JPH0448863Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a horizontally supported cylindrical screen and several stirring blades attached to a rotating shaft that rotates at high speed on its center line to stir the powder raw material supplied inside the cylindrical screen. This invention relates to an agitation type cylindrical screen classifier.

Each particle of the raw material on the inner surface of the cylindrical screen is struck by a stirring blade rotating at high speed and collides with the inner surface of the cylindrical screen, the fine particles pass through the eyes of the cylindrical screen, and the coarse particles bounce back and rotate. It is struck by another stirring blade and again collides with the inner surface of the cylindrical screen. Due to this phenomenon, high-frequency microvibrations persist in each part of the screen. Even if the amplitude is small, the vibration frequency is high, so the vibration acceleration is large, and raw material particles cannot adhere to the screen. In other words, it has the characteristic of not causing screen clogging.

Each particle of the raw material, reflecting the above movement, forms a layer along the inner surface of the cylindrical screen, rotates at high speed and moves toward the center line, and the coarse particles from which the fine particles are separated are transferred to the cylindrical screen. is discharged from the end of the machine.

As mentioned above, each part of the cylindrical screen requires high-frequency micro-vibration to prevent clogging.
JP-A-56-105779 discloses that the cylindrical screen has a double wire mesh structure and prevents clogging by air blowing from an air nozzle that rotates with the rotor shaft. , cannot be used because the high-frequency micro-vibrations used to prevent clogging cause fatigue and breakage in a short period of time.

In recent years, woven nets made of synthetic resin fibers have appeared in which the vertical and horizontal lines are woven using monofilament yarns such as Tetoron and nylon, and then heated to fuse the overlapping parts of the vertical and horizontal lines. did.

Those with an opening of 0.5 mm or more have thick vertical and horizontal lines and relatively high bending rigidity.

However, if the eye opening is small, such as 0.1 mm or 0.05 mm, the vertical and horizontal lines will be less than the eye opening, making it extremely thin and weak.

Therefore, the rigidity of a cylindrical screen made of synthetic resin fiber woven net with an opening of 0.1 mm or less is extremely small, so the weight of the raw material swirling at high speed in layers along the inner surface of the cylindrical screen is extremely low. When it exceeds a certain limit, it becomes unstable, and the central part of the cylindrical screen generates high-speed whirling motion around the rotating shaft, and the inner surface of the cylindrical screen in this part comes into contact with the tip of the stirring blade. easily damaged.

Such a thin and weak screen is likely to break if a large tension is applied to it, so it is not possible to reduce the whirling motion by applying a large tension in the direction of the center line of the cylindrical screen.

Therefore, in order to solve these problems, it is considered that the cylindrical screen has a double synthetic resin fiber woven network structure.

However, this dual synthetic resin fiber woven network structure has the following drawbacks.

(1) A cylindrical screen with this structure usually has both edges fitted into the cylindrical part of the inner wall of the case, and its outer circumferential surface is tightened and fixed with a band. (referred to as a metal ring) and the double synthetic resin fiber woven net are fixed through the frictional force caused by line contact.

However, there are large variations in the frictional force at each contact point, so when the classifier is operated with the net under a predetermined tension, there will be a difference in the tension between the inner and outer nets, and the load on the raw material will also increase. is applied to the net, the difference in the tension of the net becomes increasingly large. The surface of the wires that make up this synthetic resin fiber woven net is extremely smooth to prevent powder from adhering to it and clogging, so the contact surfaces between the inner and outer cylindrical screens are slippery. If the net slips, it will come off the metal ring, resulting in a so-called tripping accident.

(2) Vertical or horizontal lines of the mesh that touch the metal ring shall be
Each line is independent, and especially when tension is applied in the longitudinal direction of the net, adjacent vertical lines are only connected by intersecting horizontal lines, so each line is almost independent. The state is similar to that of .

Therefore, due to the difference in wire diameter and number, there is a large variation in the frictional force between the metal ring and the wire in the circumferential direction, and where the frictional force is small, the wire bends significantly. This deflection is larger as the wire diameter is larger and the mesh opening is larger, so that the reinforcing mesh with the larger wire diameter cannot fulfill its reinforcing role.

(3) Since the meshes of the inner and outer cylinders are separate and independent, it takes time and effort to insert the inner mesh into the outer mesh, align both ends of the mesh to the same length, and fix it to the metal ring. In particular, careful attention is required to match the axial lengths of the inner and outer meshes, which requires the most effort.

The purpose of this invention is to prevent the occurrence of such whirling phenomenon, to create a stirring type that can classify 0.1 mm or 0.05 mm, and has a large sieving capacity per unit area of the cylindrical screen. The present invention aims to provide a double cylindrical screen classifier.

Another purpose is to make it easy to attach and detach the screen to the classifier and adjust the tension of the screen.

Yet another purpose is to prevent the screen from slipping out of the cylinder of the mounting bracket during operation.

In the present invention, the first cylindrical screen is made of a synthetic resin fiber woven mesh with a small opening, for example, 0.1 or 0.05 mm, which is suitable for the purpose of sieving, and a cylindrical screen with a large opening, for example, 2 to 0.5 mm. A second cylindrical screen is made of a synthetic resin fiber woven net with a mesh opening such that its inner surface is in contact with the outer surface of the first cylinder, the first cylindrical screen is placed inside the second cylindrical screen, and the inside of the end portion is A double cylindrical screen is made by applying tape that touches the periphery and the outer periphery and sewing it together with a sewing machine to make it a reinforced double cylindrical screen.The left and right ends of this double cylindrical screen are
Fit the mounting brackets consisting of a cylinder and a flange onto the outer surface of the cylinder, put a band around the outer periphery, tighten and connect them, and align one flange and the other flange of the mounting brackets to the center line of the double cylindrical screen. They are connected by several parallel adjusting rods, and the adjusting rods apply sufficient tension to the vertical line in the direction of the center line of the cylindrical screen, and the cylinder of one of the mounting brackets is fitted into the cylindrical portion of the inner wall of the casing. , screw the flange of the other mounting bracket onto the casing, and
The above object is achieved by forming an opening in the casing through which the cylindrical screen can be taken in and taken out.

The present invention is as described above, and since the second cylindrical screen has large openings and thick vertical and horizontal lines, it is possible to apply a large tension to the vertical lines, so each part can receive high frequency signals. There is a slight tremor, but
Deflection under radial loads is extremely small.

In addition, even if the raw material layer swirling at high speed along the inner surface of the double cylindrical screen becomes thick, the central part of the double cylindrical screen makes a large whirling movement about the center and comes into contact with the tip of the stirring blade. It will be completely prevented from being damaged.

Furthermore, since both ends of the double cylindrical screen are reinforced with tape and sewn together as described above, most of the load in the direction of increasing the distance between the mounting brackets at both ends is due to the rigidity. It is supported by a large second cylindrical screen, and a portion of it is transmitted to the first cylindrical screen, causing the first cylindrical screen to also become a little tense.

For this reason, the screen does not sag to a large extent and get caught on the tip of the stirring blade and be damaged.

Embodiments of the invention will now be described with reference to the accompanying drawings.

On one side of the casing 1, there is a door 2 for opening and closing the entrance/exit 2a of the double cylindrical screen 11, and on the other side, a horizontal cylinder 4 with a raw material inlet 3 is attached. The inside of the casing 1 is divided into two rooms by a partition wall 5, and the openings at the bottom of each room serve as a fine powder outlet 6 and a coarse powder outlet 7.

The end portions 8a of the first cylindrical screen 8 made of a mesh made of very small synthetic resin fibers and the second cylindrical screen 9 made of a mesh woven from relatively coarse and thick synthetic resin fibers are , are surrounded and reinforced with tapes 10a and 10b, respectively, as shown in FIGS. 1 and 3, and then sewn together to form an integral body.

These tapes 10a, 10b have an outer peripheral surface 10n
is in surface contact with the bands 12a, 12b, and its inner circumferential surface 10m is in surface contact with the outer circumferential surfaces of the cylinders 13e, 14e of the mounting fittings, so this tape is referred to as a surface contact tape.

The ends of this integrated double cylindrical screen 11 are attached to mounting brackets 1 with bands 12a and 12b, respectively.
It is strongly fastened to the outer surfaces of the cylinders 13e and 14e of No. 3 and 14.

At this time, the outer peripheral surface 10 of the tapes 10a, 10b
n is in surface contact with bands 12a and 12b, and
The inner peripheral surface 10m is the cylinder 13e, 1 of the mounting bracket.
Since it makes surface contact with the outer circumferential surface of the screen 4e, the adhesion on each contact surface is good, and the frictional force is also uniform over the entire contact surface, so accidents of the screen slipping off during operation will not occur.

Flange 13a of mounting bracket 13 and mounting bracket 14
The flange 14a is the double cylindrical screen 11.
They are connected by several adjustment rods 15a, 15b, and 15c parallel to each other, and a load is applied to the double cylindrical screen 11 in the direction of the center line by adjusting the position of a nut 14b at each end.

Adjust the positions of these nuts 13b and 14b,
The tension state of the screen is adjusted to the optimum value, taking into consideration the raw material to be handled and the characteristics of the screen.

Mounting brackets 13, 14, bands 12a, 12b,
The double cylindrical screen 11, which is tensioned by the adjusting rods 15a, 15b, and 15c, is inserted into the casing 1 through the door 2a after opening the door 2.
The mounting bracket 13 is fixed to the partition wall 5 with bolts 5a, and the mounting bracket 14 is fitted into a cylindrical portion 16 provided on the side wall of the casing 1.

A rotating shaft 19 is provided inside the casing 1, and this rotating shaft 19 is connected to the double cylindrical screen 11.
and the bearing box 1 on the common center line C of the horizontal cylinder 4.
It is rotatably supported by bearings inside 7 and 18. A pulley 20 is located at one end of the rotating shaft 19, a screw 21 is located inside the horizontal cylinder 4, and a stirring device is located inside the double cylindrical screen 11 and is inclined with respect to the center line C. A disk 23 is attached to the vanes 22a, 22b, 22c, 22d and the mounting bracket 13 at positions inside thereof.

A rotating shaft 19 is rotated at high speed in the direction of the arrow in FIG. 1 by a belt placed around a pulley 20.

The powder raw material supplied from the raw material inlet 3 is supplied to the inner surface of the double cylindrical screen 11 by the screw 21, stirred by stirring blades 22a, 22b, and 22d, and hits the double cylindrical screen 11.
While generating high-frequency micro-vibrations, fine powder smaller than the opening of the inner cylinder 8 of the double cylindrical screen 11 is discharged outside the machine from the fine powder outlet 6 through this opening, and also passes through this opening. The coarse powder that cannot be mixed is sent by the stirring blades 22a, 22b, 22c, and 22d, and finally passes through the gap between the mounting bracket 13 and the outer periphery of the disc 23, and is discharged from the coarse powder outlet 7 to the outside of the machine. Ru.

The double cylindrical screen 11 has a second cylindrical screen 9 which is woven with thick lines with large openings and has sufficient tension applied to the line in the direction of the center line. The cylindrical screen 11 swings widely and the stirring blades 22a, 22
b, 22c, and 22d from contacting and being damaged.

When the double cylindrical screen 11 is long and narrow, the raw material supplied by the screw 21 will fly off and pass through the center of the double cylindrical screen 11 before receiving sufficient stirring action on the inner surface of the double cylindrical screen 11. Since it will not pop out, the disc 23 can be omitted.

Instead of the screw 21, an inclined raw material supply pipe may be provided to supply the raw material directly into the double cylindrical screen 11.

The embodiments of this invention are not limited to the above; for example, the first and second cylindrical screens may be seamless cylinders woven with horizontal lines spirally woven, or they may be seamless cylinders woven with vertical lines and horizontal lines woven flatly. You can also make a cylinder by cutting something, rolling it into a cylinder, applying tape to the overlapped part, and sewing it together.

In addition, if the raw material to be sieved contains coarse particles, combine the first cylindrical screen with small openings on the outside and the second cylindrical screen with large openings and high rigidity on the inside. It is also possible to support the load caused by the particles with a second cylindrical screen.

The double cylindrical screen classifier according to this invention is
It has the following effects.

(1) It is possible to prevent the occurrence of whirling phenomenon, and
The sieving ability per unit area of the screen can be improved.

(2) Since the wire diameters of the synthetic fiber woven nets of the inner and outer cylinders that make up the double cylindrical screen are different, the natural frequencies of each net are different.

Therefore, since different vibrations are generated in both the screens, clogging of the screens can be prevented.

(3) Since tape was applied to the inner and outer surfaces of the ends of the double cylindrical screen and sewn together to form a single piece, most of the load that increases the distance between the mounting brackets at both ends is transferred to the cylinder with greater rigidity. It is supported by a screen, and part of it is transmitted to the other cylindrical screen, which also bears some tension.

Therefore, unlike the conventional example, the stirrer does not sag to a large extent and get caught on the tip of the stirring blade, so it is possible to prevent damage from occurring.

(4) The end of the double cylindrical screen was fitted onto the outer surface of the cylinder of the mounting bracket, and a band was placed on the outer circumferential surface to tighten it, so the end of the synthetic resin fiber woven screen was connected to the mounting bracket via the tape. Make surface contact with the band.

Therefore, the frictional force generated on their contact surfaces becomes uniform over the entire surface, so there is no difference in the tension between the inner cylinder and the outer cylinder screen.

Therefore, unlike the conventional example, a slip-off accident does not occur.

(5) Fit the left and right ends of the cylindrical screen onto the outer surface of the cylinder, put a band around the outer periphery of the screen, tighten and connect them, and connect them with a plurality of adjustment rods parallel to the center line of the screen. Since a load was applied to the screen in the direction of the center line, the double cylindrical screen was firmly fixed to the mounting bracket and became one piece.

Therefore, the screen can be easily installed in a classifier simply by fitting one fitting into the cylindrical portion of the inner wall of the casing and screwing the other fitting onto the casing; The screen can be easily removed from the classifier by simply releasing the screen.

(6) The tension of the double cylindrical screen can be easily adjusted by adjusting the adjustment rod.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of an embodiment of the present invention;
The figure is a cross-sectional view taken along the line A--A in FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line -- in FIG. 3. DESCRIPTION OF SYMBOLS 1... Casing, 2a... Inlet/outlet, 3... Raw material inlet, 8... First cylindrical screen, 9... Second cylindrical screen, 10a, 10b... Tape, 1
1... Double cylindrical screen, 13, 14... Mounting bracket, 15a, 15c... Adjusting rod, 19... Rotating shaft, 22a, 22d... Stirring blade.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Fit the inner sides of both ends of a cylindrical screen containing a stirring blade into the outside of the cylinder of the mounting bracket, and connect them by hooking a band on the outer side and tightening them; The tension state is adjusted by connecting the flanges of the mounting brackets with an adjustment rod, the cylinder of one of the mounting brackets is fitted into the cylindrical portion of the inner wall of the casing, and the flange of the other mounting bracket is screwed into the casing. In the agitation type cylindrical screen classifier, the cylindrical screen is composed of a cylindrical screen made of a synthetic resin fiber woven net with a small opening suitable for the purpose of sieving, and a cylindrical screen made of a synthetic resin fiber woven mesh with a much larger opening. A double cylinder is made by fitting a cylindrical screen made of synthetic resin fiber woven net with the same diameter as the wire so that they are in close contact with each other, applying surface contact tape to the inner and outer surfaces of the ends, and sewing them together. An agitation type double cylindrical screen classifier characterized by a screen. (2) A cylindrical screen made of synthetic resin fiber woven net with a small opening is fitted inside a cylindrical screen made of synthetic resin fiber woven net with a much larger opening. An agitation type double cylindrical screen classifier according to claim 1 of the registered utility model claim. (3) A cylindrical screen made of synthetic resin fiber woven net with a small opening is fitted onto the outside of a cylindrical screen made of synthetic resin fiber woven net with a much larger opening. An agitation type double cylindrical screen classifier according to claim 1 of the registered utility model claim.