KR100389288B1 - centrifugal classifier in crusher system - Google Patents

Abstract

The present invention constitutes a separation member inside the primary classification chamber so that the moving path of the falling particles and the rising fine powder is separated, and the air introduced through the second inlet is distributed in the lower portion of the primary classification chamber in a balanced manner. It consists of a guide member for guiding to rise without colliding in the upper part of the supply chamber, and the 1st and 2nd inlet chambers are formed spirally so as to increase the rotational force of the air flowing through the first inlet and the second inlet and reduce the pressure loss. It prevents the collision of particles and air flowing into the upper part of the classification chamber and rising air entering the lower part of the classification chamber, and strengthens the rotational force inside the classification chamber to reduce pressure loss and lengthen particle floating time By separating the fine powders quickly and smoothly, the classification apparatus of the pulverization system that can maximize the classification efficiency.

Description

Centrifugal classifier in crusher system

The present invention relates to a classifier of a pulverization system for separating the coarse powder and fine powder ground in a pulverizer.

In general, a pulverization system is a system for pulverizing and storing various grains added to inorganic feeds or organic fertilizers, foods, medicines, and the like in a fine powder, and collecting dust.

In this grinding system, as shown in FIG. 1, the grinding object conveyed through the screw conveyor 10 is introduced into the grinder 20, and the grinding object introduced into the grinder 20 is uniformly scattered upwardly to the ring gear side. After spreading widely, external air is introduced by the impeller rotating at high speed, causing severe air vortex between the impeller blade and the saw blade of the ring gear. At this time, the magnetic media that are crushed and collided with the pulverizing media and free pulverization are freely pulverized in order to freely grind new materials, and small particles are continuously discharged into the gap between the ring gears. Then, the pulverized product that reaches the lower end of the ring gear is sufficiently pulverized and dropped into the lower casing to be second pulverized by the same process as above to provide granular fine powder.

The pulverized powder discharged from the crusher 20 is introduced into the classifier 30 for classifying the fine powder into micron fine powder. The classifier 30 is rotated by the speed of the impeller 35 connected to the motor 34 is converted according to the classification degree, the particles coming out of the grinder 20 is accompanied by a certain amount of air, thereby rotating the impeller 35 And the force exerted on the particles by the action of the centrifugal force given to the particles, the desired particles are accompanied by the air rising in the classifier 30 and discharged to the collector 40 through the impeller 35. Meanwhile, the impeller 35 is supported by the shaft and driven by the motor 34, and the change of the classification point is mainly adjusted by the increase and decrease of the rotation speed of the impeller 35. In addition, the coarse powder falling from the classifier 30 is guided to the screw conveyor 10 is recycled to the grinder (20).

The fine powder discharged from the classifier 30 is introduced into the collector 40 and collected by the rotational sedimentation of particles by gravity and its action, and the collected fine powder is stored in the storage tank via the rotary valve 50 ( 60, dust is collected in the dust collector (70).

However, in the pulverization system configured as described above, the conventional classifier is, as shown in Figure 2, the particles falling through the first inlet 312 by the pressure of the air introduced through the second inlet 322. In the process of rising to reach the impeller 35, a phenomenon in which the falling particles and the air collide with the rising air occurs, thereby lowering the classification efficiency.

In addition, the primary classification chamber 31 has a wide upper portion and a narrow lower upper and lower narrow shape, and the narrow lower portion is connected to the upper end of the secondary classification chamber 32 by being sharply connected to the lower portion through the second inlet 322. When the incoming airflow is biased and ascends at a time, a phenomenon that collides with the particles falling in the primary classification chamber 31 and the upper end of the secondary classification chamber 32 occurs and reaches unbalanced to the vicinity of the impeller 35. Therefore, the coarse powder to be discharged to the lower part of the secondary classification chamber 32 rises to the center of the impeller 35 together with the fine powder to lower the classification efficiency, and the rotational force inside the classification chamber is weak due to the characteristics of the suction-type closed circuit, so that the pressure loss is reduced. There is a problem that the separation of coarse powder and fine powder is not made smoothly because of the large and short floating time of the particles.

The present invention has been made in view of the above-mentioned conventional defects, and an object thereof is to prevent a collision between particles introduced into the upper portion of the classification chamber and air and air flowing into and lowered into the lower portion of the classification chamber. It is to provide a classifier of the crushing system to maximize the classification efficiency by enhancing the rotational force inside the chamber to reduce the loss of pressure and to increase the floating time of particles so that separation of coarse powder and fine powder can be made quickly and smoothly. .

In order to achieve the above object, the present invention constitutes a separation member inside the primary classification chamber so that the moving path of the falling particles and the rising fine powder is separated, and the air introduced through the second inlet is provided in the lower portion of the primary classification chamber. Balanced distribution is characterized in that a guide member for guiding to rise without colliding in the upper portion of the secondary classification chamber.

1 is a schematic configuration diagram of a grinding system equipped with a conventional classifier

2 is a cross-sectional view of a conventional classifier

3 is a schematic configuration diagram of a crushing system in which the present invention is equipped with a classification apparatus;

4 is a cross-sectional view of the classification apparatus of the present invention.

Figure 5 is a cross-sectional plan view of the separation member of the present invention

Figure 6 is a perspective view of the guide member of the present invention

<Explanation of symbols for the main parts of the drawings>

10: screw conveyor 20: grinder

30: Classifier 31: Primary Classroom

32: secondary classification room 33: upper casing

34: motor 35: impeller

36: separating member 37: guide member

40: collector 60: reservoir

Hereinafter, the configuration of an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The grinding system to which the present invention is applied includes a screw conveyor (10) configured to rotate a screw to convey a grinding object; A pulverizer 20 configured to pulverize a pulverization object transferred through the screw conveyor 10; A classifier 30 configured to classify the powder pulverized and discharged from the mill 20 into fine powder; A collector 40 configured to collect the fine powder discharged from the classifier 30; A rotary valve (50) configured to discharge a downflow of the collector supplied by dropping by gravity to the lower part of the collector (40) and to prevent the backflow of air from the lower part to the upper part; A storage tank 60 configured to store collected powders and selectively discharge the stored powders in a lower portion of the collector 40 and the rotary valve 50; The dust collector 70 is connected to the upper part of the collector 40 and configured to collect and process dust generated in the grinding process.

In the pulverization system, the classifier 30 includes a primary guide vane 311 having a first inlet 371 through which particles pulverized in the pulverizer and primary air flow, as usual. The primary classifying chamber 31 is connected to the lower portion of the primary guide vane 311, and the secondary guide vane 321 having a second inlet 322 through which secondary air flows into the lower portion of the primary classifying chamber 31. ) Is configured, the secondary classification chamber 32 is connected to the lower portion of the secondary guide vane 321, one side is in communication with the upper side of the primary guide vane 31 to discharge the fine particles to the collector 40 side The upper casing 33 is connected, and one side of the upper casing 33 is provided with a motor 34, and an inner center of the primary guide vane 311 is axially connected to the motor 34 to rotate. The impeller 35 is mounted.

In this classifier 30, this invention comprises the separating member 36 inside the primary classification chamber 31 so that the moving path of the falling particle | grains and the rising fine powder may be isolate | separated, The lower portion of the guide member 37 for guiding the air flowing through the second inlet 322 to be distributed in a balanced manner without colliding in the upper portion of the secondary classifying chamber 32 without colliding in the upper portion of the secondary classifying chamber 32. It is made by configuring, which will be described in more detail as follows.

The separating member 36 is a diameter that maintains a constant distance from the inner surface of the casing of the primary classification chamber 31, the upper portion is wide and the lower portion is narrow, the upper end is shown in Figure 5 to communicate with the primary guide vane 311 As shown, the plurality of ribs 361 are radially connected, the lower portion is close to the upper portion of the secondary guide vane 321, and the lower circumference is bent outwardly bent.

As shown in FIG. 6, the guide member 37 is provided with an upper plate 371 through which a first guide hole 371a having a diameter capable of accommodating a lower end of the casing of the primary classification chamber 31 is penetrated. The lower plate 372 having the same outer diameter as the upper plate 371 and having a diameter smaller than that of the first guide hole 371a at a lower portion spaced from the upper plate 371 by a predetermined distance is provided. The outer diameter and the outer surface of the upper and lower plates 371 and 372 coincide with each other between the upper plate 371 and the lower plate 372, and the circumferences of the first guide hole 371a and the second guide hole 372a. The diaphragm 373 formed to coincide with the inner surface is interposed to be spaced apart at regular intervals to form a classification space 374 having a wide upper portion and a narrow lower portion. The guide member 37 is installed to be accommodated in the secondary guide vane 321 is coupled to the first guide hole (371a) to match the lower portion of the casing of the primary classification chamber (31).

The following describes the operation of the present invention configured as described above.

As usual, the pulverized object transferred through the screw conveyor 10 is introduced into the pulverizer 20 and widely spread to the ring gear side, and then external air is introduced by an impeller rotating at high speed, and between the impeller blades and the saw blade of the ring gear. Severe air vortices are generated at the At this time, the magnetic media that are crushed and collided with the pulverizing media and free pulverization are freely pulverized in order to freely grind new materials, and small particles are continuously discharged into the gap between the ring gears. Then, the pulverized product that reaches the lower end of the ring gear is sufficiently pulverized and dropped into the lower casing to be second pulverized by the same process as above to provide granular fine powder.

Particles pulverized and discharged from the grinder 20 are introduced into the primary guide vane 311 through the first inlet 371 of the classifier 30, and some of the fine particles are introduced into the motor 34. By flowing into the inside of the impeller 35 to rotate at high speed is discharged to the outlet 331 of the upper casing 33, the coarse powder and the remaining fine powder by the centrifugal force of the impeller 35 to rotate at high speed separation member 36 It gathers and descends to the side of the first passage 362 formed between the outer side and the primary classification chamber 31 casing.

In addition, the air introduced into the second inlet 322 while the remaining coarse powder and the fine powder descends via the first passage 362 moves to the center along the spiral of the secondary guide vane 321 and thus the primary classification chamber ( 31 is uniformly distributed in a gap formed between the respective partitions 373 of the guide member 37 connected to the lower portion of the guide member 37 and flows in a balanced manner.

The air introduced into the inner classification space 374 of the guide member 37 flows back the fine powder lowered in the first passage 362 of the separating member 36, and the reversed fine powder is separated by the separating member 36. Ascending to the primary guide vane 311 via the second passage (363) formed on the inside, the increased derivative is joined to a part of the derivative introduced into the first inlet 312 and sucked into the impeller (35) It is discharged to the outlet 331 of the upper casing (33).

On the other hand, coarse particles having a large particle size not reversed in the inner classification space 374 of the guide member 37 are lowered to the lower part of the secondary classification chamber 32 by gravity, and the lowered coarse powder is guided to the screw conveyor 10 to grinder. At 20 it is crushed again.

Accordingly, the coarse and fine powder falling down and the moving path of the rising fine powder are separated by the first passage 362 formed on the outer side and the second passage 363 formed on the inner side by the separating member 36, respectively. 37) guides the air introduced through the second inlet 322 to be uniformly distributed and rises in a balanced manner without colliding with each other, so that the particles and air introduced into the upper portion of the classification chamber and the lower portion of the classification chamber are raised. It prevents air from colliding, and enhances the rotational force inside the classification chamber to reduce pressure loss and lengthen the suspended time of particles so that separation of coarse powder and fine powder is made quickly and smoothly.

In addition, the fine powder discharged through the discharge port 331 of the classifier 30 is introduced into the collector 40 and collected by the phenomenon that the particles are rotated and settled by gravity, and the collected fine powder is a rotary valve 50. While passing through), it is quantitatively dropped by gravity and discharged into the reservoir 60.

Meanwhile, the dust that has risen to the top of the collector 40 is discharged to the dust collector 70 and filtered, and only pure air is exhausted to the outside.

As described above, the present invention constitutes a separation member inside the primary classification chamber so that the moving path of the descending particles and the rising fine powder is separated, and the air introduced through the second inlet in the lower portion of the primary classification chamber is distributed in a balanced manner. The guide member is guided so as not to collide in the upper part of the secondary classification chamber to prevent the collision of particles and air introduced into the upper portion of the classification chamber with the air flowing into the lower portion of the classification chamber. By reducing the loss of pressure by increasing the rotational force of the particles to increase the suspension time of the particles so that the separation of coarse and fine powder can be made quickly and smoothly, it is possible to maximize the classification efficiency.

Claims (3)

The primary classifying chamber 31 is provided with a primary guide vane 311 at the upper side of which the first inlet 371 into which the pulverized particles and the primary air are introduced communicates to one side, and the primary classifying chamber 31 is provided. In the classifier of the crushing system comprising a secondary classifying chamber 32 having a secondary guide vane 321 at the upper side, the second inlet 322 into which the secondary air flows into the lower portion of the lower portion thereof, A separation member 36 is formed inside the primary classifying chamber 31 to separate the moving paths of the particles falling into the first inlet 312 and the rising fine powder to the outside and the inside, and the second inlet ( Crushing, characterized in that the guide member 37 for guiding the air flowing in through the 322 is distributed in a balanced manner without colliding in the upper portion of the secondary classification chamber 32 at the lower portion of the primary classification chamber 31 Classifier of the system. The method of claim 1 wherein the separating member 36, The upper part is wide and the bottom is narrow, and the upper part is connected to a plurality of ribs 361 so that the upper part is in communication with the primary guide vane 311. Classifier of the grinding system, characterized in that the circumference is bent outwardly in close proximity to the upper portion of the secondary guide vane (321). The guide member 37 according to claim 1, An upper plate 371 is provided with a first guide hole 371a of a diameter capable of accommodating a lower end of the casing of the primary classification chamber 31 at the center thereof, and an outer diameter of the upper plate 371 is spaced apart from the upper plate 371 by a predetermined distance. A lower plate 372 having the same diameter as 371 and having a smaller diameter than the first guide hole 371a and having a second guide hole 372a penetrated in the center is provided between the upper plate 371 and the lower plate 372. The diaphragm 373 whose outer diameters and outer surfaces of the lower plates 371 and 372 coincide and the circumference and the inner surface of the first guide hole 371a and the second guide hole 372a coincide with each other are radially spaced apart from each other. Classifier of the grinding system, characterized in that interposed.