JP5250862B2 - Rotary steel ball cutting device - Google Patents

Description

The present invention relates to a rotary steel ball cutting device that cuts out high-strength steel balls such as shot balls for shot blasting.

  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 the granular material 6 is filled in a V-shaped pocket 12 formed between the blades, and the granular material is rotated by 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.

The present invention, as the cutting device of the shot blasting shot ball, as cutting device for cutting a steel ball of high strength, a rotary cutting device that combines cutting of controllability and sealability at the same time The purpose is to provide.

In order to achieve the above object, the present invention has the following structure.
That is, the present invention includes (1) a rotary steel ball cutting device having a housing having a steel ball insertion portion at the upper end and a steel ball discharge portion at the lower end, and a vertical steel ball insertion portion. The lower half has a casing located in the upper part of the housing and a plurality of blades, is rotatably supported in the housing, and the lower semicircular part is opened in the housing during rotation, a large upper rotor gap than steel ball diameter and the inner peripheral surface of the blade tip and the casing is rotatably supported in a lower portion of the housing, and the lower rotor which slides the lower circumferential surface of said housing, said A rotary drive device that rotationally drives the upper rotor and the lower rotor in synchronization with each other is provided .

(2) In the rotary steel ball 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): To do.
V1> V2 (1)

(3) In the rotary steel ball cutting device according to (1) or (2) , the casing covers the delivery side and entry side pockets of the upper rotor while the upper rotor is rotating. And

An upper rotor for adjusting the cutting amount of the steel ball and a lower rotor for discharging the steel ball 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 housing . It is possible to control the cutting amount proportional to the rotation speed and prevent biting with one drive device, and further, the volume filling rate V1 of the upper rotor and the volume filling rate V2 of the lower rotor are the following (1) By satisfying the equation, the steel ball can be securely sealed without being caught, and the amount of cutting can be controlled.
V1> V2 (1)

  Since the lower circumferential surface of the housing is slid, leakage of the carrier air can be prevented.

  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 housing 9c 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. .

Furthermore, steel balls 6, such as by shot balls discharged from the upper rotor 8b is a rotation process to the blade portion 11a tip of the lower rotor 8a is separated from the contact sliding portion of the inner peripheral surface 91a of the casing 9a, casing and the It rotates without remaining in contact with 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 housing 9c of a rotary feeder. An upper portion of the upper rotor 8b is provided with an inlet portion 13 for the steel ball 6. 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 ball 6, Is prevented. The pocket 12b formed by the upper rotor blade portion 11b is filled with the steel ball 6 and falls to the lower rotor 8a while rotating. The steel ball 6 that has fallen into the lower rotor 8a has a volume discharge capacity larger than that of the upper rotor 8b so that it 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 14 a and 14 b are connected to the rotary drive device 16 via the 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 conveyance air pipe for conveying the steel ball 6 is connected to the discharge port 20 side of the lower rotor 8a, the conveyance 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 steel ball 6 supply port 13 of the upper rotor 8b is connected to the steel 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, since the volume discharge capacity increases towards the lower rotor 8a than the upper rotor 8b, steel balls 6 inserted into the pocket 12a formed between the blades of the lower rotor 8a is a lower rotor 8a wing portion 11a while passing through the sliding surface of the housing inner peripheral surface 91a, without contacting the housing inner peripheral surface 91a, thus does not occur biting steel balls 6.

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.

1: Rotary feeder 2: Injector 3: Carrying air pipe 4: Granule transport pipe 5: Powder tank 6: Steel ball 7: Rotor tip and casing contact start part 8: Rotor 8a: Lower rotor 8b: Upper rotor 9 : Casing 9a: Housing 9c: Housing inner peripheral surface 91a
10: Rotating shaft 10a: Lower rotor (rotating) shaft 10b: Upper rotor (rotating) shaft 11: Blade portion 11a: Lower blade portion 11b: Upper blade portion 12: Pocket 12a: Lower pocket 12b: Upper pocket 13: Entrance portion 14 : Sprocket 14a: Lower sprocket
14b: upper sprocket 15: transmission chain 16: rotary drive device 17: bearing 18: seal device 19: key stopper 20: outlet

Claims (3)

In the steel ball cutting device,
A housing having a steel ball insertion portion at the upper end and a steel ball discharge portion at the lower end;
A casing having a vertical steel ball insert, the lower half of which is located within the upper portion of the housing;
It has a plurality of blades, is rotatably supported in the housing, the lower semicircular portion is opened in the housing during rotation, and the gap between the blade tip and the inner peripheral surface of the casing is the diameter of the steel ball A larger upper rotor,
A lower rotor supported rotatably in a lower portion of the housing and sliding on a lower circumferential surface of the housing ;
A rotational drive device that rotationally drives the upper rotor and the lower rotor synchronously ;
A rotary steel ball cutting device characterized by comprising: Rotary steel ball cutting apparatus according to claim 1, characterized in that it comprises the a volume filling rate V1 of the upper rotor and the volume filling ratio of the lower rotor V2 by satisfying the following formula (1).
V1> V2 (1) The rotary steel ball cutting device according to claim 1 or 2, wherein the casing covers the delivery side and entry side pockets of the upper rotor during rotation of the upper rotor .

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