CN105536957A - Impeller, superfine mill and superfine milling system - Google Patents

Abstract

The invention provides an impeller, an ultrafine grinding machine using the impeller, and an ultrafine grinding system including the ultrafine grinding machine. Among them, the impeller includes the following structure: a disc, a straight-faced blade with a wear-resistant layer attached to the surface, and a straight-faced impact plate; there are multiple straight-faced blades, and they are evenly arranged radially on the disc; In the extension direction from the center to the outer diameter edge, the tail end of each straight-faced blade is provided with a straight-faced impact plate, and the first angle is formed between the straight-faced blade and the straight-faced impact plate; the tail end of the straight-faced blade is located at Within the outer diameter edge of the wheel disc; the starting end of the direct-facing impact plate is connected to the tail end of the straight-facing blade, and the tail end of the direct-facing impact plate exceeds the outer diameter edge of the wheel disc. The invention can grind the non-metal or metal with high hardness into superfine powder, and the wear of equipment parts is small, and it has the function of particle size classification.

Description

A kind of impeller and ultrafine grinding machine, ultrafine grinding system

technical field

The invention relates to the field of ultrafine powder processing, in particular to an impeller, an ultrafine grinding machine and an ultrafine grinding system using the impeller.

Background technique

In the field of ultrafine powder processing, the equipment that uses physical methods to process ultrafine powder mainly includes jet mills, vibration mills, ball mills, stirring mills, colloid mills, and mechanical impact mills.

Among them, the jet mill uses high-pressure gas to generate jet airflow through the nozzle, and the kinetic energy generated makes the particles collide, impact, rub and shear each other to achieve ultra-fine pulverization. However, this way of transferring kinetic energy to solid particles through gas makes the kinetic energy of solid particles limited, so the output of a single machine is low and the energy consumption is high.

The vibrating mill is an ultra-fine pulverizing equipment with ball or rod as the medium. The medium vibrates in the mill, which can crush the materials smaller than 2mm to several microns. It has the advantages of high efficiency, energy saving, space saving, and uniform particle size of the product. However, due to the limitation of the processing shape of the medium, wear and tear will inevitably occur, which will affect the purity of the product and consume a lot of energy.

The ball mill uses the mutual rolling and collision between the balls and the cylinders of the balls to crush or grind the powder particles in contact with the balls, and at the same time, the mixture is evenly dispersed by turbulent mixing in the gaps of the balls. And cover each other, so that the surface activity is reduced, the agglomeration is reduced, and then the crushing is continued. It can be dry-milled, wet-milled, and vacuum-milled. The minimum particle size of the ground product can reach 0.1μm, but this method has more impurities and consumes more energy. high.

Stirring mill is a device that uses a stirring device to move the grinding medium to produce impact, shear, and grinding effects, thereby crushing materials. The input power of the stirring mill is directly used for the rotation of the stirring mechanism to make the grinding medium move and crush the material, so its energy efficiency is higher than that of the ball mill and the vibration mill.

There are rotating gears and matching fixed teeth in the colloid mill, one of which rotates at high speed and the other is stationary. The processed material is pressurized by its own weight or external pressure to generate a downward spiral impact force, through the gap between the fixed and rotating teeth. In the gap, the material is effectively emulsified, dispersed, homogenized and crushed by strong shear force, friction force, high-frequency vibration, high-speed vortex and other physical effects. However, one of the rotating gear and the fixed gear rotates at a high speed and the other is stationary, so wear often occurs.

The mechanical impact pulverizer uses the impact elements (rods, blades, hammers, etc.) on the high-speed rotor around the horizontal or vertical axis to exert a strong impact on the material, and generate high-frequency vibration between it and the stator and between the materials. Equipment that is crushed by strong impact, shearing, etc.

The fan mill is a typical mechanical impact pulverizer. The impeller with 8-10 blades rotates at a high speed of 750-1500r/min. The high-speed coal pulverizer uses the high-speed rotating fan-type impact impeller to grind coal into coal powder. Used for grinding high-moisture lignite powder and soft bituminous coal powder.

There are also high-speed vortex pulverizers that are different from general pulverizers. For example, Chinese patent CN1929925B discloses a "highly turbulent mill and its dual negative pressure turbines". Vortex and turbulent flow are generated inside the mill cavity, thus forming a two-phase flow. Under the action of turbulent flow, the materials grind each other to produce collision and shear force, thus grinding the materials. However, its turbulent crushing ability is limited, and the material is further ultra-finely crushed mainly by the impact tooth plate.

Whether it is a fan mill or a mechanical impact pulverizer such as a high-speed eddy current pulverizer, when pulverizing materials with high hardness, such as quartz stone, ore, and metal, the impact components such as rods, blades, hammer heads, and impact tooth plates are severely worn and cannot be guaranteed. Work continuously for a long time.

Contents of the invention

The object of the present invention is to provide an impeller whose impact elements are more wear-resistant, especially when crushing hard materials.

Another object of the present invention is to provide a superfine pulverizer using the aforementioned impeller, which can grind nonmetals or metals with high hardness into superfine powders, has less wear and tear on equipment parts, and has the function of particle size classification.

Another object of the present invention is to provide an ultra-fine grinding system comprising the aforementioned ultra-fine grinding machine.

The technical scheme provided by the invention is as follows:

An impeller comprising:

A wheel disc, a straight-facing blade, and a straight-facing impact plate; and a wear-resistant layer is attached to the surface of the straight-facing blade and the windward side of the straight-facing impact plate;

There are a plurality of straight-facing blades, and they are arranged on the wheel disk in a direction diverging from the center to the periphery;

In the direction extending from the center of the wheel disc to the periphery, the tail end of each of the straight-facing blades is provided with the straight-facing impact plate, and the distance between the straight-facing blade and the straight-facing impact plate form the first included angle;

the trailing ends of the straight-facing blades are located within the outer diameter edge of the disc;

The starting end of the straight-facing impact plate is connected to the tail end of the straight-facing blade, and the tail end of the straight-facing impact plate exceeds the outer diameter edge of the wheel disk.

Preferably, the straight blades are arranged radially on the disc;

and / or;

The straight facing blades are arranged on the wheel disk along the tangential direction of the concentric circle of the wheel disk.

Preferably, the wear-resistant layer is a wear-resistant sheet of composite material;

and / or;

The wear-resistant layer is coated on the entire outer surface of the straight-facing blade and the straight-facing impact plate;

and / or;

The first included angle is 120-180°.

Preferably, the straight-facing blades are only arranged on one side surface of the disc;

The straight-facing impact plate extends from one side surface of the wheel to the other side surface.

Preferably, the wheel disc is provided with at least one balance hole near the center of the wheel disc.

The present invention also provides a kind of superfine pulverizer, it comprises:

The driving device, the inlet-side end cover with the material inlet, the outlet-side end cover with the material outlet, and the annular inner sawtooth ring, and the inlet-side end cover, the outlet-side end cover, and the inner sawtooth enclosing a chamber;

And the above-mentioned impeller is rotatably arranged in the chamber, and the impeller is connected with the driving device and driven to rotate by the driving device;

And the inner sawtooth ring is arranged on the periphery of the straight-facing impact plate of the impeller, the tip of the teeth of the inner saw-tooth ring is a distance away from the tail end of the straight-face impact plate, and the inner saw-tooth ring and the A gap for grinding is formed between the impellers;

The material enters the chamber from the feed port, and reaches the discharge port after passing through the gap for grinding.

Preferably, the sawtooth angle of the inner sawtooth ring is 60-120°;

and / or;

The serrations of the inner sawtooth ring include a windward side and a leeward side according to the rotation direction of the impeller, the angle between the windward side and the radial direction is a second angle, and the angle between the leeward side and the radial direction is a third angle. included angle, and the second included angle is smaller than the third included angle;

and / or;

A wear-resistant layer is attached to the surface of the inner sawtooth ring.

Preferably, the outlet-side end cover further includes an inner partition and an outer end cover, and the inner partition is arranged close to one side of the inner sawtooth ring;

An annular swirl chamber is formed between the inner partition plate and the outer end cover, and the inlet of the swirl chamber communicates with the chamber where the impeller is arranged, and the outlet of the swirl chamber communicates with the discharge port.

Preferably, the entrance of the swirling chamber is an annular entrance;

and / or;

The outlet of the swirling chamber is arranged along the tangential direction of the swirling chamber.

Preferably, the bottom of the swirl chamber is provided with a first slag outlet.

Preferably, the bottom of the inner sawtooth ring is provided with a second slag outlet;

and / or;

The outside of the inner sawtooth ring is covered with a heat conducting layer.

The present invention also provides a superfine grinding system, which includes:

Feeding device, the aforementioned ultra-fine pulverizer, blower device on the feed side or air induction device on the discharge side, gas-solid separation device;

The feeding device is communicated with the feed port of the ultrafine pulverizer;

The air blowing device communicates with the feed port of the superfine pulverizer; or, the air induction device communicates with the discharge port of the superfine pulverizer;

The inlet of the gas-solid separation device communicates with the outlet of the superfine pulverizer.

Through the impeller, ultrafine grinding machine and ultrafine grinding system provided by the present invention, at least one of the following beneficial effects can be brought:

1. It can grind hard non-metal or hard metal, and the finished powder obtained after processing has high purity. At the same time, due to the wear-resistant layer attached to the equipment, the wear can be greatly reduced.

2. It can improve the grinding effect through multiple structures. (1) Wear-resistant layers are attached to the surfaces of the impeller's straight-faced blades, straight-faced impact plates, and inner sawtooth rings. Since the wear-resistant layers are mostly made of composite materials, their surfaces are smooth and the friction between them and materials is small. Reduce the friction between the straight-faced blades, the straight-faced impact plate and the material, greatly reduce the wear of the wear-resistant layer, and increase the frontal impact force, which can effectively improve the grinding effect. (2) The sawtooth angle of the inner sawtooth ring is 60-120°. Compared with the sawtooth with a smaller angle in the prior art, it is not easy to break the tip of the tooth during grinding, and it can also provide the impact direction for the material particles The more vertical impact surface makes the material particles more likely to impact the tooth surface from the front, increasing the impact force and improving the grinding effect. (3) The relative movement between the straight-face impact plate and the inner sawtooth ring makes the medium fluid and the ground material particles form a complex non-uniform two-phase multi-fluid in the gap between the straight-face impact plate and the inner sawtooth ring. The particles collide and grind each other. At the same time, the medium fluid and material particles change the direction of motion after colliding with the sawtooth surface, and the movement speed will suddenly jump, so that the relative movement speed between the medium fluid whose movement direction is changed and other medium fluids increases, and the changed movement The relative movement speed between the material particles in the direction of the material and other material particles is increased, so that the medium fluid and material particles in the gap are further compressed indirectly, which increases the probability and intensity of the interaction of material particles, thereby improving the grinding effect.

3. The impeller is only provided with straight-faced blades on one side of the wheel, so that when the impeller rotates, the straight-faced blades on one side of the wheel can form a tighter gap between the inlet side and the outlet side of the wheel. Large pressure difference, so that it is easier to guide the material to move from the inlet side of the roulette to the straight-facing impact plate, bypass the end of the roulette, and finally reach the discharge side of the roulette.

4. The material grading function is realized by setting the slag outlet at the bottom of the inner sawtooth ring and the rotary chamber. The large particles falling from the slag port are collected and returned to the feed port for recirculation grinding.

Description of drawings

In the following, preferred embodiments will be described in a clear and understandable manner with reference to the accompanying drawings, and the above-mentioned characteristics, technical features, advantages and implementation methods of an impeller, ultrafine grinding machine, and ultrafine grinding system will be further described.

Fig. 1 is a kind of embodiment of the impeller of the present invention is viewed from the feed inlet side structural representation;

Fig. 2 is a structural schematic view of the impeller shown in Fig. 1 viewed from the outlet side;

Fig. 3 is an exploded view of an embodiment of the ultrafine pulverizer of the present invention;

Fig. 4 is a sectional view of the ultrafine pulverizer shown in Fig. 3;

Fig. 5 is a schematic diagram of an embodiment of the inner sawtooth ring in the ultrafine pulverizer of the present invention;

Fig. 6 is a schematic diagram of an embodiment of the rotary chamber in the ultrafine pulverizer of the present invention;

Fig. 7 is another embodiment of the impeller of the present invention, a structural schematic view viewed from the feed inlet side;

Fig. 8 is a particle size distribution column diagram obtained after grinding high-purity quartz with a particle size between 60 mesh and 120 mesh (250 micrometers and 125 micrometers) by applying the present invention;

Fig. 9 is a display diagram of an electron microscope obtained after grinding high-purity quartz with a particle size between 60 mesh and 120 mesh (250 micrometers and 125 micrometers) by applying the present invention;

Fig. 10 is another electron microscope display diagram of Fig. 9;

Fig. 11 is an electron microscope display diagram obtained after applying the present invention to grinding silicon steel sheets with a maximum size within 3mm;

Fig. 12 is another electron microscope display diagram of Fig. 11;

FIG. 13 is another electron microscope display of FIG. 11 .

Explanation of reference numbers:

G-feed side; F-rotation direction; H-material movement direction; A-first angle; B-serration angle; C-second angle; D-third angle;

1-roulette; 101-the inlet side surface of the roulette; 102-the outlet side surface of the roulette; 103-the outer diameter edge of the roulette; 104-concentric circles;

2-straight-faced blade; 201-the starting end of the straight-faced blade; 202-the tail end of the straight-faced blade;

3-straight-face impact plate; 301-starting end of direct-face impact plate; 302-tail end of direct-face impact plate;

4-balance hole; 5-motor shaft; 6-feed inlet; 7-inlet side end cover; 8-discharge port;

9-exit side end cover; 901-inner partition; 902-outer end cover; 903-revolving chamber; 9031-first slag outlet;

10-inner sawtooth ring; 1001-tooth tip; 1002-second slag outlet;

11 - space for grinding; 12 - cooling water flow channel.

detailed description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".

In Embodiment 1 of the impeller of the present invention, the impeller includes: a disc, straight blades and straight impingement plates, wherein the straight blades and the straight impingement plates are arranged on the disc. Compared with the arc-shaped blades commonly used in the prior art, the processing method of the straight-faced blade and the straight-faced impact plate of the present invention is simple. A wear-resistant layer is attached to the surface of the windward side of the straight-facing blade and the straight-facing impact plate (divided according to the direction of impeller rotation). The wear-resistant layer can not only enhance the wear resistance of the straight-facing blade and the straight-facing impact plate, but also because of the The grinding layer is mostly made of composite materials, such as cemented carbide or polycrystalline diamond (abbreviated as PCD) or polycrystalline cubic boron nitride (abbreviated as PCBN). The surface of the wear-resistant layer is smooth, and the friction between it and the material is small, thereby reducing the friction between the straight-face blade, the straight-face impact plate and the material, greatly reducing the wear of the wear-resistant layer, and increasing the frontal impact force , can effectively improve the grinding effect. At the same time, since the wear-resistant layer is mostly sheet-shaped and has low ductility, it is easier to attach the wear-resistant layer on the surface by designing the blade and the impact plate as a straight-face type. In the specific setting, there are multiple straight-faced blades, and they are set on the wheel disc along the direction diverging from the center to the periphery, preferably uniformly, so that when applied to the ultrafine pulverizer, the incoming materials and media The gas is guided and evenly distributed, and the pressure head of the medium gas can be increased when the impeller rotates. In the direction extending from the center of the disc to the periphery, a straight-facing impact plate is provided at the tail end of each straight-facing blade, and an angle is formed between the straight-facing blade and the straight-facing impact plate, and the clip Corners are formed on the non-pressure side sides of the straight-facing blade and the straight-facing impingement plate. The angled structure between the straight-face blade and the straight-face impact plate can make the medium gas and material diverted by the straight-face blade change the direction of movement through the straight-face impact plate and enter the orbit of circular motion. At the same time, the tail end of the straight-facing blade is located within the outer diameter edge of the wheel; the starting end of the straight-face impact plate is connected to the tail end of the straight-face blade, and the tail end of the straight-face impact plate exceeds the outer diameter edge of the wheel disc.

In the above-mentioned first embodiment, the arrangement of the straight blades on the wheel disk can be arranged radially, as shown in Figure 1; it can also be arranged on the wheel disk along the tangential direction of the concentric circle of the wheel disk, as shown in Figure 7 , wherein the concentric circles 104 are virtual concentric circles, which are schematically drawn in the figure only for the convenience of illustration. Preferably, the diameter of the concentric circles is less than one-third of the diameter of the wheel disc.

On the basis of the above-mentioned first embodiment, preferably, the straight-facing blade and the straight-facing impact plate are sealed and arranged on the wheel disc, so as to prevent the material from being stuck in the slit at the connection position between the straight-facing blade, the straight-facing impact plate and the wheel disc, and at the same time It will not affect the flow state of the medium gas when the impeller rotates.

On the basis of the first embodiment above, preferably, the aforementioned wear-resistant layer is not only attached to the windward side surface of the straight-facing blade and the straight-facing impact plate, but further covers the entire outer surface of the two, which can better protect The various structures of the straight-faced blade and the straight-faced impact plate are not worn.

On the basis of the first embodiment above, preferably, the angle between the straight-facing blade and the straight-facing impact plate is 120-180°.

In the above-mentioned first embodiment, straight-facing blades and straight-facing impact plates are provided on both sides of the wheel disc. In other embodiments, preferably, straight-facing blades are only provided on one side of the wheel disc, Straight-facing impact plates extend from one surface of the wheel to the other. When the impeller is used in a superfine pulverizer or other grinding structures, the surface on one side of the disc with straight-facing blades is the surface on the side of the feed port of the disc, so that when the impeller rotates, the disc is set on one side Straight-facing blades create a greater pressure difference between the inlet and outlet sides of the roulette, making it easier to guide material from the inlet side of the roulette to the straight-facing impingement plate and around it. The end of the roulette, and finally reaches the discharge port side of the roulette.

In a specific embodiment of the impeller of the present invention, with reference to Figures 1 and 2, the impeller includes a disc 1, a straight-facing blade 2 and a straight-facing impact plate 3, and all surfaces of the straight-facing blade 2 and the straight-facing impact plate 3 are attached with wear layer. As shown in Figure 1, on the feed side G side, the inlet side surface 101 of the wheel disc is evenly provided with eight straight-facing blades 2 (other numbers can also be used in other embodiments), and the eight straight-facing blades 2 The blades are arranged radially on the disk, the starting end 201 of the straight-facing blade is close to the center of the disk 1, and the tail end 202 of the straight-facing blade does not exceed the outer diameter edge 103 of the disk. The starting end 301 of the straight-facing impact plate is connected to the tail end 202 of the straight-facing blade, and extends to the outside of the wheel disk 1 along a direction forming a first angle A with the straight-facing blade, so that the tail end 302 of the straight-facing impact plate exceeds The outer diameter edge 103 of the wheel. As shown in FIG. 2 , on the outlet side surface 102 of the wheel disc, there is no straight-facing blade 2 , but the straight-facing impact plate 3 extends from the inlet side surface of the wheel disc to the outlet side surface 102 of the wheel disc. At the same time, a plurality of balance holes 4 are provided near the center of the disc 1, which not only can draw the gas from the outlet side of the disc back to the inlet side, but also when the impeller is applied to a superfine pulverizer or other grinding When the structure is used, the leakage of the medium gas in the chamber where the impeller is arranged can also be avoided, and the entry of external air can be avoided to affect the gas flow in the chamber.

The present invention also provides a superfine pulverizer, which uses the aforementioned impeller.

In embodiment one of the ultrafine pulverizer of the present invention, with reference to Fig. 3, it comprises: driving device (this embodiment is motor, not shown in the figure), be provided with the inlet side end cover 7 of feeding port 6, An outlet-side end cover 9 of the discharge port 8 and an annular inner sawtooth ring 10 are provided, and the inlet-side end cover 7 , the outlet-side end cover 9 and the inner sawtooth ring 10 form a chamber. The aforementioned impeller is rotatably arranged in the chamber, and the driving device is a motor, and the motor shaft 5 is inserted into the center of the wheel disc 1 to drive the impeller to rotate. The inner sawtooth ring 10 is arranged on the periphery of the straight-facing impact plate of the impeller, and the tip of the teeth of the inner saw-tooth ring 10 is a distance away from the tail end of the straight-face impact plate, and a gap for grinding is formed between the inner saw-tooth ring and the impeller . In this gap, the medium gas forms a high-speed circular motion under the action of the direct-facing impact plate, and the viscous force of the medium gas on the material particles makes the material particle clusters also perform circular motion. At the same time, the direct-facing impact plate and the The relative movement of the inner sawtooth ring makes the medium fluid and the material particles to be ground form a complex non-uniform two-phase multi-fluid in the gap between the straight-face impact plate and the inner sawtooth ring, and the particles collide and grind each other . At the same time, the medium fluid and material particles change the direction of motion after colliding with the sawtooth surface, and the movement speed will suddenly jump, so that the relative movement speed between the medium fluid whose movement direction is changed and other medium fluids increases, and the changed movement The relative movement speed between the material particles in the direction of the material and other material particles is increased, so that the medium fluid and material particles in the gap are further compressed indirectly, which increases the probability and intensity of the interaction of material particles, thereby improving the grinding effect. Due to the combined effect of centrifugal force and viscous force of the medium gas, the particle size distribution is from large to small near the inner sawtooth ring, the closer to the outside, the larger the particle size, and the smaller the particle size on the outside, the viscous force of the medium gas is greater than Its centrifugal force flows to the outlet along with the medium gas. In this embodiment, the material enters the chamber where the impeller is installed from the feed port 6, and after being uniformly distributed and guided by the straight blades on the inlet side of the wheel disk 1, it reaches between the straight impact plate and the inner sawtooth ring. The gap is ground for grinding, and finally reaches the discharge port.

In Embodiment 1 of the ultrafine pulverizer of the present invention, the grinding process of the material also includes the following: the impeller speed is very high, and when the medium air flow leaves the straight-facing impact plate, the velocity in the tangential direction is very large. In the gap between the inner sawtooth rings, the medium airflow forms a high-speed rotating airflow along the circumferential direction. When the material particles collide with the sawtooth face of the inner sawtooth ring, a rebound is formed, and the material particles form a higher relative speed with the medium airflow. The medium air flow is compressed sharply in front of the material particles, the flow velocity drops suddenly, and the air flow parameters such as pressure, density, and temperature increase significantly, forming a phenomenon similar to a shock wave or a shock wave, and even a sonic boom. The material particles are cracked and broken in the rapidly changing environment.

On the basis of the first embodiment of the ultrafine pulverizer, preferably, referring to Fig. 5, the sawtooth angle B of the inner sawtooth ring is 60-120°, which is not easy to The tip of the tooth 1001 is broken during grinding, and at the same time, because the sawtooth angle of the present invention is larger, the inclination of the two tooth surfaces (windward side and leeward side) of the sawtooth is relatively slow, which can provide a more vertical impact surface for material particles , so that the material particles tend to hit the tooth surface from the front, increasing the impact force and improving the grinding effect. More preferably, the teeth of the inner sawtooth ring include a windward side and a leeward side according to the rotation direction F of the impeller, the angle between the windward side and the radial direction is a second angle C, and the angle between the leeward side and the radial direction is a third angle C. The included angle D, and the second included angle C is smaller than the third included angle D, because the material particles often collide with the windward side when they are in circular motion, the second included angle is smaller than the third included angle, which can make the material particles more likely to hit from the front The windward side of the sawtooth increases the impact force and improves the grinding effect. More preferably, a wear-resistant layer is attached to the surface of the inner sawtooth ring, which has low frictional resistance, high hardness, wear resistance and high thermal conductivity. More preferably, the outside of the inner sawtooth ring is also coated with a heat conduction layer for quickly dissipating heat from the inner sawtooth ring and in the chamber. The heat-conducting layer can preferably be realized with flowing water channels. More preferably, the bottom of the inner sawtooth ring is provided with a second slag outlet 1002, which can gradually gather some materials that cannot meet the particle size requirements during the grinding process, and discharge them regularly or continuously to realize the classification of materials.

On the basis of the first embodiment of the ultrafine pulverizer, preferably, referring to Figure 6, an annular swivel chamber is also formed at the end cover on the outlet side, and the inlet of the swivel chamber communicates with the chamber where the impeller is set, and the outlet of the swivel chamber It communicates with the discharge port 8. Preferably, the entrance of the swivel chamber is an annular entrance, which corresponds to the annular grinding chamber (the aforementioned gap for grinding), so that the medium gas can use viscous force to move the various parts of the annular grinding chamber. The material particles (which have been ground to the preset requirements) are sent into the rotary chamber to facilitate the flow out of the material particles. Preferably, the outlet of the swivel chamber is set along the tangential direction of the swivel chamber. Since the material particles make circular motion in the swivel chamber, setting the outlet of the swivel chamber along the tangential direction of the annular swivel chamber can also guide the material particles to move in the current direction. The direction is discharged from the outlet of the swivel chamber. Both processes make it easier for the material particles to flow out of the chamber. Preferably, as shown in Figure 6, the bottom of the rotary chamber is also provided with a first slag outlet 9031, and the material particles that pass through the grinding chamber from the grinding chamber are screened for the second time here (the slag outlet of the inner sawtooth ring is the first slag outlet). Secondary screening), some materials that do not meet the particle size requirements gradually gather here, and are discharged regularly or continuously.

In the aforementioned embodiment of the ultrafine pulverizer, both sides of the disc of the impeller can be provided with straight-facing blades. Preferably, straight-facing blades can only be provided on the inlet side of the disc, and the outlet side is not provided, but directly facing Type impact plates need to be installed on both sides of the wheel at the same time, so as to form a gap with the inner sawtooth ring for grinding, and the grinding effect must be guaranteed.

In a preferred specific embodiment of the superfine pulverizer, referring to Fig. 3 and Fig. 4, it includes a motor as a driving device, an inlet-side end cover 7 provided with a feed port 6, and an end cover provided with a discharge port 8. The outlet side end cover 9 and the annular inner sawtooth ring 10, and the inlet side end cover 7, the outlet side end cover 9, and the inner sawtooth ring 10 are surrounded by a chamber, which is rotatably arranged as shown in Figure 1, The impeller shown in Fig. 2, the impeller includes a disc 1, a straight-facing blade 2 and a straight-facing impact plate 3, and the entire surfaces of the straight-facing blade 2 and the straight-facing impact plate 3 are attached with a wear-resistant layer. On the feed side G side, eight straight-facing blades 2 are uniformly arranged on the inlet side surface 101 of the wheel disc, and the eight straight-facing blades are all arranged radially on the wheel disc, and the starting end of the straight-facing blade 201 is close to the center of the disc 1 , and the tail end 202 of the straight blade does not exceed the outer diameter edge 103 of the disc. The starting end 301 of the straight-facing impact plate is connected to the tail end 202 of the straight-facing blade, and extends to the outside of the wheel disk 1 along a direction forming a first angle A with the straight-facing blade, so that the tail end 302 of the straight-facing impact plate exceeds The outer diameter edge 103 of the wheel. On the outlet-side surface 102 of the wheel disc, no straight-facing blades 2 are provided, but the straight-facing impact plate 3 extends from the inlet-side surface of the wheel disc to the outlet-side surface 102 of the wheel disc. At the same time, a plurality of balance holes 4 are provided on the wheel 1 near the center of the wheel. In this embodiment, the motor shaft 5 of the motor is inserted into the center of the wheel disk 1 to drive the impeller to rotate. And the inner sawtooth ring 10 is arranged on the periphery of the direct-facing impact plate 3 of the impeller, the tooth tip 1001 of the inner saw-tooth ring is at a distance from the tail end 302 of the direct-facing impact plate, and the distance between the inner saw-tooth ring 10 and the direct-facing impact plate 3 A gap 11 for grinding is formed between them. A wear-resistant layer is attached to the surface of the inner sawtooth ring 10, and the sawtooth angle of the inner sawtooth ring 10 is 60-120°. The included angle between the windward side and the radial direction of the inner sawtooth ring 10 is smaller than the included angle between the leeward side and the radial direction. The bottom of the inner sawtooth ring 10 is provided with a second slag outlet 1002 , and the outside of the inner sawtooth ring is covered with a flowing water channel, see the cooling water channel 12 shown in FIG. 3 . The outlet-side end cover 9 further includes an inner partition 901 and an outer end cover 902, wherein the inner partition 901 is arranged close to the side of the inner sawtooth ring 10; an annular swivel chamber 903 is formed between the inner partition 901 and the outer end cover 902, Moreover, the inlet of the swivel chamber communicates with the chamber where the impeller is installed, the outlet of the swirl chamber communicates with the discharge port 8, and both the inlet and outlet of the swirl chamber are arranged along the tangential direction of the annular swivel chamber. The bottom of the swirling chamber 903 is provided with a first slag outlet 9031 . In this embodiment, referring to the material flow direction shown by the dotted line in Fig. 4, the material enters the chamber where the impeller is provided from the feed port 6, and is evenly distributed and guided through the straight-facing blade 2 on the inlet side of the wheel disc 1 Finally, it reaches the gap 11 between the straight-facing impact plate 3 and the inner sawtooth ring 10 for grinding. Due to the joint action of centrifugal force and medium gas viscous force, close to the inner sawtooth ring, the particle size distribution is from large to small, and the closer to the outside The larger the particle size, the smaller the outer particle size, the viscous force of the medium gas is greater than its centrifugal force, and the medium gas flows to the rotary chamber 903, and finally rotates to the discharge port 8 in the rotary chamber 903. A part of the heat generated in the grinding chamber flows out with the fluid, and a part is exported through the cooling water in the cooling water channel 12 connected with the inner sawtooth ring.

The present invention also provides an ultra-fine grinding system comprising the aforementioned ultra-fine grinding machine, which includes a feeding device, the aforementioned ultra-fine grinding machine, an air blowing device on the feed side or an air blower on the discharge side. Air device, gas-solid separation device; Among them, the feeding device is connected with the feed port of the ultra-fine grinding machine; the air blowing device is connected with the feed port of the ultra-fine grinding machine; The discharge port of the machine is connected; the inlet of the gas-solid separation device is connected with the discharge port of the superfine pulverizer.

When applying the ultra-fine grinding system of the present invention, the traditional crushing device can be used to complete the rough processing of raw materials, and the processed particles can be added from the feed port through a feeding device, such as a screw conveyor, a vibrating conveyor, etc. With the flow of the medium gas, it enters the grinding chamber of the ultrafine pulverizer. The motor is mechanically driven to make the impeller speed in the superfine pulverizer exceed 3000rpm. The straight-faced blades on the inlet side of the impeller play the role of guiding and evenly distributing the material particles and medium gas, and increasing the pressure head of the medium gas. Part of the flow pressure head of the medium gas comes from the pressurization effect generated by the rotation of the straight-faced blades, and part of it can come from The air induction device installed on the discharge side, or the blower device installed on the feed side. After grinding, the two-phase flow of finished powder and medium gas is discharged from the outlet of the rotary chamber of the ultrafine pulverizer, and separated by a gas-solid separation device. The gas-solid separation device can use a gravity dust collector or an inertial dust collector. Filter, cyclone dust collector, filter dust collector, electric dust collector, wet dust collector, etc. After the separated medium gas is cooled, cleaned and dried, it can be reused or directly discharged into the atmosphere.

The ultra-fine pulverizer of the present invention can grind non-metal or metal with high hardness into ultra-fine powder, and the processed ultra-fine powder has high purity, less wear of equipment parts, and has the function of particle size classification. At the same time, for materials with good ductility, it is beneficial to process them into spherical ultrafine powder particles.

(1) Apply the present invention to grind high-purity quartz with a particle size between 60 mesh and 120 mesh (250 microns to 125 microns), and use Model780AccuSizer equipment to test after grinding. The particle size distribution is as shown in Figure 8, and the specific See Figure 9 and Figure 10 for electron micrographs of the powder. The specific measured particle size distribution data are as follows:

5% of the total particle number <1.93 microns; 10% of the total particle number <2.01 microns;

15% of the total particle number <2.11 microns; 20% of the total particle number <2.21 microns;

25% of the total particle number <2.31 microns; 30% of the total particle number <2.44 microns;

35% of the total particle number <2.65 microns; 40% of the total particle number <2.77 microns;

45% of the total particle number <3.03 microns; 50% of the total particle number <3.22 microns;

55% of the total particle number <3.48 microns; 60% of the total particle number <3.92 microns;

65% of the total particle number <4.36 microns; 70% of the total particle number <4.77 microns;

75% of the total particle number <5.47 microns; 80% of the total particle number <6.27 microns;

85% of the total particle number <7.18 microns; 90% of the total particle number <8.44 microns;

95% of total particles <10.80 microns; 99% of total particles <16.25 microns.

(2) Apply the present invention to grind the silicon steel sheet with the largest size within 3mm. After grinding, the particle size is less than 20 microns. After grinding, use an electron microscope to detect, as shown in Figure 11, Figure 12, and Figure 13.

It should be noted that the above embodiments can be freely combined as required. The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (12)

1. an impeller, is characterized in that, comprising:

Wheel disc, face type blade directly and face type shock plate directly; And described in face type blade directly and the described surface attachment facing the windward side of type shock plate directly has wearing layer;

Described type blade of facing directly is multiple, and the direction that Qie Yancong disperses at center is to the periphery arranged on described wheel disc;

Along from the direction that the center of described wheel disc extends to the periphery, described in the tail end facing type blade directly is provided with, face type shock plate directly described in each, and described in face type blade directly and described facing directly between type shock plate forms the first angle;

Within the described tail end facing type blade directly is positioned at the external diameter edge of described wheel disc;

The described initiating terminal facing type shock plate directly is connected with the described tail end facing type blade directly, described in face type shock plate directly tail end exceed the external diameter edge of described wheel disc.

2. impeller according to claim 1, is characterized in that:

Described type blade radial of facing directly is arranged on described wheel disc;

And/or;

Described type blade of facing directly is arranged on described wheel disc along the concentrically ringed tangential direction of wheel disc.

3. impeller according to claim 1, is characterized in that:

Described wearing layer is the wear plate of composite;

And/or;

Face type blade described in described wearing layer is coated on directly and describedly face directly on whole outer surfaces of type shock plate;

And/or;

Described first angle is 120-180 °.

4. impeller according to claim 1, is characterized in that:

Described type blade of facing directly is only arranged at the side of described wheel disc on the surface;

Described type shock plate of facing directly extends to opposite side surface on the surface from the side of described wheel disc.

5. impeller according to claim 1, is characterized in that:

Described wheel disc is provided with at least one balance pipe being close to described position of taking turns disk center.

6. a connected superfine pulverizer, is characterized in that, comprising:

The interior sawtooth circle of drive unit, the entrance side end cap being provided with charging aperture, the outlet side end cap being provided with discharging opening and annular, and described entrance side end cap, described outlet side end cap, described interior sawtooth corral are set as a chamber;

And the impeller be provided with rotationally in described chamber as described in any one of claim 1-5, described impeller is connected with described drive unit, and is rotated by described drive unit driving;

And the periphery of type of facing directly the shock plate of described impeller is located at by described interior sawtooth circle, the crown end of described interior sawtooth circle and the described tail end of type shock plate of facing directly at a distance of a distance, and form a space for grinding between described interior sawtooth circle and described impeller;

Material enters described chamber from described charging aperture, and arrives described discharging opening behind the described space for grinding.

7. connected superfine pulverizer according to claim 6, is characterized in that:

The sawtooth angle of described interior sawtooth circle is 60-120 °;

And/or;

The sawtooth of described interior sawtooth circle comprises windward side and lee face according to the rotation direction of impeller, the angle of described windward side and radial direction is the second angle, the angle of described lee face and radial direction is the 3rd angle, and described second angle is less than described 3rd angle;

And/or;

The surface attachment of described interior sawtooth circle has wearing layer.

8. connected superfine pulverizer according to claim 6, is characterized in that:

Described outlet side end cap comprises inboard partition and outside end cap further, and described inboard partition is close to described interior sawtooth circle side and arranges;

The spin chamber of an annular is formed between described inboard partition and described outside end cap, and the entrance of described spin chamber and the described chamber that impeller is set, the outlet of described spin chamber is communicated with described discharging opening.

9. connected superfine pulverizer according to claim 8, is characterized in that:

The entrance of described spin chamber is annular inlet;

And/or;

The outlet of described spin chamber is arranged along the revolution tangential direction of spin chamber.

10. connected superfine pulverizer according to claim 8, is characterized in that:

The bottom of described spin chamber is provided with first and falls cinder notch.

11. connected superfine pulverizers according to claim 6, is characterized in that:

The bottom of described interior sawtooth circle is provided with second and falls cinder notch;

And/or;

The outside of described interior sawtooth circle is coated with heat-conducting layer.

12. 1 kinds of System of Ultra Thin Power Rubbing, is characterized in that, comprising:

Charging gear, connected superfine pulverizer according to any one of claim 6-11, be positioned at the air-blast device of feed side or be positioned at blower unit, the gas-solid separating device of exit side;

Described charging gear is communicated with the charging aperture of described connected superfine pulverizer;

Described air-blast device is communicated with the charging aperture of described connected superfine pulverizer; Or described blower unit is communicated with the discharging opening of described connected superfine pulverizer;

The entrance of described gas-solid separating device is communicated with the discharging opening of described connected superfine pulverizer.