JP4527579B2 - Waste plastic washing and dewatering equipment - Google Patents

Description

  The present invention relates to a waste plastic cleaning and dehydrating apparatus for removing foreign matter adhering to the surface of waste plastic (hereinafter simply referred to as “waste plastic”) and recycling the waste plastic with high quality.

  Various foreign substances adhere to the surface of the waste plastic. For example, in agriculture, residues of earth and sand and various fertilizers adhere to plastic sheets used for tunnel cultivation, and food and various seasoning residues adhere to plastics used in the food industry. Recycling waste plastics in this state makes it impossible to obtain high-quality recycled plastic, and for example, a proposal as disclosed in Patent Document 1 has been proposed.

Japanese Patent No. 3371397 (Patent 1)

  The proposal according to the above-mentioned Patent Document 1 is “a method of separating a material having viscoplasticity from a substance containing cellulose fiber as a material to be fiberized under mechanical stress by a dry method, and should be separated. In a method in which a material is subjected to a high degree of acceleration and impact forces so that the material flow of the fibrous material and the material flow of the viscoplastic material are taken out separately, the viscoelastic material and the mechanical stress The material to be fiberized exists essentially as a composite material, only the fibrous material is the force (this force is radial, axial and tangential with respect to the axis of rotation in the casing (1)) And is separated from the viscoplastic material, and the viscoplastic material is essentially not shredded in the material flow. In state It is those issued by "became as to Ri.

  Briefly explaining the above prior art, as shown in FIG. 5, a blade (stirring blade) 51 is rotated at a high speed in a cylindrical net 53 provided in a casing 52, and waste plastic to be treated is put into this. The foreign matter adhering to the waste plastic or the like is blown out of the cylindrical net 53 by centrifugal force without supplying the cleaning liquid (for example, water). 54 (blade 51 and waste plastic discharge port 56) is sent out of the apparatus 50.

  In the above prior art proposals, the foreign matter removal process proceeds in a dry manner, and the foreign matter is blown off to the outside of the polygonal cylindrical shape by centrifugal force. It is difficult to separate and remove the small one.

  As a countermeasure against such a problem, it may be possible to add a dehydration process before or after throwing waste plastic into the above-mentioned device to wash away the one attached to the surface of the waste plastic or one with a low specific gravity. However, this measure has problems such as an increased process and a dehydration step after cleaning.

  In view of the above-described problems of the prior art, the present invention provides a waste plastic cleaning and dehydrating apparatus in which a waste plastic cleaning process and a dewatering process are performed in a single flow, and foreign substances that have been washed off and blown off are discharged. The issue is to provide.

  In order to solve the above-mentioned problem, the present invention provides a rotating shaft between the end plates of the casing, a stirring blade is provided on the rotating shaft, a partition plate is attached in the middle of the rotating shaft, in the casing, and A net is arranged so as to surround the agitating blade, a waste plastic inlet is opened upstream of the casing, a treated waste plastic outlet is opened downstream, and the casing is charged from the upstream side of the casing. A nozzle for injecting cleaning liquid toward the waste plastic is provided, and a means for discharging the washed-out foreign matter is provided between the bottom surface of the casing and the net, and the stirring blade is a continuous spiral If necessary, a spiral rib that acts on the inner surface of the net to thrust the waste plastic introduced by the rotation of the stirring blades toward the discharge port. Is provided. Moreover, the outer diameter of the downstream stirring blade of the partition plate can be made larger than the outer diameter of the upstream stirring blade, and the inner dimensions of the net and the casing can be made to match these stirring blades.

  According to the present invention configured as described above, the waste plastic that has been introduced is in the front stage of the apparatus, while the cleaning liquid is sprayed and cleaned while being stirred, and foreign matter is blown off the outside of the net. In the latter part of the partition board, the water and the foreign substances washed off by the centrifugal force are blown off to the outside of the net, and the foreign substances are removed and dehydrated.

  Next, embodiments of the present invention will be described with reference to the drawings. The external appearance of each embodiment according to the present invention is basically as shown in FIG. 1, and both end plates 12a of the casing 12 supported by the frame F are provided with bearing bases B1. A bearing B is installed at B <b> 1, and a main shaft is provided in the casing 12.

  A waste plastic inlet 15 is opened on the upper right side of the casing 12, and a treated waste plastic outlet 16 that has been cleaned and dehydrated and a foreign matter outlet 17 that has been cleaned and removed are opened on the lower left side of the frame F. Is attached with a main motor M, and a belt V is stretched around a pulley P to transmit power to the main shaft.

  FIG. 2 is an explanatory diagram of the internal structure of the first embodiment. A waste plastic inlet 15 is opened at the upper upstream side of the casing 12, and a washed / dehydrated waste plastic outlet 16 is opened at the lower lower side to form a cylindrical shape. A foreign matter discharge screw 18 is provided between the lower side of the net 13 and the bottom surface of the casing 12, and a foreign matter discharge port 17 is opened downstream thereof. The cylindrical net 13 can be a polygonal cylindrical shape.

  A main shaft 19 is provided over the end plate 12a. A partition board 20 is attached to the middle of the main shaft 19, and a spiral blade 11a is integrally provided on the entire main shaft. A nozzle 21 for ejecting a cleaning liquid (for example, water) is provided at the position.

  In place of the spiral blade 11a provided on the main shaft 19, the blade (stirring blade) 11 can be intermittently disposed along a spiral orbit on the main shaft. Further, the intermittently disposed blade A fixed blade (not shown) can be disposed so as to sew the gap 11. However, it is necessary to prevent the rotating blade 11 and the fixed blade from interfering with each other. By providing such a rotating / fixing blade on the upstream side of the partition board, there is an increased chance that the waste plastic comes into contact with the cleaning liquid. Cleaning effect.

  In the first embodiment configured as described above, the upstream side becomes the cleaning region Y, the downstream side becomes the dewatering region Z, and the waste plastic put into the casing 12 is washed away by the foreign matter adhering to the surface while being cleaned upstream. In the downstream side of the partition board 20, the water in the washed waste plastic is dehydrated by the action of the centrifuge and discharged from the waste plastic discharge port 16, and is blown off to the outside of the cylindrical net 13 by centrifugal force. The discharged foreign matter is discharged from the foreign matter discharge port 17 by the discharge screw 18.

  FIG. 3 is an explanatory diagram of the internal structure of the second embodiment, and only differences from the first embodiment will be described. The outer diameter of the spiral blade 11a ′ in the dewatering region Z is larger than the outer diameter of the spiral blade 11a in the cleaning region Y, and the outer diameter of the cylindrical net 13 is changed accordingly.・ The internal dimensions are also changed on the bottom. As in the first embodiment, a polygonal cylindrical net is used instead of the cylindrical net 13, and the blades 11 are intermittently arranged on the spiral track instead of the spiral wing, or intermittently arranged. A fixed blade (not shown) may be provided so as not to interfere with the gap between the blades 11.

  By configuring in this way, in the cleaning region Y, the cleaning liquid is prevented from moving to the outside by centrifugal force, and the cleaning liquid stays longer in the waste plastic that has been input, and the cleaning effect is improved. The centrifugal force increases and the dehydration effect is exerted greatly.

  FIG. 4 is an explanatory diagram of the internal structure of the third embodiment. Since the basic structure is the same as that of the first embodiment, only the differences will be described.

  A main shaft 19 is provided over the end plate 12a. A partition board 20 is attached to the middle of the main shaft 19, and blades (stirring blades) 11 are intermittently provided on the entire main shaft. A nozzle 21 for ejecting a cleaning liquid (for example, water) is provided at any position.

  The blade 11 can be intermittently provided while drawing a spiral trajectory on the main shaft 19, and a fixed blade (not shown) is sewn so as to sew a gap between the intermittently provided blades 11. Can also be provided.

  Further, the bottom shape of the casing 12 that accommodates the foreign matter discharge screw 18 is a cylinder 18c whose upper portion is opened in the axial direction, so that the thrust of the foreign matter discharge screw 18 works sufficiently. Further, a spiral rib 22 can be provided on the inner surface of the cylindrical net 13 in order to assist the thrown-in waste plastic propelled downstream.

  In the third embodiment configured as described above, the waste plastic is agitated and cleaned in the upstream cleaning region Y, and is swung around by the blade 11 ′ in the downstream dewatering region Z past the partition board 20, Moisture in the washed waste plastic is dehydrated by the action of the centrifuge and discharged from the waste plastic discharge port 16, and foreign matter blown off to the outside of the cylindrical net 13 by centrifugal force has an upper portion in the axial direction. It falls into the opened cylinder 18 c and is efficiently discharged from the foreign matter discharge port 17 by the foreign matter discharge screw 18.

As described above, according to the present invention, the waste plastic put into the casing is washed with the cleaning liquid in the previous stage, and is mixed with the earth and sand adhering to the surface of the waste plastic, and the residue of food and seasoning stuck to It is washed off, blown out of the cylindrical net, and discharged by a screw.

  Further, at the latter stage of the casing, the washed waste plastic is swung by the blade and dehydrated by the action of the center separator to obtain a high-quality waste plastic recycled product, which has high industrial utility value.

(A) Front view of waste plastic cleaning dehydrator according to the present invention, (b) Side view of the same (A) Axial direction internal structure diagram of the first embodiment, (b) Anti-axial direction internal structure diagram (A) Axial internal structure diagram of the second embodiment, (b) Internal cross-axis direction internal structure diagram (A) Axial direction internal structure diagram of the third embodiment, (b) Anti-axial direction internal structure diagram (A) Axial internal structure diagram of conventional example, (b) Axial orthogonal direction internal structure diagram

Explanation of symbols

10, 50 Waste plastic washing and dewatering device 11, 51 Blade (stirring blade)
11a Spiral blades 12, 52 Casing 12a End plate 13, 53 Cylindrical nets 14, 54 Waste plastic discharge means 15 Waste plastic input port 16, 56 Waste plastic discharge port 17 Foreign material discharge port 18 Foreign material discharge screw 18c Cylinder 19 Main shaft 20 Partition plate 21 Nozzle 22 Rib B Bearing B1 Bearing base F Frame M Main motor P Pulley V Belt Y Cleaning area Z Dehydration area

Claims (5)

A rotating shaft is provided between the end plates (12a, 12a) of the casing (12), a stirring blade (11a) is provided on the rotating shaft, a partition plate (20) is attached in the middle of the rotating shaft, and the casing (12 ) And surrounding the agitating blade (11a), a net (13) is disposed, a waste plastic inlet (15) is opened upstream of the casing (12), and processing is performed downstream. A waste plastic outlet (16) is opened, and a nozzle (21) is provided on the upstream side of the partition (20) to inject cleaning liquid toward the waste plastic introduced from the upstream side of the casing (12). , between the bottom and the net (13) of the casing (12), a means for discharging washed out foreign matter provided, the cleaning liquid ejected from the nozzle (21) by said partition plate (20) By moving to the downstream side of the partition plate (20) is blocked, the upstream side and the washing zone of the washing liquid by waste plastic from the nozzle (21) (Y) of said partition plate (20), downstream A waste plastic cleaning / dehydrating apparatus characterized in that the side is a dewatering region (Z) for waste plastic that has been cleaned in the cleaning region (Y) . The waste plastic washing and dewatering device according to claim 1, wherein the stirring blade (11a) is disposed in a continuous spiral shape or intermittently on a spiral track. A spiral rib (22) is provided on the inner surface of the net (13), and thrust acts on the waste plastic introduced by the rotation of the stirring blade (11a) toward the discharge port (16). Waste plastic cleaning and dehydrating device as described in 1. The screw (18) is employed as means for discharging the washed-out foreign matter.
The waste plastic washing and dehydrating device according to any one of items 1 to 3. The outer diameter of the agitating blade (11a ′) on the downstream side of the partition board (20) is made larger than the outer diameter of the agitating blade (11a) on the upstream side , and the above-mentioned in accordance with these agitating blades (11a , 11a ′ ). By adopting the internal dimensions of the net (13) and the casing (12), the centrifugal force acting on the cleaning liquid in the cleaning region (Y) is relatively smaller than that in the dewatering region (Z), and the waste plastic is removed. The cleaning effect is enhanced, and the centrifugal force acting on the cleaning liquid in the dewatering region (Z) is relatively larger than that in the cleaning region (Y), thereby increasing the dehydrating effect of the cleaning liquid from the waste plastic. Item 4. A waste plastic cleaning and dehydrating device according to any one of Items 1 to 3.

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