JPH1043626A - Continuous centrifugal separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a continuous centrifugal separator capable of discharging all of sediments, not generating the clogging of a liquid discharge port and well-ballanced in rotation. SOLUTION: When a mixed and suspended liquid 150 to be separated prepared by mixing waste plastic and a liquid is supplied from a supply port 136 in such a state that a bowl 101 and a rotary discharge mechanism 130 are rotated so as to generate rotational difference, waste plastic is separated into floating matter 151 on the surface of a liquid 152 and sediment 153. Sediments 153 are caught by ribbon type screw blades 134 to be sent to the right to be discharged from a sediment discharge port 106. The liquid 52 and the floating matter 151 overflow a weir plate 140 and the liquid 152 is discharged from a liquid discharge port 105. The floating matter 151 overflowing the weir plate 140 is sent to the left by a paddle 161 to be discharged from a floating matter discharge port 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous centrifuge, which is devised so that solids (eg, waste plastic) can be effectively separated and selected according to the difference in specific gravity.

[0002]

2. Description of the Related Art In order to recycle and reuse waste plastic, a continuous centrifugal separator has been developed which separates and selects waste plastic according to a difference in specific gravity. In order to separate and select waste plastic using this continuous centrifugal separator, first, waste plastic (a plurality of types of plastics having different specific gravities) is finely pulverized, and the pulverized waste plastic is mixed with a liquid. When a turbid liquid to be separated formed by mixing a plurality of types of pulverized plastics (hereinafter referred to as "solids") having different specific gravities and a liquid is supplied to a continuous centrifuge, the specific gravity of the solids and the liquid is obtained. Due to the difference and the action of centrifugal force, solids are separated and selected according to the specific gravity difference (details will be described later).

[0003] The continuous centrifugal separator is made of pulverized waste plastic (for example, ABS resin, PVC (polyvinyl chloride), PET (polyethylene terephthalate), PE).
(Polyethylene), PS (polystyrene), PP (polypropylene)) as well as various kinds of solids having a specific gravity difference.

Here, as an example of a conventional continuous centrifugal separator, an outline of an apparatus disclosed in Japanese Patent Application Laid-Open No. 6-178948 will be described with reference to FIG. As shown in the figure, the hollow bowl 1 has a cylindrical shape at the center and both ends (both ends in the left-right direction in the figure) are conical, and can be rotated around the axis of the shaft core 2. It is rotatably supported. The rotary unloading mechanism 10 is housed in the bowl 1.

[0005] The rotary unloading mechanism 10 includes a rotating shaft 11, screws (screw blades) 13, 15 and a baffle plate 14 as main components.

That is, in the rotary unloading mechanism 10, the rotating shaft 11 is rotatably supported by a bearing 12 so as to be rotatable around the axis 2.
Screw 13, baffle plate 14, screw 1
5 are provided. In addition, the winding directions of the screw 13 and the screw 15 are reversed, and when the screw 13 is rotated in the direction of arrow A, the member (floating material 35 described later) is sent to the left in the figure by the rotation of the screw 13, A member (a sediment 36 described later) is sent to the right in the drawing by the rotation of the screw 15.

The radii of the screw 13, the baffle plate 14, and the screw 15 are gradually increased in this order. In other words, the radius of the screw 13 is small, and is such that the outer peripheral portion is immersed in the surface of the turbid liquid 30 to be separated. The radius of the baffle plate 14 is a medium diameter, and the outer peripheral portion is a radius that is immersed to the central depth of the turbid liquid 30 to be separated. The radius of the screw 15 is large, and is such that the outer peripheral portion extends to near the surface (inner peripheral surface) of the bowl 1.

The turbid liquid 30 to be separated is pulverized and mixed with a plurality of types of waste plastics (solids) having different specific gravities and a liquid 3.
7 is mixed. The turbid liquid 30 to be separated is
It is supplied from a supply pipe 16 formed on the rotating shaft 11, and is supplied into the bowl 1 from a supply port (a distal end opening of the supply pipe 16) 17 formed on the rotating shaft 11.

A discharge port 18 is formed at the left end of the bowl 1, and a discharge port 19 is formed at the right end of the bowl 1.

The discharge pipe 31 is provided substantially at the center of the bowl 1. Moreover, regarding the axial position, the discharge pipe 3
1 is located on the right side of the baffle plate 14. Further, with respect to the radial position, the inner peripheral tip (the upper end in the drawing) of the discharge pipe 31 is arranged closer to the shaft core 2 than the outer peripheral part of the baffle plate 14. It is arranged such that the inner peripheral tip of the discharge pipe 31 is located on the surface of the turbid liquid 30 to be separated.

[0011] Separation by the continuous centrifuge having the above structure.
When making a selection, the bowl 1 and the rotary discharge mechanism 10 are rotated. In this case, the rotation speeds of the bowl 1 and the rotation discharge mechanism 10 are slightly different. When the turbid liquid 30 to be separated is supplied into the bowl 1 in such a state, the solid substance is separated in a short time due to the difference in specific gravity between the solid substance and the liquid 37 and the action of centrifugal force, and a light solid The suspended matter 35 which is an object floats on the surface of the liquid 37, and the sediment 36 which is a heavy solid substance sinks on the inner peripheral surface of the bowl 1.

The suspended matter 35 is caught by the screw 13, sent to the left in the figure, and discharged from the discharge port 18. On the other hand, the sediment 36 is caught by the screw 15, sent to the right in the figure, and discharged from the discharge port 19. In addition, liquid 3
7 is discharged to the outside of the bowl 1 through the discharge pipe 31.

[0013] Because of this, the solid matter (waste plastic) becomes a floating substance 35 having a low specific gravity according to the specific gravity difference.
Is separated and selected into a sediment 36 having a heavy specific gravity.

[0014]

The above prior art has the following problems. (1) Since the sediment 36 is only sent out by the screw 15, the baffle plate 1
The sediment 36 that has settled between the position 4 and the outlet 18 is
It was deposited without being caught by the screw 15 and was difficult to discharge.

(2) The discharge pipe 31 is installed so as to enter from the outer circumference to the inner circumference of the bowl 1 in the radial direction. For this reason, in order to prevent collision (interference) between the screw 15 and the discharge pipe 31, a portion of the screw 15 where the discharge pipe 31 is located is cut out and cut off. Thus, the sediment 36 could not be caught and discharged at the portion where the screw surface was removed, and the discharge efficiency was poor.

(3) Since the screw 15 has a screw cut surface, the screw 15 and, consequently, the rotary discharge mechanism 10 are unbalanced as a rotating body. In order to correct such imbalance, it is necessary to make other parts unnecessarily large or to attach a counterweight to balance. However, in this case, the configuration of the apparatus becomes large.

(4) When treating a turbid liquid having a high concentration to be separated, the rotation difference between the bowl 1 and the rotary unloading mechanism 10 is reduced in order to improve the separation performance (in this case, Will reduce the amount of processing). When processing a turbid liquid to be separated having a high concentration in this manner, the discharge pipe 31 may be clogged. That is, the discharge pipe 31
However, in the radial direction, since it is installed so as to enter from the outer circumference of the bowl 1 to the inner circumference, when processing a high-concentration turbid liquid to be separated, the discharge pipe 31 is easily clogged.

The present invention has been made in view of the above-mentioned prior art, and allows the sediment to be completely discharged without the sediment accumulating in the bowl, the rotation balance being good without increasing the size of the structure, and the pipe being free from clogging. An object of the present invention is to provide a continuous centrifuge capable of performing efficient processing.

[0019]

According to the structure of the present invention, which solves the above-mentioned problems, a bowl rotatably supported around an axis and a bowl having the same axis are arranged in the bowl. A screw shaft rotatably supported around the axis and a rotation carrying-out mechanism having a screw blade provided on the screw shaft, and rotating the bowl and the screw shaft with a rotation difference. During the separation, the turbid liquid to be separated formed by mixing a plurality of types of solids and liquid pulverized different in specific gravity, from the supply port provided on the screw shaft, into the space between the screw shaft and the bowl In a continuous centrifuge in which solids are separated and selected according to a difference in specific gravity by continuously supplying, the bowl is connected to a cylindrical cylindrical portion and the other end of the cylindrical portion. With the axis And a conical portion whose diameter gradually decreases from one end side to the other end side, and a floating substance discharge port is formed at one end of the bowl, and the floating substance is formed at one end of the bowl. A liquid discharge port is formed at the other end side from the discharge port, and further, a sediment discharge port is formed at the other end of the bowl. On the other end side of the discharge port and at one end side of the supply port, a dam plate on a ring projecting inward is provided, and the outer peripheral surface of the screw shaft is provided with the supply port in the axial direction. At a position on the other end side, a ring-shaped baffle plate projecting to the outer peripheral side is provided, and by rotating, the screw blade that catches solids settled on the inner peripheral surface of the bowl and sends it to the other end side is , The outer circumference of which is on the inner circumference of the bowl It has a diameter that is in contact with, and, with respect to the axial direction, at least a portion on one end side of the baffle plate has a shape in which a screw surface of an inner peripheral portion is removed, and is provided at one end of the screw shaft. While being fixed, the tip contacts the portion of the one end of the bowl where the liquid discharge port is formed, and by rotating, catches solids present in the liquid discharge port and faces the floating substance discharge port. It is characterized by having a paddle to send.

Further, according to the configuration of the present invention, the position of the outer peripheral end of the baffle plate is located on the outer peripheral side of the position of the inner peripheral end of the weir plate with respect to the axial center with respect to the radial position. The baffle plate and the weir plate are defined by radial lengths.

Further, in the configuration of the present invention, the liquid discharge port may be
A large number of small-diameter holes are formed in the bowl.

Further, in the configuration of the present invention, a wire mesh is disposed at the liquid outlet.

Further, according to the structure of the present invention, the screw shaft is rotated near the other end of the weir plate,
A scraping plate for scooping up solids floating in the liquid and passing over the weir plate is provided.

Further, in the configuration of the present invention, the diameter of the cylindrical portion of the bowl gradually increases from one end to the other end.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the overall configuration of a continuous centrifuge 100 according to an embodiment of the present invention, FIG. 2 shows the internal structure of the continuous centrifuge 100, and FIG.
A section is shown. In order to clarify the positional relationship, FIG.
And in FIG. 2, regarding the axial direction, “left end” in the drawing.
The “left” and “left” are referred to as “one end” and “one end”, respectively, and the “right end” and “right” in the drawings are referred to as “other end” and “other end”.

As shown in FIGS. 1 and 2, the bowl 101 of the continuous centrifugal separator 100 has both ends (left and right ends) rotatably supported by bearings 102. The bowl 101 has a pulley 201, a belt 20
2. When the rotation force is transmitted from the bowl driving device 200 via the pulley 203, the rotation is performed around the shaft center 103.

The bowl 101 is connected to a cylindrical portion 101a having a cylindrical shape, an end plate 101b for closing one end surface (left end surface) of the cylindrical portion 101a, and the other end of the cylindrical portion 101a. A conical portion 1 whose diameter gradually decreases from one end (left end) to the other end (right end) in the axial direction
01c and a cylindrical bowl head 101d connected to the other end of the conical portion 101c.

At one end (left end) of the cylindrical portion 101a of the bowl 101, a suspended matter discharge port 104 is formed. On one end of the cylindrical portion 101a, on the other end side (right side) of the suspended matter discharge port 104, there is formed a liquid discharge port 105 composed of a number of small-diameter holes. The diameter of the hole of the liquid discharge port 105 is set smaller than the diameter of the waste plastic after pulverization. Specifically, when the diameter of the waste plastic after pulverization is 6 to 7 mm, the diameter of the hole of the liquid discharge port 105 is 4 to 5 mm.

The bowl head 101c of the bowl 101 has a sediment discharge port 106 formed therein.

The screw shaft 131 of the rotary discharge mechanism 130
Are rotatably supported by bearings 132 at both ends (left and right ends). This screw shaft 131 is
Rotational force is transmitted from the screw driver 210 via the pulley 211, the belt 212, the pulley 213, and the screw reducer 214, thereby rotating around the axis 103. That is, the bowl 101 and the screw shaft 131 of the rotary unloading mechanism 130 are arranged concentrically. Although the details will be described later, when performing the separation / selection processing, the rotation speeds of the bowl 101 and the rotation discharge mechanism 130 (a mechanism including the screw shaft 131 and the like, which will be described in detail later) are slightly different. .

The screw shaft 131 of the rotary discharge mechanism 130
, A number of columns 133 are fixed, and a ribbon-type screw blade 134 is provided via the columns 133. The ribbon-type screw blade 134 is
As shown in FIG. 4, the screw surface of the inner peripheral portion is removed from the screw surface of the screw blade having a normal shape (shape like the screws 13 and 15 shown in FIG. 6). . Ribbon type screw blade 134
Has a well-balanced shape as a rotating body because only the screw surface of the inner peripheral portion is removed. In addition, the screw blade 134 is
(See FIG. 3) with a slight gap left between them.

As described above, the screw blade 134
Has a shape in which the screw surface of the inner peripheral portion is removed, so that the turbid liquid to be separated 150 described later can flow along the inner peripheral portion of the screw blade 134 in the axial direction. Further, when the screw blade 134 rotates in the direction of arrow B due to the rotation of the screw shaft 131, the screw blade 134 catches a sediment 153 described later and sends it to the other end (right side).

A supply pipe 135 is disposed in the screw shaft 131, and a supply port 136 is formed in the screw shaft 131. The turbid liquid 150 to be separated, which is obtained by mixing the liquid 152 with a crushed solid such as waste plastic, passes through the supply pipe 135 and the supply port 136,
It is supplied to the space between the bowl 101 and the screw shaft 131.

The weir plate 140 is formed on the cylindrical portion 1 of the bowl 101.
01a is fixed to the inner peripheral surface. This weir plate 140
In the axial direction, it is located at the other end side (right side) of the liquid discharge port 105 and at one end side (left side) of the supply port 136. Further, the weir plate 140 has a ring-like shape projecting inward from the inner peripheral surface of the cylindrical portion 101a in the radial direction, and is fixed concentrically to the inner peripheral surface of the cylindrical portion 101a. (See FIG. 3). Because of such a weir plate 140, the turbid liquid 150 to be separated is
0 and is temporarily blocked and temporarily stored in the space between the screw shaft 131 and the bowl 101.

The baffle plate 141 has a ring shape and is fixed concentrically to the outer peripheral surface of the screw shaft 131. Moreover, this baffle plate 141
Is located on the other end side (right side) of the supply port 136 with respect to the axial position.

Further, with respect to the radial position, the outer peripheral end of the baffle plate 141 is located on the outer peripheral side of the inner peripheral end of the weir plate 140 with respect to the axis 103 so as to be located on the outer peripheral side. And the radial length of the baffle plate 141 are defined. Therefore, the outer peripheral end of the baffle plate 141 is immersed to a position deeper than the surface of the turbid liquid 150 to be temporarily stored.
The inner peripheral end of the weir plate 140 is located on the surface of the turbid liquid 150 to be temporarily stored.

A plurality of paddles 161 are fixed to the boss 160 of the screw shaft 131. These paddles 1
The outer peripheral end of 61 contacts the portion forming the liquid outlet 105 on the inner peripheral surface of the cylindrical portion 101a. When the paddle 161 rotates in the direction of the arrow B due to the rotation of the screw shaft 131, the paddle 161 catches a sediment 153 (described later) existing at the liquid discharge port 105 and has one end side (left side).
Send to

The scraping blade 170 has a screw shaft 131
And is arranged in contact with the other end of the weir plate 140. When the scraper blade 170 rotates in the direction of arrow B, the suspended matter 151 in the turbid liquid 150 to be separated, which is blocked by the weir plate 140, is scraped up from the liquid to the inner peripheral end of the weir plate 140. It is sent to one end (left side) beyond the plate 140.

The continuous centrifuge 1 having the above configuration
The dimensions of the main part of 00 are shown here. The axial length is 1.4 m, and the diameter of the large diameter portion of the screw shaft 131 is 19
0 mm, the inner diameter of the cylindrical portion 101a of the bowl 101 is 350
mm.

Further, the bowl 101 and the rotary unloading mechanism 13
0 is rotatable at 300-3000 rpm. When performing separation / selection processing described later, the rotation speed is set to, for example, 11
Rotating at 60 rpm produces a centrifugal force of 300G.
When performing the separation / selection process, the difference in the number of rotations between the bowl 101 and the rotary unloading mechanism 130 is set to about 5 rpm.

Next, the operation of the continuous centrifuge 100 for performing the separation / selection process will be described. here,
As solids, PVC (specific gravity 1.17 to 1.54), P
ET (specific gravity 1.38 to 1.39), PP (specific gravity 0.91
0.93), PS (specific gravity 1.05), PE (specific gravity 0.
A case where a turbid liquid to be separated (water slurry 30% by weight) 150, which is obtained by pulverizing waste plastics mixed with 20 to 90% each in a ratio of 20% and water as the liquid 152, is supplied.

First, the rotation speed of the bowl 101 is set to 1160 rp.
m, and the difference in the number of rotations between the bowl 101 and the rotary unloading mechanism is 5
rpm. In this state, the bowl 101, the screw shaft 131, the weir plate 140, and the baffle plate 14 are supplied with the 1 m ³ of the turbid liquid to be separated (water slurry 30 wt%) 150 through the supply pipe 135 and the supply port 136 for 1 hour.
1 is supplied to the space surrounded by 1. In this way, the solid pulverized plastic and the liquid (water) 150
The solid matter is separated in a short time by the action of the specific gravity difference from the above and the centrifugal force. That is, light PE, PS, and PP are suspended substances 1
As 51, it floats on the surface (inner peripheral surface) of the liquid 152, and heavy PVC and PET become sediment 153 and sink on the inner peripheral surface of the bowl 101.

The sediment (PVC, PET) 153 is caught by the screw blade 134, sent to the other end (right side), and discharged from the sediment discharge port 106. The water content of the discharged sediment (PVC, PET) 153 is 1.5 wt%
Met. PE, P is contained in the discharged sediment 153.
S and PP were not included at all.

The baffle plate 141 is used for the turbid liquid 1 to be separated.
Floating substances (PE, P)
The (S, PP) 151 does not move to the other end side (right side) of the baffle plate 141. In addition, since the turbid liquid 150 to be separated is continuously supplied, the liquid 152
The suspended matter 151 is sent over the weir plate 140 (overflow) to one end side (left side). In addition, the floating matter 151 is also lifted up from the liquid to the liquid surface by the action of the scraper blade 170 and passes over the weir plate 140.

The liquid 152 having passed over the weir plate 140 is immediately discharged from the liquid discharge port 105 by centrifugal force.
In addition, the floating material 151 that has passed over the weir plate 140 is the paddle 16.
While being scraped off by 1, it is sent to one end (left side) and discharged from the suspended matter discharge port 104. The water content of the discharged suspended matter (PE, PS, PP) 151 was 1.5% by weight. Also, suspended matter (PE, PS, PP) 15
No. 1 contained no PVC or PET.

The portion of the inner peripheral surface of the cylindrical portion 101a where the liquid discharge port 105 is formed is constantly scraped off by the paddle 161.
Is not blocked by the suspended matter 151.

In this way, while dewatering, heavy PV
C and PET can be separated and selected from light PE, PS and PP.

In order to further improve the recovery rate,
Instead of forming the liquid outlet 105 with a large number of holes, a large-diameter hole may be formed, and a wire mesh may be arranged in the large-diameter hole. If a 16-mesh wire mesh is adopted, the eye opening can be made 2 mm.
If a 0 mesh object is used, the eye opening can be reduced to 0.8 mm. As described above, by using the wire mesh, the recovery rate can be improved to 99%.

In the above embodiment, the ribbon-type screw blades 134 are employed. However, one end side (left side) of the baffle plate 141 is a ribbon-type screw blade.
The other end (right side) of the baffle plate 141 may be a normal screw (there is a screw surface up to the inner circumference). In other words, on one end side from the baffle plate 141, it is necessary to send the liquid 152 and the suspended matter 151 to one end side through the inner diameter portion of the screw. Therefore, at least one end side from the baffle plate 141 is a ribbon-type screw blade. You have to.

Note that, as shown in FIG.
a, going from one end side to the other end side in the axial direction,
It is also possible to adopt a shape whose diameter is gradually increased. This makes it easier to collect the sediment 153 at the connection between the cylindrical part 101a and the conical part 101c, so that the sediment 15
3 can be discharged.

The present invention can be applied to separation and selection of not only waste plastics but also various solids according to the difference in specific gravity.

[0053]

As described above, according to the present invention, at least a portion of the screw blade at one end side of the baffle plate in the axial direction except for the inner peripheral portion is removed. Because the ribbon-type screw blade is used, even if the sediment that has settled to one end from the baffle plate is secured by the screw blade, all of the liquid or suspended matter is sent to the other end while securing the flow toward one end. Can be discharged. For this reason, sediment does not accumulate and it is efficient and separates for a long time.
A selection process can be performed.

The suspended matter that has reached the liquid discharge port is scraped off by the paddle and sent to one end side, so that the liquid discharge port is not blocked by the suspended matter, and the liquid after the treatment is discharged well. . Incidentally, conventionally, since the liquid was discharged through a discharge pipe projecting into the bowl, the discharge pipe was sometimes clogged and the liquid could not be discharged.

Conventionally, there was a discharge pipe protruding into the bowl. However, in the present invention, since there is no member protruding into the bowl,
The rotating unloading mechanism including the screw blades has a balanced structure as a rotating body. For this reason, an accessory such as a counterweight is not required, and the apparatus configuration is compact.

Conventionally, there was a discharge pipe protruding into the bowl, but in the present invention, there is no member protruding into the bowl.
The screw blades disposed close to the inner peripheral surface of the bowl are not cut off in the axial direction, and the sediment can be caught and discharged by the screw blades in all parts of the inner peripheral surface of the bowl.

Further, the recovery rate can be further improved by providing a scraping plate or a wire mesh at the liquid discharge port. Also, by making the diameter of the cylindrical portion gradually increase from one end to the other end,
Recovery of sediment can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a continuous centrifuge according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an internal structure of the continuous centrifuge according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view showing a ribbon-type screw blade.

FIG. 5 is an overall configuration diagram showing a continuous centrifuge in which a bowl shape is modified.

FIG. 6 is a configuration diagram showing a conventional continuous centrifuge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bowl 2 Shaft core 10 Rotary unloading mechanism 11 Rotating shaft 12 Bearing 13, 15 Screw 14 Baffle plate 16 Supply pipe 17 Supply port 18, 19 Discharge port 30 Separated turbid liquid 31 Discharge pipe 35 Floating matter 36 Sediment 37 Liquid 100 Continuous Centrifugal separator 101 Bowl 101a Cylindrical part 101b End plate 101c Conical part 101d Bowl head 102 Bearing 103 Shaft core 104 Floating matter discharge port 105 Liquid discharge port 106 Sediment discharge port 130 Rotary discharge mechanism 131 Screw shaft 132 Bearing 133 Post 134 screw blade 135 supply pipe 136 supply port 140 weir plate 141 baffle plate 150 turbid liquid to be separated 151 suspended matter 152 liquid 153 sediment 160 boss 161 paddle 170 scraping blade

Continued on the front page (72) Inventor Hirohiko Kaida 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Heavy Industries, Ltd. (72) Inventor Masami Nakao 12-nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Inside the factory (72) Inventor Fujio Negishi 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Pref.

Claims (6)

[Claims] 1. A bowl rotatably supported around an axis, a screw shaft and a screw disposed in the bowl with the same axis and rotatably supported around the axis. A rotary unloading mechanism having a screw blade provided on the shaft, and when rotating the bowl and the screw shaft with a difference in rotation, a plurality of types of pulverized solids having different specific gravities are different. The turbid liquid to be separated, which is obtained by mixing the liquid and the liquid, is continuously supplied from the supply port provided on the screw shaft to the space between the screw shaft and the bowl, so that the solid material is changed according to the specific gravity difference. In the continuous centrifuge for separating and selecting, the bowl is connected to the other end of the cylindrical portion and the cylindrical portion, and the diameter increases from one end to the other end in the axial direction. Gradual decrease A conical part, and a floating substance discharge port is formed at one end of the bowl, and a liquid discharge port is formed at the other end of the one end of the bowl with respect to the floating substance discharge port. And further forming a sediment discharge port at the other end of the bowl, of the inner peripheral surface of the bowl, with respect to the axial direction, at the other end side from the liquid discharge port and from the supply port. Also provided at one end side is a weir plate on a ring that protrudes inward, and of the outer peripheral surface of the screw shaft, in the axial direction, protrudes outward on the other end side from the supply port. The screw blade is provided with a ring-shaped baffle plate. By rotating, the screw blade catches solids settled on the inner peripheral surface of the bowl and sends it to the other end side, and its outer peripheral portion is close to the inner peripheral surface of the bowl. Diameter, and in the axial direction At least a portion on one end side of the baffle plate has a shape in which a screw surface of an inner peripheral portion is removed, and is fixed to one end portion of the screw shaft, and a tip is one end portion of the bowl. A paddle that contacts a portion where the liquid discharge port is formed and rotates to catch solids present in the liquid discharge port and send the solid to the floating substance discharge port. Continuous centrifuge. 2. The baffle plate and the baffle plate are positioned such that an outer peripheral end of the baffle plate is located on an outer peripheral side of an inner peripheral end of the weir plate with respect to the axial center with respect to a radial position. 2. The continuous centrifuge according to claim 1, wherein a radial length of the weir plate is defined. 3. The liquid discharge port according to claim 1, wherein a number of small-diameter holes are formed in the bowl.
Continuous centrifuge. 4. The continuous centrifuge according to claim 1, wherein a wire mesh is disposed at the liquid outlet. 5. A scraping plate, wherein the screw shaft is rotated in proximity to the other end of the weir plate to scoop up solids floating in the liquid and to pass over the weir plate. The continuous centrifuge according to claim 1, wherein the centrifuge is provided. 6. The continuous centrifuge according to claim 1, wherein the diameter of the cylindrical portion of the bowl gradually increases from one end to the other end.