JPS58119362A - Structure for protecting leading end of screw flight of horizontal type centrifugal separator - Google Patents

Abstract

PURPOSE:To enable the attachment and detachment of a protective piece simply, by providing a protective plate having an L-shaped cross area comprising an anti-wear base material to the leading end part of a screw flight in a detachable manner. CONSTITUTION:A protective piece 15 consists of a protective plate 9 having an L-shaped cross area formed by sintering tungsten carbide and an attaching pedestal 16 attached to the corner part B of the protective plate 9. To the attaching side surface 16 of the attaching pedestal 16, bolts 17, 17 for attaching the protective piece 15 are integrally provided. On the other hand, in the vicinity of the top part of a screw flight 5a, piercing holes 19, 19 for passing the bolts 17, 17 are provided by drilling so as to be corresponded to respective bolts. The protective piece 15 is successively attached along the peripheral flange of the screw flight 5a and arranged so as to cover the solid substance conveying side surface 5b and the leading end side of the screw flight 5a with the protective plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tip shoulder retention structure for a screef flight provided in a horizontal centrifuge, and more specifically, the present invention relates to a tip shoulder retention structure for a screef flight provided in a horizontal centrifuge, and in particular, the tip of the scree and fin is made of a cross-sectional shape made of a wear-resistant material. It is made up of removably attached plates.

Figure 1 shows horizontal centrifugation 11! This is a partially cut away perspective view illustrating the sludge, which is widely used as a dewatering device for various types of sludge and solid-liquid mixtures other than sludge. In the figure, 1 is a cover, 2 is a rotating drum, and is formed from a cylindrical bowl part 3 and a conical bowl part 4. 5 #i screw, 6 is a one-liquid mixture inlet pipe, 7 is a clarified tIL outlet, 8 is a solids outlet, and the rotary drum 2 and screw 5 are rotated at high speed in the same direction with a slight difference in rotational speed. Solid-liquid separation is performed by That is, when the solid-liquid mixture is supplied from the solid-liquid mixture inlet W6 while rotating the rotating drum 2 and the screw 5t at high speed,
The mixture flows into the space between the screw 5 and the rotating drum 2 through the inlet hole 13 through the inner cavity of the screw 5 . The solids in the solid-liquid mixture are then moved to the rotating drum 2 by centrifugal force.
The solid material is pressed against the inner wall of the solid material discharge port 8, and further receives the feeding force from the screw 5, and is transferred along the inner wall of the conical bowl portion 4 toward the right in the drawing, and is taken out from the solid material discharge port 8. On the other hand, the liquid forms a constant water level in the box 3, passes through the communication hole 14t formed on the left side of the drawing, and overflows from the clear liquid discharge lower.

By the way, since the centrifugal separator I75L+5 is rotated at high speed by a high-output motor and comes into contact with a large amount of solid matter, an excessive frictional force is applied to the vicinity of the tip of the screw flight 51. Therefore, screw fly)
5m is worn out and after long-term use, the tip gradually becomes thinner, and the clearance between the inner wall of the single-rotation drum 2 and the tip of the scraping tool daft 51 becomes large, and the solids conveyance capacity of the centrifuge decreases. This impairs the solid-liquid separation efficiency.

As a countermeasure to these problems, it has been considered to apply a wear-resistant treatment to the screw flights 5m by overlaying or thermal spraying a cemented carbide whose main component is tungsten carbide, for example, on the screw flights 5a.

When the hard-metal layer of cemented carbide is formed thickly, it tends to crack due to bond impact, and the surface of the built-up layer formed by 1m contact or bath spraying is generally rough and has an uneven structure. Therefore, the wear resistance performance is not as great as expected.For example, as shown in Figure 2,
A method is used in which a protective piece 11 is formed by brazing a tile-shaped ultra-hard material 9f obtained by sintering tungsten carbide or the like to a mounting pedestal 10, and welding the protective piece 11t to the periphery of a 5m screef light. There have been times when
The protective piece 11 attached by this method is made of cemented carbide and has better wear resistance than the fleshy layer, and can be used for a relatively long period of time, but it still wears out gradually. Therefore, in order to maintain the solid-liquid separation efficiency at a high level, it is desirable to periodically replace the protective heath 11 with a new one. However, when replacing the protective piece 11, the only way to remove the protective piece 11 is to remove the protective piece 11 by forcefully hitting it with a jig such as a chisel or the like at the contact point A of the screw fitting 5a and the piece 11O, which makes the removal work extremely complicated.

As mentioned above, using a chisel or the like to hit the screw hard may cause irreparable damage to the 5m screw flight and the vicinity of its tip. Moreover, since the protective piece 11 is attached by #i contact, there is a drawback that replacement work cannot be performed in a place without equipment such as a welding machine.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a structure that allows a protective piece to be easily attached and detached.

In other words, the film-retaining structure at the tip of the screef light of the present invention includes a mounting pedestal fixed to the corner part of an L-shaped protection plate made of a wear-resistant material, and a mounting pedestal having a structure protruding in the opposite direction to the protection plate. At the same time, a bolt through hole is formed near the top of the screw flight near the solids discharge port side of the horizontal centrifuge, and the mounting pedestal is attached to the solids exit side of the wrinkled screw flight. The overall gist of the present invention is that the bolt is passed through the bolt through hole and fastened with a nut from the opposite side.

The configuration and effects of the present invention will be explained below based on the drawings, but the following embodiment is only one specific example, and even if the design of the protection plate and the mounting base is changed in keeping with the spirit of the above and below, All of these are included within the technical scope of the present invention.

Fig. 3 is a perspective view of the main parts illustrating the screw flight protection structure according to the present invention, Fig. 4 is an explanatory diagram showing the screw flight with a protective plate 1111 attached, and Fig. 5 shows the mounting position of the protection plate. FIG.

In these figures, the retaining piece 15 includes a retaining plate 9 with a curved cross section formed by sintering tungsten carbide or the like as described above, and a mounting pedestal attached to the corner B of the retaining plate 9. 16, and the retaining plate 9 and the mounting base 16 are integrally fixed by means such as brazing. and mounting pedestal 16
Bolt 1 for attaching the safety piece 15 is installed on the 16m side of the installation side.
7°17 are integrally planted. Furthermore, these bolts 1
Although the number of attachments 7 is two in the figure, it can be freely increased depending on the shape, size, etc. of the protection piece 15.

In addition, the figure shows a companion in which the protective plate 9 and the mounting base 16 are attached in a staggered manner (Figure 3) and brazed together, but the attachment state of these is not limited to what is shown in the figure; They may be placed in close contact. The shape of the protection plate 9 will be described later. [As shown in Figure 4, the abutting edges of the protection plates 9 that meet S* can be formed in a stepped shape, and if they are overlapped as shown in the figure, the protection plates 9 Since there is a gap between the adjacent surfaces K11, the integrity of the protective piece 15 is increased, and the protective function is improved.

On the other hand, near the top of the scree fly) 5m is Pol) 17.
Through-holes 19 and 19 through which the holes 17 are passed are bored correspondingly to each other. i.e. protective piece 15tl-scrief fly)
5m, as shown in Figure 3, insert the bolts 17.17 into the through holes 19.19 and attach them to the mounting side 1.
6a is a scrief fly) 5m of solid material conveyance @ contact the surface 5a so as to protect it, pass through the through hole 19.19t, and then screw the nut 18 into the protrusion of the bolt 17.17,
Attaching the protective piece 15 is extremely easy.

These protective pieces 15 are sequentially attached along the periphery of the screen flight 5& as shown in FIG. 9 is arranged so as to cover it. Since the protective piece 15 is attached to the screw light 5aK* as described above, when replacing the worn protective piece 15, it can be removed extremely easily by simply loosening the nut 18.

Next, the installation part of the protective piece 15 is as shown in Figure 8g5.
Between the solid-liquid mixture supply port 13 and the solid discharge port 12 [the so-called solid material conveyance path (4 parts of conical bowl)] CK@ may be fixed, and 1 it is used to push out the solid material to the solid material discharge port 1211.
(5b).

Since the present invention is configured as described above, it is possible to obtain the effects summarized below.

(1) The protective piece can be attached and detached very easily, and work can be done even in places where welding equipment is not available.

(2) Nut) 1-Since the nut does not protrude from the solid material conveying side, there is no chance of the nut wearing out or falling off.

(3) When replacing the protective piece, the free flight is not hit completely, so there is no risk of damaging it.

(4) Since the shape is extremely simple, it is suitable for mass production.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view illustrating the structure of a horizontal centrifuge, Fig. 2 is a perspective view showing a conventional protection piece, Fig. 3 is a perspective view showing a protection piece of the present invention, and Fig. 4 is a perspective view showing essential parts. Part explanatory diagram,
FIG. 5 is a cross-sectional view of a main part of a horizontal centrifugal separator equipped with a protective bag piece according to the present invention. 1... Cover 2... Rotating drum 3... Cylindrical bowl part 4...
... Conical bowl part 5 ... Screw 6.
......Solid-liquid mixture inlet pipe 7...Cleared liquid outlet 8...Solid matter outlet 9...
Protective plate 11.15...Interlocking piece 10.
・・Mounting pedestal 17 ・・・・・Bolt 1°°Nut 19 ・・・Through hole Applicant
Kobe Steel, Ltd.

Claims (1)

[Claims] (1) Fix the mounting pedestal to the corner part of the cross-sectional type II guard made of wear-resistant material, and install a bolt in the wrinkled mounting pedestal that protrudes in the opposite direction to the protector. A solid material outlet side through hole in a horizontal centrifuge is formed, and the bolt is passed through the bolt through hole so as to attach the mounting base to the solid material outlet side surface of the wrinkle screen flight, and then tightened with a nut from the opposite side. Scrier flight tip protection structure for horizontal centrifuges.