JP2002316103A - Plastic piece cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently clean plastic pieces at a low cost. SOLUTION: The plastic piece cleaning apparatus is equipped with a cylindrical casing 1 arranged in a horizontal direction and having a charging port 2 of plastic pieces formed on one end side thereof and having a discharge port 4 on the other end side thereof, the stirring screw 18 arranged in the casing 1 in a freely rotatable manner, the on-off lid 6 arranged to the discharge port 4 in a freely openable and closable manner, a pressure means 7 having a weight 7b for energizing the on-off lid 6 in a closing direction to press the plastic pieces in the casing 1 and the pollutant discharge port 12 bored in the casing 1 to discharge the pollutant separated from the plastic pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry-type plastic piece washing apparatus arranged as a pretreatment device of a plastic sorting facility for sorting and separating plastics by type.

[0002]

2. Description of the Related Art When material recycling waste plastic, the history of plastic pieces to be separated and separated is
If impurities such as organic matter such as oils and fats, salts, and sugars, carbon components, and mud are attached, it is difficult to accurately separate them by a type separation device such as an electrostatic separation device. For this reason, a cleaning device is installed as a pretreatment for separating the types.

[0003] A wet cleaning apparatus for cleaning a plastic piece or the like is to put a plastic piece into a liquid such as water, stir and wash the plastic piece.

[0004]

However, a wet cleaning apparatus requires a large amount of cleaning water and a step of drying plastic pieces, and also requires post-processing equipment for the cleaning water. There has been a problem that operating costs are high.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a plastic piece cleaning apparatus capable of efficiently cleaning plastic pieces at low cost.

[0006]

According to a first aspect of the present invention, there is provided a horizontal cylinder having a plastic piece inlet at one end and a discharge port at the other end. A casing, a stirring member rotatably arranged in the casing, and a conveying means for applying a conveying force for feeding the plastic piece from the inlet to the outlet by the stirring member driven by gravity and / or rotation. A resistance member disposed at the discharge port to press and slide the plastic pieces by the conveying force of the conveying means, and a dust discharge perforated in the casing to discharge contaminant dust separated from the plastic pieces. And a hole.

[0007] According to the above construction, the plastic pieces introduced from the inlet are agitated by the stirring member so that the plastic pieces are rubbed together, and furthermore, the plastic pieces are retained by being pressed by the resistance member at the outlet. ,
Further, the plastic pieces are pressed and rubbed together. Thereby, the contaminants on the surface of the plastic piece are peeled off, and the dust is discharged from the dust discharge hole. Therefore, it is possible to effectively remove the contaminants attached to the plastic pieces, and it is not necessary to provide post-treatment equipment or a drying device for the washing water such as a wet washing device, and to reduce the size of the device and reduce the equipment cost and operating cost. Can be significantly reduced.

According to a second aspect of the present invention, in the configuration of the first aspect, the resistance member is constituted by a throttle member attached to a casing or a rotating shaft to narrow an outlet.

According to a third aspect of the present invention, in the configuration of the first aspect, the resistance member is constituted by a wing body for reverse feeding which is attached to a rotating shaft and applies a reverse conveying force to the plastic piece by rotation. Things.

According to the second or third aspect of the present invention, the plastic pieces are made to stay in front of the discharge port by the throttle member or the reverse feeding wing body, and are brought into sliding contact with each other by the pressing force. The surface can be effectively removed of contaminants.

According to a fourth aspect of the present invention, in the configuration of the first aspect, the resistance member is provided with an opening / closing lid which can be freely opened / closed at the outlet, and the opening / closing lid is urged in the closing direction to open the outlet. And a pressurizing device capable of adjusting the pressing force for pressurizing the plastic piece in the squeezing casing.

According to the above construction, the opening / closing lid is urged to close by the pressurizing device, and the plastic piece discharged from the casing to the discharge port is pressed at an appropriate pressure according to the properties of the plastic piece and the washing conditions. Pressing can more effectively clean the surface of the plastic piece.

According to a fifth aspect of the present invention, in the configuration of the first to fourth aspects, the stirring member is constituted by a rotating shaft and a plurality of stirring rods protruding from the rotating shaft in a radial direction. .

According to the above structure, the plastic pieces are strongly flipped off by the rotating stirring rod, and the plastic pieces collide with each other, whereby the contaminants adhered to the surface can be peeled off by the impact force. It can be washed.

According to a sixth aspect of the present invention, the stirring member is constituted by a stirring screw in which a plurality of conveying blades for applying a conveying force to a plastic piece are arranged at predetermined intervals, and the stirring member is provided between the conveying blades. Is formed as a stay space for compressing plastic pieces.

According to the above construction, the transport wings are cut off during the transport to form a stay space in which no transport force is applied to the plastic pieces. Therefore, the plastic pieces stay in the stay space to be blocked, and the block is formed. The converted plastic pieces and the conveyed plastic pieces rub against each other, so that contaminants adhering to the respective surfaces can be effectively removed.

According to a seventh aspect of the present invention, in the configuration according to the sixth aspect, a weir member for narrowing a transfer cross section in the casing is disposed in the stay space. According to the above configuration,
By reducing the cross section of the retaining space by the weir member, the pressure applied to the retained block-shaped plastic pieces can be further increased, and the plastic pieces can be effectively rubbed with each other. Can be washed well.

The invention according to claim 8 is the construction according to claim 6, wherein the holding space is smaller than the conveying force applied to the plastic pieces by the conveying wings and the conveying force is applied in the opposite direction. A wing is provided.

According to the above configuration, since the staying wings for applying the force in the direction opposite to the conveying force are provided, the plastic pieces are rubbed against each other with a sufficient pressure, and more effective cleaning can be performed. .

According to a ninth aspect of the present invention, in the configuration according to any one of the first to eighth aspects, the casing is formed in a cylindrical shape having a polygonal cross section of a triangle or more. According to the above configuration, the casing has a polygonal cross section, so that the plastic pieces stay in the corners, and the staying plastic pieces and the transporting plastic pieces are rubbed with each other, so that the cleaning power is further increased and the plastic pieces are increased. Contaminants on the surface of the piece are effectively removed.

According to a tenth aspect of the present invention, in the configuration according to any one of the first to ninth aspects, a plurality of uneven portions for promoting cleaning are formed on at least a part of the inner surface of the casing, the stirring blade, and the weir. Things.

According to the above construction, the agitating and friction of the plastic pieces are promoted by the uneven surface of the inner surface of the casing, the stirring blade and the weir, and the number of times of rubbing the plastic pieces is increased, so that the cleaning power is improved.

The invention according to claim 11 is the invention according to claims 1 to 10
In the configuration according to any one of the above, an inert gas supply means for supplying an inert gas into the casing, and the dust separated from the plastic pieces is discharged from the dust discharge hole formed in the casing together with the inert gas. Gas suction means having a dust suction line, a dust separation device for separating dust from the suctioned inert gas, and a circulation line for circulating the recovered inert gas to the inert gas supply means. Is provided.

According to the above construction, the inert gas is blown into the casing by the inert gas supply means, so that the contaminants due to frictional heat, such as the carbon powder peeled off, the ignition of the plastic pieces, or the contaminants. Dust explosion can be prevented beforehand. In addition, since the inert gas is sucked from the dust outlet of the casing, the dust of the contaminant separated from the plastic piece can be effectively removed from the plastic piece together with the dust. Further, the running cost can be reduced by the inert gas circulation means for returning the suctioned and recovered inert gas from the circulation line to the casing.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a plastic piece cleaning apparatus 10 according to the present invention will now be described with reference to FIGS.

A regular hexagonal cylindrical casing 1 arranged along the horizontal direction is provided with a charging port 2 for charging a plastic piece at one upper end thereof, and a charging hopper 3 with an opening / closing door 3a or a charging hopper 3 with a door 3a. A fixed amount supply device is attached, and a discharge port 4 whose lower part is inclined downward at the front end is formed at the other end.

An opening / closing lid (resistive member) 6 whose upper part is supported by a hinge 5 so as to be openable and closable is attached to the outlet 4, and a weight 7 b is attached to a shaft 7 a vertically provided on the opening / closing lid 6.
A pressurizing device (pressurizing means) 7 is provided so as to be position-adjustable and replaceable.
Can be urged in the closing direction to press the plastic piece that has reached the discharge port 4 in the casing 1, and the adhered substance can be effectively removed by rubbing to promote cleaning.

In the casing 1, a spiral conveying wing 8 for applying a propulsive force to the plastic piece on the rotating shaft 8a is provided.
Stirring screw (stirring member) 8 with b attached integrally
Are rotatably arranged around the axis of the casing 1. This stirring screw 8 is rotatably connected to an output shaft of a rotation drive device (electric motor) 9 while one end side shaft portion 8a is rotatably supported by an end plate 1a of the casing 1 via a bearing. You.

Further, on the inner surface of the casing 1 and the inner surface of the opening / closing lid 6, protrusions (irregular portions) for stirring are provided in order to promote the stirring of the plastic pieces and increase the number of times of rubbing.
As shown in FIGS. 11a and 11b and FIG. 4, a small mountain-shaped uneven portion 11d or a file-shaped uneven portion may be projected from the inner surface of the cylindrical casing 1 '. It can also be formed on the surface of the screw 8.
In the bottom of the casing 1, a number of dust discharge holes 12 for discharging dusty contaminants that have fallen due to rubbing of plastic pieces are formed. In addition, a bunching metal or a mesh plate having a large number of holes formed at regular intervals may be used for a part or the whole of the casing 1.
The casing can also be formed with strength by the reinforcing material.

The adjusting pressurizing device 7 using a weight is shown, but as shown in FIG.
The pressurizing lever 32 may be attached to the pin of the hinge 5 and the output rod of the pressurizing fluid pressure cylinder 33 may be connected to the pressurizing lever 32 so that the pressing force of the opening / closing lid 6 can be adjusted. FIG. 6 shows another adjusting pressurizing type pressurizing device 7B.
As shown in FIG. 7, the opening / closing lid 6 is disposed so as to be movable in parallel, the opening / closing lid 6 is urged toward the closing movement side by a pressing coil spring 34, and the pressing coil spring is pressed by a spring adjusting mechanism 35 such as an adjusting bolt / nut. A configuration may be adopted in which the pressing force of 34 is adjusted. Of course, a spring or the like for urging the pin of the hinge 5 to rotate in the closing direction can be attached.

As shown in FIG. 7, the adjusting pressurizing type pressurizing device 7 is omitted, and as shown in FIG. 7, a throttle portion (resistive member) 31 for gradually reducing the cross section of the other end of the casing 21 and squeezing it in a funnel shape is provided. By using a fixed pressure type, the plastic piece can be appropriately pressurized to increase the detergency.

As another fixed pressure type, as shown in FIG. 8, a conveying force in the opposite direction to the conveying wing 8b and smaller than the conveying wing 8b is applied to the tip of the rotating shaft 8a. A reverse transport wing body (resistance member) 36 provided to the plastic piece may be provided.

As another fixed pressure type, as shown in FIG. 9, a resistance plate (resistance member) 37 having a smaller diameter than the discharge port 4 is attached to the tip of the rotating shaft 8a, so that the discharge port 4 can pass through. The cross-section can be squeezed and the plastic piece can be moderately pressed to increase the cleaning power. Of course, the resistance plate 37 may be mounted as a cone valve 38 on the rotating shaft so as to be adjustable in position.

In the casing 1, dust adhering to the plastic pieces is rubbed against each other to easily generate static electricity and frictional heat, and the plastic pieces and separated dust-like contaminants due to the static electricity and frictional heat are sparked. For example, there is a risk of ignition combustion or dust explosion due to such factors. Particularly, carbon, which is easily ignited, is dangerous. Therefore, an inert gas supply device 13 is provided to prevent this. The inert gas supply device 13 is provided with a shaft 8 a of the stirring screw 8.
A gas distribution hole 13b is formed in the gas distribution hole 13b.
Are provided at predetermined intervals in the axial direction. Then, for example, a connection pipe 13e having an adjustment valve 13d from an inert gas cylinder 13c such as a nitrogen gas is connected to a coupling 13f mounted on a base end of the shaft 8a, and the coupling pipe 13e is connected to the coupling pipe 13f via a gas distribution hole 13b. The gas is supplied to the inert gas supply hole 13a. The inert gas supplied by the inert gas supply device 13 fills the inside of the casing 1 to prevent ignition and dust explosion, and discharges the dust along with the dust from a dust discharge hole 12 formed in the casing 1. It is configured as follows. That is, a dust suction cover 42 that covers the dust discharge holes 12 via a suction space 41 outside the casing 1, and a dust suction fan 44 that suctions an inert gas from an exhaust hole of the dust cover 42 through a suction duct (dust suction line) 43. A dust suction device 46 provided with a dust separation device 45 of, for example, a cyclone type, which is interposed in the suction duct 44 and separates dust from inert gas. Further, a gas circulation duct (circulation line) 47 for circulating and recycling the inert gas collected by the dust suction device 46 from the suction fan 44 to the connection pipe 13e is provided. The gas circulation duct 47 and the dust suction device 46 are provided. These constitute the inert gas circulation means 40. The adjusting valve 13d is operated by a detection value of a concentration sensor 48 for detecting a gas concentration of the gas circulation duct 47.

It is to be noted that an outer cylinder forming the suction space 41 may be provided to form a double-tube dust-absorbing cover. The cleaning device 10 having the above-described configuration is disposed in a plastic sorting facility shown in FIG. 3 for separating plastic pieces by type.

This plastic sorting equipment includes the above-described cleaning apparatus 10 for dry-cleaning the plastic pieces that have been roughly cleaned of the plastic raw material and pulverized and classified, and the friction charging apparatus 5 for friction-charging the washed plastic pieces.
1 and an electrostatic separation device 52 for separating charged plastic pieces by type. This electrostatic separation device 52 is formed by forming a plastic piece charged to a polarity and a charge amount of each type according to a charging sequence between a drum electrode 54 to which a high voltage is applied by a high voltage power supply device 53 and a counter electrode 55. Is supplied to the sorting electrostatic field 56, and the falling locus of the plastic pieces is changed by the action of electrostatic force to separate the plastic pieces into first to third separation trays 57A to 57C.

In the cleaning device 10, the plastic piece introduced into the casing 1 from the introduction hopper 3 via the introduction port 2 is stirred by the stirring screw 8 which is driven to rotate by the rotation driving device 9, and is discharged. The plastic pieces which are sent to the side 4 and accumulate in the corners of the casing 1 or retained by the stirring projections 11a and the plastic pieces transported by the transport wings 8b are rubbed against each other, and contaminants adhered to the surface. Peeled off,
The separated contaminants are collected by the dust suction device 46 into the dust discharge holes 1.
It is sucked and discharged from 2.

According to the above configuration, the plastic pieces are agitated in the casing 1 by the agitating screw 8 and pressurized by the opening / closing lid 6, so that the plastic pieces, the plastic piece and the inner surface of the casing 1, and the plastic piece and the agitating screw are mixed. By making sliding contact with 8, the contaminants adhering to the surface of the plastic piece can be effectively removed. In addition, the inert gas supplied from the inert gas supply means 13 into the casing 1 through the inert gas supply hole 13a of the shaft portion 8a causes static electricity and frictional heat of the plastic piece to remove the plastic piece and contaminants. Ignition, combustion and dust explosion are prevented. Further, the opening / closing lid 6 is urged in the closing direction by the pressurizing means,
Since the opening area of the discharge port 4 is narrowed and the plastic pieces are retained and pressurized in front of the discharge port 4, the plastic pieces are compacted and the plastic pieces rub against each other with an appropriate frictional force and adhere to the surface. The contaminants that have been removed are efficiently removed. If this frictional force is too large, the separated contaminants (dust) re-adhere to the surface of the plastic piece,
It has been confirmed by the present inventors that the cleaning state is reduced. Further, the inert gas in the casing 1 is sucked from the dust discharge port 21 by the dust removing device 46 and discharged together with the separated contaminant dust, thereby effectively separating the dust from the plastic pieces. it can. Furthermore, the inert gas circulating means 40 for returning the inert gas collected by the dust removing device 46 from the gas circulation duct 47 to the casing 1 can effectively use the inert gas and reduce the running cost.

FIGS. 10 and 11 show a second embodiment of the plastic piece cleaning apparatus. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The stirring screw 8 is rotatably arranged in a cylindrical casing 21, and a plurality of (two in the figure) transfer wings 8 c and 8 d are separated from each other on the shaft portion 8 a by a stagnation space 22. Installed. This stay space 22 has a shaft portion 8a
Plate that forms a throttle passage 23a around the periphery of the flow path to narrow the cross section of the flow path
(Weir member) 23 is mounted inside the casing 21, and by narrowing the flow path by the weir plate 23, the plastic pieces are pressed into the retaining space 22 to be blocked, and the blocked plastic pieces and the transport plastic pieces are separated from each other. Rubbing promotes cleaning. Further, a stirring projection (concavo-convex portion) 11c is provided on the front surface of the weir plate 23 so as to protrude.

The pressurizing means 24 connects the opening / closing lid 6 to the outlet 4
A guide member 24a composed of a rod and a guide shoe, which guides the door so that it can move close to and away from the door, and a hydraulic pressurizing cylinder (air cylinder) 24b for urging the opening / closing lid 6 toward the discharge port 4 are provided. The pressurizing means 24 is provided with a pressurizing control device 27 that detects the air pressure in the pressurizing chamber by the pressure sensor 25 and controls the adjusting valve 26, so that an appropriate pressing force is applied to the opening / closing lid 6. Thus, the cleaning state can be controlled well.

Further, instead of the inert gas supply means 13, a freezing gas of, for example, 0 ° C. or less capable of freezing a highly sticky contaminant is sprayed on the plastic piece, thereby easily removing the contaminant from the plastic piece. Is provided. In the frozen gas supply means 28, a gas distribution hole 28b is formed in the shaft portion 8a of the stirring screw 8, and a plurality of inert gas supply holes 28a communicating with the gas distribution hole 28b are provided at predetermined intervals in the axial direction. Has been drilled. A connection pipe 26e having an adjustment valve 26d is connected from a frozen gas gas cylinder 26c such as nitrogen gas to a coupling 26f mounted on the base end of the shaft 8a, and connected to the gas distribution hole 26b from the coupling 26e. Have been.

According to the above-described embodiment, a stagnant space 22 in which the transport wings 8c and 8d are removed is formed in the casing 21 other than the discharge port 4, and the squeezing passage 2 is formed in the stagnant space 22.
3a, the weir plate 23 is disposed.
With this, the feeding action of the plastic pieces is suppressed, the plastic pieces are retained and blocked, and the consolidation is performed for each of the retaining spaces 22 to amplify the rubbing action between the plastic pieces, thereby enabling more effective removal of contaminants.

Also, the viscous contaminants are frozen by a frozen gas supply means 28 for supplying a frozen gas into the casing 21 from the gas distribution hole 28b to the shaft 8a of the stirring screw 8, and the plastic pieces are separated from each other. Can be easily separated from the surface of the plastic piece. By cooling the plastic pieces and contaminants with the freezing gas, it is possible to prevent dust and ignition of the plastic pieces, explosion, and the like.

In the second embodiment, the stay space 22
The weir plate 23 is provided in FIG. 12, but as shown in FIG.
May be eliminated, and only the stagnation space 22 that does not apply the transfer force to the plastic pieces may be formed between the transfer wings 8e to 8h. Due to the reduced retention force of the plastic pieces due to the retention space 22, the decelerated plastic pieces and the transported plastic pieces are rubbed against each other, and can be more effectively cleaned.

As shown in FIGS. 13A and 13B,
Shaft 8a of stirring screw 8 corresponding to stagnation space 22
At this time, the staying wing 8j twisted in a direction opposite to the twisting direction of the conveying wing 8i is attached, and a force in the reverse direction smaller than the conveying force of the conveying wing 8i is applied to the plastic piece. It can effectively stay and rub the plastic pieces at high pressure to increase the cleaning action. Further, the weir plate 23 can be attached to the rotating shaft 8a, or the staying wing 8j can be attached to the inner surface of the casing 21.

FIG. 14 and FIG. 15 show a third embodiment of the plastic piece cleaning apparatus, in which a rotating shaft 31a is replaced with a rotating shaft 31a at a predetermined angle (in the figure, 90 degrees) in the radial direction instead of the transport wing 8b. The agitating blade 31 is constituted by a plurality of agitating rods 31b protruding from the stirrer. This stirring rod 31
b, a transfer inclined surface 31c for applying a transfer force to the plastic piece by rotation is formed. When the casing 21 is inclined so that the discharge port 4 is lower, the conveying force is applied by its own weight, so that the conveying inclined surface 31c can be unnecessary, and the conveying force by its own weight can be eliminated. When is small, the conveying force can be applied to the plastic piece in cooperation with the conveying inclined surface 31c.

In the third embodiment, the plastic is rubbed against each other with an appropriate pressing force in the previous embodiment, while the agitating rod 31 is used in this embodiment.
b is rotated at a relatively high speed, the plastic pieces are flipped off, and the plastic pieces collide with each other,
It removes contaminants attached to the surface of the plastic piece. The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

According to the above-described embodiment, since the rotating plastic rod 31b flips a plastic piece and collides it with another plastic piece for cleaning, contaminants are more effectively removed from the surface of the plastic piece. be able to.

[0049]

As described above, according to the first aspect of the present invention, the plastic pieces supplied from the charging port are agitated by the stirring member so that the plastic pieces are rubbed with each other, and the plastic pieces are added by the resistance member at the discharging port. When the plastic pieces are retained by being pressed, the plastic pieces are further pressed and rubbed together. Thereby, the contaminants on the surface of the plastic piece are peeled off, and the dust is discharged from the dust discharge hole. Therefore, contaminants attached to the plastic pieces can be effectively removed, and post-treatment equipment and a drying device for washing water such as a wet washing device are not required.
The equipment can be miniaturized, and the equipment cost and operation cost can be significantly reduced.

According to the second or third aspect of the present invention, the plastic pieces are made to stay in front of the discharge port by the throttle member or the back-feeding wing body, and are slid in contact with each other by the pressing force. The surface can be effectively removed of contaminants.

According to the fourth aspect of the present invention, the plastic piece discharged from the inside of the casing to the discharge port by urging the opening / closing lid to close by the pressurizing device is changed according to the properties of the plastic piece and the washing conditions. Pressing with an appropriate pressure can more effectively clean the surface of the plastic piece.

According to the fifth aspect of the present invention, the plastic pieces are strongly flipped off by the rotating stirring rod and the plastic pieces collide with each other, and the contaminants attached to the surface are peeled off by the impact force. Can be effectively cleaned.

According to the sixth aspect of the present invention, the conveying wing is cut off during the conveyance to form a staying space that does not apply a conveying force to the plastic pieces, so that the plastic pieces stay in the staying space and are blocked. The plastic pieces that have been formed into blocks and the plastic pieces to be conveyed rub against each other, and contaminants attached to the respective surfaces can be effectively removed.

According to the seventh aspect of the present invention, the stay space is narrowed by the weir member so that the cross section of the flow path is narrowed, so that the pressing force applied to the stayed block-shaped plastic piece is further increased, so that the plastic material is effectively reduced. The pieces can be rubbed together and the surface of the plastic piece can be cleaned well.

According to the eighth aspect of the present invention, since the staying wings for applying a force in the direction opposite to the conveying force are provided, the plastic pieces are rubbed against each other with a sufficient pressure, so that more effective cleaning is performed. Becomes possible.

According to the ninth aspect of the present invention, the casing has a polygonal cross section, so that the plastic pieces stay in the corners, and the staying plastic pieces and the transporting plastic pieces are rubbed against each other. The cleaning power is increased to effectively remove contaminants on the surface of the plastic pieces.

According to the tenth aspect of the present invention, the agitating and friction of the plastic pieces are promoted by the inner surface of the casing, the agitating blade, and the unevenness of the weir body, and the number of times of rubbing with each other is increased, so that the detergency is improved. You.

According to the eleventh aspect of the present invention, the inert gas is blown into the casing by the inert gas supply means, so that the carbon powder or the like, which has come off, is ignited by contaminants due to frictional heat, plastic pieces or the like. In addition, dust explosion due to contaminants can be prevented. In addition, since the inert gas is sucked from the dust outlet of the casing, the dust of the contaminant separated from the plastic piece can be effectively removed from the plastic piece together with the dust. Further, the running cost can be reduced by the inert gas circulation means for returning the suctioned and recovered inert gas from the circulation line to the casing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a plastic piece cleaning apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line AA shown in FIG.

FIG. 3 is a configuration diagram showing a plastic sorting facility provided with the plastic piece cleaning apparatus.

FIG. 4 is an AA sectional view showing another embodiment of the uneven portion.

FIG. 5 is a side sectional view showing a second embodiment of a resistance member and a pressure device of the plastic piece cleaning device.

FIG. 6 is a side sectional view showing a third embodiment of a resistance member and a pressure device of the plastic piece cleaning device.

FIG. 7 is a side sectional view showing a second embodiment of the resistance member of the plastic piece cleaning apparatus.

FIG. 8 is a side sectional view showing a third embodiment of the resistance member of the plastic piece cleaning apparatus.

FIG. 9 is a side sectional view showing a fourth embodiment of the resistance member of the plastic piece cleaning apparatus.

FIG. 10 shows a third embodiment of the plastic piece cleaning apparatus according to the present invention.
It is a longitudinal section showing an embodiment.

11 is a sectional view taken along the line BB shown in FIG.

FIG. 12 is a longitudinal sectional view of a main part showing a modification of the stirring screw of the plastic piece cleaning apparatus.

13 (a) and 13 (b) show modified examples of the stirring screw, wherein FIG. 13 (a) is a plan view and FIG. 13 (b) is a transverse sectional view.

FIG. 14 is a third view of the plastic piece cleaning apparatus according to the present invention.
It is a longitudinal section showing an embodiment.

FIG. 15 is a sectional view taken along the line CC shown in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Inlet 4 Discharge port 6 Opening / closing lid 7 Pressurizing means 7b Weight 8 Stirring screw 8a Rotating shaft 8b Transfer wing 8c Transfer wing 8d Stay wing 9 Rotary drive 10 Cleaning devices 11a, 11b, 11c Projection 12 Dust discharge hole 13 Inert gas supply means 13a Inert gas supply hole 21 Casing 22 Retention space 23 Weir plate 23a Restrictor passage 24 Pressurizing means 24b Pressurizing cylinder 28 Refrigerated gas supplying means 28a Inert gas supplying hole 40 Non Active gas circulation means 42 Dust suction cover 43 Suction duct 44 Dust suction fan 45 Dust separation device 46 Dust suction device 47 Gas circulation duct

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Carpenter 1-7-89 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Shogo Hamada 1-chome Minami-Kohoku, Suminoe-ku, Osaka-shi, Osaka No. 7-89 Hitachi Zosen Corporation (72) Inventor Tetsuya Inoue 7-89 Inside Hitachi Zosen Corporation (72) Inventor Masanori Tsukahara Minami Kohoku, Suminoe-ku, Osaka-shi 1-7-89 Hitachi Zosen Corporation F-term (reference) 3B116 AA46 AB16 BA01 BA12 BB82 4D021 AA01 AB01 CA01 CB02 DA13 EA10 4D031 AC04 DA05

Claims (11)

[Claims] 1. A horizontal tubular casing having a plastic piece input port formed at one end and a discharge port formed at the other end, a stirring member rotatably disposed in the casing, Conveying means for applying a conveying force for feeding the plastic piece from the input port to the discharge port by the agitating member driven by gravity and / or rotation; and a plastic piece arranged at the discharge port, the plastic piece being transferred by the conveying force of the conveying means. A plastic piece cleaning device, comprising: a resistance member that is brought into sliding contact by pressing; and a dust discharge hole that is provided in the casing and discharges contaminant dust separated from the plastic piece. 2. The plastic piece cleaning apparatus according to claim 1, wherein the resistance member is constituted by a throttle member attached to the casing or the rotating shaft to narrow an outlet. 3. A plastic strip cleaning apparatus according to claim 1, wherein said resistance member is constituted by a wing for reverse feeding which is attached to a rotating shaft and applies a reverse conveying force to said plastic strip by rotation. . 4. An opening / closing lid which is disposed at a discharge port so as to be openable and closable at a discharge port, and a pressure adjusting means for urging the open / close lid in a closing direction to narrow the discharge port and pressurize a plastic piece in a casing. And a pressure device.
A plastic strip cleaning device as described. 5. The plastic piece cleaning device according to claim 1, wherein the stirring member comprises a rotating shaft and a plurality of stirring rods protruding from the rotating shaft in a radial direction. apparatus. 6. A stirring member comprising a stirring screw in which a plurality of conveying wings for imparting a conveying force to a plastic piece are arranged at predetermined intervals, and a space between the conveying wings is formed by a plastic piece. The plastic piece cleaning apparatus according to any one of claims 1 to 5, wherein the plastic piece cleaning apparatus is configured as a compression space. 7. A plastic piece cleaning apparatus according to claim 6, wherein a weir member for narrowing a transfer cross section in the casing is disposed in the stay space. 8. A staying wing for providing a conveying force in a direction opposite to a conveying force applied to a plastic piece by a conveying wing body in a retaining space. Plastic strip cleaning equipment. 9. The plastic piece cleaning apparatus according to claim 1, wherein the casing is formed in a cylindrical shape having a polygonal cross section of a triangle or more. 10. A plastic piece cleaning apparatus according to claim 1, wherein a plurality of uneven portions for promoting cleaning are formed on at least a part of the inner surface of the casing, the stirring blade, and the weir. . 11. An inert gas supply means for supplying an inert gas into the casing, and a dust suction line for discharging dust separated from the plastic pieces through a dust discharge hole formed in the casing together with the inert gas. And a dust separating device having a dust separating device for separating dust from the sucked inert gas, and an inert gas circulating means comprising a circulating line for circulating the collected inert gas to the inert gas supplying means. The plastic piece cleaning apparatus according to any one of claims 1 to 10, wherein: