JPH11207743A - Device for removing foreign matter in crushed plastic - Google Patents

Abstract

(57) [Abstract] [Problem] To be mixed with waste plastic crushed into fluff
Fine foreign substances to be attached can be efficiently removed by simple means. SOLUTION: A screen 8 is provided near a lower end of a trough 4 of an inclined screw conveyor for separating and discharging fine foreign matter 10 separated downward from a crushed plastic 9 by a specific gravity difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing foreign matter in crushed plastic used for recycling waste plastic.

[0002]

2. Description of the Related Art The enactment of the Containers and Packaging Recycling Law requires efficient disposal and reuse of plastic waste. In this connection, the general public is obliged to separate and discharge plastic waste, but it is difficult to disseminate 100% of the waste. In practice, collected plastic waste includes ferrous and non-ferrous metals, glass, pottery, and sand. Etc. are mixed.

[0003] For this reason, the foreign substances as described above must be removed beforehand in a stage prior to a facility for recycling waste plastics such as a plastic oil treatment facility.
Efficient removal of foreign substances in the waste plastic pretreatment equipment leads to improvement in reliability in continuous operation of oil processing equipment.

[0004]

When recycling waste plastics, it is common practice to crush them into fluffy shapes. Ferrous and non-ferrous metals, glass, pottery, Contaminants such as sand are removed either by 1) manual separation in front of the crusher or 2) by installing a device such as a vibrating sieve in the back of the crusher to mix and adhere to fluffy waste plastic. We remove pieces.

[0005] However, the method 1) has problems of separation accuracy and great labor cost, and the method 2) requires a special device such as a vibrating sieve to be incorporated in the system of the pretreatment equipment. There is a problem that it leads to an increase in equipment cost.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to enable fine foreign substances mixed and attached to fluff-crushed waste plastic to be efficiently removed by simple means. .

[0007]

In order to solve the above-mentioned problems, the apparatus for removing foreign matter in crushed plastic according to the present invention comprises a conveying device for conveying crushed plastic charged upward into a diagonally disposed trough. A screw is provided, and a screen is provided near the lower end of the trough for separating and discharging foreign matter separated downward from the crushed plastic due to a specific gravity difference.

According to the above-described structure, the crushed plastic to which fine foreign substances such as sand, glass pieces, and pottery pieces are mixed and adhered is transported obliquely upward in the trough by the transport screw. Due to the stirring effect of the transport screw and the specific gravity difference and gravity between the crushed plastic and the foreign matter such as sand, glass pieces, pottery pieces, etc., the foreign matter is gradually separated to the wall side of the trough and slides down along the inner wall surface,
It is separated and discharged on the screen near the lower end. Therefore, there is little tailgating of the crushed plastic when removing foreign matter.

This apparatus is a simple modification in which a screen is arranged on a conventional inclined screw conveyor, and this apparatus is employed as a next feeding means for conveying crushed plastic to a next processing system. In this case, there is no need for a power / device only for removing foreign substances.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a foreign matter removing device 1 is installed in a waste plastic pretreatment facility to remove foreign matter such as sand, glass pieces, and pottery pieces mixed and adhered to waste plastic. The outlet 2 is located downstream of the plastic crusher (not shown), and the outlet 3 is located upstream of the waste plastic resource recycling facility, and also serves as a transport means to the resource recycling facility.

In detail, the foreign matter removing apparatus 1 has an inlet 2 and an outlet 3 formed on the upper side near the lower end and the lower side near the upper end of the bottomed tubular trough 4 which is arranged diagonally. A convey screw 7 having a screw blade 6 attached around a shaft 5 is provided concentrically inside the shaft 5 so as to convey the material to be introduced into the trough 4 obliquely upward. A screen 8 is provided along the circumferential direction of the trough 4 on the lower side of the trough 4 near the lower end of the trough 4 so as to be able to separate fine foreign matters such as sand, glass pieces, and pottery pieces.

The operation of the above configuration will be described. The crushed plastic 9 crushed into a fluff shape is introduced into the trough 4 through the inlet 2, is conveyed obliquely upward by the conveying screw 7, and is supplied to the carry-in section of the resource recycling facility through the outlet 3.

At this time, inside the trough 4, the stirring effect of the conveying screw 7 and the specific gravity between the crushed plastic 9 and the fine foreign matter 10 such as sand, glass fragments, ceramic fragments mixed and adhered thereto. Due to the difference and gravity, the foreign matter 10
Are gradually separated downward on the wall surface side of the trough 4, move downward along the inner wall surface, and are separated and discharged on the screen 8.

Therefore, the crushed plastic 9 is supplied to the resource recycling facility in a state that the crushed plastic 9 hardly contains the foreign matter 10, and the shattered plastic 9 at the location of the screen 8 is small. In addition, since it also serves as a transporting means for transporting to the resource recycling facility, a power / device only for removing foreign matter is not required, and the operating cost and facility cost are reduced.

As shown in FIG. 3, the lower surface 4 of the trough 4
The same effect as described above can be obtained even if the screen 11 is provided below the portion a. The efficiency of removing foreign substances can be increased by installing the above-described foreign substance removing apparatuses 1 in series, for example, in two stages.

Further, the inclination angle of the trough 4 can be adjusted,
Alternatively, the efficiency of removing foreign substances can be further increased by increasing the degree of drying of the crushed plastic that is put into the foreign substance removing apparatus 1.

[0017] The screen may be an aperture capable of separating and discharging the above-mentioned foreign substances, and the trough and the transport screw may be any as long as they can transport diagonally upward without overflowing the input material. However, shapes and types other than those described above can also be used.

[0018]

As described above, the apparatus according to the present invention has a simple modification of disposing a screen in the trough of an inclined screw conveyor, but has the sand and glass pieces mixed and adhered to the crushed plastic. If foreign materials such as pottery pieces can be separated and discharged, and if this device is adopted as the next feeding means of crushed plastic, power and equipment for removing only foreign materials are not necessary, and operation and equipment costs can be reduced. Can be planned.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a schematic overall configuration of an apparatus for removing foreign matter in crushed plastic according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a screen portion of the apparatus for removing foreign matter in crushed plastic shown in FIG.

FIG. 3 is a perspective view showing a screen portion of an apparatus for removing foreign matter in crushed plastic according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 foreign matter removing device 4 trough 7 transport screw 8 screen 9 crushed plastic 10 foreign matter

Claims (1)

[Claims] 1. A transport screw for transporting the input crushed plastic upward is provided inside a diagonally arranged trough, and foreign matter separated downward from the crushed plastic by a specific gravity difference is provided near a lower end of the trough. A device for removing foreign matter in crushed plastic, comprising a screen for separating and discharging.