JP4522383B2 - Airflow classifier and jet mill - Google Patents

Description

  The present invention relates to an airflow classifier and a jet mill.

  In a powder processing apparatus such as a jet mill that injects compressed air into a cylindrical casing to which powder is supplied and pulverizes the powder into fine powder, an air flow is provided to classify and collect the pulverized fine powder. Some have a type classifier (see, for example, Patent Document 1). In what is described in Patent Document 1, the powder processing apparatus includes a powder supply unit that supplies powder, a powder processing unit that processes powder, and a classification discharge that classifies and discharges the processed fine powder. The unit is divided into units, and the powder processing device can be easily redesigned according to the type of powder and the purpose of processing, making it compact and an example is a jet mill that pulverizes powder. ing.

  The airflow classifier includes a plurality of classification blades disposed on an outer peripheral portion between an annular plate and a disk separated in an axial direction, and a classification rotor that discharges fine powder classified by the classification blades from the inner peripheral side of the annular plate. And a motor connected in series to the disc side of the classifying rotor, and a fine powder discharging unit disposed on the annular plate side and discharging the classified fine powder discharged from the inner peripheral side of the annular plate to the outside. In many cases, the classification rotor and the fine powder discharger are housed in a casing, and an axial gap is provided between the fine powder discharger and the rotating classification rotor. Using such an airflow classifier in a powder processing apparatus such as a jet mill, for example, when processing various powders on a trial basis, the airflow classifier is cleaned each time in the previous test. It is necessary to remove the adhering fine powder and the like, and an airflow classifier that is easy to clean is desired.

JP 2004-290737 A

  In the powder processing apparatus described in Patent Document 1, since the airflow classifier is housed in an open casing of the classification discharge unit, the airflow classifier is more suitable than a general jet mill that is not unitized. Easy to clean, but the classification rotor of the airflow classifier and the fine powder discharge part remain integrated, so it is difficult to remove the fine powder adhering to the inside of the classification rotor and the gap between the classification rotor and the fine powder discharge part. There is a problem.

  Then, the subject of this invention is enabling it to clean easily the inside of the classification rotor of an airflow classifier, and the clearance gap between a classification rotor and a fine powder discharge | emission part.

In order to solve the above problems, the present invention provides a plurality of classification blades disposed on an outer peripheral portion between an annular plate and a disk separated in the axial direction, and fine particles classified by the classification blade are disposed on the inner periphery of the annular plate. The classification rotor discharged from the side, the motor connected in series to the disk side of the classification rotor, and the classified fine powder disposed on the annular plate side and discharged from the inner peripheral side of the annular plate A motor connected in series to the classifying rotor in an airflow classifier having a classifying rotor and a microscopic powder discharging unit that are housed in a casing with an axial clearance therebetween. The cylindrical socket fixed to the casing is supported so that its axial position can be adjusted, and the motor and the classifying rotor connected to the motor are detachable from the casing.

  That is, the motor connected in series to the classifying rotor is supported by a cylindrical socket fixed to the casing so that the axial position can be adjusted, and is detachable from the casing, so that the inside of the classifying rotor of the airflow classifier And the gap between the classification rotor and the fine powder discharge part can be easily cleaned. The axial position of the motor connected in series to the classifying rotor can be adjusted because the gap between the classifying rotor and the fine powder discharger is properly adjusted when the motor connected to the classifying rotor is reinstalled in the casing after cleaning. This is for adjustment.

  A means for supporting the motor on the socket so that the axial position of the motor can be adjusted is provided as an annular holder for holding the outer peripheral surface of the motor at an arbitrary axial position, and the annular holder is attached to the end surface of the cylindrical socket. By fixing, when the motor to which the classifying rotor is connected is remounted on the casing, the gap between the classifying rotor and the fine powder discharger can be easily adjusted.

  The outer peripheral surface of the motor is held by the annular holder at the end surface position of the socket when the classifying rotor connected to the motor is brought into contact with the fine powder discharge portion, and the outer peripheral surface of the motor is held. By sandwiching the shim plate between the holder and the end face of the socket, a gap between the classification rotor and the fine powder discharger can be reliably ensured.

  In addition, the present invention also employs a configuration of a jet mill equipped with any of the airflow classifiers described above.

  In the airflow classifier of the present invention, the motor connected in series to the classifying rotor is supported in a cylindrical socket fixed to the casing so that the axial position can be adjusted, and is detachable from the casing. It is possible to easily clean the inside of the classifying rotor of the classifier or the gap between the classifying rotor and the fine powder discharger.

  The means for supporting the motor on the socket so that the axial position can be adjusted is provided as an annular holder for holding the outer peripheral surface of the motor at an arbitrary axial position, and the annular holder is fixed to the end surface of the cylindrical socket. Thus, when the motor to which the classification rotor is connected is remounted on the casing, the gap between the classification rotor and the fine powder discharger can be easily adjusted.

  The outer peripheral surface of the motor is held by an annular holder at the end surface position of the socket when the classification rotor connected to the motor is brought into contact with the fine powder discharge portion, and the holder and the socket holding the outer peripheral surface of the motor By sandwiching the shim plate between the end face of the first and second end faces, a gap between the classification rotor and the fine powder discharger can be reliably ensured.

  In addition, since the jet mill of the present invention is equipped with any of the airflow classifiers described above, the airflow classifier can be easily cleaned and pulverized experimentally. Is preferred.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a jet mill equipped with an airflow classifier according to the present invention. In this jet mill, a cylindrical lower casing 1a is provided with a plurality of jet nozzles 2 for injecting compressed air toward the center, and a cylindrical upper casing 1b connected to the upper side of the lower casing 1a has an airflow type. The classifying rotor 3 and the fine powder discharging unit 4 of the classifier are accommodated. The powder A introduced into the bottom of the lower casing 1 a is pulverized by being pulverized by a jet stream of compressed air injected from the jet nozzle 2, and the pulverized and rising powder is rotated at high speed by the motor 5. Only the fine powder B classified by 3 and finely pulverized is discharged to the outside from the fine powder discharge section 4, and the coarse powder that is not sufficiently pulverized falls downward and is pulverized again.

  The jet mill is a small test apparatus, and the upper casing 1b is removed for each test, and the powder A for test is put into the bottom of the lower casing 1a and connected to the motor 5 as will be described later. The classifying rotor 3 is removed from the upper casing 1b, and cleaning is performed to remove the fine powder of the previous test adhering to the classifying rotor 3 and the fine powder discharging unit 4.

  As shown in FIG. 2, in the airflow classifier, a plurality of classification blades 3c are arranged on the outer peripheral portion between the annular plate 3a and the disc 3b separated in the axial direction, and classified by the classification blade 3c. A classification rotor 3 that discharges the fine powder B from the inner peripheral side of the annular plate 3a, a small DC motor 5 connected in series on the disc 3b side of the classification rotor 3, and an axial clearance on the annular plate 3a side. And a fine powder discharge section 4 for discharging the classified fine powder B discharged from the inner peripheral side of the annular plate 3a to the outside. The classification rotor 3 and the fine powder discharge section 4 are accommodated in the upper casing 1b. Yes.

  The fine powder discharge portion 4 is formed to have substantially the same diameter as the annular plate 3a of the classifying rotor 3, and is fitted to the bottomed cylindrical portion 4a into which the fine powder B discharged from the inner peripheral side of the annular plate 3a enters and the upper casing 1b. It is composed of a discharge pipe 4b for discharging the fine powder B inserted into the bottomed cylinder part 4a to the outside, and an air supply pipe 4c for supplying seal air to the gap between the annular plate 3a and the bottomed cylinder part 4a. The seal air supplied from the supply pipe 4c passes through the air passage 4d provided in the bottomed cylinder part 4a, and passes through the annular groove 4e provided in the upper end surface of the bottomed cylinder part 4a to the gap with the annular plate 3a. It comes to be supplied.

  The motor 5 is connected to a shaft portion 3d provided on the disc 3b of the classifying rotor 3 by a chuck 5a and a chuck holder 5b, and is inserted into a cylindrical socket 6 fixed to the end surface of the upper casing 1b. The upper end surface of the socket 6 is held by an annular holder 8 fixed to the casing 1b via a shim plate 7. The socket 6 is detachably attached to the casing 1 b with a ferrule joint 9, and the holder 8 is detachably attached to the socket 6 with a bolt 10.

  Accordingly, by removing the holder 8 from the socket 6 or by removing the socket 6 from the casing 1b, the motor 5 and the classifying rotor 3 connected to the motor 5 can be easily attached and detached upward from the casing 1b. 3 and the fine powder adhering to the gap with the fine powder discharger 4 can be easily removed. Note that the socket 6 is provided with an air passage 6a for supplying sealing air for preventing fine powder and the like from entering the connecting portion between the classification rotor 3 and the motor 5. Moreover, the outer diameter of the classifying rotor 3 is formed smaller than the inner diameter of the socket 6, and if the holder 8 is removed from the socket 6, the classifying rotor 3 and the motor 5 can be pulled out from the socket 6 integrally.

  As shown in FIGS. 3 (a) and 3 (b), the annular holder 8 is provided with a cutting portion 8a at one place in the circumferential direction, and is fitted into bolt holes 8b provided on both sides of the cutting portion 8a. A bolt 11a and a nut 11b tighten the outer peripheral surface of the motor 5 inserted on the inner peripheral side to hold the motor 5 at an arbitrary axial position, and a socket is provided with a bolt hole 8c provided in the annular portion. 6 is detachably fixed to the upper end surface of the apparatus. In this embodiment, the outer peripheral surface of the motor 5 is held by the holder 8 at the position of the upper end surface of the socket 6 when the classifying rotor 3 connected to the motor 5 is brought into contact with the bottomed cylindrical portion 4 a of the fine powder discharge portion 4. Then, by sandwiching the shim plate 7 between the holder 8 and the upper end surface of the socket 6, a clearance between the annular plate 3a of the classification rotor 3 and the bottomed cylindrical portion 4a of the fine powder discharge portion 4 is secured. Yes.

  In the embodiment described above, both the connection between the socket and the upper casing and the connection between the holder and the socket are detachable, but only one of the connections may be detachable. These detachable coupling means are not limited to the ferrule joint and the bolt coupling of the embodiment.

  Further, in the above-described embodiment, the jet mill is used as a small test apparatus, and powder is introduced into the bottom of the lower casing from which the upper casing is removed. A powder inlet may be provided.

The longitudinal cross-sectional view which shows the jet mill provided with the airflow type classifier which concerns on this invention Longitudinal sectional view showing the airflow classifier of FIG. a is a plan view showing the holder of FIG. 2, b is a side view of a

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Casing 2 Jet nozzle 3 Classification rotor 3a Annular plate 3b Disc 3c Classification blade 3d Shaft part 4 Fine powder discharge part 4a Bottomed cylinder part 4b Discharge pipe 4c Air supply pipe 4d Air passage 4e Annular groove 5 Motor 5a Chuck 5b Chuck Holder 6 Socket 6a Air passage 7 Shim plate 8 Holder 8a Cutting part 8b, 8c Bolt hole 9 Ferrule joint 10, 11a Bolt 11b Nut

Claims (4)

A plurality of classification blades are disposed on the outer peripheral portion between the annular plate and the disk separated in the axial direction, and a classification rotor that discharges fine powder classified by the classification blades from the inner peripheral side of the annular plate, and the classification rotor A motor connected in series to the disk side; and a fine powder discharger disposed on the annular plate side and discharging the classified fine powder discharged from the inner peripheral side of the annular plate to the outside. In the airflow classifier, in which an axial gap is provided between them and the casing is accommodated in a casing, a motor connected in series to the classifying rotor is connected to a cylindrical socket fixed to the casing. An airflow classifier that supports the position in the axial direction so as to be adjustable, and the classifying rotor connected to the motor is detachable from the casing.   The means for supporting the motor in the socket so that the axial position of the motor can be adjusted is provided with an annular holder for holding the outer peripheral surface of the motor at an arbitrary axial position, and the annular holder is attached to the end surface of the cylindrical socket. The airflow classifier according to claim 1, which is fixed.   The outer peripheral surface of the motor is held by the annular holder at the end surface position of the socket when the classifying rotor connected to the motor is brought into contact with the fine powder discharge portion, and the outer peripheral surface of the motor is held. The airflow classifier according to claim 2, wherein a shim plate is sandwiched between the holder and the end face of the socket.   A jet mill comprising the airflow classifier according to any one of claims 1 to 3.

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