JPH08628B2 - Shaft seal device for circle feeder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for an upright rotary shaft in a circle feeder for powder particles.

[0002]

2. Description of the Related Art In a conventional powder granule circle feeder, an outer cylinder shaft 30 is added to an upright rotary shaft 6 as shown in FIG. 5, and a small diameter shaft 31 provided at the upper end of the outer cylinder shaft 30 is provided above the bottom plate 3. The cap 32 having the same outer diameter as the outer cylinder shaft 30 is fixed to the small-diameter shaft 31 in the rotational direction by the key 33, and is fitted into the cap 32 through the boss 34.
13 is provided, and a shaft seal 36 by ground packing is interposed in a vertical gap between the outer cylinder 35 fixed to the lower surface of the bottom plate 3 and the outer cylinder shaft 30.

However, since it is a seal in the vertical direction, powder particles easily enter between the through hole 4 of the bottom plate 3 and the outer cylinder shaft 30,
Once entered, it cannot be removed and the shaft seal 36
Maintenance is required because it easily leaks downwards, and regular retightening and packing replacement are required. In addition, since the shaft seal 36 is long in the vertical direction, the machine height is high and it is difficult to simplify the structure. There was a problem.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shaft seal device of the above-mentioned circle feeder, in which a powder or granular material hardly enters and leaks into the seal portion, is maintenance-free, and has a low machine height and a simple structure.

[0005]

In order to achieve the above-mentioned object, the present invention provides a machine frame with inner and outer cylinders concentrically with an annular gap, and has a bottom plate on the outer cylinder and a lower end peripheral edge of the inner cylinder. A material discharge gap is provided between the base plate and the bottom plate, a material discharge port is provided in the annular space, and an upright rotation shaft is inserted through a through hole formed in the center of the bottom plate, and the rotation shaft is integrated in the rotation direction. In a circle feeder in which a cap that has been converted is fitted, a spoke is provided on the bottom plate through a boss on the cap, and an outer end of the spoke is connected to a rotary scraping ring along the inner surface of the outer cylinder, A bearing for the rotary shaft is arranged below the through hole, a washer fitted to the through hole is supported on the bearing, a lower surface of the cap is arranged above the washer, and a central portion is arranged on an upper surface of the washer. A circular step with a high portion is formed, and a dustproof sleeve that contacts the step between the washer and the boss. A shaft sealing device in a circle feeder having a groove interposed therebetween. The invention described above in which an outwardly opening V-shaped ring is interposed between an upper surface of the washer and a downward bottom surface of a circular groove provided on the lower surface of the cap. It is constituted by the shaft seal device in the described circle feeder.

[0006]

The powder / granular material 17 is supplied into the inner cylinder 1, and the powder / granular material 17 is naturally discharged from the material discharge gap t to the annular space 15.
This is moved by the rotary scraping ring 14 along the gap 15 and discharged from the material discharge port 16.

In the present invention, since the cap 8 and the boss 9 rotate in accordance with the rotation of the upright rotation shaft 6, the powder particles 17 near the boss 9 are centrifugally separated from each other between the upper surface of the washer 5 and the lower surface of the boss 9. Are difficult to enter, and those that have entered are blocked by the dust-proof ring 10 and further blocked by the circular step 5 ′, so that they cannot leak beyond this to the center. Even if it leaks to the central portion, it is blocked by the V-shaped cross-section ring 12 between the upper surface of the washer 5 and the lower surface of the cap 8.

The bearing 7 can be arranged directly below the through hole 4 via the washer 5, and the distance between the upper surface 7'of the bearing 7 and the lower surface of the bottom plate 3 can be kept small.

[0009]

EXAMPLE An outer cylinder 2 is provided on a machine frame 19, and a bottom plate 3 is provided at the lower end thereof.
To provide. The inner cylinder 1 is concentrically provided on the upper end of the outer cylinder 2 via an inner flange 2 ', and the annular space 15 is interposed between the inner and outer cylinders 1 and 2 by the flange 2'. A material discharge gap t is provided between the lower end peripheral edge 1 ′ of the inner cylinder 1 and the bottom plate 3 so that the granular material 17 supplied into the inner cylinder 1 is naturally discharged into the gap portion 15. The bottom plate 3 or the outer cylinder 2 of the space 15
A material discharge port 16 is opened, a vertical rotation shaft 6 is inserted into a concentric through hole 4 formed in the center of the bottom plate 3, and a cap 8 integrated in the rotation direction by a key 6'is inserted into the rotation shaft 6 And the lower surface of the cap 8 is placed on the upper surface of the washer 5. The cap 8 is provided with spokes 13 and 13 on the bottom plate 3 via bosses 9, and the outer ends of the spokes 13 and 13 are connected to a rotary scraping ring 14 arranged along the inner surface of the outer cylinder 2. , The inside of the ring 14 is evenly spaced.
4'is provided to form the circle feeder 18 of the powder or granular material 17.

Immediately below the through hole 4, an upper surface 7'of the bearing 7 is arranged closely, and a circular washer 5 is supported on the upper surface 7 '.
An outer peripheral step 5 ″ of the washer 5 is fitted into the through hole 4, and the washer 5 is extended from the outer peripheral step 5 ″ to the lower surface of the bottom plate 3 to form an extension portion 20.
Is fixed to the bottom plate 3 with bolts 21 and nuts 22.
The upper surface of the washer 5 is provided in the same plane as the upper surface of the bottom plate 3, but the central portion is formed slightly higher through the circular step 5 '.

Circular grooves 11 and 23 are formed on the lower surfaces of the cap 8 and the boss 9, respectively, and a dustproof ring 10 made of plastic, metal or other material is fitted in the circular groove 23 on the boss 9 side, and the lower surfaces thereof are fitted. It is brought into contact with the upper surface of the washer 5 and also with the circular step 5 '. Further, a V-shaped cross-section ring 12 opened outward is fitted in the circular groove 11 on the side of the cap 8, and the V-shaped ring 12 is brought into contact with the downward bottom surface 11 ′ of the groove 11 and the upper surface of the washer 5. Is.

Reference numeral 24 in the drawing denotes a collar fitted between the inner periphery of the washer 5 and the upright rotary shaft 6, 25 is a drive reduction motor for the rotary shaft 6, and 26 is a rotary shaft 6 for the rotary shaft 6. Input train,
Reference numeral 27 is a drive belt for the adjusting wheel 26, 28 is an up-and-down adjusting tube on the lower end peripheral edge 1'of the inner tube 1, and 29 is an up-and-down adjusting bolt.

[0013]

Since the present invention is constructed as described above, in the circle feeder 18, a gap is formed between the outer peripheral surface of the upright rotating shaft 6 and the inner peripheral surface of the washer 5 fitted into the through hole 4 of the bottom plate 3. Can be closed by the cap 8, and by the action of the centrifugal force due to the rotation of the cap 8 and the boss 9, not only the entry of the powdery or granular material 17 into the gap can be prevented but also the dust-proof ring 10 and the circular step 5 '. It is possible to prevent the granular material 17 from entering. Therefore, not only maintenance of the shaft seal is free, but also the machine height can be formed low and the structure can be simplified.

Further, the granular material 17 entering beyond the dust-proof ring 10 and the circular step 5'is blocked by the V-shaped cross-section ring 12 and there is no possibility of downward leakage along the upright rotating shaft 6.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a circle feeder equipped with a shaft seal device of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is a plan view of a bottom plate.

FIG. 5 is a cutaway front view of a conventional circle feeder.

[Explanation of symbols] 1 inner cylinder 2 outer cylinder 3 bottom plate 4 through hole 5 washer 5'circular step 6 upright rotating shaft 7 bearing 8 cap 9 boss 10 dust-proof ring 11 circular groove 11 'downward bottom surface 12 cross-section V-shaped ring

Claims (1)

[Claims] 1. An inner / outer cylinder is concentrically provided on a machine frame via an annular gap portion, a bottom plate is provided on the outer cylinder, and a material discharge gap is provided between a lower end peripheral edge of the inner cylinder and the bottom plate. A material discharge port is provided in the space, an upright rotation shaft is inserted through a through hole formed in the center of the bottom plate, a cap integrated with the rotation shaft is fitted to the rotation shaft, and a boss is attached to the cap. In a circle feeder in which spokes are provided on a bottom plate through which the outer ends of the spokes are connected to a rotary scraping ring along the inner surface of the outer cylinder, the bearing of the rotary shaft is arranged below the through hole. Supporting a washer fitted in the through hole on the bearing, arranging a lower surface of the cap on an upper portion of the washer, and forming a circular step having a high central portion on an upper surface of the washer, the washer and the boss. Ri Na with intervening dustproof ring in contact with the stepped between, and the
Under the circular groove on the upper surface of the washer and the lower surface of the cap
Insert a ring with a V-shaped cross section that opens outwardly from the bottom face.
Shaft sealing device in the circle the feeder comprising Te.