CN214106831U

CN214106831U - Built-in material returning pipe and internal material returning system

Info

Publication number: CN214106831U
Application number: CN202022870314.0U
Authority: CN
Inventors: 刘龙; 敖富宽; 高正岩; 米起民
Original assignee: Hohhot Deyuan Fertilizer Co ltd; Inner Mongolia Deyuan Fertilizer Co ltd
Current assignee: Hohhot Deyuan Fertilizer Co ltd; Inner Mongolia Deyuan Fertilizer Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-09-03
Anticipated expiration: 2030-12-07

Abstract

The utility model relates to a built-in return pipe, which is arranged between the drying section and the tail of a guniting granulator barrel and comprises an inner return pipe inlet, an inner return pipe and an inner return pipe outlet; the inner material return pipe penetrates through a grading slope surface of a grading cone arranged between a drying section and a tail of the guniting granulator cylinder, the inner material return pipe is arranged along the inner wall of the guniting granulator cylinder in an internal spiral mode, an inlet of the inner material return pipe is arranged on the inner wall of a cavity formed by the tail and the grading cone in a surrounding mode, and an outlet of the inner material return pipe is arranged in the drying section; the grading cone comprises a cone body and a guide cylinder, the cone body is a hollow cylinder body with two open ends and smooth inner wall, the guide cylinder is communicated with the small-diameter open end of the cone body, and a grading cone screen is arranged on the grading slope surface of the cone body. The utility model also provides an interior returning charge system. The utility model discloses not only energy-conservation can avoid large granule fertilizer to relapse the granulation moreover, worsens the solubility ability of fertilizer.

Description

Built-in material returning pipe and internal material returning system

Technical Field

The utility model relates to compound fertilizer production equipment, concretely relates to built-in return material pipe and interior return material system.

Background

The spraying granulator is an essential device in the production process of the compound fertilizer. The principle of guniting granulation is as follows: the small-particle fertilizer and feed liquid (such as antibiotic bacteria slag liquid and bacteria liquid) to be dried and granulated enter the granulator from the head (machine head) of the granulator, the bacteria liquid is quickly attached to the outer layer of the small-particle fertilizer under the action of hot air entering from the side face of the machine head, the material is quickly lifted by using a shoveling plate on the inner wall of the granulator and moves to the tail (machine tail) of the granulator, and the fertilizer particles become larger to form fertilizer particles with uniform particles and meeting the requirements on size.

In the process of fertilizer molding and granulation, fertilizer particles with unqualified sizes can be formed, and smaller particles and larger particles need to return to a machine head for spraying and granulation again. Generally, a cone-shaped grading cone is arranged between a drying section and a tail of the granulator, the section with a large caliber is connected with the drying section of the granulator, and one end with a small caliber is connected with the tail. Because the granulator drum is installed at a certain inclination angle, and the head is higher than the tail, when particles enter the grading cone from the tail of the drying section, because large-particle-size materials and small-particle-size materials have different natural stacking angles, the small particles sink to the bottom in the rotation process of the granulator drum, enter the built-in return pipe (or an internal return spiral pipe) installed at the bottom of the conical surface of the grading cone by a tangent line, return to the head for spraying granulation again, and oversized particle materials enter the screen to be screened, crushed and then return to the head from an external return system for spraying granulation again.

Present grading awl designs for conical surface smooth structure usually, return pipe entry direct opening including conical surface bottom installation, therefore, the material granule that leads to qualified size and large-size material granule easily also can enter into the return pipe, thereby lead to final fertilizer granule size to grow up, and the drying of spouting repeatedly leads to the inside coking of final fertilizer granule, large granule fertilizer still agglomerates at the middle part drying section of granulator cylinder easily, finally, the material of shut down clearance caking, the normal production of spouting the granulation has been influenced.

In addition, an external material returning system is arranged to return to the machine head for re-spraying granulation, materials need to be screened and crushed in advance and then lifted to the machine head for feeding by an external lifting system, material dust is caused, energy consumption is increased, and the production cost of spraying granulation is increased.

Therefore, the scientific and reasonable design of the material returning system of the guniting granulator has very important significance for reducing the production cost of the guniting granulator and ensuring the fertilizer performance to reach the standard.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a built-in returning charge pipe and interior returning charge system to prior art's defect and not enough, satisfy the reduction in production cost of compound fertilizer production, eliminate the dust pollution purpose that outer returning charge system brought.

In order to achieve the purpose, the utility model provides a built-in return pipe which is arranged between the drying section and the tail of the barrel of the guniting granulator and comprises an inner return pipe inlet, an inner return pipe and an inner return pipe outlet;

the inner material return pipe penetrates through a grading slope surface of a grading cone arranged between a drying section and a tail of the guniting granulator cylinder, the inner material return pipe is arranged along the inner wall of the guniting granulator cylinder in an internal spiral mode, an inlet of the inner material return pipe is arranged on the inner wall of a cavity formed by the tail and the grading cone in a surrounding mode, and an outlet of the inner material return pipe is arranged in the drying section;

the grading cone comprises a cone body and a guide cylinder, the cone body is a hollow cylinder body with two open ends and smooth inner wall, the guide cylinder is communicated with the small-diameter open end of the cone body, and a grading cone screen is arranged on the grading slope surface of the cone body.

According to an aspect of the utility model, interior returning charge pipe passes hierarchical awl screen cloth.

According to the utility model discloses an aspect, be provided with in the granulator barrel and follow the granulator tail extends to the interior returning charge spiral pipe of granulator aircraft nose, interior returning charge pipe export with interior returning charge spiral pipe intercommunication.

According to the utility model discloses an aspect, interior returning charge spiral pipe entry end sets up between the dry section of granulator barrel and the tail section, interior returning charge pipe export with interior returning charge spiral pipe entry end intercommunication, interior returning charge spiral pipe entry end set up with the screen cloth that hierarchical awl screen cloth aperture is unanimous.

According to one aspect of the invention, the mesh diameter of the classifying conical screen is determined according to the granulation diameter of the guniting granulator, preferably 0.6-0.9 times the granulation diameter, more preferably 0.8 times the granulation diameter.

According to the utility model discloses an aspect, hierarchical awl screen cloth with cone integrated into one piece, hierarchical awl screen cloth does hierarchical domatic upper distribution hole is constituteed.

According to an aspect of the utility model, the classifying cone screen cloth with cone integrated into one piece, the classifying cone screen cloth is the trapezoidal screen ring of width 10cm-50 cm.

According to the utility model discloses an aspect, the grading awl screen cloth with the cone components of a whole that can function independently shaping, the grading awl screen cloth is width 10cm-50 cm's trapezoidal sieve ring, trapezoidal sieve ring is fixed through welding or buckle the grading of cone is domatic.

According to an aspect of the utility model, trapezoidal sieve ring sets up the inner wall of cone is close to the minor diameter open end of cone.

According to an aspect of the utility model, trapezoidal sieve ring sets up the inner wall of cone is close to the major diameter open end of cone.

According to an aspect of the utility model, trapezoidal sieve ring sets up the inner wall central authorities of cone.

According to the utility model discloses an aspect, trapezoidal screen ring sets up to the divided multistage, and the centre sets up hierarchical domatic light ring.

According to an aspect of the utility model, the draft tube with cone joint position sets up annular retaining ring, the draft tube be with the cavity barrel of cone symmetry or the straight section of thick bamboo of asymmetric cavity.

According to an aspect of the invention, at least one vibration device is arranged on the outer wall surface of the cone.

According to an aspect of the invention, the vibrating device is arranged near the classifying cone screen.

According to an aspect of the utility model, vibrating device sets up on the outer wall of the cone that hierarchical domatic light ring corresponds.

According to an aspect of the invention, the vibrating device is a vibrating hammer, an air hammer or a chain.

According to an aspect of the utility model, the vibration hammer is an arc-shaped round pipe with one closed end, and an iron ball body is arranged in the vibration hammer.

According to an aspect of the utility model, set up on the water conservancy diversion section of thick bamboo wall with the mesh diameter unanimous of hierarchical awl screen cloth mesh.

According to an aspect of the utility model, interior returning charge pipe passes hierarchical domatic light ring.

The utility model also provides a built-in returning charge system installs on the internal inner wall of whitewashing granulator barrel, including above-mentioned built-in returning charge pipe, interior returning charge spiral pipe and hierarchical awl.

According to the utility model discloses an aspect, the interior material returning spiral pipe export setting of interior material returning spiral pipe is in on the aircraft nose inner wall of whitewashing granulator barrel.

According to an aspect of the utility model, the interior returning charge spiral pipe entry of interior returning charge spiral pipe sets up the major diameter open end of the cone of hierarchical awl.

Compared with the prior art, the utility model, following beneficial effect has:

1) the utility model discloses, when fertilizer granule moves to the position of grading awl screen cloth from the granulator aircraft nose, on the one hand through rotatory, the natural screening effect between the big granule carries out big granule and small granule separation, the tiny particle gathers to the grading awl screen cloth of bottom, on the other hand, the tiny particle falls out from the grading awl screen cloth mesh, get into built-in return tube, along with the rotation of granulator barrel, tiny particle fertilizer is transported to interior return tube by the built-in return tube of spiral setting, and directly return to the aircraft nose through interior return tube and granulate again, grading awl screen cloth has played the effect of screening fertilizer at the granulator tail, both increased tiny particle return volume, alleviateed fertilizer granule come out from the aircraft tail and get into the handling capacity of follow-up screening plant, the screen cloth that interior return tube entry end set up has still avoided large granule fertilizer to return to the aircraft nose through the interior return tube that sets up in the grading awl bottom, therefore, oversized granular fertilizer is generated, the dissolving performance of the fertilizer is deteriorated, meanwhile, the handling capacity of an outer material returning system for returning fertilizer granules from the tail to enter a subsequent screening device and then crushing the fertilizer granules is reduced due to the fact that the inner material returning system returns the fertilizer granules, on one hand, the field working environment can be improved, dust is reduced, on the other hand, energy consumption caused by opening the outer material returning system can also be reduced, and the energy-saving effect is obvious.

2) The utility model discloses, set up vibrating device on hierarchical awl outer wall, can eliminate hierarchical awl screen mesh and probably blockked up by the suitable fertilizer granule of particle diameter to reduce the hidden danger of hierarchical screening effect. For example, when the vibrating device rotates to the top end or is close to the top end along with the grading cone, the ball in the vibrating hammer naturally falls down and is knocked on the outer wall of the grading cone, and the knocking effect is formed on the screen mesh, so that particles blocked in the mesh are shaken out. In the chain type vibration device, the reciprocating knocking to the screen is periodically formed along with the periodic rotation of the grading cone, and the particles blocked in the mesh holes are knocked out. In the case of a pneumatic hammer, the screen is periodically hammered to shake out particles that have become lodged in the mesh.

3) The utility model discloses, draft tube and cone combination position set up annular retaining ring, can play and stop not in time sieve, not sneak into the draft tube from the tiny particle fertilizer of returning charge spiral pipe in hierarchical awl screen cloth gets into.

4) The utility model discloses, the draft tube sets up to the cavity barrel with the cone symmetry, can accelerate the overflow rate of finished product fertilizer, avoids fertilizer to pile up at the tail, and production efficiency is high.

5) The utility model discloses, the trapezoidal screen ring of grading awl screen cloth sets up the multistage of separation, the centre sets up hierarchical domatic light ring, be convenient for set up many places vibrating device on the grading awl outer wall, in time strike on the one hand and eliminate the jam of granule to grading awl screen cloth mesh, keep the smooth of grading awl screen cloth, sieve effectually, on the other hand can utilize the domatic inclination of hierarchical domatic light ring to have the screening effect to granular fertilizer itself, let granular fertilizer gather to the bottom fast, thereby sieve smoothly from the grading awl screen cloth of neighbouring.

6) The utility model discloses, set up on the water conservancy diversion section of thick bamboo wall with the mesh that hierarchical awl screen cloth mesh diameter is unanimous also can play the effect of further screening to the fertilizer granule, can reduce unqualified fertilizer granule and sneak into the chance that gets into the tail to alleviate the fertilizer granule and come out from the tail and get into follow-up screening plant handling capacity.

7) The utility model discloses, adopt compressed air whitewashing atomizing material feeding to replace the steam atomizing material feeding of traditional whitewashing granulator, owing to adopt steam atomizing material feeding to increase the material water content, can lead to the system energy consumption to rise, increased material drying time under the same circumstances, lead to the returning charge number of times to reduce the solubility of fertilizer. And adopt compressed air whitewashing atomizing material feeding, the air is through the compression back, and air temperature risees to more than 80 ℃, and pressure exceeds 0.6Mpa, through the dewatering facility of compressor self-bring, compressed air water content greatly reduced to the problem of steam because of the higher final reduction fertilizer solubility of water content has been solved.

Drawings

FIG. 1 is a schematic view of a built-in slurry-spraying granulation device with a return pipe of the present invention;

fig. 2 is an expanded schematic view of a cylinder of a built-in material returning system of the present invention;

FIG. 3 is a schematic view of a stepped cone structure of the present invention;

FIG. 4 is a schematic view of another stepped cone structure of the present invention;

FIG. 5 is a schematic view of a third grading cone structure of the present invention;

FIG. 6 is a left side view of the stepped cone structure of FIG. 3;

FIG. 7 is a left side view of the stepped cone structure of FIG. 4;

fig. 8 is a left side view of the stepped cone structure of fig. 5.

In the figure:

a granulator cylinder 1; a feeding box 2; a discharging box 3; a grading cone 10; a draft tube 11; a vibrating device 12; an inner return spiral tube 13; a retainer ring 14; a material guide plate 15; a shovelling plate 16; an outer return material feeding pipe 17; an inner return pipe 19; a feed tank 21; a spray gun 22; a hot air inlet 23; a discharge box 31; a discharge bin outlet 33; a tail gas suction port 34; grading the slope 101; a through-hole 102; an annular retainer ring 103; a classifying cone screen 104; a graded slope aperture 105; a grading cone 106; a draft tube wall 111; an inner return spiral tube inlet 131; an internal return coil outlet 132; an inner return pipe outlet 133; an inner return pipe inlet 191; a stepped conical bore 192.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

Embodiment mode 1

Fig. 1 is a schematic view of a built-in return pipe guniting granulation apparatus of the present invention, fig. 2 is a schematic view of a barrel body of a built-in return pipe guniting granulation system of the present embodiment, fig. 3 is a schematic view of a grading cone structure according to the present embodiment, and fig. 6 is a left side view of the grading cone structure of the present embodiment.

Built-in material return pipe, internal material return system and guniting granulation device structure

As shown in fig. 1, the internal return pipe 19 and the internal return system including the internal return pipe 19 are disposed inside the drum 1 of the guniting granulator. The guniting granulator comprises a guniting granulator barrel 1, a feeding box 2 positioned at the head and a discharging box 3 positioned at the tail. A grading cone 10 is arranged between the drying section and the tail of the cylinder 1 of the guniting granulator, an inner material return spiral pipe 13 is arranged at the drying section of the cylinder 1 of the guniting granulator, a check ring 14 is arranged at the middle section of the drying section of the cylinder 1 of the guniting granulator, a material guide plate 15 is arranged inside the head of the guniting granulator, and a shoveling plate 16 is arranged at the drying section of the cylinder 1 of the guniting granulator.

As shown in fig. 1, the feeding box 2 is a disc-shaped feeding box 21, which is sleeved on the head of the guniting granulator cylinder 1, a hot air inlet 23 is arranged below the feeding box 21, which can convey hot air for drying materials into the guniting granulator cylinder 1, an external material returning feeding pipe 17 is arranged above the feeding box 21, and can convey screened granular materials to be re-granulated, which are collected by an external material returning system, into the guniting granulator cylinder 1. The spray gun 22 enters the head of the cylinder 1 of the direct-connection spraying granulator from the center of the left side of the feeding box 21, and fertilizer slurry to be granulated is atomized and sprayed into the head of the cylinder 1 of the spraying granulator through compressed air arranged on a pipeline of the spray gun 22.

As shown in fig. 1, the discharging box 3 at the tail is a disc-shaped discharging box 31, which is sleeved at the tail of the barrel 1 of the guniting granulator, a discharging box outlet 33 is arranged below the discharging box 31 for discharging fertilizer granules for granulation, and a tail gas suction port 34 is arranged above the discharging box 31 for sucking waste gas generated in the drying process of the granulator.

As shown in fig. 3, the classifying cone 10 is a hollow cylinder with two open ends and smooth inner wall. The grading cone 10 comprises a cone 106 and a guide shell 11, wherein the cone 106 is a hollow cylinder with two open ends and smooth inner wall, and the guide shell 11 is communicated with the small-diameter open end of the cone 106. The guide cylinder 11 passes through the tail of the cylinder body 1 of the guniting granulator and is communicated with the discharging box 3.

As shown in fig. 1, the classifying cone 10 and the inner wall of the tail cylinder of the guniting granulator cylinder 1 enclose to form a cavity, and the inlet of the inner return pipe 19 is arranged on the inner wall of the cavity, preferably on the end side wall of the cavity of the tail. The inner return pipe 19 passes through the grading cone 10 and is communicated with the inlet end of the inner return spiral pipe 13. The inner return pipe 19 is arranged on the inner wall of the tail of the guniting granulator cylinder 1 in a spiral mode.

Fig. 2 is an expanded view of the guniting granulator barrel 1 of the built-in material returning system. As shown in figure 2, an inner return pipe 19 is arranged on the inner wall of the tail of a cylinder body 1 of a guniting granulator in an internal spiral mode, an inlet 191 of the inner return pipe is arranged in a cavity of the tail, the inner return pipe 19 penetrates through a grading conical surface perforation 192 on a grading slope surface 101 of a grading cone 10 and then is communicated with an inlet end of an inner return pipe 13, a grading cone screen 104 is arranged on the grading slope surface 101 of the grading cone 10, an annular check ring 103 is arranged at the joint of a cone body 106 of the grading cone 10 and a guide cylinder 11, the grading cone 10 is communicated with the guide cylinder 11 through a through hole 102, a vibrating device 12 is arranged on the outer wall surface of the grading slope surface 101 of the grading cone 10, the inner return pipe 13 is arranged on the inner wall of the cylinder body 1 of the guniting granulator in an internal spiral mode, small-particle materials at the tail are collected from the inlet 131 of the inner return pipe, returned to the machine head and flow out from the outlet 132 of the inner return pipe for granulation again, and are granulated again through the inner return pipe 19, The combination of the grading cone 10 and the internal return spiral pipe 13 forms an internal return system, and the processes of material screening, unqualified small-particle material collection and internal return re-granulation in the granulation process are completed. Because all the inner material returning systems are arranged in the barrel body 1 of the guniting granulator, the quantity of the outer material returning can be greatly reduced, the working load of the outer material returning system is greatly reduced, and the problems of high dust and high energy consumption caused by the outer material returning are solved.

As shown in fig. 3, an annular retaining ring 103 is disposed at a joint of the guide shell 11 and the cone 106, and the guide shell 11 and the cone 106 are hollow cylinders asymmetric with respect to the annular retaining ring 103. In this embodiment, a plurality of vibration hammer vibration devices 12 are symmetrically disposed on the outer wall surface of the cone 106, each vibration hammer is an arc-shaped circular tube with one closed end and contains an iron ball body, and the arc-shaped circular tube is welded to the outer wall surface of the cone 106. In the present embodiment, the vibrohammer vibration device 12 is provided on the outer wall surface of the graded slope diaphragm 105.

As shown in fig. 6, four divided classifying cone screens 104 are uniformly and symmetrically arranged on the classifying slope surface 101 of the classifying cone 10, the classifying cone screens 104 are trapezoidal screens with the width of 50cm, and the classifying slope surface aperture 105 is arranged in the middle of the trapezoidal screens. Wherein, each section of grading cone screen cloth 104 extends from the grading slope 101 near the small diameter opening end of the cone 106 to the large diameter opening end of the cone 106, the grading cone screen cloth 104 has meshes for the small-size material particles to fall out, the diameter of the meshes is determined according to the granulation diameter of the guniting granulator, and in the embodiment, the diameter of the meshes is 0.8 times of the granulation diameter. In this embodiment, the classifying cone screen 104 is integrally formed with the classifying slope 101 of the classifying cone 10, that is, the classifying cone screen 104 is formed by directly drilling the classifying slope 101. The grading slope 101 is provided with grading conical perforation 192 for the inner return pipe 19 to pass through.

As shown in figure 3, when the grading cone 10 rotates along with the granulator, the ball body with the built-in iron balls in the vibrating device 12 which rotates to the highest point falls down under the action of gravity, the outer wall surface of the grading slope diaphragm 105 is knocked, and the vibration formed by knocking forms impact on the grading cone screen 104, so that material particles clamped on the meshes of the grading cone screen 104 can be removed through the impact formed by vibration, small-particle materials fall out of the grading cone screen 104, and the materials entering the tail of the granulator return to the head through the return pipe for re-granulation. Adopt the utility model discloses a hierarchical awl screen cloth 104 structure that multistage distributes can set up a plurality of vibrohammers vibrating device 12 on hierarchical domatic light ring 105's outer wall, strikes hierarchical domatic light ring 105's outer wall rather than directly strike hierarchical awl screen cloth 104 because of the vibration, can avoid leading to hierarchical awl screen cloth 104 to warp because of directly striking for a long time.

Working principle of guniting granulation device with built-in return pipe and built-in return system

As shown in fig. 1, a guniting granulator cylinder 1 with a middle drying section diameter of 4.25 meters and a length of 16 meters rotates under the action of an external gear traditional system (not shown in fig. 1), the rotating speed is 6 circles per minute, and the inclination angle of the guniting granulator cylinder and the horizontal plane is 3 degrees. Spraying atomized fertilizer slurry containing bacterial residues into a guniting granulator from a spray gun 22 arranged at the head of a barrel 1 of the guniting granulator, feeding 650-degree hot air into the head from a hot air inlet 23 arranged below a feeding box body 21 at the head of the barrel 1 of the guniting granulator, drying the fertilizer slurry through a hot air distribution plate (not shown in figure 1) in the feeding box body 21, wherein during the process that dried material particles move from the head to the tail in the rotating guniting granulator barrel 1, on one hand, new fertilizer is continuously absorbed and gradually grows, on the other hand, under the action of a shoveling plate 16 in the barrel 1 of the guniting granulator, a material curtain is formed by shoveling, the dried fertilizer particles enter a grading cone 10 at the tail, and when meshes of a grading cone screen 104 are arranged on a grading slope 101 of the grading cone 10, small particles fall out of the grading cone 10 and enter a cavity at the tail, and then the fertilizer is returned to the inlet 131 of the inner return spiral pipe through the outlet 133 of the inner return pipe after passing through the inlet 191 of the inner return pipe 19 arranged on the inner wall of the cavity, the returned fertilizer particles are returned to the machine head for re-granulation by the inner return spiral pipe 13 under the rotation of the cylinder body 1 of the guniting granulator, thereby completing the inner circulation of guniting granulation, namely small granular fertilizer is screened and separated from the grading cone 10 at the tail of the machine, and then the small granular fertilizer is returned to the machine head again through the inner return pipe and the inner return spiral pipe for continuous granulation.

In this embodiment, because of the design of the grading cone containing the grading cone screen cloth 104, the internal material returning spiral pipe 13, the internal material returning system of the internal material returning pipe 19 of the internal material returning spiral pipe 13 communicating the tail and the drying section, therefore, the tail automatic screening of the small-particle fertilizer is established in the spraying granulator barrel 1, the separation, the granulation internal circulation of the small-particle material from the internal automatic material returning to the head, the spiral arrangement of the internal material returning pipe 19 and the internal material returning spiral pipe 13 in the granulation internal circulation utilization, under the condition of not adding an external power facility, the effect of the external circulation material returning of the tail of the traditional granulator is realized, in addition, the large-particle material screening and crushing and external material returning material lifting operation are reduced, and the environment-friendly and energy-saving effects are achieved.

In the present embodiment, the external feed return pipe 17 is disposed offset from the spray gun 22, preferably, the head of the spray gun 22 is located on the central axis of the barrel at the head of the pelletizer 1, the head of the external feed return pipe 17 is disposed near the inner wall of the barrel at the head of the pelletizer 1, and the head of the spray gun 22 is closer to the head of the pelletizer 1 than the head of the external feed return pipe 17. By the design, atomized slurry sprayed from the head of the spray gun 22 can be fully absorbed by a material curtain entering the head of the granulator 1 from the outer material return feeding pipe 17, and micro-particles of organic fertilizer are quickly formed, so that granulation of the head is completed.

Embodiment mode 2

Fig. 4 is a schematic view of a stepped cone structure according to embodiment 2 of the present invention, and fig. 7 is a left side view of the stepped cone structure in fig. 4. Compared with the embodiment 1, the built-in material returning pipe, the built-in material returning system and the guniting granulation device of the embodiment are different in the adopted grading cone structure.

As shown in fig. 4, the classifying cone 10 is a hollow cylinder with two open ends and smooth inner wall. The grading cone 10 is arranged between the drying section and the tail of the granulator, the grading cone 10 comprises a cone 106 and a guide cylinder 11, the cone 106 is a hollow cylinder with two open ends and smooth inner wall, and the guide cylinder 11 is communicated with the small-diameter open end of the cone 106. An annular retainer ring 103 is arranged at the joint of the guide shell 11 and the cone 106, and the guide shell 11 and the cone 106 are hollow cylinders symmetrically arranged relative to the annular retainer ring 103.

As shown in fig. 7, a grading cone screen 104 is disposed on the grading slope 101 of the grading cone 10, the grading cone screen 104 is close to the small-diameter opening end of the cone 106, meshes for dropping out small-sized material particles are distributed on the grading cone screen 104, the diameter of the meshes is determined according to the granulation diameter of the guniting granulator, and in the present embodiment, the diameter of the meshes is 0.9 times of the granulation diameter. In this embodiment, the classifying cone screen cloth 104 and the cone 10 are integrally formed, the classifying cone screen cloth 104 is composed of distributed holes on the classifying slope surface 101, in the manufacturing process, the integrally formed classifying cone 10 is firstly processed and manufactured, then, holes are drilled on the classifying slope surface 101 of the classifying cone 10 close to the small-diameter opening end of the cone 106 and are uniformly distributed on the classifying slope surface 101, so as to form the classifying cone screen cloth 104. The drill holes may also be evenly distributed over the entire grading ramp 101, if desired, so that the grading ramp 101 is also a grading cone screen 104. The grading slope 101 is provided with grading conical perforation 192 for the inner return pipe 19 to pass through.

As shown in FIG. 4, two chain type vibration devices 12 are symmetrically arranged on the outer wall surface of a cone 106, the vibration devices 12 are arranged on a grading cone screen cloth 104, when a grading cone 10 rotates along with a granulator, the two chain type vibration devices 12 fall under the action of gravity and hit the grading cone screen cloth 104 under the action of inertia swing, so that material particles blocked on the meshes of the grading cone screen cloth 104 can be removed through hitting, small-particle materials fall out of the grading cone screen cloth 104, and the materials entering the tail of the granulator return to the head through an inner return pipe 19 for re-granulation.

In this embodiment, the material forms material granule not of uniform size after passing through the granulator granulation, get into the hierarchical awl 10 of granulator tail, along with the granulator is rotatory, the material granule is because of the different natural layering of particle size, the material of small granule is sieved and is fallen into on hierarchical domatic 101 of hierarchical awl 10, after being sieved by the mesh of hierarchical awl screen cloth 104, fall out hierarchical awl 10 and get into interior return pipe 19 and directly return to the aircraft nose, material and the material of large granule that accord with particle size, go into draft tube 11 behind the cone 106 through hierarchical awl 10 and the annular retaining ring 103 that draft tube 11 combination position set up, get into subsequent material packing, thereby realized the classification of the unqualified material after the guniting granulator is dry.

Owing to set up hierarchical awl screen cloth 104, played the effect to fertilizer screening at the granulator tail, both increased the return material volume of tiny granule, alleviate the fertilizer granule again and come out the handling capacity that gets into follow-up screening plant from the tail, interior return material spiral pipe entry end sets up the screen cloth unanimous with hierarchical awl screen cloth aperture, still avoided in hierarchical awl bottom direct set up traditional open type in return material spiral return material, large granule fertilizer returns the aircraft nose through the return material spiral that sets up in hierarchical awl bottom, thereby lead to super large granule fertilizer to generate, the condition of the solubility property of worsening fertilizer takes place. In order to prevent the mesh of the screen mesh arranged at the inlet end of the internal material returning spiral pipe from being blocked and reduce the function of the internal material returning spiral, a knocking device similar to the vibrating device 12 arranged on the outer wall surface of the grading slope surface 101 of the grading cone 10 is arranged on the surface, opposite to the feeding direction, in the screen mesh, when a roller of the granulator rotates, the screen mesh is hit periodically, fertilizer particles adhered in the mesh are removed in time through vibration, and the smoothness of the filter mesh is ensured.

Embodiment 3

Fig. 5 is a schematic view of a stepped cone structure according to embodiment 3 of the present invention, and fig. 8 is a left side view of the stepped cone structure in fig. 5. Compared with the embodiment 1, the built-in material returning pipe, the built-in material returning system and the guniting granulation device of the embodiment are different in the adopted grading cone structure.

As shown in fig. 5, the classifying cone 10 is a hollow cylinder with two open ends and smooth inner wall. The grading cone 10 is arranged between the drying section and the tail of the granulator, the grading cone 10 comprises a cone 106 and a guide cylinder 11, the cone 106 is a hollow cylinder with two open ends and smooth inner wall, and the guide cylinder 11 is communicated with the small-diameter open end of the cone 106. An annular retainer ring 103 is arranged at the joint of the guide shell 11 and the cone 106, and the guide shell 11 and the cone 106 are hollow straight cylinders which are asymmetric relative to the annular retainer ring 103.

As shown in fig. 8, two separate classifying cone screens 104 are arranged on the classifying slope 101 of the classifying cone 10, the classifying cone screens 104 are trapezoidal screen rings with a width of 10cm, and a classifying slope aperture 105 is arranged in the middle of each trapezoidal screen ring. Wherein, one section of grading cone screen cloth 104 is close to the grading slope 101 of the small diameter opening end of the cone 106, the other section of grading cone screen cloth 104 is distributed on the central inner wall of the grading slope 101 of the cone 106, the grading cone screen cloth 104 is provided with meshes for the falling of small-size material particles, the diameter of the meshes is determined according to the granulation diameter of the guniting granulator, and in the embodiment, the diameter of the meshes is 0.8 times of the granulation diameter. The grading slope 101 is provided with grading conical perforation 192 for the inner return pipe 19 to pass through.

In this embodiment, the classifying cone screen cloth 104 may be integrally formed with the cone 10, the classifying cone screen cloth 104 is formed by distributing holes on the classifying slope surface 101, in the manufacturing process, the integrally formed classifying cone 10 is firstly processed and manufactured, and then the classifying slope surface 101 of the classifying cone 10 is drilled to form the classifying cone screen cloth 104 with uniformly distributed meshes. The classifying cone screen cloth 104 can also be formed separately from the cone 106, for example, the classifying cone screen cloth 104 is separately processed into a trapezoidal screen ring with a width of 10cm, and then fixed on the classifying slope surface 101 of the cone 10 by welding or fastening.

As shown in fig. 5, a plurality of chain-type vibration devices 12 are symmetrically provided on the outer wall surface of the cone 106, and in the present embodiment, a stepped slope diaphragm 105 is provided between two stepped screen rings, so that the chain-type vibration devices 12 can be fixed to the stepped slope diaphragm 105. Because the trapezoidal screen ring of hierarchical awl screen cloth 104 sets up the multistage for the separation, the centre sets up hierarchical domatic light ring 105, be convenient for set up many places vibrating device 12 on hierarchical awl 10 outer wall, in time strike on the one hand and eliminate the jam of granule to hierarchical awl screen cloth 104 mesh, keep the unobstructed of hierarchical awl screen cloth 104, screening effect is good, on the other hand can utilize the domatic inclination of hierarchical domatic light ring 105 to the screening effect that large granule fertilizer itself has to the tiny particle fertilizer, let the tiny particle fertilizer gather to the bottom layer fast, thereby sieve smoothly from the hierarchical awl screen cloth of neighbouring. Thereby, be favorable to material granulation grading separation, improve the screening effect in grades.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A built-in material returning pipe is arranged between a drying section and a tail of a cylinder body of a guniting granulator and comprises an inner material returning pipe inlet, an inner material returning pipe and an inner material returning pipe outlet;

2. The built-in return pipe according to claim 1, characterized in that the inner return pipe passes through a classifying cone screen of the cone.

3. The built-in material returning pipe according to claim 1 or 2, wherein an inner material returning spiral pipe extending from the tail of the granulator to the head of the granulator is arranged in the barrel of the granulator, and an outlet of the inner material returning spiral pipe is communicated with an inlet end of the inner material returning spiral pipe.

4. The built-in return pipe according to claim 1 or 2, characterized in that the mesh diameter of the classifying conical screen is determined according to the granulation diameter of a guniting granulator.

5. The built-in return pipe according to claim 4, characterized in that the grading cone screen has a mesh diameter of 0.6-0.9 times the granulation diameter.

6. The built-in return pipe according to claim 1 or 2, characterized in that the classifying cone screen is integrally formed with the cone, and the classifying cone screen is composed of distribution holes on the classifying slope surface.

7. The built-in return pipe according to claim 1 or 2, characterized in that the classifying cone screen mesh is integrally formed with the cone, and the classifying cone screen mesh is a trapezoidal screen ring with a width of 10cm-50 cm.

8. The built-in return pipe according to claim 1 or 2, characterized in that the classifying cone screen mesh and the cone are formed separately, the classifying cone screen mesh is a trapezoidal screen ring with a width of 10cm-50cm, and the trapezoidal screen ring is fixed on the classifying slope surface of the cone by welding or buckling.

9. The built-in return pipe according to claim 7, characterized in that the trapezoidal screen rings are arranged into separate segments, and a graded slope diaphragm is arranged in the middle.

10. A built-in material returning system is arranged on the inner wall of a barrel body of a guniting granulator and is characterized by comprising the built-in material returning pipe, an inner material returning spiral pipe and a grading cone in any one of claims 1 to 9, wherein an outlet of the inner material returning spiral pipe is arranged on the inner wall of a machine head of the barrel body of the guniting granulator, and an inlet of the inner material returning spiral pipe is arranged at a large-diameter opening end of the cone body of the grading cone.