Filtering device for recycling PET (Polyethylene Terephthalate) waste materials

Abstract

The utility model relates to a filtering device for recycling PET waste materials, which comprises a shell, a feeding pipe is arranged at the top of the shell, a discharging pipe is arranged at the bottom of the side wall of the shell, a cylinder is arranged in the middle of the inner bottom of the shell, a filtering cavity is formed in an opening of the cylinder, and a blanking opening is formed between the top end of the cylinder and the inner top wall of the shell. The top of the cylinder is further sleeved with a circular ring connected with the interior of the shell, the side wall, below the circular ring, of the cylinder is of a hole-shaped structure, a storage cavity is formed between the part, above the circular ring, of the cylinder and the shell, a backflow pipe connected with the side wall of the cylinder is arranged at the bottom of the storage cavity, and a filter cover located in the storage cavity is buckled to the inlet end of the backflow pipe; a circle of surrounding edge is arranged at the bottom in the cylinder, the bottom end of the side wall of the surrounding edge is turned outwards to form an inclined scraping part, the bottom end of the scraping part abuts against the inner wall of the cylinder, a protruding block is further arranged on the inner side wall of the surrounding edge, and a lead screw driven by a motor is arranged on the protruding block. The device is simple in structure and convenient to use.

Description

Technical Field

[0001] The invention relates to the field of filtering equipment, in particular to a filtering device for recycling PET waste materials. Background Art

[0002] The main sources of waste polyethylene terephthalate (PET) materials are waste generated at various stages in the production process of polyester fibers or filaments, waste fiber products made from polyester fibers or filaments, and waste PET films and PET sheets before or after printing.

[0003] The method steps for decolorizing and recovering waste PET materials to prepare high-purity PET chips are as follows: preparing a PET low-molecular solution--preparing a PET primary solution--filtering, cooling and crystallizing--pressing, dissolving, crystallizing--pressing, dissolving, crystallizing, distilling again--condensation reaction to obtain PET chips. In the above steps, the obtained PET primary solution needs to be added to a filter for filtration to remove impurities, and then an initial solution is obtained. However, the existing filter generally only filters the solution through a filter screen. At this time, the filter screen is prone to be clogged with a large amount of impurities, which in turn affects its filtration work, affecting the filtration effect and efficiency. At the same time, the clogged filter screen will affect the flow rate of the liquid, resulting in pressure build-up in the feed pipe connected to the filter, thereby affecting its safety. Summary of the invention

[0004] The purpose of the present invention is to provide a filtering device for recycling PET waste materials.

[0005] The technical problem of the present invention is mainly solved by the following technical solutions:

[0006] A filtering device for recycling PET waste materials comprises a housing, wherein a feed pipe is arranged at the top of the housing, and a discharge pipe is arranged at the bottom of the side wall thereof:

[0007] A cylinder is arranged in the middle of the bottom of the shell, wherein a filter cavity is formed in the opening of the cylinder, and a material dropping opening is formed between the top of the cylinder and the top wall of the shell, and a ring connected to the inside of the shell is also arranged on the top of the cylinder, wherein the side wall of the cylinder below the ring is a hole-shaped structure, and a storage cavity is formed between the cylinder above the ring and the shell, and a return pipe connected to the side wall of the cylinder is arranged at the bottom of the storage cavity, wherein a filter cover located in the storage cavity is buckled on the inlet end of the return pipe;

[0008] The inner bottom of the cylinder is provided with a circle of surrounding edges, wherein the bottom end of the side wall of the surrounding edges is folded outward to form an inclined scraping portion, and the bottom end of the scraping portion is against the inner wall of the cylinder, and a convex block is also provided on the inner side wall of the surrounding edges, wherein a screw driven by a motor is provided on the convex block;

[0009] The shell is provided with a collecting box, wherein the collecting box is connected to the top of the cylinder through an overflow pipe, and the collecting box is connected to the feeding pipe through a circulation pipe equipped with a water pump.

[0010] Preferably, the connection between the overflow pipe and the cylinder is located below the ring.

[0011] Preferably, a screw hole for a screw rod to pass through is formed on the protrusion, wherein the screw rod is screwed to the screw hole, and a rolling bearing for fixing the screw rod is arranged on the side wall of the housing.

[0012] Preferably, an operating port communicating with the storage cavity is provided at the top of the shell, wherein a switch door for sealing the operating port is provided at the operating port.

[0013] Preferably, the circulation pipe is connected to the feed end of the feed pipe.

[0014] Preferably, a solenoid valve is provided on the reflux pipe.

[0015] Preferably, the bottom end of the feed pipe extends to the lower part of the cylinder opening.

[0016] The beneficial effect of the present invention is that after a period of use, the filter holes on the side wall of the cylinder will cause more impurities to adhere to the inner wall of the cylinder and affect the filtering work. At this time, the motor drives the screw rod to rotate in the screw hole in the protrusion, thereby driving the surrounding edge and the scraping part to move upward on the inner wall of the cylinder, so that the scraping part can scrape off the impurities that may adhere to the inner wall of the cylinder and drive it to move upward together. When the bottom end of the scraping part moves to the bottom end of the blanking opening, the impurities above the scraping part are easy to flow along its inclined surface to the blanking opening and fall into the storage cavity, thereby realizing the cleaning of the impurities that may be deposited in the cylinder, thereby facilitating the subsequent filtering work.

[0017] When the filter holes on the side wall of the cylinder are partially blocked and cannot effectively filter the liquid, when the liquid level rises slowly, it will overflow into the collection box through the overflow pipe for temporary storage, and will not overflow into the storage chamber through the drop opening. At this time, the inner wall of the cylinder needs to be cleaned by the scraping part, and the solution in the collection box can be introduced into the feed pipe through the water pump and the circulation pipe, and then enter the filter chamber for filtration, so as to prevent a large amount of liquid from being introduced into the shell and causing pressure in the feed pipe due to failure to be filtered and discharged in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] In the figure: 1, shell, 2, feed pipe, 3, discharge pipe, 4, cylinder, 5, filter chamber, 6, drop opening, 7, ring, 8, storage chamber, 9, return pipe, 10, filter cover, 11, edge, 12, scraper, 13, bump, 14, screw, 15, motor, 16, collection box, 17, overflow pipe, 18, circulation pipe, 19, water pump, 20, operation port. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0021] A filtering device for recycling PET waste materials comprises a housing 1, wherein a feed pipe 2 is arranged at the top of the housing 1, and a discharge pipe 3 is arranged at the bottom of the side wall thereof:

[0022] A cylinder 4 is arranged at the middle of the bottom of the shell 1, wherein a filter chamber 5 is formed in the opening of the cylinder 4, and a material dropping opening 6 is formed between the top of the cylinder 4 and the inner top wall of the shell 1, and a circular ring 7 connected to the inside of the shell 1 is also arranged on the top of the cylinder 4, wherein the side wall of the cylinder 4 below the circular ring 7 is a hole-shaped structure, and a storage chamber 8 is formed between the cylinder 4 above the circular ring 7 and the shell 1, and a return pipe 9 connected to the side wall of the cylinder 4 is arranged at the bottom of the storage chamber 8, wherein a filter cover 10 located in the storage chamber 8 is buckled on the inlet end of the return pipe 9, and a solenoid valve is arranged on the return pipe 9;

[0023] The inner bottom of the cylinder 4 is provided with a circle of surrounding edge 11, wherein the bottom end of the side wall of the surrounding edge 11 is folded outward to form an inclined scraping portion 12, and the bottom end of the scraping portion 12 abuts against the inner wall of the cylinder 4, and a convex block 13 is also provided on the inner wall of the surrounding edge 11, wherein a screw rod 14 driven by a motor 15 is provided on the convex block 13;

[0024] A collecting box 16 is provided on the shell 1, wherein the collecting box 16 is connected to the top of the cylinder 4 through an overflow pipe 17, and the connection between the overflow pipe 17 and the cylinder 4 is located below the ring 7, and the collecting box 16 is connected to the feed pipe 2 through a circulation pipe 18 equipped with a water pump 19, and the circulation pipe 18 is connected to the feed end of the feed pipe 2.

[0025] In this embodiment, a screw hole for the screw rod 14 to pass through is formed on the protrusion 13 , wherein the screw rod 14 is screwed to the screw hole, and a rolling bearing for fixing the screw rod 14 is disposed on the side wall of the housing 1 .

[0026] like Figure 1 As shown, an operation port 20 communicating with the storage chamber 8 is provided at the top of the housing 1, wherein a switch door for sealing the operation port 20 is provided at the operation port 20.

[0027] In this embodiment, the bottom end of the feed pipe 2 extends to the lower part of the opening of the cylinder 4.

[0028] The working principle of the present invention is as follows: the solution is injected into the cylinder 4 through the feed pipe 2 and filtered through the filter holes on the side wall thereof, wherein the filtered liquid enters the cavity formed between the cylinder 4 and the shell 1 below the ring 7, and is finally discharged through the discharge pipe 3;

[0029] After a period of use, the filter holes on the side wall of the cylinder 4 will have more impurities adhered to the inner wall of the cylinder 4, affecting the filtering work. At this time, the motor 15 drives the screw rod 14 to rotate in the screw hole in the protrusion 13, thereby driving the surrounding edge 11 and the scraping part 12 to move upward on the inner wall of the cylinder 4, so that the scraping part 12 can scrape off the impurities that may be adhered to the inner wall of the cylinder 4 and drive it to move upward together. When the bottom end of the scraping part 12 moves to the bottom end of the blanking opening 6, the impurities above the scraping part 12 are easy to flow along its inclined surface to the blanking opening 6 and fall into the storage chamber 8, thereby realizing the cleaning of the impurities that may be accumulated in the cylinder 4, thereby facilitating the subsequent filtering work;

[0030] A small amount of liquid may enter the storage chamber 8 during the process of cleaning the impurities, then the liquid can be directed back to the filter chamber 5 in the cylinder 4 through the opened reflux pipe 9 for recovery, and at this time, the filter cover 10 can filter the impurities in the storage chamber 8 to prevent the impurities from flowing back into the filter chamber 5 together with the liquid, and finally, the impurities in the storage chamber 8 can be thoroughly cleaned through the opened operation port 20;

[0031] When the filter holes on the side wall of the cylinder 4 are partially blocked and cannot effectively filter the liquid, when the liquid level rises slowly, it will overflow to the collection box 16 through the overflow pipe 17 for temporary storage, and will not overflow into the storage chamber 8 through the drop opening 6. At this time, the inner wall of the cylinder 4 needs to be cleaned by the scraping part 12, and the solution in the collection box 16 can be introduced into the feed pipe 2 through the water pump 19 and the circulation pipe 18, and then enter the filter chamber 5 for filtration, so as to prevent a large amount of liquid from being introduced into the shell 1 and causing the feed pipe 2 to be pressurized because it cannot be filtered and discharged in time.

[0032] The present invention is described in detail above, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A filtering device for recycling PET waste materials, comprising a housing, wherein a feed pipe is arranged at the top of the housing, and a discharge pipe is arranged at the bottom of the side wall, characterized in that: A cylinder is arranged in the middle of the bottom of the shell, wherein a filter cavity is formed in the opening of the cylinder, and a material dropping opening is formed between the top of the cylinder and the top wall of the shell, and a ring connected to the inside of the shell is also arranged on the top of the cylinder, wherein the side wall of the cylinder below the ring is a hole-shaped structure, and a storage cavity is formed between the cylinder above the ring and the shell, and a return pipe connected to the side wall of the cylinder is arranged at the bottom of the storage cavity, wherein a filter cover located in the storage cavity is buckled on the inlet end of the return pipe; The inner bottom of the cylinder is provided with a circle of surrounding edges, wherein the bottom end of the side wall of the surrounding edges is folded outward to form an inclined scraping portion, and the bottom end of the scraping portion is against the inner wall of the cylinder, and a convex block is also provided on the inner side wall of the surrounding edges, wherein a screw driven by a motor is provided on the convex block; The shell is provided with a collecting box, wherein the collecting box is connected to the top of the cylinder through an overflow pipe, and the collecting box is connected to the feeding pipe through a circulation pipe equipped with a water pump.

2. The filtering device for recycling PET waste materials according to claim 1, characterized in that: The connection between the overflow pipe and the cylinder is located below the ring.

3. The filtering device for recycling PET waste materials according to claim 1, characterized in that: The convex block is provided with a screw hole for the screw rod to pass through, wherein the screw rod is screwed to the screw hole, and a rolling bearing for fixing the screw rod is arranged on the side wall of the shell.

4. The filtering device for recycling PET waste materials according to claim 1, characterized in that: The top of the shell is provided with an operation port communicating with the storage cavity, wherein a switch door for sealing the operation port is provided at the operation port.

5. The filtering device for recycling PET waste materials according to claim 1, characterized in that: The circulation pipe is connected to the feeding end of the feeding pipe.

6. The filtering device for recycling PET waste materials according to claim 1, characterized in that: The reflux pipe is provided with a solenoid valve.

7. The filtering device for recycling PET waste materials according to claim 1, characterized in that: The bottom end of the feed pipe extends to the lower part of the cylinder opening.

Images