular sieve frame (29) is rotatably installed in the annular sliding groove of the annular lifting seat (11); An annular sieve plate (21) is fixed to the inner side of the annular sieve frame (29), and the annular sieve plate (21) and the annular sieve frame (29) are concentrically arranged, the height of the annular sieve plate (21) is higher than the height of the bottom surface of the annular sieve frame (29), and the inner side of the annular sieve frame (29) smoothly transitions to the annular sieve plate (21); A sieve disc (28) is connected with the annular sieve plate (21) between the circumferential outer wall of the sieve disc (28) and the annular sieve plate (21) through an annular elastic connecting part (16); The mixing mechanism comprises: A center cylinder (12) is provided with uniformly distributed arc-shaped columns (33) at the bottom, the bottom end of the arc-shaped column (33) is fixed to the inner wall of the bottom of the device body (1), the bottom of the device body (1) is provided with a discharge port, the arc-shaped columns (33) are distributed on the circumferential outer side of the top of the discharge port, a strip-shaped port (36) is arranged between adjacent arc-shaped columns (33), and the inside of the device body (1) is communicated with the discharge port through the strip-shaped port (36); A plugging assembly is installed in the center cylinder (12) and used for controlling the opening and closing of the discharge port (34) at the bottom of the device body (1); A mixing assembly is rotatably installed on the center cylinder (12); A driving assembly is used for driving the rotation of the mixing assembly; The mixing assembly comprises: a rotating frame (32) rotatably installed on the center cylinder (12); a stirring frame (19) fixed to the end of the rotating frame (32); and a mixing arm (20) installed on the bottom outer wall of the stirring frame (19); The top of the device body (1) is provided with a lifting driving assembly (2), the lifting driving assembly (2) comprises an electric telescopic cylinder (14) fixed to the device body (1), and the output end of the electric telescopic cylinder (14) is fixed with a connecting plate fixed to the annular lifting seat (11); The bottom of the sieve disc (28) is fixed with an arc-shaped cover (27), the arc-shaped cover (27) is located directly above the center cylinder (12), and the top of the center cylinder (12) is in an arc surface structure matched with the arc-shaped cover (27); The sieve disc (28) is fixed with a side support (22); the bottom of the annular sieve plate (21) is fixed with a vertical rod, the end of the side support (22) is fixed with a vertical pipe sleeve (23) slidably connected to the outer wall of the vertical rod, and the bottom end of the vertical pipe sleeve (23) is provided with an inclined pipe sleeve (25); the positions of the vertical pipe sleeve (23) and the inclined pipe sleeve (25) are matched with the stirring frame (19); The junction of the annular screen frame (29) and the annular screen plate (21) is provided with vertically distributed stand plates (15) in uniform circumferential distribution, and the gap between two adjacent stand plates (15) is greater than the gap of the screen holes of the screen disc (28), the annular screen plate (21) and the annular screen frame (29).

2. The mixing machine for preventing the diffusion of dust during the production of chemical fertilizers according to claim 1, wherein The driving assembly comprises: A first driving motor (31) is mounted on one side of the outer wall of the central cylinder (12) through a support; A driving gear (18) is mounted on the output end of the first driving motor (31), and the circumferential outer wall of the rotating frame (32) is provided with uniformly distributed convex teeth (13), and the driving gear (18) is engaged with the convex teeth (13).

3. The mixing machine for preventing the diffusion of dust in the preparation of chemical fertilizers according to claim 2, characterized in that, The annular lifting seat (11) and the annular chute and the circumferential side of the annular screen frame (29) are provided with a first discharge port (30) matched thereon; and the circumferential outer wall of the annular top seat (24) is provided with a second discharge port (26); When the positions of the vertical pipe sleeve (23) and the inclined pipe sleeve (25) are matched with the top of the shifting frame (19), the second discharge port (26) is located above the first discharge port (30); and the height of the inner wall of the bottom surface of the annular screen frame (29) gradually decreases in the direction away from the center.

4. The mixing machine for preventing the diffusion of dust during the production of chemical fertilizers according to claim 3, wherein The outer side of the annular top seat (24) is fixedly provided with an annular feeding groove (17), the annular feeding groove (17) is located below the second discharge port (26), one side of the annular feeding groove (17) is communicated with a collecting box (8) through a discharge channel (7), and the heights of the annular feeding groove (17) and the discharge channel (7) gradually decrease in the direction close to the collecting box (8).

5. The mixing machine for preventing the diffusion of dust in the production of chemical fertilizers according to claim 4, characterized in that, The top of the annular lifting seat (11) is detachably provided with a top cover (3), the top cover (3) is provided with a feeding channel (4), the feeding channel (4) is provided in a Z-shaped structure, the top of the annular top seat (24) is provided with an annular support (5) through a support, the outer side of the annular support (5) is provided with first blocking curtains (6) in uniform circumferential distribution, and the first blocking curtains (6) are located outside the second discharge port (26).

6. The mixing machine for preventing the diffusion of dust in the production of chemical fertilizers according to claim 5, characterized in that, The blocking assembly comprises: A second driving motor (38) is mounted on the inner wall of the central cylinder (12) through a support; A screw rod (37) is in transmission connection with the output end of the second driving motor (38) at one end; A screw cylinder (39) is threadedly connected to the outer wall of the screw rod (37); A blocking plug (35) is slidably connected to the inner side of the annular structure formed by the arc-shaped columns (33) in an upper and lower manner, the inner diameter of the annular structure is matched with the inner diameter of the discharge port (34), the circumferential outer wall of the blocking plug (35) is provided with an arc-shaped sliding block (40), and the arc-shaped sliding block (40) is slidably connected to the strip-shaped port (36) in an upper and lower manner. The bottom of the device body (1) is provided with second blocking curtains (10) in uniform circumferential distribution, the second blocking curtains (10) are located outside the discharge port (34), and a receiving box (9) is arranged below the discharge port (34).

7. The mixing machine for preventing the diffusion of dust in the production of chemical fertilizers according to claim 6, characterized in that, The use method of the mixing machine comprises the following steps: S1: feeding materials into the inner side of the annular lifting seat (11) through the feeding channel (4); S2: The lifting driving assembly (2) works to drive the screening mechanism to descend, so that the position of the inclined pipe sleeve (25) is adapted to the top of the poking frame (19); S3: The first driving motor (31) works to drive the poking frame (19) to rotate, so that the inclined pipe sleeve (25) is intermittently hit, the screening mechanism is vibrated, and the screening is accelerated; S4: The lifting driving assembly (2) works to drive the screening mechanism to descend, so that the position of the vertical pipe sleeve (23) is adapted to the top of the poking frame (19); S5: The first driving motor (31) works to drive the poking frame (19) to rotate, so that the vertical pipe sleeve (23) is poked to drive the screening mechanism to rotate, and the centrifugal force is utilized to transport the un-screened material into the annular screen frame (29); S6: The lifting driving assembly (2) works to drive the screening mechanism to ascend, so that the position of the first discharge port (30) is adapted to the second discharge port (26), so that the un-screened material is guided out and collected by the collecting box (8); S7: The first driving motor (31) continues to work to drive the mixing arm (20) to mix the materials; S8: After the mixing is completed, the second driving motor (38) works to unblock the discharge port (34), and the material is discharged from the discharge port (34).

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