JP2001069905A - Screening system and screening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screening machine and a screening method that show excellent workability without deterioration in the commodity value and the freshness of the articles to be screened and can screen the articles mechanically. SOLUTION: In the screening machine 10 that is provided with a plurality of rotary screening roller 22-29 at a prescribed interval over the conveying table 21 that loads the articles to be fed to the table 21 and to be screened and the articles that are in the screening, the conveying table 21 is inclined at a prescribed angle of α, the screening rollers 22-29 are each a long roller main body 30 having a certain diameter D in the longitudinal direction and has the projection pieces 33 for conveying that are formed in a spiral at a needed pitch on the outer periphery of the roller main body 30 and is arranged at an prescribed angle of β. At the same time, individual screening rollers 22-29 are made narrower from the upstream to the downstream according to the size of the articles to be screened in the gap G between the bottom end of the conveying projection piece 33 and the upper face of the conveying table 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sorting apparatus and a method for mechanically sorting, for example, caught shrimp, which is an object to be sorted, into several sizes.

[0002]

2. Description of the Related Art Crawled shrimp, which are to be sorted, are sorted in several stages in a fishing boat or a sorting ground after landing. Conventionally, as a method of sorting shrimp, for example,
In some cases, it is performed manually in order to prevent shrimp whiskers from falling and reducing the product value. In addition, as a method of mechanically sorting, the two long rollers to be paired are inclined at a predetermined angle, and the gap between the two rollers is sequentially widened along the downward inclination so that the rollers are paired. While rotating in a certain direction, by supplying a certain amount of shrimp to the upstream side of the roller, shrimp of a small size on the upstream side,
On the downstream side, large-sized shrimp are sorted.

[0003]

However, the conventional shrimp selection method has the following problems to be solved. If done manually,
Although the shrimp can be avoided from being damaged, the workability is poor. As a result, there is a problem that the freshness of the shrimp cannot be maintained at a high level, and the labor cost increases. In addition, sorting efficiency was low due to visual sorting. Further, in the case of mechanically sorting by a roller, there is a problem that the shrimp is compressed between the rollers and is damaged, thereby reducing the commercial value. For this reason, for example, half of the catch is mechanically selected, while the other half is manually performed. In addition, since the sorting efficiency is low at the time of mechanical sorting, a further manual sorting operation is required to increase the sorting efficiency.

[0004] The present invention has been made in view of such circumstances, without reducing the freshness and commercial value of the selected product,
It is an object of the present invention to provide a sorting apparatus which is excellent in workability and can mechanically sort an object to be sorted, and a method therefor.

[0005]

According to the present invention, there is provided a sorting apparatus, comprising: a transport table on which a material to be supplied and a material to be sorted are mounted; and a predetermined distance above the transport table. And a plurality of rotating selection rollers arranged with the opening open, wherein the transport table is inclined at a predetermined angle, and the selection roller is a long roller having a constant outer diameter in the length direction. A main body, and a feed projection spirally formed at a required pitch on the outer periphery of the roller main body, and are arranged at a predetermined angle with respect to the sorting object falling direction of the transport table in plan view. In addition, in each of the sorting rollers, the gap between the lower end of the feed projection piece and the upper surface of the transport table is set so as to be gradually narrower from the upstream side to the downstream side according to the size of the sorting object to be sorted. As a result, the sorted objects that cannot be passed through the gaps of the respective sorting rollers and are conveyed downward by the rotation of the feed projection spirally formed on the roller body, and the sorted objects that pass through the gaps of the respective sorting rollers. Can be sequentially and mechanically sorted.

[0006] In the sorting apparatus according to the present invention, it is possible to provide a watering means for spraying water from the upstream side to the sorting object on the transport table. As a result, it is possible to suppress the damage of the sorting object due to the buffer of the sprinkling water. In the sorting apparatus according to the present invention, a vibrating means for vibrating the transfer table may be provided. Thereby, the objects to be sorted can be evenly supplied to the sorting rollers. In the sorting device according to the present invention, each sorting roller may include a gap adjusting mechanism that adjusts a gap between the lower end of the outer periphery of the roller body and the upper surface of the transport table. Thereby, for example, it is possible to adjust the size to be sorted according to the lots having different sizes of the objects to be sorted, or according to the request of the customer. In the sorting device according to the present invention, the roller main body and the feed projection piece may be made of aluminum. Since aluminum is a soft material, it is possible to prevent damage to the sorting object. In the sorting device according to the present invention, a plurality of sorting rollers may be driven by one drive source. This makes it possible to mechanically keep the phase of the feed projection provided on the sorting roller constant.

[0007] According to the present invention, there is provided a screening method comprising:
In a sorting method in which a large number of objects to be sorted are supplied to a transport table and sorted by a plurality of sizes, the transport table is inclined at a predetermined angle, and has a constant outer diameter in a length direction above the transport table. A plurality of sorting rollers each having a roller body and a feed projection spirally formed at a required pitch on the outer periphery of the roller body are arranged. And the gap between the lower end of the feed projection and the upper surface of the transfer table is set narrower in order from upstream to downstream, and sorting is performed while dropping the sorted material on the transfer table. The rollers are rotated to sort the objects sequentially. As a result, the sorted objects that cannot be passed through the gaps of the respective sorting rollers and are conveyed downward by the rotation of the feed projection spirally formed on the roller body, and the sorted objects that pass through the gaps of the respective sorting rollers. Can be sequentially and mechanically sorted. In the sorting method according to the present invention, the sorting object can be sorted while watering is performed from the upstream side. As a result, it is possible to suppress the damage of the sorting object due to the buffer of the sprinkling water. In the sorting method according to the present invention, the sorting object can be sorted while the transfer table is vibrated. As a result, water for watering becomes unnecessary.

In the sorting method according to the present invention, the gap between the lower end of the feeding projection and the upper surface of the transfer table is set to 1 mm or more in accordance with the size of the sorting target object. The height from the outer periphery of the main body can be set to 2 mm or more. As a result, the workability is further improved, and the sorting target having a higher commercial value can be selected. Here, the reason why the gap between the lower end of the feed projection piece and the upper surface of the transfer table is set to 1 mm or more is that the gap is 1 m.
This is because, when it is less than m, the passage of minute substances or water sprinkled with the sorting object is suppressed. Also, the height of the feed projection from the outer periphery of the roller body is 2 m.
The reason for setting the distance to m or more is that if the height is less than 2 mm, the effect of feeding the sorting object by the feeding projections decreases.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic plan view of a shrimp sorting facility using the sorting apparatus according to one embodiment of the present invention, FIG. 2 is a schematic front view of a shrimp sorting facility using the sorting apparatus, and FIG. FIG. 4 is a front sectional view of a sorting roller and a gap adjusting mechanism of the sorting apparatus. FIG. 4 is a plan view of a sorting roller and a gap adjusting mechanism of the sorting apparatus. As shown in FIGS. 1 and 2, a shrimp sorting facility A that uses a shrimp sorting apparatus 10 according to an embodiment of the present invention to sort shrimp, which is an example of an object to be sorted, has a large amount of Shrimp supply device 11 for supplying shrimp
And a distribution chute device 12 that sorts the shrimp selected according to the size by the selection device 10. Hereinafter, these will be described in detail.

As shown in FIG. 1 and FIG. 2, a shrimp supply device 11 includes a supply table 13 for supplying a large amount of shrimp conveyed by a conveyor or the like (not shown) to a downstream side, and a shrimp supplied from the supply table 13. Tank 1 for storing shrimp and stirring shrimp by a jet of water supplied from below
4, a supply gutter 15 for transferring shrimp to the downstream side together with water overflowing from the upper opening of the storage tank 14, and a guide cover 1 for guiding the shrimp supplied from the supply gutter 15.
6, a net conveyer 17 that is inclined downward and conveys shrimp that is guided by the guide cover 16 and that drops, and a chute that supplies the shrimp that drops from the downstream end of the net conveyer 17 to the sorting device 10. 18.

A water supply port 19 for supplying water for stirring the shrimp is provided at the lower end of the storage tank 14 so that the shrimp is stirred by the jet of water from the lower end in the storage tank 14. Make up. At the upper end of the chute 18 inclined downward on the downstream side, a watering pipe 20 for feeding shrimp falling from the net conveyor 17 to the sorting device 10 by the flow of water is provided, and the watering pipe 20 is downstream of the watering pipe 20 in the width direction of the chute 18. On the side, a small-diameter water sprinkling hole is formed to uniformly spray water. The amount of water spray varies depending on the inclination angle γ of the chute 18, the amount of shrimp transported (shrimp processing amount), the size of the shrimp, etc.
It is about 150 liters / minute.

The sorting apparatus 10 includes a transfer table 21 on which a shrimp is mounted, which is arranged at a small interval below the downstream end of the chute 18 with its upstream end overlapping.
A plurality of (eight in this embodiment) rotating sorting rollers 22 to 29 arranged at a predetermined interval above the transport table 21, and the sorting rollers 22 to 29 are driven by one drive source (Not shown). The transfer table 21 has a rectangular shape in plan view, and is fixed at a predetermined angle α (about 15 to 60 °) at a predetermined angle α to an assembly stand (not shown). At the upstream end of the transfer table 21, a watering pipe 67 having a large number of small-diameter watering holes, which is an example of watering means for watering from the upstream side in the width W direction of the transfer table 21, is disposed. By injecting water from the watering holes of the watering pipe 67, the water can be uniformly flowed on the transfer table 21 in the falling direction, thereby conveying the shrimp in the downstream direction, and allowing water to flow between the shrimp. Acts as a cushion.
The amount of water spray varies depending on the inclination angle α of the transport table 21, the amount of shrimp transport, the size of shrimp, etc.
The width is about 100 to 200 liters / minute per one width W (1 m).

As shown in FIG. 3 and FIG.
2 (same for 23 to 29) has a constant outer diameter D (2
(About 0 to 50 mm), a long roller body 30 made of aluminum, bearings 31 and 32 provided on both sides of the roller body 30, and a required pitch P on the outer circumference of the roller body 30.
It has a winding 33 which is an example of a feeding projection piece spirally formed (about 30 to 90 mm). Sorting roller 2
2 is arranged to be inclined at a predetermined angle β (about 30 to 70 °) with respect to the shrimp falling direction of the transfer table 21 in plan view. As shown in the enlarged view of FIG.
It is made of a thin aluminum wire having a diameter d, and is attached to the surface of the roller body 30 so as to abut a spiral groove formed at a depth t (about 1 mm). Diameter d of winding 33
(3 mm or more), from the upstream side (the sorting roller 22 side) to the downstream side (the sorting roller 29 side) depending on the size of the shrimp, so that the shrimp can be reliably transported along the sorting roller 22 by the rotation of the winding 33. It is set so that it becomes smaller sequentially. Therefore, the height h of the winding 33 from the outer periphery of the roller body 30 is h = dt, and h is set to 2 mm or more.
As shown in FIG. 3, each of the sorting rollers 22 to 29 has a winding 3
3 and the gap G (1 mm
The above is set so as to gradually narrow from the upstream side to the downstream side according to the size of the shrimp to be selected. Therefore,
The shrimp passing through the gap G is transported to the downstream sorting roller,
On the other hand, the shrimp that cannot pass through the gap G is conveyed to the downstream side along the sorting roller by the winding 33.

As shown in FIGS. 3 and 4, on both sides of each of the sorting rollers 22 to 29, a pair of gap adjusting mechanisms 34 and 35 for adjusting the gap G between the lower end of the winding 33 and the upper surface of the transport table 21. It has. Since the gap adjusting mechanism 34 and the gap adjusting mechanism 35 have substantially the same configuration, only the gap adjusting mechanism 35 will be described, and the same components as those of the gap adjusting mechanism 34 will be denoted by the same reference numerals. , The same symbols are assigned to alphabets and detailed description is omitted.

The gap adjusting mechanism 35 is connected to the sorting roller 22 (2
(The same applies to 3 to 29). The bearing block 36 rotatably supports the bearing portion 31 and the male screw portion 37 screwed into a female screw portion (not shown) formed by penetrating the bearing block 36 in the thickness direction. And a gap adjusting screw shaft 38 having the same. The bearing 39 at the lower end of the gap adjusting screw shaft 38 is attached to a mounting bracket 4 having a mountain-shaped cross section, which is fixed to an assembling stand (not shown).
0 is rotatably supported by a bearing hole 41 formed on the lower side. The bearing portion 42 above the clearance adjusting screw shaft 38 is rotatably supported by a bearing hole 44 formed on the upper side of the mounting bracket 43 having a mountain-shaped cross section, which is detachably mounted on the mounting bracket 40 with bolts and nuts. ing. The pitch of the screws formed on the female screw portion and the male screw portion 37 is 1 mm. At the upper end of the bearing portion 42 of the gap adjusting screw shaft 38, an adjusting handle 45 capable of manually rotating the gap adjusting screw shaft 38 is provided. The adjusting handle 45 is a cylindrical vertical detachable to the bearing portion 42. Part 4
6 and a rod-shaped handle portion 4 that fits into a through hole formed through the vertical portion 46 in the horizontal direction at the upper end of the vertical portion 46.
7.

As shown in FIG.
In the vicinity of a bearing hole 41 formed on the lower side, a female screw is formed penetrating in the thickness direction, and a zero adjustment bolt 49 having a male screw 48 screwed to the female screw is attached. The upper end of the zero adjustment bolt 49 is the bearing block 3
6 is in contact with the lower surface. The zero point adjusting bolt 49 is used for setting the gap G. Once the height is adjusted, the zero point adjusting bolt 49 may be fixed to the mounting bracket 40. Screws are formed in order to achieve this. The pitch of the screw of the zero point adjusting bolt 49 is 1 mm, and the zero point adjusting bolt 49 is moved up and down by 1 mm when the zero point adjusting bolt 49 is rotated one turn in the normal and reverse directions. A coil spring 52, which is an example of an urging member, is mounted in a compressed state between the lower surface of the upper side of the mounting bracket 43 and the upper surface of the bearing block 36 via annular seat plates 50, 51 provided vertically. As a result, the sorting roller 22 is urged downward through the bearing block 36. When the handle portion 47 of the adjustment handle 45 makes one full rotation in the forward and reverse directions, the sorting roller 22 moves up and down by 1 mm via the bearing block 36.

As shown in FIGS. 3 and 4, on the upper surface of the upper side of the mounting bracket 43, an annular rotary scale plate 53 is mounted via mounting bolts 54. The rotation scale plate 53 measures the amount of rotation of the handle 45, and has an arc-shaped long hole 55 for mounting adjustment.
A mark 5 indicating the angle at a predetermined interval on the periphery
6 are provided at 10 locations. The tip portion 57 of the handle portion 47 formed in a pointed shape is colored red in a shaded portion so as to correspond to the mark 56. As shown in FIGS. 1 and 2, the distribution chute device 12 that sorts the shrimp selected according to the size by the selection device 10 includes a distribution chute 58 disposed on the opposite side of the net conveyor 17 of the transport table 21. 65 and a gutter-shaped discharge chute 66 into which the shrimp that has passed through the sorting roller 29 is inserted.

Next, the shrimp sorting operation performed by the shrimp sorting equipment A using the sorting apparatus 10 according to one embodiment of the present invention will be described with reference to the drawings. (1) As shown in FIG. 3, in each of the sorting rollers 22 to 29, the lower end of the winding wire 33 and the transport table 21 are moved by the respective zero-point adjusting bolts 49 and gap adjusting mechanisms 34 and 35.
Is set so as to gradually narrow from the upstream side to the downstream side according to the size of the shrimp to be sorted. (2) Water is supplied from below into the storage tank 14, the net conveyor 17 is operated, water is sprayed on the chute 18 by the watering pipe 20, and the sorting rollers 22 to 29 are sprinkled on the transport table 21 by the watering pipe 67. Rotate. (3) As shown in FIG. 2, when a large amount of shrimp mounted on the supply table 13 is put into the storage tank 14 manually or the like, the shrimp is stirred by the jet of water in the storage tank 14,
The shrimp overflowing from the storage tank 14 is supplied to the upstream side (lower end position) of the net conveyor 17 via the supply gutter 15 and is downstream by the net conveyor 17 (upper end position).
And falls from the downstream end of the net conveyor 17 to the chute 18.

(4) The shrimp that has fallen on the chute 18 descends on the chute 18 by water jetted from the watering pipe 20 and falls on the transport table 21. (5) The shrimp that has dropped onto the transport table 21 descends on the transport table 21 and reaches the sorting roller 22 while gradually spreading in the width W direction of the transport table 21 due to the water jetted from the watering pipe 67. (6) In the sorting roller 22, the shrimp larger than the set gap G comes into contact with the lower end of the rotating winding 33 and descends on the transport table 21 along the axial direction of the sorting roller 22.
It is thrown into the distribution chute 58. On the other hand, the shrimp smaller than the gap G between the lower end of the set winding 33 and the upper surface of the transport table 21 descends on the transport table 21 while passing through the gap G and flowing down to the water, and passes through the lower sorting roller 23. To reach. (7) Similarly to the sorting roller 22, the sorting rollers 23 to 29 cannot pass through the sorting rollers 23 to 29,
The shrimp thrown into each of the distribution chutes 59 to 65 and the shrimp passing through the sorting rollers 23 to 29 and descending on the transport table 21 are sorted.

(8) The shrimp that passes through the gap G between the sorting rollers 29 and further descends on the transport table 21 is thrown into a discharge chute 66 disposed below the downstream end of the transport table 21. (9) The above operation is performed in a continuous or batch manner, and the shrimp sorting operation of a predetermined lot is completed. (10) When sorting shrimp of another lot,
The gap G between the lower end of the winding 33 and the upper surface of the transport table 21 is reset by the zero point adjusting bolt 49 and the gap adjusting mechanisms 34 and 35. Therefore, in the method of sorting shrimp using the sorting device 10, since it is performed mechanically without manual operation,
The sorting workability is improved, the freshness can be kept high, and the working cost can be reduced. At the same time, the shrimp on the transfer table 21 is sprinkled from the upstream side to flush the shrimp, while changing the gap G and sequentially sorting by the plurality of sorting rollers 22 to 29 provided with the windings 33, so that water is applied to the cushion. The sorting roller 22
29 and / or the transfer table 21 can prevent the shrimp from being damaged, and maintain the commercial value.

In the above embodiment, the sorting device 10
Was used for sorting shrimp, but the present invention is not limited to this, and the present invention can be applied to marine products such as scallop, eel, or clam, as well as fruits, vegetables, and other items. Although the watering means for watering the shrimp from the upstream side is provided, it is not necessary to provide the watering means depending on the kind of the sorting object. When the inclination angle α of the transfer table 21 is reduced in order to avoid the problem of the jumping of the selection object when supplying the selection object to the transfer table 21, the transfer table 21 is vibrated by the vibration means. Thus, the sorting object can be easily dropped to the downstream side. Although the gap adjusting mechanisms 34 and 35 are provided, the invention is not limited to this. If shrimp of the same size lot are always sorted to the same size, the gap adjusting mechanism may not be provided. Shrimp supply device 11
Is used to supply the shrimp to the sorting device 10, but if necessary, the shrimp can be directly supplied to the sorting device 10 without using the shrimp supply device. Although the material of the transfer table 21 has not been mentioned, it can be made of stainless steel, or a resin having a low friction coefficient can be used in consideration of the ease of the shrimp slip. As a result, the inclination angle α of the transfer table 21 can be reduced, and as a result,
The height of the shrimp supply device 11 can be reduced, and this is particularly effective in existing remodeling work.

Although eight sorting rollers are used, the present invention is not limited to this, and two to seven or nine or more sorting rollers may be used. Although the sorting rollers 22 to 29 are driven by one driving source, the present invention is not limited to this.
9 can be controlled in the same manner.
A drive source can be provided for every ~ 29. Although the winding 33 made of an aluminum thin wire is attached to the outer periphery of the aluminum roller main body 30 as the feed projection piece, it can be cut out from the aluminum roller main body in an integrated structure. Although the roller body and the winding are made of aluminum, they may be made of stainless steel or other materials. The winding 33 has a circular cross section, but may have an elliptical shape, an elliptical shape, or another shape.

[0023]

In the sorting apparatus according to the first to sixth aspects and the sorting method according to the seventh to tenth aspects, the object to be sorted that passes through the gap between each sorting roller and the sorting object that cannot pass through the gap between each sorting roller. Since the object to be conveyed downward can be mechanically and sequentially sorted by the rotation of the feeding projection piece formed spirally on the roller body, workability is improved, and as a result, freshness is maintained high. Can maintain high commercial value.
In particular, in the sorting device according to the second aspect and the sorting method according to the eighth aspect, the shrimp is not damaged by the buffer of the water to be sprinkled, so that the commercial value can be further maintained. In the sorting apparatus according to the third aspect and the sorting method according to the ninth aspect, the inclination angle of the transfer table can be reduced, so that the apparatus can be made compact and water is not used, so that it is economical. In the sorting apparatus according to the fourth aspect, the size to be sorted can be adjusted according to the lots having different sizes of the sorting objects or the request of the customer, so that the versatility is improved.

In the sorting apparatus according to the fifth aspect, since aluminum is a soft material, damage to the sorting object is suppressed, so that the commercial value can be kept higher. In the sorting device according to the sixth aspect, since the phase of the feed projection provided on the sorting roller can be mechanically kept constant, the sorting efficiency can be improved. In the sorting method according to claim 10, the gap between the lower end of the feeding projection and the upper surface of the transport table and the height of the feeding projection from the outer periphery of the roller body are determined according to the size of the sorting target object. Is set in a predetermined range, the workability is further improved, and the sorting target having a higher commercial value can be selected.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of shrimp sorting equipment using a sorting device according to an embodiment of the present invention.

FIG. 2 is a schematic front view of a shrimp sorting facility using the sorting apparatus.

FIG. 3 is a front sectional view of a sorting roller and a gap adjusting mechanism of the sorting apparatus.

FIG. 4 is a plan view of a sorting roller and a gap adjusting mechanism of the sorting apparatus.

[Explanation of symbols]

A: shrimp sorting equipment, 10: sorting device, 11: shrimp supply device, 12: distribution chute device, 13: supply table,
14: storage tank, 15: supply gutter, 16: guide cover, 1
7: net conveyor, 18: chute, 19: water supply port, 20: watering pipe, 21: transport table, 22-2
9: sorting roller, 30: roller body, 31, 32: bearing portion, 33: winding (feeding projection piece), 34, 35: gap adjusting mechanism, 36, 36a: bearing block, 37: male thread portion, 38, 38a : Clearance adjustment screw shaft, 39: bearing part, 4
0, 40a: mounting bracket, 41: bearing hole, 42:
Bearing part, 43, 43a: mounting bracket, 44: bearing hole, 45: adjustment handle, 46: vertical part, 47: handle part, 48: male screw, 49: zero point adjustment bolt, 50, 5
1: seat plate, 52: coil spring (biasing member), 5
3: rotating scale plate, 54: mounting bolt, 55: slot,
56: mark, 57: tip, 58-65: distribution chute, 66: discharge chute, 67: watering pipe (watering means)

Claims (10)

[Claims] 1. A transport table on which a sorting object to be supplied and the sorting object to be sorted are mounted, and a plurality of rotating sorting rollers arranged at a predetermined interval above the transport table. A sorting device, wherein the transport table is inclined at a predetermined angle, the sorting roller has a long roller body having a constant outer diameter in a length direction, and a required pitch on an outer periphery of the roller body. A feed projection piece formed in a spiral shape, and are arranged at a predetermined angle with respect to the sorting object falling direction of the transport table in a plan view, and each of the sorting rollers is A sorting device, wherein a gap between a lower end of the feed projection piece and an upper surface of the transport table is sequentially narrowed from an upstream side to a downstream side in accordance with the size of the sorting object to be sorted. 2. The sorting apparatus according to claim 1, further comprising a watering means for spraying water from the upstream side on the object to be sorted on the transport table. 3. The sorting device according to claim 1, further comprising a vibration unit that vibrates the transfer table. 4. The sorting device according to claim 1, wherein each of the sorting rollers adjusts a gap between a lower end of an outer periphery of the roller body and an upper surface of the transport table. A sorting device comprising a mechanism. 5. The sorting device according to claim 1, wherein the roller body and the feed projection are made of aluminum. 6. The sorting device according to claim 1, wherein a plurality of the sorting rollers are driven by one drive source. 7. A sorting method in which a large number of objects to be sorted are supplied to a transport table to sort them by a plurality of sizes, wherein the transport table is inclined at a predetermined angle, and a length direction is provided above the transport table. A plurality of sorting rollers having a roller body having a constant outer diameter and a feed projection spirally formed at a required pitch on the outer periphery of the roller body are arranged, and the sorting roller is viewed in plan. The transfer table is disposed at a predetermined angle with respect to the sorting direction of the sorting object, and the gap between the lower end of the feed projection piece and the upper surface of the transfer table is sequentially narrowed from upstream to downstream. And
A sorting method, wherein the sorting roller is rotated while dropping the sorted objects on the transport table, and the sorted objects are sequentially sorted. 8. The sorting method according to claim 7, wherein the sorting is performed while water is being sprayed from an upstream side. 9. The sorting method according to claim 7, wherein the object to be sorted is sorted while the transfer table is vibrated. 10. The sorting method according to claim 7, wherein a lower end of the feed projection piece and an upper surface of the transport table are arranged in accordance with a size of the sorting object to be sorted. A sorting method, wherein a gap is set to 1 mm or more, and a height of the feeding projection piece from an outer periphery of the roller body is set to 2 mm or more.