JP2003112121A - Trommel and method for separating waste by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trommel made proof against clogging of sieve openings by tapes by a simple structure and to provide a method for separating wastes by using the trommel. SOLUTION: The trommel is the one that sieves the wastes introduced into the hollow of a rotary drum by many sieve openings piercing the peripheral wall and has a scraper that removes tapes contained in the wastes and clogging the sieve openings on passing. The trommel may be the above one wherein the scraper has a comb-like scraping member with scraping pieces arranged in the direction of the axis of the rotary drum, scraping the tapes, and confronting the sieve openings at their tips.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rotary sieve (trommel).
) And a method of sorting waste using a rotary sieve, and more specifically, a rotary sieve that is installed in a recycling treatment facility or the like and is sorted into the size of the waste to be treated and carried into the facility, and The present invention relates to a method of sorting wastes using a rotary sieve.

[0002]

2. Description of the Related Art Generally, recyclable industrial waste discharged from production factories or general household waste is collected in a recycling facility and installed in the facility after unpacking. It is sorted and processed according to the material and the size of the shape by various sorters. An equipment configuration diagram of this type of recycling processing facility is schematically shown in FIG. In FIG. 4, Pf is a platform, Pi is a dust pit, Cr is a crane, De is a bag breaking machine, and Ti is a swing sorting machine. Pl and Fi are plastic bottle and film wind sorters, Ma is a magnetic sorter, Pl2 is a second plastic bottle sorter that sorts plastic bottles by material, and Co is a plurality of belt conveyors for manual sorting.

The waste accumulated in the pit Pi is conveyed to the bag breaking machine De by the crane Cr, and the waste mixed with various kinds of wastes after unpacking is thrown into the rocking sorter Ti.
With respect to the waste put in the rocking sorter Ti, light film-based dust is pushed up to the ascending portion by rocking, and slightly heavy bottle-based dust remains in the lower layer. Further, due to stirring accompanied by rocking, metal fittings such as a small and heavy resin or metal cap (referred to as a small diameter system) having a small volume are sewn in the gap of dust and fall from the middle. In this way, the waste plastics carried into the processing facility are roughly classified into three series such as the above film series by the rocking sorter Ti. Then, as shown in the lower part of FIG. 4, the bottle system and the like separated from the irons are packed in a compression packing machine, and transported to the next regenerating process corresponding to each by a transport vehicle or the like.

In this case, small-diameter products and residues may still be mixed in the waste plastics such as bottles and films that have been sorted by the swing sorting machine Ti. If a small-diameter product system such as a metal cap is mixed in the selected bottle system, problems often occur in the subsequent processing steps. Therefore, it is necessary to remove these small diameter systems before the next regenerating step, that is, in the middle of the waste conveying route in each sorting step as shown in FIG. In particular, if the small-diameter product as described above is removed before the processing of the sorting apparatus such as the swing sorting machine, the load of the sorting operation of the swing sorting machine or the like can be reduced.

On the other hand, various sorters have been conventionally proposed for sorting the size of waste. The above-mentioned rotary sieve called "Trommel" also has sieve meshes consisting of a large number of through holes penetrating inside and outside the peripheral wall of the rotating cylinder, and round and square rods in the axial and circumferential directions are arranged in a grid pattern. It has been widely used that it is assembled to a large number of sieve meshes on the circumference (for example, JP-A-7-136589). In both rotary screens, the size of the shape can be mechanically separated based on the size of the mesh passing through the peripheral wall as a reference and the success or failure of the mesh permeation accompanying the rotation of the waste thrown into the hollow part. ing.

[0006]

In recent years, the following problems have become apparent with the progress in recycling plastic general waste (hereinafter referred to as plastic waste) among general waste. It was That is, small stones, concrete debris (small pieces), and small pieces of waste wood mixed in the plastic waste can be relatively smoothly and effectively selected by the installed rotary sieve. However, when video tapes and sheet-shaped plastics (hereinafter referred to as tapes) that are long like a cord are mixed in the waste, these tapes are caught in the sieve of the rotary sieve and the sieve mesh There are many things that are blocked. If the sieve mesh of the rotary sieve is blocked, even if small waste reaches the sieve mesh, the permeation is blocked. For this reason, there has been a fatal problem that the original screening function of the rotary screen is lost and the processing capacity of the entire recycling processing facility is reduced.

The present invention has been made in order to solve the above-mentioned conventional problems, and has a simple structure and is capable of preventing clogging of sieve mesh due to tape-like waste and a rotary sieve and a rotary sieve. It is an object of the present invention to provide a waste sorting method using a sieve.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a rotary sieve in which a waste charged in the hollow portion of a rotary drum is sieved by a large number of sieve meshes penetrating the peripheral wall and mixed in the waste. The rotary sieve is provided with a scraping unit that removes tapes that are blocked by passing through the sieve mesh. Further, in the above, the rotary sieve is provided with a comb-shaped scraping member which is arranged in the axial direction of the rotary drum and has the tips of the scraping scrapes for scraping tapes facing the sieve mesh. Furthermore, the present invention mixes the waste mixed with various kinds of waste into the hollow drum of the rotary drum provided with a large number of sieve openings penetrating the inside and outside of the peripheral wall and the waste thrown into the rotary drum. The tapes that have passed through the sieve mesh are pulled out to the outer peripheral surface side of the rotating drum and locked by the facing scraping member, and the tapes locked by the scraping member are attached to the rotating drum. This is a method of selecting a waste using a rotary sieve, which has a removal step of removing by extracting or cutting to the outer peripheral surface side by rotation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a perspective explanatory view showing a configuration of a first embodiment of the present invention,
FIG. 2 is an explanatory view showing a partially enlarged operation of the first embodiment. In FIGS. 1 and 2, 1 is a rotary sieve, and 2 is a main body of the rotary sieve 1. 3 is a rotary drum in the main body 2,
4 is a backing plate. Reference numeral 30 is a hollow portion of the main body 2, 31 is a friction ring provided in front of and behind the rotary drum 3 (left and right in the drawing), 32
Is a sieve mesh. On the peripheral wall of the rotating drum 3, as shown,
A large number of circular sieve meshes 32 are provided penetrating the inside and outside of the peripheral wall at intersections of the axial direction and the radial direction at regular intervals.
Reference numerals 41 and 42 denote a pair of front and rear drive rollers and a floating roller, respectively, and 43 denotes a drive shaft for driving the drive roller 41.

Although not shown in detail, both the front and rear drive rollers 41 and the idler roller 42 are rotatably supported by a mount provided in the peripheral portion of the rotary drum 3, and each pair of front and rear roller surfaces. It is in contact with the friction ring 31. Similarly, the left and right drive shafts 43 are also connected to the output shaft of a drive motor (not shown) so that each drive roller 41 transmits synchronous rotational torque from the left and right to the lower portion of the rotary drum 3, and four drive rollers are provided. The floating roller 42 rotatably supports the upper portion of the rotary drum 3 at two places on the left and right. The receiving plate 4 is formed in a gutter shape and is provided below the main body 2.

Reference numeral 5 is a scraping member. In the first embodiment, the scraping member 5 is a plate-shaped connecting portion 51 arranged in the axial direction on the outer periphery of the rotary drum 3 as shown in the figure, and the plate-shaped connecting portion 5
It is formed in a comb shape having a plurality of scraping pieces 52 protruding from 1 in a rod shape. The plurality of scraping pieces 52 are provided in the lower portion of the connecting portion 51 at substantially equal intervals, and the tips of the scraping pieces 52 are opposed to the sieve meshes 32 formed at intervals in the radial direction of the peripheral wall of the rotary drum 3 described above. ing. And the body 2 of the drum
Is given a downward slope toward the front on the left side of the figure.
It is installed downstream of e via a conveyor Co. O-
Reference numeral O denotes a rotary shaft of the rotary drum 3, and reference numeral 60 denotes tapes mixed in the waste (FIG. 2).

The operation of the rotary sieve having the above-mentioned structure is shown in FIG.
Will be described with reference to FIG. When the drive shaft 43 is rotated counterclockwise by the rotational force of the drive motor (not shown), the rotary drum 3 rotates in the arrow direction about the rotary shaft O-O. On the other hand, the waste in which various waste materials such as films and bottles are mixed is indicated by a white arrow, and the rotary drum 3
Is charged into the hollow portion 30 from the upstream side. Initially, the rotation of the rotary drum 3 causes the sieving function of the rotary sieve 1 to act, so that a small-diameter object such as a metal cap mixed with the waste is sieve mesh 32.
And falls on the receiving plate 4. The other large material mixed in the waste remains in the hollow portion 30, and is conveyed along the inclination of the rotary drum 3 as it is in the downstream direction on the left side of FIG. 1 and sieved.

However, if string-like plastics such as video tapes or sheet-like plastics are mixed in the waste, as described above, the end portions of these tapes or the middle thereof rotate and rotate. When the drum 3 is agitated, it penetrates through the through holes of the sieve mesh 32 and is exposed to the outside. And
The exposed tapes are caught on the sieve mesh 32 to close the gap, and if the processing operation is continued as it is, the penetration of the sieve mesh 32 of the small diameter object will be hindered. On the other hand, in the first embodiment of the present invention, the comb-shaped scraping member 5 having the plurality of scraping pieces 52 in the axial direction of the outer circumference of the rotary drum 3 is provided. A plurality of scraping pieces 52 on the scraping member 5
Have their ends close to the sieve meshes 32 of the rotary drum 3 and face each other.

Therefore, when the tapes are exposed and caught from the sieve meshes 32 as described above, a part of the tapes exposed on the outer periphery is rotated integrally with the rotary drum 3 to the position of the scraping member 5. When reaching, the scraping piece 52 is entangled. As a result, the tapes that rotate while being entangled with the scraping piece 52 that is stopped are automatically removed as they are. The state at this time is shown in a partially enlarged view of FIG. In this way, the scraping member 5 maintains the open state of the sieve mesh 32, and the operation of sieving the waste by the rotary sieve 1 is continuously performed.

Second Embodiment FIG. 3 is an explanatory diagram showing the configuration of the second embodiment of the present invention. In the second embodiment, as shown in the figure, the scraping member 5 is of a rotary type that rotates around the scraping shaft 53. Further, three rows of scraping pieces 52 are provided around the scraping shaft 53, and each scraping piece 52 is clickably and sequentially locked at a position facing the sieve mesh 32 to be switchable. In the second embodiment as well, the tapes caught on the sieve mesh 32 are removed by the scraping piece 52 by the same operation as in the first embodiment. According to the second embodiment, the sieving work and the removal of the tapes can be carried out independently, so that the work efficiency can be expected to be improved.

In the first embodiment described above, a case where a large number of sieve meshes are provided at the intersections of the rotary drum in the axial direction and the radial direction and the scraping pieces of the scraping member are opposed to these sieve meshes is illustrated. As described above, the present invention may be applied to a rotary drum having sieve meshes provided at irregular positions, and can also be applied to a basket-type rotary sieve. Further, although the scraping piece has been illustrated and described as a straight one, it may be formed in a hook shape that is curved in the rotation direction, and a rough surface may be formed near the tip so that tapes are easily entangled. it can.

[0017]

According to the rotary sieve of the present invention and the waste sorting method using the rotary sieve described above, the following remarkable effects can be obtained. (1) With a simple structure in which a comb-shaped scraping member is provided close to the outer periphery of the rotary drum, clogging of the mesh of the rotary sieve with tapes is prevented, and other waste materials such as small diameter materials are prevented. It will not hinder the selection. (2) In the rotary sieve that selects the size of the waste,
The mixed tapes can be independently sorted and collected from other wastes. (3) Since the sorting work of the waste material using the rotary sieve is stable for a long time, the conventional trouble handling work is eliminated, and the work of monitoring the clogging of the sieve mesh with tapes and the clogged tapes are eliminated. The repair time associated with the removal work of the waste is reduced, and the sorting efficiency of all wastes can be improved and the sorting cost can be reduced.

Therefore, according to the present invention, it is possible to provide a rotary sieve which has a simple structure and prevents clogging of the sieve mesh due to tapes, and a method of sorting wastes using the rotary sieve.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing the operation of the first embodiment in a partially enlarged manner.

FIG. 3 is an explanatory diagram showing a configuration of a second embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a recycling processing facility.

[Explanation of symbols]

1 rotary sieve 2 Rotating sieve body 3 rotating drums 4 Support plate 5 Scraping member (scraping part) 30 hollow 31 Friction ring 32 sieve mesh 41 drive roller 42 Floating roller 43 Drive shaft 51 Connection 52 scraping piece 53 scraping shaft 60 tapes

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidetoshi Noda             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Takuro Nomura             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Minoru Takuwa             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Sakae Yamamoto             7-3 Benten-cho, Tsurumi-ku, Yokohama-shi, Kanagawa             Nukekei Plant Construction Co., Ltd. (72) Inventor Yukio Toyoda             1-3, Bentencho, Tsurumi-ku, Yokohama-shi, Kanagawa             Nuke Environment Co., Ltd. F-term (reference) 4D021 AA15 AB01 CA11 DA13 DB12                       EA10

Claims (3)

[Claims] 1. A rotary sieve for sieving a waste material charged into a hollow portion of a rotary drum by a large number of sieve meshes penetrating the peripheral wall, wherein the waste material is mixed with the waste material and permeates through the sieve mesh. A rotary sieve having a scraping unit for removing tapes to be blocked. 2. A comb-shaped scraping member is provided in the scraping section, which is arranged in an axial direction of a rotary drum and has a tip of a scraping piece for scraping off the tapes and the like facing the sieve mesh. The rotary sieve according to claim 1. 3. A throwing step of throwing waste mixed with various kinds of dust into a hollow portion of a rotary drum provided with a large number of sieve openings penetrating inside and outside of a peripheral wall, and a waste throwing into the rotary drum. The mixed tape passes through the sieve mesh and is pulled out to the outer peripheral surface side of the rotating drum to be locked by the facing scraping member, and the tapes locked by the scraping member are described above. A method of selecting wastes using a rotary sieve, comprising: a removal step of removing by extracting or cutting the outer peripheral surface side by rotation of a rotating drum.