JP4536686B2 - Centrifuge chute casing - Google Patents

Description

  The present invention relates to a chute casing of a centrifuge that separates a slurry into solid and liquid using centrifugal force.

As this type of centrifuge, various types such as an extrusion type and a conical type as shown in Patent Documents 1 and 2 below have been conventionally known. The centrifuge is generally connected with a chute casing that feeds the dewatered cake to the next process after the dewatered cake from the centrifuge that has passed through the dewatered cake discharge pipe enters with the thrust applied. Has been. Further, the dewatered cake discharge pipe is connected to the side wall of the chute casing, and the dehydrated cake that has entered the chute casing in a state of thrust is formed in the chute casing by the opening of the dehydrated cake discharge pipe. It will collide with the inner surface facing the formed inner surface.
Japanese Patent No. 2936270 Japanese Patent No. 2542291

  However, in the chute casing of the conventional centrifuge, the dewatered cake that entered the chute casing in a state where thrust is applied may collide and adhere to the opposing inner surface of the chute casing. And when this accumulates, there existed a possibility that the inner side of a chute casing might block up.

  The present invention has been made under such a background, and provides a chute casing of a centrifuge that can prevent the inside of a chute casing from being blocked by a dewatered cake that has entered the chute casing. Objective.

  In order to solve the above problems and achieve the above object, the chute casing of the centrifuge of the present invention is connected to a centrifuge that separates solid and liquid using centrifugal force via a dewatered cake discharge pipe. The dewatered cake from the centrifuge that has passed through the dewatered cake discharge pipe enters with a thrust applied, and the centrifuge chute casing supplies this dewatered cake to the next process. In the chute casing, the dewatered cake can swing toward the front side and the rear side in the entry direction from the opening to the chute casing at a position facing the opening of the dewatered cake discharge pipe. And when it moves to the front side of this approach direction, the dehydrated cake receiving plate which can collide with the inner surface of the said chute casing is provided.

  According to this invention, since the dehydrated cake receiving plate is provided in the chute casing, the dehydrated cake that has entered the chute casing from the dehydrated cake discharge pipe collides with the inner surface of the chute casing. Without colliding with this dewatering cake backing plate. Therefore, at this time, due to the thrust received from the dehydrated cake, the dehydrated cake receiving plate is moved to the front side in the entry direction, and the dehydrated cake receiving plate is caused to collide with the inner surface of the chute casing, and the receiving plate is moved to the inner surface of the chute casing. Can be propagated to the dehydrated cake on the surface of the dewatered cake receiving plate. As a result, even if the dewatered cake colliding with the dewatered cake receiving plate tries to adhere to the dehydrated cake receiving plate as it is, the dehydrated cake can be dropped from the dehydrated case receiving plate by the impact force, and the inside of the chute casing It is possible to prevent the inside of the chute casing from being blocked by the dehydrated cake that has entered the box.

  Here, the surface of the dehydrated cake receiving plate facing the opening is formed in an arc shape that opens toward the opening, and the opening of the dehydrated cake discharge pipe is formed at both ends of the arc shape. A support shaft provided above the part and extending in the horizontal direction may be inserted and suspended.

  In this case, the above-described operational effects can be reliably achieved, and this configuration can be realized with a simple configuration. By providing the dewatered cake receiving plate, the centrifuge casing of this centrifuge has a high cost. Can be prevented.

  According to the chute casing of the centrifuge according to the present invention, the inside of the chute casing can be prevented from being blocked by the dewatered cake that has entered the centrifuge casing.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
The centrifuge 11 to which the chute casing 15 is attached includes an outer cylindrical basket 12 that rotates, an inner cylindrical basket 14 that is disposed coaxially thereto, an outer screen 16 that is fixed to the inner surface of the outer cylindrical basket 12, and an inner cylinder. The inner screen 18 is fixed to the inner surface of the basket 14, and the pushing mechanism 35 pushes the inner cylindrical basket 14 forward and scrapes the dewatered cake separated on the outer screen 16. A part of the pushing mechanism 35, the outer cylindrical basket 12, the inner cylindrical basket 14, the outer screen 16 and the inner screen 18 are provided inside the casing 10.

  The casing 10 is connected with a chute casing 15 for supplying the dehydrated cake to the next process after the scraped cake has passed through the dehydrated cake discharge pipe 13 after being scraped off. ing. The outer screen 16 and the inner screen 18 are respectively cylindrical wire screens or plate screens.

  The outer cylindrical basket 12 is attached to a first holding plate 12A provided at the tip of the main shaft 20, and an output of a motor (not shown) is transmitted to the pulley 22 to rotate the main shaft 20, whereby the outer cylindrical basket 12 and The outer screen 16 rotates around the axis of the main shaft 20.

An extrusion shaft 24 is inserted into the main shaft 20 with play, and a rear end thereof is attached to the piston 26. A second holding plate 14A is provided at the tip of the extrusion shaft 24, and the inner cylindrical basket 14 is attached to the holding plate 14A. The extrusion mechanism 35 is configured by the extrusion shaft 24, the piston 26, and the second holding plate 14A.
Furthermore, in the inner cylindrical basket 14, an extrusion plate 28 and a distributor plate 30 are provided in a state where the surfaces of the extrusion plate 28 and the distributor plate 30 are opposed to each other. The pushing plate 28 is fixed to the first holding plate 12A holding the outer cylindrical basket 12 via a plurality of support arms 36 that penetrate the second holding plate 14A with play. The distributor plate 30 is attached to the extrusion plate 28.

  Further, in the casing 10, a slurry supply pipe 32 that supplies a slurry to be processed is provided between the extrusion plate 28 and the distributor plate 30. Further, a cleaning liquid supply pipe 34 is provided for cleaning the dehydrated cake deposited on the outer screen 16 and the inner screen 18 by spraying the cleaning liquid.

  Here, as shown in FIG. 1, the dewatered cake discharge pipe 13 has a ring shape in plan view. The chute casing 15 extends in the vertical direction. The dewatered cake discharge pipe 13 is connected to the side wall of the chute casing 15 extending in the vertical direction, and the opening 13 a faces an inner surface 15 b described later on the side wall of the chute casing 15.

  That is, the dewatered cake that has entered the chute casing 15 through the opening 13a is directed from the inner surface 15a formed with the opening 13a toward the inner surface 15b facing the inner surface on the inner surface of the side wall of the chute casing 15. The chute casing 15 is entered.

  In the centrifuge 11 configured as described above, first, slurry is supplied from the slurry supply pipe 32 between the extrusion plate 28 and the distributor plate 30, and at this time, the outer cylindrical basket 12 and Since the outer screen 16 rotates and the support arm 36 penetrates the second holding plate 14A, the inner cylindrical basket 14 and the inner screen 18 are also rotated in the same direction.

  In the process of this rotation, the push shaft 24 moves back and forth in the axial direction of the main shaft 20 by the piston 26. Then, when the retracted inner cylindrical basket 14 advances, the pushing portion 14a at the front end thereof slides on the inner peripheral surface of the outer screen 16, and scrapes the dewatered cake accumulated on the outer screen 16 forward. Then, it is discharged into the casing 10 from its tip.

  When this discharge is completed, the inner cylindrical basket 14 is moved back to the original position shown in the figure. While the inner cylindrical basket 14 is continuously supplied with slurry, it performs solid-liquid separation on the inner screen 18 on its inner surface, and part of the slurry moves to the outer screen 16, and solid-liquid separation also occurs on the outer screen 16. Is made. The filtrate on the screens 16 and 18 is discharged into the casing 10 through the through holes of the baskets 12 and 14.

  In the above process, the dehydrated cake discharged into the casing 10 sequentially passes through the dehydrated cake discharge pipe 13, and then the dehydrated cake is passed through the opening 13a and chute in a state where thrust is applied. It enters the casing 15 and is discharged from the chute casing 15 to the next process.

  And in this embodiment, as FIG. 3 shows, in the chute casing 15, in the position which opposes the opening part 13a of the dewatering cake discharge pipe 13, the said dehydrating cake enters the chute casing 15 from the said opening part 13a. There is provided a dewatering cake receiving plate 17 that can swing toward the front side and the rear side in the approach direction F and that can collide with the inner surface of the chute casing 15 when moved to the front side in the approach direction F. Yes. When the dewatered cake receiving plate 17 moves to the front side in the entry direction F, it collides with an inner surface 15b of the inner surface of the chute casing 15 facing the inner surface 15a formed with the opening 13a.

  The dewatering cake receiving plate 17 is formed in an arc shape such that the surface 17a facing the opening 13a opens toward the opening 13a, and the dehydrating cake receiving plate 17 is dehydrated at both end openings 17b in the arc shape. A support shaft 13c provided above the opening 13a of the cake discharge pipe 13 and extending in the horizontal direction is inserted and suspended. In other words, the dewatered cake receiving plate 17 is a half-circular tube having a smaller diameter than the inner diameter of the chute casing 15 and is disposed substantially coaxially with the chute casing 15. The dewatering cake receiving plate 17 has a support shaft 13c inserted through the opening 17b at both ends at the upper end in the axial direction, and a lower portion in the axial direction of the surface 17a faces the opening 13a formed in the chute casing 15. is doing.

  Accordingly, when the dewatered cake discharged into the casing 10 enters the chute casing 15 from the opening 13a of the dewatered cake discharge pipe 13 and collides with the surface 17a of the dewatered cake receiving plate 17, the support shaft 13c. , And when it moves to the front side in the approach direction F, it collides with the opposing inner surface 15b on the side wall of the chute casing 15 as shown by a two-dot chain line in FIG. Yes.

  In this embodiment, the dewatered cake that has entered the chute casing 15 collides with the lower portion in the axial direction on the surface 17a of the dewatered cake receiving plate 17, and the lower portion swings toward the front side and the rear side in the approach direction F. At the same time, the rear surface of the lower portion of the dewatered cake receiving plate 17 collides with the opposing inner surface 15b of the chute casing 15 when moving to the front side in the entry direction F.

  As described above, according to the chute casing 15 of the centrifuge 11 according to the present embodiment, since the dehydrated cake receiving plate 17 is provided in the chute casing 15, the dehydrated cake discharge pipe 13 and the inside of the chute casing 15 are provided. The dehydrated cake that has entered in a state where thrust is applied to the surface does not collide with the opposed inner surface 15 b of the chute casing 15 and collides with the surface 17 a of the dehydrated cake receiving plate 17. Accordingly, the dewatering cake receiving plate 17 is moved to the front side in the entry direction F by the thrust received from the dewatering cake at this time, and the back surface of the dewatering cake receiving plate 17 collides with the opposing inner surface 15b of the chute casing 15. Thus, the impact force received by the receiving plate 17 from the opposed inner surface 15b of the chute casing 15 can be propagated to the dehydrated cake on the surface 17a of the dehydrated cake receiving plate 17. As a result, even if the dewatered cake colliding with the dewatered cake receiving plate 17 tries to adhere to the surface 17a of the dehydrated cake receiving plate 17 as it is, the dehydrated cake can be dropped from the dehydrated case receiving plate 17 by the impact force. Thus, it is possible to prevent the inside of the chute casing 15 from being blocked by the dewatered cake that has entered the chute casing 15.

  Further, the dewatered cake receiving plate 17 has an arc shape such that a surface 17a facing the opening 13a of the dewatered cake discharge pipe 13 facing the chute casing 15 opens toward the opening 13a. Since the support shaft 13c provided above the opening 13a of the dewatered cake discharge pipe 13 is inserted into and suspended from the both-end openings 17b in the arc shape, the above-described operational effects are reliably exhibited. In addition, this configuration can be realized with a simple configuration, and the provision of the dewatered cake receiving plate 17 can prevent the chute casing 15 of the centrifuge 11 from becoming expensive.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the dehydrated cake receiving plate 17 has a configuration in which the surface 17a facing the opening 13a has an arc shape that opens toward the opening 13a. For example, it may be a flat plate, and its shape is not particularly limited. Further, the dewatering cake receiving plate 17 is suspended by being inserted into both end openings 17b of the circular arc shape through a support shaft 13c provided above the opening 13a of the dewatering cake discharge pipe 13 and extending in the horizontal direction. However, the present invention is not limited to this configuration.
Furthermore, in the said embodiment, although the circular pipe was shown as the chute casing 15, for example, a square pipe may be sufficient and the cross-sectional shape is not specifically limited.
Furthermore, in the said embodiment, although the extrusion type | mold was shown as the centrifuge 11, it can replace with this, for example, can apply also to a conical type | mold, and the form of the centrifuge 11 is not specifically limited.

  It is possible to prevent the inside of the chute casing from being blocked by the dehydrated cake that has entered the chute casing.

It is a schematic block diagram which shows the chute | shoot casing of the centrifuge shown as one Embodiment of this invention. It is a partial cross section side view of the centrifuge shown in FIG. It is a partial cross section perspective view of the chute casing shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Casing 11 Centrifugal separator 12 Outer cylindrical basket 13 Dehydrated cake discharge pipe 13a Opening part 13c Support shaft 14 Inner cylindrical basket 15 Chute casing 15b Inner surface 16 Outer screen 17 Dehydrated cake receiving plate 17a Surface facing the opening 17b Opening at both ends 18 Inner screen 35 Extrusion mechanism F Approach direction

Claims (2)

It is connected to a centrifuge that separates solid and liquid using centrifugal force through a dehydrated cake discharge pipe, and the dehydrated cake from the centrifuge that has passed through the dehydrated cake discharge pipe is given thrust. A centrifuge casing for feeding the dehydrated cake to the next process,
In this chute casing, the dewatered cake can be swung toward the front side and the rear side in the entry direction from the opening to the chute casing at a position facing the opening of the dewatered cake discharge pipe, and A centrifuge casing for a centrifuge, wherein a dewatering cake receiving plate is provided that is capable of colliding with the inner surface of the chute casing when moved to the front side in the approach direction. In the chute casing of the centrifuge according to claim 1,
The dehydrated cake receiving plate has a surface facing the opening having an arc shape that opens toward the opening, and the opening at both ends of the arc shape is more than the opening of the dehydrated cake discharge pipe. A chute casing for a centrifuge, wherein a support shaft provided above and extending in a horizontal direction is inserted and suspended.

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