CN116060175A - A pulverization system for ultrafine pulverization - Google Patents

Abstract

The invention belongs to the technical field of crushers, and particularly relates to a crushing system for superfine crushing, which comprises a superfine crushing mechanism, a separation screening mechanism, a dust removing mechanism and a high-pressure fan which are sequentially arranged; the feed inlet of the separation screening mechanism is connected with the feed outlet of the superfine grinding mechanism through a first feed conveying pipe, the feed return inlet of the separation screening mechanism is connected with the feed inlet of the superfine grinding mechanism through a feed return conveying pipe, the feed outlet of the separation screening mechanism is connected with the feed inlet of the dust removing mechanism through a second feed conveying pipe, and the air outlet of the dust removing mechanism is connected with the inlet of the high-pressure fan; the superfine grinding mechanism is used for grinding materials, the separation and screening mechanism is used for separating and screening the ground materials, wherein the materials with small particle sizes enter the dust removing mechanism from a discharge hole of the separation and screening mechanism, and the materials with large particle sizes enter the superfine grinding mechanism again from a feed back hole of the separation and screening mechanism; the high-pressure fan is used for providing negative pressure air suction for the crushing system.

Description

A pulverization system for ultrafine pulverization

technical field

The invention belongs to the technical field of pulverizers, in particular to a pulverization system for ultrafine pulverization.

Background technique

With the development of the domestic aquatic feed industry, in recent years, the industry has paid more attention to small particle extruded materials. Small particle extruded materials are mainly used as special seedling materials, and small particle extruded materials are used as high-end extruded materials. Related extruders and crushing The structure of the machine puts forward higher requirements, and the production of small particle extruded materials is not yet universal in the industry. Generally, after the primary crushing, the raw materials are mixed with attractants and oils, and then subjected to secondary superfine crushing, and then enter the extruder for puffing. If the fineness of the secondary superfine crushing is low, it is very easy to block the puffing Machine template holes.

Therefore, the production of small-particle extruded materials puts forward higher requirements for the crushing fineness of the crusher, which needs to be above 200 mesh, but the demand for crushing capacity is not too high. As far as the current situation is concerned, in the existing vertical shaft ultrafine pulverizer, the classification system and the pulverization system are integrated on one piece of equipment. This kind of integration will lead to high energy consumption and high material temperature when the pulverization is of high fineness. , large water loss and other defects. Specifically, the classification system of the existing vertical shaft ultrafine pulverizer is integrated into the main machine itself, and the materials in the crushing chamber are sucked into the classification area before they are effectively crushed. At the same time, if you need to obtain a fineness of more than 200 mesh, you need to increase energy input. The main motor needs to provide a higher speed for the vertical shaft, and the classifying motor needs to provide a higher speed for the classifying wheel. High temperature and large water loss also reduce the stability of the equipment.

Contents of the invention

In order to solve the problem that the pulverizers in the prior art cannot satisfy the production of small particle puffed materials, the present invention provides a pulverization system for ultrafine pulverization.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows, a pulverization system for ultrafine pulverization, including an ultrafine pulverization mechanism, a separation and screening mechanism, a dust removal mechanism and a high-pressure fan arranged in sequence; the separation and screening mechanism The feed inlet of the feed port is connected with the discharge port of the superfine pulverization mechanism through the first feeding pipe, and the feed inlet of the separation and screening mechanism is connected with the feed inlet of the superfine pulverization mechanism through the return conveying pipe, and the separation and screening mechanism The discharge port of the mechanism is connected to the feed port of the dedusting mechanism through the second feeding pipe, and the air outlet of the dedusting mechanism is connected to the inlet of the high-pressure fan; The pulverized materials are separated and screened, wherein the materials with small particle size enter the dust removal mechanism from the discharge port of the separation and screening mechanism, and the materials with large particle size enter the superfine pulverization mechanism from the return port of the separation and screening mechanism; The high-pressure fan is used to provide negative pressure suction for the crushing system.

Preferably, the separation and screening mechanism includes a screening cylinder and a first drive structure, the screening cylinder includes a feeding and returning section, an air supply section and a settling section connected in sequence from bottom to top, and the settling section is provided with a classification The first driving structure is used to drive the classification wheel to rotate, the discharge port of the separation and screening mechanism is located above the classification wheel, the air supplement section is provided with an air supplement port along the tangential direction of the flow, and the feed and return section It includes a feeding pipe and a feeding pipe, the inlet of the feeding pipe is connected with the air supply section, the outlet of the feeding pipe is the feeding port of the separation and screening mechanism, and the outlet of the feeding pipe is inserted into the feeding In the pipe, the outlet of the feed pipe is higher than the air supply section and is located below the classification wheel. The diameter of the feed pipe is smaller than the diameter of the air supply section. The inlet of the feed pipe is the separation and screening Mechanism inlet. The separation and screening mechanism integrates multiple and multiple screenings. The first screening is the falling velocity sedimentation separation, that is, the material suddenly enters the large diameter feed pipe to form the falling velocity sedimentation separation, and the secondary screening To adjust the screening for supplementary air, adjust the size of the supplementary air port, you can control the screening efficiency more precisely, separate the larger particles, and then directly return to the superfine pulverization mechanism through the return conveying pipe for re-crushing, and the third screening is grading Wheel screening, by adjusting the speed of the classifying wheel to further adjust the fineness of the finished product, the fine particle material after the first two separations reaches the screening area of the classifying wheel, the fineness of the material particles is already very high, so the classifying wheel only needs less energy consumption The desired fineness can be achieved with the speed and rotation speed. The combination of multiple screenings improves the screening efficiency, reduces the wear on the classifying wheel and improves the service life; the classifying wheel can be the existing classifying wheel, the classifying wheel The discharge part is consistent with the rising angle of the material, which is beneficial to reduce the discharge resistance, further improve the discharge efficiency, and reduce the energy loss of the overall system; the elevation angle design of the blades of the classifying wheel reduces the running resistance, the rotation of the classifying wheel is more stable, and the material is screened Higher efficiency; therefore, the finished particle size is finer, which can reach 200 mesh-1000 mesh.

Further, the first drive structure includes a first motor and a first belt drive, the first motor is arranged on the settling section, the driving wheel of the first belt drive is connected to the output end of the first motor, the The driven wheel of the first belt drive is connected with the grading wheel. The structure of the first driving structure is simple and reliable, the technology is mature, the transmission is stable, the control is convenient, and the cost is low.

Preferably, the ultra-fine pulverization mechanism includes a main base, a vertical shaft, a cutter head assembly and a second drive structure, a crushing chamber is arranged inside the main base, the vertical shaft is rotated and arranged in the grinding chamber, and the cutter head assembly set on the vertical shaft, the second drive structure is used to drive the vertical shaft to rotate, the inner wall of the crushing chamber is provided with a number of tooth plates, and several of the tooth plates are arranged in turn around the outer circumference of the cutter head assembly, and the tooth plates The gap with the cutter head assembly can be adjusted. The material enters the crushing chamber, and the cutter head assembly is driven by the second driving structure to rotate at high speed at the same time. The material is broken by the impact, shear and friction of the high-speed rotating cutter head assembly, and flies to the circumferential direction of the crushing chamber at a high speed. The tooth plate is further crushed by impact, shear, and friction, which improves the uniformity of the crushing fineness and ensures a more ideal crushing effect; adjusting the gap between the tooth plate and the cutter head assembly can meet different crushing fineness. Degree demand.

Preferably, the ultrafine pulverization mechanism further includes a frame, the main base is arranged on the frame, the main base includes an upper base and a lower base, the crushing chamber is arranged in the upper base, and the crushing chamber is The top is small and the bottom is large; the feed port of the superfine pulverization mechanism is set on the top of the upper base, and the discharge port of the superfine pulverization mechanism is opened on the lower base; or the feed inlet of the superfine pulverization mechanism The feed port is set on the lower base body, and the discharge port of the superfine pulverizing mechanism is set on the top of the upper base body. First of all, the setting of the feed port of the superfine pulverization mechanism and the discharge port of the superfine pulverization mechanism makes the overall material flow direction conform to the flow direction of the material's own gravity, and from top to bottom, it is more in line with the flow trend of the material from top to bottom , improve the discharge efficiency and reduce the overall energy consumption; and the crushing chamber and the cutter head have a certain taper shape, which can effectively change the running direction of the fluid and spread from top to bottom, effectively improving the crushing efficiency.

Further, the cutter head assembly includes a screed plate, a first layer of blades, an upper cutter head, a second layer of blades, a partition, a third layer of blades, a lower cutter head, a fourth layer of blades arranged in sequence from top to bottom. The blade and the cutter head seat, the screed plate and the cutter head seat are all fixedly sleeved on the vertical shaft. The material passes between the blades of each layer and the tooth plate, and is continuously broken under the impact of the high-speed rotating blades. Cutting, effectively guarantee the crushing quality of materials.

Further, the second drive structure includes a second motor and a second belt drive, the second motor is arranged on the frame, the driving wheel of the second belt drive is connected to the output end of the second motor, and the The driven wheel of the second belt transmission is connected with the vertical shaft. The structure of the second driving structure is simple and reliable, the technology is mature, the transmission is stable, the control is convenient, and the cost is low.

Further, the crushing system for ultra-fine crushing also includes a screw conveying auger, the feeding port of the screw conveying auger is provided with a bin to be crushed, a feeding port is arranged on the bin to be crushed, and the separation and screening mechanism The material return port of the feeder is connected to the bin to be crushed through the return material conveying pipe, and the discharge port of the screw conveying auger is connected to the feed port of the ultrafine pulverization mechanism. The setting of the feeding port, the bin to be crushed and the screw conveying auger is convenient for the material to be put into the crushing system for ultra-fine crushing; the coarse material with large particle size separated by the separation and screening mechanism can be returned to the bin to be crushed and passed through the screw The conveying auger is again input into the superfine pulverization mechanism for pulverization, forming a closed-loop process until pulverized into qualified products, effectively recovering coarse materials with large particle sizes and improving material utilization.

Preferably, the dust removal mechanism includes a cyclone dust collector, a pulse dust collector and a safety screen, the air outlet of the cyclone dust collector is connected to the feed port of the pulse dust collector, and the discharge port of the cyclone dust collector and the pulse dust collector The outlets of the cyclone dust collectors are all connected with safety screens, the outlets of the cyclone dust collector and the outlet of the pulse dust collector are all equipped with related air devices, and the inlet of the cyclone dust collector is the inlet of the dust removal mechanism. The material outlet, the air outlet of the pulse dust collector is the air outlet of the dust removal mechanism. After the material reaches the cyclone dust collector, it settles spirally, and enters the safety screen through the air locker under the cyclone dust collector. The subsequent pulse dust collector separates the dusty air, and the dust passes through the air locker under the pulse dust collector and enters the safety screen. , to ensure that clean air enters the follow-up high-pressure fan, and at the same time avoid the discharge of materials, improve the utilization rate of materials, and finally filter out unqualified products with a safety screen to ensure the fineness of qualified products.

Preferably, the high-pressure blower is provided with a muffler. Effectively reduce the noise of the crushing system for ultra-fine crushing.

Beneficial effect:

1. The pulverization system for ultrafine pulverization of the present invention, the separation and screening mechanism and the superfine pulverization mechanism are separately set up, which greatly reduces the residence time of materials inside the superfine pulverization mechanism, and solves the problem of the pulverization process of the existing superfine pulverizer. The problem of high material temperature in the process; reducing the temperature rise of the material can effectively reduce the moisture loss of the material, create favorable conditions for the subsequent granulation or puffing, improve the maturation effect of the material, and reduce the proportion of water addition;

2. The crushing system of the present invention for ultra-fine crushing has simple and reliable structure, ingenious design, clear principle, and adjustable crushing fineness, which can meet different crushing fineness requirements;

3. The pulverization system of the present invention is aimed at ultra-fine pulverization. The separation and screening mechanism integrates multiple and multiple screenings. The one-time screening is separated by falling speed and sedimentation, that is, the material suddenly enters the large-diameter feed pipe from the small-diameter feed pipe. The supplementary air section forms the falling speed sedimentation separation, and the secondary screening is the supplementary air adjustment and screening. Adjusting the size of the supplementary air port can control the screening efficiency more accurately, separate the larger particles, and then return them directly through the return conveying pipe. Go to the ultra-fine grinding mechanism for re-grinding, three times of screening for classification wheel screening, and further adjust the fineness of the finished product by adjusting the speed of the classification wheel. It is already very high, so the grading wheel can reach the desired fineness with only a small energy consumption and rotating speed, and can easily screen out the fineness of the finished product above the mesh. The combination of multiple screenings better improves the screening efficiency. At the same time, it reduces the wear on the classifying wheel and improves the service life;

4. In the pulverization system of the present invention aimed at ultrafine pulverization, the separation and screening mechanism separates larger particles, and then directly returns to the superfine pulverization mechanism through the return conveying pipe for further pulverization, forming a closed-loop pulverization cycle until Grinding into qualified products, effectively recovering coarse materials with large particle sizes, and improving material utilization;

5. The pulverization system of the present invention is aimed at ultrafine pulverization. The material enters the pulverization chamber, and at the same time, the material is broken by the impact, shear and friction of the high-speed rotating cutter head assembly, and flies to the circumference of the pulverization chamber at a relatively high speed. The tooth plates in the same direction are further crushed by impact, shear and friction, which improves the uniformity of the crushing fineness and ensures a more ideal crushing effect; the material flows from top to bottom in the crushing chamber, which conforms to the flow direction of the material's own gravity , and the crushing chamber and the cutter head have a certain taper shape, which can effectively change the running direction of the fluid, spread from top to bottom, improve the crushing efficiency and discharge efficiency, and reduce the overall energy consumption.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic diagram of the structure and principles of the pulverization system for ultrafine pulverization in the present invention;

Fig. 2 is a schematic front view of the superfine pulverization mechanism of the pulverization system for superfine pulverization according to the present invention;

Fig. 3 is a schematic diagram of the internal structure of the main frame and the cutter head assembly of the pulverization system for ultrafine pulverization of the present invention;

Fig. 4 is a three-dimensional structural schematic diagram of the separation and screening mechanism of the pulverization system for ultrafine pulverization of the present invention;

Fig. 5 is a partial cross-sectional schematic diagram of the separation and screening mechanism of the pulverization system for ultrafine pulverization of the present invention;

Fig. 6 is a three-dimensional structural schematic diagram of the classification wheel of the pulverization system for ultrafine pulverization of the present invention;

Among the figure: 1, superfine grinding mechanism, 11, main base, 111, crushing chamber, 112, upper base, 113, lower base, 12, vertical shaft, 13, cutterhead assembly, 131, leveling plate, 132, The first layer of blades, 133, upper cutterhead, 134, second layer of blades, 135, dividing plate, 136, third layer of blades, 137, lower cutterhead, 138, fourth layer of blades, 139, cutterhead seat, 14 , the second driving structure, 141, the second motor, 142, the second belt drive, 15, the tooth plate, 16, the frame, 2, the separation and screening mechanism, 21, the screening cylinder, 211, the feeding and returning section, 2111, Feed pipe, 2112, return pipe, 212, supplementary air section, 2121 supplementary air outlet, 213, settling section, 22, first driving structure, 221, first motor, 222, first belt drive, 23, classifying wheel, 31. Cyclone dust collector, 32. Pulse dust collector, 33. Insurance screen, 34. Air shutoff device, 4. High-pressure fan, 5. First feeding pipe, 6. Return feeding pipe, 7. Second feeding pipe , 8, screw conveyor auger, 81, bin to be crushed, 82, feeding port, 9, muffler.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example

As shown in Figure 1, a kind of pulverization system aimed at superfine pulverization includes superfine pulverization mechanism 1, separation and screening mechanism 2, dust removal mechanism and high-pressure blower 4 arranged in sequence; The first feeding pipe 5 is connected with the discharge port of the superfine pulverization mechanism 1, and the feed inlet of the separation and screening mechanism 2 is connected with the feed inlet of the superfine pulverization mechanism 1 through the return conveying pipe 6, and the separation and screening The discharge port of mechanism 2 is connected with the feed port of dedusting mechanism through the second feeding pipe 7, and the air outlet of described dedusting mechanism is connected with the inlet of high-pressure blower 4; The separation and screening mechanism 2 separates and screens the pulverized materials, wherein the materials with small particle size enter the dust removal mechanism from the discharge port of the separation and screening mechanism 2, and the materials with large particle size enter again from the return port of the separation and screening mechanism 2. Superfine pulverization mechanism 1; the high-pressure blower 4 is used to provide negative pressure suction for the pulverization system, and the high-pressure blower 4 in this embodiment is provided with a silencer 9 .

In order to ensure efficient separation and screening efficiency, in this embodiment, as shown in Figure 1, Figure 4, Figure 5 and Figure 6, the separation and screening mechanism 2 includes a screening cylinder 21 and a first drive structure 22, the screening The barrel 21 includes a feeding and returning section 211 , an air supply section 212 and a settling section 213 which are sequentially connected from bottom to top. The settling section 213 is provided with a classifying wheel 23 , and the first driving structure 22 is used to drive the classifying wheel 23 Rotate, the discharge port of the separation and screening mechanism 2 is located above the classifying wheel 23, the air supply section 212 is provided with an air supply port 2121 along the tangential direction of the flow, and the feeding and returning section 211 includes a feeding pipe 2111 and a feeding pipe 2111. Pipe 2112, the inlet of the return pipe 2112 communicates with the air supply section 212, the outlet of the return pipe 2112 is the return port of the separation and screening mechanism 2, and the return port of the separation and screening mechanism 2 is set Regarding the air device 34, the outlet of the feed pipe 2111 is inserted into the return pipe 2112, the outlet of the feed pipe 2111 is higher than the supplementary air section 212 and is arranged below the classifying wheel 23, the outlet of the feed pipe 2111 The pipe diameter is smaller than the pipe diameter of the air supply section 212, and the inlet of the feed pipe 2111 is the feed inlet of the separation and screening mechanism 2; the first drive structure 22 includes a first motor 221 and a first belt drive 222, The first motor 221 is arranged on the settling section 213, the driving wheel of the first belt drive 222 is connected to the output end of the first motor 221, and the driven wheel of the first belt drive 222 is connected to the classifying wheel 23. The first drive structure 22 of the embodiment can also be a direct drive.

In order to ensure excellent high-fineness crushing effect and efficient crushing efficiency, in this implementation, as shown in Figure 1, Figure 2 and Figure 3, the ultra-fine grinding mechanism 1 includes a main base 11, a vertical shaft 12, a cutter head assembly 13 and the second drive structure 14, the main base 11 is provided with a crushing chamber 111, the vertical shaft 12 is rotatably arranged in the crushing chamber 111, the cutterhead assembly 13 is arranged on the vertical shaft 12, and the first The two driving structures 14 are used to drive the vertical shaft 12 to rotate, and the inner wall of the crushing chamber 111 is provided with several tooth plates 15, and several of the tooth plates 15 are arranged in turn around the periphery of the cutter head assembly 13, and the tooth plates 15 are connected with the knife The gap between the disk assemblies 13 can be adjusted; further, the superfine grinding mechanism 1 also includes a frame 16, the main base 11 is arranged on the frame 16, and the main base 11 includes an upper base 112 and a lower Base 113, the pulverization chamber 111 is arranged in the upper base 112, and the pulverization chamber 111 is in the shape of a cone with a small top and a large bottom; The discharge port of the superfine pulverization mechanism 1 is set on the lower seat body 113; further, the cutter head assembly 13 includes a leveling plate 131, a first layer of blades 132, and an upper cutter head 133 arranged in sequence from top to bottom. , the second layer of blades 134, the partition 135, the third layer of blades 136, the lower cutter head 137, the fourth layer of blades 138 and the cutter head seat 139, and the uniform material plate 131 and the cutter head seat 139 are all fixedly sleeved on the vertical shaft 12; further, the second driving structure 14 includes a second motor 141 and a second belt transmission 142, the second motor 141 is arranged on the frame 16, the driving wheel of the second belt transmission 142 is connected to the first The output ends of the two motors 141 are connected, the driven wheel of the second belt drive 142 is connected with the vertical shaft 12, and the second drive structure 14 of this embodiment can also be a direct drive.

In order to facilitate the feeding of materials into the crushing system for ultrafine crushing, in this embodiment, as shown in Figure 1, the crushing system for ultrafine crushing also includes a screw conveying auger 8, and the screw conveying auger 8 The feeding port is provided with a bin 81 to be crushed, and the bin 81 to be crushed is provided with a feeding port 82, and the return port of the separation and screening mechanism 2 is connected to the bin 81 to be crushed through the return conveying pipe 6, and the screw conveying The discharge port of the auger 8 is connected with the feed port of the superfine grinding mechanism 1 .

In order to ensure the finished product discharge effect of the pulverization system for ultrafine pulverization, and to ensure the cleanliness of exhaust gas discharge, in this embodiment, as shown in Figure 1, the dust removal mechanism includes a cyclone dust collector 31, a pulse dust collector 32 and safety screen 33, the air outlet of the cyclone dust collector 31 is connected with the feed port of the pulse dust collector 32, and the discharge port of the cyclone dust collector 31 and the discharge port of the pulse dust collector 32 are connected with the safety screen 33 connected, the discharge port of the cyclone dust collector 31 and the discharge port of the pulse dust collector 32 are all provided with a relevant wind device 34, and the feed port of the cyclone dust collector 31 is the feed port of the dust removal mechanism, so The air outlet of the pulse dust collector 32 is the air outlet of the dust removal mechanism.

The crushing system for ultra-fine crushing can not only provide batch circulation production mode for special mixed materials, but also provide flow production mode or flow plus circulation production mode for single material, further improving the application value.

It works as follows:

First, the materials to be crushed are put into the chamber 81 to be crushed through the feeding port 82, and then conveyed to the crushing chamber 111 by the screw conveying auger 8. At the same time, the cutter head assembly 13 is driven by the second motor 141 to rotate at a high speed, and the materials are subjected to high-speed rotation. The first layer of blades 132, the second layer of blades 134, the third layer of blades 136 and the fourth layer of blades 138 impact, shear, friction and rupture, and fly to the tooth plate 15 of the grinding chamber 111 circumferential direction at a higher speed Impact, shearing, and friction are further crushed. After the material is crushed from top to bottom, it is sucked into the feeding pipe 2111 through the first feeding pipe 5 under the negative pressure conveying action of the high-pressure fan 4. The feed pipe 2111 with a large diameter suddenly enters the supplementary air section 212 with a large diameter, and the larger particles are rapidly sedimented and separated to form a first-stage falling speed sedimentation separation. High-efficiency separation to form a secondary supplementary air adjustment and screening, and then directly return to the crushing bin 81 through the return conveying pipe 6 for another crushing process. The fine particle materials after the first two separations reach the classifying wheel 23, and the classifying wheel 23 Driven by the first motor 221 to rotate, the fineness of the finished product can be further adjusted by adjusting the speed of the classifying wheel 23, and the finished material after screening is sucked into the cyclone for dust removal through the second feeding pipe 7 under the negative pressure conveying effect of the high-pressure fan 4 After the finished material reaches the cyclone dust collector 31, it is spirally settled, and the finished material enters the safety screen 33 through the air shutoff device 34 below the cyclone dust collector 31, and the dusty air enters the pulse dust collector 32 for separation, and the dust (finished material ) also enters the safety screen 33 through the air lock 34 below the pulse dust collector 32, and the clean air enters the high-pressure blower 4.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solutions of the present invention and its Any equivalent replacement or change of the inventive concept shall fall within the protection scope of the present invention.

Claims (10)

1. A pulverizing system aimed at ultrafine pulverization, characterized in that: comprise an ultrafine pulverization mechanism (1), a separation and screening mechanism (2), a dust removal mechanism and a high-pressure fan (4) arranged in sequence; the separation and screening mechanism The feeding port of (2) is connected with the discharge port of the superfine pulverizing mechanism (1) through the first feeding pipe (5), and the feeding port of the separation and screening mechanism (2) is passed through the feeding feeding pipe (6) It is connected with the feed port of the superfine pulverization mechanism (1), and the discharge port of the separation and screening mechanism (2) is connected with the feed port of the dust removal mechanism through the second feed pipe (7), and the discharge port of the dust removal mechanism The tuyere is connected to the inlet of the high-pressure blower (4); the superfine pulverization mechanism (1) is used to pulverize materials, and the separation and screening mechanism (2) separates and screens the pulverized materials, wherein the materials with small particle diameters are separated from The discharge port of the separation and screening mechanism (2) enters the dust removal mechanism, and the material with large particle size enters the superfine pulverization mechanism (1) again from the material return port of the separation and screening mechanism (2); the high-pressure blower (4) is used for The crushing system provides negative pressure suction. 2. The crushing system for ultra-fine crushing according to claim 1, characterized in that: the separation and screening mechanism (2) includes a screening cylinder (21) and a first driving structure (22), and the screening cylinder The body (21) includes a feeding and returning section (211), an air supply section (212) and a settling section (213) connected in sequence from bottom to top, and a classifying wheel (23) is arranged in the settling section (213). The first driving structure (22) is used to drive the classification wheel (23) to rotate, the discharge port of the separation and screening mechanism (2) is located above the classification wheel (23), and the air supply section (212) is along the tangential direction of the flow A supplementary air port (2121) is provided, the feeding and return section (211) includes a feed pipe (2111) and a return pipe (2112), and the inlet of the return pipe (2112) communicates with the supplementary air section (212) , the outlet of the return pipe (2112) is the return port of the separation and screening mechanism (2), the outlet of the feed pipe (2111) is inserted into the return pipe (2112), and the feed pipe ( The outlet of 2111) is higher than the supplementary air section (212) and is arranged below the classification wheel (23), and the pipe diameter of the feed pipe (2111) is smaller than the pipe diameter of the supplementary air section (212), and the feed pipe The inlet of (2111) is the feed inlet of the separation and screening mechanism (2). 3. The crushing system for ultra-fine crushing according to claim 2, characterized in that: the first drive structure (22) includes a first motor (221) and a first belt drive (222), and the first A motor (221) is arranged on the settling section (213), the driving wheel of the first belt drive (222) is connected to the output end of the first motor (221), and the driven wheel of the first belt drive (222) Connect with grading wheel (23). 4. The pulverizing system for superfine pulverization according to claim 2, characterized in that: the superfine pulverization mechanism (1) includes a main base (11), a vertical shaft (12), and a cutter head assembly (13) and the second drive structure (14), the main base (11) is provided with a crushing chamber (111), the vertical shaft (12) is rotatably arranged in the crushing chamber (111), and the cutter head assembly (13) Set on the vertical shaft (12), the second driving structure (14) is used to drive the vertical shaft (12) to rotate, and the inner wall of the crushing chamber (111) is provided with several tooth plates (15), and several tooth plates (15) are sequentially arranged around the outer circumference of the cutter head assembly (13), and the gap between the tooth plate (15) and the cutter head assembly (13) can be adjusted. 5. The pulverizing system for superfine pulverization according to claim 4, characterized in that: the superfine pulverization mechanism (1) also includes a frame (16), and the main base (11) is arranged on the frame (16), the main base (11) includes an upper base (112) and a lower base (113), the crushing chamber (111) is arranged in the upper base (112), and the crushing chamber (111) is The upper part is small and the lower part is large; the feed port of the superfine pulverization mechanism (1) is set on the top of the upper base (112), and the discharge port of the superfine pulverization mechanism (1) is opened on the lower base (113). ); or the feed port of the superfine pulverization mechanism (1) is provided on the lower base (113), and the discharge port of the superfine pulverization mechanism (1) is provided on the top of the upper base (112). 6. The crushing system for ultra-fine crushing according to claim 5, characterized in that: the cutter head assembly (13) includes a leveling plate (131), a first layer of blades arranged in sequence from top to bottom (132), upper cutterhead (133), second layer of blades (134), dividing plate (135), third layer of blades (136), lower cutterhead (137), fourth layer of blades (138) and cutterhead Seat (139), described screed plate (131) and cutter head seat (139) are all fixedly sleeved on the vertical shaft (12). 7. The crushing system for ultra-fine crushing according to claim 5, characterized in that: the second drive structure (14) includes a second motor (141) and a second belt drive (142), and the first Two motors (141) are arranged on the frame (16), the driving wheel of the second belt drive (142) is connected with the output end of the second motor (141), and the driven wheel of the second belt drive (142) Connect with vertical shaft (12). 8. The pulverizing system for ultrafine pulverization according to claim 5, characterized in that: the pulverization system for superfine pulverization also includes a screw conveyor auger (8), and the screw conveyor auger (8) The feeding port is provided with a bin (81) to be crushed, and a feeding port (82) is arranged on the bin (81) to be crushed, and the feeding port of the separation and screening mechanism (2) passes through the feeding conveying pipe (6) and The crushing bin (81) is to be connected, and the discharge port of the screw conveying auger (8) is connected with the feed port of the superfine crushing mechanism (1). 9. The crushing system for ultra-fine crushing according to any one of claims 1-8, characterized in that: the dust removal mechanism includes a cyclone dust collector (31), a pulse dust collector (32) and a safety screen (33 ), the air outlet of the cyclone dust collector (31) is connected with the feed inlet of the pulse dust collector (32), and the discharge outlet of the cyclone dust collector (31) and the discharge outlet of the pulse dust collector (32) are all Connect with insurance sieve (33), all be provided with relevant air device (34) at the outlet of described cyclone dust collector (31) and the outlet of pulse dust collector (32), the outlet of described cyclone dust collector (31) The feed inlet is the feed inlet of the dust removal mechanism, and the air outlet of the pulse dust collector (32) is the air outlet of the dust removal mechanism. 10. The crushing system for ultra-fine crushing according to any one of claims 1-8, characterized in that: the high-pressure fan (4) is provided with a silencer (9).

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