JP2008012598A - Centrifugal projection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal projection device which can improve the life of a driving motor by reducing the rotational vibrations due to the rotational unbalance of an impeller, and also can suppress the noises due to the vibrations. <P>SOLUTION: The centrifugal projection device is composed of a housing 2, the driving motor 4 to be mounted on the side portion of the housing via a mounting flange 3, an impeller 7 which is fixed to the drive shaft of the driving motor via a hub 6 and has a plurality of blades 15, a distributer 8 which is fixed so as to be coaxial with the driving shaft and has slits arranged at nearly constant interval in the circumferential direction, a control cage 9, the rear end portion of which is arranged around the aperture portion 19 formed on the other side portion opposed to the above-mentioned side portion of the housing, and the tip end portion of which has a distributing windows 18 formed thereon and is elongated between the distributer and the blades, and an introducing pipe 10 to be mounted on the aperture portion. A bearing 12 is assembled between the mounting flange and the hub by arranging a cushioning member 11 on the inner circumferential portion of the mounting flange. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a centrifugal projection device. More specifically, the present invention relates to a centrifugal projection device that can stabilize the rotational balance of an impeller.

  Conventionally, a blasting process for peeling and removing rust, burrs, scales, paints, and the like on the surface of the object to be processed is performed by projecting a projection material such as a fine hard sphere toward the object to be processed. In this blasting process, a centrifugal projection device is used in which an impeller provided with a plurality of blades is rotated at a high speed so that the blades continuously project the projection material by centrifugal force. For example, Patent Document 1 discloses a plurality of rotating bodies arranged in a rotatable manner and attached to a circular rotating plate and radially arranged on the rotating plate, forming a substantially cylindrical space at the inner base end. An impeller composed of a single blade is mounted, and in the space of the rotating body, a bottomed cylindrical shape is formed and extends over the entire length in the longitudinal direction, and the same number of openings as the number of the blades are provided in the circumferential direction. A distributor formed at a substantially equal interval is mounted so as to be substantially concentric with the rotating body, and a separate control cage is provided between the inner base end of the blade and the distributor. A projection device is described.

JP-A-9-150369

  Since the impeller is rotationally driven in a cantilevered state by a drive motor, at high speed rotation, for example, dispersion of the projection material to the blade, impeller mounting error, wear of rotating parts of the drive motor, etc., the rotational balance of the impeller Occurs, the impeller causes rotational vibration, and the housing vibrates to generate noise. In the case of long-term use, this rotational vibration may cause a fluctuating load on a rotating part of the drive motor, for example, a bearing that supports the impeller, thereby reducing the life. Therefore, it is conceivable to improve the life of the impeller holding structure by changing the bearing to one having a large load resistance or using a large drive motor. However, the cost increases as the device becomes larger. In addition, the idea of using a bearing with a large load resistance as the bearing of the drive shaft cannot be applied to a small-sized centrifugal projection device that requires high-speed rotation because the allowable rotational speed of the bearing is reduced.

  Therefore, in view of the above circumstances, the present invention provides a centrifugal projection device that can reduce the rotational vibration due to the rotational balance of the impeller and improve the life of the drive motor, and can suppress noise due to vibration. For the purpose.

  A centrifugal projection device of the present invention includes a housing, a drive motor attached to a side portion of the housing via a mounting flange, and an impeller having a plurality of blades attached to a drive shaft of the drive motor via a hub. The distributor is installed coaxially with the drive shaft in the inner circumferential space of the impeller and has slits at substantially equal intervals in the circumferential direction, and the rear end portion is formed on the other side portion facing the side portion of the housing. A control cage attached to the periphery of the opening and extending between the distributor and the blade, and a tip formed with a dispersion window, and attached to the housing so as to supply the projection material to the opening A centrifugal projection device comprising an introduction cylinder, wherein a buffer is provided between the mounting flange and the hub on the inner peripheral portion of the mounting flange. And characterized by comprising a built-in bearing and location.

  According to the present invention, the shock absorber plays a role of vibration isolation, and the vibration generated in the drive motor and the housing due to the rotation balance of the impeller can be reduced, so that the life of the drive motor can be improved and the noise caused by the vibration can be suppressed.

  The centrifugal projection device of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a centrifugal projection apparatus according to an embodiment of the present invention includes a housing (impeller case) 2 disposed on an upper wall 1 disposed on a ceiling of a cleaning chamber of the apparatus body, The drive motor 4 is attached to the side (cover) 2a of the housing 2 via the attachment flange 3, and is fixed to the drive shaft 4a side of the drive motor 4 by a taper lock member comprising a taper sleeve 5a and a taper lock nut 5b. The impeller 7 attached via the hub 6, the distributor 8 attached coaxially with the drive shaft 4 a in the inner circumferential space S of the impeller 7, and the other side 2 b facing the side 2 a of the housing 2. Between the control cage 9 to be attached, the introduction tube 10 to be attached to the side 2b of the housing 2, and the attachment flange 3 and the hub 6. , And a bearing 12 in which a shock absorber 11 is disposed and incorporated in the inner peripheral portion of the mounting flange 3.

  The drive motor 4 is fixed to the mounting flange 3 fixed to the side portion 2a of the housing 2 by a bolt 13a and is supported by the upper wall 1 while being fixed by the bolt 13b. A drive motor provided with a plurality of bearings (not shown) that rotatably support the drive shaft 4a can be used. When the drive shaft 4a is rotatably supported by a bearing of a bearing unit that does not have a drive source, the drive motor 4 is connected to the bearing unit and an end of the drive shaft 4a. A pulley, a motor, a pulley connected to the rotating shaft of the motor, and a belt wound around the pulley of the drive shaft 4a and the pulley of the motor may be used.

  The impeller 7 is attached to the drive shaft 4a by a bolt 13c via a hub 6, and a side plate 14a on the drive shaft 4a side of the drive motor 4 and a predetermined width away from the introduction cylinder 10 by the side plate 14a. And a plurality of, for example, 4 to 12 blades 15 that are radially attached and fixed between the side plate 14a and the side plate 14b. The side plate 14a and the blade 15 are attached by bolts 13d. The side plate 14b has an opening larger than the outer periphery of the control cage 9 at the center, and the side plate 14b and the blade 15 have substantially the same inner peripheral end of the side plate 14b and the inner peripheral end of the blade 15. After being arranged, the bolts 13e are attached.

  The distributor 8 is a component for agitating the projection material, and is fixed to the side plate 14a by bolts 13f. The number of the slits (the number equal to the number of the blades 15, the number less than the number, or the number greater than the number). (Notches) 16 are provided at substantially equal intervals in the circumferential direction. That is, the distributor 8 in the present embodiment is a so-called comb in which the same number of claws 17 as the number of the blades 15 protrude from the base portion 8a in parallel to the central axis of the impeller 7 (left and right direction in FIG. 1). Although it has a tooth shape, the present invention is not limited to this, and the tip of the claw 17 can be reinforced by connecting it in the circumferential direction.

  The control cage 9 is a part that regulates the projection direction by a dispersion window 18 formed in the cylindrical portion of the front end portion 9a. The control cage 9 extends between the distributor 8 and the blade 15 and has a rear end portion. 9b is attached around the opening 19 formed in the side 2b opposite to the side 2a of the housing 2. That is, in the present embodiment, as a mounting structure of the control cage 9, a link-like flange (annular ring) 20 is first assembled to the opening 19, and then the step of the control cage 9 is mounted on the step of the flange 20. Are brought into contact with each other, and the introduction tube 10 is inserted through the seal plate 21. Finally, a ring-shaped pressing member 22 is attached and fixed to the side portion 2b with a bolt 13g. Thereby, the introduction cylinder 10 for supplying the projection material to the impeller 7 is also attached to the side portion 2 b together with the control cage 9.

  The shock absorber 11 has a shape that can be manufactured using a material appropriately selected from the group consisting of rubber, a resin material, and a damping metal material. O-rings are provided in a pair of annular grooves, which are grooves formed on the peripheral surface. Examples of the resin-based damping material that is the resin material include urethane-based, ester-based, and amide-based materials, and metal-based damping materials as the damping metal material include Mn—Cu alloy or Ni— There are Ti-based alloys. Further, the rubber, the resin material and the damping metal material can be combined. In the present invention, the structure of the arrangement and shape of the buffer body 11 is not limited to this. For example, the cushion body 11 is formed integrally with the outer peripheral surface of the outer ring of the bearing 12 and has a ring shape with a rectangular cross section. Or a structure in which an annular groove is formed on the outer peripheral surface of the outer ring and an O-ring or the like is provided in the annular groove, or a spiral groove is formed on the outer peripheral surface of the outer ring, and the spiral groove is molded and provided. Structure. The bearing 12 is a deep groove ball bearing having an iron plate seal or a rubber seal (not shown), and the outer ring is width-pressed using a ring-shaped width pressing member 23 fixed to the mounting flange 3 by a bolt 13h. ing. This bearing 12 has a fitting margin in which an annular groove is formed on the inner peripheral surface of the mounting flange 3, an O-ring is assembled to the annular groove, and the O-ring is elastically deformed by the outer ring of the bearing 12. The mounting flange 3 is fitted.

  In the present embodiment, the shock absorber 11 serves to prevent vibrations, and therefore reduces rotational vibrations of the drive motor 4 due to the rotational balance of the impeller 7 during high-speed rotation, so that the rotating parts of the drive motor 4, particularly The life of the bearing can be improved. Further, noise due to vibration generated in the housing 2 can be suppressed.

  The bearing 12 is a sealed deep groove ball bearing. In the present invention, a ceramic bearing of a ball bearing can be appropriately selected and used, but at least rolling elements among the components constituting the bearing. It is preferable to use a ball bearing in which is a ceramic ball. Moreover, although the said bearing 13 is a single row, it can also be made into a double row.

It is principal part sectional drawing of the centrifugal projection apparatus concerning one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper wall 2 Housing 2a, 2b Side part 3 Mounting flange 4 Drive motor 4a Drive shaft 5a Taper sleeve 5b Taper lock nut 6 Hub 7 Impeller 8 Distributor 8a Base part 9 Control cage 9a Tip part 9b Rear end part 10 Introducing cylinder 11 Buffer body 12 Bearings 13a to 13h Bolts 14a and 14b Side plate 15 Blade 16 Slit 17 Claw 18 Dispersion window 19 Opening portion 20 Flange 21 Seal plate 22 Holding member 23 Width holding member

Claims (8)

A housing;
A drive motor attached to the side of the housing via a mounting flange;
An impeller having a plurality of blades attached to a drive shaft of the drive motor via a hub;
A distributor attached coaxially to the drive shaft in the inner circumferential space of the impeller and having slits at substantially equal intervals in the circumferential direction;
A rear end portion is attached to the periphery of an opening formed on the other side portion facing the side portion of the housing, and a front end portion on which a dispersion window is formed is extended between the distributor and the blade. A control cage,
A centrifugal projection device comprising an introduction tube attached to the housing so as to supply a projection material to the opening,
A centrifugal projection device in which a cushion is disposed on an inner peripheral portion of the mounting flange and a bearing is incorporated between the mounting flange and the hub. The centrifugal projection device according to claim 1, wherein the buffer body is provided in a groove formed on an inner peripheral surface of the mounting flange. The centrifugal projection device according to claim 1, wherein the shock absorber is an O-ring provided in an annular groove formed on an inner peripheral surface of the mounting flange. The centrifugal projection device according to claim 1, wherein the buffer body is provided on an outer peripheral surface of the outer ring of the bearing. The centrifugal projection device according to claim 1, wherein the buffer is selected from the group consisting of rubber, a resin material, and a vibration-damping metal material. The centrifugal projection device according to claim 1, wherein the bearing is a ball bearing. The centrifugal projection device according to claim 6, wherein at least the rolling element is a ceramic ball among the components constituting the ball bearing. The centrifugal projection device according to claim 1, wherein the bearings are arranged in a double row.