JPS6232599Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mass transfer device that transfers substances by rotating a rotating blade, and in particular, a wear-resistant chip is attached to the tip of the rotating blade to apply heat to the tip. The present invention relates to a mass transfer device that can be easily and reliably installed without any problems, and also allows easy replacement of these chips.

[Conventional technology]

As devices for moving substances by rotating rotating blades, screw conveyors, screw decanter type centrifuges, etc., in which screw blades are used as rotating blades, are known. In such devices, the tips of the rotating blades are prone to wear, so countermeasures are taken such as adding wear-resistant material to the tips or attaching wear-resistant chips. As a structure for attaching the chip to the rotating blade, a structure as shown in FIGS. 1 to 3, for example, is adopted.

[Problem that the invention attempts to solve]

That is, the one shown in Fig.
No.), the chip 2 is bonded to the tip of the rotary blade 1 with adhesive, and the chip 2 is further fixed in a reinforcing manner by a stopper member 3 and a presser member 4 attached to the rotary blade. . However, since this structure uses adhesive, there is a problem that the adhesive may be eroded depending on the nature of the substance to be moved. 4 alone would not be sufficient to secure the chips 2, and there was a risk that the chips 2 would be scattered by the centrifugal force caused by the rotation of the rotating blades, damaging the device. Furthermore, when replacing the chip 2, it is necessary to clean the adhesive surface, which requires special treatment, making it difficult to replace it on site.

On the other hand, the one shown in Figure 2 (Special Publick Publication No. 51-41707
No.), a piece 6 to which a chip 5 is integrally fixed is attached to the rotating blade 1 by welding. However, in this structure, the chip 5 must be replaced by peeling off the welded part and replacing each piece 6, and the mounting surface of the piece 6 must be ground with a grinder to improve the mounting accuracy. Ta. For this reason, not only is it time-consuming to replace the chips, but the rotating blades are easily damaged by the grinder, and there is also a risk that the balance of the rotating body (rotating blades) may be lost. Furthermore, since the chip 5 is directly welded though through the piece 6,
It is easily affected by welding heat and there is a risk of cracking, so the materials available are limited.

FIG. 3 shows a solution to this problem (Japanese Patent Application Laid-open No. 51-86870), in which chip mounts 7 are attached to the rotating blade 1, and these chip mounts 7
A chip 8 is removably attached across the gap via a dovetail joint 9. However, in this structure, since the amount of protrusion of the chips 8 changes depending on the width between the chip mounts 7, it is difficult to mount the chips 8 with high accuracy.

The present invention has been devised in view of the various problems mentioned above in order to solve them all at once. The purpose of the present invention is to provide a material that allows wear-resistant chips to be easily and reliably attached to the tips of rotating blades without causing any thermal effects, and with high precision, and that allows these chips to be easily replaced. To provide mobile devices.

[Means for solving problems]

In order to achieve the above object, the present invention provides a mass transfer device that moves a substance by the rotation of a helical rotary vane, which has a tip mounting portion having an engagement receiving portion extending radially inward at the peripheral edge of the rotary vane. In addition to fixing the members by welding, a presser plate for holding the base end of the wear-resistant chip attached to the rotary blade with the tip protruding from the peripheral edge thereof is welded and fixed, and the tip mounting member and the presser plate are fixed by welding. The chip, which has an engaging protrusion that engages with the engaging receiving part, is attached to the rotating blade so that it can slide freely in the circumferential direction.

[Effect]

Since the chips are not directly welded, there is no thermal effect on the chips, and the chip mounting member and presser plate restrict movement of the chips in the radial direction, improving mounting accuracy. In particular, since the tip is attached so as to be slidable in the circumferential direction, the tip can be easily replaced by sliding it by simply removing one portion of either the tip mounting member or the presser plate.

〔Example〕

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 4 showing a screw decanter centrifuge as a mass transfer device, 10 is a cylindrical outer shell having a truncated conical portion 10a at one end, and this outer shell 10 rotates via bearings 11 at both ends. freely supported. Inside the outer shell 10 is an inner shell 12.
is rotatably provided, and a spiral rotating blade 13 is attached to the outer circumferential wall of the inner shell 12 and extends to approach the inner circumferential wall of the outer shell 10. One ends of the inner shell 12 and the outer shell 10 are connected to each other via a speed reducer 14, so that the inner shell 12 and the outer shell 10 rotate at a different speed. Inner body 12
At the other end is an introduction pipe 1 for introducing the liquid to be treated.
5 is connected to the inner shell 12, and a liquid to be treated outlet 16 is connected to the inner shell 12 for discharging the introduced liquid to be treated into the outer shell 10.
is formed.

On the other hand, the truncated conical portion 10a of the outer body 10 has a solid content discharge port 1 for discharging centrifuged solid content.
7, and a moisture outlet 18 for discharging moisture is formed at the rear end portion on the opposite side. That is, the solids pushed to the inner circumferential wall of the outer shell 10 by centrifugal force are scraped and transferred to the solids discharge port 17 by the rotating blades 13.
Note that 19 is a casing provided to cover the outer circumferential portion of the outer shell 10 and for separately receiving and discharging the waste discharged from the respective discharge ports 17 and 18.

The tip of the rotary blade 13 is easily worn out due to contact friction with solid matter, and therefore a wear-resistant chip 20 is attached thereto, and the present invention is characterized by its attachment structure. 5 and 6 show the mounting structure, and as shown, the tip 20 is attached to the tip of the rotary blade 13 by a tip attaching member 21 and a holding plate 22.

The tip attachment member 21 is made of a metal piece having a predetermined length and a hook-shaped cross section, which is attached along the tip of the rotary blade 13, and is attached to the end surface of the rotary blade 13 so as to engage with each part of one of the tips of the rotary blade. It has a surface 21a that comes into close contact with the rotating blade 13a (this is called a first contact surface) and a surface 21b that comes into close contact with the flat part 13b of the rotating blade 13 (this is called a second contact surface). An engagement receiving part 23 for slidably engaging the chip 20 in the circumferential direction of the rotary blade 13 is provided on the edge of the tip mounting member 21 on the second contact surface 21b side. It is formed along the
This engagement receiving portion 23 is a flat portion 13b of the rotating blade 13.
It has a V-shaped groove in cross section.

On the other hand, the tip 20 is a rectangular tip having approximately the same length as the tip attachment member 21, and is attached to the flat portion 13b of the rotary blade 13 with its tip 20a slightly extending from the tip. A circular arc-shaped engagement protrusion 24 that engages with the engagement receiving portion 23 is formed in a portion corresponding to the tip attachment member 21. Further, the proximal end (more specifically, the rear end) 20b of the tip 20 has an engaging protrusion 24.
It is formed in the shape of a concentric arc.

The presser plate 22 is formed into an arcuate shape that engages with the proximal end 20b of the tip 20 to press it, and has a hook-like cross section.

Therefore, in order to attach the tip 20 on the rotating blade 13, first, the tip mounting members 21 are attached to the tip of the rotating blade 13 by welding so that they are lined up in series along the tip of the rotating blade 13. The engagement protrusions 24 of the tips 20 are respectively engaged with the engagement receiving sections 23 of the tip attachment members 21, and the presser plates 22 are engaged with the proximal ends 20b of the respective tips. Rotating blade 1
It may be attached to the flat part 13b of No. 3 by welding.
That is, since the chip 20 is not attached by welding but is fixed via the chip attachment member 21 and the presser plate 22, the chip 20 can be easily and reliably attached to the tip of the rotary blade 13 without having any thermal effect on it. Can be installed on. in this case,
The tip 20 has its engagement protrusion 24 engaged with the engagement receiving section 23 of the tip mounting member 21 and its base end 20b engaged with the presser member 22, thereby restricting the radial movement of the rotary blade 13. , the protruding length of the tip end portion 20a can be made constant, and the mounting accuracy is improved. Further, when replacing the chip 20, the chip 20 can be easily replaced by removing the chip mounting member 21 or the holding plate 22 that fixes the chip 20. In this case, since no adhesive is used to fix the chip 20, there is no need to treat the chip mounting surface, making it easy to replace the chip on site. In addition, since the chip mounting surface is not welded, there is no need to grind it with a grinder to increase the mounting accuracy.
The rotating blade 13 will not be damaged. Furthermore,
The tip 20 is connected to the engagement receiving portion 23 of the tip mounting member 21.
Since it is slidably attached in the circumferential direction of the rotary blade 13 by the holding plate 22, if one part of the tip mounting member 21 or the holding plate 22 is removed, the chips 20 in the vicinity can be slid and removed one by one. This makes it possible to quickly and easily replace a wide range of chips.

In addition, in order to increase the strength of the chip mounting member 21, as shown in FIG.
They may be joined together by welding 25. In addition, in order to make it easier to replace the chip 20,
As shown in FIGS. 8 and 9, a spacer 26 may be interposed between the presser plate 22 and the base end 20b of the tip 20. The spacer 26 can slide in the same direction as the tip 20, and
The tip 20 can be attached and detached through a notch (not shown) formed in the tip 2, and by removing the spacer 26, the tip 20 can be easily removed. In FIG. 9, the shape of the spacer 26 is made simpler than that in FIG. Furthermore, the tip 20 is not limited to being an integrally molded product, and as shown in FIG.
8 may be fixed by brazing or the like.

Note that the mass transfer device is not limited to the screw decanter type centrifugal separator, but can of course be applied to screw conveyors, mixers, and the like.

[Effect of idea]

In summary, the present invention provides the following excellent effects.

(1) The wear-resistant chips are attached to the peripheral edge of the rotary vane using a chip mounting member and a holding plate instead of using adhesive or direct welding, so there is no heat effect on the chips. The installation can be done easily and reliably.

(2) Since movement of the chip in the radial direction of the rotating blade can be restricted by the chip mounting member and the presser plate, the accuracy of chip mounting can be improved.

(3) In particular, since the tip is attached by engaging with the tip mounting member and the holding plate, the tip can be replaced by simply removing either the tip mounting member or the holding plate. Since it can be slid in the circumferential direction of the rotating blade, a wide range of chips can be easily replaced by simply removing one part of the chip mounting member or presser plate.

[Brief explanation of the drawing]

FIGS. 1 to 3 are explanatory diagrams showing different conventional chip mounting structures, FIG. 4 is a sectional view showing an embodiment of the present invention applied to a screw decanter type centrifuge, and FIG. FIG. 6 is an enlarged sectional view taken along the line A-A in FIG. 9th
The figures are cross-sectional views showing different modifications in which spacers are interposed between the holding plate and the proximal end of the tip.
FIG. 10 is a side view showing a modified example of the chip. In the figure, 13 is a rotating blade, 20 is a wear-resistant chip, 21 is a chip mounting member, 22 is a presser plate, 23
24 is an engagement receiving portion, and 24 is an engagement protrusion.

Claims (1)

[Scope of utility model registration request] In a mass transfer device that moves a substance by the rotation of a helical rotating blade, a tip mounting member having an engagement receiving portion extending radially inward is fixed to the peripheral edge of the rotating blade by welding, and the tip mounting member is fixed to the rotating blade by welding. A presser plate is welded and fixed to hold the base end of the wear-resistant chip that is mounted with the tip protruding from the peripheral edge, and is engaged with the engagement receiving portion between the chip mounting member and the presser plate. A mass transfer device, characterized in that the above-mentioned tip having an engaging protrusion is attached to a rotary blade so as to be slidably engaged therewith in a circumferential direction.