JP2009214959A - Rotary type powdery and granular material delivery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary type powdery and granular material delivery device having both of controllability and a sealing property of a delivery amount as a delivery device for delivering granules with high strength like a delivery device of shot balls for shot-blasting. <P>SOLUTION: In this rotary type powdery and granular material delivery device, an upper rotor for adjusting a delivery amount of powdery and granular material and a lower rotor which discharges the powdery and granular material delivered from the upper rotor and is located below the upper rotor are provided. The upper rotor and the lower rotor are arranged in the same casing, and connected to each other with one driving device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a cutting device for cutting out high-strength particles such as powder particles, mainly shot blast shot balls.

  Conventionally, an apparatus as shown in FIG. 3 is used as a cutting apparatus for powders or granules (hereinafter referred to as powders). That is, as a granular material, the granular material 6 stored in the granular material tank 5 is quantitatively cut out by the rotary feeder 1 provided at the lower part of the granular material tank, and the injector 2 continuously provided at the lower part of the rotary feeder 1. It is cut out.

  An air pipe 3 for conveyance is connected to the injector 2, and the granular material 6 is accelerated in the injector 2 at high speed by the supplied high-pressure conveying air, and is conveyed by airflow through the granular material transport pipe 4. The

As shown in FIG. 4, the powder particles are cut out by the rotor 8 housed in the casing 9. The blade portion 11 constituting the rotor is installed to extend radially from the center of the rotary shaft 10 and fills the granular material 6 in a V-shaped pocket 12 formed between the blades, and the granular material is rotated by the rotation of the rotary shaft. Is cut out from the lower outlet 20.
In such a cutting device, the clearance between the blade tip of the rotor and the inner surface of the casing is limited to a minimum due to the gas seal.

  As another powder and particle cutting device, it improves the sealing performance consisting of a casing having a material supply port at the top and a material discharge port at the bottom, and a rotor having a blade that rotates inside and contacts the inner surface of the casing. A rotary feeder is disclosed in Patent Document 1.

The rotary cutting device as described above is also employed as a shot ball cutting device for shot blasting. Usually, a steel ball having a diameter of about 6 mm is used as a shot ball for shot blasting.
In the shot ball cutting device, the tank for storing the shot ball is normally opened to the atmosphere and is at atmospheric pressure, but the injector connected to the rotary feeder is 10 to 10 mm in order to transport a steel ball having a diameter of about 6 mm. The pressure is about 30 KPa. Therefore, the rotary feeder is required not only to control the cutting amount but also to have a gas sealing property.

JP-A-6-134760

  In the conventional rotary feeder, the gap between the rotor blade tip and the casing is normally suppressed to about 0.1 mm to 0.5 mm to ensure sealing performance. When the cutting material bites into the contact portion of the steel plate and the cutting material is as strong as a shot ball of a steel ball, the rotor cannot be rotated.

In addition, if a blade is installed at the tip of the rotor and the seal with the casing is reinforced, the blade cannot be worn, and the blade needs to be replaced.
Therefore, the present invention provides a cutting device having both controllability and sealing performance of a cutting amount as a cutting device that cuts out high-strength particles like a shot blast cutting device for shot blasting. For the purpose.

In order to achieve the above object, the present invention has the following structure.
That is, the present invention provides: (1) In a rotary type powder particle cutting device, an upper rotor that adjusts the amount of powder particles to be cut, and a powder particle that is positioned below the upper roller and cut from the upper rotor The lower rotor which discharges | emits is arrange | positioned in the same casing, These rotors were connected with one drive device, It is characterized by the above-mentioned.

(2) In the rotary-type granular material cutting device according to (1), the volume filling rate V1 of the upper rotor and the volume filling rate V2 of the lower rotor satisfy the following formula (1). And
V1> V2 (1)

  (3) In the rotary granule cutting device described in the above (1) or (2), the shape of the blade portion constituting the lower rotor is tangentially attached to the lower roller rotating shaft. Features.

An upper rotor that adjusts the amount of powder particles cut out, and a lower rotor that discharges powder particles cut out from the upper rotor are positioned below the upper rotor, and the upper rotor and the lower rotor are placed in the same casing. It is possible to control the cutting amount in proportion to the rotation speed and prevent biting by arranging in one and connecting with one drive device. Furthermore, the volume filling rate V1 of the upper rotor and the volume filling rate of the lower rotor By satisfying the following formula (1) with V2 and by providing the lower rotor blade shape in a tangential manner with respect to the rotating shaft, it is possible to reliably seal the shot ball without being caught. At the same time, the cutting amount can be controlled.
V1> V2 (1)

  The feature of the rotary feeder of the present invention is that it has both the controllability of the cutting amount and the sealing property. However, it is difficult to obtain such characteristics with a rotary feeder having a general structure, and it has been difficult to realize such characteristics especially for high-strength materials such as shot blast shot balls. In the present invention, this problem can be solved by configuring the rotor with two upper and lower rotors instead of one. That is, in the upper rotor 8b, the gap (gap) between the blade portion 11b and the casing 9a is increased to prevent biting and quantitative cutting performance rather than sealing performance, and the cutting amount of the rotor is controlled by the rotational speed. The method was adopted.

  On the other hand, the lower rotor 8a has a structure in which the gap with the casing 9a is suppressed or eliminated as in the conventional rotor in order to provide a sealing function, and the lower rotor 8a has a shot relative to the upper rotor 8b. By making the volume filling rate different so as not to be filled with materials such as spheres, in the lower rotor 8a, the material is not caught at the tip of the rotor blade portion 11a and the sealing performance can be secured. .

  Further, the blades 11a of the lower rotor 8a are arranged in a tangential manner rather than radially with respect to the rotating shaft 10a, so that the material 6 such as shot spheres discharged from the upper rotor 8b can be rotated in the lower rotor during the rotation process. Until the tip of the blade portion 11a of the 8a moves away from the contact sliding portion with the inner surface 91a of the casing 9a, the blade 11a rotates without remaining in contact with the casing and remaining at the bottom of the lower rotor 8a. Thereby, the material and the casing were rotated without being in contact with each other, and the wear of the rotor sliding portion of the casing could be suppressed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a rotary feeder according to the present invention. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is an explanatory view of a powder and particle cutting device, and FIG. 4 is a vertical cross-sectional view of a conventional rotary feeder.

In FIG. 1, an upper rotor 8b and a lower rotor 8a are rotatably provided in a casing 9a of the rotary feeder 1.
The upper portion of the upper rotor 8b is provided with an inlet portion 13 of a granular material (shot sphere) 6, and the gap between the casing 9a of the inlet portion and the tip of the upper rotor 8b blade portion 11b is not less than the maximum diameter of the shot sphere 6, The shot ball 6 is prevented from biting.
The pocket 12b formed by the upper rotor blade portion 11b is filled with a shot ball and falls to the lower rotor 8a while rotating. The shot ball 6 that has fallen on the lower rotor 8a has a volume discharge capacity larger than that of the upper rotor 8b so that the shot ball 6 enters the pocket portion between the rotor blade portions 11b but does not fill. For this reason, the gap between the tip of the lower rotor 8a blade portion 11a and the casing inner surface 91a can be adjusted to a small gap or no gap as usual, and a sealing property can be secured.

  The upper and lower rotors 8b and 8a are respectively fixed to rotary shafts (rotor shafts) 10b and 10a by keying 19, and a sprocket 14b is installed on one side of the upper rotor shaft 10b. A sprocket 14a is also installed on one side of the lower rotor shaft 10a of the lower portion 8a. The sprockets 14a and 14b are connected to the rotary drive device 16 via a transmission chain 15.

  As described above, since the upper and lower rotors are driven by the single rotation driving device 16, the volume capacity ratio is kept constant even if the rotation speed is changed. The lower rotor 8 a is supported by a lower rotor shaft 10 a that penetrates the casing 9 a, and the lower rotor shaft 10 a is supported by a bearing 17. At this time, since the carrier air pipe for conveying the shot ball 6 is connected to the discharge port 20 side of the lower rotor 8a, the carrier air pressure is applied. Therefore, the shaft through the casing through portion is sealed by the sealing device 18.

  The upper rotor 8 b is supported by an upper rotor shaft 10 b that penetrates the casing 9 a, and the upper rotor shaft 10 b is supported by a bearing 15. Since the shot ball 6 supply port 13 of the upper rotor 8b is connected to the shot ball tank 5 opened to the atmosphere, the casing through portion of the upper rotor shaft 10b does not need to ensure gas sealing performance.

  Further, the blade shape of the lower rotor 8a is tangentially arranged with respect to the rotating shaft 10a, and the volume discharge capacity of the lower rotor 8a is larger than that of the upper rotor 8b. The shot ball 6 inserted into the pocket 12a formed between the blades does not come into contact with the casing inner surface 91a while the lower rotor 8a blade portion 11a passes through the sliding surface of the casing inner surface 91a. No biting occurs.

The longitudinal cross-sectional view of the rotary feeder of this invention. AA sectional drawing of FIG. Explanatory drawing of a granular material cutting-out discharge apparatus. Conventional cutting device.

Explanation of symbols

1: Rotary feeder 2: Injector 3: Carrying air pipe 4: Granule transport pipe 5: Powder tank 6: Shot ball for powder / shot blast 7: Rotor tip and casing contact start part 8: Rotor 8a: Lower rotor 8b: Upper rotor 9: Casing 9a: Casing 91a: Inner surface 10: Rotating shaft 10a: Lower rotor (rotating) shaft
10b: Upper rotor (rotation) shaft
11: Blade portion 11a: Lower blade portion 11b: Upper blade portion 12: Pocket 12a: Lower pocket 12b: Upper pocket 13: Inlet portion 14: Sprocket 14a: Lower sprocket
14b: Upper sprocket 15: Transmission chain 16: Rotation drive device 17: Bearing 18: Seal device 19: Key clamp
20: Exit

Claims (3)

  In the rotary type granule cutting device, the upper rotor that adjusts the cutout amount of the granule and the lower rotor that is located under the upper roller and discharges the granule cut out from the upper rotor are the same. A rotary granule cutting device, which is disposed in a casing and is connected to these rotors by a single drive device. 2. The rotary granular material cutting device according to claim 1, wherein in the upper and lower rotors, the volume filling rate V1 of the upper rotor and the volume filling rate V2 of the lower rotor satisfy the following formula (1): .
V1> V2 (1) The rotary powder particle cutting device according to claim 1 or 2, wherein the shape of the blade portion of the lower rotor is tangentially attached to the lower roller rotation shaft.

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