CN112844830A

CN112844830A - Device for removing metal elements in recycled plastic bottle flakes

Info

Publication number: CN112844830A
Application number: CN202011498781.3A
Authority: CN
Inventors: 王磊
Original assignee: Jieshou Chengming Plastic Co ltd
Current assignee: Jieshou Chengming Plastic Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-05-28

Abstract

The invention belongs to the technical field of regenerated plastics, and particularly relates to a device for removing metal elements in regenerated plastic bottle flakes, which comprises a magnetic separation cylinder, wherein an impurity material bin is sleeved outside the magnetic separation cylinder, a magnetic separation rod is horizontally inserted into a cylinder cavity of the magnetic separation cylinder, and the magnetic separation rod consists of two sections of magnetic separation parts and a connecting part arranged between the two sections of magnetic separation parts and at the overhanging end part; the magnetic separation part is positioned in the cylinder cavity of the magnetic separation cylinder, the connecting part adjacent to the magnetic separation part is positioned in the cavity of the impurity material bin, the magnetic separation part in another section is positioned outside the cylinder cavity of the magnetic separation cylinder, and when the magnetic separation part positioned in the cylinder cavity of the magnetic separation cylinder moves outwards, the magnetic separation part positioned outside the cylinder cavity of the magnetic separation cylinder moves inwards, and the inner side bin wall of the impurity material bin is provided with a scraping sleeve used for scraping impurity fragments adsorbed on the magnetic separation part; the device for removing the metal elements in the regenerated plastic bottle flakes provided by the invention does not need to stop to clean ferromagnetic metal scraps on the magnetic separation rod, so that the magnetic separation efficiency is improved.

Description

Device for removing metal elements in recycled plastic bottle flakes

Technical Field

The invention belongs to the technical field of recycled plastics, and particularly relates to a device for removing metal elements in recycled plastic bottle flakes.

Background

Plastic is one of the great inventions of mankind, but also becomes a source of troublesome garbage because it is difficult to degrade and poses environmental hazards. Actually, the waste plastics are not garbage, and the waste can be changed into valuables through environmental protection treatment. Plastic bottles are a widely used plastic product. In the prior art, Polyester (PET), Polyethylene (PE) and polypropylene (PP) are mostly used as raw materials for plastic bottles, corresponding functional materials are added, and after high-temperature heating, the plastic bottles are subjected to blow molding, extrusion blowing or injection molding through a plastic mold, so that most of waste plastic bottles have great utilization value, for example, the plastic bottles are used as packaging materials, daily necessities, industrial products or household products and the like.

At present, the plastic bottles are generally recycled through manual sorting and then through different recycling procedures according to different materials. The PET bottles are largely used for carbonated beverages such as coca-cola, peperole-cola and sprite, at present, most of the PET bottles are composed of PET bottle bodies and HDPE bottle bottoms, the bottle cap materials are HDPE, the trademark is BOPP thin films, EVA type binders are adopted to adhere to the bottle bodies, ways for recycling the PET bottles include regeneration granulation, alcoholysis and other methods, no matter which method is adopted, the PET bottles are firstly separated from plastic bottles made of other materials, and the PET bottle bodies and the HDPE bottle bottoms are also separated. In the specific recycling process, waste plastic bottles are conveyed to a crusher through a conveyor belt to be crushed, PET bottle pieces are separated by utilizing the difference of density, the separated PET bottle pieces are dried and fed into an extruder to be granulated to obtain granules; for another example, for the recovery of PVC bottles, the PVC bottles are generally cleaned by steam and alkali liquor and trademark is removed, then mechanical and manual sorting is carried out, the sorted PVC bottles are secondarily crushed, and finally, powdery regeneration products with fineness of 500-1200 mu m are obtained, and the purity can reach 99.98%; for another example, for the recovery of PE bottles, HDPE is mainly used as the bottle material, and there are dairy bottles, food bottles, cosmetic bottles, etc. after sorting, the cleaned HDPE bottles are crushed and sorted for subsequent use. That is, the recycling of the existing plastic bottles needs to crush the plastic bottles, although the plastic bottles are cleaned, metals still exist in the plastic bottle pieces, the existence of the metals has a great influence on the screw and the melt filter, and through the disassembly and analysis of the used melt filter, researchers find that a lot of metal debris extruded by the screw is embedded in the outer surface layer of the filter core, a large amount of metal powder is accumulated on the inner layer mesh of the filter core, the metal powder cannot be cleaned in the calcining and cleaning process, the wear of the screw is aggravated due to the existence of the metals, the service lives of the screw and the melt filter are reduced, and further the production cost is increased.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a device for removing metal elements in recycled plastic bottle flakes, which can effectively remove the metal elements in the recycled plastic bottle flakes, prevent the influence on production equipment in the subsequent use and avoid the influence on the quality of recycled plastic products.

In order to achieve the purpose, the invention adopts the following technical scheme:

a device for removing metal elements in regenerated plastic bottle flakes comprises a magnetic separation barrel, wherein an impurity material bin is sleeved outside the magnetic separation barrel, a magnetic separation rod is horizontally inserted into a barrel cavity of the magnetic separation barrel, and the magnetic separation rod consists of two sections of magnetic separation parts and a connecting part arranged between the two sections of magnetic separation parts and at the overhanging end part;

wherein, a festival magnetic separation portion is located the tube chamber of magnetic separation section of thick bamboo, is located rather than adjacent connecting portion in the cavity in impurity material storehouse, another festival the magnetic separation position is in outside the tube chamber of magnetic separation section of thick bamboo, and when the magnetic separation portion that is located magnetic separation section of thick bamboo intracavity outwards removed, be located the magnetic separation portion inwards removed outside the magnetic separation section of thick bamboo chamber, be equipped with on the inboard bulkhead in impurity material storehouse and scrape the cover and be used for striking off the foreign debris that adsorbs in the magnetic separation portion.

In a further technical scheme, the magnetic separation rod comprises a rod-shaped body, wherein a dovetail-shaped clamping strip arranged along the rod length direction is arranged on the upper side of the rod-shaped body, and the part of the upper side of the rod-shaped body, which is transited to the lower side, protrudes outwards along the rod radial direction to form an arc-shaped transition part;

the dovetail-shaped clamping strip and a dovetail-shaped sliding groove formed in the inner side bin wall of the impurity material bin close to the scraping sleeve form guiding and limiting matching.

In a further technical scheme, a material guide part is arranged at the lower end of the impurity material bin, and the guide of the material guide part is in an inclined shape which is far away from the magnetic separation cylinder from top to bottom;

the bottom of the magnetic separation cylinder is arranged to be in an inverted round table shape.

In a further technical scheme, a plurality of magnetic separation rods are arranged at intervals along the height direction of the magnetic separation barrel.

In a further technical scheme, a filter plate which is obliquely arranged is arranged in a cavity of the magnetic separation cylinder on the upper part of the magnetic separation rod, and filter holes are formed in the filter plate and used for plastic bottle flakes to leak down.

Compared with the prior art, the invention has the following technical effects:

according to the removing device for metal elements in the regenerated plastic bottle flakes, the impurity material bin is sleeved on the outer side of the magnetic separation barrel, the magnetic separation rod is horizontally inserted into the barrel cavity of the magnetic separation barrel, ferromagnetic metal clamped in the plastic bottle flakes is adsorbed on the magnetic separation rod when the device is used specifically, after magnetic separation is carried out for a period of time, the magnetic separation part located in the barrel cavity of the magnetic separation barrel moves outwards by pulling the magnetic separation rod, the magnetic separation part located outside the barrel cavity of the magnetic separation barrel moves inwards, and in the moving process, the scraping sleeve arranged on the inner side wall of the impurity material bin scrapes ferromagnetic metal fragments adsorbed on the magnetic separation part to enable the ferromagnetic metal fragments to fall into the impurity material bin. The device for removing the metal elements in the regenerated plastic bottle flakes provided by the invention does not need to stop to clean ferromagnetic metal scraps on the magnetic separation rod, so that the magnetic separation efficiency is improved.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

Fig. 1 is a schematic structural diagram illustrating an apparatus for removing metal elements from recycled plastic bottle flakes according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a magnetic selection lever suitable for use in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a magnetic separator bar suitable for use in FIG. 1;

the reference numbers in the figures illustrate: 10-a magnetic separation cylinder, 11-a filter plate, 111-a filter hole, 20-an impurity material bin, 21-a dovetail-shaped chute, 22-a material guiding part, 30-a magnetic separation rod, 301-a rod-shaped body, 302-a dovetail-shaped clamping strip, 303-an arc transition part, 31-a magnetic separation part, 32-a connecting part and 40-a scraping sleeve.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified by combining the specific drawings.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

When the existing magnetic separation is carried out in a gravity mode, a material to be selected falls from a higher position, contacts a magnetic carrier in a free falling process, and a material containing magnetism is adsorbed to be separated from a plastic bottle piece, but in the subsequent impact process of falling the material to be selected, the magnetic material originally adsorbed on the magnetic carrier is collided and falls off, so that the missing proportion of the magnetic separation is higher; in the prior art, after the magnetic separation mechanism works for a certain time, the magnetic separation operation needs to be suspended, and the magnetic carrier needs to be cleaned, so that the reliability of the magnetic separation is ensured, and the magnetic separation efficiency is influenced.

Therefore, as shown in fig. 1, 2 and 3, the invention provides a device for removing metal elements from recycled plastic bottle flakes, which comprises a magnetic separation cylinder 10, wherein an impurity material bin 20 is sleeved outside the magnetic separation cylinder 10, a magnetic separation rod 30 is horizontally inserted into a cylinder cavity of the magnetic separation cylinder 10, and the magnetic separation rod 30 is composed of two sections of magnetic separation parts 31 and a connecting part 32 arranged between the two sections of magnetic separation parts 31 and at an overhanging end part; wherein, one section magnetic separation portion 31 is located the tube cavity of magnetic separation section of thick bamboo 10, is located rather than adjacent connecting portion 32 in the cavity of impurity material storehouse 20, another section magnetic separation portion 31 is located outside the tube cavity of magnetic separation section of thick bamboo 10, and when the magnetic separation portion 31 that is located the 10 tube cavities of magnetic separation section of thick bamboo intracavity outwards removed, is located the magnetic separation portion 31 inside removal outside the 10 tube cavities of magnetic separation section of thick bamboo, it is used for striking off the foreign matter piece that adsorbs on magnetic separation portion 31 to be equipped with on the inboard bulkhead in impurity material storehouse 20 and scrapes cover 40.

In specific use, treat that the plastic bottle piece of magnetic separation adds from the upper end feed inlet of magnetic separation section of thick bamboo 10, free fall and contact level are to the magnetic separation pole 30 of planting in magnetic separation section of thick bamboo 10 barrel cavitys, the ferromagnetic metal who presss from both sides the storage in the plastic bottle piece can adsorb on magnetic separation pole 30, treat that the magnetic separation carries out a period of back, through taking out magnetic separation pole 30, make the magnetic separation portion 31 that is located magnetic separation section of thick bamboo 10 barrel cavitys outwards remove, the magnetic separation portion 31 that is located magnetic separation section of thick bamboo 10 barrel cavitys outside inwards removes, and at the in-process that should remove, the setting scrapes the ferromagnetic metal piece that cover 40 adsorbs on to magnetic separation portion 31 on the inboard bulkhead in impurity material storehouse 20 and strikes off, make it drop in impurity material storehouse 20. The device for removing the metal elements in the regenerated plastic bottle flakes provided by the invention does not need to stop to clean ferromagnetic metal scraps on the magnetic separation rod 30, so that the magnetic separation efficiency is improved.

It should be noted that the aperture of the through hole formed in the wall of the magnetic separation cylinder 10 is slightly larger than the diameter of the magnetic separation rod 30, so that the magnetic separation rod 30 with the ferromagnetic metal fragments adsorbed thereon can pass through smoothly, and the size of the through hole of the scraping sleeve 40 is matched with the cross-sectional size of the magnetic separation rod 30, so that the ferromagnetic metal fragments adsorbed on the magnetic separation rod 30 can be scraped completely in the process of extracting the magnetic separation rod 30.

According to the invention, in order to avoid the ferromagnetic metal fragments from falling off due to the impact of the subsequent plastic bottle pieces to be magnetically separated, the magnetic separation rod 30 comprises a rod-shaped body 301, a dovetail-shaped clamping strip 302 arranged along the rod length direction of the rod-shaped body 301 is arranged on the upper side of the rod-shaped body 301, and the part of the upper side of the rod-shaped body 301 in transition to the lower side is protruded outwards along the rod radial direction to form an arc-shaped transition part 303; the dovetail-shaped clamping strip 302 and the dovetail-shaped sliding groove 21 formed in the inner side bin wall of the impurity material bin 20 close to the scraping sleeve 40 form guiding and limiting matching.

According to the invention, the lower end of the impurity material bin 20 is provided with a material guiding part 22, and the guiding part 22 is inclined from top to bottom and far away from the magnetic separation cylinder 10; the bottom of the magnetic separation cylinder 10 is arranged to be in an inverted round table shape. Through the structural design, ferromagnetic metal scraps obtained after magnetic separation can be guided to a far position so as to be separated from the plastic bottle area.

According to the invention, in order to ensure the magnetic separation effect, a plurality of magnetic separation rods 30 are arranged at intervals along the height direction of the magnetic separation barrel 10.

According to the invention, in order to remove larger metal materials and impurities contained in plastic bottle flakes to be magnetically separated, a filter plate 11 which is obliquely arranged is arranged in a cavity of the magnetic separation cylinder 10 positioned at the upper part of the magnetic separation rod 30, and filter holes 111 are arranged on the filter plate 11 for the plastic bottle flakes to leak down.

The invention also provides a method for removing metal elements in the recycled plastic bottle flakes, which comprises the steps of sorting and crushing the plastic bottles to obtain plastic bottle flakes;

the plastic bottle pieces are subjected to primary sorting through the metal element removing device;

the plastic bottle flakes after primary separation are separated into plastic bottle flakes with metal elements through a pipeline provided with a metal separator, the plastic bottle flakes are sent into a flour mill to be milled, and then the metal elements and plastic powder are thoroughly separated out through a high-pressure electrostatic separator.

In the invention, the sorting function is to classify the plastic bottles according to the colors of the plastic bottles and reject the plastic bottles obviously filled with metal or sandstone, so that the regenerated plastic bottle pieces can be ensured to have uniform colors, and the use requirements of subsequent manufacturers can be met; and plastic bottles obviously filled with metal or sand and stones are removed, so that the subsequent treatment difficulty can be reduced. As known to those skilled in the art, the sorting can be performed by manual sorting or machine sorting, and the present invention is not described herein.

In the invention, the size of the broken plastic bottle pieces is between 5mm and 15 mm.

Furthermore, according to the invention, the label is usually adhered to the plastic bottle body by using an adhesive, and even if the adhesive is still embedded in the plastic bottle piece obtained by crushing, in order to avoid influencing the subsequent step of removing the metal elements, in the method provided by the invention, the plastic bottle piece obtained by crushing is subjected to water bath cooking to remove the viscosity of the label on the plastic bottle. Furthermore, the temperature of the water bath cooking is 40-60 ℃, and more preferably, a certain amount of sodium carbonate can be added into the cooking liquid. The sodium carbonate has stable property, does not react with plastics, and can improve the buoyancy of the plastic bottle flakes in the cooking liquor, so that part of metal elements in the plastic bottle flakes are settled, and the purpose of primary separation is achieved. More specifically, in the present invention, 50 to 100g of sodium carbonate is contained in 1L of the cooking liquor.

According to the method provided by the invention, the particle size of the non-ferromagnetic metal contained in the plastic bottle flakes is further reduced by a grinding method so as to realize further removal, and preferably, the plastic bottle flakes entering the grinding mill have 20 meshes after being ground.

Further, in the present invention, the operating parameters of the high-voltage electrostatic separator include: the voltage of the corona electrode is 5KV-15KV, and the current is 2-8 mA.

The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The device for removing the metal elements in the regenerated plastic bottle flakes is characterized by comprising a magnetic separation barrel (10), wherein an impurity material bin (20) is sleeved outside the magnetic separation barrel (10), a magnetic separation rod (30) is horizontally inserted into a barrel cavity of the magnetic separation barrel (10), and the magnetic separation rod (30) consists of two sections of magnetic separation parts (31) and a connecting part (32) which is arranged between the two sections of magnetic separation parts (31) and at the overhanging end part;

wherein, one section magnetic separation portion (31) are located the barrel cavity of magnetic separation section of thick bamboo (10), are located rather than adjacent connecting portion (32) in the cavity of impurity material storehouse (20), another section magnetic separation portion (31) are located outside the barrel cavity of magnetic separation section of thick bamboo (10), and when magnetic separation portion (31) that is located magnetic separation section of thick bamboo (10) barrel cavity outwards removed, are located magnetic separation portion (31) the inside removal outside magnetic separation section of thick bamboo (10) barrel cavity, be equipped with on the inboard bulkhead in impurity material storehouse (20) and scrape cover (40) and be used for striking off the impurity piece that adsorbs on magnetic separation portion (31).

2. The device for removing metal elements from recycled plastic bottle flakes according to claim 1, wherein the magnetic separation rod (30) comprises a rod-shaped body (301), a dovetail-shaped clamping strip (302) is arranged on the upper side of the rod-shaped body (301) along the rod length direction of the rod-shaped body, and a part of the transition from the upper side to the lower side of the rod-shaped body (301) protrudes outwards along the rod radial direction to form an arc-shaped transition part (303);

the dovetail-shaped clamping strip (302) and a dovetail-shaped sliding groove (21) formed in the inner side bin wall of the impurity material bin (20) close to the scraping sleeve (40) form guiding and limiting matching.

3. The device for removing the metal elements in the recycled plastic bottle flakes according to claim 1, wherein the lower end of the impurity material bin (20) is provided with a material guiding part (22) which is oriented in an inclined shape away from the magnetic separation cylinder (10) from top to bottom;

the bottom of the magnetic separation cylinder (10) is in an inverted round table shape.

4. The device for removing metal elements from recycled plastic bottle flakes as recited in claim 1, wherein a plurality of magnetic separation rods (30) are arranged at intervals along the height direction of the magnetic separation cylinder (10).

5. The device for removing the metal elements in the recycled plastic bottle flakes according to claim 1, wherein a filter plate (11) is obliquely arranged in the cavity of the magnetic separation cylinder (10) positioned at the upper part of the magnetic separation rod (30), and the filter plate (11) is provided with filter holes (111) for the plastic bottle flakes to leak down.

6. The application of the device for removing metal elements from recycled plastic bottle flakes according to claims 1-5 is characterized in that the plastic bottle flakes to be magnetically separated are fed from the upper end feed inlet of the magnetic separation cylinder 10, fall freely and contact with the magnetic separation rod 30 horizontally inserted into the cylinder cavity of the magnetic separation cylinder 10, ferromagnetic metal sandwiched in the plastic bottle flakes is adsorbed on the magnetic separation rod 30, after the magnetic separation is performed for a period of time, the magnetic separation part 31 located in the cylinder cavity of the magnetic separation cylinder 10 is moved outwards by pulling the magnetic separation rod 30, the magnetic separation part 31 located outside the cylinder cavity of the magnetic separation cylinder 10 is moved inwards, and in the moving process, the scraping sleeve 40 arranged on the inner side wall of the impurity material bin 20 scrapes ferromagnetic metal fragments adsorbed on the magnetic separation part 31 to make the ferromagnetic metal fragments fall into the impurity material bin 20.