KR20210133929A - Electrostatic separator for manufacturing recycled pallet of waste plastic - Google Patents

Abstract

Disclosed is an electrostatic separator for manufacturing recycled pallets of waste plastic. According to the present invention, an electrostatic separator that separates waste plastic materials by an electrostatic effect comprises: a positively charged first drum and a negatively charged second drum; and a surface removal part circumscribed on the surface of each of the first drum or the second drum and formed vertically to be opposite to the direction of rotation of the first drum or the second drum. Accordingly, it is possible to manufacture pellets for regenerating or recycling waste plastics, perform electrostatic separation through the friction of each material from waste plastics mixed with plastic materials ABS, PS, and PP, improve the recovery rate of ABS and PS, and remarkably reduce the defective rate for sorting by performing separation by electrostatic charge and magnetic separation on plated plastic materials.

Description

Electrostatic separator for manufacturing recycled pallet of waste plastic

Disclosed content relates to an electrostatic separator for manufacturing waste plastic recycling pallets, and more particularly, to an electrostatic separator for manufacturing waste plastic recycling pallets, in which the crushed material is transported using a conveyor belt after pulverization of the waste plastics. .

Unless otherwise indicated herein, the material described in this section is not prior art to the claims of this application, and inclusion in this section is not an admission that it is prior art.

Plastics appeared as substitutes for metal, wood, glass, ceramics, and leather in the early days, but they have lightness, toughness, corrosion resistance, colorability, and the possibility of mass production. , architecture, and other fields

As an indispensable material, it has firmly established itself as a new material rather than a substitute.

Plastic is a material that can be molded by heating, pressurization, or these two methods, or a general term for molded products using these materials.

Plastics are used in various fields due to their ease of molding, but the problem of disposal of waste plastics that are used and discarded is serious as there are many fields of application.

With the rapid industrial development, Korea began to take an interest in and legally respond to plastic waste, which was established in 1980 with the establishment of the "Synthetic Resin Waste Treatment Business Act" in 1980. At the end of 1992, the "Resource Conservation and Recycling Promotion Act" was enacted, and by the Prime Minister's Ordinance in 1993, the "Act on Standards for Packaging Methods and Materials of Products, etc.", etc., are trying to reduce the source of generation.

The amount of waste plastic generated is a function of the actual domestic demand, but it is not so simple because the period of use or recovery is different for each item and use of each plastic.

According to the statistics of 'National Waste Generation and Treatment Status (Ministry of Environment, 1997)', 88.1% of total waste plastics generated in 1996 were landfilled and 10.6% incinerated, and only the remaining 1.4% was recycled. It is still in an insignificant state.

In addition, plastic waste generated from industrial waste, including household waste, has caused serious problems in its treatment. Although plastic waste is primarily separated and collected, it is almost impossible to properly recycle it. Plastic wastes primarily separated and collected are generally about 70% plastic, 20% paper, and 10% wood or other impurities. These plastic wastes have been landfilled by selecting a landfill site so far.

However, these days, it is difficult to select such a landfill, and even if a landfill site is found and reclaimed, there is a problem that causes environmental problems including various water pollution.

Korean Patent Registration No. 10-0566065 discloses "recycled plastic pellets using waste plastic and a method for manufacturing the same".

The prior art removes the dirt of the waste synthetic resin by using a wet washing method, and after completely removing moisture through a dehydration process, it is transported to the pellet manufacturing apparatus.

In the process of transporting, an electrostatic separator is used to classify the charged plastic debris into positive, negative and non-charged ones, respectively.

In addition, the wet process alone cannot completely classify materials with similar specific gravity, resulting in lower purity. In order to improve this, it is possible to classify with high purity by applying an electrostatic separation process before the pellet manufacturing process.

Accordingly, the electrostatic separator is provided with a first drum having a positive charge and a second drum having a negative charge, respectively.

However, in the prior art, when these drums are used for a long period of time, fine powders are adhered to the surface to form a layer, which causes a problem in that the electric charge power is lowered and the positive and negative charge separation and selection power is lowered.

Therefore, the surface of each drum was cleaned with a brush, but the cleaning was not performed properly due to the friction of the brush itself, so there was a problem that the electrostatic efficiency was lowered.

Disclosed is an electrostatic separator that produces pellets for recycling or recycling waste plastics, but separates the waste plastic shreds mixed with ABS, PS, and PP, which are plastic materials, into positive and negative shreds by electric charge, but each of the electrostatic separators An object of the present invention is to provide an electrostatic separator for manufacturing waste plastic recycling pallets that can clean the surface of a drum to prevent a decrease in electrostatic efficiency due to adhesions.

The purpose of the example is to

In the electrostatic separator for separating waste plastic material by electrostatic effect,

a first drum having a positive charge and a second drum having a negative charge;

By an electrostatic separator for manufacturing waste plastic recycling pallets comprising a; a surface removal part circumscribed on the surface of each of the first drum or the second drum, the surface removing part being formed perpendicular to the rotation direction of the first drum or the second drum can be achieved.

According to one embodiment, the first drum or the second drum is disposed on both sides of the drum so as to be rotatable, a bearing housing coupled to the first drum or the second drum axially is formed, and the surface removal unit is mounted on the base ;

According to an embodiment, a charge applying unit for applying an electric charge to each of the first drum or the second drum;

According to one embodiment, a driving unit connected to rotate each of the first drum or the second drum; characterized in that it comprises a.

According to one embodiment, the surface removal unit is formed with a sharp blade at the tip in contact with the surface of the drum, and a plate-shaped knife body vertically mounted on the upper surface of the base; characterized in that it comprises a.

According to an embodiment, a partition wall formed perpendicular to the lower portion between the first drum or the second drum and collecting a material having no charge passing between the first drum or the second drum; do it with

According to an embodiment, the dividing wall includes a first divider formed under the first drum and a second divider formed under the second drum, and the first divider is a virtual image drawn from the center of the first drum. It is characterized in that it is vertically formed so as to be tangential to the lower part of the horizontal line corresponding to 0° in the crosshair of the .

According to an embodiment, the second separator is vertically formed so as to be tangential to the lower part of the horizontal line corresponding to 180° in the virtual crosshair drawn from the center of the second drum.

According to an embodiment, a discharge space is formed between the first separator and the second separator, and a plastic material having no charge is transferred through the discharge space.

According to an embodiment, the driving unit includes a motor and a belt rotated by the driving of the motor, and is connected to the sprockets formed on the shafts of the first and second drums by the belt.

According to the disclosed embodiment, an electrostatic separator for producing pellets for recycling or recycling waste plastics, but separating waste plastic shreds mixed with plastic materials ABS, PS, PP into positive and negative shreds by electric charge, but electrostatic separator It has the effect of preventing the degradation of electrostatic efficiency due to the adhesion by cleaning the surface of each drum.

1 is a perspective view showing an electrostatic separator for manufacturing a recycling pallet of waste plastics according to an embodiment;
2 is a front view showing an electrostatic separator for manufacturing a recycling pallet of waste plastics according to an embodiment;
3 is a partially enlarged perspective view showing an electrostatic separator for manufacturing a recycling pallet of waste plastics according to an embodiment;
4 is a front view illustrating an example in which surface cleaning is performed by a surface removal unit while each drum of the electrostatic separator in FIG. 3 is rotated;

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

The embodiments to be described below are intended to describe in detail enough to be easily practiced by those of ordinary skill in the art to which the present invention pertains, thereby limiting the technical spirit and scope of the present invention. doesn't mean

In addition, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and the terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. It should be noted that definitions of these terms should be made based on the content throughout this specification.

Among the accompanying drawings, FIG. 1 is a perspective view showing an electrostatic separator for manufacturing recycling pallets of waste plastics according to an embodiment, FIG. 2 is a front view showing an electrostatic separator for manufacturing recycling pallets of waste plastics according to an embodiment, and FIG. 3 is an embodiment A partially enlarged perspective view showing an electrostatic separator for manufacturing waste plastic recycling pallets, FIG. 4 is a front view showing an example in which surface cleaning is performed by a surface removal unit while each drum of the electrostatic separator in FIG. 3 rotates.

The electrostatic separator for manufacturing waste plastic recycling pallets separates waste plastic materials by electrostatic effect.

1 to 3, the electrostatic separator for manufacturing recycled pallets of waste plastics according to the embodiment,

The housing 100 having a receiving space 120 formed therein and an outlet 140 formed therein;

a first drum 200 and a negatively charged second drum 200b mounted on the upper portion of the inner outlet 140 of the housing 100 and having a positive charge;

A surface removal unit 400 circumscribed on the surface of each of the first drum 200 or the second drum 200b and formed perpendicular to the rotation direction of the first drum 200 or the second drum 200b ); consists of

The base 160 is formed on both sides of each drum so that the first drum 200 or the second drum 200b is rotatable.

Each shaft of the first drum 200 or the second drum 200b is coupled to a bearing housing (not shown) provided on the base 160 .

A charge applying unit 74 for applying an electric charge to each of the first drum 200 or the second drum 200b is included.

It also includes a; driving unit 180 connected to rotate each of the first drum 200 or the second drum 200b.

The driving unit 180 includes a motor and a belt rotated by the driving of the motor, and is connected to a sprocket formed on the shaft of the first drum 200 or the second drum 200b by the belt.

The surface removal unit 400 is a plate-shaped blade 420 is formed with a sharp tip in contact with the surface of each of the first drum 200 or the second drum 200b, and is vertically mounted on the upper surface of the base 160 . of the knife body 440; includes.

On the other hand, the separation is formed perpendicular to the lower portion between the first drum 200 or the second drum 200b, and collects the material having no charge passing between the first drum 200 or the second drum 200b. wall 600;

The partition wall 600 includes a first separator 610 formed under the first drum 200 and a second separator 620 formed under the second drum 200b.

The first separator 610 is vertically formed so as to be tangential to the lower portion of the horizontal line corresponding to 0° in the virtual crosshair drawn from the center of the first drum 200 .

The second separator 620 is vertically formed so as to be tangential to the lower portion of the horizontal line corresponding to 180° in the imaginary cross line drawn from the center of the second drum 200b.

A discharge space 640 is formed between the first separator 610 and the second separator 620 , and a plastic material having no charge may be transferred through the discharge space 640 .

The waste plastic material is pulverized plastic waste, has a size of about 30×30 mm or less, and is washed with water while passing through a washing unit (not shown) during transport.

The washing unit dehydrates the waste plastic material introduced from the hopper by spraying high-pressure water from the outside as it passes through the conveyor belt.

Afterwards, the washed waste plastic material passes through the hot air fan of the heating unit 5 while being transported on the conveyor belt so that moisture is dried.

In the process of transporting in this way, the waste plastic material is already mixed and transported in the state of being first crushed, so small plastic powders are stuck to the surface by static electricity during the transport process.

A plurality of electrostatic separators are disposed so that one to several electrostatic separation operations can be performed, and as the number of electrostatic separation increases, the separation yield can be improved.

The first drum 200 and the second drum 200b are arranged at the same height and spaced apart from each other at regular intervals.

Since a positive charge is applied to the first drum 200 and a negative charge is applied to the second drum 200b, the materials each having a negative charge on the outer surface will be attached to the first drum 200, and the material having a positive charge is the second drum 200b. They can be attached to the drum so they can be separated from each other.

In addition, the non-charged plastic material is discharged through the discharge space 640 between the separation walls 600 while falling between the first drum 200 and the second drum 200b.

Each of the first drum 200 or the second drum 200b is provided with a surface removal unit 400 to circumscribe the outer circumferential surface, so that the surface removal unit 400 is formed on the first drum 200 or the second drum ( 200b) The material attached to each surface is scraped off and removed.

After the waste plastic material is always attached to the surface of each of the first drum 200 or the second drum 200b, which is charged, it is scraped off by the surface removal unit 400 to separate it.

Although described with reference to the preferred embodiment, it will be readily recognized by those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the appended claims. is self-evident

100: enclosure 120; accommodation space
140: outlet 160: expect
180: driving unit 200: first drum
200b: second drum 400: surface removal part
420: blade 440: knife body
610: first separator 620: second separator
640: exhaust space

Claims (1)

It is applied to an electrostatic separator that separates waste plastic materials by electrostatic effect,
a housing into which waste plastics are put;
a first drum having a positive charge and a second drum having a negative charge, which are rotatably mounted on the base inside the housing by a driving unit;
a charge applying unit formed on the first and second drums and applying electric charges to the first and second drums;
A partition wall including a first separator formed under the first drum and a second separator formed under the second drum, passing between the first and second drums, and collecting materials having no charge ;
In the electrostatic separator for manufacturing waste plastic recycling pallets, the electrostatic separator having a discharge space formed between the first separator and the second separator to transport a non-charged plastic material:
The blade is formed to counter the rotational direction of the first and second drums, and has a pointed tip end in contact with the surface of the first and second drums so as to remove the waste plastic adhering to the surface of the first and second drums. and a surface removal unit extending from the blade and including a plate-shaped knife body formed perpendicular to the upper surface of the base.

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