JP6582990B2 - Cylindrical sieving device and method for selecting powder particles using the same - Google Patents

Description

  The present invention relates to a cylindrical sieving device and a method for selecting a granular material using the same, and in particular, to reduce the amount of normal particles discharged together with the selected coarse particles and increase the collection yield of normal particles. The present invention relates to a cylindrical sieving apparatus and a method for selecting a granular material using the same.

  Resin pellets as powder particles are, for example, long resin that is compounded with a thermoplastic resin with a reinforcing agent or a colorant, and newly added value is extruded and molded from the discharge port of the die. Is cut in a direction perpendicular to the length direction. The cut granular resin is collectively referred to as “resin pellet”, and is used as a raw material for molding in various fields, for example, in the field of automobiles and electrical parts.

  The shape of the cut surface of such a resin pellet is stable because it is determined by the shape of the discharge port, but the shape (size) in the length direction may result in a poorly shaped pellet depending on the material characteristics and cutting conditions. There is.

  Since a poorly shaped pellet induces unstable feed into the molding machine and has a great influence on the molding process, it is necessary to suppress variations in pellet shape within a certain range. In order to suppress the variation and obtain pellets having a size within a certain range, it is effective to select normal grains and other pellets with respect to the size, in particular, the length of the pellet.

  As a method for selecting the generated poorly shaped pellets, there is a method of sieving the input pellets according to the length using a vibration sieve device. As the vibration sieving device, for example, a punching metal (perforated plate) having a predetermined opening for sieving the input material, and a vibration means for oscillating the punching metal, the material to be sieved is punched metal. Vibrating sieve devices that are put on top are known (for example, Patent Documents 1 to 7).

  For example, a cylindrical sieve device as shown in FIG. 1 is known as this type of vibrating sieve device (the cylindrical sieve device shown in FIG. 1 is common to the description of the prior art and the description of the present invention. Use). In the cylindrical sieving apparatus 1 shown in FIG. 1, a punching metal having a predetermined opening in which a raw material granular material 3 introduced from a granular material inlet 2 is vibrated in a sieve frame 4 by a vibration means 5. In the upper sorting chamber 7 provided with the (perforated plate) 6, the coarse particles are sorted into other granular materials (powder particles including target normal size normal particles and powder) and selected. Coarse grains are discharged from the coarse grain outlet 8. After the coarse particles are mainly removed, the granular material 9 is dropped into the lower middle sorting chamber 10 and on the vibrating punching metal (porous plate) 11 having an opening smaller than the punching metal (porous plate) 6. The normal particles and the powder are sorted, the normal particles are discharged from the normal particle discharge port 12, and the powder 13 is dropped into the lower chamber 14 and discharged from the powder discharge port 15.

  In such a conventional cylindrical sieving apparatus, as shown in FIG. 4, for example, in the upper sorting chamber 7, the charged raw material granular material is distributed as much as possible on the punching metal 6 as much as possible. The structure which provides the baffle plate 16 which controls the flow of the raw material granular material on the punching metal 6 so that it may extend inwardly from the inner peripheral surface of the sieve frame 4 so that it can use for the selection process by (3). Is known (for example, Patent Documents 1, 2, and 5).

JP 2000-135474 A JP-A-2005-305386 JP 2012-217899 A JP 2013-252493 A Japanese Patent Laid-Open No. 03-213181 JP-A-10-309527 Japanese Patent Laid-Open No. 11-319716

  However, in the conventional cylindrical sieving apparatus as shown in FIG. 4, the raw material granular material is formed on the punching metal 6 only by providing the rectifying plate 16 that extends short inward from the inner peripheral surface of the sieving frame 4. In addition to the effect of uniform distribution being insufficient, the flow distance from the raw material granule input part to the coarse grain outlet 8 is short, so that the coarse grain outlet 8 can sort together with the selected coarse grains. Normal grains that have not been sufficiently performed are discharged. If the discharge amount of normal particles from the coarse particle discharge port 8 increases, the collection yield of normal particles in sorting by the entire sieving device is lowered, and the yield when the normal particles are collected products is deteriorated.

  Therefore, the object of the present invention is to pay attention to the problems in the conventional sieving apparatus as described above, and the amount of normal grains discharged together with coarse grains can be greatly reduced. Is to provide a cylindrical sieving apparatus capable of greatly improving the above and a method for selecting a granular material using the same.

In order to solve the above-mentioned problems, a cylindrical sieve device according to the present invention comprises a raw material granule placed in a central part of the sieve frame in a sieve frame having a circular planar shape, and coarse particles. A vibrating perforated plate that can be sorted into other granular materials is provided, and an upper sorting chamber in which a coarse particle discharge port for discharging coarse particles sorted on the porous plate is provided in the sieve frame. in cylindrical sieve device, wherein the upper sorting compartment, the one end connected to said coarse particle discharge outlet of the sieve frame circumferential direction end side position of the sieve frame, long linear than the radius of the circular sieve frame A rectifying plate extending to the center of the circular sieve frame, the rectifying plate extending so as to be inclined toward the region including the coarse grain outlet, and the rectifying plate in the upper sorting chamber. The upper sorting chamber partitioned by the current plate on the extension line of the other end of the Provided with a granular material flow passage port through which the granular material on the perforated plate can move from a region including the center of the circular sieve frame to a region including the coarse particle discharge port, and the width of the granular material flow passage port And 3% or more of the diameter of the circular sieve frame.

In such a cylindrical sieving apparatus according to the present invention, the raw material granular material is introduced into the central portion in the sieving frame of the upper sorting chamber, and the raw material granular material that has been introduced has openings of a predetermined size. By the vibration of the perforated plate (for example, punching metal), it is sorted into coarse particles that do not pass through the eyes of the perforated plate and powder particles including normal particles that pass through the eyes of the perforated plate. The selected coarse particles are discharged from the coarse particle discharge port. At this time, normal particles that have been insufficiently selected are also discharged from the coarse particle discharge port. However, in the present invention, in the upper sorting chamber, one end as described above is connected to the position of one end in the circumferential direction of the coarse frame outlet of the sieve frame, and is longer than the radius of the circular sieve frame. The straightening rectifying plate is arranged so as to be inclined toward the region including the coarse grain outlet with respect to the direction passing through the center of the circular sieve frame, and on the extension line of the other end of the rectifying plate Is provided with a granule passage opening. Therefore, the granular material on the perforated plate does not flow in a short-circuit direction from the central portion in the sieve frame of the input upper sorting chamber to the coarse particle outlet, but is guided by the current plate, that is, the current The perforated plate is guided from the region including the center of the circular sieve frame in the upper sorting chamber defined by the plate to the region including the coarse particle discharge port through the granular material channel port, and then the coarse particle discharge is performed. It flows toward the outlet and follows a path that is discharged in a form including coarse particles selected from the coarse particle outlet. In this way, the specific flow straightening plate prevents short-circuit movement of the normal particles to the coarse particle discharge port, and the traveling path (flow path) of the granular material on the porous plate becomes long. The layer thickness of the granular material on the plate is made uniform, the contact time of the granular material with the perforated plate is lengthened, the sorting efficiency between coarse particles and normal particles is increased, and the coarse particle outlet is sorted. The amount of normal grains that will flow without being drastically reduced. As a result, the amount of normal grains discharged from the coarse grain outlet along with the coarse grains is greatly reduced, and the collection yield of normal grains in this apparatus is greatly increased. In the present invention, since the width of the above-mentioned granular material flow passage opening provided on the front end side of the current plate is set to 3% or more of the diameter of the circular sieve frame, The inconvenience of causing an overflow due to the clogging of the granular material that does not completely pass through the flow passage opening of the granular material is avoided, and a significant improvement in the collection yield of normal particles as described above is reliably achieved. It is supposed to be done.

  In the cylindrical sieving apparatus according to the present invention, it is possible to adopt a form in which the coarse grain outlets are provided at a plurality of locations in the circumferential direction of the sieving frame, but one location in the circumferential direction of the sieving frame. It is preferable to adopt a form provided only by the above. By being provided only at one place, the operation and effect of the current plate as described above can be obtained more reliably.

  Further, the length of the rectifying plate needs to be longer than the radius of the circular sieve frame, and further, as the length from the connection position to the sieve frame to one end of the granular material channel port The diameter of the circular sieve frame is preferably set to 70% or more. By setting the length of the current plate in this way, the operation and effect of the current plate as described above can be obtained more reliably. However, it is a premise that the width of the granular material channel opening provided on the front end side of the current plate is set to 3% or more of the diameter of the circular sieve frame.

  Further, the current plate is disposed so as to be inclined and extend toward the region side including the coarse grain discharge port with respect to the direction passing through the center of the circular sieve frame. At this time, the current plate is connected to the sieve frame. It is preferable that it is arrange | positioned in the angle range of 5-28 degree | times with respect to the diameter direction of the sieve frame which passes along the center of a circular sieve frame. By arranging the rectifying plate within such an angle range, it is possible to secure a region where a good sorting function can be achieved by the vibrating porous plate of the powder guided on the porous plate and to be guided on the porous plate. It is possible to ensure a long contact time of the granular material with the porous plate and improve the sorting function itself by the vibrating porous plate.

  Moreover, in the cylindrical sieving apparatus according to the present invention, it is preferable that a flat plate portion having no holes different from the porous plate is provided in the central portion in the sieving frame of the upper sorting chamber. By providing such a flat plate portion, among the raw material granular material charged in the central portion in the sieving frame, the granular material having a length corresponding to a coarse particle has a longitudinal direction of the porous plate. By throwing in the posture toward the eyes, the phenomenon of passing through the eyes without being sorted by the perforated plate can be suppressed, and the reduction of the sorting efficiency in the upper sorting chamber can be suppressed.

  In addition, when the optimum value of the length of the current plate is required, the length of the current plate may be set to the optimum value, but when the type or lot of the raw material granular material to be selected is changed The optimum value of length may change. In order to cope with such a case, it is preferable that a rectifying plate length adjusting mechanism capable of adjusting the length of the rectifying plate is provided at one end side portion of the powder particle passage opening of the rectifying plate. When such a length adjusting mechanism is provided, the length of the current plate can be easily adjusted to an optimum length as necessary. The angle of the rectifying plate can be adjusted to the position of the rectifying plate connected to the sieve frame, for example, with respect to the angle of the rectifying plate connected to the sieving frame and the diameter direction of the sieving frame passing through the center of the circular sieve frame. If a straightening plate angle adjusting mechanism is provided, the angle of the straightening plate can be easily adjusted to an optimum angle as necessary.

  In addition, when the rectifying plate length adjusting mechanism also serves as a mechanism for adjusting the width of the granular material channel opening provided on the tip side of the rectifying plate, the length of the rectifying plate and the width of the granular material channel port are optimized simultaneously. It becomes possible to adjust to the value.

  In the cylindrical sieving apparatus according to the present invention, as shown in FIG. 1 described above, the granular material after the coarse particles sorted in the upper sorting chamber are removed at the lower portion of the upper sorting chamber. The granular material after the coarse particles sorted in the above-mentioned upper sorting chamber are removed can be further removed by the vibrating porous plate and the normal size within the target range and the size less than that It is possible to adopt a configuration having a middle sorting chamber capable of sorting into the powder. Furthermore, a lower chamber in which powder can be taken out can be provided at the lower part of the middle sorting chamber. The installation room can be determined as necessary.

  The type of the input raw material granular material to be selected in the cylindrical sieve device according to the present invention is not particularly limited, but the cylindrical sieve device according to the present invention is, for example, a resin pellet cut to a predetermined length ( (Including composite pellets containing components other than resin).

  The present invention also provides a method for selecting a granular material by using the cylindrical sieve device as described above to select the granular material. This method for selecting a granular material according to the present invention is also optimal for use in, for example, selecting resin pellets cut into a predetermined length (including composite material pellets containing components other than resin).

  According to the cylindrical sieving apparatus and the granular material sorting method using the cylindrical sieving apparatus according to the present invention, the specific flow straightening plate is provided in the specific arrangement form in the upper sorting chamber, and the raw material granular material charged on the vibrating perforated plate Since the width of the granular material flow passage opening for guiding the granular material to flow between the regions on both sides partitioned by the rectifying plate is set to a specific width or more, the coarse selected The amount of normal grains discharged from the coarse grain outlet along with the grains can be greatly reduced, and the collection yield of normal grains in this apparatus can be greatly increased.

It is a schematic longitudinal cross-sectional view which shows the whole structure common with the prior art of the cylindrical sieve apparatus which concerns on one embodiment of this invention. FIG. 2 is a perspective view of an upper sorting chamber showing a characteristic part of the present invention in the cylindrical sieve device of FIG. 1. FIG. 3 is a schematic plan view of the upper sorting chamber of FIG. 2 showing an example of the flow state of the granular material in the present invention. It is a perspective view of the upper sorting room which shows an example of a prior art.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cylindrical sieving device 1 according to an embodiment of the present invention, showing an overall configuration common to the prior art as described above. In this embodiment, as shown in FIG. 2, an upper sorting chamber 22 is formed in a sieve frame 21 having a circular planar shape, and a predetermined size different from that of the porous plate 23 is formed in the central portion of the upper sorting chamber 22. The flat plate part 25 without the holes 24 is provided. Of the raw material granular material charged into the central portion of the sieve frame 21 by the flat plate portion 25, the granular material having a length corresponding to the coarse particle is arranged in the longitudinal direction of the eyes (holes) 24 of the porous plate 23. The phenomenon of passing through the eyes (holes) 24 as it is by being thrown in a posture directed in the direction is suppressed.

  In the upper sorting chamber 22, the raw material granular material 3 introduced from the granular material inlet 2 as shown in FIG. 1 is added by the vibration means 5 (FIG. 1) in the sieve frame 21 (FIG. 2). By virtue of the vibrating perforated plate 23 (FIG. 2) having the holes 24 of a predetermined size to be shaken, coarse particles are sorted into other granular materials (a granular material including normal particles of normal size and powder targeted). Is done. The selected coarse particles are discharged from the coarse particle discharge port 26 (FIG. 2), and the granular material 9 (FIG. 1) after the coarse particles are removed is, as described above, the lower middle sorting chamber 10 (FIG. 1). ) And is sorted into normal grains and powder in the middle sorting chamber 10. The normal particles sorted in the middle sorting chamber 10 are discharged from the normal particle discharge port 12 (FIG. 1), the powder 13 (FIG. 1) is dropped into the lower chamber 14 (FIG. 1), and the powder discharge port 15 (FIG. 1). ) Is discharged.

  In this embodiment, as shown in FIG. 2, the angle can be adjusted in the upper sorting chamber 22 so that one end of the sieve frame 21 is positioned at one end side in the circumferential direction of the sieve frame 21 of the coarse grain outlet 26. A rectifying plate 28 is provided which is connected via the connecting portion 27 and extends longer than the radius of the circular sieve frame 21. The material of the current plate 28 is not particularly limited, but it is desirable to use a material that can withstand friction with the powder particles. The current plate 28 extends so as to incline toward the region A (shown in FIG. 3) including the coarse grain outlet 26 with respect to the direction of the diameter 29 (shown in FIG. 3) passing through the center C of the circular sieve frame 21. Has been placed. On the extension line of the other end of the flow straightening plate 28 in the upper sorting chamber 22, a region B (shown in FIG. 3) including the center C of the circular sieve frame in the upper sorting chamber defined by the flow straightening plate 28. To the region A including the coarse particle discharge port 26 is provided with a granular material channel port 30 through which the granular material on the porous plate 23 can move. The width W (illustrated in FIG. 3) of the granular material channel port 30 is set to 3% or more of the diameter of the circular sieve frame 21. In the present embodiment, a slide mechanism capable of adjusting the position of the tip portion is provided on the tip side of the powder passage opening 30 of the rectifying plate 28, and this slide mechanism adjusts the length of the rectifying plate 28. A possible rectifying plate length adjusting mechanism 31 is configured. Further, in this embodiment, a part of the rectifying plate length adjusting mechanism 31 is extended to the forming part of the powder channel opening 30, and the rectifying plate length adjusting mechanism 31 is adjusted along the extending part 32. By doing so, the width | variety of the granular material flow-path opening 30 can also be adjusted now. The anti-rectifying plate 28 side portion of the granular material channel port 30, that is, the anti-rectifying plate 28 side portion of the extension portion 32 is connected to the sieve frame 21 via the connection portion 33, and through the connection, Finally, the arrangement of the rectifying plate 28 and the position of the granular material flow passage port 30 are determined.

  The length of the current plate 28 arranged as described above may be longer than the radius of the circular sieve frame 21 as described above, but is desirably set to 70% or more of the diameter of the circular sieve frame 21. The Further, as shown in FIG. 3, regarding the inclination arrangement of the rectifying plate 28, as an angle θ with respect to the diameter 29 direction of the sieving frame 21 passing through the connection position 27 to the sieving frame 21 and the center C of the circular sieving frame 21, It is preferable to arrange within an angle range of 5 to 28 degrees. Furthermore, as distance L between the outer periphery of the flat plate part 25 provided in the center part in the sieving frame 21 and the rectifying plate 28, for example, within a range of about −9% to 15% with respect to the diameter of the sieving frame 21. (A minus sign indicates a state in which the rectifying plate 28 is disposed on the flat plate portion 25).

Hereinafter, the present invention will be described more specifically with reference to examples.
Cylindrical vibratory sieve device having a structure as shown in FIG. 1 is selected by compounding a reinforcing agent, an additive, and a colorant into a PPS (polyphenylene sulfide) resin and cutting. Example using Sato-type sieve machine, upper punching metal φ5mm × P (pitch) 8mm (center flat plate φ160mm), lower mesh φ0.71mm × P1.41mm × 12mesh) 1 to 6 and Comparative Examples 2 to 6 are provided with a rectifying plate (material: SUS304) and a granular material passage port as shown in FIGS. 2 and 3, and in Comparative Example 1 as shown in FIG. A technical baffle was provided and tested as follows.

  Hereinafter, the present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to these examples. In the following examples and comparative examples, [%] is based on mass unless otherwise specified.

  In the following examples and comparative examples, a raw material pellet as a granular material was supplied at a rate of about 8400 g / min using a cylindrical sieve device having a sieve frame diameter of 615 mm, and a sorting process was performed. Moreover, the evaluation criteria of the granular material discharged from the discharge port is that when any one of coarse particles = long diameter, short diameter, length is 5.1 mm or more, normal particles = long diameter, short diameter, Pellets whose lengths were all 5.0 mm or less were divided and evaluated with tweezers, and the remaining ones were used as powder.

  First, after 30 seconds from the start of operation of the cylindrical vibration sieve device, supply of PPS resin onto the sieve punching metal was started. A fixed amount of PPS resin was continuously supplied onto the sieve punching metal from the powder particle inlet, and coarse particles, normal particles, and powder were selected for a certain time. The selection object that did not pass through the upper sieve mesh (large) was collected from the coarse grain outlet. The selection object that passed through the upper screen (large) and did not pass through the lower screen (small) was collected from the normal grain outlet. The selection objects that passed through the upper screen (large) and also passed through the lower screen (small) were collected from the powder outlet.

[Example 1]
As an installation condition of the current plate, the angle is 22 ° from the current plate attachment position and the line passing through the center of the screen, and the length is 90.2% (555 mm) with respect to the diameter of the screen frame of the cylindrical screen device. The flow path width of the resin pellet (width of the granular material flow path opening) is 3.3% (20 mm) with respect to the diameter of the sieve frame of the cylindrical sieve device. It was found that 6.5% (40 mm) is suitable for the distance to the diameter of the sieve frame. The PPS resin is introduced from the powder and material inlet, starts moving by vibration on the punching metal, and moves while contacting the punching metal and the current plate. By providing the current plate at this time, the contact time of the powdered fluid with the punching metal is dramatically increased compared to Comparative Example 1 below, and the amount of processing in the vicinity of the center of the punching metal is increased, resulting in coarse grains. The movement to the discharge port and the discharge were significantly reduced. Furthermore, the extension of the PPS resin travel path averaged the layer thickness of the punching metal, and the absolute amount of coarse grain discharge at the normal grain outlet was also reduced. In the selection at the lower mesh part, the absolute amount of powder discharged to the normal grain outlet decreased with the improvement of the throughput near the center of the upper punching metal. The throughput of the sieve does not decrease even when operated for a long time. The results are shown in Table 1.

[Comparative Example 1]
Sorting was carried out using a cylindrical vibration sieve device provided with two rectifying plates according to the prior art shown in FIG. 4 without the rectifying plate according to the present invention. That is, since the current plate according to the present invention is not provided, the cylindrical vibration sieve device is configured not to apply the present invention. As a result, the time for the PPS resin to contact the punching metal in the upper sorting chamber was short, and there was a tendency for normal grains to go straight to the coarse grain outlet. The amount of normal products discharged from the coarse particle outlet increased by 89.5% when compared with Example 1, and it was found that the sorting accuracy was insufficient.

  Moreover, the amount of coarse particles mixed at the normal particle outlet increased by 21.4% when compared with Example 1, and it was found that the sorting accuracy was insufficient.

  Further, the amount of powder mixed at the normal grain outlet increased by 29.4% when compared with Example 1, and it was found that the sorting accuracy was insufficient. The results are shown in Table 1.

[Example 2, Comparative Example 2]
Compared to Example 1, the installation angle of the current plate is 22 ° to 4.5 °, and the length is 90.2% (555 mm) to 97.8% (601 mm) with respect to the diameter of the sieve frame of the cylindrical sieve device. The distance between the outer periphery of the flat plate portion without punch holes in the central portion of the sieve frame and the current plate is 6.5% (40 mm) to -8.1% (-50 mm) with respect to the diameter of the sieve frame, Was selected in the same manner as in Example 1 at three levels of 1.6% (10 mm), 3.3% (20 mm), and 7.3% (45 mm) with respect to the diameter of the sieve frame. As a result, when the width of the granular material channel opening was 1.6% with respect to the diameter of the sieve frame, the width of the granular material flow channel port was too narrow, so that the processing could not be completed and clogging occurred, causing overflow. Therefore, this level was set as Comparative Example 2. When the width of the granular material channel opening is 3.3% (20 mm) and 7.3% (45 mm) with respect to the diameter of the sieve frame, it is coarse compared with Comparative Example 1 although not as much as Example 1. The amount of normal grains discharged from the grain outlet was significantly reduced. The results are shown in Table 1.

[Example 3, Comparative Example 3]
With respect to Example 1, the installation angle of the current plate is 22 ° to 11 °, and the length is 90.2% (555 mm) to 96.7% (595 mm) with respect to the diameter of the sieve frame of the cylindrical vibration sieve device. The distance between the outer periphery of the flat plate part without punch holes at the center of the sieve frame and the current plate is 6.5% (40 mm) to 0% (0 mm) with respect to the diameter of the sieve frame, and the width of the powder channel opening is set to the sieve frame. Selection in the same manner as in Example 1 at four levels of 1.6% (10 mm), 3.3% (20 mm), 7.3% (45 mm), and 11.4% (70 mm) went. As a result, when the width of the granular material flow passage opening was 1.6% of the diameter of the sieve frame, the width of the granular flow passage opening was too narrow, so that the processing could not be completed and clogging occurred, causing overflow. Therefore, this level was set as Comparative Example 3. Under conditions other than the above levels, the amount of normal grains discharged from the coarse grain outlet was significantly reduced compared to Comparative Example 1. The results are shown in Table 2.

[Example 4, Comparative Example 4]
Compared to Example 1, the installation angle of the current plate is 22 ° to 17.5 °, and the length is 90.2% (555 mm) to 94.3% (580 mm) with respect to the diameter of the sieve frame of the cylindrical vibration sieve device. ), The distance between the outer periphery of the flat plate portion without punch holes in the central portion of the sieve frame and the current plate is 6.5% (40 mm) to 4.9% (30 mm) with respect to the diameter of the sieve, and the width of the granular material channel opening The same method as in Example 1 at four levels of 1.6% (10 mm), 3.3% (20 mm), 7.3% (45 mm) and 11.4% (70 mm) with respect to the diameter of the sieve frame Sorted by. As a result, when the width of the granular material flow passage opening was 1.6% of the diameter of the sieve frame, the width of the granular flow passage opening was too narrow, so that the processing could not be completed and clogging occurred, causing overflow. Therefore, this level was set to Comparative Example 4. Under conditions other than the above levels, the amount of normal grains discharged from the coarse grain outlet was significantly reduced compared to Comparative Example 1. The results are shown in Table 3.

[Example 5, Comparative Example 5]
Compared to Example 1, the width of the powder channel opening was changed to three levels of 1.6% (10 mm), 7.3% (45 mm), and 11.4% (70 mm) with respect to the diameter of the sieve frame. Except for the above, selection was performed in the same manner as in Example 1 under the same conditions as in Example 1. As a result, when the width of the granular material flow passage opening was 1.6% of the diameter of the sieve frame, the width of the granular flow passage opening was too narrow, so that the processing could not be completed and clogging occurred, causing overflow. Therefore, this level was set as Comparative Example 5. Under conditions other than the above levels, the amount of normal grains discharged from the coarse grain outlet was significantly reduced compared to Comparative Example 1. The results are shown in Table 4.

[Example 6, Comparative Example 6]
Compared to Example 1, the installation angle of the current plate is 22 ° to 28.5 °, and the length is 90.2% (555 mm) to 85.4% (525 mm) with respect to the diameter of the sieve frame of the cylindrical vibration sieve device. ), The distance between the outer periphery of the flat plate portion without punch holes in the central portion of the sieve frame and the current plate is 6.5% (40 mm) to 11.4% (70 mm) with respect to the diameter of the sieve frame, and the width of the flow passage opening is set to Sorting was performed in the same manner as in Example 1 at three levels of 1.6% (10 mm), 3.3% (20 mm), and 7.3% (45 mm). As a result, when the width of the granular material flow passage opening was 1.6% of the diameter of the sieve frame, the width of the granular flow passage opening was too narrow, so that the processing could not be completed and clogging occurred, causing overflow. Therefore, this level was set as Comparative Example 6. Under conditions other than the above levels, the amount of normal grains discharged from the coarse grain outlet was significantly reduced compared to Comparative Example 1. The results are shown in Table 5.

  In the above-described embodiment, the example in which the cylindrical sieving apparatus according to the present invention is used for the selection process in the compound production of the thermoplastic resin has been described. However, as the processing object to be selected by the cylindrical sieving apparatus according to the present invention. Is not limited to a thermoplastic resin compound, and can be applied to sorting objects in all other fields.

  The cylindrical sieving apparatus according to the present invention and the method of selecting a granular material using the cylindrical sieving apparatus can be applied to the selection of any granular material that is required to reduce the amount of normal particles discharged to the coarse particle outlet, and as a whole device The yield of normal grains can be greatly improved.

DESCRIPTION OF SYMBOLS 1 Cylindrical sieve apparatus 2 Granule inlet 3 Raw material granular material 4 Sieve frame 5 Excitation means 6 Perforated plate (punching metal)
7 Upper sorting chamber 8 Coarse grain outlet 9 Powder after the coarse grain is removed 10 Middle sorting chamber 11 Perforated plate (punching metal)
12 Normal Grain Discharge Port 13 Powder 14 Lower Chamber 15 Powder Discharge Port 16 Prior Art Rectification Plate 21 Sieve Frame 22 Upper Sorting Chamber 23 Perforated Plate 24 Hole 25 Flat Plate Portion 26 Coarse Grain Discharge Port 27 Connection Portion 28 Rectification Plate 29 Circular Sieve Diameter 30 passing through the center of the frame 31 Granule flow passage port 31 Rectifier plate length adjustment mechanism 32 Extension portion 33 Connection portion A Region including the coarse particle discharge port Region B including the center of the circular sieve frame Center of the circular sieve frame L Distance between the outer periphery of the flat plate part and the current plate W Width of the granular material channel

Claims (9)

In the upper part, a vibrating perforated plate is provided in a sieve frame having a circular planar shape, which can sort the raw material granular material charged into the central part of the sieve frame into coarse particles and other granular materials. And a cylindrical sieve device having an upper sorting chamber provided with a coarse grain outlet for discharging coarse grains sorted on the perforated plate to the sieve frame, wherein one end of the upper sorting chamber has the end A rectifying plate that is connected to a position on one end side in the circumferential direction of the sieving frame of the coarse grain outlet of the sieving frame and that extends linearly longer than the radius of the circular sieving frame is provided. Is arranged so as to be inclined and extend toward the region including the coarse grain outlet, and on the extension line of the other end of the rectifying plate in the upper sorting chamber, the rectifying plate defines the rectifying plate. The coarse grain outlet is included from the area including the center of the circular sieve frame in the upper sorting chamber. Granular material on to the area the perforated plate provided with powder or granular material passage opening movable, the width of the powder and granular material flow path opening, is set more than 3% of the diameter of the circular sieve frame, the rectifying plate A cylindrical sieving apparatus, wherein a rectifying plate length adjusting mechanism capable of adjusting the length of the rectifying plate is provided at one end side portion of the granular material flow passage opening .   The cylindrical sieving apparatus according to claim 1, wherein the coarse grain outlet is provided at only one place in a circumferential direction of the sieving frame.   The length from the connection position to the said sieve frame of the said baffle plate to the end of the said granular material flow-path opening is set to 70% or more of the diameter of a circular sieve frame. Cylindrical sieve device.   The said baffle plate is arrange | positioned in the angle range of 5-28 degree | times with respect to the diameter direction of the sieve frame which passes along the connection position to the said sieve frame, and the center of a circular sieve frame. The cylindrical sieve device according to any one of the above.   The cylindrical sieving apparatus according to any one of claims 1 to 4, wherein a flat plate portion having no hole different from the perforated plate is provided at a central portion in the sieving frame. The cylindrical sieving apparatus according to any one of claims 1 to 5, wherein the rectifying plate length adjusting mechanism also serves as a width adjusting mechanism of the granular material channel opening. In the lower part of the upper sorting chamber, there is a granular material acquisition chamber capable of taking out the granular material after the coarse particles sorted in the upper sorting chamber are removed, or the coarse particles sorted in the upper sorting chamber. by further vibrating porous plate powder granules after removal having sortable central sorting room and powder of normal particle and less size within the target range, according to any one of claims 1 to 6 Cylindrical sieve device. A method for selecting a granular material, wherein the granular material is selected using the cylindrical sieving device according to any one of claims 1 to 7 . The method for selecting a granular material according to claim 8 , wherein the granular material is a resin pellet cut into a predetermined length.

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