JPH08257502A - Sieve device - Google Patents

Abstract

PURPOSE: To provide a sieve device which can separate rubber or resin without making them lumpy, and is equipped with a function to discharge a residual substance. CONSTITUTION: This sieve device comprises a sieve face 8 comprising a net, a rotary shaft 2 stood almost in the center of the sieve face 8, a gradient blade 5 installed radially on the rotary shaft 2, and an outer frame 7. The blade 7 is arranged with a microclearance which is upto four times the opening size of the sieve face between the blade face 7 and the sieve face 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sieving device mainly used for powder which is made of vulcanized rubber or plastic and which is lightweight and easily agglomerated.

[0002]

2. Description of the Related Art Waste materials of vulcanized rubber and cross-linked resin are treated as industrial wastes, and the amount of them is increasing year by year. There is a question about resource depletion. Reuse of waste is considered in order to reduce the amount of waste.

Usually, when reusing rubber or resin,
A method is used in which waste materials are mixed into products that use the same kind of rubber or resin. However, it is inevitable that foreign matter will be mixed even if it enters the same kind of material,
The physical properties of the product will deteriorate. In order to suppress the deterioration of physical properties as much as possible, it is important that the waste material is crushed into a powder of uniform size and mixed in a uniformly dispersed form in the material. It is important to be close to.

However, since the products using rubber and resin on the market are not only rubber and resin but also composite materials with organic and inorganic fibers and metals, simply crushing them results in products other than rubber and resin. It becomes a powder consisting of a mixture with foreign substances and cannot be mixed as it is. Even if pulverized, fibers and metals are unlikely to be powder of the same size as rubber or resin, and there is a problem in that the sizes of the powder are also uneven.

Therefore, it is necessary to remove foreign substances other than rubber and resin and make the sizes of the powders uniform. There are various methods as the means, and among them, a method of easily removing is to use a sieve. The vibrating method is the most typical method for the sieving apparatus, and it is suitable for the one having a large specific gravity, but the one having a small apparent specific gravity has a problem that the efficiency is poor because the falling weight is small.

Further, the so-called airflow cyclone system is a separation system utilizing a difference in specific gravity utilizing air pressure.
As another method, Japanese Patent Application Laid-Open No. 52-136462 discloses a method of forcibly passing the screen surface by sweeping the screen surface with a closed rotary brush.

[0007]

Since the vibrating type sieving device puts the separated substance into the sifter to give vibration, in the case of powder of rubber or resin, the surface is easily softened by heat such as friction. However, there is a drawback that the powder solidifies and agglomerates because it becomes sticky.

Further, even in the airflow cyclone system, a mixture of rubber or resin and fibers does not show a large difference in specific gravity, and there is a drawback that the yield is deteriorated, and a device having a high degree of airtightness to prevent scattering of powder. Therefore, there is a problem that a large-scale device is required. In the method of sweeping the screen surface with a rotating brush (Japanese Patent Laid-Open No. 52-136462), the brush and the screen surface are in contact with each other, and the problem that the net or the brush forming the screen surface is consumed and the problem that static electricity occurs was there.

Further, in the sieving device, the residue remaining on the sieving surface must be removed periodically, and when the product is manufactured, the powder continuously produced by polishing or the like is put into the sieving as it is, and foreign matter is introduced. When it is desired to separate from the product, the amount of residue must be monitored at all times, and it was not suitable for continuous operation day and night. Therefore, an object of the present invention is to provide a sieving device which is capable of separating rubber and resin without agglomeration and having a function of discharging a residue.

[0010]

In order to achieve such an object, the present invention is a sieve device for sieving a powder which is mainly composed of vulcanized rubber or resin and which is easy to agglomerate. Surface, a rotating shaft provided substantially in the center of the screen surface, a blade radially attached with an inclination to the rotating shaft, and an outer frame, the blade being between the screen surface and the blade of the screen surface. It is characterized in that it is arranged with a minute gap of up to 4 times the size of the opening. In addition, the outer frame has a residue discharge hole, an inner frame attached to the blades, and a discharge blade attached to the outside of the inner frame, and a predetermined gap is provided between the inner frame and the screen surface. This is advantageous because foreign substances other than rubber and resin and substances that have different sizes and have not passed through the sieve can be discharged.

[0011]

According to the present invention, the powder made of rubber or resin on the screen surface is biased toward the screen surface by rotating the inclined blades. It can be passed through a sieve, and foreign substances such as rubber and resin powder can be easily separated.Also, the presence of the inner frame keeps the agglomerated powder in the inner frame until it is crushed. You can call. In addition, since the residue discharge hole is provided in the outer frame of the sieving device, foreign matter moves to the outer peripheral side as the rotary shaft rotates, and finally, the discharge blade can automatically discharge the residue from the residue discharge hole to continuously operate. It is also possible to correspond to.

[0012]

1 is a perspective view of a sieving apparatus of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG.
FIG. 3 is a side view showing that the powder is supplied from above to the sieving apparatus of the present invention. In the sieving apparatus 1, four strips 3 are fixed to a rotating shaft 2 supported by upper and lower bearings, and a cylindrical inner frame 4 is fixed to the tip of the strip 3 to form a rotation chamber. . The blades 5 that are inclined forward with respect to the rotation direction are detachably attached to the four strips 3, respectively. Further, a return plate 6 fixed to the inner frame 4 is provided.

On the bottom of the cylindrical outer frame 7 is attached a sieve surface 8 made of wire mesh or the like, and a minute gap is maintained between the blade 5 and the sieve surface 8, and the inner frame 4 and the sieve surface 8 are provided. During that time, a predetermined interval is maintained so that the residue passes through. Spacers may be provided at important points in order to maintain a uniform gap throughout the inner frame 4 and the blades 5. Further, discharge blades 9 are attached to the outer side of the inner frame 4 at four locations. On the other hand, at least one residue discharge hole 10 is provided in the outer frame 7, and the residue discharged to the outside between the inner frame 4 and the sieve surface 8 is discharged by the discharge blade 9 through the residue discharge hole 10. It is supposed to do.

Between the blades 5 and the screen surface 8 there is a minute gap of up to 4 times the opening of the screen surface 8, and the gap is sufficiently narrow so that agglomerated powder can be crushed. Since there is no difference in the presence of the gap, there is no friction between the screen surface 8 and the blade 5, and no abrasion or static electricity is generated. Return plate 6
In order to prevent the agglomerated powder from staying in the vicinity of the inner wall of the inner frame 4 and being broken by the blades 5 due to the centrifugal force, when the rotary shaft rotates in the direction of the single arrow in FIG.
It is provided so as to return in the direction of the double arrow and is inclined with respect to the radial direction. In addition, a space having a space equal to or larger than the space between the inner frame 4 and the screen surface 8 is provided so as not to hinder the discharge of residues such as fiber waste.

The sieving surface 8 is made of a metal net or the like. When using rubber and resin waste materials mixed with other molded products, it is necessary to make powder with a particle size of 4 mm or less, so the opening is 5
-16 mesh is used. If the opening size is less than 5 mesh, the opening size is too large to pass over 4 mm, so that the foreign matter cannot be separated. Also,
If it exceeds 16 meshes, the openings will be too fine and clogging will occur. The blade 5 is made of metal, resin, or the like, and is attached to the rotating shaft 2 by tilting forward with respect to the rotation direction, and the inclination angle thereof is set between 20 ° and 60 °.

The rotary shaft 2 is a direct motor (not shown).
Is attached and rotated, or rotation is transmitted from an external motor (not shown) using a belt 13 via a drive pulley 12. In the drawing, it is configured to operate by rotating to the right. The rotation speed of the rotary shaft 2 is 50 to 100.
Set to about rpm. If it exceeds 100 rpm, the sieve surface is likely to be clogged, which is not preferable, but even if it is slower than 50 rpm, the degree of clogging does not change. In order to prevent the clogging of the screen surface, it is preferable to perform a reverse rotation operation for several seconds to several tens seconds every 2 minutes to 10 minutes.

The sieving apparatus 1 of the present invention, which has the above-described structure, can hold the agglomerated powder by the inner frame 4 and crush it by using the blades 5, so that efficient separation is possible. Further, a residue such as a foreign matter that does not pass through the sieve can be sent out of the inner frame 4 and discharged from the residue discharge hole 10 by using the discharge blade 9. By adopting such a configuration, it is possible to save the labor of removing the residue when continuously operating in the state where the powder is supplied from the upper portion of the sieve device 1 as shown in FIG.

Next, an experiment in which the forward inclination angle of the blades 5 is changed and the amount of powder passing through the sieve is compared in the sieve device 1 of the present invention will be described. The mesh of the sieve was made of metal and 10 mesh was used, the number of revolutions was kept constant at 85 rpm, and the powder applied to the sieve was polishing dust generated during the production of the vulcanized rubber belt. In addition to rubber, the powder contains fiber scraps and thread-shaped tape pieces. At the angle of each blade 5, the rotary shaft 2 is
The amount of powder that passed through the sieve when rotated 0 ° was measured. The results are shown in Table 1.

[0019]

[Table 1]

As described above, in the sieving apparatus 1 of the present invention, the larger the angle of the blades 5 is, the larger the amount of powder passing through the sieve tends to be. However, if the angle is less than 20 °, the passing amount is small. If it exceeds 60 °, the powder supplied from the upper portion will be deposited on the back surface of the blade 5 and it will hinder the operation. Therefore, it is preferable to use it within the range of 20 ° to 60 °.

Further, a comparison was made when powders such as rubber and resin handled in the present invention, which are easily agglomerated, were sifted by the sieving apparatus of the present invention and a vibration type sieving apparatus. Both openings on the sieve surface are 1
0 mesh, 120kg powder 2kg / 1min
Was continuously supplied at a pace of, and the amount of passage when operating for 1 hour was compared. The results are shown in Table 2.

[0022]

[Table 2]

From Table 2, in the case of the sieving apparatus of another system and the sieving apparatus of the present invention, when sieving powders such as rubber and resin which are easily agglomerated, how to prevent the powders from agglomerating and agglomeration It can be seen that there is a marked difference in the function of breaking down the powder that has been formed.

[0024]

As described above, in the sieving apparatus of the present invention, when a powder such as rubber or resin that easily agglomerates is passed through a sieve, the agglomerated powder can be passed through the sieve surface while being crushed by a blade. Also, even in the case of a large lump, it can be held in the inner frame with blades until it is almost crushed by the inner frame, and fiber debris that does not pass through the sieve surface is sent out through the gap between the inner frame and the sieve surface, Further, since it can be discharged to the outside of the outer frame by the discharge blade, it can be said that the sieve device can perform efficient sieving and can perform continuous operation.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a sieving apparatus of the present invention.

FIG. 2 is a plan view of the sieving apparatus of the present invention.

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

FIG. 4 is a side view of the sieving apparatus of the present invention in which powder is being supplied from above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sieve device 2 Rotating shaft 3 Strip plate 4 Inner frame 5 Blades 6 Return plate 7 Outer frame 8 Sieve surface 9 Discharge blade 10 Residue discharge hole

Claims (4)

[Claims] 1. A sieving device for sieving a powder which is mainly composed of vulcanized rubber or resin and which is easy to agglomerate. It is composed of at least one blade attached to the rotating shaft and an outer frame, and the blade is arranged with a minute gap up to 4 times the size of the opening of the sieve surface between the blade and the front surface in the direction of rotation. A sieving device characterized by being installed by tilting. 2. The sieve device according to claim 1, wherein the residue discharge hole is provided in the outer frame. 3. The sieving apparatus according to claim 2, further comprising an inner frame attached to the blade, and a discharge blade attached to the outer side of the inner frame. 4. A sieving device for sieving a powder which is mainly composed of vulcanized rubber or resin and which is easy to agglomerate. The blade includes a blade radially attached to the rotating shaft with an inclination, an inner frame attached to the blade and rotating together with the rotating shaft, a discharge blade attached outside the inner frame, and an outer frame having a residue discharge hole. Is disposed with a minute gap of up to 4 times the size of the opening of the sieve surface between the sieve surface and the sieve surface.