JP2000354780A - Medium agitation type pulverizer and its washer and its washing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make washing work efficient and to heighten the rate of actual operating time. SOLUTION: This medium agitation type pulverizer is provided with: a cylindrical vessel in which a slurry inlet and a slurry outlet 16 are formed near one end part and near the other end part thereof respectively; an agitator 9 relatively rotatably arranged in the cylindrical vessel so as to extend in the length direction of the cylindrical vessel; a driving means for subjecting the agitator 9 to rotary driving; and a screen 18 provided for the slurry outlet 16 of the vessel. Into a pulverizing chamber formed between the cylindrical vessel and the agitator 9, pulverizing mediums are filled, and while the agitator is rotated relatively to the vessel, slurry is sent from a slurry inlet and is discharged from a slurry outlet 16. Plural washing liquid jetting nozzles 28 are installed so as to be opposite to the screen 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a medium stirring type disperser. In particular, the present invention relates to cleaning the exit screen in a media agitator.

[0002]

BACKGROUND ART Minerals, pigments, dyes, chemicals, fillers,
Finely pulverize magnetic materials such as ferrite, ceramic materials, or disperse fine particles of these materials,
For example, in order to adjust coatings, printing inks, pigments, coating materials for magnetic tapes, rubbers, adhesives, cosmetics, medicines such as paints, etc., medium stirring type pulverizers called sand mills or bead mills are frequently used. .

[0003] This type of medium stirring type pulverizer has a cylindrical vessel in which a slurry inlet is formed near one end and a slurry outlet is formed near the other end, and extends in the longitudinal direction of the cylindrical vessel. And a stirring member disposed relatively rotatably in the cylindrical vessel. The stirring member is
One end in the axial direction extends outward from the cylindrical vessel in the axial direction, and is driven to rotate by the driving means. A screen is provided at the slurry outlet of the vessel, and a grinding chamber formed between the cylindrical vessel and the stirring member is filled with a grinding medium such as glass beads and the stirring member is rotated relative to the vessel. The slurry is fed from the slurry inlet and discharged through the screen from the slurry outlet.

When this medium stirring type pulverizer is used, for example, for preparing paints, it is often the case that substances of different types are dispersed in a relatively small lot. In such a case,
In order to use the same pulverizer for dispersing one substance after dispersing one substance, the pulverizer needs to be washed.
This washing is performed by introducing a washing liquid from the slurry inlet while operating the pulverizer. According to this cleaning method, the pulverizing medium and the inside of the pulverizing chamber can be sufficiently cleaned, but the screen at the slurry outlet becomes incompletely cleaned. In particular, since the cleaning effect does not reach the outer surface of the screen where the solid content of the slurry tends to adhere, the screen needs to be removed and washed separately. However, when the screen is removed, the crushing medium flows out of the vessel, so that it is necessary to refill the crushing medium after the washed screen is attached, and there has been a problem that the working time becomes longer.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when a plurality of different substances are dispersed using a medium stirring type pulverizer, a dispersion operation for one substance is switched to a dispersion operation for another substance. It is an object of the present invention to provide a medium stirring type pulverizer capable of improving the efficiency of a cleaning operation at the time and increasing the ratio of an actual operation time, and a cleaning apparatus and a cleaning method thereof.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention provides a plurality of cleaning liquid spray nozzles facing a screen. That is, a medium stirring type pulverizer according to the present invention includes a cylindrical vessel in which a slurry inlet is formed near one end and a slurry outlet is formed near the other end, and a cylindrical vessel that extends in the longitudinal direction of the cylindrical vessel. A stirrer disposed in a cylindrical vessel so as to be rotatable relative to the cylindrical vessel, a driving means engaged with one axial end of the stirrer to rotationally drive the stirrer, and a slurry outlet of the vessel A screen provided between the cylindrical vessel and the stirring device is filled with a grinding medium formed between the cylindrical vessel and the stirring device, and the slurry is rotated while rotating the stirring device relative to the vessel. This is a type in which the slurry is fed from the inlet and the slurry is discharged from the slurry outlet. In the present invention, a plurality of cleaning liquid jet nozzles are provided to face the screen in this type of medium stirring type pulverizer.

[0007] In a preferred embodiment of the present invention, the screen is cylindrical, and is arranged so that the outer periphery faces the grinding chamber at the slurry outlet. An outlet pipe is provided inside the cylindrical screen so as to extend in the axial direction, a sleeve is provided so as to surround the outlet pipe, and a nozzle is formed in the sleeve. In this case, it is preferable that the inner end in the axial direction of the cylindrical screen is closed by a screen cover plate, and the sleeve is provided with an internal cleaning nozzle extending through the screen cover plate and extending into the vessel. The stirrer of the crusher has a plurality of stirrers protruding radially outward on a peripheral surface thereof, and a fixing member protruding radially inward at a position not interfering with the stirrer on the inner peripheral surface of the vessel. Is preferably arranged.

[0008] Still another embodiment of the present invention is suitable for a small-sized pulverizer in which a space for disposing a cleaning liquid injection nozzle facing a screen is not available. In this embodiment of the present invention, a medium stirring type is used. An apparatus for cleaning a screen in a crusher is provided. This washing device has a medium stirring type pulverizer in which an outlet pipe has a flange portion closing an axial outer end portion of a cylindrical screen, and the screen can be removed from the screen while leaving the screen on the vessel side. A nozzle pipe having a mounting flange having substantially the same shape and dimensions as the flange portion of the outlet pipe, and a nozzle pipe extending in an axial direction from one surface of the mounting flange is provided; And a cleaning liquid introduction pipe for supplying a cleaning liquid to the nozzle pipe through the mounting flange from the other surface side of the mounting flange.

The present invention also provides a method for cleaning a screen in a medium stirring type pulverizer.
The screen is left on the vessel side, the outlet tube is removed from the screen, and a washing nozzle is inserted into the screen to wash the screen on the slurry outlet side by spraying a cleaning liquid onto the screen from the outlet side.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a first embodiment of the present invention. A medium stirring type pulverizer 1 includes a cylindrical vessel 2 having flanges 3 and 4 formed at both ends in an axial direction. End plates 5 and 6 are attached to flanges 3 and 4 at both ends of 2 respectively. The vessel 2 is arranged so that the central axis of the cylindrical shape is oriented in the horizontal direction.

A stirrer including a cylindrical rotating body 8 and a stirrer 9 is disposed inside the vessel 2. Rotating body 8
Has a drive shaft 8a formed at one end thereof and extending outside the vessel 2 through the end plate 5 of the vessel 2. Vessel 2
The supporting member 11 is fixed to the end plate 5 of the supporting member 11.
The bearing 14 provided on the supporting member 8 rotatably supports the drive shaft 8 a of the rotating body 8 with respect to the vessel 2. A pulley 13 is attached to an end of the drive shaft 8a, and the drive shaft 8a is driven to rotate by a power source (not shown) via a belt 12 wound around the pulley 13.

The stirring member 9 is attached to the outer periphery of the rotating body 8 so as to protrude radially outward at an appropriate interval.
As shown in FIG. 1, a fixing member 10 is attached to the inner periphery of the cylindrical vessel 2 at a position between the stirring members 9 provided on the rotating body 8 so as to protrude inward in the radial direction. The rotating body 8 has a cylindrical recess 17 formed inward from an axial end opposite to the drive shaft 8a, and a cylindrical separation screen 18 is disposed in the recess 17. The screen 18 has one end in the axial direction and the end plate 6 of the vessel 2.
And is supported by the end plate 6. An outlet pipe 16 is inserted into the screen 18. An inlet pipe 15 is disposed at an end of the vessel 2 near the end plate 5.

A grinding chamber 7 is formed between the vessel 2 and the rotating body 8. The crushing chamber 7 is filled with a crushing medium such as glass beads 2a. In operation, a solid slurry is introduced from the inlet pipe 15 while rotating the rotating body 8 of the stirring device. The introduced slurry reaches the concave portion 17 formed at the end of the rotating body 8 while receiving frictional force between the crushing media 2a stirred by the stirring member 9 of the stirring device,
It is discharged from the outlet pipe 16 through the screen 18. The solid content contained in the slurry is pulverized into fine particles by receiving a frictional force between the pulverizing media 2a. During this time, the slurry is subjected to a stirring action, and the crushed solid fine particles are uniformly mixed in the slurry to be in a dispersed state. The screen 18 serves to separate the slurry from the grinding medium 2a at the outlet of the grinding device 1.

Referring to FIG. 2A, the screen 18
Is composed of a cylindrical screen member 19, an attachment member 19 a fixed to one end of the screen member 19, and an end plate 29 for closing the other end of the screen member 19. The mounting member 19a includes a hollow cylindrical portion and an annular flange formed at one end of the cylindrical portion. The cylindrical portion is inserted into a circular hole formed in the end plate 6 of the vessel 2, and the annular flange is bolted or the like. It is fixed to the end plate 6. The outlet pipe 16 has a mounting member 16a including a cylindrical portion and an annular flange formed at one end of the cylindrical portion. The cylindrical portion of the mounting member 16a is fitted into a shaft hole of the cylindrical portion of the mounting member 19a, and a bolt or the like is provided. Is fixed to the mounting member 19a of the screen 18 by the fixing means, so that the screen 18 can be detachably attached to the end plate 6 of the vessel 2. As shown in FIG. 2A, the outlet pipe 16 extends inside the screen member 19, and the end 20 opens into the screen member 19. Outer tube 16 has an outer tube or cannula 24 radially spaced outside thereof.
One end of the sleeve tube 24 is connected to the outlet tube 1 by a ring-shaped end plate 26.
6 is connected to the end. The other end of the sleeve 24 is fixed to the end of the cylindrical portion of the mounting member 16a. Thus, an annular space 31 is formed between the outlet tube 16 and the sleeve tube 24. This annular space 31 is connected to the cleaning liquid supply pipe 21 penetrating through the flange portion of the mounting member 16a.

As shown in FIG. 2B, a plurality of nozzles 22 are formed on the wall surface of the sleeve 24 at intervals in the circumferential direction. As can be understood from FIG. 2A, the nozzles 23 are formed at intervals in the axial direction of the sleeve 24 as well. End plate 2
Between the end plate 29 and the end plate 29 of the screen 18, the inlet 30 opens into the space 31, and the nozzle 32 opens into the recess 17 of the rotating body 8 which is a part of the crushing chamber in the vessel 2. 28 are arranged. As shown in FIG. 2B, a plurality of nozzle tubes 28 are provided at intervals in the circumferential direction. Further, the end plate 26 is formed with a nozzle 23 that opens toward the end plate 29. A discharge pipe provided with an outlet valve 36 for discharging the residual liquid is provided below the outlet end of the vessel 2.

When the processing of the slurry containing one substance as a solid content is completed, and then the processing of the slurry containing another substance as a solid content is performed, the discharge valve 36 is opened to remove the residual slurry in the vessel 2. After discharging, it is necessary to clean the inside of the crusher 1. To perform this cleaning, a cleaning liquid is introduced into the pulverizing chamber 7 from the slurry inlet 15 while rotating the stirring device. The cleaning liquid is formed at the end of the stirring member 8 while cleaning the inner wall surface of the vessel 2, the rotating body 8 of the stirring device, the stirring member 9 and the fixed member 10, and the grinding medium 2a filled in the grinding chamber 7. After passing through the recessed portion 17, it is discharged from the outlet pipe 16 through the eyes of the screen member 19 of the separation screen 18. In parallel with the introduction of the cleaning liquid from the inlet pipe 15, the cleaning liquid is also introduced from the cleaning liquid introduction pipe 21. Most of the cleaning liquid introduced from the cleaning liquid introduction pipe 21 is the nozzle 2
2 is sprayed toward the exit-side surface of the screen member 19 to wash off the deposits on the exit side surface of the screen member 19. Further, the remaining portion of the cleaning liquid is injected into the recess 17 through the nozzle tube 28 on the end plate 29 of the screen 18,
The inner wall surface of the concave portion 17 and the crushing medium 2a in the concave portion 17 are washed.

Thus, with the structure of this embodiment of the present invention, the screen can be cleaned without removing the screen 18. FIG. 3 and FIG. 4 show a second embodiment of the present invention. Parts corresponding to the respective parts of the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is applicable to a small pulverizer in which a space for installing a nozzle mechanism inside a screen is not available, and an outlet pipe 16 ends at an inner end of a mounting member 16a.
As in the previous embodiment, the mounting member 16 a of the outlet pipe 16 is fixed to the end plate 6 of the vessel 2 through the mounting member 19 a of the screen member 19 by the bolt 33.
The mounting member 19 a of the screen member 19 is fixed to the end plate 6 of the vessel 2 by bolts 37.

Referring to FIG. 4, the outlet pipe 16 in FIG. 3 is detached from the end plate 6 of the vessel 2 with the attachment member 19a of the screen member 19 together with the attachment member 16a. A nozzle device is attached to the position of the outlet pipe 16 and the attachment member 16a.
The nozzle device includes a mounting member 34 including a cylindrical portion fitted into the cylindrical portion of the mounting member 19a of the screen member 19 and a flange formed at one end of the cylindrical portion. At the opposite end, a cylindrical nozzle member 37 having one end closed is attached. The nozzle member 37 has a nozzle opening 22 formed on the peripheral surface of the cylinder and facing outward in the radial direction, and a nozzle opening 23 formed on the end surface and parallel to the axial direction of the cylinder. The inside of the cylindrical nozzle member 37 is connected to the cleaning liquid introduction pipe 21 penetrating the mounting member 34. The cleaning liquid introduction pipe 21 is provided with an opening / closing valve 35. The nozzle device is provided with the outlet pipe 16 and the mounting member 16a thereof removed.
The mounting member 34 is mounted to the end plate 6 of the vessel 2 through the mounting member 19a of the screen member 19 by the bolt 33.

The operation at the time of cleaning in the second embodiment is the same as that of the previous embodiment in that the cleaning liquid is supplied from the inlet pipe of the vessel 2. Further, it is the same as the previous embodiment in that the outlet side surface of the screen member 19 is cleaned with the cleaning liquid sprayed from the nozzle opening. The difference is that in the second embodiment, the cleaning liquid is not jetted from the nozzle device to the concave member 17 of the rotating body 8 of the stirring device, and the cleaning liquid jetted from the nozzle opening formed on the end face of the nozzle member 37 is the screen 18. This means that the end plate 29 is washed by hitting the exit side wall surface of the end plate 29. In any of the embodiments, the outlet-side surface of the screen member 19 can be cleaned without removing the screen 18. Therefore, the problems of the prior art can be solved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a crusher according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing details of an outlet portion of the crusher according to the embodiment of FIG.

FIG. 3 is a partial cross-sectional view showing details of an outlet portion of a crusher according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of an outlet portion of the crusher shown in a state where a cleaning device is attached to the crusher shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... grinding apparatus, 2 ... vessel, 5, 6 ... end plate, 7 ... grinding chamber, 8 ... rotating body, 9 ... stirring member, 10 ... fixed member, 15 ... Inlet pipe, 16 ...
・ Outlet pipe, 18 ・ ・ ・ Screen, 19 ・ ・ ・ Screen member, 22, 23 ・ ・ ・ Nozzle opening, 24 ・ ・ ・ Cover pipe, 28 ・ ・ ・ Nozzle pipe,

Claims (6)

[Claims] A cylindrical vessel having a slurry inlet formed near one end and a slurry outlet formed near the other end;
A stirrer disposed in the cylindrical vessel so as to extend in the longitudinal direction of the cylindrical vessel and rotatable relative to the cylindrical vessel, and engaged with one axial end of the stirrer; A drive unit for rotating and driving the stirring device, and a screen provided at the slurry outlet of the vessel, wherein a grinding medium formed between the cylindrical vessel and the stirring device is filled with a grinding medium. In a medium stirring type pulverizer configured to feed the slurry from the slurry inlet and discharge the slurry from the slurry outlet while rotating the stirring device relative to the vessel, a plurality of the slurry may be opposed to the screen. A medium agitation type pulverizer characterized by comprising a washing liquid injection nozzle of (1). 2. The crusher according to claim 1, wherein the screen is cylindrical, and an outer periphery is arranged at the slurry outlet so as to face the crushing chamber. A pulverizer characterized in that an outlet pipe is provided so as to extend in the axial direction, a sleeve is provided so as to surround the outlet pipe, and the nozzle is formed in the sleeve. 3. The crusher according to claim 2, wherein an inner end in the axial direction of the cylindrical screen is closed by a screen cover plate, and the vessel extends through the screen cover plate. A crusher provided with an internal cleaning nozzle extending into the inside of the crusher. 4. One of claims 1 to 3
In the crusher described in the item, a plurality of stirring members projecting radially outward on the peripheral surface of the stirring device, the inner peripheral surface of the vessel at a position that does not interfere with the stirring member. A pulverizer characterized in that a fixing member protruding inward in the radial direction is arranged. 5. A cylindrical vessel having a slurry inlet formed near one end and a slurry outlet formed near the other end,
A stirrer disposed in the cylindrical vessel so as to extend in the longitudinal direction of the cylindrical vessel and rotatable relative to the cylindrical vessel, and engaged with one axial end of the stirrer; Driving means for rotating and driving the stirring device, and a screen provided at the slurry outlet of the vessel, wherein the screen is cylindrical, and is arranged so that an outer periphery faces the grinding chamber at the slurry outlet. An outlet pipe is provided so as to open inside the cylindrical screen, and a pulverizing medium is filled in a pulverizing chamber formed between the cylindrical vessel and the agitator, and the agitator is connected to the vessel. The slurry is fed from the slurry inlet while being relatively rotated with respect to and the slurry is discharged from the slurry outlet through the outlet pipe. A cleaning device for the screen in a medium stirring type pulverizer, comprising a flange portion closing an axial outer end portion of the screen, the screen being detachable from the screen while leaving the screen on the vessel side, A nozzle pipe having a mounting flange having substantially the same shape and dimensions as the flange portion of the outlet pipe, a nozzle pipe extending in an axial direction from one surface of the mounting flange is provided, and a plurality of nozzles are formed in the nozzle pipe, A cleaning device, comprising: a cleaning liquid introducing pipe for supplying a cleaning liquid to the nozzle pipe through the mounting flange from the other surface side of the mounting flange. 6. A cylindrical vessel having a slurry inlet formed near one end and a slurry outlet formed near the other end,
A stirrer disposed in the cylindrical vessel so as to extend in the longitudinal direction of the cylindrical vessel and rotatable relative to the cylindrical vessel, and engaged with one axial end of the stirrer; Driving means for rotating and driving the stirring device, and a screen provided at the slurry outlet of the vessel, wherein the screen is cylindrical, and is arranged so that an outer periphery faces the grinding chamber at the slurry outlet. An outlet pipe is provided so as to open inside the cylindrical screen, and a pulverizing medium is filled in a pulverizing chamber formed between the cylindrical vessel and the agitator, and the agitator is connected to the vessel. The slurry is fed from the slurry inlet while being relatively rotated with respect to and the slurry is discharged from the slurry outlet through the outlet pipe. A method for cleaning the screen in a medium stirring type pulverizer, comprising a flange portion closing an axial outer end portion of the screen, wherein the screen can be removed from the screen while leaving the screen on the vessel side, Cleaning the slurry outlet side screen by removing the outlet pipe from the screen while leaving the screen on the vessel side, inserting a cleaning nozzle inside the screen, and spraying a cleaning liquid onto the screen from the outlet side. A method for cleaning a screen in a medium stirring type pulverizer.