JP4252398B2 - Sieve device - Google Patents

Description

  The present invention relates to a sieving apparatus for separating a mixture of small-diameter granules and large-diameter granules.

  The thermoplastic raw material resin used for injection molding and extrusion molding of resin products is produced as pellets (large-diameter granules) by finely cutting a rod-like body formed by extruding a molten resin. When the rod-shaped body is cut, chips (small-diameter granular bodies) are generated and mixed in the pellets. The mixed chips may cause troubles when performing injection molding or the like, and thus must be separated and removed.

As a sieving device for separating a mixture of solids with different particle sizes, a sieve screen with a large conical shape and opened on the large diameter side is rotated sideways, and the mixture to be separated inside is continuously conveyed by a belt conveyor. There are proposals to make it available. In this sieving device, the charged mixture is lowered to the large diameter side along the inclined inner peripheral surface of the sieving mesh, whereby the small diameter granular material is discharged from the through holes provided in the sieving mesh, The large-diameter granular material remaining inside is discharged from the opening on the large-diameter side (see, for example, Patent Document 1).
JP-A-9-75849

  However, in the sieving apparatus as described above, since the mixture is in a state where it is stacked without spreading over the entire sieving net, it is possible to efficiently discharge the small-diameter granular material from the through holes formed in the sieving net. Can not. Therefore, there exists a possibility that the small diameter granular material may remain mixed in the large diameter granular material. In addition, when the through-hole is small, the sieve mesh may be clogged by the large-diameter granular material, and particularly when the large-diameter granular material is a resin, it is more clogged by the influence of static electricity. It becomes easy.

  In view of such circumstances, the present invention is intended to provide a sieving apparatus that can efficiently separate a mixture of small-diameter granules and large-diameter granules and can also eliminate clogging of the sieve mesh. .

The invention of claim 1 is formed in a vertical bowl shape that opens upward, and has a size that allows only a small-diameter granule to selectively pass through a mixture of a small-diameter granule and a large-diameter granule supplied to the inside. And a first rotation drive unit that rotates the sieve mesh part around its center line, and the small-diameter granular material is obtained by a rotational centrifugal force applied to the sieve mesh part. , and discharged to the outside of the sieve screen portion through said hole, said larger diameter like body, a sieve device you discharged from the upper end periphery of the sieve screen portion to the outside of the sieve net unit, before Kifurui A small-diameter granular material receiving portion that covers a portion where the through hole is formed in a bottom view is formed below the mesh portion, and the small-diameter granular material receiving portion is the first rotation driving unit together with the sieve mesh portion. in rotated and starts selling ring-shaped small-diameter granular material recovery hopper covering the outer peripheral portion from the side over the entire circumference Providing a sieve device you wherein the obtaining.

A second aspect of the present invention, the small-diameter granular material recovery hopper bottom has been tilted in the circumferential direction, to claim 1, characterized in that the discharge port is provided at the lowest position of the bottom portion A sieving device as described is provided.

According to a third aspect of the present invention, the first rotation drive unit is disposed below the sieve mesh unit, and has a rotation drive source and a telescopic drive shaft that couples the rotation drive source to the bottom surface of the sieve mesh unit. Thus, the sieve mesh portion is supported so as to be movable up and down, and an elevating mechanism that repeats lifting and dropping operations of the sieve mesh portion is provided below the sieve mesh portion. A sieving device according to claim 1 or 2 is provided.

The invention according to claim 4, wherein the lifting mechanism, the sieve screen portion and in relatively rotatably provided under the sieve net unit, a lifting member for supporting the sieve screen portion at the upper surface side, of the lifting member A support member that supports the lower surface side, and a second rotation drive unit that rotates the elevating member, and a protrusion and / or a recessed portion on the track of the support member on the lower surface side of the elevating member. The sieving apparatus according to claim 3 is provided.

According to the sieving device of the first aspect of the present invention, the mixture supplied to the inside of the sieving mesh portion is largely expanded and moved upward along the entire inner peripheral surface of the sieving mesh portion by a rotational centrifugal force. Therefore, there is an effect that the large-diameter granule and the small-diameter granule can be efficiently separated. Moreover, since the sieve mesh part is formed in a bowl shape, the mixture is greatly spread as the mixture moves upward, and the applied rotational centrifugal force is also increased, so that the mixture is reliably separated. In particular, because the mixture moves spirally along the inner peripheral surface of the sieve mesh part due to the influence of the peripheral speed that increases toward the upper side of the sieve mesh part, the time that is applied to the sieve becomes longer and more reliably. To be separated. Furthermore, since the small-diameter granular material receiving portion is provided so as to cover a portion where the through-hole is formed in the lower surface view below the sieve mesh portion, it is possible to receive the small-diameter granular material falling downward from the through-hole. In addition, since the small-diameter granular material receiving portion is rotated together with the sieve mesh portion, the small-diameter granular material received by the rotational centrifugal force is discharged in the outer peripheral direction. In particular, since there is provided a small diameter particles member collecting hopper will covering the outer peripheral portion from the side over the entire circumference of the small diameter granules receiving, and is discharged laterally from the smaller diameter particulates member receiving part by centrifugal force A small-diameter granular material can be reliably captured.

According to the sieving device described in claim 2 of the present invention, in addition to the effect produced by the sieving device described in claim 1 , the following effect can be obtained. Since the bottom of the hopper for collecting the small-diameter granular material is inclined in the circumferential direction, the small-diameter granular material discharged from the small-diameter granular material receiving portion can be automatically collected at the lowest position in the circumferential direction. . Moreover, it can be easily transferred from the discharge port provided at the lowest position to an external collection container.

According to the sieving device according to claim 3 of the present invention, in addition to the effect exhibited by the sieving device according to claim 1 or 2 , the following effect can be obtained. Since the sieving part is supported so as to be movable up and down, and an elevating mechanism is provided below it and dropped, impact vibration can be easily applied. In addition, since the impact can be generated by utilizing the weight of the screen part itself, it can be configured at a lower cost than the case where an impact force generation source is provided.

According to the sieving device described in claim 4 of the present invention, in addition to the effect produced by the sieving device described in claim 3 , the following effect can be obtained. The lifting member that vibrates the sieve mesh part is rotated by a second rotational drive unit provided separately from the first rotational drive part that rotates the sieve mesh part, and impact vibration is applied to the sieve mesh part. The period can be set regardless of the rotation speed of the sieve screen. Therefore, it is possible to suppress the occurrence frequency of noise when rotating the elevating member at a low speed while rotating the sieve mesh part at a high speed to give impact vibration.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a sieving device 1 as an example of an embodiment for carrying out the present invention. The sieving device 1 supplies a sieve-shaped sieving part 2, a first rotation driving part 3 that rotates the sieving part 2 at a high speed, and a mixture M of small-diameter granule S and large-diameter granule B to the sieving part 2. Supply portion 4, a large-diameter granular material collecting hopper 5 that covers the peripheral edge of the upper end of the sieve mesh portion 2, a small-diameter granular material receiving portion 61 that covers the lower portion of the sieve mesh portion 2, and a small-diameter granular material receiving portion 61 A small-diameter granular material recovery hopper 62 that covers the peripheral edge portion 61 a and an elevating mechanism 7 provided below the sieve mesh portion 2 are provided.

  The sieving mesh unit 2 centrifuges the small-diameter granule S by being rotated at a high speed while the mixture M in which the small-diameter granule S and the large-diameter granule B are mixed is supplied inside. The sieve mesh portion 2 is formed in an inverted frustoconical saddle shape that is vertically arranged so as to open upward, and an annular body 21 that forms an inverted frustoconical large-diameter portion that becomes the upper peripheral edge, An aggregate 22 that extends downward from the annular body 21 at a predetermined interval in the circumferential direction and forms an inverted frustoconical side circumferential surface and a bottom (small-diameter) framework, and is attached along the inner surface of the aggregate 22. A net member 23 and a conical protruding member 24 formed at the center of the bottom surface on the inner surface side are provided. The mesh member 23 is formed with a through hole 23a smaller than the particle diameter of the large-diameter granular material B, and the through-hole 23a can selectively pass only the small-diameter granular material S.

  The 1st rotation drive part 3 is arrange | positioned under the sieve mesh part 2, and rotates the sieve mesh part 2 around the centerline at high speed. The first rotation drive unit 3 includes a drive motor 31 provided on the fixed side and serving as a rotation drive source for the screen unit 2, a drive shaft 32 that connects the bottom surface of the screen unit 2 and the drive motor 31, and a drive shaft 32. It consists of a bearing portion 33 that rotatably supports a midway portion. The drive shaft 32 has an upper shaft portion 32a fixed to the sieve mesh portion 2, a lower shaft portion 32b fixed to the output shaft of the drive motor 31, and a coil spring shape connecting the upper shaft portion 32a and the lower shaft portion 32b. Intermediate shaft portion 32c, and the intermediate shaft portion 32c is extendable in the axial direction. Thereby, the sieve mesh part 2 connected with the drive shaft 32 is supported so that it can move up and down with respect to the fixed side.

  The supply unit 4 is a member that supplies the mixture M to the inside of the sieve mesh unit 2, and is connected to the funnel-shaped supply hopper 41 into which the mixture M is charged and the lower part thereof so as to be close to the protruding member 24. It consists of the cylindrical supply pipe | tube 42 extended. The supply of the mixture M to the supply hopper 41 is continuously performed by a conveyor (not shown).

  The large-diameter granular material collecting hopper 5 is formed in an annular shape as a whole, and an outer peripheral wall portion 51 that covers the annular body 21 that is the upper peripheral edge portion of the sieve mesh portion 2 from above over the entire periphery, and an outer peripheral wall portion The inner peripheral wall portion 52 is formed so as to face the annular body 21 and closes the gap with the annular body 21, and the bottom portion 53 is provided so as to connect the outer peripheral wall portion 51 and the inner peripheral wall portion 52. The outer peripheral wall portion 51 is curved so as to be directed downward from the upper end 51a. The curved portion 51b receives the large-diameter granular material B discharged from the sieve mesh portion 2 and smoothly guides it downward. ing. Therefore, it is possible to prevent the large-diameter granular material B from colliding with the outer peripheral wall portion 51 vigorously and being crushed.

  As shown by the dotted line, the bottom 53 is inclined in the circumferential direction, and the large-diameter granular material B discharged from the sieve mesh part 2 rolls the inclination and is collected at the lowest position and provided there. It can be dropped from the discharged outlet 53a and can be easily transferred to the collection container 81 installed outside.

  The small-diameter granular material receiving part 61 is a disk-shaped plate-like body that extends in the horizontal direction, is provided below the sieve mesh part 2, and covers a portion where the through holes 23a of the sieve mesh part 2 are formed in a bottom view. It is formed as follows. The small-diameter granular material receiving part 61 is coaxially fixed to the sieve mesh part 2 side so as to be rotated by the first rotation drive part 3 together with the sieve mesh part 2. Accordingly, the small-diameter granular material S that has fallen below the sieve mesh portion 2 from the through-hole 23a is received by the small-diameter granular material receiving portion 61, and outwardly from the outer peripheral edge portion 61a of the small-diameter granular material receiving portion 61 by the rotational centrifugal force. Will be discharged.

  The small-diameter granular material collecting hopper 62 is formed in an annular shape as a whole, and an outer peripheral wall portion 63 that covers the outer peripheral edge portion 61 a of the small-diameter granular material receiving portion 61 from the side over the entire circumference, and an outer peripheral wall portion 63. It has an inner peripheral wall portion 64 formed so as to face each other, and a bottom portion 65 provided so as to connect the outer peripheral wall portion 63 and the inner peripheral wall portion 64. Therefore, the small-diameter granular material S discharged from the small-diameter granular material receiving portion 61 to the side by the rotational centrifugal force can be reliably captured and recovered.

  The bottom portion 65 is inclined in the circumferential direction as indicated by a dotted line, and the small-diameter granular material S discharged from the small-diameter granular material receiving portion 61 rolls on the inclination and is collected at the lowest position. It can be dropped from the provided outlet 65a and easily transferred to a collection container 82 installed outside.

  The elevating mechanism 7 gives impact vibration to the sieve screen portion 2 by moving the rotating mesh screen portion 2 up and down. The elevating mechanism 7 includes a support member 71 provided on the fixed side, an elevating member 72 supported on the lower surface side by the support member 71, and a second rotation drive unit 73 provided on the elevating member 72. The support member 71 is a rod-like member that is arranged at equal intervals around the drive shaft 32, and a rotating roller 71 a that supports the elevating member 72 is provided at the tip of the support member 71.

  The elevating member 72 is provided so as to be rotatable relative to the drive shaft 32, and is supported so as to be rotated by rolling of the rotating roller 71a. Moreover, the raising / lowering member 72 is supporting the sieve mesh part 2 on the upper surface via the thrust bearing 72b rotatably. Furthermore, on the track of the rotating roller 71a on the lower surface side of the elevating member 72, protrusions 72a are provided at equal intervals so as to correspond to the rotating roller 71a (FIG. 2A). Further, it is formed in a wedge shape with the rotation direction as a tip (FIG. 2B), and can smoothly ride on the rotation roller 71a.

  Therefore, when the elevating member 72 is rotated, the protruding portion 72a on the lower surface side periodically climbs onto the rotating roller 71a and rises, and falls when it passes through the protruding portion 72a. In addition, since the rear end of the protrusion 72a is cut off at a substantially right angle, it receives impact vibration when dropped. Therefore, by rotating the elevating member 72, periodic impact vibration is also applied to the sieve mesh portion 2 supported by the elevating member 72 in the thrust direction. In addition, since an impact can be generated using the weight of the screen part 2 itself, it can be configured at a lower cost than the case where an impact force generation source is provided.

  The second rotation drive unit 73 includes a belt pulley 73a fixed to the lower surface side of the elevating member 72, a belt 73b wound around the belt pulley 73a, and a drive motor 73c (not shown) that rotates the belt pulley 73a via the belt 73b. Become. Since the second rotation drive unit 73 is provided separately from the first rotation drive unit 3, the period of impact vibration applied to the sieve mesh unit 2 can be set regardless of the rotation speed of the sieve mesh unit 2. It has become. Therefore, it is possible to suppress noise when the elevating member 72 is rotated at a low speed to give an impact vibration, and the high speed rotation of the screen portion 2 is not hindered.

  Next, the operation of the above-described embodiment will be described.

  First, when the mixture M in which the small-diameter granular material S and the large-diameter granular material B are mixed is supplied to the center of the bottom surface inside the sieve mesh unit 2 rotated by the first rotation driving unit 3 through the supply unit 4, M is spread evenly in the circumferential direction of the screen portion 2 by the protruding members 24. Furthermore, since the mixture M is greatly expanded and moved upward along the entire inner peripheral surface of the sieve mesh portion 2 by the rotational centrifugal force, the mixed small-diameter granular material S is efficiently and reliably transferred from the through holes 23a. Will be separated and removed. Since the sieve mesh portion 2 is formed in an inverted conical bowl shape whose diameter increases toward the upper side, the mixture M is spread thinner and thinner as it moves upward, and the applied rotational centrifugal force also increases. Thus, the separation can be performed more reliably. In addition, since the mixture M moves upward spirally along the inner peripheral surface of the sieve mesh part 2 due to the influence of the rotational peripheral speed that increases as it goes upward of the sieve mesh part 2, the time required for the sieve is long. And more reliably separated.

  The large-diameter granular material B remaining in the sieve mesh part 2 is further raised by the rotational centrifugal force, and is automatically discharged to the outside from the peripheral edge of the upper end. Therefore, in order to take out the large-diameter granular material B from the sieve mesh part 2, there is no need to stop the sieve device 1 or turn the sieve mesh part 2 over. The large-diameter granule B and the small-diameter granule S discharged to the outside of the sieve mesh part 2 are separately collected by the large-diameter granule collection hopper 5 and the small-diameter granule collection hopper 62, and the collection containers 81 and 82, respectively. Therefore, the separated small-diameter granule S and large-diameter granule B are reliably prevented from being mixed again.

  Now, the small-diameter granular material S may be adsorbed to the sieve mesh part 2 due to the influence of static electricity and the like, and the area around the through hole 23a may be clogged. However, the sieve mesh part 2 is periodically lifted by the lifting mechanism 7 and dropped. Therefore, the small-diameter granular material S is knocked down from the through hole 23a by the impact vibration, and the clogging is eliminated. Further, since the impact vibration is applied in the direction of the rotation axis of the screen portion 2, the rotation of the screen portion 2 does not cause radial blurring, and the separation by the rotational centrifugal force is stably performed. Furthermore, because of the downward impact vibration, the small-diameter granular material will be struck down to the lower side of the sieve mesh part, that is, outside, and there is no risk of falling inside the sieve mesh part. Is something that can be done.

  In the above embodiment, the projection 72a is provided on the lower surface of the elevating member 72 in order to give impact vibration to the sieve mesh portion 2, but a concave depression may be provided, and the projection and depression are combined. May be.

  The sieving apparatus of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

The side view of the sieve apparatus which concerns on this embodiment. (A) is a top view of the raising / lowering member of the sieve apparatus which concerns on this embodiment. (B) is A view of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sieve apparatus 2 Sieve net part 21 Annulus (Upper peripheral part)
23a Through-hole 24 Protruding member 3 First rotation drive unit 31 First drive motor 4 Supply unit 5 Large-diameter granular material recovery hopper 51 Outer peripheral wall 51a Outer peripheral wall (upper end)
51b Curved portion 53 Bottom portion 53a Discharge port 61 Small diameter granular material receiving portion 61a Small diameter granular material receiving portion (outer peripheral edge portion)
62 Small-diameter granular material recovery hopper 63 Outer peripheral wall portion 65 Bottom portion 65a Discharge port 7 Elevating mechanism 71 Support member 72 Elevating member 72a Protruding portion 73 Second rotational drive unit 81, 82 Recovery container B Large-diameter granular material S Small-diameter granular material M Mixture

Claims (4)

A sieve mesh formed in a vertical bowl shape that opens upward and having a through-hole having a size that allows only small-diameter particles to pass through a mixture of small-diameter granules and large-diameter granules supplied inside. And
A first rotation drive unit that rotates the sieve mesh part around its center line,
Due to the rotational centrifugal force applied to the sieve mesh portion, the small-diameter granular material is discharged to the outside of the sieve mesh portion through the through holes, and the large-diameter granular material is discharged from the upper peripheral edge of the sieve mesh portion to the sieve. a sieve device you discharged outside the mesh part,
Below the front Kifurui network portion, the small diameter granules receiving portion covering the portion where the through hole in the bottom view is formed are the forms, the small granules receiving portion, the first with the sieve screen portion It is rotated at a rotation driving unit, and a sieve device you characterized in that over the outer peripheral edge portion in the entire circumference provided with cormorants ring-shaped small-diameter granular material recovery hopper covering from the side. The small diameter granules collecting hopper bottom has been tilted in the circumferential direction, the sieve device according to claim 1, characterized in that the discharge port is provided at the lowest position of the bottom portion. The first rotational drive unit is disposed below the sieve mesh unit, and has a rotational drive source and a telescopic drive shaft that couples the rotational drive source to the bottom surface of the sieve mesh unit. It supports the net part so that it can move up and down ,
Below the sieve net unit, sieve device according to claim 1 or 2, characterized in that the lifting mechanism is provided to repeat the lifting and dropping operation the sieve screen unit. The elevating mechanism is provided below the sieve mesh part so as to be rotatable relative to the sieve mesh part,
An elevating member for supporting the sieve mesh part on the upper surface side;
A support member for supporting the lower surface side of the elevating member;
A second rotation drive unit for rotating the elevating member,
The sieving apparatus according to claim 3 , wherein a protrusion and / or a depression is formed on a track of the support member on a lower surface side of the elevating member.

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