JP2003080113A - Vertically standing decanter-like centrifuge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertically standing decanter-like centrifuge comprising a washing apparatus capable of shortening the time to be taken for washing work and washing evaluation. SOLUTION: The vertically standing decanter-like centrifuge comprises a rotation bowl 4, a screw conveyer 2 coaxially installed in the rotation bowl 4 and rotating with a slight difference of the speed from that of the rotation bowl 4, a separate rib plate 3 installed continuously from the lower end part of a raw material slurry supply pipe 1 for supplying a raw material slurry to a cylindrical part 4A of the rotation bowl 4, and a rubber skirt 5 installed in a manner that it surrounds the outside of the entire body of a solid mater discharge part including a solid matter discharge outlet 8 of the rotation bowl 4. The washing apparatus in the vertically standing decanter-like centrifuge has through holes H which are to insert washing liquid supply pipes 30, 31 through approximately parallel to the screw shaft 2B from an aperture of an upper part end plate 10 and are formed in a screw blade 2A of the screw conveyer 2 and the washing apparatus washes the inside of the rotation bowl 4 by jetting a washing liquid out of jetting holes H' of the washing liquid supply pipes 30, 31 inserted into the through holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical decanter centrifuge, and more particularly to a vertical decanter having a cleaning device capable of suitably cleaning the inside of a rotary bowl, the screw blades and the inside of a rubber skirt. Type centrifuge.

[0002]

2. Description of the Related Art A vertical decanter centrifuge is a place where solid-liquid separation is required in a centrifugal force field such as dehydration of resin in a chemical factory, recovery of catalysts and antioxidants, and classification of kaolin and titanium oxide. Is often used in.

Conventional vertical decanter centrifuge 100
As shown in FIG. 5, the solid content outlet 1 is provided on the lower small diameter end side.
Frusto-conical portion 101A having 13 and the frusto-conical portion 1
A cylindrical portion 101B connected to the upper large-diameter end side of 01A and having a separated liquid discharge port in which a dam plate 103B is provided on the upper end plate 103.
And a rotating bowl 101 comprising
A screw conveyor 102 that is coaxially provided inside and rotates at a slight speed difference from the rotating bowl 101 via a speed difference device 108, and a cylindrical portion 101 of the rotating bowl 101.
An undiluted slurry supply pipe 105 that is inserted into the axial center portion from the insertion hole 104 of the upper end plate 103 of B and that supplies undiluted slurry to the cylindrical portion 101B, and the undiluted slurry supply pipe 10
5, a flow dividing rib plate 106 that is connected to the lower part of the rotary bowl 101 and is radially provided in the radial direction inside the rotary bowl 101;
01 is fixed to the top of the pedestal 112 in parallel, and the rotating bowl 101 is fixed to the pulleys 107A and 107C and the belt 107B.
A main electric motor 107 that rotates at a high speed through a screw conveyor 1 that is provided below the rotating bowl 101 and has a slight speed difference from the rotating speed of the rotating bowl 101.
And a differential speed device 108 for rotating 02, and the differential speed device 10
8 and a differential speed electric motor 10 provided in parallel to drive the screw conveyor 102 via the differential speed device 108.
9 and an upper part thereof are provided so as to surround the entire solid content discharge part including the solid content discharge port 113 with an appropriate gap from the outside, and a lower part thereof is a bell jar type rubber skirt having a lower end surface 110C opened. The main part is composed of 110 and a pedestal 112 on which these devices and pipes are arranged and fixed.

Next, the operation of the vertical decanter type centrifugal separator having the above structure will be described with reference to FIG. Into the rotating bowl 101 which rotates at high speed (for example, 3000 to 5000 min ⁻¹ ), the undiluted slurry is rotated through the undiluted slurry supply pipe 105 and the flow dividing rib plate 106.
It is supplied to a predetermined position of one cylindrical portion 101B. The solid content in the slurry supplied from the flow dividing rib plate 106 to the cylindrical portion 101B receives centrifugal force and settles to the inner wall side. The settled solid content is scraped up to the frustoconical section 101A side by the screw blades 102A of the screw conveyor 102, and is drained before being conveyed to the solid content discharge port 113. The solid content drained in the truncated cone portion 101A is the solid content discharge port 1 provided on the small-diameter end side of the truncated cone portion 101A.
Bell jar-shaped rubber skirt 110 horizontally from 13
Is discharged inside.

The solid content discharged in the horizontal direction is lost by colliding the momentum given by the centrifugal force with the inner wall of the rubber skirt 110. At this time, in the case of a sticky or adhesive solid content, even if the material is rubber different from metal, it adheres to the inner wall. Therefore, a plurality of, for example, four peeling mechanisms 115, 116 ... Are provided along the boundary between the head portion 110B and the cylindrical portion 110A on the outer peripheral upper portion of the rubber skirt 110 (however, in the drawing, 115 and 116 are provided. Cylinders 115A, 116A (only shown), but pistons 115B, 1 (only 115A, 116A are shown in the drawing)
16B ... (However, only 115B and 116B are shown on the drawing)
Is linearly operated at regular intervals to temporarily deform the shape of the rubber, so that the solid content adhering to the inner surface of the upper portion of the rubber skirt 110 is separated from the inner wall. The solid content that has been peeled off and dropped on the belt 119A of the belt conveyor 119 is carried out to the outside as a solid matter by rotating the motor 119B of the belt conveyor 119. On the other hand, the separated liquid separated in the rotating bowl 101 is
01 through the separation liquid overflow port 103A provided in the upper end plate 103 of the cylindrical portion 101B, overflows the dam plate 103B, and is discharged from the separation liquid discharge port 111 to the outside as a separation liquid.

[0006]

In such a conventional vertical decanter centrifuge 100, the machine is usually washed and stopped after the above-mentioned solid-liquid separation operation is completed. When the cleaning at this time can be simply performed as in the conventional case, it was sufficient to supply the cleaning liquid from the undiluted solution slurry supply pipe 105 for cleaning. However, in recent years, one vertical decanter centrifuge has been increasingly used for multipurpose solid-liquid separation, which is said to be the era of high-mix low-volume production. When the vertical decanter centrifuge is used for such multipurpose solid-liquid separation, foreign matter (for example, the processed product of the previous time) is mixed into the product if the mechanical cleaning is insufficient, which causes a problem. Therefore, a high degree of cleaning is required, and when finally confirming the cleaning effect, the upper end plate 103 of the rotating bowl 101 is opened, the screw conveyor 102 is disassembled from the rotating bowl 101, and the surface of the machine is visually inspected. The method of observing is adopted. For this reason, since the cleaning work takes too much time, a vertical decanter centrifuge capable of performing the cleaning work in a short time has been desired.

The present invention has been made to solve the above problems, and provides a vertical decanter centrifuge having a cleaning device capable of shortening the time required for the cleaning operation and cleaning evaluation of a machine. The purpose is to do.

[0008]

The vertical decanter centrifuge according to claim 1 made in order to solve the above-mentioned problems, has a frustoconical portion having a solid content discharge port at the lower small diameter end side. A rotary bowl which is connected to the upper large-diameter end side of the truncated cone and has a cylindrical portion having a separation liquid overflow port provided with a weir plate on the upper end plate, and which is coaxially provided in the rotary bowl. , A screw conveyor that rotates at a slightly different speed from the rotating bowl via a speed difference device, and an insertion hole in the upper end plate of the cylindrical portion of the rotating bowl, which is inserted into the shaft center portion to supply the stock solution slurry to the cylindrical portion. The raw liquid slurry supply pipe, the flow dividing rib plate connected to the lower end of the raw liquid slurry supply pipe in the radial direction inside the rotating bowl, and the solid content discharge unit including the solid content discharge port are surrounded from the outside. -Shaped rubber installed like In a vertical decanter centrifuge equipped with a cart, a through hole for inserting the cleaning liquid supply pipe from the opening of the upper end plate into the screw shaft substantially in parallel is formed in the screw blade of the screw conveyor. A cleaning device for cleaning the inside of the rotary bowl by injecting a cleaning liquid from an injection hole of the cleaning liquid supply pipe inserted in the through hole is provided.

According to the first aspect of the present invention, in the vertical decanter centrifuge, the through hole for inserting the cleaning liquid supply pipe into the screw shaft from the opening of the upper end plate of the rotating bowl is provided. By piercing the screw blades of the screw conveyor, by including a cleaning device for cleaning the inside of the rotating bowl by injecting the cleaning liquid from the injection hole of the cleaning liquid supply pipe inserted in the through hole,
Since there is no opening for cleaning in the upper end plate of the rotating bowl, which has been a problem in the past, it is not necessary to open the entire upper end plate of the rotating bowl and disassemble the screw conveyor from the rotating bowl for cleaning. The time required for work can be shortened.

A vertical decanter centrifuge according to a second aspect of the present invention is a positioning device for removably fitting the cleaning liquid supply pipe into an uppermost through hole provided near the screw shaft of the screw blade in the cleaning liquid supply pipe. A member is provided, and when the positioning member is fitted into the through hole, the through hole and the positioning member are formed so that the injection hole faces the inner surface of the rotary bowl. The vertical decanter centrifuge according to Item 1.

According to the second aspect of the present invention, the cleaning liquid supply pipe is provided with a positioning member which is removably fitted in the uppermost through hole provided near the screw shaft of the screw blade. Is inserted into the through hole, the through hole and the positioning member are formed so that the injection hole faces the inner surface of the rotating bowl, thereby reliably fixing the injection direction of the cleaning liquid and The supply pipe can be held so as not to fall.

The vertical decanter centrifuge according to a third aspect of the present invention is characterized in that the through hole into which the cleaning liquid supply pipe is inserted is provided at a position centered at 60 degrees in plan view. The vertical decanter centrifuge according to claim 1 or 2.

According to the third aspect of the present invention, the through-hole for inserting the cleaning liquid supply pipe is provided in the screw blade at a position that is divided by 60 degrees in plan view, so that when the through-hole is processed. Not only the positioning of the holes becomes easy, but also the inner surface of the rotating bowl and the entire screw blade can be suitably washed due to the synergistic effect with the jet angle of the washing liquid jetted from the washing liquid supply pipe.

In the vertical decanter centrifuge according to the fourth aspect, the number of injection holes of the cleaning liquid supply pipe is determined according to the cleaning capacity required for each cleaning liquid supply pipe. The opening is formed with an appropriate width along the circumferential direction so that the spray angle of the cleaning liquid is 60 degrees or more centered on the spray hole. It is a vertical decanter centrifuge.

According to the invention described in claim 4, the number of the injection holes of the cleaning liquid supply pipe is determined corresponding to the cleaning ability per cleaning liquid supply pipe, and the injection angle of the cleaning liquid is centered on the injection hole. The opening is appropriately wide along the circumferential direction so as to be 60 degrees or more, so that the injection hole can be prevented from being blocked by dust or the like in the water, and the injection angle can be 60 degrees or more. Therefore, the inner surface of the rotating bowl and the blades of the screw can be suitably washed.

According to a fifth aspect of the present invention, in the vertical decanter centrifuge, a cleaning liquid supply pipe is inserted from the upper opening portion of the rubber skirt into the shoulder portion of the rubber skirt and the rotary bearing box of the screw conveyor. The vertical decanter centrifuge according to any one of claims 1 to 4, wherein the direction of the injection hole of the cleaning liquid supply pipe is arranged so that the cleaning liquid can be washed.

According to the invention described in claim 5, the cleaning liquid supply pipe is inserted into the inside from the upper opening portion of the rubber skirt so that the shoulder portion of the rubber skirt and the rotary bearing box of the screw conveyor can be washed. By arranging the direction of the injection holes of the cleaning liquid supply pipe, it is possible to preferably clean the portion that is the most difficult to clean due to adhesion of solids and the like.

In the vertical decanter centrifuge described in claim 6, a fiberscope is inserted into the through hole of the screw blade for cleaning evaluation, and visually observed.
The vertical decanter centrifuge according to any one of claims 1 to 4, which is configured to be evaluated.

According to the invention described in claim 6, the fiberscope is inserted into the through hole of the screw blade for the cleaning evaluation, and the visual observation and evaluation are performed, so that the machine is disassembled after the machine cleaning. Since the cleaning effect can be confirmed without doing so, the cleaning time can be shortened.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vertical decanter centrifuge having a cleaning device according to the present invention will be described with reference to the drawings.

First, the outline of the internal structure equipped with a cleaning device for cleaning the vertical decanter type centrifugal separator according to the present invention will be described with reference to FIGS. 1 and 2. still,
FIG. 1 is a vertical cross-sectional view showing an outline of a mounting position of a cleaning device inside a vertical decanter centrifuge according to the present invention,
FIG. 2 (a) is a plan sectional view showing the position of a through hole provided in a screw blade for inserting a cleaning liquid supply pipe of a vertical decanter type centrifugal separator according to the present invention, and FIG. 2 (b) shows the present invention. 3 is a cross-sectional view of the screw conveyor of the vertical centrifuge according to FIG. The vertical decanter centrifuge according to the present invention,
As shown in FIG. 1, a frustoconical portion 4A having a solid content discharge port 8 on the lower small-diameter end side and an upper large-diameter end side of the truncated conical portion 4A are connected to each other, and a weir plate 10B is provided on the upper end plate 10. Rotating bowl 4 consisting of a cylindrical portion 4B having a separated liquid discharge port provided
And a screw conveyor 2 which is coaxially provided in the rotary bowl 4 and rotates at a slight differential speed with the rotary bowl 4 via a differential speed device 12, and a screw shaft 2B for inserting a cleaning liquid supply pipe. A screw blade 2A of the screw conveyor 2 having a through hole H (see FIG. 2B) formed in a straight line so as to be in parallel with the cleaning blade, and a cleaning device that is detachably inserted into the screw blade 2A. 6 cleaning liquid supply pipes 30, 31 ... And the insertion hole 11 of the upper end plate 10 of the cylindrical portion 4B of the rotary bowl 4 is inserted into the shaft center portion, and the cleaning liquid is supplied to the cylindrical portion 4B instead of the stock solution slurry. A stock solution slurry supply pipe 1 to be supplied, a flow dividing rib plate 3 which is connected to a lower portion of the stock solution slurry supply pipe 1 and is provided radially in a radial direction inside a rotating bowl 4, and a pedestal in parallel with the rotating bowl 4. 3, a main electric motor (not shown) fixed at the upper part of the rotary bowl 4 for rotating the rotary bowl 4 at a high speed via a pulley and a belt, and a main motor provided at the lower part of the rotary bowl 4 and having a rotation speed of the rotary bowl 4 A differential speed device 12 for rotating the screw conveyor 2 with a differential speed, and a differential speed motor 1 provided in parallel with the differential speed device 12 and driving the screw conveyor 2 via the differential speed device 12.
4 and the upper part thereof are four cleaning liquid supply pipes 40,
41 has an inlet and a viewing window, and the solid content outlet 8
Is provided so as to surround the entire solid content discharging part including the appropriate intervals from the outside, and the lower part thereof has a bell jar-shaped rubber skirt 5 having a lower end surface 5C opened, and these devices and pipes are provided above it. A main part is composed of a gantry 13 which is arranged and fixed, and a cleaning and drainage transfer facility formed by the cleaning and drainage tank 6 and the drainage pump 7.

The rotating bowl 4 has a shape in which a truncated cone portion 4A and a cylindrical portion 4B which is connected to the large diameter end side of the truncated cone portion 4A are integrated. A solid content discharge port 8 is provided on the lower small-diameter end side of the truncated cone portion 4A, and the solid content conveyed by the screw conveyor 2 is discharged horizontally from the solid content discharge port 8 and below the rubber skirt 5. It passes through the end surface 5C, falls into the cleaning liquid drain tank 6, and is transferred to the waste water treatment facility together with the cleaning liquid drain.

The screw conveyor 2 includes a screw shaft 2
B and a screw blade 2A spirally surrounding the surface of the screw shaft 2B. Through holes H are provided so that six cleaning liquid supply pipes 30, 31, ... (Only two are shown in the drawing), which are cleaning devices, can be inserted into the screw blades 2A of the screw conveyor 2 in parallel with the screw shaft 2B. Is provided. The through holes H are provided so as to be centrally distributed at 60 degrees in a plan view. The details of the configuration and operation of the cleaning liquid supply pipe, which is the cleaning device, will be described later. Further, the screw conveyor 2 is driven through the differential speed device 12 using the differential speed electric motor 14 as a drive source, and the differential speed (minimum speed) is proportional to the difference between the rotational speed of the rotating bowl 4 and the rotational speed of the differential speed electric motor 14. Then, the screw conveyor 2 can be rotated at 0.5 to 3 min ⁻¹ ).

The stock solution slurry supply pipe 1 is a pipe with a flange, and may be a circular pipe or a square pipe. The flange of the stock solution slurry supply pipe 1 is provided at the upper end of the stock solution slurry supply pipe 1. In this embodiment, the stock solution slurry supply pipe 1
Is a cleaning liquid for preliminarily cleaning the vertical decanter centrifuge, which is rotated by a rotating bowl 4 through a flow dividing rib plate 3 described later.
Used to feed in.

The flow dividing rib plate 3 is a hollow pipe for distributing the cleaning liquid, which is connected to the lower end of the stock liquid slurry supply pipe 1 and radially arranged in the rotating bowl 4 in the radial direction.
The shape of one of the flow dividing rib plates 3 is a pipe member having a substantially constant width from the center of the rotating bowl 4 toward the inner wall when viewed from a plane (radial cross section), and when viewed in a sectional view along the axial direction. The hollow bowl has a trapezoidal shape (a shape that widens toward the end) from the center side of the rotary bowl 4 toward the inner wall side, and is a hollow pipe for axially dividing the flow of the cleaning liquid from the stock solution slurry supply pipe 1 in the axial direction. That is, the upper and lower bases are open and the hypotenuse is closed. The flow dividing rib plate 3 is inserted and fixed in a thin groove (not shown) that is radially provided in the radial direction of the screw shaft 2B. The stock solution slurry supply pipe 1 and the flow dividing rib plate 3 are pipes communicating with each other. The open bottom side of the flow dividing rib plate 3 communicates with the outer wall of the screw shaft 2B. By providing the flow dividing rib plate 3 in this way,
Since the flow of the cleaning liquid can be changed from the axial direction to the radial direction to reliably supply the cleaning liquid to the inner wall of the rotating bowl 4,
Compared with the case where the flow dividing rib plate 3 is not provided, the rotating bowl 4
It is possible to lengthen the time for washing the solid content attached inside.

As the main motor (not shown), a fully-closed outdoor fan outdoor three-phase induction motor or three-phase synchronous motor is used. An electric motor having 2 to 6 poles is used. As the main motor, an inverted type motor with a flange (upward on the output shaft) is used. The traction motor is attached by fixing it to a beam protruding from a column 13A of the pedestal 13 with bolts and nuts. A pulley is attached to the drive shaft of the main electric motor and is connected to a pulley on the side of the rotating bowl 4 via a belt to transmit the output of the main electric motor to the rotating bowl 4 via the belt.

The differential speed device 12 is a planetary gear speed reducer that reduces the speed in two or more stages. The high speed shaft and the low speed shaft of the differential speed device 12 are on the same core and rotate in the same direction, which is convenient for the layout and the place of installation. The planetary gear mechanism is surprisingly small and lightweight compared to the parallel shaft gear, and is characterized in that it is easy to handle.

As the differential speed motor 14, a three-phase induction motor or a three-phase synchronous motor of a fully closed fan outdoor type is used. The number of poles is 2
~ 6 electric motors are used. As the differential speed electric motor 14, an upright type electric motor with a flange (output shaft downward) is used.
The differential speed electric motor 14 is installed in parallel with the differential speed device 12 in a vertical direction so that power can be laterally transmitted to the differential speed device 12 via a belt and a pulley. Differential speed motor 1
4 is synchronized with a main electric motor (not shown) when the differential speed device 12 is not operating, and is rotated at the same rotation speed as the main electric motor. Differential speed motor 12
As for the number of revolutions, the rotational speed of the differential speed electric motor 14 with respect to the rotational speed of the main electric motor can be determined by deciding the setting value of the differential speed of the screw conveyor 2 (provided that the speed reduction ratio of the differential speed device 12 is constant).

The rubber skirt 5 has a bell jar shape, and has a dome-shaped head portion 5A and a cylindrical portion 5B integrated with each other. The head 5A of the rubber skirt 5 has 9
Four opening / closing covers (windows) are provided with 0 degree centering. The four cleaning liquid supply pipes 40, 41 ... Are attached to the opening / closing covers, respectively, and the rubber skirt 5 is seen while looking at the inside through the viewing window. Is configured to clean the interior of the. The direction of spraying the cleaning liquid is such that the cleaning is performed toward the facing shoulder portion 5D of the rubber skirt 5 and the rotary bearing box 17 of the screw conveyor 2. Rubber skirt 5
The head portion 5A surrounds the entire solid content discharge portion including the solid content discharge port 8 at an appropriate interval from the outside.
On the other hand, the lower end surface of the lower portion of the cylindrical portion 5B is opened to form an opening 5C.

Below the opening 5C of the rubber skirt 5,
A cleaning drainage tank 6 and a drainage pump 7 are provided for receiving the cleaning drainage dropped from the rubber skirt 5 penetrating the opening of the gantry 13 and transporting it to the wastewater treatment facility.
The cleaning waste liquid discharged from the separated liquid discharge port 16 to the outside is introduced into the cleaning waste liquid tank 6 (not shown) and is transferred together with the waste water treatment facility.

On the outer side of the shoulder portion 5D which is the boundary portion between the head portion 5A of the rubber skirt 5 and the cylindrical portion 5B, four peeling mechanisms 1 are provided.
5, 16, ... Are provided with 90 ° center distribution.
The four peeling mechanisms 15, 16 ... Are provided with four cylinders 15A, 16A.
, And four pistons 15B, 16B, ..., And four hinges 15C, 16C, ... For fixing the cylinders 15A, 16A .. to the casing CG (see FIG. 1).
The shape of the tips of the four pistons 15B, 16B ... Is disc-shaped as shown in FIG. 1, and the tips are embedded or baked in the rubber skirt 5. With such a structure, the wear resistance and elasticity of rubber can be effectively utilized. The number of the peeling mechanisms 15, 16 ... Installed not only on the upper outer periphery of the rubber skirt 5, but may be plural on the lower outer periphery as necessary. Four peeling mechanisms 15, 1
Although hydraulic pressure, pneumatic pressure, or electricity can be used as the drive source of 6 ..., In this embodiment, the air pressure supplied from the compressor is used as the drive source. For details of the peeling mechanism 15, 16 ... of the rubber skirt 5, refer to the contents of Japanese Patent Application No. 2000-154666 disclosed by the inventors.

The pedestal 13 is a pedestal for arranging and fixing the above-mentioned main components and pipes thereon, and has a quadrangular plane shape (not shown), but may be a triangular shape. Stand 1
A beam for fixing the pillar 13A and a main motor (not shown) is provided on the upper portion of the No. 3. In the lower part, a plurality of anti-vibration devices 13B (for example, anti-vibration device with built-in anti-vibration rubber) are provided to support the vibration of the vertical decanter centrifuge body so as not to transfer it to the factory floor (foundation) There is.

Next, with reference to FIGS. 1 to 4, the structure of the cleaning liquid supply pipe, which is the cleaning device for the vertical decanter centrifuge according to the present invention, and its mounting structure will be described in detail. First, the through hole H formed in the screw blade 2A for detachably inserting the cleaning liquid supply pipes 30, 31 ... Shown in FIG. 1 will be described with reference to FIG. Incidentally, FIG.
(A) is a figure which shows the position of the through-hole for inserting the washing | cleaning liquid supply piping pierced by the screw blade when planarly seeing a screw conveyor, FIG.2 (b) is a longitudinal cross-sectional view of a screw conveyor. is there.

As can be seen from FIG. 2 (a), the through hole H has the screw blades 2A screwed to the center of the screw shaft 2B at an angle of 60 degrees when the screw conveyor is viewed in plan. Six holes are provided at a position near the axis 2B. The shape of the through hole H is shown in FIG.
As shown in (a) and FIG. 4, it has a shape in which an arc along the outside of the screw shaft 2B and an inverted U-shape are integrated.

Thus, the through hole H is formed in the screw shaft 2
By providing the screw blade 2A, which is centered at an angle of 60 degrees with respect to the center of B, near the screw shaft 2B, not only the positioning of the hole when processing the through hole H becomes easy, Cleaning liquid supply pipe 30,
The entire inner surface of the rotary bowl 4 and the screw blades 2A can be suitably washed by the synergistic effect with the jet angle of the washing liquid jetted from 31 ... If the angle to be distributed to the center is less than 60 degrees, the man-hour will be too large and the processing cost will be high. On the contrary, if it is distributed to exceed 60 degrees, an injection hole with a wide spray angle of the cleaning liquid is required. It is desirable to set the distribution angle to 60 degrees because unwashed portions are likely to occur in the washed portion.

Next, the position of the through hole H to which the cleaning liquid supply pipe is attached will be described with reference to FIG. Cleaning liquid supply pipe 3 when the screw conveyor 2 is viewed from the side
The position of the through hole H into which 0, 31 ... Is inserted is shown by the center line in FIG. As can be seen from this figure, a through hole H is provided in parallel with the axis of the stock solution slurry supply pipe 1. That is, since the cleaning liquid supply pipes 30, 31, ... Are provided in the longitudinal direction of the screw conveyor 2, it becomes easy to insert the cleaning liquid supply pipes 30, 31 ,.
It becomes easy to center the cleaning liquid supply pipes 30, 31 ... With respect to the through holes H. Further, by providing the cleaning device for cleaning the inside of the rotary bowl 4 by injecting the cleaning liquid from the injection holes of the cleaning liquid supply pipes 30, 31 ... Main body inserted in the through hole H, there has been a conventional problem. Since the upper end plate of the rotating bowl has no opening for cleaning, it is not necessary to open the entire upper end plate of the rotating bowl and disassemble the screw conveyor from the rotating bowl for cleaning, reducing the time required for cleaning work. it can.

Next, the structure of the cleaning liquid supply pipe according to the present invention will be described with reference to FIG. Although the six cleaning liquid supply pipes 30, 31, ... Are used in the present embodiment, since all six have the same structure, only one cleaning liquid supply pipe 30 will be described. Note that FIG. 3A is an overall configuration diagram of the cleaning liquid supply pipe inserted in the through hole.
(B) is a front view of the cleaning liquid supply pipe body, that is, FIG.
It is a BB arrow line view of (a).

As shown in FIG. 3A, the cleaning liquid supply pipe 30 which is a cleaning device has a flange portion 30A, a flexible tube 30B which is a flexible pipe made of rubber, a swivel joint 30C, and a positioning member 30D. And a main part of the cleaning liquid supply pipe body 30E.

The flange portion 30A is provided with a high pressure liquid (for example, 3
A cleaning liquid for cleaning the machine is introduced by flange connection with a pipe of ˜5 MPaG). The flange portion 30A and the swivel joint 30C are connected by a flexible pipe, for example, a flexible tube 30B made of rubber. If the long flexible tube 30B is used, the degree of freedom of movement of the pipe is increased, and the work for inserting the cleaning liquid supply pipe 30 into the through hole H provided in the screw blade 2A is facilitated. A cleaning liquid supply pipe body 30E is connected to the downstream side of the swivel joint 30C. As swivel joint 30C is used, cleaning liquid supply pipe body 3
The degree of freedom of rotation of 0E becomes large, and the cleaning liquid supply pipe main body 3
The work of inserting 0E into the through hole H of the screw blade 2A can be easily performed.

The cleaning liquid supply pipe body 30E is shown in FIG.
As shown in FIG. 2, the cleaning liquid supply pipe 1 is a pipe having a plurality of injection holes H '(15 in this embodiment) for injecting a high-pressure cleaning liquid. The number is determined in accordance with the cleaning capacity per bottle, and the opening portion (groove) 30G having an appropriate width along the circumferential direction such that the cleaning liquid is sprayed at an angle of 60 degrees or more around the center of the spray hole H '. Is provided. The number of the injection holes H ′ is required to be (the number of the screw blades 2A + 1) with respect to the number of the screw blades 2A, and the position of the injection holes H ′ is along the longitudinal direction of the cleaning liquid supply pipe body 30E. Each injection hole H'is provided so as to be located at the center position between the screw blades 2A (however, since it is schematically shown in FIG. 1, the number of injection holes and the like are not accurately displayed). The end portion 30F of the cleaning liquid supply pipe body 30E is
It is sealed.

Thus, the injection hole H'of the cleaning liquid supply pipe
Is determined in accordance with the cleaning ability per cleaning liquid supply pipe, and is opened with an appropriate width along the circumferential direction so that the injection angle of the cleaning liquid is 60 degrees or more around the injection hole (groove). Is provided), it is possible to prevent the injection hole from being blocked by dust in the water, and to set the injection angle to 60
Since it can be set to more than a degree, the inner surface of the rotating bowl and the blades of the screw can be suitably washed.

Next, a positioning member 30D as shown in FIGS. 3 (a) and 3 (b) is provided on the upper portion of the cleaning liquid supply pipe main body 30E. The positioning member 30D will be described with reference to FIG. explain. 4 (a) is a perspective view showing a fitting state of the positioning member and the through hole in a state where the direction of injection of the cleaning liquid in the cleaning liquid supply pipe is fixed, and FIG. 4 (b).
[Fig. 4] is a view taken along the line AA of Fig. 3 (a). Positioning member 3
0D is composed of a collar portion FG and a cylindrical bush portion BH. The shape of the collar portion FG when viewed in plan is as shown in FIG.
As shown in FIGS. 4A and 4B, the screw blade 2
The shape is similar to the through hole H formed in A, and has a shape in which an arc along the outside of the screw shaft 2B and an inverted U shape are integrated. Further, the bush portion BH has a circular shape. The flange portion FG has a larger area than the bush portion BH when viewed in a plane. Further, in the positioning member 30D, the inner surface of the through hole H at the uppermost portion of the screw blade 2A and the outer side of the bush portion BH of the positioning member 30D are fitted to each other, and the flange portion having substantially the same curvature from the center of the screw shaft 2B. The rotation of the cleaning liquid supply pipe 30 is restricted only when the engagement surface F of the FG and the outer surface of the screw shaft 2B are engaged so that the direction of injection of the cleaning liquid from the cleaning liquid supply pipe body 30E can be positioned in a desired direction. Has been done.

As described above, the positioning member 30D is provided on the upper portion of the cleaning liquid supply pipe main body 30E, and the positioning member 30D is detachably fitted into the uppermost through hole H provided near the screw shaft 2B of the screw blade 2A. When the member 30D is fitted in the through hole H, the injection hole H'is formed in the rotating bowl 4
Since the through-hole H and the positioning member 30D are formed so as to face the inner surface direction, the injection direction of the cleaning liquid can be reliably fixed and the cleaning liquid supply pipe 30 can be held so as not to fall.

As shown in FIG. 1, the six cleaning liquid supply pipes 30, 31 ... Having the above-described structure respectively have openings of the lid 18 surrounding the upper part of the rotary bowl 4 and the rotary bowl 4.
It is inserted into the screw conveyor 2 through the opening of the upper end plate 10 provided in the upper part of the above, further through the through hole H provided in the screw blade 2A. Although only two cleaning liquid supply pipes 30 and 31 are shown in FIG. 1, in reality, three cleaning liquid supply pipes divided into two bundles are passed through the openings provided separately. Six cleaning liquid supply pipes 30, 31, ... Are inserted into the through holes H. The positioning member shown in FIG. 1 schematically illustrates a state in which the cleaning liquid supply pipes 30 and 31 are inserted into the through holes H of the screw blades 2A for easy understanding. Therefore, the positioning member 30D as shown in FIG. Not represented.

The lid 1 that surrounds the upper part of the rotating bowl 4 in this way
8 and the upper end plate 10 provided on the upper part of the rotating bowl 4 is provided with an opening for cleaning, which is a conventional problem because the upper end plate of the rotating bowl has no opening for cleaning. Since the entire upper end plate of the rotating bowl is opened and the screw conveyor is not disassembled from the rotating bowl for cleaning, the time required for cleaning work can be shortened.

Next, the operation of the vertical decanter centrifuge having the cleaning device having the above construction will be described with reference to FIG. 1. Pre-cleaning (cleaning is performed without attaching a cleaning device) The cleaning liquid is stored in the rotating bowl 4 through the stock solution slurry supply pipe 1 and the flow dividing rib plate 3 in the rotating bowl 4 that rotates at high speed (for example, 3000 to 5000 min ⁻¹ ). It is supplied to a predetermined position of the cylindrical portion 4B. The cleaning liquid supplied from the flow dividing rib plate 3 to the cylindrical portion 4B receives a centrifugal force and forms a liquid surface on the inner surface side of the rotating bowl 4. The solid content that has been washed and settled during that time is scraped up to the frustoconical section 4A side by the screw blade 2A of the screw conveyor 2 and is drained before being conveyed to the solid content discharge port 8. The solid content dewatered in the truncated cone portion 4A is discharged horizontally in the bell jar-shaped rubber skirt 5 from the solid content outlet 8 provided on the small diameter end side of the truncated cone portion 4A. The solid content discharged in the horizontal direction is lost by colliding the momentum given by the centrifugal force with the inner wall of the rubber skirt 5. At this time, in the case of a sticky or adhesive solid content, even if the material is rubber different from metal, it adheres to the inner wall. Therefore, along the boundary between the head portion 5A and the cylindrical portion 5B at the upper outer periphery of the rubber skirt 5, 90
Peeling mechanisms 15 and 16 provided with four by each central distribution
... cylinders 15A, 16A ... pistons 15B, 16
By operating B ... linearly at regular intervals to temporarily deform the shape of the rubber, the solid content adhering to the inner surface of the upper portion of the rubber skirt 5 can be suitably peeled off from the inner wall. The solid content dropped in the cleaning drainage tank 6 is transferred to the wastewater treatment facility together with the cleaning drainage by rotating the drainage pump 7. On the other hand, the separated liquid separated in the rotary bowl 4 passes through the separated liquid overflow port provided in the upper end plate 10 of the cylindrical portion 4B of the rotary bowl 4, overflows the weir plate 10B, and comes out of the separated liquid discharge port 16. It is discharged to the outside as cleaning drainage. The cleaning effluent is transferred to the cleaning effluent tank 6 whose connection pipe is not shown, and is transferred to the effluent treatment facility by rotating the drainage pump 7.

2. Main cleaning (cleaning is performed by attaching a cleaning device) When the preliminary cleaning is completed, the power switch is turned off and the vertical decanter centrifuge is stopped (the rotation of the rotating bowl 4 is stopped). When the vertical decanter centrifuge is stopped, the washing liquid supply pipes 30, 31 ... (Only two pipes are shown in FIG. 1, but actually six pipes) are respectively provided with openings of the lid 18 which cover the upper part of the rotary bowl 4. , And the upper end plate 10 provided on the upper part of the rotary bowl 4 and then fixed through the through holes H provided in the screw blades 2A of the screw conveyor 2. At this time, screw blade 2
Inner surface of through hole H at the top of A and bush portion BH of 30D
, And the outer surface of the screw shaft 2B is engaged with the engaging surface F of the flange portion FG having substantially the same curvature from the center of the screw shaft 2B. Rotation of the cleaning liquid supply pipe body 3
It can be positioned so that the injection direction of the cleaning liquid of 0E is a desired direction. 3-5M from pump not shown
The cleaning liquid pressurized to PaG is the cleaning liquid supply pipe main body 30.
E, 31E, ..., and are injected from the injection hole H'in the rotating bowl 4 at an injection angle of 60 degrees. By injecting the cleaning liquid in this manner, the inside of the screw blade 2A and the rotating bowl 4 can be suitably cleaned. The cleaning liquid supply pipes 40 and 41 (only two pipes are shown in FIG.
(Actually four) are separately provided, and the cleaning liquid supply pipes 40, 41 are introduced from the upper openings 19, 20 of the rubber skirt 5.
If only two are shown in FIG. 1, but four are actually inserted and the inside of the rubber skirt 5 is washed, the entire apparatus can be washed more favorably due to the synergistic effect. Similar to the pre-cleaning, the cleaning waste liquid dropped from the rubber skirt 5 to the cleaning waste liquid tank 6 is transferred to the waste water treatment facility as the cleaning waste liquid by rotating the drain pump 7.

Next, a method for evaluating the cleaning inside the rotary bowl 4 after cleaning will be described. When the cleaning is completed, the six cleaning liquid supply pipes 30, 31, ... Are extracted from the through holes H of the screw blades 2A, the fiber scope is inserted into the through holes H, and the place where the cleaning effect is desired to be confirmed is visually observed. Then, the cleaning effect is judged from the observation result. You can use a videoscope instead of a fiberscope here, but the fiberscope is cheaper and only needs to supply light (as the videoscope has to supply more electricity). Is preferred.

By thus inserting the fiberscope into the through-hole of the screw blade and visually observing and evaluating for cleaning, the cleaning effect can be confirmed without disassembling the machine after machine cleaning. Therefore, the cleaning time can be shortened.

Next, the cleaning of the rubber skirt 5 will be described in some detail. For cleaning the inside of the rubber skirt 5, the openings 19 and 20 of the opening / closing windows provided in the head 5A of the rubber skirt 5 as shown in FIG. 1 (only two are shown in FIG. ) To four cleaning liquid supply pipes 40, 41 ...
To the shoulder 5D of the rubber skirt 5 and the rotary bearing box 17 of the screw conveyor 2 which are the most difficult to wash due to solids adhering to the inside of the rubber skirt 5 while looking into the interior through a viewing window (not shown). Towards high pressure water (eg 3-5M
And then wash it.

In this way, the cleaning liquid supply pipe 4 is fed from the upper openings 19 and 20 of the rubber skirt 5 to the inside.
0, 41, ... Are inserted and the injection holes H ′ of the cleaning liquid supply pipes 40, 41, ... Are arranged so that the shoulder portion 5D of the rubber skirt 5 and the rotary bearing box 17 of the screw conveyor 2 can be cleaned. It is possible to suitably clean the part that is the most difficult to clean due to the adhesion of the minute.

Although the vertical decanter centrifuge according to the present invention has been described above, the vertical decanter centrifuge according to the present invention is not limited to this, and deviates from the technical scope of the present invention. It can be carried out by appropriately changing it within the range not to do. For example, a turbidimeter or a densitometer may be used in combination with the fiberscope instead of the fiberscope for cleaning evaluation.

[0053]

According to the present invention having the above-mentioned structure and operation, the following effects of the invention can be obtained. 1) According to the invention described in claim 1, in the vertical decanter centrifuge, the screw is provided with a through hole for inserting the cleaning liquid supply pipe from the opening of the upper end plate of the rotating bowl substantially parallel to the screw shaft. By providing a cleaning device for cleaning the inside of the rotating bowl by injecting the cleaning liquid from the injection hole of the cleaning liquid supply pipe inserted in the through hole by being drilled in the screw blades of the conveyor, it becomes a conventional problem. Since there is no opening for cleaning on the upper end plate of the rotating bowl, it is not necessary to open the entire upper end plate of the rotating bowl and disassemble the screw conveyor from the rotating bowl for cleaning. Can be shortened. 2) According to the second aspect of the invention, the cleaning liquid supply pipe is provided with a positioning member which is detachably fitted into the uppermost through hole provided near the screw shaft of the screw blade. When fitted into the through hole,
By forming the through hole and the positioning member so that the injection hole faces the inner surface of the rotating bowl, it is possible to reliably fix the injection direction of the cleaning liquid and hold the cleaning liquid supply pipe so as not to drop. it can. 3) According to the invention as set forth in claim 3, the through hole for inserting the cleaning liquid supply pipe is provided in the screw blade at a position divided by 60 degrees in a plan view, so that the through hole is processed. Not only can the positioning be facilitated, but the inner surface of the rotating bowl and the entire screw blade can be suitably washed due to the synergistic effect with the jetting angle of the washing liquid jetted from the washing liquid supply pipe. 4) According to the invention described in claim 4, the number of the injection holes of the cleaning liquid supply pipe is determined corresponding to the cleaning ability per cleaning liquid supply pipe, and the injection angle of the cleaning liquid is centered around the injection hole. Since the opening is opened at an appropriate width along the circumferential direction to be 60 degrees or more, it is possible to prevent the injection hole from being blocked by dust in the water and the like, and the injection angle can be 60 degrees or more. The inner surface of the rotating bowl and the blades of the screw can be suitably washed. 5) According to the invention of claim 5, a cleaning liquid supply pipe is inserted from the upper opening of the rubber skirt to the inside so that the shoulder part of the rubber skirt and the rotary bearing box of the screw conveyor can be cleaned. By arranging the direction of the injection holes of the supply pipe, it is possible to preferably clean the portion that is the most difficult to clean due to adhesion of solids and the like. 6) According to the invention described in claim 6, the fiberscope is inserted into the through hole of the screw blade for the cleaning evaluation, and the visual observation and evaluation are performed. Therefore, the machine is disassembled after the machine cleaning. Since the cleaning effect can be confirmed without doing so, the cleaning time can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the outline of the mounting position of a cleaning device inside a vertical decanter centrifuge according to the present invention.

FIG. 2 (a) is a diagram showing the positions of through holes for inserting the cleaning liquid supply pipes formed in the screw blades when the screw conveyor is viewed in plan. (B) It is a longitudinal cross-sectional view of a screw conveyor.

FIG. 3A is an overall configuration diagram of a cleaning liquid supply pipe inserted in a through hole. (B) It is a front view of the cleaning liquid supply piping main body.

FIG. 4 (a) is a view showing a fitting state of the positioning member and the through hole in a state where the cleaning liquid jetting direction of the cleaning liquid supply pipe is fixed. (B) It is an AA arrow line view of Fig.3 (a).

FIG. 5 is a vertical sectional view showing an embodiment of a conventional vertical decanter type centrifugal separator.

[Explanation of symbols]

1 Stock Liquid Slurry Supply Pipe 2 Screw Conveyor 2A Screw Blade 2B Screw Shaft 3 Dividing Rib Plate 4 Rotating Bowl 4A Frustum Conical Part 4B Cylindrical Part 5 Rubber Skirt 5A Head 5B Cylindrical Part 6 Cleaning Drainage Tank 7 Drainage Pump 8 Solids Discharge port 10 Upper end plate 11 Intubation hole 12 Differential speed device 13 Frame 13A Column 13B Vibration suppressor (anti-vibration rubber) 14 Differential speed motor 15, 16 Separation mechanism 15A, 16A Cylinder 15B, 16B Piston 15C, 16C Hinge 30, 31 Cleaning liquid supply pipe 40, 41 Cleaning liquid supply pipe (for rubber skirt cleaning) 30A Flange portion 30B Flexible tube 30C Swivel joint 30D Positioning member 30E Cleaning liquid supply pipe body 30F End portion 30G Opening (groove) FG Collar portion BH Bushing portion F Engagement Surface H Through hole H'Injection hole

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4D057 AA05 AA07 AB01 AD01 AF03                       BA36 BC11 BC16 BC17

Claims (6)

[Claims] 1. A frustoconical portion having a solid content outlet on the lower small diameter end side, and a conical portion connected to the upper large diameter end side of the frustoconical portion,
A rotating bowl consisting of a cylindrical portion having a separating liquid overflow port provided with a weir plate on the upper end plate and a coaxially provided inside the rotating bowl, and having a slight speed difference with the rotating bowl through a speed difference device. A rotating screw conveyor, a stock solution slurry supply pipe that is inserted into an axial center part from an insertion hole of an upper end plate of a cylindrical portion of the rotating bowl, and supplies a stock solution slurry to the cylindrical portion, and a lower end portion of the stock solution slurry supply pipe. A vertical type having a flow-dividing rib plate connected in a radial direction in the rotating bowl and connected to the above, and a bell jar-shaped rubber skirt provided so as to surround the entire solid content discharge portion including the solid content discharge port from the outside. In the decanter centrifuge, a through hole for inserting the cleaning liquid supply pipe from the opening of the upper end plate into the screw shaft substantially in parallel is formed in the screw blade of the screw conveyor, and the through hole is formed. Vertical decanter centrifuge, characterized by comprising a cleaning device for cleaning the inside of the rotary bowl by injecting washing liquid from the injection hole of the cleaning liquid supply pipe that inserted in the hole. 2. The cleaning liquid supply pipe is provided with a positioning member that is removably fitted into an uppermost through hole provided near the screw axis of the screw blade, and the positioning member is fitted into the through hole. The vertical decanter centrifuge according to claim 1, wherein the through hole and the positioning member are formed so that the injection hole faces the inner surface of the rotary bowl when being rotated. 3. The vertical decanter according to claim 1, wherein the through hole into which the cleaning liquid supply pipe is inserted is provided at a position centered at 60 degrees in a plan view. Centrifuge. 4. The number of injection holes of the cleaning liquid supply pipe is determined in accordance with the cleaning ability required for each cleaning liquid supply pipe, and the injection angle of the cleaning liquid is 60 degrees or more centered on the injection hole. The vertical decanter centrifuge according to any one of claims 1 to 3, wherein the vertical decanter centrifuge is opened with an appropriate width along the circumferential direction. 5. The direction of the injection hole of the cleaning liquid supply pipe so that the cleaning liquid supply pipe is inserted into the inside from the upper opening of the rubber skirt and the shoulder part of the rubber skirt and the rotary bearing box of the screw conveyor can be cleaned. The vertical decanter centrifuge according to any one of claims 1 to 4, further comprising: 6. The cleaning evaluation is characterized in that a fiberscope is inserted into the through hole of the screw blade and visually observed and evaluated.
The vertical decanter centrifuge according to any one of claims 4 to 5.