JP2011088031A - Crushing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple crushing apparatus capable of crushing particulate objects to be crushed into powdery crushed products of good quality. <P>SOLUTION: A crushed product and an object to be crushed made to swirl by an air stream in a crushing space 121 of a crushing casing 120 is transferred via a plurality of circulation ducts 150 to a classifying space 141 of a classifying casing 140. Hence, the flow velocity or the like in the circulation ducts 150 of the crushed product and the object to be crushed carried by the air stream can be controlled by choosing the inner diameter, the number, and the relative angle to the swirling air stream, and the like, of the circulation ducts 150. Therefore, the circulation of the particles from the crushing space 121 to the classifying space 141 can be accelerated by increasing the flow velocity in the circulation duct 150, and the crushing apparatus 100 can stably be run without allowing the crushed product and the object to be crushed to remain in or to block the crushing space 121. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pulverization apparatus for pulverizing a granular material to be pulverized into a powdery pulverized product.

  With the recent enhancement of functionality of electronic parts and batteries, there is an increasing demand for a low-cost pulverization apparatus capable of producing high-performance pulverized products with high performance. For example, when the target raw material is ceramic, non-ferrous metal, mineral, etc. used in various industrial fields, the specific gravity is about 2-7.

  There are various types of pulverization processing apparatuses for obtaining a desired pulverized product. As a known technique, there is a pulverizing apparatus that uses mechanical impact energy due to collision with a hammer or pin that rotates at high speed, or collision energy between objects to be crushed by a jet stream.

  And there exists a classifier etc. which isolate | separate the obtained ground product into a suitable magnitude | size according to a use. Among these techniques, an integrated apparatus in which a pulverization and classification mechanism is incorporated in one apparatus is known as one of the demands for high functionality, high performance, and low cost.

  For example, in a certain pulverization processing apparatus, an object to be pulverized is pulverized by a pulverization hammer rotating at high speed, rises in a space formed by a casing and a guide ring, passes through the upper space of the guide ring, and is sent to the classification separator by an air flow. .

  The material to be crushed is classified by the interaction between the centrifugal force given by the rotating classification separator and the drag force caused by the sucked airflow, the fine pulverized product is drawn into the classification separator and discharged outside the machine, and the coarse material to be crushed is classified into the classification separator. The space between the guide ring and the guide ring is lowered and sent again to the grinding hammer.

  Here, the material before pulverization and the material that has been pulverized but not pulverized to the desired particle size and then pulverized again are pulverized, and the material pulverized to the desired particle size is pulverized. It is called a product.

  By integrating the pulverizing apparatus and the classifier as described above, higher performance, simplification of the equipment, and lower cost of the apparatus are obtained compared to installing each of them separately (for example, patent documents) 1).

Japanese Patent Laid-Open No. 10-277414

  As described above, the pulverized product has passed through the classification process by the classification separator, and the centrifugal force and centripetal force received by the pulverized product in the classification separator section are effectively used for quality adjustment such as the particle size distribution of the pulverized product. Adjustment is an important factor.

  Specifically, when it is desired to coarsen the pulverized product, in order to increase the drag effect, it is necessary to reduce the rotational speed of the pulverized object to reduce the rotational speed of the classification separator. On the other hand, when atomization is desired, in order to increase the effect of centrifugal force, it is necessary to increase the rotational speed of the classification separator and increase the swirling air flow velocity of the object to be crushed.

  However, in the conventional technology, since the swirling airflow is generated only by the classification separator, it is necessary to rotate the classification separator at a high speed in order to give a sufficient swirling air flow velocity to the object to be crushed. Requires a lot of power. In addition, as the specific gravity of the object to be pulverized increases, the inertia of the object to be pulverized increases and is classified before it is sufficiently accelerated / decelerated.

  The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a pulverization apparatus capable of pulverizing a granular material to be pulverized into a fine powdery pulverized product with a simple structure.

  The pulverization processing apparatus of the present invention is a pulverization processing apparatus for pulverizing a granular material to be pulverized, and is rotatably supported by a drive shaft in a substantially vertical axial direction. Driven through a crushing rotor that generates an airflow that swirls and a crushing rotor disposed in a rotating crushing space having a substantially vertical axis, and through which air is introduced into the bottom through hole A pulverizing casing through which a shaft is inserted, a classification rotor that is rotatably supported by a coaxial drive shaft above the pulverization rotor and generates an air flow for classifying the material to be crushed and the pulverized product, and an axial direction A classification rotor having a classification rotor connected to the grinding casing from above, and an outer periphery of the grinding casing and an outer periphery of the classification casing are piped. To be ground and ground product Having a circulation duct for transporting the milling space to classifying space.

  Therefore, in the pulverization processing apparatus of the present invention, the pulverization rotor is disposed in the pulverization space in the form of a rotating body whose axial direction of the pulverization casing is substantially vertical, and is rotatably supported by a drive shaft having a substantially vertical axial direction. The pulverization rotor that has been rotated causes the air to be pulverized by rotating the object to be pulverized. Since the drive shaft is inserted into the through hole at the bottom of the crushing casing through a gap through which outside air is introduced, the introduced outside air becomes an air flow swirled by the crushing rotor. The object to be crushed that swirls with the air current in the pulverization casing is pulverized into a powdery pulverized product by mutual collision. The pulverized product and the material to be pulverized which are swirled by the air flow in the pulverization space of the pulverization casing move to the classification space of the classification casing by the circulation duct. The pulverized product and the pulverized product moved to the classification space of the classification casing are divided into the pulverized product and the pulverized product by the airflow generated by the classification rotor rotatably supported by the coaxial drive shaft above the pulverization rotor. Classified. Since the classification casing is connected to the pulverization casing from above, the crushed material in the classified classification space falls again into the pulverization space. By repeating the above-described operation, the pulverized product crushed into a predetermined powder form from the granular material to be crushed is appropriately classified and discharged. However, in the pulverizing apparatus of the present invention, the pulverized product and the material to be crushed by the airflow in the pulverization space of the pulverization casing as described above are transferred to the classification space of the classification casing by the circulation duct. For this reason, by selecting the inner diameter and number of circulation ducts and the relative angle with the swirling airflow, it is possible to adjust the in-pipe flow rate of the pulverized product and the object to be crushed by the airflow in the circulation duct.

  In the pulverization apparatus as described above, a circulation duct may be provided on the outer peripheral surface of the pulverization casing.

  In the pulverization apparatus as described above, the circulation duct may be provided on the outer periphery of the upper surface of the pulverization casing.

  Further, in the pulverizing apparatus as described above, the circulation duct is connected to the pulverization casing in a direction in which the swirling direction of the airflow generated by the pulverization rotor and the direction of the airflow flowing out from the pulverization casing to the circulation duct do not reverse each other. May be.

  Further, in the pulverizing apparatus as described above, the circulation duct is connected to the classification casing in a direction in which the swirling direction of the airflow generated by the classification rotor and the direction of the airflow flowing from the circulation duct into the classification casing do not reverse each other. May be.

  In the pulverization apparatus as described above, the pulverization casing and the classification casing may be piped with a plurality of circulation ducts.

  The outer peripheral portion of the pulverization casing in the present invention means a portion in the vicinity of the outer periphery of the pulverization casing. Specifically, the outer peripheral surface of the pulverization casing, the upper surface outer periphery of the pulverization casing, the lower surface outer periphery of the pulverization casing, Means.

  In the pulverization processing apparatus of the present invention, the pulverized product and the material to be crushed by the airflow in the pulverization space of the pulverization casing as described above are transferred by the circulation duct to the classification space of the classification casing. For this reason, by selecting the inner diameter and number of circulation ducts and the relative angle with the swirling airflow, it is possible to adjust the in-pipe flow rate of the pulverized product and the object to be crushed by the airflow in the circulation duct. Therefore, it is possible to promote the circulation of particles from the pulverization space to the classification space by increasing the flow velocity in the pipe of the circulation duct, and the pulverization processing apparatus without causing the pulverized product and the object to be pulverized to stay or be blocked in the pulverization space. Can be operated stably. In addition, since the speed and angle of the pulverized product and the material to be crushed supplied from the circulation duct to the rotating classification rotor can be adjusted, the classification performance of the pulverization apparatus can be improved.

It is a typical vertical front view which shows the internal structure of the grinding | pulverization processing apparatus of embodiment of this invention. It is a cross-sectional top view which shows the AA cross section of FIG. It is a cross-sectional top view which shows the BB cross section of FIG. It is a cross-sectional top view which shows CC cross section of FIG. It is a typical vertical front view which shows the internal structure of the grinding | pulverization processing apparatus of one modification.

  An embodiment of the present invention will be described below with reference to FIGS. The pulverization apparatus 100 according to the present embodiment pulverizes a granular material to be pulverized into a powdery pulverized product. For this reason, as shown in FIG. 1, the pulverization processing apparatus 100 of the present embodiment is rotatably supported by a drive shaft 111 in a substantially vertical axial direction, and the air flow that pulverizes the object to be pulverized. The drive shaft 111 is connected to the pulverizing rotor 110 that generates the air and the gap in which the pulverizing rotor 110 is disposed in the pulverizing space 121 having a substantially vertical axis and the outside air is introduced into the bottom through-hole 122. A pulverizing casing 120 that is inserted, a classifying rotor 130 that is rotatably supported by a coaxial drive shaft 131 above the pulverizing rotor 110 and generates an air current that classifies the object to be crushed and the pulverized product, and a shaft A classification rotor 140 is disposed above the classification space 141 in the form of a rotating body whose center direction is substantially vertical, and is connected to the crushing casing 120 from above, and the crushing casing 120. It has a circulation duct 150 to transfer the outer peripheral portion and the outer peripheral portion of the classification casing 140 has piping and object to be crushed and pulverized product from the grinding space 121 to the classifying space 141, a.

  More specifically, in the pulverization processing apparatus 100 of the present embodiment, the circulation duct 150 whose longitudinal cross-sectional shape is forced to be U-shaped is piped to the outer peripheral surface of the pulverization casing 120 and the outer peripheral surface of the classification casing 140. ing.

  In the pulverization apparatus 100 of the present embodiment, the pulverization casing 120 and the classification casing 140 are piped by a plurality of six circulation ducts 150. These six circulation ducts 150 are piped to the crushing casing 120 and the classification casing 140 at each position rotated by 60 degrees in the horizontal direction, as shown in FIGS.

  However, in the pulverization processing apparatus 100 of the present embodiment, as shown in FIG. 2, the circulation duct 150 is not radially connected to the pulverization casing 120, and the horizontal direction of the airflow generated by the pulverization rotor 110 is on the horizontal plane. Is inclined to a predetermined angle and piped to the crushing casing 120.

  More specifically, the circulation duct 150 is piped to the grinding casing 120 in a direction in which the swirling direction of the airflow generated by the grinding rotor 110 and the direction of the airflow flowing out from the grinding casing 120 to the circulation duct 150 are not opposite to each other. Has been.

  In the pulverization processing apparatus 100 of the present embodiment, a raw material introduction duct 123 is also piped to the pulverization casing 120, and a granular material to be pulverized is introduced from the raw material introduction duct 123 into the pulverization space 121.

  In the pulverization processing apparatus 100 of the present embodiment, the apparatus bottom 160 below the pulverization rotor 110 is formed in a box shape, and an outside air inlet 161 for introducing outside air is formed in the apparatus bottom 160. The outside air introduced from the outside air introduction port 161 flows into the grinding space 121 through the gap between the drive shaft 111 of the grinding rotor 110 and the through hole 122 of the grinding casing 120.

  In the pulverization processing apparatus 100 of the present embodiment, the upper part 170 of the apparatus above the classification rotor 130 is also formed in a box shape, and a carry-out port 171 for the object to be crushed is formed in the upper part 170 of the apparatus. Note that a so-called bag filter (not shown) is attached to the carry-out port 171.

  As shown in FIGS. 1 and 2, the crushing rotor 110 is formed, for example, in a shape in which a plurality of centrifugal blocks 113 are arranged on the upper surface of a disk-shaped rotor main body 112. As shown in FIG. 3, the classification rotor 130 is formed, for example, in a shape in which a large number of plate-shaped classification blades 133 are arranged radially on the outer peripheral surface of a cylindrical rotor body 132.

  In the above-described configuration, in the pulverizing apparatus 100 according to the present embodiment, the pulverizing rotor 110 is disposed in the pulverizing space 121 having a rotating body in which the axial direction of the pulverizing casing 120 is substantially vertical. A crushing rotor 110 rotatably supported by a drive shaft 111 in the center direction generates an air flow that turns and crushes the object to be crushed.

  Since the drive shaft 111 is inserted into the through-hole 122 at the bottom of the crushing casing 120 through a gap through which outside air is introduced, the introduced outside air becomes an airflow swirled by the crushing rotor 110.

  An object to be crushed that swirls with an air current in the pulverizing casing 120 is pulverized into a powdered pulverized product by mutual collision. The pulverized product and the material to be crushed by the airflow in the pulverization space 121 of the pulverization casing 120 move to the classification space 141 of the classification casing 140 by the circulation duct 150.

  The pulverized product and the material to be crushed that have moved to the classification space 141 of the classification casing 140 are crushed by the airflow generated by the classification rotor 130 that is rotatably supported by the coaxial drive shaft 131 above the pulverization rotor 110. And pulverized products.

  Since the classification casing 140 is connected to the pulverization casing 120 from above, the pulverized material in the classified classification space 141 falls again into the pulverization space 121. By repeating the above-described operation, the pulverized product crushed into a predetermined powder form from the granular material to be crushed is appropriately classified and discharged.

  However, in the pulverization processing apparatus 100 of the present embodiment, the pulverized product and the material to be crushed by the air flow in the pulverization space 121 of the pulverization casing 120 are transferred by the circulation duct 150 to the classification space 141 of the classification casing 140 as described above. Is done.

  Therefore, by selecting the inner diameter and number of the circulation duct 150 and the relative angle with the swirling airflow, the in-pipe flow rate of the pulverized product and the object to be crushed by the airflow in the circulation duct 150 can be adjusted.

  For this reason, in the pulverization processing apparatus 100 of the present embodiment, it is possible to prevent the pulverized product and the object to be pulverized from being blocked in the circulation duct 150 by increasing the flow velocity in the pipe, and to stably operate the pulverization processing apparatus 100. Can do.

  In addition, since the speed and angle of the pulverized product and the material to be pulverized supplied from the circulation duct 150 to the rotating classification rotor 130 can be adjusted, the classification performance of the pulverization apparatus 100 can be improved.

  In addition, even when the material to be crushed is a heavy specific gravity material, the material to be crushed after sufficiently accelerating inside the circulation duct 150 can flow into the classification casing 140, so that the swirling speed at the time of classification is sufficient and the classification accuracy is improved. Can be increased.

  For example, it is desirable to select the inner diameter and the number of circulation ducts 150 so that the flow velocity in the pipe is faster than the terminal velocity determined by the operating conditions such as the specific gravity of the material to be crushed and the size of the material to be crushed.

  Moreover, in the pulverizing apparatus 100 of the present embodiment, the circulation duct 150 is piped on the outer peripheral surface of the pulverizing casing 120 as shown in FIG. For this reason, the object to be crushed and the pulverized product in the pulverizing space 121 swirled by the air flow generated by the pulverizing rotor 110 are introduced into the circulation duct 150 very smoothly.

  In particular, in the pulverization processing apparatus 100 of the present embodiment, as shown in FIG. 2, the circulation duct 150 is piped to the pulverization casing 120 so as to be inclined in the swirl direction of the airflow generated by the pulverization rotor 110.

  For this reason, the material to be crushed and the pulverized product in the pulverization space 121 are satisfactorily introduced into the circulation duct 150 by the air flow generated by the pulverization rotor 110, and the flow velocity in the pipe is also favorably maintained.

  Furthermore, in the pulverization processing apparatus 100 of the present embodiment, as shown in FIGS. 3 and 4, the circulation duct 150 is piped to the classification casing 140 while being inclined in the swirl direction of the airflow generated by the classification rotor 130. .

  More specifically, the circulation duct 150 is piped to the classification casing 140 in a direction in which the swirling direction of the airflow generated by the classification rotor 130 and the direction of the airflow flowing into the classification casing 140 from the circulation duct 150 do not reverse each other. Has been.

  Therefore, the pulverized material and the pulverized product are discharged from the circulation duct 150 to the classification space 141 in the airflow direction of the classification rotor 130. Therefore, the burden on the classification rotor 130 can be reduced, and the classification performance can be improved.

  Of course, the pulverized product particle size and classification accuracy can also be changed by changing the speed of the classification rotor 130, but the burden on the classification rotor 130 is reduced by assisting the swirling airflow with the circulation duct 150 as compared with the case of only the classification rotor 130. can do.

  Moreover, in the pulverizing apparatus 100 of the present embodiment, as shown in FIGS. 2 and 4, the pulverizing casing 120 and the classification casing 140 are piped at equal intervals by a plurality of six circulation ducts 150.

  For this reason, since the space density of the to-be-ground object and the pulverized product swirling in the pulverization space 121 and the classification space 141 by the air current can be made uniform, the pulverization performance and classification performance can be stabilized.

  The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the above embodiment, the circulation duct 150 whose longitudinal cross-sectional shape is forced to be U-shaped is illustrated as being piped to the outer peripheral surface of the crushing casing 120 and the outer peripheral surface of the classification casing 140.

  However, the circulation duct 150 may be piped on the outer periphery of the upper surface of the crushing casing 120 as in the crushing processing apparatus 200 illustrated in FIG. In this case, compared to the case where the circulation duct 150 is piped on the outer peripheral surface of the pulverization casing 120, the pulverized material and the pulverized product that are swirled by the airflow of the pulverization rotor 110 are less likely to be introduced into the circulation duct 150.

  For this reason, it is possible to reduce the rate at which the object to be crushed that is not sufficiently pulverized is introduced from the pulverization space 121 to the classification space 141, and to reduce the burden of classification by the classification rotor 130 and to improve accuracy. .

  In the above embodiment, as shown in FIG. 3, for example, the classification rotor 130 in which a large number of plate-shaped classification blades 133 are radially arranged on the outer peripheral surface of the cylindrical rotor main body 132 is illustrated. However, the shape of the classification rotor can be variously modified. Similarly, the shape of the crushing rotor 110 can be variously modified (both not shown).

  Further, in the above embodiment, a plurality of circulation ducts 150 having a uniform inner diameter are arranged uniformly in the horizontal direction and the pulverization casing 120 and the classification casing 140 are piped. However, the number of circulation ducts 150 can be changed variously.

  Further, the plurality of circulation ducts 150 may be arranged unevenly, the inner diameters of the circulation ducts 150 may be uneven, and orifices may be formed (none of which are shown). When the inner diameter of the circulation duct 150 is non-uniform or an orifice, the flow velocity can be adjusted there, so that the classification characteristics can be adjusted. In particular, when the inner diameter of the circulation duct 150 is continuously changed, the flow rate can be adjusted while satisfactorily preventing the accumulation of the material to be ground and the ground product.

  Moreover, in the said form, as shown in FIG. 2, it illustrated that the circulation duct 150 was inclined in the turning direction of the airflow generated by the grinding | pulverization rotor 110, and was piped by the grinding | pulverization casing 120. As shown in FIG.

  However, the circulation duct 150 may be piped at right angles without being inclined to the outer peripheral surface of the crushing casing 120. In this case, the speed and flow rate at which the material to be crushed and the pulverized product in the pulverization space 121 are introduced into the circulation duct 150 by the air flow generated by the pulverization rotor 110 are reduced, so that the classification characteristics can be adjusted.

  Similarly, in the said form, as shown in FIG.3 and FIG.4, it illustrated that the circulation duct 150 inclines in the turning direction of the airflow generated by the classification rotor 130, and is piped by the classification casing 140. FIG.

  However, the circulation duct 150 may be piped at right angles without being inclined on the outer peripheral surface of the classification casing 140 (not shown). In these cases, the speed of the pulverized product and the pulverized product flowing into the classification casing 140 from the circulation duct 150 can be reduced, which is effective when a coarse pulverized product is desired.

  Needless to say, the above-described embodiment and a plurality of modifications can be combined within a range in which the contents do not conflict with each other. Further, in the above-described embodiments and modifications, the structure of each part has been specifically described, but the structure and the like can be changed in various ways within a range that satisfies the present invention.

DESCRIPTION OF SYMBOLS 100 Grinding processing apparatus 110 Grinding rotor 111 Drive shaft 112 Rotor main body 113 Centrifugal block 120 Grinding casing 121 Grinding space 122 Through hole 123 Raw material introduction duct 130 Classification rotor 131 Drive shaft 132 Rotor main body 133 Classification blade 140 Classification casing 141 Classification space 150 Circulation duct 160 Device bottom portion 161 Outside air introduction port 170 Device upper portion 171 Unloading port 200 Grinding processing device

Claims (6)

A pulverization processing apparatus for pulverizing a granular material to be pulverized into powdered pulverized products,
A pulverizing rotor that is rotatably supported by a drive shaft in a substantially vertical axial direction and generates an air flow for rotating and pulverizing the object to be crushed;
A crushing casing in which the crushing rotor is disposed in a crushing space in the form of a rotating body whose axial direction is substantially vertical, and the drive shaft is inserted through a gap through which outside air is introduced into a through hole at the bottom;
A classification rotor that is rotatably supported by a coaxial drive shaft above the crushing rotor and generates an air flow for classifying the object to be crushed and the pulverized product;
A classifying casing in which the classifying rotor is disposed above the classifying space in the form of a rotating body whose axial direction is substantially vertical and connected to the grinding casing from above;
A circulation duct that pipes the outer peripheral portion of the pulverizing casing and the outer peripheral portion of the classification casing to transfer the material to be crushed and the pulverized product from the pulverization space to the classification space;
A pulverizing apparatus.   The circulation duct is piped to the pulverization casing in a direction in which the swirl direction of the airflow generated by the pulverization rotor and the direction of the airflow flowing out from the pulverization casing to the circulation duct do not reverse each other. 2. The pulverization apparatus according to 1.   The circulation duct is piped to the classification casing in a direction in which a swirling direction of the airflow generated by the classification rotor and a direction of an airflow flowing into the classification casing from the circulation duct do not reverse each other. The pulverizing apparatus according to 1 or 2.   The pulverization apparatus according to any one of claims 1 to 3, wherein the circulation duct is piped on an outer peripheral surface of the pulverization casing.   The pulverization apparatus according to any one of claims 1 to 3, wherein the circulation duct is piped on an outer periphery of an upper surface of the pulverization casing.   The pulverization apparatus according to any one of claims 1 to 5, wherein the pulverization casing and the classification casing are piped by a plurality of the circulation ducts.

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